Glycine leaching of Sarcheshmeh chalcopyrite concentrate at high pulp densities in a stirred tank reactor

dc.contributorAalto Universityen
dc.contributor.authorKhezri Khabisi, Maryamen_US
dc.contributor.authorRezai, Bahramen_US
dc.contributor.authorAbdollahzdeh, Ali Akbaren_US
dc.contributor.authorMolaeinasab, Mehdien_US
dc.contributor.authorWilson, Benjamin P.en_US
dc.contributor.authorLundström, Marien_US
dc.contributor.departmentDepartment of Chemical and Metallurgical Engineeringen
dc.contributor.groupauthorHydrometallurgy and Corrosionen
dc.contributor.organizationAmirkabir University of Technologyen_US
dc.contributor.organizationUniversity of Kashanen_US
dc.contributor.organizationSarcheshmeh Copper Complexen_US
dc.description.abstractThe simplest amino acid, glycine has recently been reported as a safe and environmentally benign reagent for the extraction of copper from both oxide and sulfide minerals. In the current study, leaching of a chalcopyrite concentrate from the Sarcheshmeh Copper Mine (Kerman, Iran) was conducted in stirred tank reactors in the presence of a glycine medium. The effect of some critical leaching parameters including glycine concentration (0.4–2 M), temperature (30–90 °C), stirring rate (250–750 rpm), pH (9–12), oxygen flowrate (0.5–2 L/min) and pulp density (1–20%) was investigated on copper recovery from the chalcopyrite concentrate. Results show that an increase in temperature from 30 to 60 ˚C enhanced the copper extraction, whereas at conditions > 60 ˚C a decrease in copper extraction was observed, probably as a result of the conversion of glycine to glycinate and decrease in oxygen solubility. Moreover, prolonged leaching times at higher pH levels (10.5 and 12) led to a decrease in the extraction of copper, primarily due to the chemical precipitation of copper sulfide and crystallization of copper glycinate. By increasing the pulp density from 1 to 20%, copper extraction declined significantly primarily as a consequence of the partial dissolved copper precipitation at higher copper concentrations. SEM/WDX analyses were subsequently used in order to evaluate the leach residues. Further investigation determined that the activation energy of the glycine leaching of concentrate was 37.4 KJ/mol, thus the kinetics were controlled by diffusion of the reagents through the product layer. From these results, it is evident that due to the high initial rate of glycine leaching and the precipitation of copper-bearing phases (i.e. copper glycinate and covellite) at high pulp densities, glycine leaching processes are recommended for the treatment of low grade chalcopyrite concentrates, ores or tailings.en
dc.description.versionPeer revieweden
dc.identifier.citationKhezri Khabisi, M, Rezai, B, Abdollahzdeh, A A, Molaeinasab, M, Wilson, B P & Lundström, M 2020, ' Glycine leaching of Sarcheshmeh chalcopyrite concentrate at high pulp densities in a stirred tank reactor ', Minerals Engineering, vol. 157, 106555 .
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dc.relation.ispartofseriesMinerals Engineeringen
dc.relation.ispartofseriesVolume 157en
dc.subject.keywordChalcopyrite concentrateen_US
dc.titleGlycine leaching of Sarcheshmeh chalcopyrite concentrate at high pulp densities in a stirred tank reactoren
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi