Dépouillements

Mobilization of phosphorus from iron ore by the bacterium Burkholderia caribensis FeGL03 / P. Delvasto in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 1–9 Titre : Mobilization of phosphorus from iron ore by the bacterium Burkholderia caribensis FeGL03 Type de document : texte imprimé Auteurs : P. Delvasto, Auteur ; A. Ballester, Auteur ; J.A. Muñoz, Auteur Année de publication : 2009 Article en page(s) : pp. 1–9 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : High  phosphorus  iron  ore  Bacteria  Bioleaching Index. décimale : 622 Industrie minière Résumé : The bacterium Burkholderia caribensis FeGL03, isolated from a Brazilian high-phosphorus iron ore, was used to mobilize the phosphate contained in the same ore. The phosphate-mobilizing ability of the organism was tested in shake-flask cultures containing sterilized crushed iron ore in a chemically-defined liquid culture medium containing glucose (1 g/l) as carbon source and no phosphorus source except the ore itself. Phosphate removal from the ore was determined by measuring the residual phosphate contained in the ore after the bacterial treatment. The time course of the phosphate mobilization process was determined with two different particle sizes (2.0 mm and 0.2 mm mean size) of the crushed ore under conditions of unlimited and limited air exchange. Between 5% and 20% of the phosphorus originally contained in the ore was mobilized in 21 days of treatment. Other variables such as dissolved Fe, pH and cell counts were also monitored throughout the trials. It was also found that this bacterium accumulated gluconic acid in the spent broth. Scanning electron microscopy, revealed biofilms on the ore surface as a result of the production of exopolymeric substances (EPS). Extraction of the EPS from the cultures and its analysis by Fourier transform infrared techniques revealed the presence of molecular functionalities capable of interacting with the ore surface and with the iron dissolved in the medium. It was found that dense biofilms, formed under limited air exchange, resulted in lower phosphate mobilization from the ore than under unlimited air exchange. This was found to be a consequence of a dynamic process of iron and phosphate re-precipitation within the formed biofilms. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000496 [article] Mobilization of phosphorus from iron ore by the bacterium Burkholderia caribensis FeGL03 [texte imprimé] / P. Delvasto, Auteur ; A. Ballester, Auteur ; J.A. Muñoz, Auteur . - 2009 . - pp. 1–9. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 1–9 Mots-clés : High  phosphorus  iron  ore  Bacteria  Bioleaching Index. décimale : 622 Industrie minière Résumé : The bacterium Burkholderia caribensis FeGL03, isolated from a Brazilian high-phosphorus iron ore, was used to mobilize the phosphate contained in the same ore. The phosphate-mobilizing ability of the organism was tested in shake-flask cultures containing sterilized crushed iron ore in a chemically-defined liquid culture medium containing glucose (1 g/l) as carbon source and no phosphorus source except the ore itself. Phosphate removal from the ore was determined by measuring the residual phosphate contained in the ore after the bacterial treatment. The time course of the phosphate mobilization process was determined with two different particle sizes (2.0 mm and 0.2 mm mean size) of the crushed ore under conditions of unlimited and limited air exchange. Between 5% and 20% of the phosphorus originally contained in the ore was mobilized in 21 days of treatment. Other variables such as dissolved Fe, pH and cell counts were also monitored throughout the trials. It was also found that this bacterium accumulated gluconic acid in the spent broth. Scanning electron microscopy, revealed biofilms on the ore surface as a result of the production of exopolymeric substances (EPS). Extraction of the EPS from the cultures and its analysis by Fourier transform infrared techniques revealed the presence of molecular functionalities capable of interacting with the ore surface and with the iron dissolved in the medium. It was found that dense biofilms, formed under limited air exchange, resulted in lower phosphate mobilization from the ore than under unlimited air exchange. This was found to be a consequence of a dynamic process of iron and phosphate re-precipitation within the formed biofilms. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000496

