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溫度對浸礦微生物活性及銅浸出率的影響

Effect of temperature on the activity of mineral-bioleaching microorganisms and the bioleaching rate of copper

  • 摘要: 研究了從紫金山銅礦生物堆浸礦堆中分離出來的浸礦菌群在不同溫度下的氧化活性和對紫金山硫化銅礦石的浸出規律,并利用變性梯度凝膠電泳法研究了15℃和30℃的菌群組成情況.結果表明:所分離的細菌的最佳生長溫度為30℃,浸出10d,銅浸出率為87.62%,在最佳生長溫度以外銅浸出率都會降低;15℃和30℃的優勢菌分別為Leptospirillum fer-riphilumAcidithiobacillus thiooxidans,兩個溫度下均有同一種劣勢菌Acidithiobacillus caldus;優勢菌種隨溫度的變化是與菌種的性質相關的.

     

    Abstract: Bioleaching test of Ziiinshan copper sulfide ore in a shake flask was conducted at different temperatures. Bacteria culture from Zijinshan copper mine bioheap was applied in this test. The highest copper leaching rate of 87.62 % in 10 d was achieved at 30 ℃. Microbial community at 15 ℃ and 30 ℃ was analyzed by denaturing gradient gel electrophoresis. The dominant bacteria groups at 15℃ and 30 ℃ are Leptospirillum ferriphilum and Acidithiobacillus thiooxidans respectively, together with Acidithiobacillus caldus accounting high proportion at both the temperatures. The change in microbial community with temperature is correlated with its characteristics.

     

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