Dépouillements

Sub-populations and patterns in blast induced fine fragmentation / Simon P. Michaux in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 576–586 Titre : Sub-populations and patterns in blast induced fine fragmentation Type de document : texte imprimé Auteurs : Simon P. Michaux, Auteur Année de publication : 2009 Article en page(s) : pp. 576–586 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Surface  area  Applied  energy  Self-similar  Sub-populations  Fractal  Particle  shape Résumé : The understanding of fundamental mechanisms of fragmentation is still being developed. As such the fine fragmentation produced in a blast has been the subject to study. By examining the fines in the context of surface area instead of mass, several patterns and sub-populations have been observed. This paper is a study of fine fragmentation generated in small scale blasts. Each size distribution was transformed from mass into surface area. Each explosive charge was simulated in context of the energy it applied to the sample during breakage. This paper represents a small part of a larger study. The samples blasted in this study produced several aspects of self-similarity in breakage. Samples of the same rock type produced a similar surface area size distribution that was observed at a wide range of applied explosive energies. Each rock type had a characteristic surface area size distribution. Shape characteristics of measured fragments in the √2 sieve series shared similarities across a wide range of size fractions. Also paradoxically, the products of fine fragmentation were found to be multi-component in nature. A change in surface area size distribution was observed at 1 mm, which was found to be statistically significant. The fractal dimension of particles larger than 1 mm were found to be statistically different to particles smaller than 1 mm. Another change in particle character was found at 10 mm fragment size. The generation of fine fragmentation characterisation paradoxically has two fragment size thresholds of note, 10 mm and 1 mm, and is self-similar in nature. It is postulated that fragmentation is not a true fractal but the individual fundamental mechanisms that generate it may well be. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001101 [article] Sub-populations and patterns in blast induced fine fragmentation [texte imprimé] / Simon P. Michaux, Auteur . - 2009 . - pp. 576–586. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 576–586 Mots-clés : Surface  area  Applied  energy  Self-similar  Sub-populations  Fractal  Particle  shape Résumé : The understanding of fundamental mechanisms of fragmentation is still being developed. As such the fine fragmentation produced in a blast has been the subject to study. By examining the fines in the context of surface area instead of mass, several patterns and sub-populations have been observed. This paper is a study of fine fragmentation generated in small scale blasts. Each size distribution was transformed from mass into surface area. Each explosive charge was simulated in context of the energy it applied to the sample during breakage. This paper represents a small part of a larger study. The samples blasted in this study produced several aspects of self-similarity in breakage. Samples of the same rock type produced a similar surface area size distribution that was observed at a wide range of applied explosive energies. Each rock type had a characteristic surface area size distribution. Shape characteristics of measured fragments in the √2 sieve series shared similarities across a wide range of size fractions. Also paradoxically, the products of fine fragmentation were found to be multi-component in nature. A change in surface area size distribution was observed at 1 mm, which was found to be statistically significant. The fractal dimension of particles larger than 1 mm were found to be statistically different to particles smaller than 1 mm. Another change in particle character was found at 10 mm fragment size. The generation of fine fragmentation characterisation paradoxically has two fragment size thresholds of note, 10 mm and 1 mm, and is self-similar in nature. It is postulated that fragmentation is not a true fractal but the individual fundamental mechanisms that generate it may well be. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001101

Surface area production during grinding / Elias Stamboliadis in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 587–592 Titre : Surface area production during grinding Type de document : texte imprimé Auteurs : Elias Stamboliadis, Auteur ; Olga Pantelaki, Auteur ; Evangelos Petrakis, Auteur Année de publication : 2009 Article en page(s) : pp. 587–592 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Grinding  Size  analysis  Specific  surface  area Résumé : During grinding, in cascading mills, the mass distribution of the material moves continuously to finer sizes. Grinding models are usually designed to predict the size distribution of the mill products either as a function of effective breakage events and the time or the energy consumed by the mill. Mill products are always tested for their size analysis and their fineness is usually expressed as the size d through which a certain amount of material passes, i.e. d80. However, particulate materials have some supplementary properties that a grinding model should predict as well. The specific surface area is such an important supplementary property. Initially, the present work examines the relationship between mass distribution and the surface area of ground materials and determines the conditions under which, mass distribution can be used to determine the surface area. Based on these findings the work further examines the operating conditions of a cascading mill under which the surface area of the material increases at the highest rate. The operating parameter examined is the mill load ratio expressed as the mass ratio of mill grinding media and the material present in the mill. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750800277X [article] Surface area production during grinding [texte imprimé] / Elias Stamboliadis, Auteur ; Olga Pantelaki, Auteur ; Evangelos Petrakis, Auteur . - 2009 . - pp. 587–592. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 587–592 Mots-clés : Comminution  Grinding  Size  analysis  Specific  surface  area Résumé : During grinding, in cascading mills, the mass distribution of the material moves continuously to finer sizes. Grinding models are usually designed to predict the size distribution of the mill products either as a function of effective breakage events and the time or the energy consumed by the mill. Mill products are always tested for their size analysis and their fineness is usually expressed as the size d through which a certain amount of material passes, i.e. d80. However, particulate materials have some supplementary properties that a grinding model should predict as well. The specific surface area is such an important supplementary property. Initially, the present work examines the relationship between mass distribution and the surface area of ground materials and determines the conditions under which, mass distribution can be used to determine the surface area. Based on these findings the work further examines the operating conditions of a cascading mill under which the surface area of the material increases at the highest rate. The operating parameter examined is the mill load ratio expressed as the mass ratio of mill grinding media and the material present in the mill. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750800277X

