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Minerals engineering / Wills, Barry A. . Vol. 23 N° 9Minerals engineeringMention de date : Août 2010 Paru le : 11/12/2011 |
Dépouillements
Ajouter le résultat dans votre panierFlowsheet considerations for optimal use of high pressure grinding rolls / F.P. Van der Meer in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 663–669
Titre : Flowsheet considerations for optimal use of high pressure grinding rolls Type de document : texte imprimé Auteurs : F.P. Van der Meer, Auteur ; A. Gruendken, Auteur Année de publication : 2011 Article en page(s) : pp. 663–669 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution Crushing Grinding High pressure grinding rolls Roller press Résumé : High pressure grinding roll (“HPGR”) technology is very rapidly gaining a wide acceptance within the mineral processing industry. Benefits, including a superior energy efficiency and a lower overall operating cost of an HPGR based circuit compared to alternative technologies have been demonstrated at a number of operations throughout the world. Increasing numbers of units are presently being installed in the minerals industry world-wide. This trend is an excellent reflection of the confidence now placed in the technology by new and existing users.
This paper summarizes basic principles of the equipment and of various options how to include an HPRG in the grinding circuit for most efficient use. Case studies demonstrate the application of HPGR’s in different grinding circuit set-ups and for the comminution of different ore types. Benefits of the options of open circuit grinding, closed circuit grinding incorporating wet and dry screening as well as the option of achieving a finer grind by recirculating part of the HPGR product using a mechanical splitter are discussed.
From a processing point of view the effects of partial product recycle are detailed and some guidance for selection of cut size between HPGR and ball mill is provided.DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002374 [article] Flowsheet considerations for optimal use of high pressure grinding rolls [texte imprimé] / F.P. Van der Meer, Auteur ; A. Gruendken, Auteur . - 2011 . - pp. 663–669.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 663–669
Mots-clés : Comminution Crushing Grinding High pressure grinding rolls Roller press Résumé : High pressure grinding roll (“HPGR”) technology is very rapidly gaining a wide acceptance within the mineral processing industry. Benefits, including a superior energy efficiency and a lower overall operating cost of an HPGR based circuit compared to alternative technologies have been demonstrated at a number of operations throughout the world. Increasing numbers of units are presently being installed in the minerals industry world-wide. This trend is an excellent reflection of the confidence now placed in the technology by new and existing users.
This paper summarizes basic principles of the equipment and of various options how to include an HPRG in the grinding circuit for most efficient use. Case studies demonstrate the application of HPGR’s in different grinding circuit set-ups and for the comminution of different ore types. Benefits of the options of open circuit grinding, closed circuit grinding incorporating wet and dry screening as well as the option of achieving a finer grind by recirculating part of the HPGR product using a mechanical splitter are discussed.
From a processing point of view the effects of partial product recycle are detailed and some guidance for selection of cut size between HPGR and ball mill is provided.DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002374 Preparation of hydrolyzate of hogwash oil (HHO) and its application in separating diaspore from kaolinite / Wei Sun in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 670–675
Titre : Preparation of hydrolyzate of hogwash oil (HHO) and its application in separating diaspore from kaolinite Type de document : texte imprimé Auteurs : Wei Sun, Auteur ; Kui Ouyang, Auteur ; Limin Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 670–675 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Recycling Flotation collectors Oxide ores Mineral processing Résumé : Hydrolyzate of hogwash oil (HHO) was prepared at ambient pressure using hogwash oil that was collected from the dietary industry as a raw material by means of non-pressurized multistage hydrolyzation. Before hydrolyzation, the collected hogwash oil was subject to pre-treatment that included deposition edulcoration, acidification degumming and deodorization by digestion as well as vacuum dewatering. Components of the synthesized products were detected by gas chromatography and the results indicated that unsaturated fatty acids are the major components.
Using HHO as a collector, the flotation behavior of diaspore and kaolinite was investigated. The reaction mechanisms of diaspore and kaolinite with HHO are discussed based on a zeta potential test. The results showed that a concentrate with a mass ratio of Al2O3 to SiO2 of 14.42 and an Al2O3 recovery of 81.80% can be obtained at a feed mass ratio of Al2O3 to SiO2 of 5. This indicated that the HHO is a potential collector for separating diaspore from aluminosilicate minerals in bauxite. The results also suggested a possible way to reuse discarded hogwash oil to avoid environmental pollutioDEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000907 [article] Preparation of hydrolyzate of hogwash oil (HHO) and its application in separating diaspore from kaolinite [texte imprimé] / Wei Sun, Auteur ; Kui Ouyang, Auteur ; Limin Zhang, Auteur . - 2011 . - pp. 670–675.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 670–675
Mots-clés : Recycling Flotation collectors Oxide ores Mineral processing Résumé : Hydrolyzate of hogwash oil (HHO) was prepared at ambient pressure using hogwash oil that was collected from the dietary industry as a raw material by means of non-pressurized multistage hydrolyzation. Before hydrolyzation, the collected hogwash oil was subject to pre-treatment that included deposition edulcoration, acidification degumming and deodorization by digestion as well as vacuum dewatering. Components of the synthesized products were detected by gas chromatography and the results indicated that unsaturated fatty acids are the major components.
