用硫脲从脱硫锌精矿渣中浸出银的试验研究

Study on Leaching of Silver From Desulphurized Slag of Zinc Sulfide Concentrate Using Thiourea

利用正交试验法研究了用硫脲从脱硫锌精矿渣中浸出银的工艺条件。结果表明,在硫脲浓度0.40mol/L,渣浆浓度10%,Fe3+浓度0.30 mol/L,浸出时间2 h,反应温度303 K,表面活性剂十二烷基苯磺酸钠质量浓度0.15 g/L,搅拌速率300 r/min的最佳条件下,银的浸出率达86%以上。该方法具有选择性好、试剂毒性小等优点。

The process conditions for leaching silver from deslphurized slag of zinc sulfide concentrate by orthogonal experimental method are determined. The test results show that at the optimum conditions of thiourea concentration of 0.40 mol/L, slurry concentration of 10 %, Fe^3＋ concentration of 0.30 g/L,leaching time of 2 hours, leaching temperature of 303 K, surfactant dosage of 0. 15 g/L and stirring-speed of 300 r/min, leaching rate of silver is up to 86%. The method has high selectivity and low reagent toxicity.