Bioleaching of chalcopyrite by UV-induced mutagenized Acidiphilium cryptum and Acidithiobacillus ferrooxidans

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• 作者：Ai-ling XU ; Jin-lan XIA ; Shuai ZHANG ; Yu YANG ; Zhen-yuan NIE ; Guan-zhou QIU
• 关键词：Acidiphilium cryptum ; Acidithiobacillus ferrooxidans ; UV-induced mutagenesis ; bioleaching ; chalcopyrite
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2010
• 出版时间：February 2010
• 年：2010
• 卷：20
• 期：2
• 页码：315-321
• 全文大小：336 K

文摘

The original strains Acidithiobacillus ferrooxidans GF and Acidiphilium cryptum DX1-1 were isolated from the drainage of some caves riched in chalcopyrite in Dexing Mine in Jiangxi Province of China. The optimum temperature and pH for growth were 30°C and 3.5 for Ac. cryptum DX1-1, and 30°C and 2.0 for At. ferrooxidans GF, respectively. For Ac. cryptum DX1-1, the optimum UV radiating time was 60 s and the positive mutation rate was 22.5 % . The growth curves show that Ac. cryptum after mutagenesis reached stationary phase within 60 h, which was 20 h earlier than the original strain. For At. ferrooxidans GF, the optimum mutation time was 60 s and the positive mutation rate was 35 % . The most active UV-mutated strain At. ferrooxidans GF oxidized all the ferrous after 48 h. The bioleaching experiments showed that bioleaching with the mixture of UV-mutated strains of At. ferrooxidans GF and Ac. cryptum DX1-1(1:1) could extract 3.01 g/L of copper after 30 d, while the extracted copper was 2.63 g/L with the mixture of the original strains before UV-mutation. At the end of the bioleaching experiments, the proportion of the cell density in the cultures of Ac. cryptum DX1-1 and At. ferrooxidans GF was approximately 1:5.