Effect of surfactant OPD on the bioleaching of marmatite / Zhuoyue Lan in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 10–13 Titre : Effect of surfactant OPD on the bioleaching of marmatite Type de document : texte imprimé Auteurs : Zhuoyue Lan, Auteur ; Yuehua Hu, Auteur ; Wenqing Qin, Auteur Année de publication : 2009 Article en page(s) : pp. 10–13 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Bioleaching  Bacteria  Sulphide  ore  Reaction  kinetics  Hydrometallurgy Index. décimale : 622 Industrie minière Résumé : The effect of surfactant o-phenylenediamine (OPD) on the bioleaching of marmatite with mixed cultures of Acidithiobacillusferrooxidans, Acidithiobacillusthiooxidans and Leptospirillumferrooxidans was examined in shaking flasks. The effect of OPD on the iron and sulfur oxidizing capacity of the bacteria was also investigated. Results show that the addition of OPD in low concentration was favorable for the bio-oxidation of elemental sulfur and had little negative effect on that of iron. Chemical analysis and EDX analysis of the leached residues reveal that zinc was selectively leached over iron. The elemental sulfur produced from the leaching reaction was not completely oxidized and dissolved only partially even in the presence of bacteria, which limited the dissolution rate of marmatite. However, the addition of OPD accelerated the oxidation of elemental sulfur in the presence of bacteria, thus enhancing the bioleaching rate of marmatite. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000502 [article] Effect of surfactant OPD on the bioleaching of marmatite [texte imprimé] / Zhuoyue Lan, Auteur ; Yuehua Hu, Auteur ; Wenqing Qin, Auteur . - 2009 . - pp. 10–13. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 10–13 Mots-clés : Bioleaching  Bacteria  Sulphide  ore  Reaction  kinetics  Hydrometallurgy Index. décimale : 622 Industrie minière Résumé : The effect of surfactant o-phenylenediamine (OPD) on the bioleaching of marmatite with mixed cultures of Acidithiobacillusferrooxidans, Acidithiobacillusthiooxidans and Leptospirillumferrooxidans was examined in shaking flasks. The effect of OPD on the iron and sulfur oxidizing capacity of the bacteria was also investigated. Results show that the addition of OPD in low concentration was favorable for the bio-oxidation of elemental sulfur and had little negative effect on that of iron. Chemical analysis and EDX analysis of the leached residues reveal that zinc was selectively leached over iron. The elemental sulfur produced from the leaching reaction was not completely oxidized and dissolved only partially even in the presence of bacteria, which limited the dissolution rate of marmatite. However, the addition of OPD accelerated the oxidation of elemental sulfur in the presence of bacteria, thus enhancing the bioleaching rate of marmatite. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000502

Effects of intensive grinding on the dissolution of celestite in acidic chloride medium / Murat Erdemoğlu in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 14–24 Titre : Effects of intensive grinding on the dissolution of celestite in acidic chloride medium Type de document : texte imprimé Auteurs : Murat Erdemoğlu, Auteur ; Salih Aydoğan, Auteur ; Eberhard Gock, Auteur Année de publication : 2009 Article en page(s) : pp. 14–24 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Celestite  Dissolution  Intensive  grinding  Planetary  ball  mill Index. décimale : 622 Industrie minière Résumé : Effect of intensive grinding on the dissolution of celestite in acidic barium chloride and sodium chloride solutions was studied by investigating structural changes occurred during milling. Complete dissolution of the celestite was achieved within 25 min by milling in a planetary ball mill in which ball to ore ratio is 10. But, increasing grinding time and ball to ore ratio diminished the dissolution rate. X-ray amorphous phase content and XRD breadths increased and XRD line reflection intensity decreased with increasing of grinding time, and celestite does not undergo a considerable phase transformation during milling. SEM micrographs showed that how prolonged milling results in an increasing degree of agglomeration and a reduced amount of fines. Additionally, the ground samples were heated at elevated temperatures and then re-ground under earlier grinding conditions. Structural, morphological and dissolution characteristics of the samples obtained by each of the three treatments were also evaluated. It was concluded that high energy milling for short times increases the dissolution rate of celestite. But, increase in the particle size due to agglomeration or compactness of the particles as a result of impact stress predominant in planetary ball milling decreased the leaching rate, as grinding time and ball to ore ratio in the mill were increased. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000733 [article] Effects of intensive grinding on the dissolution of celestite in acidic chloride medium [texte imprimé] / Murat Erdemoğlu, Auteur ; Salih Aydoğan, Auteur ; Eberhard Gock, Auteur . - 2009 . - pp. 14–24. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 14–24 Mots-clés : Celestite  Dissolution  Intensive  grinding  Planetary  ball  mill Index. décimale : 622 Industrie minière Résumé : Effect of intensive grinding on the dissolution of celestite in acidic barium chloride and sodium chloride solutions was studied by investigating structural changes occurred during milling. Complete dissolution of the celestite was achieved within 25 min by milling in a planetary ball mill in which ball to ore ratio is 10. But, increasing grinding time and ball to ore ratio diminished the dissolution rate. X-ray amorphous phase content and XRD breadths increased and XRD line reflection intensity decreased with increasing of grinding time, and celestite does not undergo a considerable phase transformation during milling. SEM micrographs showed that how prolonged milling results in an increasing degree of agglomeration and a reduced amount of fines. Additionally, the ground samples were heated at elevated temperatures and then re-ground under earlier grinding conditions. Structural, morphological and dissolution characteristics of the samples obtained by each of the three treatments were also evaluated. It was concluded that high energy milling for short times increases the dissolution rate of celestite. But, increase in the particle size due to agglomeration or compactness of the particles as a result of impact stress predominant in planetary ball milling decreased the leaching rate, as grinding time and ball to ore ratio in the mill were increased. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000733

