中等嗜热菌浸出德兴黄铜矿的试验研究

Research on the Bioleaching of Chalcopyrite from Dexing Copper Mine by Moderate Thermophiles

对中等嗜热菌在45℃下浸出德兴黄铜矿的情况进行了试验研究。结果表明,添加适量(4 g/L)的Fe2+有利于中等嗜热菌的生长和黄铜矿的浸出;中等嗜热菌活性高有利于提高黄铜矿的浸出率;在试验酸度范围内,pH=1.50时中等嗜热菌的活性最高;矿浆浓度越低、粒度越细,越有利黄铜矿的浸出。在最佳试验条件下,黄铜矿49.2 d的铜浸出率为73.32%。浸出渣的XRD分析结果揭示,在浸出一段时间后,黄铜矿慢慢发生钝化的原因在于硫单质和黄钾铁矾在其表面的附着。

The bioleaching of chalcopyrite by moderate thermophiles from Dexing Copper Mine was researched at 45℃. The experiment results showed that proper amount of Fe^2＋ （4 g/L）was helpful for the growth of bacteria and the hioleaching of ehalcopyrite. The high bacterial activity could accelerate the biuleaching of chalcopyrite, In the acidity range of test,the bacterial activity is highest in pH 1.50. Furthermore, the lower the pulp density was and the smaller the partMe size was,the more favorable the bioleaching rate was. In the best condition,the leaching rate of chalcopyrite in 45 ℃ was 73.32% in 49. 2 d. The residue of bioleaching was studied by X-ray diffraction（XRD） ,and the results demonstrated that sulfur and jarosite may be the passivation layer of chalcopyrite.