某复杂银精矿提金、银工艺研究

Extracting process of gold and silver from a complex silver concentrate

采用一段焙烧-酸浸-氰化工艺处理某复杂银精矿，结果表明：在焙烧温度923K，焙烧时间2h，酸浸反应液固比1．5：1，反应pH值为0．8-1．0，反应温度368K，反应时间1．5h，氰化反应液固比2：1，反应pH值为10-11，NaCN浓度1．5‰。反应时间48h条件下，氰化浸出时Au、Ag的浸出率分别为72．01％、18．41％，尾渣银含量355g／t．在复杂银精矿与其它矿样按一定比例重新配矿后，采用相同试验条件，氰化时Au、Ag的浸出率分别提高24．89％、15．66％，尾渣中银含量降低了223．35∥t．

Roasting-acid leaching-cyanided process is adopted to treat the complex silver concentrate. The result shows that the cyanide leaching rate of gold and silver are 72.01% and 18.41% respectively, with the silver content of 355 g/t in residue, under the condition that roasting temperature is 923 K with roasting time of 2 h, sulfuric acid leaching liquid-solid ratio of 1.5：1, reaction pH value of 0.8 ~1.0, acid leaching temperature of 368 K with reaction time of 1.5 h, cyanided liquid-solid ratio of 2：lwith reaction pH value of 10~11, sodium cyanide concentration of 1.5 %0 with reaction time of 48 h. Under the same conditions, when complex silver concentrate blended with other mineral secondary ore according to certain proportion, the cyanide leaching rate of gold and silver raises by 24.89 % and 15.66 % respectively. The silver content reduces by 223.35 g/t in residue.