Using HHO as a collector, the flotation behavior of diaspore and kaolinite was investigated. The reaction mechanisms of diaspore and kaolinite with HHO are discussed based on a zeta potential test. The results showed that a concentrate with a mass ratio of Al2O3 to SiO2 of 14.42 and an Al2O3 recovery of 81.80% can be obtained at a feed mass ratio of Al2O3 to SiO2 of 5. This indicated that the HHO is a potential collector for separating diaspore from aluminosilicate minerals in bauxite. The results also suggested a possible way to reuse discarded hogwash oil to avoid environmental pollutioDEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510000907 The first-principle study of the effect of lattice impurity on adsorption of CN on sphalerite surface / Ye Chen in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 676–684
Titre : The first-principle study of the effect of lattice impurity on adsorption of CN on sphalerite surface Type de document : texte imprimé Auteurs : Ye Chen, Auteur ; Jianhua Chen, Auteur Année de publication : 2011 Article en page(s) : pp. 676–684 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulphide ores Froth flotation Simulation Résumé : The adsorption of CN on sphalerite (1 1 0) surface and the effects of lattice impurities on the surface adsorption have been investigated using density-functional theory (DFT). The results show that CN adsorbs strongly on perfect sphalerite (1 1 0) surface, where C atom and N atom of CN molecule are bonding with two Zn atoms on the surface. The presence of Fe/Mn/Cu-impurity on sphalerite surface was shown to enhance the CN adsorption, however; Cd impurity worked in the opposite. The adsorption mode of CN on defective surfaces is mainly via C atom interacting with the impurity atom, and s orbital of C interacts with sp orbital of Fe/Mn/Cu to form the covalent bond, and d orbital of Fe/Mn/Cu donates electrons to the anti-bonding p orbital of C to form the back donating π bonding. While on the Cd-bearing surface, Cd 4d orbital donates fewer electrons to the vacant View the MathML source of C, and thus no back donating π bonding appears and the adsorption of CN on Cd-bearing sphalerite surface is weak. The simulations of CN adsorption show that Fe-bearing sphalerite could be easily depressed by cyanide, while Cd-bearing sphalerite is difficult to be depressed by cyanide. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268751000110X [article] The first-principle study of the effect of lattice impurity on adsorption of CN on sphalerite surface [texte imprimé] / Ye Chen, Auteur ; Jianhua Chen, Auteur . - 2011 . - pp. 676–684.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 676–684
Mots-clés : Sulphide ores Froth flotation Simulation Résumé : The adsorption of CN on sphalerite (1 1 0) surface and the effects of lattice impurities on the surface adsorption have been investigated using density-functional theory (DFT). The results show that CN adsorbs strongly on perfect sphalerite (1 1 0) surface, where C atom and N atom of CN molecule are bonding with two Zn atoms on the surface. The presence of Fe/Mn/Cu-impurity on sphalerite surface was shown to enhance the CN adsorption, however; Cd impurity worked in the opposite. The adsorption mode of CN on defective surfaces is mainly via C atom interacting with the impurity atom, and s orbital of C interacts with sp orbital of Fe/Mn/Cu to form the covalent bond, and d orbital of Fe/Mn/Cu donates electrons to the anti-bonding p orbital of C to form the back donating π bonding. While on the Cd-bearing surface, Cd 4d orbital donates fewer electrons to the vacant View the MathML source of C, and thus no back donating π bonding appears and the adsorption of CN on Cd-bearing sphalerite surface is weak. The simulations of CN adsorption show that Fe-bearing sphalerite could be easily depressed by cyanide, while Cd-bearing sphalerite is difficult to be depressed by cyanide. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268751000110X Recovery of boron from borax sludge of boron industry / Mine Özdemir in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 685–690
Titre : Recovery of boron from borax sludge of boron industry Type de document : texte imprimé Auteurs : Mine Özdemir, Auteur ; İlker Kıpçak, Auteur Année de publication : 2011 Article en page(s) : pp. 685–690 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Boron Tailing Leaching Recycling Waste processing Résumé : A two-step process for boron recovery from borax sludge is proposed in the present work. The borax sludge was leached with sulphuric acid solution. Then, for the removal of alkaline species from the leachate, calcium and magnesium were precipitated by adjusting the pH of leachate using 1.5 M NaOH and 1.5 M HCl solutions. The effects of pH, temperature, concentration and time on the precipitation process were investigated. It was determined that the calcium and magnesium concentrations in the leachate were reduced from 121 mg/L to 2.6 mg/L and from 145 mg/L to 4.0 mg/L, respectively, at a pH value of 12, a temperature of 70 °C, an initial boron concentration of 500 mg/L and a precipitation time of 3 h. Under these optimum conditions, it was observed that the boron concentration in the solution decreased very slightly. In this process, the alkaline species were successfully separated from the boron.
