Dépouillements

Management of the Web of Water and Web of Materials / Antoinette Van Schaik in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 157–174 Titre : Management of the Web of Water and Web of Materials Type de document : texte imprimé Auteurs : Antoinette Van Schaik, Auteur ; Markus A. Reuter, Auteur ; Hein Van Stokkom, Auteur Année de publication : 2011 Article en page(s) : pp. 157–174 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : System  optimization  Sustainability  Waste  water  and  material  management  End-of-pipe  technology  Policy  Recycling Résumé : The European Water Framework Directive (EWFD) demands a detailed analysis to determine which changes and measures within the surface water system are required, which actors require detailed scrutiny, and which technology has to be developed in order to guarantee that the quality of the surface water is complying with this Directive. This paper will discuss a holistic model developed for the optimization of the surface water system for a water authority in The Netherlands, which is influenced by (i) waste water streams originating from e.g. households, industry, agricultural and transport activities among others and (ii) the end-of-pipe technology of waste water treatment plants, while interfacing with (iii) thermal treatment and minerals and metallurgical processing for the recovery of specific elements from waste water sludge and other residues created during waste water treatment. The paper develops a fundamental basis that can feed factual information such as optimal combination of measures (technology and policy) into sustainability frameworks or the implementation of the EWFD. This optimization is affected by quality constraints, costs, energy, environment and interactions between the various materials present in the different streams in the water system. By incorporating these parameters into the model a tool is provided that provides metrics to measure the ‘sustainability’ of the Web of Water (WoW), while linking to and harmonising with the Web of Materials/Metals (WoM). The WoW optimization model links material cycles from e.g. food, transport, agriculture and industry to the recovery of materials from the water cycle with the pyrometallurgical and thermal processing of minerals/materials, hence quantifying resource conservation and sustainability on the interface between aquatic and product manufacturing systems and the process industries. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002258 [article] Management of the Web of Water and Web of Materials [texte imprimé] / Antoinette Van Schaik, Auteur ; Markus A. Reuter, Auteur ; Hein Van Stokkom, Auteur . - 2011 . - pp. 157–174. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 157–174 Mots-clés : System  optimization  Sustainability  Waste  water  and  material  management  End-of-pipe  technology  Policy  Recycling Résumé : The European Water Framework Directive (EWFD) demands a detailed analysis to determine which changes and measures within the surface water system are required, which actors require detailed scrutiny, and which technology has to be developed in order to guarantee that the quality of the surface water is complying with this Directive. This paper will discuss a holistic model developed for the optimization of the surface water system for a water authority in The Netherlands, which is influenced by (i) waste water streams originating from e.g. households, industry, agricultural and transport activities among others and (ii) the end-of-pipe technology of waste water treatment plants, while interfacing with (iii) thermal treatment and minerals and metallurgical processing for the recovery of specific elements from waste water sludge and other residues created during waste water treatment. The paper develops a fundamental basis that can feed factual information such as optimal combination of measures (technology and policy) into sustainability frameworks or the implementation of the EWFD. This optimization is affected by quality constraints, costs, energy, environment and interactions between the various materials present in the different streams in the water system. By incorporating these parameters into the model a tool is provided that provides metrics to measure the ‘sustainability’ of the Web of Water (WoW), while linking to and harmonising with the Web of Materials/Metals (WoM). The WoW optimization model links material cycles from e.g. food, transport, agriculture and industry to the recovery of materials from the water cycle with the pyrometallurgical and thermal processing of minerals/materials, hence quantifying resource conservation and sustainability on the interface between aquatic and product manufacturing systems and the process industries. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002258

Incorporating sustainable development principles into minerals processing design and operation / G.D. Corder in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 175–181 Titre : Incorporating sustainable development principles into minerals processing design and operation : SUSOP® Type de document : texte imprimé Auteurs : G.D. Corder, Auteur ; B.C. McLellan, Auteur ; S. Green, Auteur Année de publication : 2011 Article en page(s) : pp. 175–181 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mining  Mineral  processing  Process  synthesis  Environmental  Sustainability Résumé : Throughout the conceptualisation, development, operation and eventual decommissioning of mineral resources projects, there is a wide range of opportunities to contribute to sustainable development (SD). Although some individual organisations have their own SD tools, a practical systematic, rigorous and standardised approach to capture SD opportunities in project management systems is not currently available. Recognising this limitation a collaborative research effort has been undertaken to develop SUSOP® (SUStainable OPerations), a new concept that is somewhat analogous to safety cases and hazard and operability studies (HAZOP) used by safety practitioners. This paper raises some of the important SD considerations for mineral industry operations and outlines the development of SUSOP® to date. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003008 [article] Incorporating sustainable development principles into minerals processing design and operation : SUSOP® [texte imprimé] / G.D. Corder, Auteur ; B.C. McLellan, Auteur ; S. Green, Auteur . - 2011 . - pp. 175–181. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 175–181 Mots-clés : Mining  Mineral  processing  Process  synthesis  Environmental  Sustainability Résumé : Throughout the conceptualisation, development, operation and eventual decommissioning of mineral resources projects, there is a wide range of opportunities to contribute to sustainable development (SD). Although some individual organisations have their own SD tools, a practical systematic, rigorous and standardised approach to capture SD opportunities in project management systems is not currently available. Recognising this limitation a collaborative research effort has been undertaken to develop SUSOP® (SUStainable OPerations), a new concept that is somewhat analogous to safety cases and hazard and operability studies (HAZOP) used by safety practitioners. This paper raises some of the important SD considerations for mineral industry operations and outlines the development of SUSOP® to date. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003008