Humidity cell tests for the prediction of acid rock drainage / D.J. Sapsford in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 25–36 Titre : Humidity cell tests for the prediction of acid rock drainage Type de document : texte imprimé Auteurs : D.J. Sapsford, Auteur ; R. J. Bowell, Auteur ; M. Dey, Auteur Année de publication : 2009 Article en page(s) : pp. 25–36 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Acid  rock  drainage  Sulfide  ores  Pollution  Environmental  Oxidation Index. décimale : 622 Industrie minière Résumé : This paper presents a study of various geochemical humidity-style weathering tests that were carried out on waste mine rock from Avoca, County Wicklow, Ireland. The aim of this paper is to present data that demonstrate some of the geochemical controls on weathering rates together with release rates from laboratory testwork. These data are used to determine the applicability of various interpretations of humidity cell data for prediction of acid rock drainage. Furthermore, within this context the paper offers opinion on common questions related to the use of such tests: should humidity cells be aerated? How long should the test be run for? Is pre-treatment of the samples required? Is inoculation of the samples with iron and sulfur oxidising microbes required? And should these tests really be considered to be accelerated weathering tests? DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000770 [article] Humidity cell tests for the prediction of acid rock drainage [texte imprimé] / D.J. Sapsford, Auteur ; R. J. Bowell, Auteur ; M. Dey, Auteur . - 2009 . - pp. 25–36. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 25–36 Mots-clés : Acid  rock  drainage  Sulfide  ores  Pollution  Environmental  Oxidation Index. décimale : 622 Industrie minière Résumé : This paper presents a study of various geochemical humidity-style weathering tests that were carried out on waste mine rock from Avoca, County Wicklow, Ireland. The aim of this paper is to present data that demonstrate some of the geochemical controls on weathering rates together with release rates from laboratory testwork. These data are used to determine the applicability of various interpretations of humidity cell data for prediction of acid rock drainage. Furthermore, within this context the paper offers opinion on common questions related to the use of such tests: should humidity cells be aerated? How long should the test be run for? Is pre-treatment of the samples required? Is inoculation of the samples with iron and sulfur oxidising microbes required? And should these tests really be considered to be accelerated weathering tests? DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000770

The use of microscopy techniques to analyze microbial biofilm of the bio-oxidized chalcopyrite surface / Jiang Lei in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 37–42 Titre : The use of microscopy techniques to analyze microbial biofilm of the bio-oxidized chalcopyrite surface Type de document : texte imprimé Auteurs : Jiang Lei, Auteur ; Zhou Huaiyang, Auteur ; Peng Xiaotong, Auteur Année de publication : 2009 Article en page(s) : pp. 37–42 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Biofilm  Chalcopyrite  Bio-oxidation  Acidithiobacillus  ferrooxidans Index. décimale : 622 Industrie minière Résumé : This paper deals with the biofilm formed on the surfaces of chalcopyrite during the bio-oxidation process, with microscopy techniques (scanning electron microscope, fluorescence stereo microscope and transmission electron microscope) and in situ chemical analyzes (energy dispersive spectrometer). SEM images showed that this type of structured community of Acidithiobacillus ferrooxidans was made up of some bacteria and floccules. Moreover, TEM images indicated that these bacteria were wrapped by EPS. However, almost no EPS can be found in the suspending bacteria in the solution. In addition, large amounts of jarosite and element sulfur were determined in the bio-oxidation process, and the biofilm was covered with the deposition. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000794 [article] The use of microscopy techniques to analyze microbial biofilm of the bio-oxidized chalcopyrite surface [texte imprimé] / Jiang Lei, Auteur ; Zhou Huaiyang, Auteur ; Peng Xiaotong, Auteur . - 2009 . - pp. 37–42. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 37–42 Mots-clés : Biofilm  Chalcopyrite  Bio-oxidation  Acidithiobacillus  ferrooxidans Index. décimale : 622 Industrie minière Résumé : This paper deals with the biofilm formed on the surfaces of chalcopyrite during the bio-oxidation process, with microscopy techniques (scanning electron microscope, fluorescence stereo microscope and transmission electron microscope) and in situ chemical analyzes (energy dispersive spectrometer). SEM images showed that this type of structured community of Acidithiobacillus ferrooxidans was made up of some bacteria and floccules. Moreover, TEM images indicated that these bacteria were wrapped by EPS. However, almost no EPS can be found in the suspending bacteria in the solution. In addition, large amounts of jarosite and element sulfur were determined in the bio-oxidation process, and the biofilm was covered with the deposition. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000794