Finally, borax pentahydrate (Na2B4O7·5H2O) was produced by the evaporation of the final solution obtained after precipitation process.DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001111 [article] Recovery of boron from borax sludge of boron industry [texte imprimé] / Mine Özdemir, Auteur ; İlker Kıpçak, Auteur . - 2011 . - pp. 685–690.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 685–690
Mots-clés : Boron Tailing Leaching Recycling Waste processing Résumé : A two-step process for boron recovery from borax sludge is proposed in the present work. The borax sludge was leached with sulphuric acid solution. Then, for the removal of alkaline species from the leachate, calcium and magnesium were precipitated by adjusting the pH of leachate using 1.5 M NaOH and 1.5 M HCl solutions. The effects of pH, temperature, concentration and time on the precipitation process were investigated. It was determined that the calcium and magnesium concentrations in the leachate were reduced from 121 mg/L to 2.6 mg/L and from 145 mg/L to 4.0 mg/L, respectively, at a pH value of 12, a temperature of 70 °C, an initial boron concentration of 500 mg/L and a precipitation time of 3 h. Under these optimum conditions, it was observed that the boron concentration in the solution decreased very slightly. In this process, the alkaline species were successfully separated from the boron.
Finally, borax pentahydrate (Na2B4O7·5H2O) was produced by the evaporation of the final solution obtained after precipitation process.DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001111 A comparison of the electrochemical behaviors of pyrite and chalcopyrite in a NaCl solution at room temperature and under differential stress / Qingyou Liu in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 691–697
Titre : A comparison of the electrochemical behaviors of pyrite and chalcopyrite in a NaCl solution at room temperature and under differential stress Type de document : texte imprimé Auteurs : Qingyou Liu, Auteur ; Heping Li, Auteur Année de publication : 2011 Article en page(s) : pp. 691–697 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Pyrite Chalcopyrite Polarization curve Electrical impedance spectroscopy Differential stress Résumé : Electrochemical behaviors of pyrite and chalcopyrite were studied by measuring polarization curves and electrochemical impedance spectroscopy (EIS) in a NaCl solution at room temperature and under differential stress. The results from differential stress experiments show that there is a negative linear relation between potential difference and elastic stress. The corrosion current density distinctly increased, and the corrosion potential became more negative with an increase in differential stress. The charge transfer electrical resistance increased, the double layer capacitance decreased, and other characteristic parameters are observed with increasing differential stress. The experimental results are significant for sulfide mineral engineering. By using different equivalent electrical circuits, the point defect model, and corrosion theory, we explain the experimental results theoretically. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001135 [article] A comparison of the electrochemical behaviors of pyrite and chalcopyrite in a NaCl solution at room temperature and under differential stress [texte imprimé] / Qingyou Liu, Auteur ; Heping Li, Auteur . - 2011 . - pp. 691–697.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 691–697
Mots-clés : Pyrite Chalcopyrite Polarization curve Electrical impedance spectroscopy Differential stress Résumé : Electrochemical behaviors of pyrite and chalcopyrite were studied by measuring polarization curves and electrochemical impedance spectroscopy (EIS) in a NaCl solution at room temperature and under differential stress. The results from differential stress experiments show that there is a negative linear relation between potential difference and elastic stress. The corrosion current density distinctly increased, and the corrosion potential became more negative with an increase in differential stress. The charge transfer electrical resistance increased, the double layer capacitance decreased, and other characteristic parameters are observed with increasing differential stress. The experimental results are significant for sulfide mineral engineering. By using different equivalent electrical circuits, the point defect model, and corrosion theory, we explain the experimental results theoretically. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001135 The interaction of thiourea and formamidine disulfide in the dissolution of gold in sulfuric acid solutions / Xiyun Yang in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 698–704