A more sustainable approach to assessing comminution efficiency / Fiesal Musa in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 593–601 Titre : A more sustainable approach to assessing comminution efficiency Type de document : texte imprimé Auteurs : Fiesal Musa, Auteur ; Rob Morrison, Auteur Année de publication : 2009 Article en page(s) : pp. 593–601 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mineral  processing  Comminution  Crushing  Grinding Résumé : The Bond operating work index is in common use for assessment of comminution efficiency. This method was developed for rod and grinding ball mill circuits and is not well suited to AG/SAG mills or the wide range of comminution devices now in common use. Traditional measures of efficiency only consider the net motor power of the drive unit. However, ancillary processes such as materials handling and classification can consume a substantial fraction of motor power. Wear resistant liners and grinding media are also consumed by the comminution process. These consumables themselves require substantial energy to mine, refine and to manufacture. This embedded (or indirect) energy can be of similar order to motor power. This paper outlines several ways to estimate of comminution efficiency. These methods can be applied to a wide range of equipment. The paper also describes how to estimate indirect energy consumption. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001095 [article] A more sustainable approach to assessing comminution efficiency [texte imprimé] / Fiesal Musa, Auteur ; Rob Morrison, Auteur . - 2009 . - pp. 593–601. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 593–601 Mots-clés : Mineral  processing  Comminution  Crushing  Grinding Résumé : The Bond operating work index is in common use for assessment of comminution efficiency. This method was developed for rod and grinding ball mill circuits and is not well suited to AG/SAG mills or the wide range of comminution devices now in common use. Traditional measures of efficiency only consider the net motor power of the drive unit. However, ancillary processes such as materials handling and classification can consume a substantial fraction of motor power. Wear resistant liners and grinding media are also consumed by the comminution process. These consumables themselves require substantial energy to mine, refine and to manufacture. This embedded (or indirect) energy can be of similar order to motor power. This paper outlines several ways to estimate of comminution efficiency. These methods can be applied to a wide range of equipment. The paper also describes how to estimate indirect energy consumption. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001095

Development of a rapid particle breakage characterisation device / Fengnian Shi in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 602–612 Titre : Development of a rapid particle breakage characterisation device : The JKRBT Type de document : texte imprimé Auteurs : Fengnian Shi, Auteur ; Toni Kojovic, Auteur ; Stephen Larbi-Bram, Auteur Année de publication : 2009 Article en page(s) : pp. 602–612 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Modelling Résumé : Ore breakage characterisation plays an essential role in the design and optimization of comminution circuits. Recently, the JKMRC comminution research team has developed a Rotary Breakage Tester (JKRBT) for rapid particle breakage characterisation tests. The JKRBT uses a rotor–stator impacting system, in which particles gain a controlled kinetic energy while they are spun in the rotor and are then ejected and impacted against the stator, causing particle breakage. The first industrialised JKRBT was installed at Anglo Research in Johannesburg in March 2007, and six more JKRBTs were deployed in 2008 around the world. This paper discusses the major design and calibration issues encountered in the JKRBT development and findings from detailed experimental studies. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001204 [article] Development of a rapid particle breakage characterisation device : The JKRBT [texte imprimé] / Fengnian Shi, Auteur ; Toni Kojovic, Auteur ; Stephen Larbi-Bram, Auteur . - 2009 . - pp. 602–612. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 602–612 Mots-clés : Comminution  Modelling Résumé : Ore breakage characterisation plays an essential role in the design and optimization of comminution circuits. Recently, the JKMRC comminution research team has developed a Rotary Breakage Tester (JKRBT) for rapid particle breakage characterisation tests. The JKRBT uses a rotor–stator impacting system, in which particles gain a controlled kinetic energy while they are spun in the rotor and are then ejected and impacted against the stator, causing particle breakage. The first industrialised JKRBT was installed at Anglo Research in Johannesburg in March 2007, and six more JKRBTs were deployed in 2008 around the world. This paper discusses the major design and calibration issues encountered in the JKRBT development and findings from detailed experimental studies. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001204