Upscaling laboratory results for water quality prediction at underground collieries in South Africa’s Highveld Coalfields / Brent Herbert Usher in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 43–56 Titre : Upscaling laboratory results for water quality prediction at underground collieries in South Africa’s Highveld Coalfields Type de document : texte imprimé Auteurs : Brent Herbert Usher, Auteur Année de publication : 2009 Article en page(s) : pp. 43–56 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Acid  rock  drainage  Coal  Environmental Index. décimale : 622 Industrie minière Résumé : The prediction of future acidity and water quality is a key aspect of water management in mining environments. In this paper, different prediction techniques tested in an isolated underground compartment at a colliery in the Highveld Coalfield of South Africa are discussed. Considerations for upscaling these results are explained, and a methodology for upscaling is tested at this facility. Over 30 samples were collected around the compartment and through cored boreholes. These samples were tested using acid–base accounting tests, humidity cells, and mineralogy. From this, an integrated interpretation of potential water quality evolution was made, supported by detailed water quality sampling with the use of surface boreholes, stratified sampling underground, and pumped qualities over a period of two years. The results show that analytical tests play an integral role in water quality predictions at underground collieries. The results also show that, despite the vast differences between laboratory test conditions and the situation in the field, by taking site conditions into account to properly contextualise the results, improved predictions of expected water quality can be obtained. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000800 [article] Upscaling laboratory results for water quality prediction at underground collieries in South Africa’s Highveld Coalfields [texte imprimé] / Brent Herbert Usher, Auteur . - 2009 . - pp. 43–56. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 43–56 Mots-clés : Acid  rock  drainage  Coal  Environmental Index. décimale : 622 Industrie minière Résumé : The prediction of future acidity and water quality is a key aspect of water management in mining environments. In this paper, different prediction techniques tested in an isolated underground compartment at a colliery in the Highveld Coalfield of South Africa are discussed. Considerations for upscaling these results are explained, and a methodology for upscaling is tested at this facility. Over 30 samples were collected around the compartment and through cored boreholes. These samples were tested using acid–base accounting tests, humidity cells, and mineralogy. From this, an integrated interpretation of potential water quality evolution was made, supported by detailed water quality sampling with the use of surface boreholes, stratified sampling underground, and pumped qualities over a period of two years. The results show that analytical tests play an integral role in water quality predictions at underground collieries. The results also show that, despite the vast differences between laboratory test conditions and the situation in the field, by taking site conditions into account to properly contextualise the results, improved predictions of expected water quality can be obtained. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000800

The effect of hydrodynamic parameters on probability of bubble–particle collision and attachment / B. Shahbazi in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 57–63 Titre : The effect of hydrodynamic parameters on probability of bubble–particle collision and attachment Type de document : texte imprimé Auteurs : B. Shahbazi, Auteur ; B. Rezai, Auteur ; S. M. Javad Koleini, Auteur Année de publication : 2009 Article en page(s) : pp. 57–63 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation  Coarse  particle  Dimensionless  parameters  Collision  Attachment Index. décimale : 622 Industrie minière Résumé : In this study the dependence of the impeller speed on the particle size variation was investigated on the quartz particles using laboratory mechanical flotation cell. Maximum recovery was obtained at 1100 rpm. For either more quiescent (impeller speed <900 rpm) or more turbulent (impeller speed >1300 rpm) conditions, flotation recovery decreased steadily. Furthermore, amount of collision probabilities is calculated using various equations. According to this study, maximum collision probability was obtained around 48.35% with impeller speed of 1100 rpm, air flow rate of 15 l/h and particle size of 545 μm and minimum collision probability was obtained around 2.43% with impeller speed of 700 rpm, air flow rate of 15 l/h and particle size of 256 μm. Maximum attachment probability was obtained around 44.16% with impeller speed of 1300 rpm, air flow rate of 75 l/h and particle size of 256 μm. With using some frothers such as poly propylene glycol, MIBC and pine oil, probability of collision increased, respectively. Maximum collision probability was obtained around 65.46% with poly propylene glycol dosage of 75 g/t and particle size of 545 μm. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000812 [article] The effect of hydrodynamic parameters on probability of bubble–particle collision and attachment [texte imprimé] / B. Shahbazi, Auteur ; B. Rezai, Auteur ; S. M. Javad Koleini, Auteur . - 2009 . - pp. 57–63. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 57–63 Mots-clés : Flotation  Coarse  particle  Dimensionless  parameters  Collision  Attachment Index. décimale : 622 Industrie minière Résumé : In this study the dependence of the impeller speed on the particle size variation was investigated on the quartz particles using laboratory mechanical flotation cell. Maximum recovery was obtained at 1100 rpm. For either more quiescent (impeller speed <900 rpm) or more turbulent (impeller speed >1300 rpm) conditions, flotation recovery decreased steadily. Furthermore, amount of collision probabilities is calculated using various equations. According to this study, maximum collision probability was obtained around 48.35% with impeller speed of 1100 rpm, air flow rate of 15 l/h and particle size of 545 μm and minimum collision probability was obtained around 2.43% with impeller speed of 700 rpm, air flow rate of 15 l/h and particle size of 256 μm. Maximum attachment probability was obtained around 44.16% with impeller speed of 1300 rpm, air flow rate of 75 l/h and particle size of 256 μm. With using some frothers such as poly propylene glycol, MIBC and pine oil, probability of collision increased, respectively. Maximum collision probability was obtained around 65.46% with poly propylene glycol dosage of 75 g/t and particle size of 545 μm. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000812

