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中文摘要：
以氧化亚铁硫杆菌为实验菌株，研究了黄铁矿的Fe^3＋氧化和生物氧化过程中溶液铁离子浓度、pH值以及肌值的变化。结果表明，Fe^3＋由于自身很快会被消耗，因而对黄铁矿的氧化速率较低；而在细菌的作用下，Fe^2＋可以不断被氧化成Fe^3＋，从而使黄铁矿的氧化速率明显加快，因此生物氧化具有更高的效率。基于间接作用机制，结合黄铁矿生物氧化过程中pH值及肌值的变化规律，提出了黄铁矿生物氧化的阶段性特点，即将氧化亚铁硫杆菌对黄铁矿的氧化过程分为黄铁矿无机氧化、Fe^2＋生物氧化和黄铁矿稳定生物氧化3个阶段。
英文摘要：
The change in the iron ion concentration, pH and Eh in the Fe^3 ＋ oxidization and bio-oxidation process of pyrite is studied by using Acidithiobacillus ferrooxidans. The results show that as Fe^3 ＋ will rapidly be consumed, it has a low oxidation rate for pyrite while the presence of bacteria can continuously oxidize Fe^2＋ into Fe^3 ＋ , thus evidently accelerating the pyrite oxidation rate. Therefore, bio-oxidation has higher efficiency. Based on the indirect function mechanism and in light of the change law of pH and Eh in the bio-oxidation process of pyrite, it is suggested that the phase characteristics of pyrite bio-leaching can be divided into three phases, namely, phase Ⅰ （ inorganic oxidation of pyrite）, phase Ⅱ （ bio-oxidation of Fe^2＋ ） and phase Ⅲ（ equilibrium bio-oxidation of pyrite）.
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