New developments in cone crusher performance optimization / Jens Lichter in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 613–617 Titre : New developments in cone crusher performance optimization Type de document : texte imprimé Auteurs : Jens Lichter, Auteur ; King Lim, Auteur ; Alex Potapov, Auteur Année de publication : 2009 Article en page(s) : pp. 613–617 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Crushing  DEM  Process  optimization Résumé : This paper shall review Metso Minerals’ current 3D Discrete Element Method (DEM) modeling techniques, developed to allow a detailed study of the interactions of crushing design variables with actual rock mechanics. A standard DEM approach cannot be applied to systems where size reduction is an important element in the flow of particles, such as industrial crushers. In these systems, it is necessary to physically decrease the particle sizes in a realistic way, as they are transported through the device. Metso Minerals has therefore developed a breakage model that incorporates elements of Population Balance Modeling (PBM) techniques to describe breakage as a function of the loads on the individual rocks. The combination of this breakage model with DEM has therefore allowed the development of a multi physics based comminution model that can be applied to crusher development. This model is sensitive to all aspects of crusher design including crusher machine parameters and the ore characteristics. This physics based virtual comminution model will enable engineers to optimize the design development of future crushers by allowing a wider range of values for the crusher variables to be investigated in a rapid, yet more detailed manner, without the need for the traditional expensive and lengthy prototype testing. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001083 [article] New developments in cone crusher performance optimization [texte imprimé] / Jens Lichter, Auteur ; King Lim, Auteur ; Alex Potapov, Auteur . - 2009 . - pp. 613–617. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 613–617 Mots-clés : Comminution  Crushing  DEM  Process  optimization Résumé : This paper shall review Metso Minerals’ current 3D Discrete Element Method (DEM) modeling techniques, developed to allow a detailed study of the interactions of crushing design variables with actual rock mechanics. A standard DEM approach cannot be applied to systems where size reduction is an important element in the flow of particles, such as industrial crushers. In these systems, it is necessary to physically decrease the particle sizes in a realistic way, as they are transported through the device. Metso Minerals has therefore developed a breakage model that incorporates elements of Population Balance Modeling (PBM) techniques to describe breakage as a function of the loads on the individual rocks. The combination of this breakage model with DEM has therefore allowed the development of a multi physics based comminution model that can be applied to crusher development. This model is sensitive to all aspects of crusher design including crusher machine parameters and the ore characteristics. This physics based virtual comminution model will enable engineers to optimize the design development of future crushers by allowing a wider range of values for the crusher variables to be investigated in a rapid, yet more detailed manner, without the need for the traditional expensive and lengthy prototype testing. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001083

Improving yield and shape in a crushing plant / Magnus Bengtsson in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 618–624 Titre : Improving yield and shape in a crushing plant Type de document : texte imprimé Auteurs : Magnus Bengtsson, Auteur ; Per Svedensten, Auteur ; C. Magnus Evertsson, Auteur Année de publication : 2009 Article en page(s) : pp. 618–624 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Modelling  Crushing  Simulation  Particle  size Résumé : There is increasing demand to optimise yield and increase capacity of crushing plants. Research in this area has resulted in the development of numerous optimisation tools, and resent research has shown that the economic aspects of production have great influence on the optimisation results. The profitability of a product is influenced by several parameters, and control of all these parameters is necessary to use some sort of optimisation software. In this paper, we present a case study of a typical crushing plant, with the goal of reducing the number of crusher while keeping the plant capacity and quality. By reducing the number of crusher the plant will need less maintenance which will decrease the operating costs. The article presents a method to combine crushing plant simulation and optimisation with quality and economic considerations in order to successfully study alternative configurations of the plant. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000454 [article] Improving yield and shape in a crushing plant [texte imprimé] / Magnus Bengtsson, Auteur ; Per Svedensten, Auteur ; C. Magnus Evertsson, Auteur . - 2009 . - pp. 618–624. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 618–624 Mots-clés : Modelling  Crushing  Simulation  Particle  size Résumé : There is increasing demand to optimise yield and increase capacity of crushing plants. Research in this area has resulted in the development of numerous optimisation tools, and resent research has shown that the economic aspects of production have great influence on the optimisation results. The profitability of a product is influenced by several parameters, and control of all these parameters is necessary to use some sort of optimisation software. In this paper, we present a case study of a typical crushing plant, with the goal of reducing the number of crusher while keeping the plant capacity and quality. By reducing the number of crusher the plant will need less maintenance which will decrease the operating costs. The article presents a method to combine crushing plant simulation and optimisation with quality and economic considerations in order to successfully study alternative configurations of the plant. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000454

Applying grindcurves to mill operation and optimisation / M.S. Powell in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 625–632 Titre : Applying grindcurves to mill operation and optimisation Type de document : texte imprimé Auteurs : M.S. Powell, Auteur ; A.P. Van Der Westhuizen, Auteur ; A.N. Mainza, Auteur Année de publication : 2009 Article en page(s) : pp. 625–632 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Grinding  SAG  milling  Process  control Résumé : The operation of AG/SAG mills is sensitive to mill filling, therefore developing grindcurves to relate mill filling to performance indicators such as throughput, power draw, and product size can assist in achieving optimal mill operations. The throughput, power draw, and product size have been shown to peak at different mill filling levels. Establishing grindcurves can assist operators to decide on the best set point for operating their mill. Factors such as mill speed, mill inlet water, feed size distribution, and ore hardness all have an influence on the grindcurve, and form an integral part of the optimisation process. Test work has been conducted at a number of sites to develop grindcurves for different mills treating a range of ores. The results show great promise for use in optimising the operating set points for use in mill control. The methodology for developing grindcurves is described and the results from the case studies performed on fixed and variable speed mills are discussed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000053 [article] Applying grindcurves to mill operation and optimisation [texte imprimé] / M.S. Powell, Auteur ; A.P. Van Der Westhuizen, Auteur ; A.N. Mainza, Auteur . - 2009 . - pp. 625–632. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 625–632 Mots-clés : Comminution  Grinding  SAG  milling  Process  control Résumé : The operation of AG/SAG mills is sensitive to mill filling, therefore developing grindcurves to relate mill filling to performance indicators such as throughput, power draw, and product size can assist in achieving optimal mill operations. The throughput, power draw, and product size have been shown to peak at different mill filling levels. Establishing grindcurves can assist operators to decide on the best set point for operating their mill. Factors such as mill speed, mill inlet water, feed size distribution, and ore hardness all have an influence on the grindcurve, and form an integral part of the optimisation process. Test work has been conducted at a number of sites to develop grindcurves for different mills treating a range of ores. The results show great promise for use in optimising the operating set points for use in mill control. The methodology for developing grindcurves is described and the results from the case studies performed on fixed and variable speed mills are discussed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000053