Ranking and scoring potential environmental risks from solid mineral wastes / J. L. Broadhurst in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 182–191 Titre : Ranking and scoring potential environmental risks from solid mineral wastes Type de document : texte imprimé Auteurs : J. L. Broadhurst, Auteur ; J.G. Petrie, Auteur Année de publication : 2011 Article en page(s) : pp. 182–191 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Environmental  Pollution  Sulfide  ores  Tailings  disposal Résumé : The overall environmental performance of minerals beneficiation operations, in addition to their significant energy demand, is largely a function of the success or failure of waste management strategies to minimise the long-term impacts associated with the disposal of vast volumes of solid waste. Whilst forecasting such impacts, particularly in the early stages of a project, is arguably the most important element in an environmental performance assessment, it remains the most challenging. This paper describes a generic methodology which has been developed for ranking and scoring solid waste constituents on the basis of their hazard-forming potential and chemical behaviour under disposal conditions. The approach is demonstrated for the case of typical porphyry-type copper sulfide tailings. The predictive approach developed here is consistent with the screening phase of risk-based environmental assessment protocols, and is considered to be a vital and integral part of reliably quantifying the environmental life cycle impacts of solid mineral wastes. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002337 [article] Ranking and scoring potential environmental risks from solid mineral wastes [texte imprimé] / J. L. Broadhurst, Auteur ; J.G. Petrie, Auteur . - 2011 . - pp. 182–191. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 182–191 Mots-clés : Environmental  Pollution  Sulfide  ores  Tailings  disposal Résumé : The overall environmental performance of minerals beneficiation operations, in addition to their significant energy demand, is largely a function of the success or failure of waste management strategies to minimise the long-term impacts associated with the disposal of vast volumes of solid waste. Whilst forecasting such impacts, particularly in the early stages of a project, is arguably the most important element in an environmental performance assessment, it remains the most challenging. This paper describes a generic methodology which has been developed for ranking and scoring solid waste constituents on the basis of their hazard-forming potential and chemical behaviour under disposal conditions. The approach is demonstrated for the case of typical porphyry-type copper sulfide tailings. The predictive approach developed here is consistent with the screening phase of risk-based environmental assessment protocols, and is considered to be a vital and integral part of reliably quantifying the environmental life cycle impacts of solid mineral wastes. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002337

Dynamic modelling of E-waste recycling system performance based on product design / Antoinette Van Schaik in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 192–210 Titre : Dynamic modelling of E-waste recycling system performance based on product design Type de document : texte imprimé Auteurs : Antoinette Van Schaik, Auteur ; Markus A. Reuter, Auteur Année de publication : 2011 Article en page(s) : pp. 192–210 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Design  Liberation  modelling  Dynamic  modelling  System  modelling  Recycling  (Recyclate)  quality  E-waste Résumé : E-waste covers a wide range of products as well as dismantled and/or sorted components originating from these. Being able to predict the flow of materials and recycling performance for different E-waste types requires a fundamental and flexible basis in which E-waste design properties are linked to liberation and separation performance of recycling. This paper discusses the authors’ design-determined liberation and dynamic models to predict and monitor E-waste recycling technologically, economically and environmentally. The uniqueness of this work lies in the modelling of product design characteristics in terms of design tables that define the mass and material connections derived from the design in real-time. The shredding process is modelled by defining shredder connection, and shredder liberation tables, based on heuristic derived from extensive data collection on design and shredder experiments. This allows for the design-driven modelling of material liberation in the shredding process. The heuristic modelling of liberation behaviour and the prediction of particle composition and degree of liberation after shredding based on design-driven shredder modelling are a novel approach to link design to recyclate quality and recycling performance. Key to this work is that the multi- and mono-material composition of particles after liberation are not pre-defined as in earlier work, but are predicted as a function of design choices and can vary accordingly. The evolution of these models is underpinned by extensive industrial data collection on product design of various WEEE categories, which was used to define and calibrate the models. The time dependent characteristic of design and recycling technology requires the adoption of dynamic modelling to predict recycling performance over time. The discussed dynamic and predictive framework provides a first principles basis for the calculation of the dispersion of harmful/valuable elements and environmental impact. This optimizes the spending of money on large scale trials and monitoring test to establish these results. At the same time legislation and policy on recyclability of products can be tested if it stands the test of time or if new designs comply with environmental legislation in the future. Prediction of recycling performance, recyclate quality and toxicity as a function of product design, shredding and (future) recycling system configurations will be demonstrated in various industrial examples, which includes an evaluation if shredding is advisable or not for precious and platinum group elements recovery during recycling. Also the so important balance between energy recovery and feedstock recycling is shown. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002295 [article] Dynamic modelling of E-waste recycling system performance based on product design [texte imprimé] / Antoinette Van Schaik, Auteur ; Markus A. Reuter, Auteur . - 2011 . - pp. 192–210. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 192–210 Mots-clés : Design  Liberation  modelling  Dynamic  modelling  System  modelling  Recycling  (Recyclate)  quality  E-waste Résumé : E-waste covers a wide range of products as well as dismantled and/or sorted components originating from these. Being able to predict the flow of materials and recycling performance for different E-waste types requires a fundamental and flexible basis in which E-waste design properties are linked to liberation and separation performance of recycling. This paper discusses the authors’ design-determined liberation and dynamic models to predict and monitor E-waste recycling technologically, economically and environmentally. The uniqueness of this work lies in the modelling of product design characteristics in terms of design tables that define the mass and material connections derived from the design in real-time. The shredding process is modelled by defining shredder connection, and shredder liberation tables, based on heuristic derived from extensive data collection on design and shredder experiments. This allows for the design-driven modelling of material liberation in the shredding process. The heuristic modelling of liberation behaviour and the prediction of particle composition and degree of liberation after shredding based on design-driven shredder modelling are a novel approach to link design to recyclate quality and recycling performance. Key to this work is that the multi- and mono-material composition of particles after liberation are not pre-defined as in earlier work, but are predicted as a function of design choices and can vary accordingly. The evolution of these models is underpinned by extensive industrial data collection on product design of various WEEE categories, which was used to define and calibrate the models. The time dependent characteristic of design and recycling technology requires the adoption of dynamic modelling to predict recycling performance over time. The discussed dynamic and predictive framework provides a first principles basis for the calculation of the dispersion of harmful/valuable elements and environmental impact. This optimizes the spending of money on large scale trials and monitoring test to establish these results. At the same time legislation and policy on recyclability of products can be tested if it stands the test of time or if new designs comply with environmental legislation in the future. Prediction of recycling performance, recyclate quality and toxicity as a function of product design, shredding and (future) recycling system configurations will be demonstrated in various industrial examples, which includes an evaluation if shredding is advisable or not for precious and platinum group elements recovery during recycling. Also the so important balance between energy recovery and feedstock recycling is shown. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002295

