控制氧含量抑制黄铁矿浸出研究

Inhibit Bioleaching of Pyrite by Controlling Oxygen Content

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,降低浸出液中氧化还原电位,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的同时接入富硫菌液的条件下,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。

Excess sulfuric acid was produced during bioleaching of secondary copper sulfides with high S/Cu.In order to solve this problem,it was important to control the growth of iron-oxidizing bacteria by sparging with N2 and CO2,to decrease the redox potential,and to inhibit the leaching of pyrite.The results showed that the sulfur-oxidizing bacteria were the dominant bacteria by sparging with N2 and CO2,keeping the solution redox potential lower than 800 mV and pH value higher than 1.0,the iron leaching rate coul...