An evaluation of factors affecting the robustness of colour measurement and its potential to predict the grade of flotation concentrate / J.F. Reddick in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 64–69 Titre : An evaluation of factors affecting the robustness of colour measurement and its potential to predict the grade of flotation concentrate Type de document : texte imprimé Auteurs : J.F. Reddick, Auteur ; A.H. Hesketh, Auteur ; S.H. Morar, Auteur Année de publication : 2009 Article en page(s) : pp. 64–69 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : On-line  analysis  Process  control  Sulphide  ores  Froth  flotation Index. décimale : 622 Industrie minière Résumé : Recent developments in machine vision, applied to froth flotation, show the potential for the use of the measurement of froth surface descriptors to provide an improvement to the operation of flotation cells and banks. One such descriptor, froth colour, has been traditionally assumed to relate to the grade of the concentrate recovered. This work sets out to test this assumption, and was performed using a machine vision system, SmartFroth. This system included a camera hood with built in LED lighting, a colour calibration patch and a CIE ‘Lab’ colour space conversion algorithm, which all served to reduce the effect of ambient lighting on the colour measurements. The effectiveness of these techniques was evaluated by comparing colour measurements of dry synthetic ore under various lighting conditions. It was found that the influence of ambient lighting had not been completely eliminated. Batch flotation tests were conducted on a sulphide ore, from the Kennecott Utah Copperton Concentrator, and established that froth colour does not account for entrained gangue, which is barely visible on the froth surface. Thus, froth colour alone cannot be used to accurately predict concentrate grade. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000836 [article] An evaluation of factors affecting the robustness of colour measurement and its potential to predict the grade of flotation concentrate [texte imprimé] / J.F. Reddick, Auteur ; A.H. Hesketh, Auteur ; S.H. Morar, Auteur . - 2009 . - pp. 64–69. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 64–69 Mots-clés : On-line  analysis  Process  control  Sulphide  ores  Froth  flotation Index. décimale : 622 Industrie minière Résumé : Recent developments in machine vision, applied to froth flotation, show the potential for the use of the measurement of froth surface descriptors to provide an improvement to the operation of flotation cells and banks. One such descriptor, froth colour, has been traditionally assumed to relate to the grade of the concentrate recovered. This work sets out to test this assumption, and was performed using a machine vision system, SmartFroth. This system included a camera hood with built in LED lighting, a colour calibration patch and a CIE ‘Lab’ colour space conversion algorithm, which all served to reduce the effect of ambient lighting on the colour measurements. The effectiveness of these techniques was evaluated by comparing colour measurements of dry synthetic ore under various lighting conditions. It was found that the influence of ambient lighting had not been completely eliminated. Batch flotation tests were conducted on a sulphide ore, from the Kennecott Utah Copperton Concentrator, and established that froth colour does not account for entrained gangue, which is barely visible on the froth surface. Thus, froth colour alone cannot be used to accurately predict concentrate grade. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000836

Dynamic modelling and simulation of semi-autogenous mills / J.L. Salazar in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 70–77 Titre : Dynamic modelling and simulation of semi-autogenous mills Type de document : texte imprimé Auteurs : J.L. Salazar, Auteur ; L. Magne, Auteur ; G. Acuña, Auteur Année de publication : 2009 Article en page(s) : pp. 70–77 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Comminution  Modeling  SAG  milling  Simulation Index. décimale : 622 Industrie minière Résumé : This paper presents a dynamic simulator of the semi-autogenous grinding operation deduced from first principles coupled to an on-line parameter estimation scheme able to simulate industrial operations for control purposes. Model equations are based on conventional non-stationary population balance approach to develop the necessary dynamic model of the semi-autogenous mill operation. The model is able to predict the time-evolution of key operating variables such as product flow rate, level charge, power-draw and load position, as function of other important variables such as mill rotational speed and fresh feed characteristics. The set of ordinary differential equations was solved using MATLAB/SIMULINK as a graphic programming platform, a very helpful tool for understanding the grinding phenomenon. Using an on-line parameter estimator, the simulator was tested and validated at an 1800 t/h copper–ore mill showing the effectiveness of the system to track the dynamic behaviour of the variables. It is now being used for the study of advanced control schemes. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001064 [article] Dynamic modelling and simulation of semi-autogenous mills [texte imprimé] / J.L. Salazar, Auteur ; L. Magne, Auteur ; G. Acuña, Auteur . - 2009 . - pp. 70–77. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 70–77 Mots-clés : Comminution  Modeling  SAG  milling  Simulation Index. décimale : 622 Industrie minière Résumé : This paper presents a dynamic simulator of the semi-autogenous grinding operation deduced from first principles coupled to an on-line parameter estimation scheme able to simulate industrial operations for control purposes. Model equations are based on conventional non-stationary population balance approach to develop the necessary dynamic model of the semi-autogenous mill operation. The model is able to predict the time-evolution of key operating variables such as product flow rate, level charge, power-draw and load position, as function of other important variables such as mill rotational speed and fresh feed characteristics. The set of ordinary differential equations was solved using MATLAB/SIMULINK as a graphic programming platform, a very helpful tool for understanding the grinding phenomenon. Using an on-line parameter estimator, the simulator was tested and validated at an 1800 t/h copper–ore mill showing the effectiveness of the system to track the dynamic behaviour of the variables. It is now being used for the study of advanced control schemes. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001064

