Improving gold recovery from a refractory ore via Na₂SO₄ assisted roasting and alkaline Na₂S leaching

Liu, Xiaoliang, Li, Qian, Zhang, Yan, Jiang, Tao, Yang, Yongbin, Xu, Bin, and He, Yinghe (2019) Improving gold recovery from a refractory ore via Na₂SO₄ assisted roasting and alkaline Na₂S leaching. Hydrometallurgy, 185. pp. 133-141.

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Abstract

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.

Item ID: 58411
Item Type: Article (Research - C1)
ISSN: 1879-1158
Keywords: Refractory gold ore, Na2SO4 assisted roasting, Thermodynamic analysis, Alkaline Na2S leaching
Copyright Information: © 2019 Elsevier B.V. All rights reserved.
Funders: National Natural Science Foundation of China (NSFC), Fundamental Research Funds for the Central Universities of China (FRFCUC), China Scholarship Council (CRC)
Date Deposited: 29 May 2019 07:33
FoR Codes: 09 ENGINEERING > 0914 Resources Engineering and Extractive Metallurgy > 091403 Hydrometallurgy @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8402 Primary Mining and Extraction Processes of Mineral Resources > 840205 Mining and Extraction of Precious (Noble) Metal Ores @ 100%
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