Faculty of Resource and Environment Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.
Bioresour Technol. 2012 Apr;110:462-7. doi: 10.1016/j.biortech.2012.01.084. Epub 2012 Jan 28.
The influence of sodium chloride on dissolution of chalcopyrite and surface sulfur speciation during bioleaching of chalcopyrite with the extreme thermophile Acidianus manzaensis YN-25 was studied. The addition of sodium chloride accelerated the dissolution of chalcopyrite by reducing the accumulation of elemental sulfur layers on the mineral surface, resulting in an increase in the concentration of copper ions from 2.37g/L to 2.67g/L. Jarosite and elemental sulfur were found in the bioleached residues, while the amount of elemental sulfur accumulating on the mineral surface decreased drastically from 25.4% to 3.0% when 0.66g/L of sodium chloride was present during bioleaching. Therefore, the accumulation of elemental sulfur on the mineral surface is likely mainly responsible for the slowdown in the dissolution rate. The results indicated that bioleaching chalcopyrite with extreme thermophiles possessing high sulfur oxidation activity likely enhances dissolution of chalcopyrite by effectively removing elemental sulfur accumulating on the mineral surface.
研究了极端嗜热菌 Acidianus manzaensis YN-25 生物浸矿过程中氯化钠对黄铜矿溶解和表面硫形态的影响。添加氯化钠通过减少元素硫层在矿物表面的积累加速了黄铜矿的溶解，导致铜离子浓度从 2.37g/L 增加到 2.67g/L。生物浸出残渣中发现了铁矾和元素硫，而当生物浸矿过程中存在 0.66g/L 的氯化钠时，矿物表面积累的元素硫量从 25.4%急剧减少到 3.0%。因此，元素硫在矿物表面的积累很可能是导致溶解速率减缓的主要原因。结果表明，具有高硫氧化活性的极端嗜热菌生物浸矿可能通过有效去除矿物表面积累的元素硫来增强黄铜矿的溶解。