A numerical model for the liquid flow in a sputnik coal distributor / B.Y. Guo in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 78–87 Titre : A numerical model for the liquid flow in a sputnik coal distributor Type de document : texte imprimé Auteurs : B.Y. Guo, Auteur ; K. J. Dong, Auteur ; K. W. Chu, Auteur Année de publication : 2009 Article en page(s) : pp. 78–87 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Coal  preparation  Coal  distributor  Fluid  flow  Numerical  modeling  Computational  fluid  dynamics Index. décimale : 622 Industrie minière Résumé : Sputnik coal distributors are widely applied in coal separation plants and biased outputs are frequently encountered. The present paper aims to develop a numerical model for simulating the flow of the carrier liquid within a distributor chamber. The model uses simple homogeneous multi-phase flow model and performs well in terms of successfully predicting the important phenomena within the distributor chamber, such as the strong vortex in the upper chamber and channeling through the slots on the orifice plate, as observed experimentally. The model provides necessary information for particle flow modeling and offers a useful tool to trouble-shooting of operations and optimization of design for such type of devices. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001088 [article] A numerical model for the liquid flow in a sputnik coal distributor [texte imprimé] / B.Y. Guo, Auteur ; K. J. Dong, Auteur ; K. W. Chu, Auteur . - 2009 . - pp. 78–87. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 78–87 Mots-clés : Coal  preparation  Coal  distributor  Fluid  flow  Numerical  modeling  Computational  fluid  dynamics Index. décimale : 622 Industrie minière Résumé : Sputnik coal distributors are widely applied in coal separation plants and biased outputs are frequently encountered. The present paper aims to develop a numerical model for simulating the flow of the carrier liquid within a distributor chamber. The model uses simple homogeneous multi-phase flow model and performs well in terms of successfully predicting the important phenomena within the distributor chamber, such as the strong vortex in the upper chamber and channeling through the slots on the orifice plate, as observed experimentally. The model provides necessary information for particle flow modeling and offers a useful tool to trouble-shooting of operations and optimization of design for such type of devices. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001088

Hydrometallurgical recovery of copper and cobalt from reduction-roasted copper converter slag / Ewa Rudnik in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 88–95 Titre : Hydrometallurgical recovery of copper and cobalt from reduction-roasted copper converter slag Type de document : texte imprimé Auteurs : Ewa Rudnik, Auteur ; Lidia Burzyńska, Auteur ; Wanda Gumowska, Auteur Année de publication : 2009 Article en page(s) : pp. 88–95 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Copper  converter  slag  Hydrometallurgy  Electrowinning  Waste  processing Index. décimale : 622 Industrie minière Résumé : The paper is concerned with a simple hydrometallurgical method for selective recovery of copper and cobalt from industrial copper converter slag. The following consecutive stages are proposed: roasting of the slag in reduction conditions to produce Cu–Co–Fe–Pb alloy, electrolytic dissolution of the alloy in an ammonia–ammonium chloride solution, ammoniacal leaching of the slime, selective copper and cobalt electrowinning. Cu27–Co6–Fe64–Pb1.5 alloy was a five-phase system and did not dissolve uniformly during electrolysis. This resulted in the separation of the metals, wherein iron remained in the slime, while copper and cobalt were components of slime, electrolyte and cathodic deposit. A mechanism of the alloy dissolution was developed. A series of secondary processes took place in the system: precipitation of iron compounds, copper cementation with cobalt and iron; adsorption of copper and cobalt ions on the iron precipitates. Final products were metals of high purity (99.9% Cu, 92% Co). DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001234 [article] Hydrometallurgical recovery of copper and cobalt from reduction-roasted copper converter slag [texte imprimé] / Ewa Rudnik, Auteur ; Lidia Burzyńska, Auteur ; Wanda Gumowska, Auteur . - 2009 . - pp. 88–95. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 88–95 Mots-clés : Copper  converter  slag  Hydrometallurgy  Electrowinning  Waste  processing Index. décimale : 622 Industrie minière Résumé : The paper is concerned with a simple hydrometallurgical method for selective recovery of copper and cobalt from industrial copper converter slag. The following consecutive stages are proposed: roasting of the slag in reduction conditions to produce Cu–Co–Fe–Pb alloy, electrolytic dissolution of the alloy in an ammonia–ammonium chloride solution, ammoniacal leaching of the slime, selective copper and cobalt electrowinning. Cu27–Co6–Fe64–Pb1.5 alloy was a five-phase system and did not dissolve uniformly during electrolysis. This resulted in the separation of the metals, wherein iron remained in the slime, while copper and cobalt were components of slime, electrolyte and cathodic deposit. A mechanism of the alloy dissolution was developed. A series of secondary processes took place in the system: precipitation of iron compounds, copper cementation with cobalt and iron; adsorption of copper and cobalt ions on the iron precipitates. Final products were metals of high purity (99.9% Cu, 92% Co). DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001234

