Dépouillements

Bioremediation of acid-rock drainage by sulphate-reducing prokaryotes / A.S. Sheoran in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1073–1100 Titre : Bioremediation of acid-rock drainage by sulphate-reducing prokaryotes : A review Type de document : texte imprimé Auteurs : A.S. Sheoran, Auteur ; V. Sheoran, Auteur ; R. P. Choudhary, Auteur Année de publication : 2011 Article en page(s) : pp. 1073–1100 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mining  Sulphide  ores  Acid-rock  drainage  Reclamation  Bacteria Résumé : Acid-rock drainage (ARD) is a widespread environmental problem that causes adverse effects to the quality of ground water and surface water through acidification, high concentration of the iron, sulphate, and elevated levels of soluble toxic metals. Active treatment technologies are often expensive and require regular attention resulting in increased overall costs due to operation and maintenance expenses. One of the effective treatment methods is to use sulphate-reducing prokaryotes (SRP) in bioreactors. They offer advantages such as high metal removal at low pH, stable sludge, very low operation costs, and minimal energy consumption. Sulphide precipitation is the desired mechanism of contaminant removal; however, many mechanisms including adsorption and precipitation of metal carbonates and hydroxides also occur in passive bioreactors. Several factors influencing the performance of the bioreactors are reviewed. The fundamental biochemical and microbiological reactions that occurs in the bioreactors has been dealt in detail. The present review presents performance of bioreactors, chemical characterisation of organic substrates for successful treatment of ARD. Moreover, design parameters, longevity and future scope of the study on bioreactors is also discussed in this review. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001664 [article] Bioremediation of acid-rock drainage by sulphate-reducing prokaryotes : A review [texte imprimé] / A.S. Sheoran, Auteur ; V. Sheoran, Auteur ; R. P. Choudhary, Auteur . - 2011 . - pp. 1073–1100. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1073–1100 Mots-clés : Mining  Sulphide  ores  Acid-rock  drainage  Reclamation  Bacteria Résumé : Acid-rock drainage (ARD) is a widespread environmental problem that causes adverse effects to the quality of ground water and surface water through acidification, high concentration of the iron, sulphate, and elevated levels of soluble toxic metals. Active treatment technologies are often expensive and require regular attention resulting in increased overall costs due to operation and maintenance expenses. One of the effective treatment methods is to use sulphate-reducing prokaryotes (SRP) in bioreactors. They offer advantages such as high metal removal at low pH, stable sludge, very low operation costs, and minimal energy consumption. Sulphide precipitation is the desired mechanism of contaminant removal; however, many mechanisms including adsorption and precipitation of metal carbonates and hydroxides also occur in passive bioreactors. Several factors influencing the performance of the bioreactors are reviewed. The fundamental biochemical and microbiological reactions that occurs in the bioreactors has been dealt in detail. The present review presents performance of bioreactors, chemical characterisation of organic substrates for successful treatment of ARD. Moreover, design parameters, longevity and future scope of the study on bioreactors is also discussed in this review. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001664

