Dépouillements

Column flotation simulation and control / Jocelyn Bouchard in Minerals engineering, Vol. 22 N° 6 (Mai 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 519–529 Titre : Column flotation simulation and control : An overview Type de document : texte imprimé Auteurs : Jocelyn Bouchard, Auteur ; André Desbiens, Auteur ; René Del Villar, Auteur Année de publication : 2009 Article en page(s) : pp. 519–529 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Column  flotation  Modelling  Simulation  Process  control Résumé : Even after having been used for several years in mineral processing plants, the full potential of the column flotation process is still not fully exploited. There is obviously more than one reason explaining this, but one important contributing factor is certainly the under usage of available control capabilities. Researchers and practitioners have been interested in column flotation simulation and control for more than two decades. This paper provides an overview of the literature focused on these specific fields of research. It also discusses some future investigative issues and how the current industry may benefit from past developments. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000466 [article] Column flotation simulation and control : An overview [texte imprimé] / Jocelyn Bouchard, Auteur ; André Desbiens, Auteur ; René Del Villar, Auteur . - 2009 . - pp. 519–529. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 519–529 Mots-clés : Column  flotation  Modelling  Simulation  Process  control Résumé : Even after having been used for several years in mineral processing plants, the full potential of the column flotation process is still not fully exploited. There is obviously more than one reason explaining this, but one important contributing factor is certainly the under usage of available control capabilities. Researchers and practitioners have been interested in column flotation simulation and control for more than two decades. This paper provides an overview of the literature focused on these specific fields of research. It also discusses some future investigative issues and how the current industry may benefit from past developments. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000466

Selective extraction of nickel from ammoniacal solutions containing nickel and cobalt by emulsion liquid membrane using 5,7-dibromo-8-hydroxyquinoline (DBHQ) as extractant / R.A. Kumbasar in Minerals engineering, Vol. 22 N° 6 (Mai 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 530–536 Titre : Selective extraction of nickel from ammoniacal solutions containing nickel and cobalt by emulsion liquid membrane using 5,7-dibromo-8-hydroxyquinoline (DBHQ) as extractant Type de document : texte imprimé Auteurs : R.A. Kumbasar, Auteur Année de publication : 2009 Article en page(s) : pp. 530–536 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Hydrometallurgy  Solvent  extraction  Nickel  Cobalt  Liquid  membranes Résumé : The selective extraction and concentration of nickel from ammoniacal solutions containing nickel and cobalt by an emulsion liquid membrane (ELM) technique using 5,7-dibromo-8-hydroxyquinoline (DBHQ) as extractant has been presented. ELM consists of a diluent (kerosene), a surfactant (Span 80), an extractant (DBHQ), a modifier (tributyl phosphate), and a stripping solution (very dilute sulfuric acid solution containing EDTA as complexing agent, buffered at pH 4.25). Cobalt (II) in feed solution with 6 mol/L ammonia was oxidised to Cobalt (III) by H2O2 and pH of this ammoniacal solution was adjusted to 10.0 with the addition of hydrochloric acid (HCl). The important variables governing the permeation of nickel and their effect on the separation process have been studied. These variables were membrane composition, ammonia concentration in the feed solution, mixing speed, surfactant concentration, extractant concentration, pH of the feed and the stripping solutions, complexing agent concentration in the stripping solution, and phase ratio. After the optimum conditions had been determined, it was possible to selectively extract 99% of nickel from the ammoniacal solutions containing Ni and Co. The separation factors of nickel with respect to cobalt, based on initial feed concentration, have experimentally found to be of as high as 88.1 for about equimolar Co–Ni feed solutions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001854 [article] Selective extraction of nickel from ammoniacal solutions containing nickel and cobalt by emulsion liquid membrane using 5,7-dibromo-8-hydroxyquinoline (DBHQ) as extractant [texte imprimé] / R.A. Kumbasar, Auteur . - 2009 . - pp. 530–536. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 530–536 Mots-clés : Hydrometallurgy  Solvent  extraction  Nickel  Cobalt  Liquid  membranes Résumé : The selective extraction and concentration of nickel from ammoniacal solutions containing nickel and cobalt by an emulsion liquid membrane (ELM) technique using 5,7-dibromo-8-hydroxyquinoline (DBHQ) as extractant has been presented. ELM consists of a diluent (kerosene), a surfactant (Span 80), an extractant (DBHQ), a modifier (tributyl phosphate), and a stripping solution (very dilute sulfuric acid solution containing EDTA as complexing agent, buffered at pH 4.25). Cobalt (II) in feed solution with 6 mol/L ammonia was oxidised to Cobalt (III) by H2O2 and pH of this ammoniacal solution was adjusted to 10.0 with the addition of hydrochloric acid (HCl). The important variables governing the permeation of nickel and their effect on the separation process have been studied. These variables were membrane composition, ammonia concentration in the feed solution, mixing speed, surfactant concentration, extractant concentration, pH of the feed and the stripping solutions, complexing agent concentration in the stripping solution, and phase ratio. After the optimum conditions had been determined, it was possible to selectively extract 99% of nickel from the ammoniacal solutions containing Ni and Co. The separation factors of nickel with respect to cobalt, based on initial feed concentration, have experimentally found to be of as high as 88.1 for about equimolar Co–Ni feed solutions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508001854

