Significance of Fe contents on the surface of the gold ores in gold leaching by thiourea and ethylene thiourea

金氰化 浸出(土壤学) 硫脲 湿法冶金 金矿石 黄金提取 化学 氰化物 冶金 核化学 无机化学 材料科学 地质学 有机化学 土壤科学 土壤水分 硫酸
作者
Keiko Sasaki,Ikumi Suyama,Yuji Aoki,Kojo T. Konadu,Cindy,Chitiphon Chuaicham,Hajime Miki,Tsuyoshi Hirajima
出处
期刊:Minerals Engineering [Elsevier BV]
卷期号:191: 107957-107957 被引量:3
标识
DOI:10.1016/j.mineng.2022.107957
摘要

Environmentally friendly ligands, alternatives to cyanide, are desired to extract gold for the sustainable hydrometallurgy of gold. Leaching characteristics of gold were examined using thiourea (TU) and ethylene thiourea (ETU) as ligands from three types of gold ores with different Fe contents from 2.70 to 14.09 wt% under the acidic condition. The Au recovery by TU leaching reached the extractable maximum with the lowest Fe-bearing gold ore. This type of gold ore is suitable for TU/ETU leaching. The highest Fe-bearing gold ore was the most difficult to extract Au in ETU/TU leaching. There are at least two detrimental factors in TU leaching of Fe-rich gold ores, that is (i) the oxidative decomposition of TU, and (ii) complexation of TU with Fe3+, which both cause to deduce the complexation of TU with Au+. However, adding Na2SO3 improved the Au extraction from such an ore to reduce Fe3+ to Fe2+. ETU facilitated the formation of more stable complexes with Au than TU against the coexisting Fe3+. This finding is useful when considering the cyanide-free leaching of different types of gold ores.
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