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dc.contributor.authorMohamed, Sameera
dc.contributor.authorDoucet, Frédéric J.
dc.contributor.authorVan der Merwe, Elizabet M.
dc.contributor.authorAltermann, Wladyslaw
dc.date.accessioned2017-04-12T07:33:38Z
dc.date.available2017-04-12T07:33:38Z
dc.date.issued2016
dc.identifier.citationMohamed, S. et al. 2016. Process development for elemental recovery from PGM tailings by thermochemical treatment: preliminary major element extraction studies using ammonium sulphate as extracting agent. Waste management, 50:334-345. [https://doi.org/10.1016/j.wasman.2016.02.021]en_US
dc.identifier.issn0956-053X
dc.identifier.urihttp://hdl.handle.net/10394/21341
dc.identifier.urihttps://doi.org/10.1016/j.wasman.2016.02.021
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0956053X1630068X
dc.description.abstractMine tailings can represent untapped secondary resources of non-ferrous, ferrous, precious, rare and trace metals. Continuous research is conducted to identify opportunities for the utilisation of these materials. This preliminary study investigated the possibility of extracting major elements from South African tailings associated with the mining of Platinum Group Metals (PGM) at the Two Rivers mine operations. These PGM tailings typically contain four major elements (11% Al2O3; 12% MgO; 22% Fe2O3; 34% Cr2O3), with lesser amounts of SiO2 (18%) and CaO (2%). Extraction was achieved via thermochemical treatment followed by aqueous dissolution, as an alternative to conventional hydrometallurgical processes. The thermochemical treatment step used ammonium sulphate, a widely available, low-cost, recyclable chemical agent. Quantification of the efficiency of the thermochemical process required the development and optimisation of the dissolution technique. Dissolution in water promoted the formation of secondary iron precipitates, which could be prevented by leaching thermochemically-treated tailings in 0.6M HNO3 solution. The best extraction efficiencies were achieved for aluminium (ca. 60%) and calcium (ca. 80%). 35% iron and 32% silicon were also extracted, alongside chromium (27%) and magnesium (25%). Thermochemical treatment using ammonium sulphate may therefore represent a promising technology for extracting valuable elements from PGM tailings, which could be subsequently converted to value-added products. However, it is not element-selective, and major elements were found to compete with the reagent to form water-soluble sulphate–metal species. Further development of this integrated process, which aims at achieving the full potential of utilisation of PGM tailings, is currently underwayen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.subjectPGM tailingsen_US
dc.subjectAmmonium sulphateen_US
dc.subjectMetal recovery and extractionen_US
dc.subjectThermochemical treatmenten_US
dc.subjectSolid-solid reactionen_US
dc.titleProcess development for elemental recovery from PGM tailings by thermochemical treatment: preliminary major element extraction studies using ammonium sulphate as extracting agenten_US
dc.typeArticleen_US
dc.contributor.researchID25405047 - Doucet, Frédéric Jules


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