Dépouillements

Phytomining / V. Sheoran in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1007–1019 Titre : Phytomining : A review Type de document : texte imprimé Auteurs : V. Sheoran, Auteur ; A.S. Sheoran, Auteur ; P. Poonia, Auteur Année de publication : 2009 Article en page(s) : pp. 1007–1019 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mining  Pollution  Reclamation  Wasteprocessing  Precious  metal  ores Résumé : Bioharvesting of metals from high biomass crops grown in soil substrates particularly those associated with sub-economic mineralization is termed phytomining. It is a recent more advanced technology of phytoremediation to produce low volume, sulphide-free ‘bio-ore’, which can either be safely disposed of or, if the target metal is of sufficient economic value, smelted, and recovered. This technology has potential application in the mineral industry to return an economic profit by commercial production of metals via cropping. Numerous sites across the globe are enriched with metals that could potentially be phytomined. In recent years major scientific progress has been made in understanding the potential for application of this herbage-based technique in the mining industry to develop a good relationship between the industry and community. This paper reviews various aspects of phytomining along with the advantages, limitations, and future feasibility of the technology. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900106X [article] Phytomining : A review [texte imprimé] / V. Sheoran, Auteur ; A.S. Sheoran, Auteur ; P. Poonia, Auteur . - 2009 . - pp. 1007–1019. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1007–1019 Mots-clés : Mining  Pollution  Reclamation  Wasteprocessing  Precious  metal  ores Résumé : Bioharvesting of metals from high biomass crops grown in soil substrates particularly those associated with sub-economic mineralization is termed phytomining. It is a recent more advanced technology of phytoremediation to produce low volume, sulphide-free ‘bio-ore’, which can either be safely disposed of or, if the target metal is of sufficient economic value, smelted, and recovered. This technology has potential application in the mineral industry to return an economic profit by commercial production of metals via cropping. Numerous sites across the globe are enriched with metals that could potentially be phytomined. In recent years major scientific progress has been made in understanding the potential for application of this herbage-based technique in the mining industry to develop a good relationship between the industry and community. This paper reviews various aspects of phytomining along with the advantages, limitations, and future feasibility of the technology. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900106X

Production of high purity molybdenum compounds from a Cu–Mo acid-washed liquor using solvent extraction / J.W. An in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1020–1025 Titre : Production of high purity molybdenum compounds from a Cu–Mo acid-washed liquor using solvent extraction : Part 1: Laboratory studies Type de document : texte imprimé Auteurs : J.W. An, Auteur ; Lee, Y. H., Auteur ; S.J. Kim, Auteur Année de publication : 2009 Article en page(s) : pp. 1020–1025 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Molybdenum  Solvent  extraction  High  purity  Precipitation Résumé : Solvent extraction, using Alamine 304-1 for loading (extraction) and ammonia for stripping, was used for selectively recovering molybdenum from acid wash liquor produced by a Mo processing plant. The results showed that the extraction could be completed in 3 stages, using Alamine 304-1 as the extractant (10%, v/v in Anysol 150 diluent), with almost all the Mo(VI) recovered from an acidic sulfate wash liquor, containing 10–15 g/L Mo(VI), 10 g/L Cu(II) and 2 g/L Fe(III), using an O/A volumetric ratio of 3:2. Using ammonia (12.5%, w/v), at an O/A ratio of 5:1, all the Mo(VI) from an Alamine liquor containing 17.5 g/L Mo could be removed in one strip, yielding a solution with 87.0 g/L Mo(VI). High purity (>99.9%) MoO3 and CaMoO4 were produced from this pure liquor via an intermediate hydrate precipitate (MoO3 · H2O). The study also showed that understanding the stability and speciation of various soluble and solid Mo species are essential for the development of an efficient recovery process. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002100 [article] Production of high purity molybdenum compounds from a Cu–Mo acid-washed liquor using solvent extraction : Part 1: Laboratory studies [texte imprimé] / J.W. An, Auteur ; Lee, Y. H., Auteur ; S.J. Kim, Auteur . - 2009 . - pp. 1020–1025. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1020–1025 Mots-clés : Molybdenum  Solvent  extraction  High  purity  Precipitation Résumé : Solvent extraction, using Alamine 304-1 for loading (extraction) and ammonia for stripping, was used for selectively recovering molybdenum from acid wash liquor produced by a Mo processing plant. The results showed that the extraction could be completed in 3 stages, using Alamine 304-1 as the extractant (10%, v/v in Anysol 150 diluent), with almost all the Mo(VI) recovered from an acidic sulfate wash liquor, containing 10–15 g/L Mo(VI), 10 g/L Cu(II) and 2 g/L Fe(III), using an O/A volumetric ratio of 3:2. Using ammonia (12.5%, w/v), at an O/A ratio of 5:1, all the Mo(VI) from an Alamine liquor containing 17.5 g/L Mo could be removed in one strip, yielding a solution with 87.0 g/L Mo(VI). High purity (>99.9%) MoO3 and CaMoO4 were produced from this pure liquor via an intermediate hydrate precipitate (MoO3 · H2O). The study also showed that understanding the stability and speciation of various soluble and solid Mo species are essential for the development of an efficient recovery process. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002100

