某金矿金浸出率不高的原因及解决措施

某金矿采用堆浸工艺，金的浸出率一直较低，改用全泥氰化浸出工艺进行试验，金的浸出率也没有明显的提高。为此，对该矿矿石进行了工艺矿物学研究，查明了影响金浸出的主要因素为雄黄、雌黄等。根据工艺矿物学研究结果，采用原矿先经浮选除去雄黄、雌黄等硫化物，浮选精矿预处理后氰化浸出，浮选尾矿直接氰化浸出的方案进行试验，金的总浸出率达到88.52%，较原矿直接全泥氰化浸出提高25.02个百分点。

Causes and Solution for the Low Gold Leaching Rate at a Certain Gold Mine

A gold mine adopted a heap leaching process but the gold leaching rate had been low. No evident improvement was made when a full-ore cyaniding leading process was tested. A process mineralogical study was thus made and it was founded that it is mainly realgar and orpiment that affect the gold leaching. Based on this result, a test was made, in which the run-of-mine ore was first treated by flotation to remove the sulfides such as realgar and orpiment, and the flotation concentrate was treated by cyaniding leaching after a pre-treatment while the flotation tailing was directly fed to cyaniding leaching. The total gold leaching rate reached 88.52%, an increase of 25.02 percentage points compared with that of direct cyaniding leaching of run-of-mine ore.