Titre : The interaction of thiourea and formamidine disulfide in the dissolution of gold in sulfuric acid solutions Type de document : texte imprimé Auteurs : Xiyun Yang, Auteur ; Michael S. Moats, Auteur ; Jan D. Miller, Auteur Année de publication : 2011 Article en page(s) : pp. 698–704 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Leaching Oxidation Redox reaction Résumé : The mechanism of gold dissolution in acidic thiourea (Tu) solutions was investigated using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV). CV over the potential range of −0.3 to 0.75 V vs. SCE shows peaks for the Tu/FDS (formamidine disulfide) and View the MathML source redox reactions. An oxidation peak associated with gold dissolution occurs at ϕ ⩾ 0.36 V vs. SCE. This peak is often not observed in the first scan and its presence and magnitude are sensitive to the positive sweep potential limit of the first scan. FDS addition to the solution or adsorbed on the electrode has a strong catalytic effect and makes gold dissolution peak shift to lower potential during the first scan. This catalytic effect is identical to that exerted by scanning to higher potential. Tu/FDS ratio has a significant effect on thiourea stability, and it should be about 10:1 for the minimum thiourea decomposition and maximum gold dissolution rate. EIS results at 0.5−0.7 V vs. SCE with only Tu initially present in solution reveal a high-frequency capacitive loop associated with double layer charging, a medium-frequency inductive loop associated with FDS adsorption, and a low-frequency capacitive loop related to Tu oxidation. It appears that FDS adsorption on the gold surface activates the dissolution of gold and inhibits the oxidation of Tu. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001147 [article] The interaction of thiourea and formamidine disulfide in the dissolution of gold in sulfuric acid solutions [texte imprimé] / Xiyun Yang, Auteur ; Michael S. Moats, Auteur ; Jan D. Miller, Auteur . - 2011 . - pp. 698–704.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 698–704
Mots-clés : Leaching Oxidation Redox reaction Résumé : The mechanism of gold dissolution in acidic thiourea (Tu) solutions was investigated using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV). CV over the potential range of −0.3 to 0.75 V vs. SCE shows peaks for the Tu/FDS (formamidine disulfide) and View the MathML source redox reactions. An oxidation peak associated with gold dissolution occurs at ϕ ⩾ 0.36 V vs. SCE. This peak is often not observed in the first scan and its presence and magnitude are sensitive to the positive sweep potential limit of the first scan. FDS addition to the solution or adsorbed on the electrode has a strong catalytic effect and makes gold dissolution peak shift to lower potential during the first scan. This catalytic effect is identical to that exerted by scanning to higher potential. Tu/FDS ratio has a significant effect on thiourea stability, and it should be about 10:1 for the minimum thiourea decomposition and maximum gold dissolution rate. EIS results at 0.5−0.7 V vs. SCE with only Tu initially present in solution reveal a high-frequency capacitive loop associated with double layer charging, a medium-frequency inductive loop associated with FDS adsorption, and a low-frequency capacitive loop related to Tu oxidation. It appears that FDS adsorption on the gold surface activates the dissolution of gold and inhibits the oxidation of Tu. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001147 Energy efficient slurry holding and transport / Jie Wu in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 705–712
Titre : Energy efficient slurry holding and transport Type de document : texte imprimé Auteurs : Jie Wu, Auteur ; Lachlan Graham, Auteur ; Steven Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 705–712 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Energy efficiency Specific energy consumption (SEC) Slurry pipelines Slurry tanks Slurry transport Solids suspension Résumé : Slurry suspension in holding tanks and transport through pipelines are essential elements in the modern mining and mineral processing industry. This paper presents methods to improve the energy efficiency of solids suspension in tanks and slurry transport through pipelines for low viscosity Newtonian slurries. Research has been conducted using laboratory experiments and analysis using established equations. It is shown that there are many similarities between these two traditionally separated research areas. It is concluded that energy per unit solids mass generally varies with solids concentration for both systems. The specific energy can be minimised by operating at a suitable solids concentration, for example in the range of 20–30% (v/v) for the slurry properties considered in this paper. It is also concluded that the specific energy generally decreases with the size of equipment, i.e. tank diameter or pipe diameter, although this effect tends to plateau at large sizes. It was found that when a slurry pipeline is used as a reactor, it generally requires more power to suspend solids per unit solids mass than a mixing tank. Great energy saving can be achieved by operating a slurry tank with baffles removed, if off-bottom solids suspension is the limiting factor. Basic equations for specific energy consumption (SEC) are included. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001160 [article] Energy efficient slurry holding and transport [texte imprimé] / Jie Wu, Auteur ; Lachlan Graham, Auteur ; Steven Wang, Auteur . - 2011 . - pp. 705–712.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 705–712
