Dépouillements

Technological and economic strategies for the optimization of Polish electrolytic copper production plants / D. Saramak in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 757–764 Titre : Technological and economic strategies for the optimization of Polish electrolytic copper production plants Type de document : texte imprimé Auteurs : D. Saramak, Auteur ; T. Tumidajski, Auteur ; B. Skorupska, Auteur Année de publication : 2011 Article en page(s) : pp. 757–764 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Non-ferrous  metallic  ores  Process  optimization  Mineral  economics  Modeling Résumé : The main aim of the paper is to present possible strategies of copper production, which the processing plant can implement, resulting from the technological and economic (market) factors. Such a way of the optimization of copper production process, is considered within the scope of ore extraction, ore concentration and metallurgical processing. The issue is presented on the example of KGHM “Polish Copper” S.A. which operates three mines, three concentrators and two smelters. Each concentrator treats one orebody, producing different bulk concentrates at different recoveries and grades. The effect is to determine the strategy of copper production and such strategy would determine the quality and quantity of concentrates, processed in each of three concentrators in the entire flow-sheet. The routing of the three concentrate streams to the two smelters is optimized using a set of models built with GAMS software. These models consider ore, concentrator process and smelting, and use metal production: (1) or profit maximization (2) as target function. Formulation of a relationship between copper concentrate grade and mass recovery is the major part of introduced model. Limitations determining the maximum copper grades in concentrates as well as relationships between copper grade βCu and silver grade βAg for each concentrate, were also introduced. Theoretical target concentrate grades were estimated for both high and low stock market copper and silver prices. Further sensitivity analysis of model for metal stock market prices and production costs was performed. It was conducted that generally for lower stock market prices, higher concentrate grade should be produced, whilst for the higher metal prices, lower concentrate grade was the optimal strategy. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001469 [article] Technological and economic strategies for the optimization of Polish electrolytic copper production plants [texte imprimé] / D. Saramak, Auteur ; T. Tumidajski, Auteur ; B. Skorupska, Auteur . - 2011 . - pp. 757–764. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 757–764 Mots-clés : Non-ferrous  metallic  ores  Process  optimization  Mineral  economics  Modeling Résumé : The main aim of the paper is to present possible strategies of copper production, which the processing plant can implement, resulting from the technological and economic (market) factors. Such a way of the optimization of copper production process, is considered within the scope of ore extraction, ore concentration and metallurgical processing. The issue is presented on the example of KGHM “Polish Copper” S.A. which operates three mines, three concentrators and two smelters. Each concentrator treats one orebody, producing different bulk concentrates at different recoveries and grades. The effect is to determine the strategy of copper production and such strategy would determine the quality and quantity of concentrates, processed in each of three concentrators in the entire flow-sheet. The routing of the three concentrate streams to the two smelters is optimized using a set of models built with GAMS software. These models consider ore, concentrator process and smelting, and use metal production: (1) or profit maximization (2) as target function. Formulation of a relationship between copper concentrate grade and mass recovery is the major part of introduced model. Limitations determining the maximum copper grades in concentrates as well as relationships between copper grade βCu and silver grade βAg for each concentrate, were also introduced. Theoretical target concentrate grades were estimated for both high and low stock market copper and silver prices. Further sensitivity analysis of model for metal stock market prices and production costs was performed. It was conducted that generally for lower stock market prices, higher concentrate grade should be produced, whilst for the higher metal prices, lower concentrate grade was the optimal strategy. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001469

