某高砷难溶金矿石浸出特性试验研究

采用超细磨、边磨边浸和强化碱浸等工艺方法考察了某高砷型难溶金矿石的浸出特性。其结果表明,超细磨、边磨边浸和强化碱浸工艺均能有效提高金的浸出率。矿样超细磨至-37μm占99.7%时,金的氰化浸出率从23.7%提高到73.6%,金的非氰化浸出率从18.5%提高到66.9%;在同样磨矿细度条件下进行边磨边浸,而后再继续浸出,金的氰化浸出率进一步提高到82.4%,金的非氰化浸出率提高到72.9%;在同样磨矿细度条件下进行碱浸预处理,碱浸6~9 h金的氰化浸出率为88.3%~87.5%,碱浸9~12 h金的非氰化浸出率为89.7%~90.2%。

Experimental research on leaching characteristics of one high arsenic-containing indissolvable gold ore

The leaching characteristics of one high arsenic-ontaining refractory golds ores were investigated by ul-tra-fine grinding ,leaching while pulverizing in a tower mill and intensified alkaline leaching .The results show that all three can effectively enhance the gold leaching rate .With the particle size ground to 99.7 %under 37 μm,the gold leaching rate was increased from 23.7 % to 73.6 % by cyanidation,or from 18.5 % to 66.9 % by non-cyanide processes .At the same size of grinding ,the process of leaching while pulverizing in the tower mill prior to further leac-hing improves the gold leaching rate by cyanidation from to 82 .4%,or to 72 .9%by non-cyanide processes .And if at the same size of grinding , the pretreatment process of intensified alkaline leaching obtains a gold leaching rate of 88.3 %to 87.5 %by cyanidation with alkaline leaching period lasting 6 to 9 h,or 89.7 %to 90.2 %by non-cya-nide processes with alkaline leaching period 9 to 12 h.