The application of a simplified approach to modelling tumbling mills, stirred media mills and HPGR’s / A.L. Hinde in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 633–641 Titre : The application of a simplified approach to modelling tumbling mills, stirred media mills and HPGR’s Type de document : texte imprimé Auteurs : A.L. Hinde, Auteur ; J.T. Kalala, Auteur Année de publication : 2009 Article en page(s) : pp. 633–641 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Modelling  Simulation  Process  optimisation  Process  synthesis Résumé : Most modern population balance models for comminution invoke the concept of a specific breakage rate function and a breakage distribution function to describe breakage kinetics. One of the difficulties of this approach is that these functions are very difficult to measure directly. Consequently, it is usual to assume that these functions can be represented by simple equations with parameters that can easily be estimated from test data using back-calculation techniques. However, these estimates can be very sensitive to small measurement errors and are usually subject to very large variances. This paper presents a simplified approach to modelling comminution processes that invoke the concept of an energy-based cumulative breakage rate function to describe breakage kinetics. This function can be estimated directly from plant data and is well-suited to multi-component modelling of individual rock types and mineral species. Examples of the application of this simplified modelling approach are described for the treatment of platinum ores using ball mills, AG/SAG mills, HPGR’s and stirred media mills. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001071 [article] The application of a simplified approach to modelling tumbling mills, stirred media mills and HPGR’s [texte imprimé] / A.L. Hinde, Auteur ; J.T. Kalala, Auteur . - 2009 . - pp. 633–641. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 633–641 Mots-clés : Comminution  Modelling  Simulation  Process  optimisation  Process  synthesis Résumé : Most modern population balance models for comminution invoke the concept of a specific breakage rate function and a breakage distribution function to describe breakage kinetics. One of the difficulties of this approach is that these functions are very difficult to measure directly. Consequently, it is usual to assume that these functions can be represented by simple equations with parameters that can easily be estimated from test data using back-calculation techniques. However, these estimates can be very sensitive to small measurement errors and are usually subject to very large variances. This paper presents a simplified approach to modelling comminution processes that invoke the concept of an energy-based cumulative breakage rate function to describe breakage kinetics. This function can be estimated directly from plant data and is well-suited to multi-component modelling of individual rock types and mineral species. Examples of the application of this simplified modelling approach are described for the treatment of platinum ores using ball mills, AG/SAG mills, HPGR’s and stirred media mills. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001071

Modeling the contribution of specific grinding pressure for the calculation of HPGR product size distribution / Claudio L. Schneider in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 642–649 Titre : Modeling the contribution of specific grinding pressure for the calculation of HPGR product size distribution Type de document : texte imprimé Auteurs : Claudio L. Schneider, Auteur ; Vladmir K. Alves, Auteur ; Leonard G. Austin, Auteur Année de publication : 2009 Article en page(s) : pp. 642–649 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Simulation  Modeling  Comminution  Iron  ores  HPGR Résumé : Vale, one of the largest mining companies in the world, has prioritized the development of HPGR technology for practical application in its current projects. An existing model for the HPGR, capable of predicting product size distributions, has been evaluated under distinct grinding conditions for one feed material. The effect of grinding pressure and feed size distribution were investigated. The model response showed a clear dependency of product size distribution with specific grinding pressure. As a result, specific grinding pressure was incorporated into the model, allowing for predicting product size distribution at practical values of this important process parameter. Based on this result, a characterization procedure was envisaged so as to produce parameters for the model. The procedure does not require complex experimental procedures, and all of the testing can be carried out in an expedited form in an instrumented bench-scale HPGR, using small samples of about 10 kg. The only analyses required are size distributions. The model was implemented in the Modsim™ plant-wide simulator, with facilities to predict product size distribution for any roll diameter, length and speed of an HPGR machine. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000727 [article] Modeling the contribution of specific grinding pressure for the calculation of HPGR product size distribution [texte imprimé] / Claudio L. Schneider, Auteur ; Vladmir K. Alves, Auteur ; Leonard G. Austin, Auteur . - 2009 . - pp. 642–649. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 642–649 Mots-clés : Simulation  Modeling  Comminution  Iron  ores  HPGR Résumé : Vale, one of the largest mining companies in the world, has prioritized the development of HPGR technology for practical application in its current projects. An existing model for the HPGR, capable of predicting product size distributions, has been evaluated under distinct grinding conditions for one feed material. The effect of grinding pressure and feed size distribution were investigated. The model response showed a clear dependency of product size distribution with specific grinding pressure. As a result, specific grinding pressure was incorporated into the model, allowing for predicting product size distribution at practical values of this important process parameter. Based on this result, a characterization procedure was envisaged so as to produce parameters for the model. The procedure does not require complex experimental procedures, and all of the testing can be carried out in an expedited form in an instrumented bench-scale HPGR, using small samples of about 10 kg. The only analyses required are size distributions. The model was implemented in the Modsim™ plant-wide simulator, with facilities to predict product size distribution for any roll diameter, length and speed of an HPGR machine. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000727

