Key Lab of Biohydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China; School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China.
Bioresour Technol. 2013 Dec;149:71-6. doi: 10.1016/j.biortech.2013.09.035. Epub 2013 Sep 16.
Bioleaching of chalcopyrite and bornite in the presence of Acidithiobacillus ferrooxidans was carried out to investigate the influences between each other during bioleaching. Bioleaching results indicated that bornite accelerated the dissolution of chalcopyrite, and chalcopyrite also accelerated the dissolution of bornite, it could be described as a synergistic effect during bioleaching, this synergistic effect might be attributed to the galvanic effect between chalcopyrite and bornite, and to the relatively low solution potential as the addition of bornite. Significantly amount of elemental sulfur and jarosite formed on the minerals surface might be the main passivation film inhibiting the further dissolution, and the amount of elemental sulfur significantly increased with the addition of bornite. Results of electrochemical measurements indicated that the oxidation and reduction mechanisms of chalcopyrite and bornite were similar, the addition of bornite or chalcopyrite did not change the oxidative and reductive mechanisms, but increased the oxidation rate.
在嗜酸氧化亚铁硫杆菌的存在下进行黄铜矿和斑铜矿的生物浸出，以研究生物浸出过程中它们之间的相互影响。生物浸出结果表明，斑铜矿加速了黄铜矿的溶解，而黄铜矿也加速了斑铜矿的溶解，可以描述为生物浸出过程中的协同效应，这种协同效应可能归因于黄铜矿和斑铜矿之间的电偶效应，以及添加斑铜矿导致溶液电位相对较低。大量的元素硫和铁矾在矿物表面形成可能是主要的钝化膜，抑制了进一步的溶解，随着斑铜矿的添加，元素硫的量显著增加。电化学测量结果表明，黄铜矿和斑铜矿的氧化还原机制相似，添加斑铜矿或黄铜矿不会改变氧化还原机制，但会提高氧化速率。