Production of high-purity molybdenum compounds from a Cu–Mo acid-washed liquor using solvent extraction / J.W. An in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1026–1031 Titre : Production of high-purity molybdenum compounds from a Cu–Mo acid-washed liquor using solvent extraction : Part 2: Pilot and plant operations Type de document : texte imprimé Auteurs : J.W. An, Auteur ; B.H. Jung, Auteur ; Lee, Y. H., Auteur Année de publication : 2009 Article en page(s) : pp. 1026–1031 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Molybdenum  Solvent  extraction  High  purity  Precipitation Résumé : Laboratory studies on the recovery of molybdenum from acid wash liquor, reported in Part 1 of this series of papers, identified the optimum process conditions for the production of high purity molybdenum trioxide and calcium molybdate. Pilot and plant scale operations were conducted as a result of the design developed during our laboratory studies. Molybdenum was selectively recovered from a wash liquor containing 10 g/L Mo via a 2-stage extraction using 10% v/v Alamine diluted in Anysol 150 diluent as extractant. The use of 10% v/v isodecanol (IDA) was found to enhance the extraction of molybdate from the wash liquor. The organic extractant liquor had to be scrubbed with water to remove the ammonium sulphate crud formed when ammonium hydroxide solution (20% w/v) was used to strip the molybdate from the loaded organic. The pilot scale study (0.2 m3/day) and plant operation (30 m3/day) were able to be continuously operated to recover 99% Mo from the wash liquor, from which high purity MoO3 and CaMoO4 of >99.9% purity could be recovered. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002112 [article] Production of high-purity molybdenum compounds from a Cu–Mo acid-washed liquor using solvent extraction : Part 2: Pilot and plant operations [texte imprimé] / J.W. An, Auteur ; B.H. Jung, Auteur ; Lee, Y. H., Auteur . - 2009 . - pp. 1026–1031. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1026–1031 Mots-clés : Molybdenum  Solvent  extraction  High  purity  Precipitation Résumé : Laboratory studies on the recovery of molybdenum from acid wash liquor, reported in Part 1 of this series of papers, identified the optimum process conditions for the production of high purity molybdenum trioxide and calcium molybdate. Pilot and plant scale operations were conducted as a result of the design developed during our laboratory studies. Molybdenum was selectively recovered from a wash liquor containing 10 g/L Mo via a 2-stage extraction using 10% v/v Alamine diluted in Anysol 150 diluent as extractant. The use of 10% v/v isodecanol (IDA) was found to enhance the extraction of molybdate from the wash liquor. The organic extractant liquor had to be scrubbed with water to remove the ammonium sulphate crud formed when ammonium hydroxide solution (20% w/v) was used to strip the molybdate from the loaded organic. The pilot scale study (0.2 m3/day) and plant operation (30 m3/day) were able to be continuously operated to recover 99% Mo from the wash liquor, from which high purity MoO3 and CaMoO4 of >99.9% purity could be recovered. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002112