Mots-clés : Energy efficiency Specific energy consumption (SEC) Slurry pipelines Slurry tanks Slurry transport Solids suspension Résumé : Slurry suspension in holding tanks and transport through pipelines are essential elements in the modern mining and mineral processing industry. This paper presents methods to improve the energy efficiency of solids suspension in tanks and slurry transport through pipelines for low viscosity Newtonian slurries. Research has been conducted using laboratory experiments and analysis using established equations. It is shown that there are many similarities between these two traditionally separated research areas. It is concluded that energy per unit solids mass generally varies with solids concentration for both systems. The specific energy can be minimised by operating at a suitable solids concentration, for example in the range of 20–30% (v/v) for the slurry properties considered in this paper. It is also concluded that the specific energy generally decreases with the size of equipment, i.e. tank diameter or pipe diameter, although this effect tends to plateau at large sizes. It was found that when a slurry pipeline is used as a reactor, it generally requires more power to suspend solids per unit solids mass than a mixing tank. Great energy saving can be achieved by operating a slurry tank with baffles removed, if off-bottom solids suspension is the limiting factor. Basic equations for specific energy consumption (SEC) are included. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001160 Modeling and optimization of high chromium alloy wear in phosphate laboratory grinding mill with fuzzy logic and particle swarm optimization technique / Mohammad Kor in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 713–719
Titre : Modeling and optimization of high chromium alloy wear in phosphate laboratory grinding mill with fuzzy logic and particle swarm optimization technique Type de document : texte imprimé Auteurs : Mohammad Kor, Auteur ; Emad Abkhoshk, Auteur ; Daniel Tao, Auteur Année de publication : 2011 Article en page(s) : pp. 713–719 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Grinding Modeling Expert systems Résumé : This study evaluated the potential of fuzzy logic as an alternative method to the traditional statistical regression techniques, which were employed in a previous publication (Chen et al., 2006), for predicting the wear rate of high chromium alloy during phosphate grinding. Moreover an attempt has been made to use a novel particle swarm optimization technique to determine the optimum process parameters for minimum wear rate. The comparison of a fuzzy model and a regression model, which was assessed by various measures (i.e., root mean square error (RMSE), R2 and the percentage of predicted values that are within the 5% tolerance of the corresponding actual values), showed the superiority of the developed fuzzy model. The optimization results indicated that the minimum liner wear rate can be obtained with solution pH of 10.5, a rotation speed of 52 rpm, a solid concentration of 63% and a crop load 70%. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001172 [article] Modeling and optimization of high chromium alloy wear in phosphate laboratory grinding mill with fuzzy logic and particle swarm optimization technique [texte imprimé] / Mohammad Kor, Auteur ; Emad Abkhoshk, Auteur ; Daniel Tao, Auteur . - 2011 . - pp. 713–719.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 713–719
Mots-clés : Grinding Modeling Expert systems Résumé : This study evaluated the potential of fuzzy logic as an alternative method to the traditional statistical regression techniques, which were employed in a previous publication (Chen et al., 2006), for predicting the wear rate of high chromium alloy during phosphate grinding. Moreover an attempt has been made to use a novel particle swarm optimization technique to determine the optimum process parameters for minimum wear rate. The comparison of a fuzzy model and a regression model, which was assessed by various measures (i.e., root mean square error (RMSE), R2 and the percentage of predicted values that are within the 5% tolerance of the corresponding actual values), showed the superiority of the developed fuzzy model. The optimization results indicated that the minimum liner wear rate can be obtained with solution pH of 10.5, a rotation speed of 52 rpm, a solid concentration of 63% and a crop load 70%. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001172 Experimental analysis of wet mill load based on vibration signals of laboratory-scale ball mill shell / Jian Tang in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 720–730
Titre : Experimental analysis of wet mill load based on vibration signals of laboratory-scale ball mill shell Type de document : texte imprimé Auteurs : Jian Tang, Auteur ; Li-jie Zhao, Auteur ; Jun-wu Zhou, Auteur Année de publication : 2011 Article en page(s) : pp. 720–730 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution Grinding Artificial intelligence Modeling Résumé : Real-time measurement of the mill load is the key to improve the production capacity and energy efficiency for the grinding process. In this paper, experimental analysis of the wet mill load based on the vibration signals of the laboratory-scale ball mill shell is presented. A series of experiments are conducted to investigate the vibration characteristics corresponding to different grinding conditions such as dry grinding, wet grinding and water grinding. The power spectral density of the vibration signals is systematically interpreted.