Flows and fates of nickel–cadmium batteries in the City of Cape Town / Kyle Mason-Jones in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 211–218 Titre : Flows and fates of nickel–cadmium batteries in the City of Cape Town Type de document : texte imprimé Auteurs : Kyle Mason-Jones, Auteur ; Harro Von Blottnitz, Auteur Année de publication : 2011 Article en page(s) : pp. 211–218 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Environmental  Recycling Résumé : The use and disposal of nickel–cadmium secondary cells (the basic components of NiCd batteries) in Cape Town, South Africa, has been investigated with the objective of quantifying the associated flows of cadmium. Small sealed cells were found to make the dominant contribution to overall cadmium flows, with cordless power tools and separately imported cells accounting for most of these. Essentially all of these cells either have or will enter the general waste streams of the city. Large industrial cells made a smaller but significant contribution to overall flows, but none were known to have entered the general waste stream. These went primarily to hazardous waste disposal outside the city or recycling abroad, with some going into storage. The results suggested that the city’s landfill stocks of cadmium are considerable, and that these could continue to grow in the future. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002350 [article] Flows and fates of nickel–cadmium batteries in the City of Cape Town [texte imprimé] / Kyle Mason-Jones, Auteur ; Harro Von Blottnitz, Auteur . - 2011 . - pp. 211–218. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 211–218 Mots-clés : Environmental  Recycling Résumé : The use and disposal of nickel–cadmium secondary cells (the basic components of NiCd batteries) in Cape Town, South Africa, has been investigated with the objective of quantifying the associated flows of cadmium. Small sealed cells were found to make the dominant contribution to overall cadmium flows, with cordless power tools and separately imported cells accounting for most of these. Essentially all of these cells either have or will enter the general waste streams of the city. Large industrial cells made a smaller but significant contribution to overall flows, but none were known to have entered the general waste stream. These went primarily to hazardous waste disposal outside the city or recycling abroad, with some going into storage. The results suggested that the city’s landfill stocks of cadmium are considerable, and that these could continue to grow in the future. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002350

Biological treatment of wastewater produced during recycling of spent lithium primary battery / Kyoungkeun Yoo in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 219–224 Titre : Biological treatment of wastewater produced during recycling of spent lithium primary battery Type de document : texte imprimé Auteurs : Kyoungkeun Yoo, Auteur ; Shun-Myung Shin, Auteur ; Dong-Hyo Yang, Auteur Année de publication : 2011 Article en page(s) : pp. 219–224 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Biological  treatment  Metal  wastewater  Acidithiobacillus  ferrooxidans  Battery  recycling Résumé : Wastewater produced during recycling of spent lithium primary battery was biologically treated with Acidithiobacillus ferrooxidans to decrease the pH and metal concentration. Since the wastewater contains high concentrations of Cr, Ni, and Li, the effects of these metals on the bacterial activity in a 9 K medium were also investigated. Samples of the medium with different metal concentrations were treated, and the oxidation ratio of Fe2+ ions was measured to examine the activity of bacteria. In the treatment of simulated wastewater, the presence of Cr and Ni ions with concentrations of 8000 g m−3 and 13,000 g m−3, respectively, did not inhibit the bacterial activity, whereas the oxidation ratio of Fe2+ ions was observed to be low in the medium when Li ion was present with a concentration at 5000 g m−3. This observation suggested that at this concentration, Li ion suppressed the bacterial activity. In the case of treatment of real wastewater containing Cr, Ni, and Li, the oxidation ratio of Fe2+ to Fe3+ was observed to be low while the Fe concentration and pH decreased to 21,633 g m−3 and 1.8, respectively. Thus, the wastewater produced during the recycling of spent lithium primary batteries can be effectively treated biologically for re-circulating in the recycling process. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002891 [article] Biological treatment of wastewater produced during recycling of spent lithium primary battery [texte imprimé] / Kyoungkeun Yoo, Auteur ; Shun-Myung Shin, Auteur ; Dong-Hyo Yang, Auteur . - 2011 . - pp. 219–224. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 219–224 Mots-clés : Biological  treatment  Metal  wastewater  Acidithiobacillus  ferrooxidans  Battery  recycling Résumé : Wastewater produced during recycling of spent lithium primary battery was biologically treated with Acidithiobacillus ferrooxidans to decrease the pH and metal concentration. Since the wastewater contains high concentrations of Cr, Ni, and Li, the effects of these metals on the bacterial activity in a 9 K medium were also investigated. Samples of the medium with different metal concentrations were treated, and the oxidation ratio of Fe2+ ions was measured to examine the activity of bacteria. In the treatment of simulated wastewater, the presence of Cr and Ni ions with concentrations of 8000 g m−3 and 13,000 g m−3, respectively, did not inhibit the bacterial activity, whereas the oxidation ratio of Fe2+ ions was observed to be low in the medium when Li ion was present with a concentration at 5000 g m−3. This observation suggested that at this concentration, Li ion suppressed the bacterial activity. In the case of treatment of real wastewater containing Cr, Ni, and Li, the oxidation ratio of Fe2+ to Fe3+ was observed to be low while the Fe concentration and pH decreased to 21,633 g m−3 and 1.8, respectively. Thus, the wastewater produced during the recycling of spent lithium primary batteries can be effectively treated biologically for re-circulating in the recycling process. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002891