Inferential measurement of sag mill parameters IV / T. A. Apelt in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1032–1044 Titre : Inferential measurement of sag mill parameters IV : Inferential model validation Type de document : texte imprimé Auteurs : T. A. Apelt, Auteur ; N.F. Thornhill, Auteur Année de publication : 2009 Article en page(s) : pp. 1032–1044 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : SAG  milling  Autogenous  grinding  Modelling  Simulation  Process  control Résumé : This paper discusses a case study application of inferential measurement models for semiautogenous grinding (SAG) mills and is the fourth paper in a series of five papers on inferential measurement of SAG mill parameters. The development of the inferential measurement models of SAG mill discharge and feed streams and mill rock and ball charge levels, detailed earlier in the series, is summarised here. The models are then tested on plant data for validation and analysis. Model characteristics are explored to highlight model sensitivity and relative uncertainty. The results are encouraging while limitations are noted and potential avenues for further research are discussed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900003X [article] Inferential measurement of sag mill parameters IV : Inferential model validation [texte imprimé] / T. A. Apelt, Auteur ; N.F. Thornhill, Auteur . - 2009 . - pp. 1032–1044. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1032–1044 Mots-clés : SAG  milling  Autogenous  grinding  Modelling  Simulation  Process  control Résumé : This paper discusses a case study application of inferential measurement models for semiautogenous grinding (SAG) mills and is the fourth paper in a series of five papers on inferential measurement of SAG mill parameters. The development of the inferential measurement models of SAG mill discharge and feed streams and mill rock and ball charge levels, detailed earlier in the series, is summarised here. The models are then tested on plant data for validation and analysis. Model characteristics are explored to highlight model sensitivity and relative uncertainty. The results are encouraging while limitations are noted and potential avenues for further research are discussed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900003X

Inferential measurement of SAG mill parameters V / T. A. Apelt in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1045–1052 Titre : Inferential measurement of SAG mill parameters V : MPC simulation Type de document : texte imprimé Auteurs : T. A. Apelt, Auteur ; N.F. Thornhill, Auteur Année de publication : 2009 Article en page(s) : pp. 1045–1052 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : SAG  milling  Autogenous  grinding  Modelling  Simulation  Process  control Résumé : This paper discusses a case study application of inferential measurement models for semiautogenous grinding (SAG) mills and is the last in a five-part series on Inferential Measurement of SAG Mill Parameters. Inferential measurements of SAG mill discharge and feed streams and mill rock and ball charge levels, detailed earlier in the series, are utilised in a simulation environment. A multi-variable, model predictive (MPC) controller simulation is developed from plant data and utilised to investigate the potential of utilising the inferential models in a mill charge control strategy. An operating curve is generated and discussed in terms of possible utilisation in conjunction with an MPC controller. The results are encouraging and potential avenues for further research are discussed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000259 [article] Inferential measurement of SAG mill parameters V : MPC simulation [texte imprimé] / T. A. Apelt, Auteur ; N.F. Thornhill, Auteur . - 2009 . - pp. 1045–1052. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1045–1052 Mots-clés : SAG  milling  Autogenous  grinding  Modelling  Simulation  Process  control Résumé : This paper discusses a case study application of inferential measurement models for semiautogenous grinding (SAG) mills and is the last in a five-part series on Inferential Measurement of SAG Mill Parameters. Inferential measurements of SAG mill discharge and feed streams and mill rock and ball charge levels, detailed earlier in the series, are utilised in a simulation environment. A multi-variable, model predictive (MPC) controller simulation is developed from plant data and utilised to investigate the potential of utilising the inferential models in a mill charge control strategy. An operating curve is generated and discussed in terms of possible utilisation in conjunction with an MPC controller. The results are encouraging and potential avenues for further research are discussed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000259