Coupling oxidation to transient drying during multilayer deposition of thickened gold tailings / Rachel Bryan in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1101–1112 Titre : Coupling oxidation to transient drying during multilayer deposition of thickened gold tailings Type de document : texte imprimé Auteurs : Rachel Bryan, Auteur ; Paul Simms, Auteur ; Rens Verburg, Auteur Année de publication : 2011 Article en page(s) : pp. 1101–1112 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Tailings  disposal  Thickening  Oxidation  Sulfide  ores  Acid  rock  drainage Résumé : Dewatering tailings prior to deposition is an attractive alternative to conventional practice, as it minimizes the use of embankments and therefore reduces the risk of catastrophic failure associated with dammed slurry impoundments. One of the potential detriments is the absence of a water cover and the consequent increase in oxygen ingress and generation of acid drainage. This paper investigates the amount of oxidation that occurs in shallow layers of desiccating gold tailings during deposition. Oxidation is modelled by coupling transient predictions of unsaturated flow to predictions of oxygen diffusive transport and consumption. A first-order rate law is adopted to model oxidation. Coupling is accomplished through the dependency of oxygen diffusivity on degree of saturation. Experiments and numerical predictions agree within the order of the measurement error, despite the relative simplicity of the oxygen consumption model. Though these tailings crack, the cracks do not influence the drying behaviour, nor do they significantly influence the horizontal distribution of oxidation. The modelling method is applied to the case of a fresh layer of tailings deposited over a deep stack. This analysis shows that some oxidation will occur during deposition of a fresh layer of thickened tailings, and the rate of drying and oxidation is strongly influenced by the underlying previously-deposited tailings. It is also illustrated how drying time to achieve a given density, and consequently oxidation, can be limited by hydraulically decoupling a fresh layer from the underlying stack using a capillary break. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268751000172X [article] Coupling oxidation to transient drying during multilayer deposition of thickened gold tailings [texte imprimé] / Rachel Bryan, Auteur ; Paul Simms, Auteur ; Rens Verburg, Auteur . - 2011 . - pp. 1101–1112. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1101–1112 Mots-clés : Tailings  disposal  Thickening  Oxidation  Sulfide  ores  Acid  rock  drainage Résumé : Dewatering tailings prior to deposition is an attractive alternative to conventional practice, as it minimizes the use of embankments and therefore reduces the risk of catastrophic failure associated with dammed slurry impoundments. One of the potential detriments is the absence of a water cover and the consequent increase in oxygen ingress and generation of acid drainage. This paper investigates the amount of oxidation that occurs in shallow layers of desiccating gold tailings during deposition. Oxidation is modelled by coupling transient predictions of unsaturated flow to predictions of oxygen diffusive transport and consumption. A first-order rate law is adopted to model oxidation. Coupling is accomplished through the dependency of oxygen diffusivity on degree of saturation. Experiments and numerical predictions agree within the order of the measurement error, despite the relative simplicity of the oxygen consumption model. Though these tailings crack, the cracks do not influence the drying behaviour, nor do they significantly influence the horizontal distribution of oxidation. The modelling method is applied to the case of a fresh layer of tailings deposited over a deep stack. This analysis shows that some oxidation will occur during deposition of a fresh layer of thickened tailings, and the rate of drying and oxidation is strongly influenced by the underlying previously-deposited tailings. It is also illustrated how drying time to achieve a given density, and consequently oxidation, can be limited by hydraulically decoupling a fresh layer from the underlying stack using a capillary break. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268751000172X

Interfacial phenomena in the sulfur–polytetrafluoroethylene system under hydrothermal conditions / Reuben J. Mathew in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1113–1119 Titre : Interfacial phenomena in the sulfur–polytetrafluoroethylene system under hydrothermal conditions Type de document : texte imprimé Auteurs : Reuben J. Mathew, Auteur ; Vladimiros G. Papangelakis, Auteur ; Eduard Guerra, Auteur Année de publication : 2011 Article en page(s) : pp. 1113–1119 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulphide  ores  Fine  particle  processing  Leaching  Hydrometallurgy  Surface  modification Résumé : Sulfur occlusion of pyrite particles during oxidative pressure leaching of mineral sulfide concentrates at temperatures below 160 °C has a deleterious effect on pyrite oxidation kinetics. Existing techniques in mitigating sulfur occlusion involve the use of surfactants or operation at temperatures above 160 °C which are a burden to the process economy. This study looks at the suitability of polytetrafluoroethylene (PTFE) to act as a solid sorbent for the liquid sulfur generated during the pressure leach process. The suitability of PTFE as a solid sorbent was determined by comparing interfacial phenomena in the corresponding sulfur–PTFE–leach and sulfur–mineral–leach systems. The work of adhesion in a sulfur–PTFE system was calculated using the interfacial tension and contact angle measured in the relevant sulfur–PTFE system, which is comparable to published values in the pyrite–sulfur system. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001731 [article] Interfacial phenomena in the sulfur–polytetrafluoroethylene system under hydrothermal conditions [texte imprimé] / Reuben J. Mathew, Auteur ; Vladimiros G. Papangelakis, Auteur ; Eduard Guerra, Auteur . - 2011 . - pp. 1113–1119. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1113–1119 Mots-clés : Sulphide  ores  Fine  particle  processing  Leaching  Hydrometallurgy  Surface  modification Résumé : Sulfur occlusion of pyrite particles during oxidative pressure leaching of mineral sulfide concentrates at temperatures below 160 °C has a deleterious effect on pyrite oxidation kinetics. Existing techniques in mitigating sulfur occlusion involve the use of surfactants or operation at temperatures above 160 °C which are a burden to the process economy. This study looks at the suitability of polytetrafluoroethylene (PTFE) to act as a solid sorbent for the liquid sulfur generated during the pressure leach process. The suitability of PTFE as a solid sorbent was determined by comparing interfacial phenomena in the corresponding sulfur–PTFE–leach and sulfur–mineral–leach systems. The work of adhesion in a sulfur–PTFE system was calculated using the interfacial tension and contact angle measured in the relevant sulfur–PTFE system, which is comparable to published values in the pyrite–sulfur system. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001731