Modeling breakage rates of coarse particles in ball mills / Luís Marcelo Tavares in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 650–659 Titre : Modeling breakage rates of coarse particles in ball mills Type de document : texte imprimé Auteurs : Luís Marcelo Tavares, Auteur ; Rodrigo M. De Carvalho, Auteur Année de publication : 2009 Article en page(s) : pp. 650–659 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Ball  mill  Modeling  Particle  breakage Résumé : Breakage rates of coarse particles in ball mills generally follow non-first-order kinetics and the distribution products from batch milling are often characterized by significant contributions of abrasion besides breakage by impact, which are not well described using traditional size–mass balance formulations. Under such conditions, particles are often subject to impacts of insufficient magnitude to produce breakage in each stressing event, so that they are broken by a combination of abrasion and impact and also particles undergo weakening due to unsuccessful stressing events. The paper presents a mathematical model of batch grinding which takes into account the distribution of stressing energies in the mill, the distribution of fracture energies of particles contained in the charge, describing breakage by impacts from grinding media producing catastrophic breakage, abrasion and weakening from repeated impacts. The model has been applied to describe the rate of disappearance of two materials in batch grinding with good results. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000971 [article] Modeling breakage rates of coarse particles in ball mills [texte imprimé] / Luís Marcelo Tavares, Auteur ; Rodrigo M. De Carvalho, Auteur . - 2009 . - pp. 650–659. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 650–659 Mots-clés : Ball  mill  Modeling  Particle  breakage Résumé : Breakage rates of coarse particles in ball mills generally follow non-first-order kinetics and the distribution products from batch milling are often characterized by significant contributions of abrasion besides breakage by impact, which are not well described using traditional size–mass balance formulations. Under such conditions, particles are often subject to impacts of insufficient magnitude to produce breakage in each stressing event, so that they are broken by a combination of abrasion and impact and also particles undergo weakening due to unsuccessful stressing events. The paper presents a mathematical model of batch grinding which takes into account the distribution of stressing energies in the mill, the distribution of fracture energies of particles contained in the charge, describing breakage by impacts from grinding media producing catastrophic breakage, abrasion and weakening from repeated impacts. The model has been applied to describe the rate of disappearance of two materials in batch grinding with good results. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000971

The effect of ball size on breakage rate parameter in a pilot scale ball mill / A. Seyfi Erdem in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 660–664 Titre : The effect of ball size on breakage rate parameter in a pilot scale ball mill Type de document : texte imprimé Auteurs : A. Seyfi Erdem, Auteur ; Ş. Levent Ergün, Auteur Année de publication : 2009 Article en page(s) : pp. 660–664 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Grinding  Ball  mill  Ball  size  Modelling  Simulation Résumé : The objective of this study is to investigate the effect of ball size on grinding kinetics in a pilot scale ball mill. Six different ball media gradings were tested. Comparative tests were conducted in batch ball mill having 1.2 m diameter and 0.6 m length at constant operating condition of mill such as media mass, mill speed and input specific energy. Feed samples were ground batchwise and representative sample was taken from inside the mill for each determined grinding period. Grinding process in ball mill was modeled and the specific rate of breakage was calculated for the each test. The results indicated that the relationship between different breakage rate and particle size has a maximum for each ball size distribution. Consequently, a new equation to correlate maximum ball size and particle size at maximum breakage occurs is proposed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000314 [article] The effect of ball size on breakage rate parameter in a pilot scale ball mill [texte imprimé] / A. Seyfi Erdem, Auteur ; Ş. Levent Ergün, Auteur . - 2009 . - pp. 660–664. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 660–664 Mots-clés : Grinding  Ball  mill  Ball  size  Modelling  Simulation Résumé : The objective of this study is to investigate the effect of ball size on grinding kinetics in a pilot scale ball mill. Six different ball media gradings were tested. Comparative tests were conducted in batch ball mill having 1.2 m diameter and 0.6 m length at constant operating condition of mill such as media mass, mill speed and input specific energy. Feed samples were ground batchwise and representative sample was taken from inside the mill for each determined grinding period. Grinding process in ball mill was modeled and the specific rate of breakage was calculated for the each test. The results indicated that the relationship between different breakage rate and particle size has a maximum for each ball size distribution. Consequently, a new equation to correlate maximum ball size and particle size at maximum breakage occurs is proposed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000314

Using DEM to compare the energy efficiency of pilot scale ball and tower mills / Rob D. Morrison in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 665–672 Titre : Using DEM to compare the energy efficiency of pilot scale ball and tower mills Type de document : texte imprimé Auteurs : Rob D. Morrison, Auteur ; Paul W. Cleary, Auteur ; Matthew D. Sinnott, Auteur Année de publication : 2009 Article en page(s) : pp. 665–672 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Grinding  and  fine  particle  processing Résumé : Tower mills are considered to be appreciably more energy efficient than ball mills. Why this should be so is a question which can be explored by using DEM to simulate one machine of each type with similar breakage capabilities. This paper reports on a comparison between a pilot scale tower mill and a small ball mill in terms of the power required to produce reasonably similar distributions of normal and tangential impacts. While the tower mill produces quite a narrow spectrum of normal energies, the ball mill produces a wide distribution. Hence, the ball mill can be expected to be much more “forgiving” of variable feed conditions but much less efficient in terms of utilization of the energy from media interactions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000302 [article] Using DEM to compare the energy efficiency of pilot scale ball and tower mills [texte imprimé] / Rob D. Morrison, Auteur ; Paul W. Cleary, Auteur ; Matthew D. Sinnott, Auteur . - 2009 . - pp. 665–672. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 665–672 Mots-clés : Comminution  Grinding  and  fine  particle  processing Résumé : Tower mills are considered to be appreciably more energy efficient than ball mills. Why this should be so is a question which can be explored by using DEM to simulate one machine of each type with similar breakage capabilities. This paper reports on a comparison between a pilot scale tower mill and a small ball mill in terms of the power required to produce reasonably similar distributions of normal and tangential impacts. While the tower mill produces quite a narrow spectrum of normal energies, the ball mill produces a wide distribution. Hence, the ball mill can be expected to be much more “forgiving” of variable feed conditions but much less efficient in terms of utilization of the energy from media interactions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000302

