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Chemical metathesis of chalcopyrite in acidic solutions

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dc.contributor.author Sequeira, CAC en
dc.contributor.author Santos, DMF en
dc.contributor.author Chen, Y en
dc.contributor.author Anastassakis, G en
dc.date.accessioned 2014-03-01T01:28:02Z
dc.date.available 2014-03-01T01:28:02Z
dc.date.issued 2008 en
dc.identifier.issn 0304-386X en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/18676
dc.subject Chalcopyrite en
dc.subject Chemical metathesis en
dc.subject Covellite en
dc.subject Digenite en
dc.subject.classification Metallurgy & Metallurgical Engineering en
dc.subject.other Annealing en
dc.subject.other Ball milling en
dc.subject.other Decomposition en
dc.subject.other Leaching en
dc.subject.other Reaction rates en
dc.subject.other Solutions en
dc.subject.other Chalcopyrite en
dc.subject.other Chemical metathesis en
dc.subject.other Covellite en
dc.subject.other Digenite en
dc.subject.other Copper compounds en
dc.title Chemical metathesis of chalcopyrite in acidic solutions en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.hydromet.2008.02.012 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.hydromet.2008.02.012 en
heal.language English en
heal.publicationDate 2008 en
heal.abstract The chemical metathesis of chalcopyrite in the presence of cupric ions was studied in sulphuric acid solutions. The effects of stirring, Cu(II) concentration, temperature and annealing were investigated by leaching and kinetic experiments. The primary reaction involved in the chemical metathesis leads to the formation of covellite, which is followed by an oxidation-reduction couple, with digenite production. This second step was found to be very slow requiring sub-sieve size particles for extensive reaction. The reaction was insensitive to the copper ion concentrations, and practically insensitive to stirring speed. The strain induced by stirred ball milling enhanced the reaction rate markedly due to the recrystallisation process which provides easy paths for diffusion along dislocation and grain boundaries. The kinetics were well correlated with a two-stage product layer diffusion model, with apparent activation energies less than 30 kJ mol(-1), and ferrous ion was found to be the rate determining diffusion species through the covellite phase (first stage) and covellite and digenite phase (second stage). (C) 2008 Elsevier B.V. All rights reserved. en
heal.publisher ELSEVIER SCIENCE BV en
heal.journalName Hydrometallurgy en
dc.identifier.doi 10.1016/j.hydromet.2008.02.012 en
dc.identifier.isi ISI:000256578900008 en
dc.identifier.volume 92 en
dc.identifier.issue 3-4 en
dc.identifier.spage 135 en
dc.identifier.epage 140 en


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