Triton X-100对氧化亚铁硫杆菌氧化活性及浸出黄铜矿的影响

Effects of Triton X-100 on Oxidative Activity of Acidithiobacillus ferrooxidans and on Chalcopyrite Bioleaching

为提高黄铜矿的微生物浸出效果,研究了非离子表面活性剂Triton X-100对氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans)氧化Fe2+和S0的活性以及浸出黄铜矿的影响,并采用XRD对浸出后的产物进行了表征.结果表明,Triton X-100对氧化亚铁硫杆菌氧化Fe2+有一定的抑制作用,而对氧化S0则显现出促进作用;Triton X-100可显著改善黄铜矿的微生物浸出效果,当其质量浓度为30 mg·L-1时,黄铜矿中铜的浸出率提高了52.15%.Triton X-100的加入提高了氧化亚铁硫杆菌对黄铜矿浸出过程中间产物硫的生物利用性和消解作用,从而提高了浸出体系中细菌浓度和Fe3+浓度,进而促进了黄铜矿的溶解.

Triton X - 100 was used to improve the bioleaching of chalcopyrite with Acidithiobacillus ferrooxidans, and its effects on ferrous and sulfur oxidative activities of At. ferrooxidans and bioleaching of chalcopyrite were investigated. Chalcopyrite after bioleaching was characterized by XRD. Results showed that the addition of Triton X - 100 has little negative effect on ferrous-oxidizing activity of At. ferrooxidans, but it is favorable for that of sulfur. The copper extraction yield of chalcopyrite with 30 mg.L-~ Triton X -100 increases by 52. 15 % compared with the bioleaching without Triton X - 100. The elemental sulfur produced during bioleaching of chalcopyrite is efficiently hio-oxidized and dissolved by At. ferrooxidans in the presence of Triton X- 100, consequently increasing concentrations of the bacteria and ferric ion in bioleaching system, thus enhancing the oxidation and dissolution of chalcopyrite.