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EDTA-enhanced cyanidation of refractory bio-oxidised flotation gold concentrates

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dc.contributor.authorAsamoah, R.K.
dc.date.issued2020
dc.descriptionData source: Supplementary data, https://doi.org/10.1016/j.hydromet.2020.105312
dc.description.abstractIn this paper, ethylenediaminetetraacetic acid (EDTA) was used to activate refractory bio-oxidised flotation gold concentrate and improve gold extraction efficacy during alkaline cyanide leaching. The results showed that EDTA activation influences physico-chemical properties such as particle size distribution, surface area and mineralogy, rate and yield of gold leaching, and overall reagent (sodium cyanide and sodium hydroxide) consumption. Specifically, EDTA activation reduced the particle size and increased BET surface area by eliminating refractory secondary sulphate minerals such as gypsum and jarosite prior to /or during alkaline cyanide leaching. The proposed gold extraction enhancement mechanism included disintegration of gold-encapsulating gangue mineral agglomerates, and elimination of thin film refractory jarosite and gypsum coatings from gold surfaces, leading to easy cyanide access to gold. Lower sodium cyanide and sodium hydroxide consumption during alkaline cyanide leaching were also observed for leaching systems involving EDTA compared with the as-received bio-oxidised flotation concentrate leaching. The results show good promise for designing smarter processing routes targeting higher gold extraction from complex, refractory ore mineralogy
dc.identifier.citationHydrometallurgy, 2020; 193(105312):1-10
dc.identifier.doi10.1016/j.hydromet.2020.105312
dc.identifier.issn0304-386X
dc.identifier.issn1879-1158
dc.identifier.orcidAsamoah, R.K. [0000-0002-6871-6027]
dc.identifier.urihttps://hdl.handle.net/11541.2/142221
dc.language.isoen
dc.publisherElsevier
dc.rightsCrown Copyright 2020 Access Condition Notes: Accepted manuscript available on Open Access
dc.source.urihttps://doi.org/10.1016/j.hydromet.2020.105312
dc.subjectalkaline cyanide leaching
dc.subjectEDTA-enhanced gold leaching
dc.subjectreagent consumption
dc.subjectrefractory bio-oxidised gold ores
dc.titleEDTA-enhanced cyanidation of refractory bio-oxidised flotation gold concentrates
dc.typeJournal article
pubs.publication-statusPublished
ror.fileinfo12248679240001831 13248679230001831 9916383800301831_AM
ror.mmsid9916383800301831

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