Thiosulfate-copper-ammonia leaching of pure gold and pressure oxidized concentrate

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Porvali, Antti Rintala, Lotta Aromaa, Jari Kaartinen, Tommi Forsen, Olof Lundstrom, Mari 2017-06-20T11:19:50Z 2017-06-20T11:19:50Z 2017
dc.identifier.citation Porvali , A , Rintala , L , Aromaa , J , Kaartinen , T , Forsen , O & Lundstrom , M 2017 , ' Thiosulfate-copper-ammonia leaching of pure gold and pressure oxidized concentrate ' Physicochemical Problems of Mineral Processing , vol 53 , no. 2 , pp. 1079-1091 . DOI: 10.5277/ppmp170231 en
dc.identifier.issn 1643-1049
dc.identifier.issn 2084-4735
dc.identifier.other PURE UUID: 9ddaccc2-d6b8-4380-ac87-84fbb21f13ee
dc.identifier.other PURE ITEMURL:
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dc.description.abstract In this research cyanide-free leaching of pure gold and pressure oxidized refractory gold concentrate by thiosulfate-copper-ammonia solutions were examined. A quartz crystal microbalance (QCM) was used to study gold leaching as a factorial series where the best gold leaching rate (2.987 mg/(cm2·h)) was achieved with a solution consisting of 0.2 M (NH4)2S2O3, 1.2 M NH3, 0.01 M CuSO4 and 0.4 M Na2SO4. Temperature had the greatest effect on the gold leaching rate. An increase in thiosulfate concentration (0.1-0.2 M) increased gold dissolution. The combined effect of temperature and ammonia concentration had a statistically significant effect on the gold leaching rate at 0.1 M M2S2O3. Combination of applied potential and NH3:S2O3 ratio had a statistically significant effect on the gold leaching rate at 0.2 M M2S2O3. An increase in applied potential decreased the gold dissolution rate at low ammonia concentrations but increased it at high concentrations. A pressure oxidized gold concentrate was leached for 6 hoursin the batch reactor leaching experiments. The effect of rotative velocity (1.26-1.56 m/s) and slurry density (10-30 wt%) was investigated at the following leaching parameters: 0.2 M Na2S2O3, 0.6 M NH3, 0.01 M CuSO4, 0.4 M Na2SO4. Lower slurry density (10 wt%) resulted in a higher Au leaching efficiency. An increase in the rotation rate did not have an effect on the final Au leaching recovery. The best Au leaching efficiency (89%) was achieved with 590 rpm mixing, 1.56 m/s rotative velocity and 10 wt% slurry density. en
dc.format.extent 13
dc.format.extent 1079-1091
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Physicochemical Problems of Mineral Processing en
dc.relation.ispartofseries Volume 53, issue 2 en
dc.rights openAccess en
dc.subject.other Geology en
dc.subject.other Economic Geology en
dc.subject.other Process Chemistry and Technology en
dc.subject.other Physical and Theoretical Chemistry en
dc.subject.other Materials Chemistry en
dc.subject.other 215 Chemical engineering en
dc.title Thiosulfate-copper-ammonia leaching of pure gold and pressure oxidized concentrate 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 VTT Technical Research Centre of Finland
dc.contributor.department Department of Materials Science and Engineering
dc.subject.keyword Gold leaching
dc.subject.keyword Quartz crystal microbalance
dc.subject.keyword Thiosulfate
dc.subject.keyword Geology
dc.subject.keyword Economic Geology
dc.subject.keyword Process Chemistry and Technology
dc.subject.keyword Physical and Theoretical Chemistry
dc.subject.keyword Materials Chemistry
dc.subject.keyword 215 Chemical engineering
dc.identifier.urn URN:NBN:fi:aalto-201706205701
dc.identifier.doi 10.5277/ppmp170231
dc.type.version publishedVersion

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