化学-生物联合浸出次生硫化铜精矿的研究

A Combined Chemical and Biological Leaching Process for Secondary Copper Sulfide Concentrate

针对次生硫化铜精矿在传统火法炼铜工艺中存在的高能耗和环境污染严重等问题,以及单独生物法浸出存在的浸出周期长、浸出速度慢等缺点,创新性地提出了化学-生物联合浸出新工艺,即在生物浸出初期接种浸矿菌种的同时还加入适量化学氧化剂硫酸高铁。实验结果表明,浸出8 d,化学-生物联合浸出的铜浸出率达98.26%,比单独生物法高41.92个百分点,比单独化学氧化法高27.31个百分点。

The conventional copper smelting process for secondary copper sulfide concentrate suffers from a higher energy consumption and serious environmental pollution. In view of disadvantages of the bioleaching method with long leaching time and slow leaching velocity,a novel process combining chemical and biological leaching was proposed,in which leaching bacteria was inoculated and an appropriate amount of ferric sulfate as chemical oxidants was added into the system at an early stage of bioleaching process. The test results showed that copper leaching rate reached 98. 26%after 8 days of combined chemical and biological leaching,41.92 and 27.31 percentage point respectively higher than that by single biological leaching and chemical oxidation process.