Hydrodynamic and metallurgical characteristics of industrial and pilot columns in rougher circuit / M. Massinaei in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 96–99 Titre : Hydrodynamic and metallurgical characteristics of industrial and pilot columns in rougher circuit Type de document : texte imprimé Auteurs : M. Massinaei, Auteur ; M. Kolahdoozan, Auteur ; M. Noaparast, Auteur Année de publication : 2009 Article en page(s) : pp. 96–99 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Froth  flotation  Flotation  kinetics  Flotation  bubbles  Flotation  machines Index. décimale : 622 Industrie minière Résumé : In this investigation, a pilot-scale flotation column was successfully designed, installed and tested in rougher circuit of the Miduk copper concentrator, Iran. The axial dispersion model was employed in the design procedure. Collection zone rate constant (kc) along with the target recovery of over 75% was used to size the column. The rate constant kc was determined based on a number of pilot and industrial experiments. Performance of the pilot column was compared with existing full-scale Microcel columns in a number of parallel experiments. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000484 [article] Hydrodynamic and metallurgical characteristics of industrial and pilot columns in rougher circuit [texte imprimé] / M. Massinaei, Auteur ; M. Kolahdoozan, Auteur ; M. Noaparast, Auteur . - 2009 . - pp. 96–99. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 96–99 Mots-clés : Froth  flotation  Flotation  kinetics  Flotation  bubbles  Flotation  machines Index. décimale : 622 Industrie minière Résumé : In this investigation, a pilot-scale flotation column was successfully designed, installed and tested in rougher circuit of the Miduk copper concentrator, Iran. The axial dispersion model was employed in the design procedure. Collection zone rate constant (kc) along with the target recovery of over 75% was used to size the column. The rate constant kc was determined based on a number of pilot and industrial experiments. Performance of the pilot column was compared with existing full-scale Microcel columns in a number of parallel experiments. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000484

Use of lignosulfonate for elemental sulfur biooxidation and copper leaching / Sylvie C. Bouffard in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 100–103 Titre : Use of lignosulfonate for elemental sulfur biooxidation and copper leaching Type de document : texte imprimé Auteurs : Sylvie C. Bouffard, Auteur ; Alain Tshilombo, Auteur ; Paul G. West-Sells, Auteur Année de publication : 2009 Article en page(s) : pp. 100–103 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sulfide  ores  Comminution  Bioleaching  Bacteria  Solvent  extraction Index. décimale : 622 Industrie minière Résumé : The surface-active properties of lignosulfonate, a solid by-product from the sulfite papermaking industry, were investigated in several aspects of a proposed Barrick copper heap leaching process where sulfur is added to the heap to be oxidized in-situ to produce acid. In this copper heap leaching process, lignosulfonate could affect sulfur milling, sulfur biooxidation, acid consumption, copper recovery, and solvent extraction of the copper pregnant leach solution. In milling, lignosulfonate was shown to reduce the measured Bond work index of sulfur in a batch mill, but not in a continuous mill. In biooxidation, lignosulfonate increased the growth rate of sulfur-oxidizing microorganisms, but the faster rate was not sustained during the whole biooxidation period. Lignosulfonate accelerated the kinetics of sulfur biooxidation in certain leach environments. In copper leaching, lignosulfonate did not have negative effects on copper recovery, acid consumption, or leach kinetics, but neither did it improve the kinetics of copper recovery. In solvent extraction, the separation of the organic and aqueous phases was rapid and clean if lignosulfonate was previously in contact with the copper ore or the sulfur particles. Based on these various outcomes, lignosulfonate did not have a negative impact on the copper heap leaching process tested, but does not constitute an essential additive to the process. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000745 [article] Use of lignosulfonate for elemental sulfur biooxidation and copper leaching [texte imprimé] / Sylvie C. Bouffard, Auteur ; Alain Tshilombo, Auteur ; Paul G. West-Sells, Auteur . - 2009 . - pp. 100–103. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 100–103 Mots-clés : Sulfide  ores  Comminution  Bioleaching  Bacteria  Solvent  extraction Index. décimale : 622 Industrie minière Résumé : The surface-active properties of lignosulfonate, a solid by-product from the sulfite papermaking industry, were investigated in several aspects of a proposed Barrick copper heap leaching process where sulfur is added to the heap to be oxidized in-situ to produce acid. In this copper heap leaching process, lignosulfonate could affect sulfur milling, sulfur biooxidation, acid consumption, copper recovery, and solvent extraction of the copper pregnant leach solution. In milling, lignosulfonate was shown to reduce the measured Bond work index of sulfur in a batch mill, but not in a continuous mill. In biooxidation, lignosulfonate increased the growth rate of sulfur-oxidizing microorganisms, but the faster rate was not sustained during the whole biooxidation period. Lignosulfonate accelerated the kinetics of sulfur biooxidation in certain leach environments. In copper leaching, lignosulfonate did not have negative effects on copper recovery, acid consumption, or leach kinetics, but neither did it improve the kinetics of copper recovery. In solvent extraction, the separation of the organic and aqueous phases was rapid and clean if lignosulfonate was previously in contact with the copper ore or the sulfur particles. Based on these various outcomes, lignosulfonate did not have a negative impact on the copper heap leaching process tested, but does not constitute an essential additive to the process. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000745