Improving particle size measurement using multi-flash imaging / T.K. Koh in Minerals engineering, Vol. 22 N° 6 (Mai 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 537–543 Titre : Improving particle size measurement using multi-flash imaging Type de document : texte imprimé Auteurs : T.K. Koh, Auteur ; N.J. Miles, Auteur ; S.P. Morgan, Auteur Année de publication : 2009 Article en page(s) : pp. 537–543 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Online-analysis  Particle  size Résumé : An accurate calculation of the size distribution of coarse particles is crucial in the mining and quarrying industry. Machine vision has the capability to overcome many inherent limitations of traditional sieving methods and is an active research area. However, inaccurate image segmentation of particles through software based algorithms is a significant source of error. In this paper, a hardware based approach to improving image segmentation is demonstrated using multi-flash Imaging (MFI), where multiple images captured with different illumination allows depth edges around a particle to be captured through shadow information. The MFI method is compared with conventional segmentation methods such as watershed and Canny edge detection. In order to provide more accurate evaluation of performance wooden spheres of known diameter were evaluated. Imaging the size distribution of pebbles provided a practical scenario in the evaluation of MFI. The results revealed that MFI produced more accurate size estimations than conventional segmentation techniques for both the wooden spheres and pebbles, demonstrating the potential for future use in the mining industry. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002793 [article] Improving particle size measurement using multi-flash imaging [texte imprimé] / T.K. Koh, Auteur ; N.J. Miles, Auteur ; S.P. Morgan, Auteur . - 2009 . - pp. 537–543. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 537–543 Mots-clés : Online-analysis  Particle  size Résumé : An accurate calculation of the size distribution of coarse particles is crucial in the mining and quarrying industry. Machine vision has the capability to overcome many inherent limitations of traditional sieving methods and is an active research area. However, inaccurate image segmentation of particles through software based algorithms is a significant source of error. In this paper, a hardware based approach to improving image segmentation is demonstrated using multi-flash Imaging (MFI), where multiple images captured with different illumination allows depth edges around a particle to be captured through shadow information. The MFI method is compared with conventional segmentation methods such as watershed and Canny edge detection. In order to provide more accurate evaluation of performance wooden spheres of known diameter were evaluated. Imaging the size distribution of pebbles provided a practical scenario in the evaluation of MFI. The results revealed that MFI produced more accurate size estimations than conventional segmentation techniques for both the wooden spheres and pebbles, demonstrating the potential for future use in the mining industry. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002793