Experimental results show that the rheological properties of the pulp affect the amplitude and frequency of the vibration signal. The most important conclusion is that the frequency range of the shell vibration of the laboratory wet mill can be divided into three parts, namely natural frequency band, main impact frequency band and secondary impact frequency band. Finally, soft-sensor models between vibration signal and mill operating parameters of mill load are established using genetic algorithm-partial least square (GA-PLS) technology. After more work on industry scale ball mill is done, the soft-sensor modeling based on the mill shell vibration for operating parameters of mill load will improve the performance of the ball mill in the grinding process.DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001202 [article] Experimental analysis of wet mill load based on vibration signals of laboratory-scale ball mill shell [texte imprimé] / Jian Tang, Auteur ; Li-jie Zhao, Auteur ; Jun-wu Zhou, Auteur . - 2011 . - pp. 720–730.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 720–730
Mots-clés : Comminution Grinding Artificial intelligence Modeling Résumé : Real-time measurement of the mill load is the key to improve the production capacity and energy efficiency for the grinding process. In this paper, experimental analysis of the wet mill load based on the vibration signals of the laboratory-scale ball mill shell is presented. A series of experiments are conducted to investigate the vibration characteristics corresponding to different grinding conditions such as dry grinding, wet grinding and water grinding. The power spectral density of the vibration signals is systematically interpreted.
Experimental results show that the rheological properties of the pulp affect the amplitude and frequency of the vibration signal. The most important conclusion is that the frequency range of the shell vibration of the laboratory wet mill can be divided into three parts, namely natural frequency band, main impact frequency band and secondary impact frequency band. Finally, soft-sensor models between vibration signal and mill operating parameters of mill load are established using genetic algorithm-partial least square (GA-PLS) technology. After more work on industry scale ball mill is done, the soft-sensor modeling based on the mill shell vibration for operating parameters of mill load will improve the performance of the ball mill in the grinding process.DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001202 Use of mesalime and electric arc furnace (EAF) dust as neutralising agents in biooxidation and their effects on gold recovery in subsequent cyanidation / Chandra Sekhar Gahan in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 731–738
Titre : Use of mesalime and electric arc furnace (EAF) dust as neutralising agents in biooxidation and their effects on gold recovery in subsequent cyanidation Type de document : texte imprimé Auteurs : Chandra Sekhar Gahan, Auteur ; Jan-Eric Sundkvist, Auteur ; Åke Sandström, Auteur Année de publication : 2011 Article en page(s) : pp. 731–738 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mesalime EAF dust Neutralisation Biooxidation Cyanidation Résumé : The cost of lime/limestone for neutralisation is the second largest operating cost in bioleaching. Therefore, these studies have been conducted with the aim to investigate the possibilities for use of by-products such as mesalime and electric arc furnace (EAF) dust for neutralisation during biooxidation of a refractory gold concentrate. Experiments were carried out using a retention time of 57 h in a one-stage reactor and the influence of two industrial by-products on the biooxidation performance was evaluated. The neutralising capacity of EAF dust was lower, while the mesalime was similar to the Ca(OH)2 reference. The arsenopyrite oxidation in experiments ranged from 85% to 90%, whereas the pyrite oxidation was 63–74%. In subsequent cyanidation, final gold recoveries of 90% were achieved in bioresidues from mesalime and Ca(OH)2, while the EAF dust bioresidue had a recovery of 85%. A comparatively high elemental sulphur content in EAF dust probably encapsulates part of the gold, which explains the lower recovery for the EAF dust bioresidue despite a longer residence time. Cyanide consumption was relatively high and ranged from 8.1 to 9.2 kg/ton feed after 24 h of cyanidation. Overall, the by-products tested here have proved to be feasible options as neutralising agents in bioleaching operations. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001226 [article] Use of mesalime and electric arc furnace (EAF) dust as neutralising agents in biooxidation and their effects on gold recovery in subsequent cyanidation [texte imprimé] / Chandra Sekhar Gahan, Auteur ; Jan-Eric Sundkvist, Auteur ; Åke Sandström, Auteur . - 2011 . - pp. 731–738.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 731–738
