某含铜难处理金矿提金试验

分别采用直接氰化法、浮选—氰化法和碘化法处理某含铜难处理金矿,并考察了搅拌强度、浸出时间和矿浆温度对碘化浸金效果的影响。结果表明,采用直接氰化法在氰化钠用量为10kg/t时,金浸出率为82%左右,铜浸出率为40%左右;利用浮选—氰化法得到的浮选精矿中金、铜品位分别为36.9g/t和4.69%,金、铜回收率分别为57.41%和62.35%,浮选精矿中砷品位达到4.2%,浮选尾矿氰化金的浸出率为65.96%;碘化试验中金浸出率达到85.3%,铜浸出率低于1%。碘化法比较适宜处理该金矿,其最佳工艺条件为:搅拌强度400r/min、浸出时间2h、矿浆温度298K。

Experiment of Gold Recovery from Copper-bearing Refractory Gold Ores

Gold was recovered from one copper-bearing and arsenic-bearing refractory gold ore by direct-cyaniding, flotation-cyaniding and iodide process, respectively. The effects of stirring intensity, leaching time and slurry temperature on gold leaching rate by iodide process were investigated. The results show that directly cyaniding leaching rate of gold and copper is 82% and 40% respectively. The flotation concentrate with Cu/Au grade of 4.69%/36.9 g/t and Cu/Au recovery of 62.35%/57.41% was obtained by bulk flotation. The flotation tailings were cyaniding leached with gold recovery of 65.96%. The leaching rate of gold is 85.3% and leaching rate of copper is 1% below in iodide process. The optimum experimental conditions for iodide process include stirring intensity of 400 r/min, leaching time of 2 h and slurry temperature of 298 K.