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Ajouter le résultat dans votre panierSurface chemistry features in the flotation of KCl / Qinbo Cao in Minerals engineering, Vol. 23 N° 5 (Avril 2010)
Titre : Surface chemistry features in the flotation of KCl Type de document : texte imprimé Auteurs : Qinbo Cao, Auteur ; Hao Du, Auteur ; Jan D. Miller, Auteur Année de publication : 2011 Article en page(s) : pp. 365–373 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : KCl flotation Contact angle Adsorption Molecular dynamics simulation Résumé : Despite the successful industrial practice to recover KCl by flotation, the adsorption state of collectors at KCl salt surfaces is still not fully understood. In this paper, the flotation behavior of KCl and NaCl using different collectors and captive bubble contact angle measurements at KCl and NaCl crystal surfaces in their saturated solutions are reported. The influence of collector concentration and collector structure is considered. The results show that both cationic and anionic collectors produce a hydrophobic state at the structure breaking KCl salt surface, with finite contact angle values of between 30° and 60°. In contrast, the contact angle at the structure making NaCl salt surface is zero at all collector concentrations, suggesting that no collector adsorption occurs, a supposition that is supported by results from molecular dynamics simulation (MDS). Further, it appears that the presence of surface defects such as edges and corners promote the adsorption of collectors at the KCl surface, and that the flotation is achieved by bubble attachment at the edges/corners of KCl particles with the formation of aeroflocs. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900288X
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 365–373[article] Surface chemistry features in the flotation of KCl [texte imprimé] / Qinbo Cao, Auteur ; Hao Du, Auteur ; Jan D. Miller, Auteur . - 2011 . - pp. 365–373.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 365–373
Mots-clés : KCl flotation Contact angle Adsorption Molecular dynamics simulation Résumé : Despite the successful industrial practice to recover KCl by flotation, the adsorption state of collectors at KCl salt surfaces is still not fully understood. In this paper, the flotation behavior of KCl and NaCl using different collectors and captive bubble contact angle measurements at KCl and NaCl crystal surfaces in their saturated solutions are reported. The influence of collector concentration and collector structure is considered. The results show that both cationic and anionic collectors produce a hydrophobic state at the structure breaking KCl salt surface, with finite contact angle values of between 30° and 60°. In contrast, the contact angle at the structure making NaCl salt surface is zero at all collector concentrations, suggesting that no collector adsorption occurs, a supposition that is supported by results from molecular dynamics simulation (MDS). Further, it appears that the presence of surface defects such as edges and corners promote the adsorption of collectors at the KCl surface, and that the flotation is achieved by bubble attachment at the edges/corners of KCl particles with the formation of aeroflocs. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900288X Exemplaires
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Titre : The effect of breakage mechanism on the mineral liberation properties of sulphide ores Type de document : texte imprimé Auteurs : T.G. Vizcarra, Auteur ; E.M. Wightman, Auteur ; N.W. Johnson, Auteur Année de publication : 2011 Article en page(s) : pp. 374–382 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Liberation Comminution Sulphide ores Oxide Ore mineralogy Résumé : The effect of particle-bed breakage mechanisms on the liberation properties of ores remains unclear. Surprisingly few studies have been published in this area and limitations in liberation measurement techniques previously used have prevented definitive conclusions from being reached regarding whether particle-bed breakage enhances the liberation properties of mineral ores relative to conventional grinding mechanisms. In this study, two sulphide ores of differing textures were comminuted to various size distributions using impact and particle-bed breakage mechanisms in a hammer mill and a piston–die compression unit respectively. The liberation properties of the various discharge samples were then characterised using a mineral liberation analyser – a mineralogical characterisation system based on automated scanning electron microscopy. It was found that the size-by-size liberation properties of both valuable and gangue mineral phases were independent of both the method used to comminute the samples, as well as the particle size distribution of the final products. These effects are discussed in terms of how they may be exploited in liberation modelling and characterising comminution circuit performance. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002908
