Role of bacterial growth conditions and adhesion in the bioleaching of chalcopyrite by Thiobacillus ferrooxidans

被引:9
作者
Devasia, P
Natarajan, KA
Rao, GR
机构
[1] INDIAN INST SCI,DEPT MICROBIOL & CELL BIOL,BANGALORE 560012,KARNATAKA,INDIA
[2] INDIAN INST SCI,DEPT MET,BANGALORE 560012,KARNATAKA,INDIA
关键词
D O I
10.1007/BF03402724
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The role of growth conditions and adhesion of Thiobacillus ferrooxidans on the leaching of chalcopyrite was investigated. Thiobacillus ferrooxidans grown on sulfur, thiosulfate and ferrous ion substrates was used in this comparative study. Growth on sulfur, a solid substrate, requires bacterial adhesion unlike that required in the presence of soluble thiosulfate and ferrous ion in a mineral-salts medium. Solid substrate-grown cells showed higher rates of leaching than those grown in liquid media. An initial lag period noticed during leaching by solution-grown cells was absent when solid substrate-grown cells were used. Such a behavior is attributed to the presence of an inducible proteinaceous cell-surface appendage on the sulfur-grown cells. This appendage aids in bacterial adhesion onto the mineral surfaces. Such an appendage is absent in solution-grown cells, as substantiated by electrophoretic measurements. The importance of bacterial adhesion and the direct mechanism in leaching by Thiobacillus ferrooxidans are demonstrated.
引用
收藏
页码:82 / 86
页数:5
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