从高硫多金属金精矿中提取金银铜试验研究

Experimental study on extraction of gold,silver and copper from high-sulfur content and polymetallic gold concentrates

采用焙烧—酸浸—氰化工艺从高硫多金属金精矿中提取金、银、铜。其试验结果表明:在最佳条件下,金、银、铜的平均浸出率分别可达到96.56%、79.12%、91.33%。通过对比金精矿、焙砂、氰化渣中金、银的化学物相可知,硅酸盐包裹金、银不易被氰化浸出,而加入复合添加剂焙烧,硅酸盐包裹的金、银品位大幅度下降,由直接焙烧的2.05 g/t、163.35 g/t分别降到0.81 g/t、25.24 g/t。

Gold , silver and copper are extracted from high-sulfur content and polymetallic gold concentrates by roasting - acid leaching - cyanidation process. It is revealed that under optimal conditions the leaching rates of gold, silver and copper were respectively were 96.56 % ,79.12 % and 91.33 %. By comparing the chemical phase of gold and silver in gold concentrates, calcines and cyanidation slags,it is known that the gold and silver encapsulated in sili- cates are difficult to leach by cyanide, but with composite additive in roasting, the amount of gold and silver encapsula- ted in silicates is greatly reduced obviously,from 2.05 g/t,163.35 g/t respectively to 0.18 g/t,25.24 g/t.