低电位生物浸出黄铜矿研究

Bioleaching of Chalcopyrite at Low Redox Potential

在酸性溶液中,高浓度Fe2+离子的存在有助于溶解氧对黄铜矿的氧化浸出。试验驯化培养具有单一硫氧化性的高效浸矿细菌,运用其对单体硫的高效氧化性能,结合Fe2+离子对黄铜矿氧化浸出的促进作用,开展黄铜矿低电位生物浸出研究。研究发现硫氧化菌可有效利用黄铜矿氧化溶解的产物——单体硫,将其氧化为硫酸并补充溶液H+离子消耗。同时,清除黄铜矿表面氧化溶解产物——单体硫后,有助于离子扩散和黄铜矿的进一步氧化溶解。

In acidic medium, the presence of high concentration Fe^2＋ ions will facilitate the oxidative leaching of ehaleopyrite. A single sulfur-oxidative bacteria was separated and adapted for highly efficient ore leaching and used in the investigation of bioleaching of ehaleopyrite at low redox potential by making use of its high oxidation ability for free sulfur and Fe^2＋ iron＇role of promoting the oxidative leaching. It is found that sulfur-oxidative bacteria/can effectively make use of the product of oxidative dissolution of chalcopyrite-free sulfur to implement the H ＋ consumption in the solution by oxidizing it into sulfuric acid. Meanwhile, the removal of the free sulfur from the ehaleopyrite will facilitate the ion diffusion and the further oxidative solution of ehalcopyrite.