Reinforced terraced fields method for fine tailings disposal / Zuoan Wei in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1053–1059 Titre : Reinforced terraced fields method for fine tailings disposal Type de document : texte imprimé Auteurs : Zuoan Wei, Auteur ; Guangzhi Yin, Auteur ; Guangzhi Li, Auteur Année de publication : 2009 Article en page(s) : pp. 1053–1059 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Tailings  Tailings  disposal  Non-ferrous  metallic  ores  Environmental  Mining Résumé : New mining technologies can exploit low-grade ores but they produce high volumes of waste, such as tailings. Further, current mineral processing techniques produce more and more fine tailings. How to dispose of these tailings is a key issue in the sustainable operation of a mine. A traditional method is to construct a settling or tailings pond for storage. Such a method requires sufficient coarse particles to raise a dam or embankment. However, the fine tailings contain little coarse particles and have poor mechanical properties. The stability of a tailings dam thus becomes a major issue if the traditional method is used. According to statistical data, all fine tailings dams or ponds in China have failed or have failure potential. Therefore, fine tailings disposal is a challenge to mine operators and new disposal methods should be explored for the stability improvement of tailings dams. In this paper, an innovative method of reinforced terraced fields is presented to satisfy the specific requirement of fine tailings disposal. By using an actual mine, this paper reports in detail the design concept and procedures for this method. Its feasibility is evaluated and its fundamental are analyzed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000983 [article] Reinforced terraced fields method for fine tailings disposal [texte imprimé] / Zuoan Wei, Auteur ; Guangzhi Yin, Auteur ; Guangzhi Li, Auteur . - 2009 . - pp. 1053–1059. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1053–1059 Mots-clés : Tailings  Tailings  disposal  Non-ferrous  metallic  ores  Environmental  Mining Résumé : New mining technologies can exploit low-grade ores but they produce high volumes of waste, such as tailings. Further, current mineral processing techniques produce more and more fine tailings. How to dispose of these tailings is a key issue in the sustainable operation of a mine. A traditional method is to construct a settling or tailings pond for storage. Such a method requires sufficient coarse particles to raise a dam or embankment. However, the fine tailings contain little coarse particles and have poor mechanical properties. The stability of a tailings dam thus becomes a major issue if the traditional method is used. According to statistical data, all fine tailings dams or ponds in China have failed or have failure potential. Therefore, fine tailings disposal is a challenge to mine operators and new disposal methods should be explored for the stability improvement of tailings dams. In this paper, an innovative method of reinforced terraced fields is presented to satisfy the specific requirement of fine tailings disposal. By using an actual mine, this paper reports in detail the design concept and procedures for this method. Its feasibility is evaluated and its fundamental are analyzed. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000983

A novel approach to the geometallurgical modelling of the Collahuasi grinding circuit / O. M. Alruiz in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1060–1067 Titre : A novel approach to the geometallurgical modelling of the Collahuasi grinding circuit Type de document : texte imprimé Auteurs : O. M. Alruiz, Auteur ; S. Morrell, Auteur ; C. J. Suazo, Auteur Année de publication : 2009 Article en page(s) : pp. 1060–1067 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Grinding  Modelling  Simulation  Sulphides  ore Résumé : Compañía Minera Doña Inés de Collahuasi SCM initiated the development of a new geometallurgical model to characterize its Rosario deposit in terms of its comminution circuit capacity and flotation performance. The comminution component of the model is now complete and is described in detail in this article. The model uses a combination of simulation and power-based approaches to relate ore hardness and flotation feed size to grinding circuit throughput. Ore hardness values are provided by Collahuasi’s block model which has been populated with ore characterisation data derived from Bond ball work index tests, JK drop-weight tests and SMC Tests® on diamond drill cores. The influences of planned and unplanned maintenance downtime are taken into account both in terms of frequency and duration. The accuracy of the model is demonstrated using weekly production data taken from the period January–December 2008, showing an average relative error of 5.2% and an R2 value of 0.95. The model is now in successful routine use at the mine for planning purposes and is currently in the process of being further developed to incorporate the response of the flotation circuit. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000995 [article] A novel approach to the geometallurgical modelling of the Collahuasi grinding circuit [texte imprimé] / O. M. Alruiz, Auteur ; S. Morrell, Auteur ; C. J. Suazo, Auteur . - 2009 . - pp. 1060–1067. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1060–1067 Mots-clés : Grinding  Modelling  Simulation  Sulphides  ore Résumé : Compañía Minera Doña Inés de Collahuasi SCM initiated the development of a new geometallurgical model to characterize its Rosario deposit in terms of its comminution circuit capacity and flotation performance. The comminution component of the model is now complete and is described in detail in this article. The model uses a combination of simulation and power-based approaches to relate ore hardness and flotation feed size to grinding circuit throughput. Ore hardness values are provided by Collahuasi’s block model which has been populated with ore characterisation data derived from Bond ball work index tests, JK drop-weight tests and SMC Tests® on diamond drill cores. The influences of planned and unplanned maintenance downtime are taken into account both in terms of frequency and duration. The accuracy of the model is demonstrated using weekly production data taken from the period January–December 2008, showing an average relative error of 5.2% and an R2 value of 0.95. The model is now in successful routine use at the mine for planning purposes and is currently in the process of being further developed to incorporate the response of the flotation circuit. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000995

