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- W2989135962 endingPage "105204" @default.
- W2989135962 startingPage "105204" @default.
- W2989135962 abstract "Thiosulfate is considered to be one of the most promising alternative reagents to cyanide due to its non-toxicity and excellent leaching efficiency. However, the use of ammonia as the additive and high reagent consumption have severely limited the development and commercial application of the traditional copper-ammonia-thiosulfate leaching system. In this work, the potential use of an environmentally friendly copper-citrate-thiosulfate leaching system for gold leaching from a refractory carbonaceous gold concentrate has been examined. The experimental results showed that when citrate served as the stabilizer, the copper-citrate-thiosulfate system exhibited similar extraction capability for gold with a significant decrease in thiosulfate consumption compared to the traditional copper-ammonia-thiosulfate system. Thiosulfate consumption increased with Cu2+ and S2O32− concentration, leaching time and temperature, but decreased with citrate concentration and initial pH. The mechanism of the catalysis of gold dissolution in copper-citrate-thiosulfate solutions by the binuclear cupric-citrate complex (Cu2Cit2H−24−) is presented based on the thermodynamic analysis. The stability of the Cu2Cit2H−24− complex decreased with increasing Cu2+ and S2O32− concentration, increased with an increase of citrate concentration. Moreover, the microwave roasting process applied to concentrate facilitated the subsequent gold leaching process probably by exposing encapsulated gold to thiosulfate solutions." @default.
- W2989135962 created "2019-11-22" @default.
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- W2989135962 date "2020-01-01" @default.
- W2989135962 modified "2023-10-17" @default.
- W2989135962 title "Eco-friendly leaching of gold from a carbonaceous gold concentrate in copper-citrate-thiosulfate solutions" @default.
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- W2989135962 doi "https://doi.org/10.1016/j.hydromet.2019.105204" @default.
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