Predicting the overall specific energy requirement of crushing, high pressure grinding roll and tumbling mill circuits / S. Morrell in Minerals engineering, Vol. 22 N° 6 (Mai 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 544–549 Titre : Predicting the overall specific energy requirement of crushing, high pressure grinding roll and tumbling mill circuits Type de document : texte imprimé Auteurs : S. Morrell, Auteur Année de publication : 2009 Article en page(s) : pp. 544–549 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Grinding  SAG  milling Résumé : In a previous paper [Morrell, S. 2008a. A method for predicting the specific energy requirement of comminution circuits and assessing their energy utilisation efficiency. Minerals Engineering 21(3), 5–9] an approach was described which enabled the specific energy of tumbling mills such as Autogenous (AG), Semi-autogenous (SAG) and ball mills to be estimated from laboratory-derived ore characterisation data. The following paper extends this approach to encompass jaw, gyratory and cone crushers as well as High Pressure Grinding Rolls (HPGR). The technique is applied to three different comminution circuits and their overall specific energies are compared. All of the calculations involved are described in detail in an appendix. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000077 [article] Predicting the overall specific energy requirement of crushing, high pressure grinding roll and tumbling mill circuits [texte imprimé] / S. Morrell, Auteur . - 2009 . - pp. 544–549. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 544–549 Mots-clés : Grinding  SAG  milling Résumé : In a previous paper [Morrell, S. 2008a. A method for predicting the specific energy requirement of comminution circuits and assessing their energy utilisation efficiency. Minerals Engineering 21(3), 5–9] an approach was described which enabled the specific energy of tumbling mills such as Autogenous (AG), Semi-autogenous (SAG) and ball mills to be estimated from laboratory-derived ore characterisation data. The following paper extends this approach to encompass jaw, gyratory and cone crushers as well as High Pressure Grinding Rolls (HPGR). The technique is applied to three different comminution circuits and their overall specific energies are compared. All of the calculations involved are described in detail in an appendix. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000077

An experimental investigation into the oxidation of four pyritic shales from Western Australia / Meining Song in Minerals engineering, Vol. 22 N° 6 (Mai 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 550–559 Titre : An experimental investigation into the oxidation of four pyritic shales from Western Australia Type de document : texte imprimé Auteurs : Meining Song, Auteur ; Dongke Zhang, Auteur Année de publication : 2009 Article en page(s) : pp. 550–559 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Acid  rock  drainage  Environmental  Sulphide  ores  Oxidation  Ore  mineralogy Résumé : The oxidation of pyritic shale under different experimental conditions was studied using an isothermal batch reactor technique. Four pyritic shale samples collected from different areas of an iron ore mine with different stratigraphic compositions in Western Australia were employed in this study. The influence of shale properties on the oxidation of pyritic shale was studied. It was found that the reaction rate constant k (L kg−1 h−1) of the shale oxidation as measured with the present isothermal reactor technique on a per unit pyrite mass basis, was not constant for the different shales and was dependent on their physical properties, where increasing grain size and increasing encapsulation of pyrite grains both result in decreased surface exposure of pyrite to oxidation (per unit mass) which coincides with a decrease in the oxidation rate of pyritic shale (per unit mass). This study demonstrates that pyrite grain size and encapsulation are important parameters for the interpretation and evaluation of acid mine drainage potential associated with individual shales. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000089 [article] An experimental investigation into the oxidation of four pyritic shales from Western Australia [texte imprimé] / Meining Song, Auteur ; Dongke Zhang, Auteur . - 2009 . - pp. 550–559. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 550–559 Mots-clés : Acid  rock  drainage  Environmental  Sulphide  ores  Oxidation  Ore  mineralogy Résumé : The oxidation of pyritic shale under different experimental conditions was studied using an isothermal batch reactor technique. Four pyritic shale samples collected from different areas of an iron ore mine with different stratigraphic compositions in Western Australia were employed in this study. The influence of shale properties on the oxidation of pyritic shale was studied. It was found that the reaction rate constant k (L kg−1 h−1) of the shale oxidation as measured with the present isothermal reactor technique on a per unit pyrite mass basis, was not constant for the different shales and was dependent on their physical properties, where increasing grain size and increasing encapsulation of pyrite grains both result in decreased surface exposure of pyrite to oxidation (per unit mass) which coincides with a decrease in the oxidation rate of pyritic shale (per unit mass). This study demonstrates that pyrite grain size and encapsulation are important parameters for the interpretation and evaluation of acid mine drainage potential associated with individual shales. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000089