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 374–382[article] The effect of breakage mechanism on the mineral liberation properties of sulphide ores [texte imprimé] / T.G. Vizcarra, Auteur ; E.M. Wightman, Auteur ; N.W. Johnson, Auteur . - 2011 . - pp. 374–382.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 374–382
Mots-clés : Liberation Comminution Sulphide ores Oxide Ore mineralogy Résumé : The effect of particle-bed breakage mechanisms on the liberation properties of ores remains unclear. Surprisingly few studies have been published in this area and limitations in liberation measurement techniques previously used have prevented definitive conclusions from being reached regarding whether particle-bed breakage enhances the liberation properties of mineral ores relative to conventional grinding mechanisms. In this study, two sulphide ores of differing textures were comminuted to various size distributions using impact and particle-bed breakage mechanisms in a hammer mill and a piston–die compression unit respectively. The liberation properties of the various discharge samples were then characterised using a mineral liberation analyser – a mineralogical characterisation system based on automated scanning electron microscopy. It was found that the size-by-size liberation properties of both valuable and gangue mineral phases were independent of both the method used to comminute the samples, as well as the particle size distribution of the final products. These effects are discussed in terms of how they may be exploited in liberation modelling and characterising comminution circuit performance. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002908 Exemplaires
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Titre : The point of zero charge of phyllosilicate minerals using the Mular–Roberts titration technique Type de document : texte imprimé Auteurs : M. Alvarez-Silva, Auteur ; A. Uribe-Salas, Auteur ; M. Mirnezami, Auteur Année de publication : 2011 Article en page(s) : pp. 383–389 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulphide ores Mineral processing Froth flotation Résumé : The point of zero charge (PZC) of electrokinetically anisotropic minerals (chlorite and serpentine) was determined using the Mular–Roberts (M–R) titration technique, and compared to isoelectric point (IEP) obtained from electrophoretic mobility measurements. To validate the M–R technique, the point of zero charge and isoelectric point of two isotropic minerals (alumina and silica) were shown to be comparable. For serpentine and chlorite, respectively, the PZC was found at pH 4.3 and 4.7, while the IEP occurred at pH 4 and DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900291X
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 383–389[article] The point of zero charge of phyllosilicate minerals using the Mular–Roberts titration technique [texte imprimé] / M. Alvarez-Silva, Auteur ; A. Uribe-Salas, Auteur ; M. Mirnezami, Auteur . - 2011 . - pp. 383–389.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 383–389
Mots-clés : Sulphide ores Mineral processing Froth flotation Résumé : The point of zero charge (PZC) of electrokinetically anisotropic minerals (chlorite and serpentine) was determined using the Mular–Roberts (M–R) titration technique, and compared to isoelectric point (IEP) obtained from electrophoretic mobility measurements. To validate the M–R technique, the point of zero charge and isoelectric point of two isotropic minerals (alumina and silica) were shown to be comparable. For serpentine and chlorite, respectively, the PZC was found at pH 4.3 and 4.7, while the IEP occurred at pH 4 and DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900291X Exemplaires
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Titre : Influence of quartz particles on wear in vertical roller mills : Part I: Quartz concentration Type de document : texte imprimé Auteurs : Lucas R.D. Jensen, Auteur ; Henrik Friis, Auteur ; Erling Fundal, Auteur Année de publication : 2011 Article en page(s) : pp. 390–398 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution Limestones Particle size Wear Vertical roller mills Quartz mechanisms Résumé : The standard closed circuit comminution process commonly employed in industrial vertical roller mills has been analyzed to determine the influence of typical abrasive minerals on wear rates. With the main focus on raw mixes used in cement plants, synthetic mixtures imitating were prepared.
