浸矿菌液/天然黄铁矿界面的动态氧化研究

细菌氧化黄铁矿的过程是细菌破坏黄铁矿化学键和建立新化学键的过程·细菌在浸矿菌液/天然黄铁矿界面上产生一系列的生物化学反应·由于黄铁矿的(100),(110),(111)面上亚铁离子和对硫离子团的分布形式、密度不相同,因此菌液/黄铁矿各种界面的氧化腐蚀程度也有差异·通过对天然黄铁矿(100),(110)和(111)面的细菌氧化动态试验研究,可以将细菌氧化黄铁矿的过程分为三个阶段:第一阶段是黄铁矿的点状氧化阶段;第二阶段为黄铁矿面状氧化阶段;第三阶段为黄铁矿遭到严重的氧化腐蚀,最终导致晶体破坏·细菌对黄铁矿不同面氧化强度顺序为(111)>(110)>(100)·

Study on Dynamic Bio-Oxidation of Interface Between Leaching Bacterium Solution and Natural Pyrite

The process of oxidizing pyrite by leaching bacterium is such a process that the old chemical bond is broken with new chemical bond formed by leaching bacterium on the pyrite crystal surface. The interfaces between leaching bacterium solution and natural pyrite produce a series of biochemical reactions. Because of the different distribution patterns and densities of Fe~(2+) and S_2]~(2-) of pyrite on crystal faces (100), (110) and (111), the extensions of their bio-oxidation and corrosion are also different. The process of pyrite bio-oxidation can be divided into three phases according to the dynamic test of bio-oxidation of pyrite (100), (110) and (111). The first is an initial one of pyrite bio-oxidation named as pitting bio-oxidation. The second is of surface bio-oxidation and the third is that the pyrite crystal is seriously oxidized and corroded by bacterium and finally broken. The bio-oxidation intensity of pyrite crystal faces is ranked as (111)>(110)>(100).