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- W2047489890 abstract "The sponge gold (99.92 % pure) has been leached with ammonium thiosulfate solution. In this investigation, the gold leaching rate (extraction rate) and the thiosulfate oxidation rate (consumption rate) have been studied on the effects of CuSO4, (NH4)2S2O3, (NH4)2SO4, NH4OH, stirring speed and retention time. The copper ion acts as a catalyst in gold dissolution, on the other hand, it also accelerates oxidation of thiosulfate (consumption). It was found that the best gold extraction was obtained at 12 hours under following optimum conditions:0.8 ∼ 1.0 mol / l (NH4)2S2O3, 0.03 mol / l CuSO4, 2.0 ∼ 3.0 mol / l NH4OH, 0.4 ∼ 0.5 mol / l (NH4)2SO4, pH 10 ± 0.2 and 150 rpm. The thiosulfate oxidation is about 15 % of the initial concentration." @default.
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- W2047489890 date "2001-01-01" @default.
- W2047489890 modified "2023-09-27" @default.
- W2047489890 title "Gold Leaching by Using Ammonium Thiosulfate Solution." @default.
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- W2047489890 doi "https://doi.org/10.2473/shigentosozai.117.221" @default.
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