针对高硫铜比次生硫化铜矿生物浸出过程中酸铁过剩问题,研究了通过通入N2和CO2限制矿柱中氧含量,调控铁氧化菌的生长,降低浸81液中氧化还原电位,有效抑制黄铁矿的溶解,减少浸出过程酸铁产量.结果表明:通入CO2和通入N2的同时接人富硫菌液的条件下,有效地限制矿柱中氧含量,使矿柱中的细菌以硫菌为优势菌群,浸出液中氧化还原电位低于800 mV,pH保持在1.0以上.浸出180 d,铜浸出率为77.52%,铁浸出为16.46%,电位为789 mV,pH为1.08,在保证铜浸出率基本不变的情况下有效降低铁的浸出率,浸出体系酸铁基本维持平衡.
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