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dc.contributor.authorJha, A.
dc.contributor.authorTang, S.
dc.contributor.authorChrysanthou, A.
dc.date.accessioned2012-11-22T13:00:04Z
dc.date.available2012-11-22T13:00:04Z
dc.date.issued1996
dc.identifier.citationJha , A , Tang , S & Chrysanthou , A 1996 , ' Phase equilibria in the metal-sulfur-oxygen system and selective reduction of metal oxides and sulfides : Part I. The carbothermic reduction and calcination of complex mineral sulfides ' , Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science , vol. 27 , no. 5 , pp. 829-840 .
dc.identifier.issn1073-5615
dc.identifier.otherPURE: 1055332
dc.identifier.otherPURE UUID: 75deaf08-c388-4581-b031-659f388fd63f
dc.identifier.otherScopus: 0030263264
dc.identifier.urihttp://hdl.handle.net/2299/9220
dc.descriptionCopyright 2006 Elsevier B.V., All rights reserved.
dc.description.abstractThe difference in the standard Gibbs free energy for the formation of any two oxides or sulfides is the chemical potential for selective reduction of metals from complex minerals. The magnitude of the Gibbs free energy difference is shown by plotting the univariant relationships for relevant sulfides and oxides. In this investigation, three examples of mineral sulfides are considered, and the experimental results are compared with the predicted thermodynamic calculations. These examples include the reduction conditions for nickel and iron sulfides and pentlandite (Fe,Ni)S and chalcopyrite (CuFeS) minerals. The reduction behavior of mineral sulfides, such as those of nickel, cobalt, iron, and copper, is illustrated by referring to both the sulfide and alloy phase equilibria. In particular, the solution thermodynamic properties of the metallic phase equilibria are featured for determining the physical chemistry of preferential or selective reduction of the metal oxides and sulfides. The mechanism for the reduction of the aforementioned sulfide minerals is explained with the aid of the governing phase equilibria for the calcination process. The results from the carbothermic reduction of sulfide minerals are also compared. The important roles of lime and calcium sulfate in controlling the emission of sulfurous gases during the reduction reaction are explained. A qualitative analysis of reduction reactions of nickel and iron sulfides is reviewed to provide a comparison of the mechanism for complex nickel-bearing minerals. The importance of these results in producing alloy and pure metallic phases is also examined.en
dc.format.extent12
dc.language.isoeng
dc.relation.ispartofMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
dc.rights/dk/atira/pure/core/openaccesspermission/open
dc.titlePhase equilibria in the metal-sulfur-oxygen system and selective reduction of metal oxides and sulfides : Part I. The carbothermic reduction and calcination of complex mineral sulfidesen
dc.contributor.institutionCentre for Engineering Research
dc.contributor.institutionSchool of Engineering and Technology
dc.contributor.institutionScience & Technology Research Institute
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=0030263264&partnerID=8YFLogxK
dc.relation.schoolSchool of Engineering and Technology
dc.description.versiontypeFinal Published version
rioxxterms.versionVoR
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeopenAccess


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