黄铁矿生物氧化过程的阶段性  

Phases in Pyrite Bio-Oxidation Process

作　　者：蒋磊[1] 周怀阳[2] 彭晓彤[2] 

机构地区：[1]武汉科技学院 [2]中国科学院广州地球化学研究所

出　　处：《金属矿山》2007年第10期59-63,共5页Metal Mine

基　　金：国家自然科学基金项目(编号:40403004;40473032)

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Eh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Eh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。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）.

关 键 词：黄铁矿 氧化亚铁硫杆菌 生物氧化 阶段性 

分 类 号：TD953[矿业工程—选矿]