高海拔地区硫化铜矿生物浸出研究

温度、 pH、 O_2及CO_2的供给是影响细菌活性的关键因素, 西藏玉龙铜矿地处高原地区, 海拔高、温度低、空气稀薄, 应用生物湿法冶金技术提铜难度较大. 对高海拔地区以次生硫化铜矿为主的硫化铜矿进行了现场生物柱浸扩大试验研究, 选育出耐寒高效浸矿细菌, 考察了不同粒度条件下该矿物的浸出特性, 分析高海拔地区生物浸出的可行性. 结果表明, 选育出的细菌耐受力强, 在极端条件下生长良好, 细菌生长最佳pH范围为1.7～2.0, 浸出体系温度高于5 ℃. 浸出5个月, 浸出过程中氧化还原电位高于800 mV(SHE)以上, 铜的浸出可达75.68%, 应用生物浸出完全可行.

Bioleaching of Copper Sulfides in High Altitude Region

Temperature, pH, O_2 and supply of CO_2 were the key influencing factors of bacterial activity, Tibet Yulong copper mining located in high altitude region with low temperature and thin air, so it was very difficult to recovery copper from sulfides by bacterium. This paper focused on the column bioleaching of secondary copper sulfides in high altitude. High efficient bacteria, which could resist low temperature, were cultivated. The leaching characteristics of the mineral were researched under various particle size conditions, and the feasibility of bioleaching copper sulfides in high altitude region was analyzed. The results showed that the cultivated bacteria had high resistance of low temperature, which could grow well under extreme conditions. The proper pH scope was between 1.7 and 2.0, and the temperature was higher than 5 ℃. After leached 5 months, the solution redox potential was above 850 mV(SHE) and the copper recovery rate was as high as 75.68%. It was completely feasible to recovery copper from sulfides in high altitude region by bioleaching.