A DFT study on the effect of lattice impurities on the electronic structures and floatability of sphalerite / Ye Chen in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1120–1130 Titre : A DFT study on the effect of lattice impurities on the electronic structures and floatability of sphalerite Type de document : texte imprimé Auteurs : Ye Chen, Auteur ; Jianhua Chen, Auteur ; Jin Guo, Auteur Année de publication : 2011 Article en page(s) : pp. 1120–1130 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulfide  ores  Froth  flotation  Simulation Résumé : The electronic structures of bulk sphalerite containing 14 typical kinds of impurities were studied by density-functional theory (DFT). The calculated results show that the presence of Cd, Hg, Ga, Ge, In, Ag, Sn, Pb and Sb could increase the lattice parameter of sphalerite. Ag, Sn, Pb, Sb, Cd and Hg impurities narrowed the band-gap and increased the conductivity of sphalerite. Moreover, Mn, Fe, Ga, In, Sn and Sb impurities changed the semiconductor type of sphalerite from p-type to n-type. All of the impurities except Cd and Hg made the Fermi level shift to higher energy and led to the occurrence of an impurity state in the forbidden band. Analysis of the frontier molecular orbital showed that the impurities Mn, Fe, Cu, Ge, Sn, Pb and Sb contributed greatly to the highest occupied molecular orbital (HOMO) and greatly influence the nucleophilicity of sphalerite. On the other hand, the impurities of Fe, Cu, Co, Ni, Cd and Ga greatly contributed to the lowest unoccupied molecular orbital (LUMO) and greatly affected the electrophilicity of sphalerite. The interactions of O2 and xanthate with sphalerite are discussed. Results suggest that Mn, Fe, Ni, Cu, Sn and Pb impurities favored the oxidization of sphalerite; however, the impurities of Cd, Hg, Ga and In had the opposite effect. Impurities of Mn, Fe, Co, Ni, Cu, Hg and Pb could enhance the reactivity of xanthate with sphalerite. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001743 [article] A DFT study on the effect of lattice impurities on the electronic structures and floatability of sphalerite [texte imprimé] / Ye Chen, Auteur ; Jianhua Chen, Auteur ; Jin Guo, Auteur . - 2011 . - pp. 1120–1130. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1120–1130 Mots-clés : Sulfide  ores  Froth  flotation  Simulation Résumé : The electronic structures of bulk sphalerite containing 14 typical kinds of impurities were studied by density-functional theory (DFT). The calculated results show that the presence of Cd, Hg, Ga, Ge, In, Ag, Sn, Pb and Sb could increase the lattice parameter of sphalerite. Ag, Sn, Pb, Sb, Cd and Hg impurities narrowed the band-gap and increased the conductivity of sphalerite. Moreover, Mn, Fe, Ga, In, Sn and Sb impurities changed the semiconductor type of sphalerite from p-type to n-type. All of the impurities except Cd and Hg made the Fermi level shift to higher energy and led to the occurrence of an impurity state in the forbidden band. Analysis of the frontier molecular orbital showed that the impurities Mn, Fe, Cu, Ge, Sn, Pb and Sb contributed greatly to the highest occupied molecular orbital (HOMO) and greatly influence the nucleophilicity of sphalerite. On the other hand, the impurities of Fe, Cu, Co, Ni, Cd and Ga greatly contributed to the lowest unoccupied molecular orbital (LUMO) and greatly affected the electrophilicity of sphalerite. The interactions of O2 and xanthate with sphalerite are discussed. Results suggest that Mn, Fe, Ni, Cu, Sn and Pb impurities favored the oxidization of sphalerite; however, the impurities of Cd, Hg, Ga and In had the opposite effect. Impurities of Mn, Fe, Co, Ni, Cu, Hg and Pb could enhance the reactivity of xanthate with sphalerite. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001743

