APPLICATION OF MICROBIAL TECHNOLOGY TO MINERAL PROCESSING

The application of microbial technology to mineral processing hasbeen reviewed with respect to the bioleaching of metals fromminerals, the influence of biotreatment on flotation, the biobeneficication of nonmetallic minerals, and the biotreatment for minewaste reclamation. The application of microbial technology to mineralprocess- ing has shown the advantages of high efficiency, low en-Ergy and reagent consumption, low capital and operating Costs, andlow pollution of the environment.

Silver-catalyzed bioleaching for raw low-grade copper sulphide ores

This research was conducted to investigate the biooxidation and copper dissolution from raw low-grade refractory copper sulphide ores located in the Xinjiang Autonomous Region of China using adapted Thiobacillus ferrooxidans bacteria.In order to accelerate the bioleach-ing rate,the adapted mixed bacteria and silver ion catalyst were tested in the leach columns at laboratory scale.The overall acid consumption was 4.3kg sulphuric acid per kg of dissolved copper and was linearly related to the percent copper dissolution.The calculated copper dissolution rates obey the Shrinking Core Model.The relative activation energy of the whole biooxidative leaching stages was calculated to be 48.58kJ/mol.

一株氧化硫硫杆菌的分离鉴定及其沥滤污泥研究

从山西某煤矿的酸性矿井水中分离得到嗜酸氧化硫硫杆菌Tt-1,对其形态、生理生化特性、16S rDNA基因序列、生长特性及对城市污泥的沥滤效果进行了研究。Tt-1的菌细胞呈短杆状,革兰氏染色为阴性,不产生芽孢,16S rDNA系统学分析证明其为嗜酸氧化硫硫杆菌。菌株Tt-1的最佳生长条件:温度为28℃,pH值为4.0,接种量为10%,S0浓度为10 g/L。菌株Tt-1在污泥浓度为10%、28℃的条件下沥滤15 d,对污泥中Cd、Cr、Cu、Ni、Pb和Zn的最大去除率分别为66.20%、41.35%、91.74%、65.73%、43.86%和93.72%,处理后污泥中的重金属含量可满足污泥农用标准。