Comparison of energy efficiency between ball mills and stirred mills in coarse grinding / Fengnian Shi in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 673–680 Titre : Comparison of energy efficiency between ball mills and stirred mills in coarse grinding Type de document : texte imprimé Auteurs : Fengnian Shi, Auteur ; Rob Morrison, Auteur ; Andrew Cervellin, Auteur Année de publication : 2009 Article en page(s) : pp. 673–680 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Grinding Résumé : Stirred mills are primarily used for fine and ultra-fine grinding. They dominate these grinding applications because greater stress intensity can be delivered in stirred mills and they can achieve better energy efficiency than ball mills in fine and ultra-fine grinding. Investigations were conducted on whether the greater performance of stirred mills over ball mills in fine grinding can be extended to coarse grinding applications. Four different laboratory ball mills and stirred mills have been tested to grind seven ore samples with feed sizes ranging from 3.35 mm to 150 μm. A case study on full scale operations of a 2.6 MW IsaMill replacing the existing 4 MW regrind ball mill at Kumtor Gold Mine in Kyrgyzstan is also included. This paper summarizes the major findings from these investigations. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002823 [article] Comparison of energy efficiency between ball mills and stirred mills in coarse grinding [texte imprimé] / Fengnian Shi, Auteur ; Rob Morrison, Auteur ; Andrew Cervellin, Auteur . - 2009 . - pp. 673–680. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 673–680 Mots-clés : Comminution  Grinding Résumé : Stirred mills are primarily used for fine and ultra-fine grinding. They dominate these grinding applications because greater stress intensity can be delivered in stirred mills and they can achieve better energy efficiency than ball mills in fine and ultra-fine grinding. Investigations were conducted on whether the greater performance of stirred mills over ball mills in fine grinding can be extended to coarse grinding applications. Four different laboratory ball mills and stirred mills have been tested to grind seven ore samples with feed sizes ranging from 3.35 mm to 150 μm. A case study on full scale operations of a 2.6 MW IsaMill replacing the existing 4 MW regrind ball mill at Kumtor Gold Mine in Kyrgyzstan is also included. This paper summarizes the major findings from these investigations. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002823

Fine milling in applied mechanochemistry / Peter Baláž in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 681–694 Titre : Fine milling in applied mechanochemistry Type de document : texte imprimé Auteurs : Peter Baláž, Auteur ; Erika Dutková, Auteur Année de publication : 2009 Article en page(s) : pp. 681–694 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Fine  milling  Mechanochemistry  Extractive  metallurgy  Crystal  engineering  Materials  engineering  Coal  industry  Building  industry  Agriculture  Pharmacy  Waste Résumé : This review paper is devoted to application of mechanochemistry in extractive metallurgy, crystal engineering, materials engineering, coal industry, building industry, agriculture, pharmacy and waste treatment. In extractive metallurgy the most commercially attractive potential applications using fine milling (Activox, Melt) will be illustrated. Mechanochemical approach in crystal and materials engineering will focus on the non-equilibrium processing of materials and their current and potential applications. In agriculture the technological advantages of mechanochemical methods over traditional methods for improving the solubility of natural phosphates will be documented. In pharmacy, the selected examples of fine milling application will show the improved bioavailability of drugs. The examples of fine milling utilization in coal industry, building industry and waste treatment are also given. Simplification of the processes, ecological safety and the product extraordinariness characterize the application of fine milling in mechanochemistry. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000326 [article] Fine milling in applied mechanochemistry [texte imprimé] / Peter Baláž, Auteur ; Erika Dutková, Auteur . - 2009 . - pp. 681–694. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 681–694 Mots-clés : Fine  milling  Mechanochemistry  Extractive  metallurgy  Crystal  engineering  Materials  engineering  Coal  industry  Building  industry  Agriculture  Pharmacy  Waste Résumé : This review paper is devoted to application of mechanochemistry in extractive metallurgy, crystal engineering, materials engineering, coal industry, building industry, agriculture, pharmacy and waste treatment. In extractive metallurgy the most commercially attractive potential applications using fine milling (Activox, Melt) will be illustrated. Mechanochemical approach in crystal and materials engineering will focus on the non-equilibrium processing of materials and their current and potential applications. In agriculture the technological advantages of mechanochemical methods over traditional methods for improving the solubility of natural phosphates will be documented. In pharmacy, the selected examples of fine milling application will show the improved bioavailability of drugs. The examples of fine milling utilization in coal industry, building industry and waste treatment are also given. Simplification of the processes, ecological safety and the product extraordinariness characterize the application of fine milling in mechanochemistry. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000326