Use of quaternary ammonium salts to remove copper–cyanide complexes by solvent extraction / O. Alonso-González in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 765–770 Titre : Use of quaternary ammonium salts to remove copper–cyanide complexes by solvent extraction Type de document : texte imprimé Auteurs : O. Alonso-González, Auteur ; F. Nava-Alonso, Auteur ; A. Uribe-Salas, Auteur Année de publication : 2011 Article en page(s) : pp. 765–770 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Copper–cyanide  Copper  removal  Cyanidation  effluents  Solvent  extraction Résumé : Cyanidation is one of the most common methods for the extraction of precious metals. In this process, effluents frequently contain relatively high concentrations of copper, which may react with cyanide to form cuprocyanide complexes adversely affecting the process. In this preliminary work, the use of solvent extraction to remove the copper–cyanide species from a synthetic solution similar to that of gold mill effluents was studied in order to permit the recycling of the solution into the process. For the extraction of these anions, the quaternary ammonium salts Quartamin TPR, Adogen 464 and Aliquat 336 were studied as extractants. The experimental results showed that for a synthetic solution of 710 mg/L copper and 1100 mg/L cyanide, it is possible to obtain a copper extraction of 99% when using 0.033 mol/L of the extractant Adogen 464 (organic/aqueous volume ratio (O/A) = 1) in the range of pH of 9–11. Up to 99% of the copper can be stripped from the organic solution after three contact times (5 min each) with 50 mL of sodium hydroxide 0.5 M (O/A = 1). DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001500 [article] Use of quaternary ammonium salts to remove copper–cyanide complexes by solvent extraction [texte imprimé] / O. Alonso-González, Auteur ; F. Nava-Alonso, Auteur ; A. Uribe-Salas, Auteur . - 2011 . - pp. 765–770. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 765–770 Mots-clés : Copper–cyanide  Copper  removal  Cyanidation  effluents  Solvent  extraction Résumé : Cyanidation is one of the most common methods for the extraction of precious metals. In this process, effluents frequently contain relatively high concentrations of copper, which may react with cyanide to form cuprocyanide complexes adversely affecting the process. In this preliminary work, the use of solvent extraction to remove the copper–cyanide species from a synthetic solution similar to that of gold mill effluents was studied in order to permit the recycling of the solution into the process. For the extraction of these anions, the quaternary ammonium salts Quartamin TPR, Adogen 464 and Aliquat 336 were studied as extractants. The experimental results showed that for a synthetic solution of 710 mg/L copper and 1100 mg/L cyanide, it is possible to obtain a copper extraction of 99% when using 0.033 mol/L of the extractant Adogen 464 (organic/aqueous volume ratio (O/A) = 1) in the range of pH of 9–11. Up to 99% of the copper can be stripped from the organic solution after three contact times (5 min each) with 50 mL of sodium hydroxide 0.5 M (O/A = 1). DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001500

Adsorption of sodium dodecyl benzene sulfonate from aqueous solution using a modified natural zeolite with CTAB / Silvio R. Taffarel in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 771–779 Titre : Adsorption of sodium dodecyl benzene sulfonate from aqueous solution using a modified natural zeolite with CTAB Type de document : texte imprimé Auteurs : Silvio R. Taffarel, Auteur ; Jorge Rubio, Auteur Année de publication : 2011 Article en page(s) : pp. 771–779 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Zeolite  Zeolite  modification  Adsorption  Sodium  dodecyl  benzene  sulfonate  Water  treatment Résumé : This paper describes studies of surface modification of a natural Chilean zeolite with cetyl trimethylammonium bromide (CTAB), to investigate the adsorption efficiency for the removal from aqueous solution of an anionic surfactant, sodium dodecyl benzene sulfonate (SDBS), at bench scale. Modification of the zeolite with CTAB (named ZMS) was based on the external cation exchange capacity (ECEC) of 0.11 meq g−1. The medium pH influences the SDBS ions adsorption rate onto ZMS and the adsorption followed the pseudo-second-order kinetic model. Equilibrium data showed excellent correlation with the Langmuir isotherm model. The adsorption capacities depended on maximum uptakes followed the CTAB concentration or coverage ranging from 40% to 660% of the ECEC. The maximum adsorption capacity of 30.7 mg SDBS g−1 was obtained at 660% of ECEC value. These data contribute for the understanding of mechanisms involved in zeolite modification and provide same practical clues to improve the adsorption efficiency (uptake capacity) of anionic surfactants. Results were discussed in terms of interfacial and solution chemistry phenomena. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001512 [article] Adsorption of sodium dodecyl benzene sulfonate from aqueous solution using a modified natural zeolite with CTAB [texte imprimé] / Silvio R. Taffarel, Auteur ; Jorge Rubio, Auteur . - 2011 . - pp. 771–779. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 771–779 Mots-clés : Zeolite  Zeolite  modification  Adsorption  Sodium  dodecyl  benzene  sulfonate  Water  treatment Résumé : This paper describes studies of surface modification of a natural Chilean zeolite with cetyl trimethylammonium bromide (CTAB), to investigate the adsorption efficiency for the removal from aqueous solution of an anionic surfactant, sodium dodecyl benzene sulfonate (SDBS), at bench scale. Modification of the zeolite with CTAB (named ZMS) was based on the external cation exchange capacity (ECEC) of 0.11 meq g−1. The medium pH influences the SDBS ions adsorption rate onto ZMS and the adsorption followed the pseudo-second-order kinetic model. Equilibrium data showed excellent correlation with the Langmuir isotherm model. The adsorption capacities depended on maximum uptakes followed the CTAB concentration or coverage ranging from 40% to 660% of the ECEC. The maximum adsorption capacity of 30.7 mg SDBS g−1 was obtained at 660% of ECEC value. These data contribute for the understanding of mechanisms involved in zeolite modification and provide same practical clues to improve the adsorption efficiency (uptake capacity) of anionic surfactants. Results were discussed in terms of interfacial and solution chemistry phenomena. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001512

