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Phases in Pyrite Bio-Oxidation Process

Jiang Lei~(1,2) Zhou Huaiyang~2 Peng Xiaotong~2 1.Wuhan University of Science & Engineering; 2.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences  
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 accelera- ting 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,phaseⅠ(inorganic oxidation of pyrite),phaseⅡ(bio-oxi- dation of Fe~(2+))and phaseⅢ(equilibrium bio-oxidation of pyrite).
【Fund】: 国家自然科学基金项目(编号:40403004,40473032)
【CateGory Index】: TD951
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