中温嗜酸硫杆菌浸出低品位硫化铜矿

研究了中温嗜酸硫杆菌的生长条件, 对黄铜矿进行了细菌浸出试验研究。研究表明, 中温嗜酸硫杆菌最适宜的生长条件为: pH值为2, 温度为30±1 ℃, 此条件下细菌浓度为2.24×10⁷个/mL。接种量、矿浆浓度对黄铜矿中铜的浸出率有显著的影响, 随着接种量的增加, 铜的浸出率提高。在相同浸出时间内, 矿浆浓度5%左右时, 黄铜矿中铜的浸出率最高。低品位硫化铜矿柱浸试验结果表明: 细菌浸出75 d, 铜的浸出率为45%。

Bioleaching of Copper Sulfide Ore by Acidithiobacillus Ferrooxidans and Acidithiobacillus Thiooxidans

The growth condition of bacteria acidithiobacillus ferrooxidans and acidithiobacillus thiooxidans was investigated and the bioleaching tests of copper sulfide ore using these bacteria were carried out. The results show that the bacteria grow best at temperature of 30±1 ℃ and pH value of  2.0, while, under this condition the number of bacteria can reach 2.24×10⁷ per milliliter. It was found that the copper extraction was significantly influenced by the bacterial inoculum amount and the pulp density. For chalcopyrite bioleaching, the leaching ratio of copper increases along with the climbing of inoculum amount, and it can reach the highest value in a pulp with a density of 5% for the same leaching duration The chalcopyrite and the residues were respectively analyzed using EDXA. It shows that, for the column bioleaching of low grade copper sulfide ore, the leaching ratio of copper reaches 45% after bioleached for 75 days.