Wolframite Conversion in Treating a Mixed Wolframite–Scheelite Concentrate by Sulfuric Acid

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Shen, Leiting
dc.contributor.author Li, Xiaobin
dc.contributor.author Zhou, Qiusheng
dc.contributor.author Peng, Zhihong
dc.contributor.author Liu, Guihua
dc.contributor.author Qi, Tiangui
dc.contributor.author Taskinen, Pekka
dc.date.accessioned 2018-08-01T13:36:50Z
dc.date.available 2018-08-01T13:36:50Z
dc.date.issued 2018-02-01
dc.identifier.citation Shen , L , Li , X , Zhou , Q , Peng , Z , Liu , G , Qi , T & Taskinen , P 2018 , ' Wolframite Conversion in Treating a Mixed Wolframite–Scheelite Concentrate by Sulfuric Acid ' JOM , vol 70 , no. 2 , pp. 161-167 . DOI: 10.1007/s11837-017-2691-1 en
dc.identifier.issn 1047-4838
dc.identifier.issn 1543-1851
dc.identifier.other PURE UUID: efaa8ad7-2f65-431a-8574-909bc269a864
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/wolframite-conversion-in-treating-a-mixed-wolframitescheelite-concentrate-by-sulfuric-acid(efaa8ad7-2f65-431a-8574-909bc269a864).html
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85037066760&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/26200200/CHEM_Shen_et_al_Wolframite_Conversion_2018_JOM.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/32964
dc.description.abstract Complete wolframite conversion in sulfuric acid is significant for expanding the applicability of the sulfuric acid method for producing ammonium paratungstate. In this paper, the conversion of wolframite in treating a mixed wolframite–scheelite concentrate by sulfuric acid was studied systematically. The results show that the conversion of wolframite in sulfuric acid is more difficult than that of scheelite, requiring rigorous reaction conditions. A solid H2WO4 layer forms on the surfaces of the wolframite particles and becomes denser with increasing H2SO4 concentration, thus hindering the conversion. Furthermore, the difficulty in wolframite conversion can be mainly attributed to the accumulation of Fe2+ (and/or Mn2+) in the H2SO4 solution, which can be solved by reducing Fe2+ (and/or Mn2+) concentration through oxidization and/or a two-stage process. Additionally, the solid converted product of the mixed wolframite–scheelite concentrate has an excellent leachability of tungsten in an aqueous ammonium carbonate solution at ambient temperature, with approximately 99% WO3 recovery. This work presents a route for manufacturing ammonium paratungstate by treating the mixed concentrate in sulfuric acid followed by leaching in ammonium carbonate solution. en
dc.format.extent 7
dc.format.extent 161-167
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries JOM en
dc.relation.ispartofseries Volume 70, issue 2 en
dc.rights openAccess en
dc.subject.other Materials Science(all) en
dc.subject.other Engineering(all) en
dc.subject.other 215 Chemical engineering en
dc.subject.other 216 Materials engineering en
dc.title Wolframite Conversion in Treating a Mixed Wolframite–Scheelite Concentrate by Sulfuric Acid en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Chemical and Metallurgical Engineering
dc.contributor.department Central South University
dc.subject.keyword Materials Science(all)
dc.subject.keyword Engineering(all)
dc.subject.keyword 215 Chemical engineering
dc.subject.keyword 216 Materials engineering
dc.identifier.urn URN:NBN:fi:aalto-201808014365
dc.identifier.doi 10.1007/s11837-017-2691-1
dc.date.embargo info:eu-repo/date/embargoEnd/2019-02-02


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