Sustainable and efficient leaching of tungsten in ammoniacal ammonium carbonate solution from the sulfuric acid converted product of scheelite

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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 2018-10-16T08:54:21Z
dc.date.available 2018-10-16T08:54:21Z
dc.date.issued 2018-10-01
dc.identifier.citation Shen , L , Li , X , Zhou , Q , Peng , Z , Liu , G , Qi , T & Taskinen , P 2018 , ' Sustainable and efficient leaching of tungsten in ammoniacal ammonium carbonate solution from the sulfuric acid converted product of scheelite ' JOURNAL OF CLEANER PRODUCTION , vol 197 , pp. 690-698 . DOI: 10.1016/j.jclepro.2018.06.256 en
dc.identifier.issn 0959-6526
dc.identifier.issn 1879-1786
dc.identifier.other PURE UUID: 51d5ae1d-aeeb-438d-ae8f-607203fdcefd
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/sustainable-and-efficient-leaching-of-tungsten-in-ammoniacal-ammonium-carbonate-solution-from-the-sulfuric-acid-converted-product-of-scheelite(51d5ae1d-aeeb-438d-ae8f-607203fdcefd).html
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85049895388&partnerID=8YFLogxK
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/34275
dc.description.abstract To directly obtain solution of (NH4)2WO4 instead of Na2WO4 is the key for developing a cleaner technology of ammonium paratungstate production. In this paper, ammoniacal ammonium carbonate solution was adopted for leaching tungsten from the converted product, a mixture of H2WO4 and CaSO4 obtained by treating scheelite with sulfuric acid. The research indicates that tungsten can be efficiently extracted in form of ammonium tungstate solution with WO3 leaching yield of >99.5% under moderate leaching conditions. The WO3 leaching yield is influenced by the transformation of calcium sulfate to calcium carbonate due to forming CaWO4 through the secondary reaction between CaSO4 and (NH4)2WO4, whereas an excess (NH4)2CO3 (≥0.64 mol/L) can suppress the secondary reaction by facilitating the transformation. Additionally, the consumed ammonium carbonate can be recovered by treating the leaching residue with ammonium sulfate solution at above 70 °C. This work presents a cleaner and sustainable technique for producing ammonium paratungstate, with circulating the leaching reagents and bypassing the conversion of Na2WO4 to (NH4)2WO4. en
dc.format.extent 9
dc.format.extent 690-698
dc.language.iso en en
dc.relation.ispartofseries JOURNAL OF CLEANER PRODUCTION en
dc.relation.ispartofseries Volume 197 en
dc.rights embargoedAccess en
dc.subject.other Renewable Energy, Sustainability and the Environment en
dc.subject.other Environmental Science(all) en
dc.subject.other Strategy and Management en
dc.subject.other Industrial and Manufacturing Engineering en
dc.subject.other 215 Chemical engineering en
dc.title Sustainable and efficient leaching of tungsten in ammoniacal ammonium carbonate solution from the sulfuric acid converted product of scheelite 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 Ammonium paratungstate
dc.subject.keyword Calcium carbonate
dc.subject.keyword Calcium sulfate
dc.subject.keyword Leaching mechanism
dc.subject.keyword Tungstic acid
dc.subject.keyword Renewable Energy, Sustainability and the Environment
dc.subject.keyword Environmental Science(all)
dc.subject.keyword Strategy and Management
dc.subject.keyword Industrial and Manufacturing Engineering
dc.subject.keyword 215 Chemical engineering
dc.identifier.urn URN:NBN:fi:aalto-201810165352
dc.identifier.doi 10.1016/j.jclepro.2018.06.256
dc.date.embargo info:eu-repo/date/embargoEnd/2020-06-29


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