Solvent extraction of gold(I) from alkaline cyanide solutions by the cetylpyridinium bromide/tributylphosphate system / Xiangjun Yang in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1068–1072 Titre : Solvent extraction of gold(I) from alkaline cyanide solutions by the cetylpyridinium bromide/tributylphosphate system Type de document : texte imprimé Auteurs : Xiangjun Yang, Auteur ; Xueling Li, Auteur ; Kun Huang, Auteur Année de publication : 2009 Article en page(s) : pp. 1068–1072 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Solvent  extraction  Gold  Cyanidation Résumé : This paper explores the solvent extraction of KAu(CN)2 from alkaline cyanide solutions using quaternary ammonium cetylpyridinium bromide (CPB) as an extractant with the addition of tributylphosphate (TBP) as a modifier. It also investigates the influence of several variables on gold extraction, including the molar ratio (β) of CPB to Au(I), the volume percentage of TBP (φTBP), NaCl concentration, phase ratio (AQ/ORG), and gold concentration in the aqueous phase. The results indicate that nearly all of the Au(I) (>98%) was transferred from the aqueous phase into the organic phase when β = 1 and φTBP = 30 vol%. We also carried out experiments for treating 20 L synthetic aurocyanide solution containing 10 mg/L Au(I) with column-shaped extraction equipment. The results demonstrated the recovery of more than 94.5% of Au(I) after two successive stages of extraction, and the Au(I) concentration in the raffinate was less than 0.5 mg/L. KSCN solution was used to strip the gold-loaded organic phase, and about 90% of Au(I) could be reverse extracted into the aqueous phase when the KSCN concentration reached 3.0 mol/L. The results obtained in this paper establish that the CPB/TBP extraction system has potential for practical application in the extraction and separation of gold from alkaline aurocyanide solutions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001022 [article] Solvent extraction of gold(I) from alkaline cyanide solutions by the cetylpyridinium bromide/tributylphosphate system [texte imprimé] / Xiangjun Yang, Auteur ; Xueling Li, Auteur ; Kun Huang, Auteur . - 2009 . - pp. 1068–1072. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1068–1072 Mots-clés : Solvent  extraction  Gold  Cyanidation Résumé : This paper explores the solvent extraction of KAu(CN)2 from alkaline cyanide solutions using quaternary ammonium cetylpyridinium bromide (CPB) as an extractant with the addition of tributylphosphate (TBP) as a modifier. It also investigates the influence of several variables on gold extraction, including the molar ratio (β) of CPB to Au(I), the volume percentage of TBP (φTBP), NaCl concentration, phase ratio (AQ/ORG), and gold concentration in the aqueous phase. The results indicate that nearly all of the Au(I) (>98%) was transferred from the aqueous phase into the organic phase when β = 1 and φTBP = 30 vol%. We also carried out experiments for treating 20 L synthetic aurocyanide solution containing 10 mg/L Au(I) with column-shaped extraction equipment. The results demonstrated the recovery of more than 94.5% of Au(I) after two successive stages of extraction, and the Au(I) concentration in the raffinate was less than 0.5 mg/L. KSCN solution was used to strip the gold-loaded organic phase, and about 90% of Au(I) could be reverse extracted into the aqueous phase when the KSCN concentration reached 3.0 mol/L. The results obtained in this paper establish that the CPB/TBP extraction system has potential for practical application in the extraction and separation of gold from alkaline aurocyanide solutions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001022