Removal of Mn2+ from aqueous solution by manganese oxide coated zeolite / Silvio R. Taffarel in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1131–1138 Titre : Removal of Mn2+ from aqueous solution by manganese oxide coated zeolite Type de document : texte imprimé Auteurs : Silvio R. Taffarel, Auteur ; Jorge Rubio, Auteur Année de publication : 2011 Article en page(s) : pp. 1131–1138 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Zeolite  Manganese  oxide  Adsorption  Metal  ions  Water  treatment Résumé : The preparation, characterization, and adsorption properties of Mn2+ by manganese oxide coated zeolite (MOCZ) and its ability in removing Mn2+ by adsorption were investigated. Characterization analyses were used to monitor the surface properties (and their changes) of the coated layer and metal adsorption sites on the surface of MOCZ. The adsorption experiments were carried out as a function of solution pH, adsorbent concentration and contact time. Binding of Mn2+ ions onto MOCZ was highly pH dependent with an increase in the extent of adsorption with the pH of the media investigated. After the Mn2+ adsorption by MOCZ, the medium pH decreased and enhanced with increasing adsorbent concentration. The pseudo-second-order model fitted better among all the kinetic models suggesting that the adsorption mechanism might be a chemisorption process. The equilibrium data showed excellent correlation for both Langmuir and Freundlich isotherm model and this implies both monolayer adsorption and a heterogeneous surface existence in MOCZ. At pH = 6, the Mn2+ uptake by MOCZ attained as high as 1.1 meq Mn2+ g−1 at equilibrium. The results suggested that MOCZ presents a fairly good potential as an adsorbent for an efficient removal of Mn2+ ions from aqueous solution. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001767 [article] Removal of Mn2+ from aqueous solution by manganese oxide coated zeolite [texte imprimé] / Silvio R. Taffarel, Auteur ; Jorge Rubio, Auteur . - 2011 . - pp. 1131–1138. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1131–1138 Mots-clés : Zeolite  Manganese  oxide  Adsorption  Metal  ions  Water  treatment Résumé : The preparation, characterization, and adsorption properties of Mn2+ by manganese oxide coated zeolite (MOCZ) and its ability in removing Mn2+ by adsorption were investigated. Characterization analyses were used to monitor the surface properties (and their changes) of the coated layer and metal adsorption sites on the surface of MOCZ. The adsorption experiments were carried out as a function of solution pH, adsorbent concentration and contact time. Binding of Mn2+ ions onto MOCZ was highly pH dependent with an increase in the extent of adsorption with the pH of the media investigated. After the Mn2+ adsorption by MOCZ, the medium pH decreased and enhanced with increasing adsorbent concentration. The pseudo-second-order model fitted better among all the kinetic models suggesting that the adsorption mechanism might be a chemisorption process. The equilibrium data showed excellent correlation for both Langmuir and Freundlich isotherm model and this implies both monolayer adsorption and a heterogeneous surface existence in MOCZ. At pH = 6, the Mn2+ uptake by MOCZ attained as high as 1.1 meq Mn2+ g−1 at equilibrium. The results suggested that MOCZ presents a fairly good potential as an adsorbent for an efficient removal of Mn2+ ions from aqueous solution. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001767