Mitigating the generation of acid mine drainage from copper sulfide tailings impoundments in perpetuity / A.H. Hesketh in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 225–229 Titre : Mitigating the generation of acid mine drainage from copper sulfide tailings impoundments in perpetuity : A case study for an integrated management strategy Type de document : texte imprimé Auteurs : A.H. Hesketh, Auteur ; J. L. Broadhurst, Auteur ; S.T.L. Harrison, Auteur Année de publication : 2011 Article en page(s) : pp. 225–229 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Acid  mine  drainage  Sulfide  ores  Froth  flotation  Tailings  disposal  Waste  processing Résumé : Acid mine drainage (AMD) is one of the most serious and pervasive challenges facing the minerals industry. Current philosophy in sulfide tailings management takes an end-of-pipe approach which is yet to be shown to be sufficient to prevent post-closure impacts from AMD and guarantee “walk-away” status. An improved, integrated approach to tailings management and AMD mitigation is proposed, whereby conventional tailings are separated with the use of flotation into a largely benign tailings stream and a sulfide-rich product. The key features of this conceptual approach are outlined and partly demonstrated for the case of porphyry-type copper sulfide tailings. The significance of this approach is that it provides a basis for the identification of opportunities for the development of new process designs incorporating waste management systems for mitigating AMD in a manner consistent with the principles of cleaner production and sustainable development. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002453 [article] Mitigating the generation of acid mine drainage from copper sulfide tailings impoundments in perpetuity : A case study for an integrated management strategy [texte imprimé] / A.H. Hesketh, Auteur ; J. L. Broadhurst, Auteur ; S.T.L. Harrison, Auteur . - 2011 . - pp. 225–229. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 225–229 Mots-clés : Acid  mine  drainage  Sulfide  ores  Froth  flotation  Tailings  disposal  Waste  processing Résumé : Acid mine drainage (AMD) is one of the most serious and pervasive challenges facing the minerals industry. Current philosophy in sulfide tailings management takes an end-of-pipe approach which is yet to be shown to be sufficient to prevent post-closure impacts from AMD and guarantee “walk-away” status. An improved, integrated approach to tailings management and AMD mitigation is proposed, whereby conventional tailings are separated with the use of flotation into a largely benign tailings stream and a sulfide-rich product. The key features of this conceptual approach are outlined and partly demonstrated for the case of porphyry-type copper sulfide tailings. The significance of this approach is that it provides a basis for the identification of opportunities for the development of new process designs incorporating waste management systems for mitigating AMD in a manner consistent with the principles of cleaner production and sustainable development. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002453

Incorporation of arsenic during the formation of Mg-bearing minerals at alkaline condition / E.M. Opiso in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 230–237 Titre : Incorporation of arsenic during the formation of Mg-bearing minerals at alkaline condition Type de document : texte imprimé Auteurs : E.M. Opiso, Auteur ; T. Sato, Auteur ; K. Morimoto, Auteur Année de publication : 2011 Article en page(s) : pp. 230–237 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Arsenic  Incorporation  Alkaline  wastes  Mg-bearing  minerals Résumé : The release of toxic anions during the chemical weathering of alkaline wastes such as blast furnace slag and coal fly ash presents a serious problem to public health and the environment. This study investigated arsenate sorption behavior onto Mg-bearing minerals formed in the Mg–Si–Al system at alkaline pH conditions in order to understand the safe removal and encapsulation of arsenate by Mg-bearing minerals under such conditions. Sorption experiments were performed during and after mineral formation and leaching tests using phosphate bearing solution were conducted to understand arsenic association with the minerals. The results revealed that brucite (Mg(OH)2), hydrotalcite (Mg6Al2(CO3)(OH)16·4(H2O)) and serpentine (MgSi2O5(OH)4) have high uptake capacity for arsenate. However, arsenic incorporation was only observed during the formation of high Al content hydrotalcite and serpentine minerals and was greatly enhanced at higher temperature. This implies that by controlling pore water chemistry of alkaline wastes with high reactivity, the irreversible fixation of arsenic by Mg-bearing minerals in alkaline conditions can be expected. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001939 [article] Incorporation of arsenic during the formation of Mg-bearing minerals at alkaline condition [texte imprimé] / E.M. Opiso, Auteur ; T. Sato, Auteur ; K. Morimoto, Auteur . - 2011 . - pp. 230–237. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 230–237 Mots-clés : Arsenic  Incorporation  Alkaline  wastes  Mg-bearing  minerals Résumé : The release of toxic anions during the chemical weathering of alkaline wastes such as blast furnace slag and coal fly ash presents a serious problem to public health and the environment. This study investigated arsenate sorption behavior onto Mg-bearing minerals formed in the Mg–Si–Al system at alkaline pH conditions in order to understand the safe removal and encapsulation of arsenate by Mg-bearing minerals under such conditions. Sorption experiments were performed during and after mineral formation and leaching tests using phosphate bearing solution were conducted to understand arsenic association with the minerals. The results revealed that brucite (Mg(OH)2), hydrotalcite (Mg6Al2(CO3)(OH)16·4(H2O)) and serpentine (MgSi2O5(OH)4) have high uptake capacity for arsenate. However, arsenic incorporation was only observed during the formation of high Al content hydrotalcite and serpentine minerals and was greatly enhanced at higher temperature. This implies that by controlling pore water chemistry of alkaline wastes with high reactivity, the irreversible fixation of arsenic by Mg-bearing minerals in alkaline conditions can be expected. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509001939