Using statistical planning, a total of 10 tests were carried out with two different limestones and one type of quartz sand. The size distributions were kept constant and only the mixing ratios were varied. It appears from the investigation that mixtures consisting of minerals with different grindabilities result in an increased concentration of abrasive particles in the grinding bed (R2>0.99). The present study shows that the quartz concentration in the grinding bed is determining the wear rate.DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002921
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 390–398[article] Influence of quartz particles on wear in vertical roller mills : Part I: Quartz concentration [texte imprimé] / Lucas R.D. Jensen, Auteur ; Henrik Friis, Auteur ; Erling Fundal, Auteur . - 2011 . - pp. 390–398.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 390–398
Mots-clés : Comminution Limestones Particle size Wear Vertical roller mills Quartz mechanisms Résumé : The standard closed circuit comminution process commonly employed in industrial vertical roller mills has been analyzed to determine the influence of typical abrasive minerals on wear rates. With the main focus on raw mixes used in cement plants, synthetic mixtures imitating were prepared.
Using statistical planning, a total of 10 tests were carried out with two different limestones and one type of quartz sand. The size distributions were kept constant and only the mixing ratios were varied. It appears from the investigation that mixtures consisting of minerals with different grindabilities result in an increased concentration of abrasive particles in the grinding bed (R2>0.99). The present study shows that the quartz concentration in the grinding bed is determining the wear rate.DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002921 Exemplaires
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Titre : The effect of iron contaminants on thiosulphate leaching of gold Type de document : texte imprimé Auteurs : D. Feng, Auteur ; J. S. J. van Deventer, Auteur Année de publication : 2011 Article en page(s) : pp. 399–406 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Gold ores Sulphide Grinding Leaching Surface modification Résumé : Metallic iron and ferric ions were subjected to wet grinding with a sulphide ore in a ceramic ball mill to simulate the fine grinding process using mild steel, in an attempt to investigate the effect of iron species on the ammoniacal thiosulphate leaching of gold. Metallic iron and ferric ions decreased gold leaching in both kinetics and overall extraction when they were added in the wet grinding of a sulphide ore. This detrimental effect became more pronounced with the addition of metallic iron and ferric ions at higher concentrations. Metallic iron retarded the gold leaching more than ferric ions at the same dosage. The decomposition of thiosulphate in the leaching of the sulphide ore increased with the addition of metallic iron and ferric ions in the wet grinding. Thermodynamic analysis indicated that the predominant species for iron was ferric hydroxide under the leaching conditions. Wet grinding at a higher pH of 9 and use of ethylenediaminetetraacetic acid (EDTA) were ineffective in improving the gold leaching with the addition of metallic ions and ferric ions in the wet grinding. Iron oxide and hydroxide slime coatings at the surfaces of pyrite and pyrrhotite were reduced using carboxymethyl cellulose (CMC) to render the sulphide and slime particle surfaces highly negatively charged. Precipitation of iron oxide species at the surfaces of pyrite and pyrrhotite was observed in the morphological study of the leach residues with the addition of metallic iron in the wet grinding. The addition of CMC effectively reduced iron oxide slime coating at the sulphide surfaces and the aggregation of fine particles. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002945
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 399–406[article] The effect of iron contaminants on thiosulphate leaching of gold [texte imprimé] / D. Feng, Auteur ; J. S. J. van Deventer, Auteur . - 2011 . - pp. 399–406.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 399–406
