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针对紫金山铜矿堆浸过程中,在辉铜矿和铜蓝等有用矿物浸出的同时,有黄铁矿被大量浸出,造成浸出液中Fe3+浓度过高的现状,研究了细菌浸出黄铁矿的氧化行为和机理,重点考察了Fe3+的化学氧化以及细菌浸出黄铁矿过程的影响因素.研究结果表明,在有菌条件下,pH值为1.6时,混合矿浸出初期,黄铁矿的浸出率仅为5%～8%;随着浸出时间的增加,氧化还原电位升高,浸出15d后,氧化还原电位上升到500mV以上时,黄铁矿的浸出率可达25%.说明氧化还原电位是细菌浸出黄铁矿过程的重要影响因素.机理研究表明,细菌浸出黄铁矿是以间接反应为主,细菌在黄铁矿表面的吸附对黄铁矿的浸出具有协同作用.
Aiming at the leaching process of Zijinshan copper mine, leaching of chalcopyrite, copper blue and other useful minerals at the same time, a large number of pyrite was leached, resulting in leachate Fe3 + concentration is too high, the study of bacterial leaching pyrite Oxidative behavior and mechanism of Fe3 +, and investigated the factors that affect the chemical oxidation of Fe3 + and the leaching of pyrite from bacteria.The results showed that under the conditions of bacteria, pH value was 1.6, the leaching rate of pyrite Only 5% ~ 8%. With the increase of leaching time, the redox potential increased, and after 15 days of leaching, the leaching rate of pyrite reaches 25% when the redox potential rises to above 500mV, indicating that the redox potential is Bacteria leaching pyrite important influencing factors. Mechanism studies show that bacterial leaching pyrite is mainly indirect reactions, bacterial adsorption on pyrite surface has a synergistic effect on pyrite leaching.