Mots-clés : Mesalime EAF dust Neutralisation Biooxidation Cyanidation Résumé : The cost of lime/limestone for neutralisation is the second largest operating cost in bioleaching. Therefore, these studies have been conducted with the aim to investigate the possibilities for use of by-products such as mesalime and electric arc furnace (EAF) dust for neutralisation during biooxidation of a refractory gold concentrate. Experiments were carried out using a retention time of 57 h in a one-stage reactor and the influence of two industrial by-products on the biooxidation performance was evaluated. The neutralising capacity of EAF dust was lower, while the mesalime was similar to the Ca(OH)2 reference. The arsenopyrite oxidation in experiments ranged from 85% to 90%, whereas the pyrite oxidation was 63–74%. In subsequent cyanidation, final gold recoveries of 90% were achieved in bioresidues from mesalime and Ca(OH)2, while the EAF dust bioresidue had a recovery of 85%. A comparatively high elemental sulphur content in EAF dust probably encapsulates part of the gold, which explains the lower recovery for the EAF dust bioresidue despite a longer residence time. Cyanide consumption was relatively high and ranged from 8.1 to 9.2 kg/ton feed after 24 h of cyanidation. Overall, the by-products tested here have proved to be feasible options as neutralising agents in bioleaching operations. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001226 Characterisation of a uranium ore using multiple X-ray diffraction based methods / Hailey S. Reynolds in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 739–745
Titre : Characterisation of a uranium ore using multiple X-ray diffraction based methods Type de document : texte imprimé Auteurs : Hailey S. Reynolds, Auteur ; Rahul Ram, Auteur ; Fiona A. Charalambous, Auteur Année de publication : 2011 Article en page(s) : pp. 739–745 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Tailings Ore mineralogy Characterisation of gangue minerals Synchrotron X-ray diffraction High temperature X-ray diffraction Résumé : Uranium bearing ores are often a complex mixture of minerals and compounds, a number of which are not of economic importance and are commonly referred to as gangue materials. In order to improve the efficiency of the dissolution stage of the overall uranium extraction process, a greater understanding of the minerals and compounds present in the ore is required. A greater knowledge of the gangue materials present is important as they can influence various aspects of the dissolution process such as providing potential adsorption sites for aqueous uranium species and through influencing the equilibrium of reactions involving aqueous uranium species. In this study the mineralogy of a uranium ore was investigated using a range of X-ray diffraction (XRD) based methods including in situ high temperature XRD and XRD using a synchrotron beam line. The results obtained from standard XRD (Cu Kα), high temperature XRD and synchrotron XRD (16.534 keV) were compared and a number of minerals were identified. The improved spatial resolution and intensity of the synchrotron data allowed for superior phase identification of a variety of minerals where standard X-ray techniques gave inconclusive results. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001391 [article] Characterisation of a uranium ore using multiple X-ray diffraction based methods [texte imprimé] / Hailey S. Reynolds, Auteur ; Rahul Ram, Auteur ; Fiona A. Charalambous, Auteur . - 2011 . - pp. 739–745.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 739–745
Mots-clés : Tailings Ore mineralogy Characterisation of gangue minerals Synchrotron X-ray diffraction High temperature X-ray diffraction Résumé : Uranium bearing ores are often a complex mixture of minerals and compounds, a number of which are not of economic importance and are commonly referred to as gangue materials. In order to improve the efficiency of the dissolution stage of the overall uranium extraction process, a greater understanding of the minerals and compounds present in the ore is required. A greater knowledge of the gangue materials present is important as they can influence various aspects of the dissolution process such as providing potential adsorption sites for aqueous uranium species and through influencing the equilibrium of reactions involving aqueous uranium species. In this study the mineralogy of a uranium ore was investigated using a range of X-ray diffraction (XRD) based methods including in situ high temperature XRD and XRD using a synchrotron beam line. The results obtained from standard XRD (Cu Kα), high temperature XRD and synchrotron XRD (16.534 keV) were compared and a number of minerals were identified. The improved spatial resolution and intensity of the synchrotron data allowed for superior phase identification of a variety of minerals where standard X-ray techniques gave inconclusive results. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001391 Upgrading of a chalcopyrite concentrate by reaction with copper(II) and sulfite / Adam J. Fischmann in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 746–751
Titre : Upgrading of a chalcopyrite concentrate by reaction with copper(II) and sulfite : Unexpected formation of Chevreul’s salt, Cu2SO3·CuSO3·2H2O Type de document : texte imprimé Auteurs : Adam J. Fischmann, Auteur ; David G. Dixon, Auteur Année de publication : 2011 Article en page(s) : pp. 746–751 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulfide ores Hydrometallurgy Non-ferrous metallic ores Reduction Résumé : Recovery of aqueous copper(II) onto a chalcopyrite concentrate was shown to be rapid at 60 °C in the presence of S(IV), in this case sulfite. Surprisingly, rather than partial conversion of chalcopyrite to a copper sulfide such as chalcocite or covellite, copper was removed from solution by precipitation of a mixed-valence copper sulfite, Chevreul’s salt (Cu2SO3·CuSO3·2H2O). This has application as a way to increase the copper grade of chalcopyrite concentrates using the leachate from a Galvanox™ leach of flotation tailings, offering several advantages over similar processes employing an autoclave to effect copper precipitation. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001408 [article] Upgrading of a chalcopyrite concentrate by reaction with copper(II) and sulfite : Unexpected formation of Chevreul’s salt, Cu2SO3·CuSO3·2H2O [texte imprimé] / Adam J. Fischmann, Auteur ; David G. Dixon, Auteur . - 2011 . - pp. 746–751.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 746–751
