摘要
自然界中大多数次生硫化铜矿都伴生一定量的黄铁矿,在生物浸出过程中黄铁矿过量溶解,造成浸出体系中铁酸不平衡。根据原子轨道及分子理论,分析了黄铁矿的电化学溶解机理,认为氧化还原电位是影响黄铁矿溶解的关键因素。用黄铁矿纯矿物进行硫酸浸出、硫酸高铁浸出和钩端螺旋菌细菌浸出试验,结果证实,无菌时,体系氧化还原电位基本低于700 mV,黄铁矿很难溶解,铁浸出率低于10%:有菌时,体系氧化还原电位可提高到800 mV以上,从而加速了黄铁矿的溶解,铁浸出率最高可达67%。
Most of secondary copper sulfides are associated with pyrite in the nature. Pyrite＇s over-dissolution in bioleaching can lead to acid-iron imbalance in the leaching system. Based on the atom orbit and molecular theory, the electrochemical dissolution mechanism of pyrite is analyzed and it is considered that redox potential is the key factor influencing the pyrite dissolution. Tests on pure pyrite by sulfuric acid leaching, ferric sulfate leaching and Leptospirillum are made. The results validate that when there are no bacteria, the redox potential will be basically lower than 700mV and the pyrite is hardly dissolved, with an iron leaching rate lower than 10%. When there are bacteria, the redox potential can be raised to higher than 800mV, speeding up the pyrite dissolution, with the iron leaching rate as high as 67%.
出处
《金属矿山》
CAS
北大核心
2007年第10期64-67,共4页
Metal Mine
基金
国家重点基础研究发展计划(973计划)项目(编号:2004CB619206)
