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›› 2007, Vol. 7 ›› Issue (5): 973-978.

• 过程与工艺 • 上一篇    下一篇

铜蓝的细菌氧化浸出

温建康,阮仁满,周峨,张明明,王淀佐   

  1. 北京有色金属研究总院生物冶金国家工程实验室
  • 出版日期:2007-10-20 发布日期:2007-10-20

Bioleaching of Covellite Concentrate and Process Enhancement

WEN Jan-kang,RUAN Ren-mang,ZHOU E,ZHANG Ming-ming,WANG Dian-zuo   

  1. National Engineering Lab. of Biohydrometallurgy, General Research Institute for Nonferrous Metals
  • Online:2007-10-20 Published:2007-10-20

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摘要： 研究了福建紫金山铜矿中主要目的矿物之一铜蓝的细菌浸出过程的影响因素，考察了铜蓝纯矿物的浸出特性. 实验室条件下细菌浸出铜蓝纯矿物的适宜条件为：接种量100%，矿浆浓度<5%，初始Fe2+浓度4.0 g/L. 20 d浸出周期内铜蓝浸出率可达60%以上. 通过向纯矿物浸出体系中添加Fe3+、黄铁矿和H2O2，探讨提高溶液氧化电位以强化浸出效果的可能性. 结果表明，添加Fe3+和H2O2对于提高溶液的氧化性效果不显著，同时影响细菌的浸出. 添加黄铁矿则能有效提高浸出过程的氧化电位，以1:2或1:1质量比添加黄铁矿能明显加快铜蓝的细菌浸出速率.

关键词: 硫化铜矿, 细菌浸出, 铜蓝, 紫金山铜矿

Abstract: The influential factors of bioleaching of covellite concentrate collected from Zijinshan copper ore in Fujian Province with bacteria were investigated. As a result, the optimal influential parameters of bioleaching process were determined, which are concentration of inoculum 100%, pulp density less than 5%, and initial Fe2+ concentration 4.0 g/L. Within 20 d, the copper recovery rate reached 60%. In order to enhance the redox potential (Eh) level in the bioleaching process, several efforts such as the additions of Fe3+, pyrite and hydrogen peroxide were attempted in the experiments. The results show that the optimal choice to increase Eh level is the addition of pure pyrite. This condition can effectively raise the Eh of bioleaching process while the impact of environmental change is negligible. It can quicken the leaching process and enhance the final copper recovery through the addition of pyrite by 1:1 or 1:2 mass ratio of covellite concentrate to pyrite.

Key words: copper sulfide mineral, bioleaching, covellite, Zijinshan copper ore