碳质卡林型金矿细菌氧化-氰化浸出研究

利用混合嗜酸菌对云南某碳质卡林型金矿进行了细菌氧化和氰化浸出的试验研究.研究表明，该矿直接氰化金的回收率非常低，即使采用碳浆浸出的氰化方法，金的回收率只有129%.细菌氧化工艺可以有效地解决硫化物包裹金的问题，大幅度提高金的浸出率，同时利用活性碳的竞争吸附，可以有效地解决碳质物的“劫金”作用，进一步提高金的回收率.通过细菌氧化-碳浆氰化联合处理工艺，金的回收率达到8239%，同时氰化钠的用量降低4968%，因此细菌氧化-碳浆氰化浸出工艺是处理碳质卡林型金矿的有效方法.

Bacterial Oxidation and Cyanide Leaching Process for Carbonaceous Carlin Type Gold Deposit

Bacterial oxidation by mixed acidophilic bacteria and cyanide leaching experiments for a carbonaceous Carlin type gold deposit in Yunnan province were carried out. The results showed that the gold recovery of direct cyanide leaching is very low (129%). The sulfide minerals packing problem can be effectively solved by bacterial oxidation process， which greatly increases the gold recovery. But the pre robbing effect can’t be eliminated by this process. The absorption effect of carbonaceous substances can be effectively inhibited by carbon cyanide leaching， which can further improve gold recovery for bacterial oxidation residue. Through bacterial oxidation and carbon cyanide leaching process， the gold recovery can reach 8239% and the cyanide reagent is reduced by 4968%. So the bacteria oxidation and carbon cyanide leaching process is an effective method for carbonaceous Carlin type gold deposits. .