Bonded-particle modelling of microwave-induced damage in ore particles / A.Y. Ali in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 780–790 Titre : Bonded-particle modelling of microwave-induced damage in ore particles Type de document : texte imprimé Auteurs : A.Y. Ali, Auteur ; S. M. Bradshaw, Auteur Année de publication : 2011 Article en page(s) : pp. 780–790 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Discrete  element  modelling  Liberation Résumé : Microwave heating of mineral ores offers a mechanism to induce fractures around grain boundaries due to the different rates of microwave power dissipation and the differences in thermal expansion coefficient among various minerals in the ore particles. As a consequence, this has the potential to reduce the energy required in subsequent grinding and to enhance liberation of valuable minerals. In this paper, numerical simulation using a bonded-particle model was undertaken to provide a better understanding of the mechanism of microwave-induced micro-fracture and to predict the effect of microwave power delivery and ore texture on microwave treatment of ores. Computational simulations of microwave heating and thermal damage have been carried out on two-phase conceptual ores. It was shown that the extent of damage and the crack pattern in an ore sample for the same microwave energy input depend strongly on the applied power density and the microwave absorbent phase grain size. It is possible both to reduce the energy input and to localize the microwave-induced damage around the grain boundaries by operating at high power density. It was also shown that high power pulsed equipment would be more efficient than continuous wave equipment for treating fine-grained ores. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001524 [article] Bonded-particle modelling of microwave-induced damage in ore particles [texte imprimé] / A.Y. Ali, Auteur ; S. M. Bradshaw, Auteur . - 2011 . - pp. 780–790. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 780–790 Mots-clés : Discrete  element  modelling  Liberation Résumé : Microwave heating of mineral ores offers a mechanism to induce fractures around grain boundaries due to the different rates of microwave power dissipation and the differences in thermal expansion coefficient among various minerals in the ore particles. As a consequence, this has the potential to reduce the energy required in subsequent grinding and to enhance liberation of valuable minerals. In this paper, numerical simulation using a bonded-particle model was undertaken to provide a better understanding of the mechanism of microwave-induced micro-fracture and to predict the effect of microwave power delivery and ore texture on microwave treatment of ores. Computational simulations of microwave heating and thermal damage have been carried out on two-phase conceptual ores. It was shown that the extent of damage and the crack pattern in an ore sample for the same microwave energy input depend strongly on the applied power density and the microwave absorbent phase grain size. It is possible both to reduce the energy input and to localize the microwave-induced damage around the grain boundaries by operating at high power density. It was also shown that high power pulsed equipment would be more efficient than continuous wave equipment for treating fine-grained ores. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001524

The development of dynamic models for a dense medium separation circuit in coal beneficiation / E.J. Meyer in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 791–805 Titre : The development of dynamic models for a dense medium separation circuit in coal beneficiation Type de document : texte imprimé Auteurs : E.J. Meyer, Auteur ; I.K. Craig, Auteur Année de publication : 2011 Article en page(s) : pp. 791–805 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Dense  medium  separation  Coal  beneficiation  Dynamic  modelling  Process  control  Simulation  Parameter  identifiability Résumé : Often the most difficult step in establishing a control system is the development of a suitable dynamic process model. As such a model is not available elsewhere, a first principle dynamic mathematical model was developed for a coal dense medium separation circuit. Each unit operation was modelled individually and then integrated together to form a complete non-linear state–space model for the circuit. This model was used to simulate the process and it was validated using real process data derived from a plant experiment. When developing models from first principles, it is necessary to estimate the model parameters. These parameters, specifically for non-linear state–space relationships, require a unique solution. A parameter identifiability method was used to show that the non-linear dynamic models developed have unique parameters for a specific set of input–output data. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001536 [article] The development of dynamic models for a dense medium separation circuit in coal beneficiation [texte imprimé] / E.J. Meyer, Auteur ; I.K. Craig, Auteur . - 2011 . - pp. 791–805. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 791–805 Mots-clés : Dense  medium  separation  Coal  beneficiation  Dynamic  modelling  Process  control  Simulation  Parameter  identifiability Résumé : Often the most difficult step in establishing a control system is the development of a suitable dynamic process model. As such a model is not available elsewhere, a first principle dynamic mathematical model was developed for a coal dense medium separation circuit. Each unit operation was modelled individually and then integrated together to form a complete non-linear state–space model for the circuit. This model was used to simulate the process and it was validated using real process data derived from a plant experiment. When developing models from first principles, it is necessary to estimate the model parameters. These parameters, specifically for non-linear state–space relationships, require a unique solution. A parameter identifiability method was used to show that the non-linear dynamic models developed have unique parameters for a specific set of input–output data. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001536

Efficiency of automated sorter performance based on particle proximity information / R.D. Pascoe in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 806–812 Titre : Efficiency of automated sorter performance based on particle proximity information Type de document : texte imprimé Auteurs : R.D. Pascoe, Auteur ; O. B. Udoudo, Auteur ; H.J. Glass, Auteur Année de publication : 2011 Article en page(s) : pp. 806–812 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sorting  methods  Modelling  Mineral  processing Résumé : The accurate prediction of automated sorter performance is important for the future application of this technology in the minerals industry. While it is known that sorter capacity increases with particle size, a method for predicting separation efficiency is not currently available in the literature. The separation efficiency depends on material properties, feed presentation and machine properties. In this study, we have undertaken colour separation of two materials chosen for their ease of identification using a TiTech Combisense® (BSM 063) automated sorter. Sorter performance was compared to particle proximity data obtained from the on-board counter of the automated sorter. Given the choice of feed materials, any inefficiency in sorter operation is related to the efficiency of selective air ejection which, in turn, is affected by feed presentation, feed size, compressed air valves characteristics as well as the sensitivity of the sorter. Deflection efficiency can be influenced by particle trajectories, precision of the air ejection system and the sensitivity of the sensors. The precision of ejection was also found to be an important factor with the unintentional removal of “accept” particles caused by their close proximity to particles being rejected. It was found that this loss of efficiency could be explained by “touching” particles forming aggregated groups at the identification point. An increase in throughput and a decrease in particle thickness were shown to increase the probability of finding these aggregates. As the fraction of particles to be deflected increases there is an increased probability of finding both “accept” and “deflect” particles within an aggregate and therefore an increased probability of co-deflection. A simple model for predicting the efficiency of our automated sorting system (assuming perfect identification) is presented which has only two variables, % belt loading and the fraction to be deflected. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001548 [article] Efficiency of automated sorter performance based on particle proximity information [texte imprimé] / R.D. Pascoe, Auteur ; O. B. Udoudo, Auteur ; H.J. Glass, Auteur . - 2011 . - pp. 806–812. