The thiosulfate is generally a sodium salt and an ammonium salt of thiosulfuric acid, which are inexpensive, have a fast immersion gold , are non-toxic, are not sensitive to impurities, and have high immersion gold index.
The kinetics of gold dissolution in sodium thiosulfate solution by Baghdad Saliang et al. showed that the dissolution rate of gold is linear with temperature in the range of 45-85 °C, but in order to avoid violent decomposition of thiosulfate, the leaching temperature should be Controlled at 65.75 ° C. Rogerzhkov et al. used a thiosulfate solution containing ammonia and an oxidant to extract gold from ore into another kinetic study, which concluded that only at higher temperature conditions in the hot press leacher ( 130 to 140 ° C), in order to achieve satisfactory speed and recovery. Kakowski and others also found that copper ions catalyze the dissolution of gold by thiosulfate, which can increase the dissolution rate of gold by 17 to 19 times. China's Jiang Tao, Cao Changlin and others have conducted a detailed study on the mechanism of thiosulfate gold extraction.
However, due to the high requirement of the thiosulfate method and the chemical instability of the thiosulfate, this method has not been popularized and applied.
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