模拟生物堆浸工艺条件,在硫酸铁酸性介质体系下,进行硫砷铜矿化学浸出动力学实验研究.硫砷铜矿化学性质稳定,在初始Fe3+浓度31 g·L-1,Fe2+浓度0.02 g·L-1,初始pH=1.00--.0.05,氧化还原电位恒定在(900±5) mV,30℃条件下浸出96 h,硫砷铜矿的浸出率仅有2.49％.不同电位对硫砷铜矿浸出的影响结果表明,硫砷铜矿的浸出率与电位呈弱正相关,30,45,60,75℃时硫砷铜矿的浸出率与电位的关联指数分别为0.0037,0.0053,0.0062,0.0120.低温下电位对溶解速率影响很小,高温下较显著.研究了温度对硫砷铜矿浸出的影响,氧化还原电位在800 mV时,温度在30 ～75℃范围,硫砷铜矿硫酸铁酸性化学浸出的表观活化能Ea=57.87 kJ·mol-1.实验结果表明,硫酸铁酸性浸出硫砷铜矿符合典型的缩核模型,速率受表面化学反应控制,而非扩散.结合低品位次生硫化铜矿生物堆浸生产实际,为生产实践提出了工艺优化措施.
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