难处理金矿中,金为微细浸染型嵌布在黄铁矿和毒砂的晶格中而不能被充分浸出.本文通过热力学计算绘制了298.15KFeS2-FeAsS-H2O系的电位-pH图,由图可知黄铁矿和毒砂均可以被O2等氧化剂分解.FeAsS的稳定区完全包含在FeS2的稳定区范围内,说明在酸性条件下毒砂比黄铁矿的稳定性差,更容易被分解.当电位及酸度较高时,黄铁矿及毒砂中的硫以稳定的HSO4-、SO42-形式存在,而砷以H3AsO4的形式存在,表明预处理过程能够将包裹在金表面的硫化矿物解离脱除.热力学计算的结果为难处理金矿的浸出预处理过程提供了理论依据.
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