Value adding limestone to filler grade through an ultra-fine grinding process in jet mill for use in plastic industries / Samayamutthirian Palaniandy in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 695–703 Titre : Value adding limestone to filler grade through an ultra-fine grinding process in jet mill for use in plastic industries Type de document : texte imprimé Auteurs : Samayamutthirian Palaniandy, Auteur ; Nurdina Abd Kadir, Auteur ; Mariatti Jaafar, Auteur Année de publication : 2009 Article en page(s) : pp. 695–703 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Fine  grinding  Jet  mill  Limestone  Mechanochemistry  Polypropylene Résumé : In this study, ultra-fine grinding of limestone was carried out in jet mill using four levels of classifier rotational speed and grinding pressure. The holdup amount was determined during the grinding process, while the feed rate was kept constant at 8 kg/h. The ground product was characterized for its particle size and shape. In addition, the mechanochemical effect on the ground product was characterized through XRD. The particles size of the ground product ranged from 2.21 μm to 7.29 μm, demonstrating various particle shapes such as cubical, angular, and elongated. The degree of crystallinity of the ground product ranged from 54.5% to 93.7%. Afterwards, the ground product was incorporated as filler in polypropylene (PP), and its performance was characterized for mechanical properties. After conducting the test work, we find that the PP filled with ground limestone exhibited excellent thermal and mechanical properties. The composite flexural modulus, impact strength, tensile strength, and elongation at break were 2.1 GPa, 42 kJ/m2, 22.75 MPa, and 21%, respectively, when loaded up to 20%. It likewise exhibited CTE value of 57.2 ppm/°C. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000661 [article] Value adding limestone to filler grade through an ultra-fine grinding process in jet mill for use in plastic industries [texte imprimé] / Samayamutthirian Palaniandy, Auteur ; Nurdina Abd Kadir, Auteur ; Mariatti Jaafar, Auteur . - 2009 . - pp. 695–703. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 695–703 Mots-clés : Fine  grinding  Jet  mill  Limestone  Mechanochemistry  Polypropylene Résumé : In this study, ultra-fine grinding of limestone was carried out in jet mill using four levels of classifier rotational speed and grinding pressure. The holdup amount was determined during the grinding process, while the feed rate was kept constant at 8 kg/h. The ground product was characterized for its particle size and shape. In addition, the mechanochemical effect on the ground product was characterized through XRD. The particles size of the ground product ranged from 2.21 μm to 7.29 μm, demonstrating various particle shapes such as cubical, angular, and elongated. The degree of crystallinity of the ground product ranged from 54.5% to 93.7%. Afterwards, the ground product was incorporated as filler in polypropylene (PP), and its performance was characterized for mechanical properties. After conducting the test work, we find that the PP filled with ground limestone exhibited excellent thermal and mechanical properties. The composite flexural modulus, impact strength, tensile strength, and elongation at break were 2.1 GPa, 42 kJ/m2, 22.75 MPa, and 21%, respectively, when loaded up to 20%. It likewise exhibited CTE value of 57.2 ppm/°C. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000661

Advances in ceramic media for high energy milling applications / Boris Y. Farber in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 704–709 Titre : Advances in ceramic media for high energy milling applications Type de document : texte imprimé Auteurs : Boris Y. Farber, Auteur ; Leo Knopjes, Auteur ; Nurie Bedesi, Auteur Année de publication : 2009 Article en page(s) : pp. 704–709 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Precious  metal  ores  Industrial  minerals  Fine  particle  processing  Grinding  Mineral  processing  Mill  media  High  energy  mills  Friction  coefficient  Media  Milling  Beads Résumé : The introduction of ceramic milling media specifically designed for high energy mills has resulted in significant improvements in both milling efficiency and the overall economics of mineral processing. Three media types were trialed in an Xstrata Technology M4 IsaMill to ascertain mill performance. Mill performance was related to media density, size, and friction. Based on these results, a model that incorporates media properties was developed and validated to predict milling performance and can be used to tailor milling media for specific applications. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002896 [article] Advances in ceramic media for high energy milling applications [texte imprimé] / Boris Y. Farber, Auteur ; Leo Knopjes, Auteur ; Nurie Bedesi, Auteur . - 2009 . - pp. 704–709. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 704–709 Mots-clés : Precious  metal  ores  Industrial  minerals  Fine  particle  processing  Grinding  Mineral  processing  Mill  media  High  energy  mills  Friction  coefficient  Media  Milling  Beads Résumé : The introduction of ceramic milling media specifically designed for high energy mills has resulted in significant improvements in both milling efficiency and the overall economics of mineral processing. Three media types were trialed in an Xstrata Technology M4 IsaMill to ascertain mill performance. Mill performance was related to media density, size, and friction. Based on these results, a model that incorporates media properties was developed and validated to predict milling performance and can be used to tailor milling media for specific applications. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002896

