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- W2039692486 abstract "Abstract An oxidative pressure leaching process to extract silver from the silver-rich residue of demanganized silver–manganese sulfide concentrate with ammonium thiocyanate solution was investigated in this paper. The effects of several factors: temperature, leaching time, oxygen pressure, Fe 3+ concentration, lignin concentration, and initial pH of the leaching reagent, on the extraction percentages of silver were studied. The following optimized leaching conditions were obtained: Fe 3+ concentration 4.2 g/L, lignin concentration 0.6 g/L, NH 4 SCN concentration 1.5 M, initial pH value 1.8, and oxygen pressure 1.4 MPa at 120 °C for 3 h. Under these optimized conditions, the average extraction percentage of silver was about 88% and 6.5% of NH 4 SCN was lost after four cycles. The ammonium thiocyanate method has advantages over the conventional cyanidation method and chlorination method, with a higher efficiency, lower toxicity and better selectivity and stability." @default.
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- W2039692486 date "2011-02-02" @default.
- W2039692486 modified "2023-09-27" @default.
- W2039692486 title "Selective leaching of silver-rich residue in NH4SCN solution under oxygen pressure" @default.
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- W2039692486 doi "https://doi.org/10.1016/j.seppur.2010.11.003" @default.
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