根据氯化物体系中金的浸出热力学,预测合理的电位和pH值范围.通过对硫化金精矿压热预处理后的氧化渣进行液氯化浸出试验,考察了浸出过程中电位变化与浸金率之间的关系.氯化浸出金适宜的热力学条件为pH值8以下、电位0.9V以上.从次氯酸钠溶液的氧化能力角度考虑,pH值在4～5.5时其氧化能力较强,此时溶液中氧化剂以HClO为主.对金精矿压热氧化渣的次氯酸钠浸出,为得到较高的浸金率,必须控制至少2h电位在1.0V以上.若在浸出过程中电位低于1.0V,已溶解生成的金氯络合物会再沉淀,使浸金率下降.在初始有效氯质量分数为0.5％、初始pH值为4.0时,可保证2h内电位在1.0V以上,此时浸金率可达到96％以上.
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