Mots-clés : Gold ores Sulphide Grinding Leaching Surface modification Résumé : Metallic iron and ferric ions were subjected to wet grinding with a sulphide ore in a ceramic ball mill to simulate the fine grinding process using mild steel, in an attempt to investigate the effect of iron species on the ammoniacal thiosulphate leaching of gold. Metallic iron and ferric ions decreased gold leaching in both kinetics and overall extraction when they were added in the wet grinding of a sulphide ore. This detrimental effect became more pronounced with the addition of metallic iron and ferric ions at higher concentrations. Metallic iron retarded the gold leaching more than ferric ions at the same dosage. The decomposition of thiosulphate in the leaching of the sulphide ore increased with the addition of metallic iron and ferric ions in the wet grinding. Thermodynamic analysis indicated that the predominant species for iron was ferric hydroxide under the leaching conditions. Wet grinding at a higher pH of 9 and use of ethylenediaminetetraacetic acid (EDTA) were ineffective in improving the gold leaching with the addition of metallic ions and ferric ions in the wet grinding. Iron oxide and hydroxide slime coatings at the surfaces of pyrite and pyrrhotite were reduced using carboxymethyl cellulose (CMC) to render the sulphide and slime particle surfaces highly negatively charged. Precipitation of iron oxide species at the surfaces of pyrite and pyrrhotite was observed in the morphological study of the leach residues with the addition of metallic iron in the wet grinding. The addition of CMC effectively reduced iron oxide slime coating at the sulphide surfaces and the aggregation of fine particles. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002945 Exemplaires
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Titre : Development of a model for serpentine quantification in nickel laterite minerals by infrared spectroscopy Type de document : texte imprimé Auteurs : Andrew Basile, Auteur ; Jeffrey Hughes, Auteur ; Angus J. McFarlane, Auteur Année de publication : 2011 Article en page(s) : pp. 407–412 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Diffuse reflectance infrared Fourier transform spectroscopy Serpentine Leaching Ore mineralogy Oxide ores Mineral processing Partial least squares Résumé : An investigation into the possibility of using infrared techniques to quantify serpentine in nickel laterite ores was carried out. Results obtained from this preliminary study confirmed that high confidence in serpentine content prediction is possible obtaining RMSEP and R2 values of 1.76 and 0.97 respectively.
One hundred and forty mineral mixtures simulating limonite, transition and saprolite horizons of a Western Australian nickel laterite deposit were prepared. Diffuse reflectance infrared Fourier transform spectroscopy spectra obtained from these mixtures were used as a training set to prepare a quantitative model for serpentine content using Partial least squares multivariate analysis.
The model in turn was validated by predicting the serpentine content of 20 synthetic mixtures with confidence. The model was applied to 10 natural ores from various deposits, diversity between the synthetic and natural ore assemblages meant the analysis was qualitative. Model development using real ore samples would be required to enable incorporation of the intrinsic properties of the natural serpentine and the ore mineralogy in general.DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002969
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 407–412[article] Development of a model for serpentine quantification in nickel laterite minerals by infrared spectroscopy [texte imprimé] / Andrew Basile, Auteur ; Jeffrey Hughes, Auteur ; Angus J. McFarlane, Auteur . - 2011 . - pp. 407–412.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 407–412
Mots-clés : Diffuse reflectance infrared Fourier transform spectroscopy Serpentine Leaching Ore mineralogy Oxide ores Mineral processing Partial least squares Résumé : An investigation into the possibility of using infrared techniques to quantify serpentine in nickel laterite ores was carried out. Results obtained from this preliminary study confirmed that high confidence in serpentine content prediction is possible obtaining RMSEP and R2 values of 1.76 and 0.97 respectively.
One hundred and forty mineral mixtures simulating limonite, transition and saprolite horizons of a Western Australian nickel laterite deposit were prepared. Diffuse reflectance infrared Fourier transform spectroscopy spectra obtained from these mixtures were used as a training set to prepare a quantitative model for serpentine content using Partial least squares multivariate analysis.