Utilization of soluble starch as a depressant for the reverse flotation of diaspore from kaolinite / Liuyin Xia in Minerals engineering, Vol. 22 N° 6 (Mai 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 560–565 Titre : Utilization of soluble starch as a depressant for the reverse flotation of diaspore from kaolinite Type de document : texte imprimé Auteurs : Liuyin Xia, Auteur ; Zhong Hong, Auteur ; Guangyi Liu, Auteur Année de publication : 2009 Article en page(s) : pp. 560–565 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Froth  flotation  Oxide  ores  Flotation  depressants Résumé : The utilization of a non-toxic natural polysaccharide, soluble starch, in the flotation of diaspore and kaolinite with emphasis on depression of diaspore in the reverse flotation of bauxite ores by using a Gemini cationic collector, is reported in this work. Firstly, the depressant effect of soluble starch was studied by pure mineral micro-flotation of diaspore and kaolinite as functions of the depressant dosage and pulp pH. The results show that soluble starch depresses diaspore much better than kaolinite. When pH is over 10, a satisfactory separation of the alumina and the silicate minerals can be approached. Moreover, micro-flotation tests of artificial mixed minerals and bench scale reverse flotation of the diasporic bauxite ore was complementing conducted. The non-charged starch is highly proved to be an effective and selective depressant for the reverse flotation of diaspore from the gangue minerals like kaolinite. By zeta potential measurement, adsorption studies and D-IR spectra analysis, the mechanism of interaction between starch and the diaspore surfaces is established, which is the formation of a five membered ring complexes on mineral substrates. The number of broken Al–O bonds of diaspore is much more than that of kaolinite, so the selectivity separation of diaspore from kaolinite in this system is feasible. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000090 [article] Utilization of soluble starch as a depressant for the reverse flotation of diaspore from kaolinite [texte imprimé] / Liuyin Xia, Auteur ; Zhong Hong, Auteur ; Guangyi Liu, Auteur . - 2009 . - pp. 560–565. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 560–565 Mots-clés : Froth  flotation  Oxide  ores  Flotation  depressants Résumé : The utilization of a non-toxic natural polysaccharide, soluble starch, in the flotation of diaspore and kaolinite with emphasis on depression of diaspore in the reverse flotation of bauxite ores by using a Gemini cationic collector, is reported in this work. Firstly, the depressant effect of soluble starch was studied by pure mineral micro-flotation of diaspore and kaolinite as functions of the depressant dosage and pulp pH. The results show that soluble starch depresses diaspore much better than kaolinite. When pH is over 10, a satisfactory separation of the alumina and the silicate minerals can be approached. Moreover, micro-flotation tests of artificial mixed minerals and bench scale reverse flotation of the diasporic bauxite ore was complementing conducted. The non-charged starch is highly proved to be an effective and selective depressant for the reverse flotation of diaspore from the gangue minerals like kaolinite. By zeta potential measurement, adsorption studies and D-IR spectra analysis, the mechanism of interaction between starch and the diaspore surfaces is established, which is the formation of a five membered ring complexes on mineral substrates. The number of broken Al–O bonds of diaspore is much more than that of kaolinite, so the selectivity separation of diaspore from kaolinite in this system is feasible. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000090