Factors affecting arsenic mobility from hydrothermally altered rock in impoundment-type in situ experiments / Carlito B. Tabelin in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 238–248 Titre : Factors affecting arsenic mobility from hydrothermally altered rock in impoundment-type in situ experiments Type de document : texte imprimé Auteurs : Carlito B. Tabelin, Auteur ; Toshifumi Igarashi, Auteur ; Shuichi Tamoto, Auteur Année de publication : 2011 Article en page(s) : pp. 238–248 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Leaching  Oxidation  Redox  reactions Résumé : This paper describes the factors affecting arsenic (As) mobility from hydrothermally altered rock under in situ conditions. Four impoundments were built on site with rectangular base, truncated-pyramid structures. Impoundment 1 was composed solely of the hydrothermally altered rock while impoundments 2–4 were covered with different types of silty covering soil in order to minimize O2 and water intrusion into the rock. The results indicate that seasonal variations in temperature, O2 concentration and volumetric water content in the impoundments strongly influenced As leaching. When the temperature was high and the water content low, oxidation of sulfide minerals in the rock was enhanced because of a higher air–water–rock interaction. Concentration of As in the porewater increased when it rained after a specific period of dry weather. The use of a silty covering soil influenced the concentrations of As and View the MathML source in the porewater although it did not affect the pH and Eh significantly. In this case, O2 and water movement might be the rate controlling step of As leaching, that is, if there is no covering soil on the impoundment, more As will leach out from the rock. The use of a silty covering soil showed promise of reducing As leaching from the waste rock, but utilizing it alone was insufficient to effectively prevent As release from the rock. A combination of covering soil and bottom As-adsorption layer to incorporate any As released from the rock is therefore recommended. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002441 [article] Factors affecting arsenic mobility from hydrothermally altered rock in impoundment-type in situ experiments [texte imprimé] / Carlito B. Tabelin, Auteur ; Toshifumi Igarashi, Auteur ; Shuichi Tamoto, Auteur . - 2011 . - pp. 238–248. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 238–248 Mots-clés : Leaching  Oxidation  Redox  reactions Résumé : This paper describes the factors affecting arsenic (As) mobility from hydrothermally altered rock under in situ conditions. Four impoundments were built on site with rectangular base, truncated-pyramid structures. Impoundment 1 was composed solely of the hydrothermally altered rock while impoundments 2–4 were covered with different types of silty covering soil in order to minimize O2 and water intrusion into the rock. The results indicate that seasonal variations in temperature, O2 concentration and volumetric water content in the impoundments strongly influenced As leaching. When the temperature was high and the water content low, oxidation of sulfide minerals in the rock was enhanced because of a higher air–water–rock interaction. Concentration of As in the porewater increased when it rained after a specific period of dry weather. The use of a silty covering soil influenced the concentrations of As and View the MathML source in the porewater although it did not affect the pH and Eh significantly. In this case, O2 and water movement might be the rate controlling step of As leaching, that is, if there is no covering soil on the impoundment, more As will leach out from the rock. The use of a silty covering soil showed promise of reducing As leaching from the waste rock, but utilizing it alone was insufficient to effectively prevent As release from the rock. A combination of covering soil and bottom As-adsorption layer to incorporate any As released from the rock is therefore recommended. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002441

Production of a poly-alumino-iron sulphate coagulant by chemical precipitation of a coal mining acid drainage / J.C.S.S. Menezes in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 249–251 Titre : Production of a poly-alumino-iron sulphate coagulant by chemical precipitation of a coal mining acid drainage Type de document : texte imprimé Auteurs : J.C.S.S. Menezes, Auteur ; R.A. Silva, Auteur ; I. S. Arce, Auteur Année de publication : 2011 Article en page(s) : pp. 249–251 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Acid  rock  drainage  pH  control  Environmental  Recycling Résumé : The aim of this work was to produce a poly-alumino-iron sulphate coagulant from acidic coal mine drainage. Precipitating the iron and aluminium at pH 5.0, followed by dissolution in sulphuric acid, produced a coagulant consisting of 8.7% iron and 3.3% aluminium. Water treatment tests proved that this coagulant was as efficient as the coagulant chemicals conventionally used in water treatment plants. The process can be easily incorporated into conventional AMD treatment plants, thereby reducing sludge waste issues and producing a valuable chemical reagent. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002866 [article] Production of a poly-alumino-iron sulphate coagulant by chemical precipitation of a coal mining acid drainage [texte imprimé] / J.C.S.S. Menezes, Auteur ; R.A. Silva, Auteur ; I. S. Arce, Auteur . - 2011 . - pp. 249–251. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 249–251 Mots-clés : Acid  rock  drainage  pH  control  Environmental  Recycling Résumé : The aim of this work was to produce a poly-alumino-iron sulphate coagulant from acidic coal mine drainage. Precipitating the iron and aluminium at pH 5.0, followed by dissolution in sulphuric acid, produced a coagulant consisting of 8.7% iron and 3.3% aluminium. Water treatment tests proved that this coagulant was as efficient as the coagulant chemicals conventionally used in water treatment plants. The process can be easily incorporated into conventional AMD treatment plants, thereby reducing sludge waste issues and producing a valuable chemical reagent. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002866

