难浸金矿常温常压强化碱浸预处理新工艺

Intensified Alkiline Leaching Pretreatment of Refractory Gold Ore at Ambient Temperature and Atmosphere Pressure

采用物理与化学综合分离方法 ,利用边磨边浸工艺及其主体设备 -塔式磨浸机 ,对含砷难浸金矿进行超细磨 ,然后在常温常压下 ,利用强化预处理搅拌槽进行强化碱浸预处理 ,从而脱砷脱硫或使金与硫化物充分解离 ,再进行氰化 ,实现高效提金。对我国十余种典型的含砷难浸金矿在矿浆浓度 40 % ,环境温度 -4～ 35℃条件下进行预处理 ,金的浸出率从预处理前的 8%～ 2 0 % ,提高到 93%～ 98%。建成 10t/d规模的工业试验及生产厂 ,30t/d的预处理厂正在建设中。

The arsenic containing refractory gold ore (or concentrate) is pretreated with the physical and chemical synthetic separation process in a ultra-fine grinding-leaching tower mill The ore (or concentrate) is ultra-fine ground to 91%～99% -35μm, then is intensively leached with NaOH solution in a forced agitator tank with the pulp concentration of 40% at ambient temperature (-4～35℃) and atmosphere pressure The arsenic and some sulfide minerals are selectively oxidized, and the gold minerals are exposed, then the gold is effectively recovered by cyanide leaching The 11 sorts of typical refractory gold ores in China are pretreated by the new process, the gold leaching rates by cyanide are increased from 8%～20% before pretreatment to 93%～98% A pretreatment pilot plant of refractory gold concentrate with 10t/d capacity is successfully built and operated Another 30t/d production system is going to be built