Improving gold recovery from a refractory ore via Na₂SO₄ assisted roasting and alkaline Na₂S leaching
Journal Publication ResearchOnline@JCUAbstract
Gold recovery from refractory gold ores with controlled roasting remained well below 80%. Na2SO4 was added in an O-2-enriched single stage roasting of a refractory gold ore to improve its gold recovery. Changes in physicochemical properties of the calcines suggested that this reduced the sintering as well as facilitated the formation of pores and a water soluble phase within the calcine. Thermodynamic analysis and leaching results demonstrated that Na2S solutions could effectively remove Sb species from the calcine. An extraction process that includes Na2SO4 assisted roasting and alkaline Na2S leaching is shown to be able to achieve a gold recovery of over 95% from the refractory ore.
Journal
Hydrometallurgy
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Volume
185
ISBN/ISSN
1879-1158
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Pages Count
9
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Publisher
Elsevier
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EISSN
N/A
DOI
10.1016/j.hydromet.2019.02.008