焙烧-氰化浸出锰银矿中银的扩大试验

Pilot-scale Study of Roasting-cyanide Leaching Silver from Manganese-silver Ore

采用添加剂焙烧-氰化浸出中试处理锰银矿。回转窑连续运转80 h,物料焙烧时间30±5 min,所得焙砂产率85.54%,焙砂中银含量237.73 g/t、锰含量24.68%,银回收率99.19%,锰回收率98.70%;焙砂经500 L反应釜直接氰化浸出,浸出液固比2:1～2.2:1,时间6～15 h,氰化钠用量700 g/t原矿,所得银浸出率86.5%,氰化尾渣满足冶金用锰矿石标准。

Additive roasting-cyanide leaching process was adopted for treating manganese-silver ore. The rotary kiln was continuously operated for 80 hours, and the ore was roasted for 30±5 minutes. The results showed that the content of silver and manganese was 237.73 g/t and 24.68% in the calcine, and that the recovery of silver and manganese was 99.19% and 98.70%, respectively. The resulted calcine was leached in 500 L reactor with a solid liquid ratio of 2:1~2.2:1, 6~15 h of leaching time, and 700 g/t of NaCN. Leaching results showed that the leaching ratio of silver was up to 86.5%, and that the residue met the standards of manganese ore for metallurgy.