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《Acta Mineralogica Sinica》 2007-01
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PRELIMINARY STUDY ON BIO-OXIDATION OF PYRITE BY Acidithiobacillus ferrooxidans

JIANG Lei,ZHOU Huai-yang,PENG Xiao-tong (Ocean Research Center,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China)  
The strain of Acidithiobacillus ferrooxidans was used to study the bio-oxidation mechanism of pyrite in laboratory.A series of experiments were designed to compare differences between chemical oxidation and bio-oxidation of pyrite.Changes in concentrations of total iron in the solution during the experiment were monitored and the change of the pyrite surface was also investigated by means of a scanning electron microscope(SEM).The results showed that the chemical oxidation velocity of pyrite was very low and the presence of bacteria obviously quickened the leaching of pyrite.The SEM image showed that the chemical oxidation focused on the edge of pyrite crystal.However,a large number of erosion pits with certain orientations appeared on the crystal face of pyrite in the bio-oxidation environment.These erosion pits or micro-perforations which were arranged regularly are similar to the bacterium in shape and length,indicating that the adherence of cells to mineral surfaces existed during bio-oxidation of pyrite and cell adherence is not randomin direction.
【Fund】: 国家自然科学基金项目(批准号:40403004;40473032)
【CateGory Index】: TD951
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