The model in turn was validated by predicting the serpentine content of 20 synthetic mixtures with confidence. The model was applied to 10 natural ores from various deposits, diversity between the synthetic and natural ore assemblages meant the analysis was qualitative. Model development using real ore samples would be required to enable incorporation of the intrinsic properties of the natural serpentine and the ore mineralogy in general.DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002969 Exemplaires
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Titre : Effect of mechanical and chemical clay removals by hydrocyclone and dispersants on coal flotation Type de document : texte imprimé Auteurs : William J. Oats, Auteur ; Orhan Ozdemir, Auteur ; Anh V. Nguyen, Auteur Année de publication : 2011 Article en page(s) : pp. 413–419 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Coal flotation Slime Clay Dispersants Hydrocyclone Colloid stability DLVO forces Résumé : Fine minerals, mostly clays, are known to have a detrimental effect on coal flotation. This paper focuses on the effect of mechanical and chemical removals of fine minerals by hydrocyclone and dispersants on coal flotation. The experimental results showed that the flotation recovery slightly increased from medium acidic to medium alkaline ranges. The flotation experiments carried out with dispersants at different dosages showed that the dispersants did not enhance the flotation recovery significantly. However, the removal of the fine fraction from the feed using a hydrocyclone significantly increased the flotation recovery. The bubble–particle attachment tests also indicated that the attachment time between an air bubble and the coal particles increased in the presence of clay particles. These attachment time results clearly showed that the clay particles adversely affected the flotation of coal particles by covering the coal surfaces which reduced the efficiency of bubble–coal attachment. An analysis based on the colloid stability theory showed that the clay coating was governed by the van der Waals attraction and that the double-layer interaction played a secondary role. It was also concluded that the best way to increase the flotation recovery in the presence of clays was to remove these fine minerals by mechanical means such as hydrocylones. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002994
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 413–419[article] Effect of mechanical and chemical clay removals by hydrocyclone and dispersants on coal flotation [texte imprimé] / William J. Oats, Auteur ; Orhan Ozdemir, Auteur ; Anh V. Nguyen, Auteur . - 2011 . - pp. 413–419.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 413–419
Mots-clés : Coal flotation Slime Clay Dispersants Hydrocyclone Colloid stability DLVO forces Résumé : Fine minerals, mostly clays, are known to have a detrimental effect on coal flotation. This paper focuses on the effect of mechanical and chemical removals of fine minerals by hydrocyclone and dispersants on coal flotation. The experimental results showed that the flotation recovery slightly increased from medium acidic to medium alkaline ranges. The flotation experiments carried out with dispersants at different dosages showed that the dispersants did not enhance the flotation recovery significantly. However, the removal of the fine fraction from the feed using a hydrocyclone significantly increased the flotation recovery. The bubble–particle attachment tests also indicated that the attachment time between an air bubble and the coal particles increased in the presence of clay particles. These attachment time results clearly showed that the clay particles adversely affected the flotation of coal particles by covering the coal surfaces which reduced the efficiency of bubble–coal attachment. An analysis based on the colloid stability theory showed that the clay coating was governed by the van der Waals attraction and that the double-layer interaction played a secondary role. It was also concluded that the best way to increase the flotation recovery in the presence of clays was to remove these fine minerals by mechanical means such as hydrocylones. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002994 Exemplaires
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Titre : The limits of fine particle flotation Type de document : texte imprimé Auteurs : Tatu Miettinen, Auteur ; John Ralston, Auteur ; Daniel Fornasiero, Auteur Année de publication : 2011 Article en page(s) : pp. 420–437 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Fine particle flotation Flotation Résumé : Understanding the limits of fine particle flotation is the key to the selective separation of fine mineral particles. Fine particles have low collision efficiencies with gas bubbles and float slowly. There has been a great deal of work aimed at overcoming the inefficient collision of small particles with rising air bubbles. This review deals with the influence of bubble size, particle aggregation, different flow conditions, particle induction time, as well as the action of surface and capillary forces on fine particle–bubble capture. Recommendations for practice are given. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003033
