含银固体废弃物催化黄铜矿微生物浸出研究

摘要

With sliver⁃containing solid wastes as catalyst, bioleaching of chalcopyrite with leptospirillus and ferriphilum was investigated and concentrations of cupric ion, redox potential and phase transformation of leach residue were analyzed. It is found that leaching rate of copper from chalcopyrite before the addition of silver⁃containing solid wastes was just 30%, which increased maximum to 80% after the addition. At the elementary stage of leaching, the silver⁃containing solid wastes could improve the leaching rate of copper. However, the further copper leaching at the middle stage was promoted by regulating and controlling the redox potential. X⁃ray diffraction results of leach residue showed that a large amount of elemental sulfur and jarosite generated during the leaching process, which, however, could not hinder the copper leaching from chalcopyrite after the addition of silver⁃containing solid wastes.%以含银固体废弃物为催化剂，采用氧化亚铁钩端螺旋菌浸出黄铜矿，分析了浸出液中铜离子浓度、体系氧化还原电位及浸出渣的物相变化。结果表明，未添加含银固体废弃物体系中，黄铜矿中铜浸出率仅为30％，而添加含银固体废弃物的体系中，铜浸出率均高于30％，最高达到80％。浸出前期，含银固体废弃物使铜浸出速率显著提升，而中期则是通过调控体系电位促使铜进一步浸出。浸渣X射线衍射结果表明，浸出过程中有大量的元素硫与黄钾铁矾生成，但这并未阻碍添加含银固体废弃物体系中黄铜矿的浸出。