Influence of NaOH solution on the synthesis of fly ash geopolymer / Ubolluk Rattanasak in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1073–1078 Titre : Influence of NaOH solution on the synthesis of fly ash geopolymer Type de document : texte imprimé Auteurs : Ubolluk Rattanasak, Auteur ; Prinya Chindaprasirt, Auteur Année de publication : 2009 Article en page(s) : pp. 1073–1078 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Industrial  minerals  Cementation  Leaching  Waste  processing Résumé : A study was conducted on leaching of fly ash mixed with NaOH solution and on mixing procedure for preparing geopolymer. Leaching of SiO2 and Al2O3 was investigated by mixing fly ash with NaOH solution for different time intervals and leachates were analyzed in terms of silica and alumina contents. To make geopolymer paste, separate mixing and normal mixing were used. For separate mixing, NaOH solution was mixed with fly ash for the first 10 min; subsequently sodium silicate solution was added into the mixture. For normal mixing, fly ash, sodium hydroxide and sodium silicate solution were incorporated and mixed at the same time. Geopolymers were cured at 65 °C for 48 h. Microstructure of paste and compressive strength of mortar were investigated. Results revealed that solubility of fly ash depended on concentration of NaOH and duration of mixing with NaOH. For mixing procedure, separate mixing gave slightly better strength mortar than normal mixing. High strength geopolymer mortar up to 70.0 MPa was obtained when the mixture was formulated with 10 M NaOH and sodium silicate to NaOH ratio of 1.0, and the separate mixing sequence was used. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001034 [article] Influence of NaOH solution on the synthesis of fly ash geopolymer [texte imprimé] / Ubolluk Rattanasak, Auteur ; Prinya Chindaprasirt, Auteur . - 2009 . - pp. 1073–1078. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1073–1078 Mots-clés : Industrial  minerals  Cementation  Leaching  Waste  processing Résumé : A study was conducted on leaching of fly ash mixed with NaOH solution and on mixing procedure for preparing geopolymer. Leaching of SiO2 and Al2O3 was investigated by mixing fly ash with NaOH solution for different time intervals and leachates were analyzed in terms of silica and alumina contents. To make geopolymer paste, separate mixing and normal mixing were used. For separate mixing, NaOH solution was mixed with fly ash for the first 10 min; subsequently sodium silicate solution was added into the mixture. For normal mixing, fly ash, sodium hydroxide and sodium silicate solution were incorporated and mixed at the same time. Geopolymers were cured at 65 °C for 48 h. Microstructure of paste and compressive strength of mortar were investigated. Results revealed that solubility of fly ash depended on concentration of NaOH and duration of mixing with NaOH. For mixing procedure, separate mixing gave slightly better strength mortar than normal mixing. High strength geopolymer mortar up to 70.0 MPa was obtained when the mixture was formulated with 10 M NaOH and sodium silicate to NaOH ratio of 1.0, and the separate mixing sequence was used. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001034

Flotation in a novel oscillatory baffled column / C. J. Anderson in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1079–1087 Titre : Flotation in a novel oscillatory baffled column Type de document : texte imprimé Auteurs : C. J. Anderson, Auteur ; M.C. Harris, Auteur ; D.A. Deglon, Auteur Année de publication : 2009 Article en page(s) : pp. 1079–1087 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation  machines  Column  flotation  Flotation  kinetics  Fine  particle  processing Résumé : This paper presents an evaluation of an oscillatory baffled column (OBC) as a novel flotation device. The cell is based on a standard column design but employs a novel agitation mechanism where a series of baffle plates are oscillated sinusoidally through the fluid. This type of agitation has been shown to produce a more evenly distributed shear rate in the cell and allows the effect of agitation on particle–bubble contacting to be decoupled from gas dispersion effects. The column was first characterised in terms of mixing and gas dispersion, before being flotation tested using a quartz-amine system. Results indicated that the OBC was able to improve the flotation rate constant by up to 60% for fine particles (<30 μm) and by between 30% and 40% for coarser particles, relative to a standard flotation column. Interestingly, optimal flotation performance was obtained at power intensities orders of magnitude lower than those found in similar studies in stirred systems. This is believed to arise from the even distribution of shear in the OBC together with the oscillatory motion of the fluid in the cell. This oscillatory motion does not contribute to the average power intensity in the fluid and therefore results in more fluid motion per unit energy than would be obtained in a conventional stirred system. The OBC was therefore able to significantly improve flotation rates at power intensities orders of magnitude lower than those found in conventional cells. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001174 [article] Flotation in a novel oscillatory baffled column [texte imprimé] / C. J. Anderson, Auteur ; M.C. Harris, Auteur ; D.A. Deglon, Auteur . - 2009 . - pp. 1079–1087. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1079–1087 Mots-clés : Flotation  machines  Column  flotation  Flotation  kinetics  Fine  particle  processing Résumé : This paper presents an evaluation of an oscillatory baffled column (OBC) as a novel flotation device. The cell is based on a standard column design but employs a novel agitation mechanism where a series of baffle plates are oscillated sinusoidally through the fluid. This type of agitation has been shown to produce a more evenly distributed shear rate in the cell and allows the effect of agitation on particle–bubble contacting to be decoupled from gas dispersion effects. The column was first characterised in terms of mixing and gas dispersion, before being flotation tested using a quartz-amine system. Results indicated that the OBC was able to improve the flotation rate constant by up to 60% for fine particles (<30 μm) and by between 30% and 40% for coarser particles, relative to a standard flotation column. Interestingly, optimal flotation performance was obtained at power intensities orders of magnitude lower than those found in similar studies in stirred systems. This is believed to arise from the even distribution of shear in the OBC together with the oscillatory motion of the fluid in the cell. This oscillatory motion does not contribute to the average power intensity in the fluid and therefore results in more fluid motion per unit energy than would be obtained in a conventional stirred system. The OBC was therefore able to significantly improve flotation rates at power intensities orders of magnitude lower than those found in conventional cells. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001174