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 420–437[article] The limits of fine particle flotation [texte imprimé] / Tatu Miettinen, Auteur ; John Ralston, Auteur ; Daniel Fornasiero, Auteur . - 2011 . - pp. 420–437.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 420–437
Mots-clés : Fine particle flotation Flotation Résumé : Understanding the limits of fine particle flotation is the key to the selective separation of fine mineral particles. Fine particles have low collision efficiencies with gas bubbles and float slowly. There has been a great deal of work aimed at overcoming the inefficient collision of small particles with rising air bubbles. This review deals with the influence of bubble size, particle aggregation, different flow conditions, particle induction time, as well as the action of surface and capillary forces on fine particle–bubble capture. Recommendations for practice are given. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003033 Exemplaires
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Titre : The environmental costs of platinum–PGM mining and sustainability : Is the glass half-full or half-empty? Type de document : texte imprimé Auteurs : Bonnie J. Glaister, Auteur ; Gavin M. Mudd, Auteur Année de publication : 2011 Article en page(s) : pp. 438–450 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Platinum Palladium Mineral resources Sustainable mining Resource intensity Greenhouse gas emissions Energy Résumé : The growing popularity of platinum group metals (or PGMs, including platinum and palladium) for a wide range of applications leads to some interesting issues for mining and sustainability. The uses of PGMs includes catalytic converters for air pollution control in vehicles, growing jewellery use, catalysts for various purposes (especially petroleum and chemicals processing), hydrogen fuel cells, and many others. Given the growing importance of most of these PGM uses in more sustainable technologies or in making industrial processes more efficient, it is critical to understand the complex sustainability issues which surround PGMs. At present, South Africa is the dominant PGMs producer and holds ∼88% of estimated global resources, with additional production and resources in Russia, Zimbabwe, Canada and the United States. Given the concentrated location of PGM resources, what are the likely trends in PGM mining with respect to environmental sustainability? That is, what are the costs in terms of energy, pollution, greenhouse gas emissions, water, land use impacts, social impacts, economic aspects associated with this globally important industry? This paper compiles and analyses a range of data on PGM mining. It synthesizes a unique combination of data which relates typical production aspects such as ore grade and scale with sustainability aspects such as greenhouse, energy and water costs. The findings are critical in understanding the debate about the increasing environmental and social costs of some materials and technologies which are considered crucial for sustainable technologies based on PGMs. Overall, the paper represents a valuable insight into the environmental and resource sustainability of the PGM sector. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003045
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 438–450[article] The environmental costs of platinum–PGM mining and sustainability : Is the glass half-full or half-empty? [texte imprimé] / Bonnie J. Glaister, Auteur ; Gavin M. Mudd, Auteur . - 2011 . - pp. 438–450.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 438–450
Mots-clés : Platinum Palladium Mineral resources Sustainable mining Resource intensity Greenhouse gas emissions Energy Résumé : The growing popularity of platinum group metals (or PGMs, including platinum and palladium) for a wide range of applications leads to some interesting issues for mining and sustainability. The uses of PGMs includes catalytic converters for air pollution control in vehicles, growing jewellery use, catalysts for various purposes (especially petroleum and chemicals processing), hydrogen fuel cells, and many others. Given the growing importance of most of these PGM uses in more sustainable technologies or in making industrial processes more efficient, it is critical to understand the complex sustainability issues which surround PGMs. At present, South Africa is the dominant PGMs producer and holds ∼88% of estimated global resources, with additional production and resources in Russia, Zimbabwe, Canada and the United States. Given the concentrated location of PGM resources, what are the likely trends in PGM mining with respect to environmental sustainability? That is, what are the costs in terms of energy, pollution, greenhouse gas emissions, water, land use impacts, social impacts, economic aspects associated with this globally important industry? This paper compiles and analyses a range of data on PGM mining. It synthesizes a unique combination of data which relates typical production aspects such as ore grade and scale with sustainability aspects such as greenhouse, energy and water costs. The findings are critical in understanding the debate about the increasing environmental and social costs of some materials and technologies which are considered crucial for sustainable technologies based on PGMs. Overall, the paper represents a valuable insight into the environmental and resource sustainability of the PGM sector. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003045 Exemplaires