Application of coal fly ash to circumneutral mine waters for the removal of sulphates as gypsum and ettringite / Godfrey Madzivire in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 252–257 Titre : Application of coal fly ash to circumneutral mine waters for the removal of sulphates as gypsum and ettringite Type de document : texte imprimé Auteurs : Godfrey Madzivire, Auteur ; Leslie F. Petrik, Auteur ; Wilson M. Gitari, Auteur Année de publication : 2011 Article en page(s) : pp. 252–257 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Fly  ash  Acid  mine  drainage  Circumneutral  mine  water  Sulphates  Neutralization Résumé : South African power stations generate large amounts of highly alkaline fly ash (FA). This waste product has a serious impact on the environment. Acid mine drainage (AMD) is another environmental problem associated with mining. AMD has high heavy metal content in addition to high sulphate concentrations. Several studies have shown that 80–90% of sulphates can be removed when FA is co-disposed with AMD rich in Fe and Al. In South Africa, sources of contaminated mine waters, unlike AMD have circumneutral pH and much lower concentrations of Fe and Al, but rich in Ca and Mg. Treatment of such waters with FA resulted in no significant removal of sulphates when treated to pH less than 10. Subsequent treatment of circumneutral mine water to pH greater than 11 resulted in more than 60% sulphate removal. Treatment of circumneutral mine water to pH greater than 11 with FA followed by seeding with gypsum crystals and the addition of amorphous Al(OH)3 resulted in removal of sulphate to levels below the Department of Water Affairs and Forestry (DWAF) water quality effluent limit (500 ppm). DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900301X [article] Application of coal fly ash to circumneutral mine waters for the removal of sulphates as gypsum and ettringite [texte imprimé] / Godfrey Madzivire, Auteur ; Leslie F. Petrik, Auteur ; Wilson M. Gitari, Auteur . - 2011 . - pp. 252–257. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 252–257 Mots-clés : Fly  ash  Acid  mine  drainage  Circumneutral  mine  water  Sulphates  Neutralization Résumé : South African power stations generate large amounts of highly alkaline fly ash (FA). This waste product has a serious impact on the environment. Acid mine drainage (AMD) is another environmental problem associated with mining. AMD has high heavy metal content in addition to high sulphate concentrations. Several studies have shown that 80–90% of sulphates can be removed when FA is co-disposed with AMD rich in Fe and Al. In South Africa, sources of contaminated mine waters, unlike AMD have circumneutral pH and much lower concentrations of Fe and Al, but rich in Ca and Mg. Treatment of such waters with FA resulted in no significant removal of sulphates when treated to pH less than 10. Subsequent treatment of circumneutral mine water to pH greater than 11 resulted in more than 60% sulphate removal. Treatment of circumneutral mine water to pH greater than 11 with FA followed by seeding with gypsum crystals and the addition of amorphous Al(OH)3 resulted in removal of sulphate to levels below the Department of Water Affairs and Forestry (DWAF) water quality effluent limit (500 ppm). DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268750900301X

Chemical and mineralogical characterization of a South African bituminous coal and its ash, and effect on pH of ash transport water / L.J. Moitsheki in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 258–261 Titre : Chemical and mineralogical characterization of a South African bituminous coal and its ash, and effect on pH of ash transport water Type de document : texte imprimé Auteurs : L.J. Moitsheki, Auteur ; R.H. Matjie, Auteur ; A. Baran, Auteur Année de publication : 2011 Article en page(s) : pp. 258–261 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Mineralogy  Leaching  Ash  transport  water Résumé : Sasol utilizes a low-rank bituminous coal for steam and synthetic gas production. The ash produced is transported by water for further processing. Understanding the chemistry of coal and the resulting ash properties would allow a better understanding of the origin of high pH of water used during ash handling or transport. A main objective of this study was to identify the species responsible for high pH values of the ash transport water, when burning coal from the Sasolburg Mooikraal mine. The coal contained proportions of extraneous carbonates, i.e. CaMg(CO3)2 and CaCO3, that decompose at elevated temperatures to form CaO and MgO. The ash samples in this work contained free CaO, as verified by X-ray diffraction and ethylene glycol leaching. ICP-OES analysis of water leachates of the ash showed calcium dissolution into the water. The high pH values of the leachates were consistent with the expected pH of a saturated water solution of calcium hydroxide. Contact of the ash with water produced Ca(OH)2. For combustion of this coal, the high pH of the water used for ash transport can be attributed to the free CaO in the ash. The methodological approach to this study could be directly applicable to other coals and their ashes, even of different composition than the specific coal and ash used in this study. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002970 [article] Chemical and mineralogical characterization of a South African bituminous coal and its ash, and effect on pH of ash transport water [texte imprimé] / L.J. Moitsheki, Auteur ; R.H. Matjie, Auteur ; A. Baran, Auteur . - 2011 . - pp. 258–261. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 258–261 Mots-clés : Mineralogy  Leaching  Ash  transport  water Résumé : Sasol utilizes a low-rank bituminous coal for steam and synthetic gas production. The ash produced is transported by water for further processing. Understanding the chemistry of coal and the resulting ash properties would allow a better understanding of the origin of high pH of water used during ash handling or transport. A main objective of this study was to identify the species responsible for high pH values of the ash transport water, when burning coal from the Sasolburg Mooikraal mine. The coal contained proportions of extraneous carbonates, i.e. CaMg(CO3)2 and CaCO3, that decompose at elevated temperatures to form CaO and MgO. The ash samples in this work contained free CaO, as verified by X-ray diffraction and ethylene glycol leaching. ICP-OES analysis of water leachates of the ash showed calcium dissolution into the water. The high pH values of the leachates were consistent with the expected pH of a saturated water solution of calcium hydroxide. Contact of the ash with water produced Ca(OH)2. For combustion of this coal, the high pH of the water used for ash transport can be attributed to the free CaO in the ash. The methodological approach to this study could be directly applicable to other coals and their ashes, even of different composition than the specific coal and ash used in this study. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002970

