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.
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.
参考文献
[1] | 温建康,阮仁满,周峨,张明明,王淀佐.蓝辉铜矿的细菌氧化浸出研究[J].稀有金属,2007(06):818-823. |
[2] | 王淀佐,李宏煦,阮仁满.硫化矿的生物冶金及其研究进展[J].矿冶,2002(z1):8-12,59. |
[3] | 柳建设,邱冠周,王淀佐.硫化矿物细菌浸出机理探讨[J].湿法冶金,1997(03):1. |
[4] | Helmut Tributsch .Direct versus indirect bioleaching[J].Hydrometallurgy,2001(2/3):177-185. |
[5] | Nemati M;Webb C .A kinetic model for biological oxidation offerrous ion by thiobacillus ferrooxidans[J].Biotechnology and Bioengineering,1997,4:478. |
[6] | Boon M;Heijnen J J .Gas-liquid mass transfer phenomena in bio-oxidation experiments of sulphide minerals:A critical review of literature data[J].HYDROMETALLURGY,1998,48:187. |
[7] | 温建康,阮仁满,陈景河,吴健辉.紫金山铜矿生物堆浸提铜酸铁平衡工艺研究[J].稀有金属,2006(05):661-665. |
[8] | Leathy M J;Davidson M R;Schwarz M P .A model for heap bioleaching of chalcocite with heat balance:Bacterial temperature dependence[J].Minerials Engineering,2005,18:1239. |
[9] | 刘美林,阮仁满,温建康,王淀佐.细菌对铜矿生物浸出液粘度的影响研究[J].稀有金属,2007(05):677-681. |
[10] | 杨显万;沈庆峰;郭玉霞.微生物湿法冶金[M].北京:冶金工业出版社,2003:133. |
[11] | 柳建设,邱冠周,王淀佐.硫化矿物细菌浸出机理探讨[J].湿法冶金,1997(03):1. |
[12] | LIU Meilin,RUAN Renman,WEN Jiankang,WANG Dianzuo.Thermodynamic properties of bioleaching liquid mixtures with and without mesophilic bacteria at different temperatures[J].稀有金属(英文版),2007(06):528-535. |
[13] | Liu Xingyu;Shu Rongbo;Chen Bowei .Bacterial community structure change during pyrite bioleaching process: Effect of pH and aeration[J].Hydrometallurgy,2009(3/4):267-272. |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%