Energy dispersive X-ray diffraction spectroscopy for rapid estimation of calcite in copper ores / P. Escárate in Minerals engineering, Vol. 22 N° 6 (Mai 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 566–571 Titre : Energy dispersive X-ray diffraction spectroscopy for rapid estimation of calcite in copper ores Type de document : texte imprimé Auteurs : P. Escárate, Auteur ; D. Bailo, Auteur ; A. Guesalaga, Auteur Année de publication : 2009 Article en page(s) : pp. 566–571 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Calcite  Copper  Spectroscopy  Diffraction  Fluorescence Résumé : This article presents a novel technique for measuring the concentration of calcite in copper ore samples using energy dispersive X-ray diffraction (ED-XRD). The results are compared with ultraviolet fluorescence spectroscopy (UVF) for the same group of samples. This approach substantially shortens the measuring time with respect to the current laboratory procedures from 300 min down to 15 min and 9 min for energy dispersive X-ray diffraction and ultraviolet fluorescence spectroscopy, respectively, while preserving a good accuracy level (RMSE < 0.577). The models used for data processing were calibrated and validated for both techniques via the correlation coefficients (View the MathML source and View the MathML source), the error of prediction (RMSEP) and the error of calibration (RMSEC). View the MathML source values between 0.88 and 0.94 were obtained for UVF and ED-XRD data, respectively. The calibration and validation were performed for calcite concentration ranges of 3.4–10.7% in the case of UVF and 2.9–7.6% for ED-XRD. The results reported show the potential of this method for on-line estimation of calcite concentration. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000247 [article] Energy dispersive X-ray diffraction spectroscopy for rapid estimation of calcite in copper ores [texte imprimé] / P. Escárate, Auteur ; D. Bailo, Auteur ; A. Guesalaga, Auteur . - 2009 . - pp. 566–571. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 566–571 Mots-clés : Calcite  Copper  Spectroscopy  Diffraction  Fluorescence Résumé : This article presents a novel technique for measuring the concentration of calcite in copper ore samples using energy dispersive X-ray diffraction (ED-XRD). The results are compared with ultraviolet fluorescence spectroscopy (UVF) for the same group of samples. This approach substantially shortens the measuring time with respect to the current laboratory procedures from 300 min down to 15 min and 9 min for energy dispersive X-ray diffraction and ultraviolet fluorescence spectroscopy, respectively, while preserving a good accuracy level (RMSE < 0.577). The models used for data processing were calibrated and validated for both techniques via the correlation coefficients (View the MathML source and View the MathML source), the error of prediction (RMSEP) and the error of calibration (RMSEC). View the MathML source values between 0.88 and 0.94 were obtained for UVF and ED-XRD data, respectively. The calibration and validation were performed for calcite concentration ranges of 3.4–10.7% in the case of UVF and 2.9–7.6% for ED-XRD. The results reported show the potential of this method for on-line estimation of calcite concentration. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000247

Energetics of mechanical activation / C. Sasikumar in Minerals engineering, Vol. 22 N° 6 (Mai 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 572–574 Titre : Energetics of mechanical activation : Application to ilmenite Type de document : texte imprimé Auteurs : C. Sasikumar, Auteur ; S. Srikanth, Auteur ; N.K. Mukhopadhyay, Auteur Année de publication : 2009 Article en page(s) : pp. 572–574 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Oxide  ores  Grinding  Particle  size  Surface  modification  Mineral  processing Résumé : An attempt is made to measure the energy stored in the material during mechanical activation and its manifestation in various forms (defects, new surfaces and interfaces, strain and structural disorder) through direct energy measurements, calorimetry, surface area and surface energy measurements. The elastic strain, grain size and extent of amorphisation is estimated from XRD analysis. The strain energy is calculated using the theory of elasticity and the amorphisation energy from thermodynamic calculations. For ilmenite, the energy transferred to the material is about 6% of the specific energy consumption in 4 h of planetary milling. A major part of the energy is stored as elastic strain energy, structural disorder and in point and line defects whereas the energy stored in additional surfaces and grain boundaries are comparatively much lower. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000284 [article] Energetics of mechanical activation : Application to ilmenite [texte imprimé] / C. Sasikumar, Auteur ; S. Srikanth, Auteur ; N.K. Mukhopadhyay, Auteur . - 2009 . - pp. 572–574. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 572–574 Mots-clés : Oxide  ores  Grinding  Particle  size  Surface  modification  Mineral  processing Résumé : An attempt is made to measure the energy stored in the material during mechanical activation and its manifestation in various forms (defects, new surfaces and interfaces, strain and structural disorder) through direct energy measurements, calorimetry, surface area and surface energy measurements. The elastic strain, grain size and extent of amorphisation is estimated from XRD analysis. The strain energy is calculated using the theory of elasticity and the amorphisation energy from thermodynamic calculations. For ilmenite, the energy transferred to the material is about 6% of the specific energy consumption in 4 h of planetary milling. A major part of the energy is stored as elastic strain energy, structural disorder and in point and line defects whereas the energy stored in additional surfaces and grain boundaries are comparatively much lower. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000284

Exemplaires

Bibliothèque Ecole Nationale Polytechnique d'Alger

Accueil

Se connecter

Météo

Adresse