Effective CO2-specific sequestration capacity of steel slags and variability in their leaching behaviour in view of industrial mineral carbonation / Frédéric J. Doucet in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 262–269 Titre : Effective CO2-specific sequestration capacity of steel slags and variability in their leaching behaviour in view of industrial mineral carbonation Type de document : texte imprimé Auteurs : Frédéric J. Doucet, Auteur Année de publication : 2011 Article en page(s) : pp. 262–269 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Waste  processing  Leaching Résumé : Industrial mineral carbonation of alkaline wastes, an increasingly promising component of carbon capture and storage, may play an important role as a CO2 mitigation strategy in the context of climate change. Steelmaking slags are of particular interest owing to their high content of calcium. The cumulated ‘effective’ CO2-specific sequestration capacity (calculated on the basis of calcium and magnesium extracted to a 0.5 M HNO3 solution) of three basic oxygen and one electric arc furnace slags generated at steel mills in South Africa was 253 kt CO2 per annum, which was 25.2% lower than their cumulated ‘theoretical’ capacity (estimated on the basis of total calcium and magnesium content in slags). The mineralogical composition and solubility characteristics of slags conferred very distinct leaching behaviours to the slags, including differences in: (i) the amount of heat generated during their dissolution, (ii) their buffering capacity, (iii) the rate and extent of calcium and magnesium extraction from the slags, and (iv) the mineralogical composition of the non-dissolved residues. These findings suggest that separate leaching processes may need to be developed for slags with largely distinct mineralogical compositions and structural features. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002313 [article] Effective CO2-specific sequestration capacity of steel slags and variability in their leaching behaviour in view of industrial mineral carbonation [texte imprimé] / Frédéric J. Doucet, Auteur . - 2011 . - pp. 262–269. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 262–269 Mots-clés : Waste  processing  Leaching Résumé : Industrial mineral carbonation of alkaline wastes, an increasingly promising component of carbon capture and storage, may play an important role as a CO2 mitigation strategy in the context of climate change. Steelmaking slags are of particular interest owing to their high content of calcium. The cumulated ‘effective’ CO2-specific sequestration capacity (calculated on the basis of calcium and magnesium extracted to a 0.5 M HNO3 solution) of three basic oxygen and one electric arc furnace slags generated at steel mills in South Africa was 253 kt CO2 per annum, which was 25.2% lower than their cumulated ‘theoretical’ capacity (estimated on the basis of total calcium and magnesium content in slags). The mineralogical composition and solubility characteristics of slags conferred very distinct leaching behaviours to the slags, including differences in: (i) the amount of heat generated during their dissolution, (ii) their buffering capacity, (iii) the rate and extent of calcium and magnesium extraction from the slags, and (iv) the mineralogical composition of the non-dissolved residues. These findings suggest that separate leaching processes may need to be developed for slags with largely distinct mineralogical compositions and structural features. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002313

Removal of hexavalent chromium from water by adsorption onto surfactant modified montmorillonite / Mariana Coutinho Brum in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 270–272 Titre : Removal of hexavalent chromium from water by adsorption onto surfactant modified montmorillonite Type de document : texte imprimé Auteurs : Mariana Coutinho Brum, Auteur ; Jefferson Leixas Capitaneo, Auteur ; José Farias Oliveira, Auteur Année de publication : 2011 Article en page(s) : pp. 270–272 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Environmental  Pollution  Surface  modification Résumé : The utilization of organoclays as adsorbents in the remediation of polluted water has been the subject of many recent research studies. In the present work, the adsorption of hexavalent chromium onto montmorillonite modified by the cationic surfactant cetylpyridinium bromide (CPB) was studied by aiming at water pollution remediation. The electrophoretic mobility measurements of the organo-montmorillonite showed a zeta potential reversion from negative to positive in the whole acidic pH range and up to pH 8.5. In some cases the adsorption of chromate ions onto the organo-montmorillonite was higher than 98% and was well described by the Langmuir adsorption isotherm. The utilization of montmorillonite modified by CPB showed to be an attractive solution to the remediation of water contaminated with chromate ions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002623 [article] Removal of hexavalent chromium from water by adsorption onto surfactant modified montmorillonite [texte imprimé] / Mariana Coutinho Brum, Auteur ; Jefferson Leixas Capitaneo, Auteur ; José Farias Oliveira, Auteur . - 2011 . - pp. 270–272. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 270–272 Mots-clés : Environmental  Pollution  Surface  modification Résumé : The utilization of organoclays as adsorbents in the remediation of polluted water has been the subject of many recent research studies. In the present work, the adsorption of hexavalent chromium onto montmorillonite modified by the cationic surfactant cetylpyridinium bromide (CPB) was studied by aiming at water pollution remediation. The electrophoretic mobility measurements of the organo-montmorillonite showed a zeta potential reversion from negative to positive in the whole acidic pH range and up to pH 8.5. In some cases the adsorption of chromate ions onto the organo-montmorillonite was higher than 98% and was well described by the Langmuir adsorption isotherm. The utilization of montmorillonite modified by CPB showed to be an attractive solution to the remediation of water contaminated with chromate ions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002623