Biomass for iron ore sintering / Mohammad Zandi in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1139–1145 Titre : Biomass for iron ore sintering Type de document : texte imprimé Auteurs : Mohammad Zandi, Auteur ; Maria Martinez-Pacheco, Auteur ; Trevor A.T. Fray, Auteur Année de publication : 2011 Article en page(s) : pp. 1139–1145 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sintering  Sinter  pot  Agglomeration  Biomass  Iron  ore  Renewable  energy Résumé : Within an integrated steelworks, iron ore sinter making is an energy intensive process. In recent years, biomass is becoming an attractive alternative source of energy to traditional fossil fuels such as coal. In this study, commercially available biomass materials suited to sinter making have been identified as an alternative source of fuel to coke breeze. Olive residues, sunflower husk pellets, almond shells, hazelnut shells and Bagasse pellets have been characterised and prepared for sintering. A laboratory sinter pot has been employed for studying sintering behaviour of biomass material. On average, the calorific values of selected biomass materials, on a dry basis, are about 65% of dry coke breeze. It was found that less of this energy would be available in sinter making due to the evaporation of some of the volatile matter ahead of the flame front. At a replacement rate of 25%, the crushed sunflower husk pellets showed the closest thermal profile to that of coke breeze alone in the size range of −0.8 to +0.6 mm. A specification of less than 1 mm has been recommended for the studied biomass materials when co-firing biomass with coke breeze for iron ore sintering. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001792 [article] Biomass for iron ore sintering [texte imprimé] / Mohammad Zandi, Auteur ; Maria Martinez-Pacheco, Auteur ; Trevor A.T. Fray, Auteur . - 2011 . - pp. 1139–1145. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1139–1145 Mots-clés : Sintering  Sinter  pot  Agglomeration  Biomass  Iron  ore  Renewable  energy Résumé : Within an integrated steelworks, iron ore sinter making is an energy intensive process. In recent years, biomass is becoming an attractive alternative source of energy to traditional fossil fuels such as coal. In this study, commercially available biomass materials suited to sinter making have been identified as an alternative source of fuel to coke breeze. Olive residues, sunflower husk pellets, almond shells, hazelnut shells and Bagasse pellets have been characterised and prepared for sintering. A laboratory sinter pot has been employed for studying sintering behaviour of biomass material. On average, the calorific values of selected biomass materials, on a dry basis, are about 65% of dry coke breeze. It was found that less of this energy would be available in sinter making due to the evaporation of some of the volatile matter ahead of the flame front. At a replacement rate of 25%, the crushed sunflower husk pellets showed the closest thermal profile to that of coke breeze alone in the size range of −0.8 to +0.6 mm. A specification of less than 1 mm has been recommended for the studied biomass materials when co-firing biomass with coke breeze for iron ore sintering. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001792

Thermal insulating foamy geopolymers from perlite / V. Vaou in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1146–1151 Titre : Thermal insulating foamy geopolymers from perlite Type de document : texte imprimé Auteurs : V. Vaou, Auteur ; D. Panias, Auteur Année de publication : 2011 Article en page(s) : pp. 1146–1151 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Geopolymers  Perlite  Thermal  insulation  Inorganic  foams Résumé : Geopolymerization is an emerging technology which utilizes solid aluminosilicate raw materials that are easily soluble in caustic solutions, in order to produce inorganic polymers with excellent physical, mechanical and thermal properties. In this paper is demonstrated the ability of geopolymerization technology for production of thermal insulating foamy inorganic polymers utilizing as solid raw material ultrafine perlite which is a by-product from comminution and sizing operations of perlite exploitation. Hydrogen peroxide is used as a chemical blowing agent for the foaming of inorganic polymers. The effect of addition of the blowing agent on the thermophysical properties of thermal insulating materials is demonstrated and these properties are compared with the ones of the commercial thermal insulating materials indicating the high potentiality for the development of this new family of inorganic polymeric materials. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001962 [article] Thermal insulating foamy geopolymers from perlite [texte imprimé] / V. Vaou, Auteur ; D. Panias, Auteur . - 2011 . - pp. 1146–1151. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1146–1151 Mots-clés : Geopolymers  Perlite  Thermal  insulation  Inorganic  foams Résumé : Geopolymerization is an emerging technology which utilizes solid aluminosilicate raw materials that are easily soluble in caustic solutions, in order to produce inorganic polymers with excellent physical, mechanical and thermal properties. In this paper is demonstrated the ability of geopolymerization technology for production of thermal insulating foamy inorganic polymers utilizing as solid raw material ultrafine perlite which is a by-product from comminution and sizing operations of perlite exploitation. Hydrogen peroxide is used as a chemical blowing agent for the foaming of inorganic polymers. The effect of addition of the blowing agent on the thermophysical properties of thermal insulating materials is demonstrated and these properties are compared with the ones of the commercial thermal insulating materials indicating the high potentiality for the development of this new family of inorganic polymeric materials. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001962