Applying traceability to grinding circuits by using Particle Texture Analysis (PTA) / Pejman Oghazi in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 710–718 Titre : Applying traceability to grinding circuits by using Particle Texture Analysis (PTA) Type de document : texte imprimé Auteurs : Pejman Oghazi, Auteur ; Bertil Pålsson, Auteur ; Kent Tano, Auteur Année de publication : 2009 Article en page(s) : pp. 710–718 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Traceability  Grinding  Multivariate  analysis Résumé : LKAB has started a new pelletizing plant at Malmberget, where the raw material will be a mix of ores from Kiruna and Malmberget. The new plant necessitated an investment in a new grinding section in the concentrator. As usual, the new section has larger mills. It also lacks the wet cobbing stage present in the old sections. Comparing the analysis data from the new grinding section with the old grinding sections it shows that they give similar results. There are slight variations; the older mills produce a steeper final particle size distribution. Also, it appears that the new mills are more efficient, since they have higher calculated grindability indices. To better understand the differences between the sections, and the process implications of the new grinding section, a combination of Particle Texture Analysis (PTA) and the statistical method multivariate data analysis (MVDA) is used. It shows that it is possible to identify and follow systematic changes in the particle morphology of the mill products. Also, that there are differences in process mineralogical aspect between the old and new grinding sections. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000296 [article] Applying traceability to grinding circuits by using Particle Texture Analysis (PTA) [texte imprimé] / Pejman Oghazi, Auteur ; Bertil Pålsson, Auteur ; Kent Tano, Auteur . - 2009 . - pp. 710–718. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 710–718 Mots-clés : Traceability  Grinding  Multivariate  analysis Résumé : LKAB has started a new pelletizing plant at Malmberget, where the raw material will be a mix of ores from Kiruna and Malmberget. The new plant necessitated an investment in a new grinding section in the concentrator. As usual, the new section has larger mills. It also lacks the wet cobbing stage present in the old sections. Comparing the analysis data from the new grinding section with the old grinding sections it shows that they give similar results. There are slight variations; the older mills produce a steeper final particle size distribution. Also, it appears that the new mills are more efficient, since they have higher calculated grindability indices. To better understand the differences between the sections, and the process implications of the new grinding section, a combination of Particle Texture Analysis (PTA) and the statistical method multivariate data analysis (MVDA) is used. It shows that it is possible to identify and follow systematic changes in the particle morphology of the mill products. Also, that there are differences in process mineralogical aspect between the old and new grinding sections. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000296

Optimization of comminution circuit simulations based on genetic algorithms search method / A. Farzanegan in Minerals engineering, Vol. 22 N° 7/8 (Juin/Juillet 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 719–726 Titre : Optimization of comminution circuit simulations based on genetic algorithms search method Type de document : texte imprimé Auteurs : A. Farzanegan, Auteur ; S.M. Vahidipour, Auteur Année de publication : 2009 Article en page(s) : pp. 719–726 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Modeling  Simulation  Evolutionary  optimization  Genetic  algorithms Résumé : Comminution simulators are extensively used by mineral processing engineers for plant design and optimization purposes. Recently, there had been a great progress in developing new and more powerful optimization methods such as Genetic Algorithms (GA), Ant Colony Optimization (ACO), Particle Swarm Optimization (PSO) and Tabu Search Algorithm (TSA). Simulation optimization is required if one wants to find the best steady-state values of important process variables. In this paper, the authors investigated the integration of GA optimization algorithm with a pre-existing grinding circuit simulator called Ball Milling Circuits Simulator (BMCS) in MATLAB™ environment. The BMCS code has been written in ANSI C language and has been validated against real industrial grinding circuit data sets. Various C modules of the BMCS grinding software were restructured under a new single source code file so that it can be imported into MATLAB. Then, a number of input simulation data were identified and selected as possible process variables (e.g., solids flow rate, water addition rate, and number of operating cyclones) which must be optimized in order to achieve a pre-defined process objective (e.g., a specific d80 of circuit output). The obtained results show that BMCS simulation trials can be successfully optimized by applying evolutionary algorithms via MATLAB toolboxes. This allows the mineral processor to perform automatic repetitive simulations to find the possible solutions of the problem at hand quickly. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000533 [article] Optimization of comminution circuit simulations based on genetic algorithms search method [texte imprimé] / A. Farzanegan, Auteur ; S.M. Vahidipour, Auteur . - 2009 . - pp. 719–726. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 7/8 (Juin/Juillet 2009) . - pp. 719–726 Mots-clés : Comminution  Modeling  Simulation  Evolutionary  optimization  Genetic  algorithms Résumé : Comminution simulators are extensively used by mineral processing engineers for plant design and optimization purposes. Recently, there had been a great progress in developing new and more powerful optimization methods such as Genetic Algorithms (GA), Ant Colony Optimization (ACO), Particle Swarm Optimization (PSO) and Tabu Search Algorithm (TSA). Simulation optimization is required if one wants to find the best steady-state values of important process variables. In this paper, the authors investigated the integration of GA optimization algorithm with a pre-existing grinding circuit simulator called Ball Milling Circuits Simulator (BMCS) in MATLAB™ environment. The BMCS code has been written in ANSI C language and has been validated against real industrial grinding circuit data sets. Various C modules of the BMCS grinding software were restructured under a new single source code file so that it can be imported into MATLAB. Then, a number of input simulation data were identified and selected as possible process variables (e.g., solids flow rate, water addition rate, and number of operating cyclones) which must be optimized in order to achieve a pre-defined process objective (e.g., a specific d80 of circuit output). The obtained results show that BMCS simulation trials can be successfully optimized by applying evolutionary algorithms via MATLAB toolboxes. This allows the mineral processor to perform automatic repetitive simulations to find the possible solutions of the problem at hand quickly. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000533

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