Mots-clés : Sulfide ores Hydrometallurgy Non-ferrous metallic ores Reduction Résumé : Recovery of aqueous copper(II) onto a chalcopyrite concentrate was shown to be rapid at 60 °C in the presence of S(IV), in this case sulfite. Surprisingly, rather than partial conversion of chalcopyrite to a copper sulfide such as chalcocite or covellite, copper was removed from solution by precipitation of a mixed-valence copper sulfite, Chevreul’s salt (Cu2SO3·CuSO3·2H2O). This has application as a way to increase the copper grade of chalcopyrite concentrates using the leachate from a Galvanox™ leach of flotation tailings, offering several advantages over similar processes employing an autoclave to effect copper precipitation. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001408 Predicting the crushability of rocks from the impact strength index / O.Y. Toraman in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 752–754
Titre : Predicting the crushability of rocks from the impact strength index Type de document : texte imprimé Auteurs : O.Y. Toraman, Auteur ; S. Kahraman, Auteur ; S. Cayirli, Auteur Année de publication : 2011 Article en page(s) : pp. 752–754 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Crushing Mineral processing Liberation Résumé : To investigate the possibility of predicting the crushability of rocks from impact strength index, twenty-four different rock types were tested in the laboratory. The crushability results were correlated with the results of impact strength test and regression analysis was performed. A strong inverse linear relation between the crushability index and the impact strength index was found. The effect of porosity and density on the correlation was also shown. In addition, multiple regression analysis including porosity and density was carried out. The significances of the derived models were statistically tested. It was concluded that the crushability of rocks can practically be estimated from the impact strength index using the simple regression model. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001123 [article] Predicting the crushability of rocks from the impact strength index [texte imprimé] / O.Y. Toraman, Auteur ; S. Kahraman, Auteur ; S. Cayirli, Auteur . - 2011 . - pp. 752–754.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 752–754
Mots-clés : Crushing Mineral processing Liberation Résumé : To investigate the possibility of predicting the crushability of rocks from impact strength index, twenty-four different rock types were tested in the laboratory. The crushability results were correlated with the results of impact strength test and regression analysis was performed. A strong inverse linear relation between the crushability index and the impact strength index was found. The effect of porosity and density on the correlation was also shown. In addition, multiple regression analysis including porosity and density was carried out. The significances of the derived models were statistically tested. It was concluded that the crushability of rocks can practically be estimated from the impact strength index using the simple regression model. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001123 Selective and direct sorption of zirconium from acidic leach liquor of zircon concentrate by rice bran / Ehsan Zolfonoun in Minerals engineering, Vol. 23 N° 9 (Août 2010)
[article]
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 755–756
Titre : Selective and direct sorption of zirconium from acidic leach liquor of zircon concentrate by rice bran Type de document : texte imprimé Auteurs : Ehsan Zolfonoun, Auteur ; Akbar Boveiri Monji, Auteur ; Mohammad Taghizadeh, Auteur Année de publication : 2011 Article en page(s) : pp. 755–756 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Zirconium Zircon concentrate Biosorption Rice bran Résumé : A new method for extraction of zirconium from leach liquor of zircon concentrate is proposed. The procedure is based on the adsorption of Zr(IV) ions on rice bran. The sorption capacity of the biomass for zirconium is 50 mg g−1. Adsorption equilibrium was achieved in less than 1 min and slightly affected by solution acidity. In the optimum conditions, the adsorption efficiencies of other associated metal ions such as Ti4+, Fe3+, Al3+, La3+, Ce3+ were significantly lower than Zr(IV) ion and this biomass is excellent sorbent for the selective uptake of zirconium from acidic aqueous solutions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001263 [article] Selective and direct sorption of zirconium from acidic leach liquor of zircon concentrate by rice bran [texte imprimé] / Ehsan Zolfonoun, Auteur ; Akbar Boveiri Monji, Auteur ; Mohammad Taghizadeh, Auteur . - 2011 . - pp. 755–756.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 9 (Août 2010) . - pp. 755–756
Mots-clés : Zirconium Zircon concentrate Biosorption Rice bran Résumé : A new method for extraction of zirconium from leach liquor of zircon concentrate is proposed. The procedure is based on the adsorption of Zr(IV) ions on rice bran. The sorption capacity of the biomass for zirconium is 50 mg g−1. Adsorption equilibrium was achieved in less than 1 min and slightly affected by solution acidity. In the optimum conditions, the adsorption efficiencies of other associated metal ions such as Ti4+, Fe3+, Al3+, La3+, Ce3+ were significantly lower than Zr(IV) ion and this biomass is excellent sorbent for the selective uptake of zirconium from acidic aqueous solutions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001263
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