Thiobacillus ferrooxidans (BK-3)による銅浸出条件

概要

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The bacterial leaching of copper from low-grade copper sulfide ores was investigated using a pure strain of Thiobacillus ferrooxidans BK-3 isolated from acid mine water is Tsuchihata mine. The effects of conditions such as temperature, aeration, inoculum density, pH and dissolved iron content were studied on copper leaching rate and in some cases on final copper concentration in solution. The copper leachability of strain BK-3 was about twice that of chemical reagents, sulfuric acid and ferric sulfate. The copper yield increased with temperature up to 40℃, while the optimum for cell growth was around 30℃. The effect of aeration on copper leaching was less than on cell growth. Inoculation in the range from 10^6 to 10^7 cells/ml resulted in favorable effect on copper leaching rate. The pH control at 3.0 or 3.5 gave an increase of copper leaching and a decrease of iron dissolution.On the basis of these experiments, it was assumed that the copper leaching reaction displayed parabolic kinetic pattern, although the possible corelation between leaching rate and bacterial growth rate remained for further study.
社団法人日本生物工学会の論文
1977-01-25