Simplified cloud point extraction-inductively coupled plasma mass spectrometry for the preconcentration/analysis of ultra-trace gold / Songqing Chen in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1152–1154 Titre : Simplified cloud point extraction-inductively coupled plasma mass spectrometry for the preconcentration/analysis of ultra-trace gold Type de document : texte imprimé Auteurs : Songqing Chen, Auteur ; Xiashi Zhu, Auteur Année de publication : 2011 Article en page(s) : pp. 1152–1154 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Gold  Triton  X-114  Cloud  point  extraction  Inductively  coupled  plasma  mass  spectrometry Résumé : A new cloud point extraction method for the preconcentration of ultra-trace gold as a prior step to its determination by inductively coupled plasma mass spectrometry (ICP-MS) has been developed. The method is based on the cloud point extraction (CPE) of gold in the non-ionic surfactant Triton X-114 without a chelating agent. The parameters of CPE were investigated in detail. At optimum conditions, the linear range of 5.0–200.0 ng L−1 of Au(III) and the detection limits of 1.1 ng L−1 for Au(III) along with enrichment factors of 7.5, were obtained. The proposed method was applied to determination of ultra-trace amounts of gold in water samples with satisfactory results. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001780 [article] Simplified cloud point extraction-inductively coupled plasma mass spectrometry for the preconcentration/analysis of ultra-trace gold [texte imprimé] / Songqing Chen, Auteur ; Xiashi Zhu, Auteur . - 2011 . - pp. 1152–1154. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1152–1154 Mots-clés : Gold  Triton  X-114  Cloud  point  extraction  Inductively  coupled  plasma  mass  spectrometry Résumé : A new cloud point extraction method for the preconcentration of ultra-trace gold as a prior step to its determination by inductively coupled plasma mass spectrometry (ICP-MS) has been developed. The method is based on the cloud point extraction (CPE) of gold in the non-ionic surfactant Triton X-114 without a chelating agent. The parameters of CPE were investigated in detail. At optimum conditions, the linear range of 5.0–200.0 ng L−1 of Au(III) and the detection limits of 1.1 ng L−1 for Au(III) along with enrichment factors of 7.5, were obtained. The proposed method was applied to determination of ultra-trace amounts of gold in water samples with satisfactory results. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001780

Ferrovanadium production from petroleum fly ash and BOF flue dust / Yanping Xiao in Minerals engineering, Vol. 23 N° 14 (Novembre 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1155–1157 Titre : Ferrovanadium production from petroleum fly ash and BOF flue dust Type de document : texte imprimé Auteurs : Yanping Xiao, Auteur ; Heikki Jalkanen, Auteur ; Yongxiang Yang, Auteur Année de publication : 2011 Article en page(s) : pp. 1155–1157 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Industrial  wastes  Petroleum  fly  ash  BOF  flue  dust  Thermal  processing  Ferrovanadium Résumé : Fly ash is generated as a solid residue in the power plant using crude oil and petroleum coke as fuels, and contains significant amount of vanadium. To utilize the industrial wastes, a better processing route is to convert environmentally hazardous wastes that have no or limited market value into products or intermediate products with added market value. In the present study a recipe-based concept is introduced and metal recovery from a selected waste mixture is investigated in the lab-scale experiments. Two waste ash residues of BOF steelmaking flue dust and petroleum fly ash are used as raw materials, and the residue carbon from the fly ash is used as reducing agent. The ferrovanadium with about 20 wt.% vanadium is obtained. This proves that a recipe-based waste processing can be a sustainable option for the future waste management. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001950 [article] Ferrovanadium production from petroleum fly ash and BOF flue dust [texte imprimé] / Yanping Xiao, Auteur ; Heikki Jalkanen, Auteur ; Yongxiang Yang, Auteur . - 2011 . - pp. 1155–1157. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 14 (Novembre 2010) . - pp. 1155–1157 Mots-clés : Industrial  wastes  Petroleum  fly  ash  BOF  flue  dust  Thermal  processing  Ferrovanadium Résumé : Fly ash is generated as a solid residue in the power plant using crude oil and petroleum coke as fuels, and contains significant amount of vanadium. To utilize the industrial wastes, a better processing route is to convert environmentally hazardous wastes that have no or limited market value into products or intermediate products with added market value. In the present study a recipe-based concept is introduced and metal recovery from a selected waste mixture is investigated in the lab-scale experiments. Two waste ash residues of BOF steelmaking flue dust and petroleum fly ash are used as raw materials, and the residue carbon from the fly ash is used as reducing agent. The ferrovanadium with about 20 wt.% vanadium is obtained. This proves that a recipe-based waste processing can be a sustainable option for the future waste management. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687510001950

Exemplaires

Bibliothèque Ecole Nationale Polytechnique d'Alger

Accueil

Se connecter

Météo

Adresse