Pipe lining abrasion testing for paste backfill operations / David Hewitt in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1088–1090 Titre : Pipe lining abrasion testing for paste backfill operations Type de document : texte imprimé Auteurs : David Hewitt, Auteur ; Sebastian Allard, Auteur ; Peter Radziszewski, Auteur Année de publication : 2009 Article en page(s) : pp. 1088–1090 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mineral  processing  Waste  processing  Tailings  Tailings  disposal Résumé : Pipe wear in paste backfill mining operations represents a great cost to mining companies. The replacement of prematurely worn pipes results in the shut down of the entire paste system. Abrasion testing performed on various pipe lining samples yielded both quantitative and qualitative data. Both standard and non-standard methods were explored during testing. The pipe materials are ranked by their relative wear resistance as well as energy per unit mass loss. The latter may allow for better prediction of pipe wear, this in turn could prove worthwhile when scheduling maintenance downtime for such a system where cost savings would be beneficial. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000818 [article] Pipe lining abrasion testing for paste backfill operations [texte imprimé] / David Hewitt, Auteur ; Sebastian Allard, Auteur ; Peter Radziszewski, Auteur . - 2009 . - pp. 1088–1090. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1088–1090 Mots-clés : Mineral  processing  Waste  processing  Tailings  Tailings  disposal Résumé : Pipe wear in paste backfill mining operations represents a great cost to mining companies. The replacement of prematurely worn pipes results in the shut down of the entire paste system. Abrasion testing performed on various pipe lining samples yielded both quantitative and qualitative data. Both standard and non-standard methods were explored during testing. The pipe materials are ranked by their relative wear resistance as well as energy per unit mass loss. The latter may allow for better prediction of pipe wear, this in turn could prove worthwhile when scheduling maintenance downtime for such a system where cost savings would be beneficial. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000818

Analysis and optimization of cone crusher performance / Dong Gang in Minerals engineering, Vol. 22 N° 12 (Octobre 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1091–1093 Titre : Analysis and optimization of cone crusher performance Type de document : texte imprimé Auteurs : Dong Gang, Auteur ; Fan Xiumin, Auteur ; Huang Dongming, Auteur Année de publication : 2009 Article en page(s) : pp. 1091–1093 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Crushing  Mineral  processing  Modelling  Classification  Particle  size Résumé : Solving practical problems in cone crusher design, the quantity of rock material falling out of the crushing chamber during one eccentric rotation of the cone was analyzed. A simple and practical model for predicting cone crusher output is proposed. Based on previous research a model able to directly calculate the mass percentage of flakiness in the product has been obtained and a method of analysing the variation of the flakiness percentage in the process of crushing is proposed. Taking the output prediction model as an objective function, and the size reduction model and flakiness prediction model as constraints, optimization of the cone crusher has been achieved. The validity of this optimization was verified via full-scale testing. This work will prove useful for developing further cone crusher improvement strategies. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001058 [article] Analysis and optimization of cone crusher performance [texte imprimé] / Dong Gang, Auteur ; Fan Xiumin, Auteur ; Huang Dongming, Auteur . - 2009 . - pp. 1091–1093. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 12 (Octobre 2009) . - pp. 1091–1093 Mots-clés : Crushing  Mineral  processing  Modelling  Classification  Particle  size Résumé : Solving practical problems in cone crusher design, the quantity of rock material falling out of the crushing chamber during one eccentric rotation of the cone was analyzed. A simple and practical model for predicting cone crusher output is proposed. Based on previous research a model able to directly calculate the mass percentage of flakiness in the product has been obtained and a method of analysing the variation of the flakiness percentage in the process of crushing is proposed. Taking the output prediction model as an objective function, and the size reduction model and flakiness prediction model as constraints, optimization of the cone crusher has been achieved. The validity of this optimization was verified via full-scale testing. This work will prove useful for developing further cone crusher improvement strategies. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001058

Exemplaires

Bibliothèque Ecole Nationale Polytechnique d'Alger

Accueil

Se connecter

Météo

Adresse