Procedure for determination of ball Bond work index in the commercial operations / R. Ahmadi in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 104–106 Titre : Procedure for determination of ball Bond work index in the commercial operations Type de document : texte imprimé Auteurs : R. Ahmadi, Auteur ; Sh. Shahsavari, Auteur Année de publication : 2009 Article en page(s) : pp. 104–106 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Iron  ores  Grinding  Modelling  Mineral  processing Index. décimale : 622 Industrie minière Résumé : The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling. This happens after 7–10 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to procedural errors. Starting from the first-order grinding kinetics defined by means of the Bond ball mill, this paper discusses a simplified procedure for a rapid determination of the work index by just two grinding tests. The applicability of the simplified procedure has been proved on samples of copper and Iron ores that are located in Iran. The values obtained by this procedure do not differ by more than 7% from those obtained in the standard Bond test. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001027 [article] Procedure for determination of ball Bond work index in the commercial operations [texte imprimé] / R. Ahmadi, Auteur ; Sh. Shahsavari, Auteur . - 2009 . - pp. 104–106. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 104–106 Mots-clés : Iron  ores  Grinding  Modelling  Mineral  processing Index. décimale : 622 Industrie minière Résumé : The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling. This happens after 7–10 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to procedural errors. Starting from the first-order grinding kinetics defined by means of the Bond ball mill, this paper discusses a simplified procedure for a rapid determination of the work index by just two grinding tests. The applicability of the simplified procedure has been proved on samples of copper and Iron ores that are located in Iran. The values obtained by this procedure do not differ by more than 7% from those obtained in the standard Bond test. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001027

Ferric leaching of copper slag flotation tailings / F. Carranza in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 107–110 Titre : Ferric leaching of copper slag flotation tailings Type de document : texte imprimé Auteurs : F. Carranza, Auteur ; N. Iglesias, Auteur ; A. Mazuelos, Auteur Année de publication : 2009 Article en page(s) : pp. 107–110 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Tailings  Copper  slag  Ferric  leaching Index. décimale : 622 Industrie minière Résumé : The pyrometallurgical production of copper generates slags, a residue with a significant content of this metal. Copper can be recovered from the slags by froth flotation after cooling, crushing, and grinding. The obtained Cu-concentrate is sent to the pyrometallurgical process. If grinding is not fine enough for efficient flotation, copper is lost in tailings. In this paper, the ferric leaching of slag flotation tailings is studied. Copper extractions of 66% are achieved by ferric leaching, and Cu content in tailings is reduced from 0.78% to 0.24%. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001076 [article] Ferric leaching of copper slag flotation tailings [texte imprimé] / F. Carranza, Auteur ; N. Iglesias, Auteur ; A. Mazuelos, Auteur . - 2009 . - pp. 107–110. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 107–110 Mots-clés : Tailings  Copper  slag  Ferric  leaching Index. décimale : 622 Industrie minière Résumé : The pyrometallurgical production of copper generates slags, a residue with a significant content of this metal. Copper can be recovered from the slags by froth flotation after cooling, crushing, and grinding. The obtained Cu-concentrate is sent to the pyrometallurgical process. If grinding is not fine enough for efficient flotation, copper is lost in tailings. In this paper, the ferric leaching of slag flotation tailings is studied. Copper extractions of 66% are achieved by ferric leaching, and Cu content in tailings is reduced from 0.78% to 0.24%. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001076

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