Characterization, microstructure and corrosion behavior of magnesia refractories produced from recycled refractory aggregates / Farzin Arianpour in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 273–276 Titre : Characterization, microstructure and corrosion behavior of magnesia refractories produced from recycled refractory aggregates Type de document : texte imprimé Auteurs : Farzin Arianpour, Auteur ; Faramarz Kazemi, Auteur ; Farhad Golestani Fard, Auteur Année de publication : 2011 Article en page(s) : pp. 273–276 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Industrial  minerals  Crushing  Particle  size  Environmental  Recycling Résumé : This paper aims to report the results of some investigations carried out in Iranian steel industries to reuse the spent magnesia graphite refractory bricks in the forms of the new shaped and unshaped magnesia refractories. Economical aspects of recycling and minimizing the environmental effects of spent refractories landfills were the basic goals of this research. The spent MgO–C refractory bricks from electric arc (EAF) and ladle (LF) furnaces were analyzed in terms of microstructural and chemical properties. Different samples were prepared from natural sintered magnesia and 10–30 wt.% of recycled aggregates in the forms of magnesia refractory brick and ramming mix and their physical and mechanical properties were evaluated. Also the slag corrosion behavior and microstructural properties of corroded samples were investigated. The results showed that the addition of up to 30 wt.% of recycled aggregates had no negative effects on the properties of magnesia refractories. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002799 [article] Characterization, microstructure and corrosion behavior of magnesia refractories produced from recycled refractory aggregates [texte imprimé] / Farzin Arianpour, Auteur ; Faramarz Kazemi, Auteur ; Farhad Golestani Fard, Auteur . - 2011 . - pp. 273–276. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 273–276 Mots-clés : Industrial  minerals  Crushing  Particle  size  Environmental  Recycling Résumé : This paper aims to report the results of some investigations carried out in Iranian steel industries to reuse the spent magnesia graphite refractory bricks in the forms of the new shaped and unshaped magnesia refractories. Economical aspects of recycling and minimizing the environmental effects of spent refractories landfills were the basic goals of this research. The spent MgO–C refractory bricks from electric arc (EAF) and ladle (LF) furnaces were analyzed in terms of microstructural and chemical properties. Different samples were prepared from natural sintered magnesia and 10–30 wt.% of recycled aggregates in the forms of magnesia refractory brick and ramming mix and their physical and mechanical properties were evaluated. Also the slag corrosion behavior and microstructural properties of corroded samples were investigated. The results showed that the addition of up to 30 wt.% of recycled aggregates had no negative effects on the properties of magnesia refractories. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002799

Study of the recovery of rare earth elements from computer monitor scraps / Luciene V. Resende in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 277–280 Titre : Study of the recovery of rare earth elements from computer monitor scraps : Leaching experiments Type de document : texte imprimé Auteurs : Luciene V. Resende, Auteur ; Carlos A. Morais, Auteur Année de publication : 2011 Article en page(s) : pp. 277–280 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Extractive  metallurgy  Hydrometallurgy  Leaching  Environmental Résumé : This paper describes the study of the coating powder leaching from computer monitors scraps with the view to obtain a liquor which can be treated by hydrometallurgical techniques to purify the metals studied. The technological development observed in recent years has stimulated the application of rare earth (RE) elements. TV tubes and computer monitors present as coating a powder containing some rare earth elements, mainly europium and yttrium. The recovery of the RE elements from electronics scraps is extremely important as the economic and environmental issues are concerned. The results of this study indicated the technical viability of the recovery of the metals. After the leaching process optimization, the europium and yttrium recovery was over 97% and a liquor containing 16.5 g/L Y, 0.55 g/L Eu, 59.0 g/L Zn, 0.20 g/L Fe, 131 g/L View the MathML source, 0.20 g/L Ca and 2.50 g/L Al was obtained. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003215 [article] Study of the recovery of rare earth elements from computer monitor scraps : Leaching experiments [texte imprimé] / Luciene V. Resende, Auteur ; Carlos A. Morais, Auteur . - 2011 . - pp. 277–280. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 277–280 Mots-clés : Extractive  metallurgy  Hydrometallurgy  Leaching  Environmental Résumé : This paper describes the study of the coating powder leaching from computer monitors scraps with the view to obtain a liquor which can be treated by hydrometallurgical techniques to purify the metals studied. The technological development observed in recent years has stimulated the application of rare earth (RE) elements. TV tubes and computer monitors present as coating a powder containing some rare earth elements, mainly europium and yttrium. The recovery of the RE elements from electronics scraps is extremely important as the economic and environmental issues are concerned. The results of this study indicated the technical viability of the recovery of the metals. After the leaching process optimization, the europium and yttrium recovery was over 97% and a liquor containing 16.5 g/L Y, 0.55 g/L Eu, 59.0 g/L Zn, 0.20 g/L Fe, 131 g/L View the MathML source, 0.20 g/L Ca and 2.50 g/L Al was obtained. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509003215

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