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Use of mesalime and electric arc furnace (EAF) dust as neutralising agents in biooxidation and their effects on gold recovery in subsequent cyanidation
Boliden Mineral AB.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.
2010 (engelsk)Inngår i: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 23, nr 9, s. 731-738Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The cost of lime/limestone for neutralisation is the second largest operating cost in bioleaching. Therefore, these studies have been conducted with the aim to investigate the possibilities for use of by-products such as mesalime and electric arc furnace (EAF) dust for neutralisation during biooxidation of a refractory gold concentrate. Experiments were carried out using a retention time of 57 h in a one-stage reactor and the influence of two industrial by-products on the biooxidation performance was evaluated. The neutralising capacity of EAF dust was lower, while the mesalime was similar to the Ca(OH)2 reference. The arsenopyrite oxidation in experiments ranged from 85% to 90%, whereas the pyrite oxidation was 63-74%. In subsequent cyanidation, final gold recoveries of 90% were achieved in bioresidues from mesalime and Ca(OH)2, while the EAF dust bioresidue had a recovery of 85%. A comparatively high elemental sulphur content in EAF dust probably encapsulates part of the gold, which explains the lower recovery for the EAF dust bioresidue despite a longer residence time. Cyanide consumption was relatively high and ranged from 8.1 to 9.2 kg/ton feed after 24 h of cyanidation. Overall, the by-products tested here have proved to be feasible options as neutralising agents in bioleaching operations.

sted, utgiver, år, opplag, sider
2010. Vol. 23, nr 9, s. 731-738
Emneord [en]
Mesalime, EAF dust, Neutralisation, Biooxidation, Cyanidation, Other technology - Environmental engineering
Emneord [sv]
Övriga teknikvetenskaper - Miljöteknik
HSV kategori
Forskningsprogram
Processmetallurgi
Identifikatorer
URN: urn:nbn:se:ltu:diva-12196DOI: 10.1016/j.mineng.2010.04.012ISI: 000280614700010Scopus ID: 2-s2.0-77955307018Lokal ID: b4a61e90-5529-11df-a0f4-000ea68e967bOAI: oai:DiVA.org:ltu-12196DiVA, id: diva2:985146
Merknad
Validerad; 2010; 20100501 (sekgah)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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Gahan, Chandra SekharSandström, Åke

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