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 806–812 Mots-clés : Sorting  methods  Modelling  Mineral  processing Résumé : The accurate prediction of automated sorter performance is important for the future application of this technology in the minerals industry. While it is known that sorter capacity increases with particle size, a method for predicting separation efficiency is not currently available in the literature. The separation efficiency depends on material properties, feed presentation and machine properties. In this study, we have undertaken colour separation of two materials chosen for their ease of identification using a TiTech Combisense® (BSM 063) automated sorter. Sorter performance was compared to particle proximity data obtained from the on-board counter of the automated sorter. Given the choice of feed materials, any inefficiency in sorter operation is related to the efficiency of selective air ejection which, in turn, is affected by feed presentation, feed size, compressed air valves characteristics as well as the sensitivity of the sorter. Deflection efficiency can be influenced by particle trajectories, precision of the air ejection system and the sensitivity of the sensors. The precision of ejection was also found to be an important factor with the unintentional removal of “accept” particles caused by their close proximity to particles being rejected. It was found that this loss of efficiency could be explained by “touching” particles forming aggregated groups at the identification point. An increase in throughput and a decrease in particle thickness were shown to increase the probability of finding these aggregates. As the fraction of particles to be deflected increases there is an increased probability of finding both “accept” and “deflect” particles within an aggregate and therefore an increased probability of co-deflection. A simple model for predicting the efficiency of our automated sorting system (assuming perfect identification) is presented which has only two variables, % belt loading and the fraction to be deflected. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001548

The effect of an external magnetic field on cationic flotation of quartz from magnetite / Mustafa Birinci in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 813–818 Titre : The effect of an external magnetic field on cationic flotation of quartz from magnetite Type de document : texte imprimé Auteurs : Mustafa Birinci, Auteur ; Jan D. Miller, Auteur ; Musa Sarıkaya, Auteur Année de publication : 2011 Article en page(s) : pp. 813–818 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : External  magnetic  field  Magnetic  flotation  Quartz  Magnetite Résumé : In this study, the effect of an external magnetic field on cationic flotation of quartz from magnetite was investigated by using a magnetic micro-flotation column. For this purpose, a micro-flotation column jacketed with three coils was fabricated to create a funnel-shaped magnetic field. Both the theoretical magnetic field strengths and the magnetic forces were calculated. The results from flotation experiments with 6 × 10−5 M dodecylamine as collector using a binary mixture of quartz and magnetite as a feed material show that the separation efficiency increased from 0% without the magnetic field to 88% in the presence of the magnetic field. The significant enhancement in separation efficiency is evident. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268751000155X [article] The effect of an external magnetic field on cationic flotation of quartz from magnetite [texte imprimé] / Mustafa Birinci, Auteur ; Jan D. Miller, Auteur ; Musa Sarıkaya, Auteur . - 2011 . - pp. 813–818. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 813–818 Mots-clés : External  magnetic  field  Magnetic  flotation  Quartz  Magnetite Résumé : In this study, the effect of an external magnetic field on cationic flotation of quartz from magnetite was investigated by using a magnetic micro-flotation column. For this purpose, a micro-flotation column jacketed with three coils was fabricated to create a funnel-shaped magnetic field. Both the theoretical magnetic field strengths and the magnetic forces were calculated. The results from flotation experiments with 6 × 10−5 M dodecylamine as collector using a binary mixture of quartz and magnetite as a feed material show that the separation efficiency increased from 0% without the magnetic field to 88% in the presence of the magnetic field. The significant enhancement in separation efficiency is evident. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268751000155X

Solubilization of heavy metals from gold ore by adjuvants used during gold phytomining / Stephen D. Ebbs in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 819–822 Titre : Solubilization of heavy metals from gold ore by adjuvants used during gold phytomining Type de document : texte imprimé Auteurs : Stephen D. Ebbs, Auteur ; Spas D. Kolev, Auteur ; Robert C.R. Piccinin, Auteur Année de publication : 2011 Article en page(s) : pp. 819–822 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Gold  ores  Leaching  Pollution  Environmental Résumé : Adjuvants such as cyanide, thiocyanate, and thiosulfate are applied to gold-bearing ores to increase gold solubility and plant uptake of gold during phytomining. The influence of these three adjuvants, added at rates comparable to field application (1 g kg DW−1 ore), on the leaching of heavy metals from gold ore from the Davis stockpile at the Stawell Gold Mines was examined in batch and column studies. The overall goal was to provide data that specifically addressed the possible collateral impacts that could occur during adjuvant-assisted phytomining in terms of heavy metal solubilization and leaching. Leachate from the cyanide-amended ore had the highest concentrations of Au, Co, Cu, and Ni, with the Au concentration representing ∼22% of the total gold present. Thiosulfate-amended ore leached the highest Fe concentration while thiocyanate-amended ore leached the highest Al and Zn concentrations. The results suggest that for this ore, while these adjuvants are present, there is the potential for the mobilization of undesirable elements and Au out of the ore and potentially into groundwater unless adequate hydraulic controls are implemented following adjuvant addition. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001561 [article] Solubilization of heavy metals from gold ore by adjuvants used during gold phytomining [texte imprimé] / Stephen D. Ebbs, Auteur ; Spas D. Kolev, Auteur ; Robert C.R. Piccinin, Auteur . - 2011 . - pp. 819–822. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 819–822 Mots-clés : Gold  ores  Leaching  Pollution  Environmental Résumé : Adjuvants such as cyanide, thiocyanate, and thiosulfate are applied to gold-bearing ores to increase gold solubility and plant uptake of gold during phytomining. The influence of these three adjuvants, added at rates comparable to field application (1 g kg DW−1 ore), on the leaching of heavy metals from gold ore from the Davis stockpile at the Stawell Gold Mines was examined in batch and column studies. The overall goal was to provide data that specifically addressed the possible collateral impacts that could occur during adjuvant-assisted phytomining in terms of heavy metal solubilization and leaching. Leachate from the cyanide-amended ore had the highest concentrations of Au, Co, Cu, and Ni, with the Au concentration representing ∼22% of the total gold present. Thiosulfate-amended ore leached the highest Fe concentration while thiocyanate-amended ore leached the highest Al and Zn concentrations. The results suggest that for this ore, while these adjuvants are present, there is the potential for the mobilization of undesirable elements and Au out of the ore and potentially into groundwater unless adequate hydraulic controls are implemented following adjuvant addition. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001561

Ionic liquid-based modified cold-induced aggregation microextraction (M-CIAME) as a novel solvent extraction method for determination of gold in saline solutions / Shokouh Mahpishanian in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 823–825 Titre : Ionic liquid-based modified cold-induced aggregation microextraction (M-CIAME) as a novel solvent extraction method for determination of gold in saline solutions Type de document : texte imprimé Auteurs : Shokouh Mahpishanian, Auteur ; Farzaneh Shemirani, Auteur Année de publication : 2011 Article en page(s) : pp. 823–825 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Solvent  extraction  Gold  Environmental  samples Résumé : Modified-cold-induced aggregation microextraction (M-CIAME) was used for determination of gold in saline solutions. It is robust against the much higher concentration of salt (up to 40%). In this method sodium hexafluorophosphate (NaPF6) was added to the sample solution containing Au-TMK complex and a very small amount of 1-hexyl-3-methylimidazolium tetrafluoroborate [Hmim][BF4]. Afterward the solution was cooled in an ice bath and a cloudy solution was formed. After centrifuging, the extractant phase was analyzed using a spectrophotometric detection method. Under the optimum conditions, the limit of detection (LOD) was 0.7 ng mL−1 and the relative standard deviation (RSD) was 1.65% for 50 ng mL−1 gold. The method was applied for the determination of trace amount of Au in mineral and seawater with satisfactory results. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001433 [article] Ionic liquid-based modified cold-induced aggregation microextraction (M-CIAME) as a novel solvent extraction method for determination of gold in saline solutions [texte imprimé] / Shokouh Mahpishanian, Auteur ; Farzaneh Shemirani, Auteur . - 2011 . - pp. 823–825. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 823–825 Mots-clés : Solvent  extraction  Gold  Environmental  samples Résumé : Modified-cold-induced aggregation microextraction (M-CIAME) was used for determination of gold in saline solutions. It is robust against the much higher concentration of salt (up to 40%). In this method sodium hexafluorophosphate (NaPF6) was added to the sample solution containing Au-TMK complex and a very small amount of 1-hexyl-3-methylimidazolium tetrafluoroborate [Hmim][BF4]. Afterward the solution was cooled in an ice bath and a cloudy solution was formed. After centrifuging, the extractant phase was analyzed using a spectrophotometric detection method. Under the optimum conditions, the limit of detection (LOD) was 0.7 ng mL−1 and the relative standard deviation (RSD) was 1.65% for 50 ng mL−1 gold. The method was applied for the determination of trace amount of Au in mineral and seawater with satisfactory results. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001433

A continuous pilot-scale flotation rig for the systematic study of flotation variables / S.D.D. Welsby in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 826–829 Titre : A continuous pilot-scale flotation rig for the systematic study of flotation variables Type de document : texte imprimé Auteurs : S.D.D. Welsby, Auteur ; S.M.S.M. Vianna, Auteur ; J.-P. Franzidis, Auteur Année de publication : 2011 Article en page(s) : pp. 826–829 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation  kinetics  Flotation  machines  Sampling Résumé : A pilot-scale flotation apparatus has been developed for the purpose of determining floatability parameters for an ore. It has the capability to vary many of the important flotation variables allowing them to be investigated independently. Adjustable factors include: cell size, froth depth, feed, tailings and air volumetric flow rates and reagent addition rates. The flotation rig was commissioned successfully at BHP Billiton’s Cannington mine in North-West Queensland, Australia. It was found to supply a stable feed stream with air well distributed across the cell. At the test conditions, the relative standard deviation of the calculated galena overall recovery was found to be only 1%. Such an apparatus could prove invaluable in flotation research, allowing live streams from an operating industrial flotation plant to be processed continuously. The versatility of the design and accuracy of performance allow the investigation of most major flotation variables with confidence. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001470 [article] A continuous pilot-scale flotation rig for the systematic study of flotation variables [texte imprimé] / S.D.D. Welsby, Auteur ; S.M.S.M. Vianna, Auteur ; J.-P. Franzidis, Auteur . - 2011 . - pp. 826–829. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 826–829 Mots-clés : Flotation  kinetics  Flotation  machines  Sampling Résumé : A pilot-scale flotation apparatus has been developed for the purpose of determining floatability parameters for an ore. It has the capability to vary many of the important flotation variables allowing them to be investigated independently. Adjustable factors include: cell size, froth depth, feed, tailings and air volumetric flow rates and reagent addition rates. The flotation rig was commissioned successfully at BHP Billiton’s Cannington mine in North-West Queensland, Australia. It was found to supply a stable feed stream with air well distributed across the cell. At the test conditions, the relative standard deviation of the calculated galena overall recovery was found to be only 1%. Such an apparatus could prove invaluable in flotation research, allowing live streams from an operating industrial flotation plant to be processed continuously. The versatility of the design and accuracy of performance allow the investigation of most major flotation variables with confidence. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001470

Synthesis and collecting properties of novel carboxyl hydroxamic acids for diaspore and aluminosilicate minerals / Jiang Yu-ren in Minerals engineering, Vol. 23 N° 10 (Septembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 830–832 Titre : Synthesis and collecting properties of novel carboxyl hydroxamic acids for diaspore and aluminosilicate minerals Type de document : texte imprimé Auteurs : Jiang Yu-ren, Auteur ; Yin Zhi-gang, Auteur ; Yi Yun-lai, Auteur Année de publication : 2011 Article en page(s) : pp. 830–832 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Collector  Flotation  behavior  Adsorption  mechanism  Diaspore  Aluminosilicate  mineral Résumé : Novel carboxyl hydroxamic acids compounds, including 2-carboxyl-6-methylcyclohexane carboxamic acid (CMCA), 2-carboxymethyl-decylen-4-yl hydroxamic acid (CDHA), and 2-carboxymethyl-tetradecen-4-yl hydroxamic acid (CTHA) were synthesized, and the flotation behaviors of diaspore, kaolinite and illite were investigated by using these compounds as collectors. The adsorption mechanism of CTHA on the surface of diaspore, kaolinite and illite was conducted by zeta-potential, adsorption amount and FTIR spectra measurement. The interaction of CTHA on the diaspore surface may be mainly dominated by the chemical adsorption; however, the adsorption of CTHA on kaolinite or illite is mainly dominated by the physical one. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001494 [article] Synthesis and collecting properties of novel carboxyl hydroxamic acids for diaspore and aluminosilicate minerals [texte imprimé] / Jiang Yu-ren, Auteur ; Yin Zhi-gang, Auteur ; Yi Yun-lai, Auteur . - 2011 . - pp. 830–832. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 10 (Septembre 2010) . - pp. 830–832 Mots-clés : Collector  Flotation  behavior  Adsorption  mechanism  Diaspore  Aluminosilicate  mineral Résumé : Novel carboxyl hydroxamic acids compounds, including 2-carboxyl-6-methylcyclohexane carboxamic acid (CMCA), 2-carboxymethyl-decylen-4-yl hydroxamic acid (CDHA), and 2-carboxymethyl-tetradecen-4-yl hydroxamic acid (CTHA) were synthesized, and the flotation behaviors of diaspore, kaolinite and illite were investigated by using these compounds as collectors. The adsorption mechanism of CTHA on the surface of diaspore, kaolinite and illite was conducted by zeta-potential, adsorption amount and FTIR spectra measurement. The interaction of CTHA on the diaspore surface may be mainly dominated by the chemical adsorption; however, the adsorption of CTHA on kaolinite or illite is mainly dominated by the physical one. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001494

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