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Selective leaching of silver-rich residue in NH4SCN solution under oxygen pressure

机译：氧气压力下NH4SCN溶液中富银残渣的选择性浸出

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摘要

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, Iignin 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, Iignin concentration 0.6 g/L, NH4SCN 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 NH4SCN 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.
机译：本文研究了一种氧化压力浸出工艺，用硫氰酸铵溶液从脱锰的银锰硫化精矿的富银残渣中提取银。研究了温度，浸出时间，氧气压力，Fe〜（3+）浓度，木质素浓度和浸出试剂的初始pH等几个因素对银的萃取率的影响。获得以下优化的浸出条件：Fe〜（3+）浓度为4.2 g / L，木质素浓度为0.6 g / L，NH4SCN浓度为1.5 M，初始pH值为1.8，以及氧气压力在120°C下持续3 h的压力为1.4 MPa。在这些优化的条件下，四个循环后，银的平均提取百分比约为88％，并且NH4SCN的损失为6.5％。硫氰酸铵法与常规氰化法和氯化法相比，具有效率高，毒性低，选择性和稳定性好的优点。

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