重选金铅精矿回收金银工艺研究

Recovery technology of gold and silver from gold-lead gravity concentrate

以某重选金铅精矿为研究对象，研究了提高金银回收率的工艺.研究发现：“摇床富集-精矿火法熔炼-尾矿氰化”工艺能有效回收金银.金精矿摇床试验金和银的回收率分别为89.43%和74.07%.金精矿摇床试验得到的精矿经过火法熔炼，金和银的回收率分别达到99.98%和99.95%；摇床尾矿不经磨矿直接氰化，pH值10~11，NaCN浓度1‰，矿浆浓度50%，浸出24 h，渣中金和银的品位分别降低到6.33 g/t，金和银的浸出率分别达到98.97%和55.94%，NaCN耗量为6.03 kg/t.

Technology of recovery gold and silver is studied to improve recovery ratio from gold-lead gravity concentrate. The results show that the technology of tabling concentration - melting of tabling concentrate -cyaniding of tabling tailing is effective on recovery gold and silver. The recovery ratio of gold and silver on tabling experiment are 89.43 % and 74.07 %, respectively. The recovery ratio of gold and silver on smelting experiment are 99.98%and 99.95%, respectively. Under the condition of pH 10~11, concentration of NaCN 1 ‰, mud concentration 10%, time 24 h, gold and silver in slag of leaching can decrease to 6.33 g /t and 339.6 g /t, respectively. The recovery ratio of gold and silver on leaching experiment are 98.97 % and 55.94 %, respectively. The consumption of NaCN is 6.03 kg/t.