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Titre : A novel pre-treatment of calaverite by hydrothermal mineral replacement reactions Type de document : texte imprimé Auteurs : Zhao, Jing, Auteur ; Fang Xia, Auteur ; Allan Pring, Auteur Année de publication : 2011 Article en page(s) : pp. 451–453 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Precious metal ores Hydrometallurgy Extractive metallurgy Résumé : We report a new method for pre-treatment of refractory gold-bearing tellurides employing the hydrothermal mineral replacement reactions. The method is illustrated by the replacement of calaverite by metallic gold at 150–250 °C under vapor saturated pressures. The influences of temperature, pH, and additional salts (NaCl and Na2SO4) on the conversion rate were investigated using the orthogonal array design method. The results indicate that temperature is the most significant factor, followed by pH, and then additional salts. The optimal condition for fast and low cost conversion is 200 °C, pH 6.0, 0.01 M NaCl, and DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002933
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 451–453[article] A novel pre-treatment of calaverite by hydrothermal mineral replacement reactions [texte imprimé] / Zhao, Jing, Auteur ; Fang Xia, Auteur ; Allan Pring, Auteur . - 2011 . - pp. 451–453.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 451–453
Mots-clés : Precious metal ores Hydrometallurgy Extractive metallurgy Résumé : We report a new method for pre-treatment of refractory gold-bearing tellurides employing the hydrothermal mineral replacement reactions. The method is illustrated by the replacement of calaverite by metallic gold at 150–250 °C under vapor saturated pressures. The influences of temperature, pH, and additional salts (NaCl and Na2SO4) on the conversion rate were investigated using the orthogonal array design method. The results indicate that temperature is the most significant factor, followed by pH, and then additional salts. The optimal condition for fast and low cost conversion is 200 °C, pH 6.0, 0.01 M NaCl, and DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002933 Exemplaires
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Titre : Separation of nickel from copper in ammoniacal/ammonium carbonate solution using ACORGA M5640 by selective stripping Type de document : texte imprimé Auteurs : Vaishnavi Sridhar, Auteur ; J.K. Verma, Auteur ; Nyoti S. Shenoy, Auteur Année de publication : 2011 Article en page(s) : pp. 454–456 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Solvent extraction Non-ferrous metallic ores Hydrometallurgy Co-extraction Selective stripping Résumé : Separation of nickel from copper in ammoniacal/ammonium carbonate solution using ACORGA M5640 by selective stripping was carried out. The influence of equilibration time, equilibrium pH and extractant concentration on the extraction of both the metals was studied. It was found that the copper extraction equilibrium was reached in a shorter time than the nickel extraction equilibrium. Nickel extraction decreases above an equilibrium pH of 9.0, while the extraction of copper remains unaffected by the changes in the equilibrium pH range of 7–10. Co-extraction, ammonia scrubbing and the selective stripping of copper and nickel were performed for a solution containing 3 g/l each of copper and nickel and 60 g/l ammonium carbonate. The extraction and the percentage stripping of copper and nickel were almost quantitative. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002982
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 454–456[article] Separation of nickel from copper in ammoniacal/ammonium carbonate solution using ACORGA M5640 by selective stripping [texte imprimé] / Vaishnavi Sridhar, Auteur ; J.K. Verma, Auteur ; Nyoti S. Shenoy, Auteur . - 2011 . - pp. 454–456.
Génie Minier
Langues : Anglais (eng)
in Minerals engineering > Vol. 23 N° 5 (Avril 2010) . - pp. 454–456
Mots-clés : Solvent extraction Non-ferrous metallic ores Hydrometallurgy Co-extraction Selective stripping Résumé : Separation of nickel from copper in ammoniacal/ammonium carbonate solution using ACORGA M5640 by selective stripping was carried out. The influence of equilibration time, equilibrium pH and extractant concentration on the extraction of both the metals was studied. It was found that the copper extraction equilibrium was reached in a shorter time than the nickel extraction equilibrium. Nickel extraction decreases above an equilibrium pH of 9.0, while the extraction of copper remains unaffected by the changes in the equilibrium pH range of 7–10. Co-extraction, ammonia scrubbing and the selective stripping of copper and nickel were performed for a solution containing 3 g/l each of copper and nickel and 60 g/l ammonium carbonate. The extraction and the percentage stripping of copper and nickel were almost quantitative. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002982 Exemplaires
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