摘要
为了回收四川某铜矿浮选尾矿中的铜和锌,以In-bac为浸矿菌种,进行微生物浸出。考察了接种量、矿浆浓度、初始Fe^(2+)浓度、浮选药剂(T-207和H-406)等因素对浸出效果的影响。结果表明,采用两阶段微生物浸出工艺,尾矿中铜、锌浸出效果较好,第一阶段微生物浸出最佳条件为:接种量10%、矿浆浓度80 g/L、初始Fe2+浓度1.5 g/L,尾矿中铜离子和锌离子浸出率分别为21.67%和79.67%,此浸渣再次调浆后,采用改进型无铁9K培养基,无接种细菌微生物浸出,当初始pH值为2.0、矿浆浓度为80 g/L、初始Fe^(2+)浓度为0 g/L,尾矿中铜浸出率达到36.97%,锌浸出率为92.37%,浸出率分别提高了15.30个百分点和12.70个百分点。浮选药剂T-207和H-406均对尾矿微生物浸出有不利影响。
In order to recover copper and zinc from flotation tailings in a Sichun copper plant, test was conducted on biofeaching of sulphides with In- bac. The effects of amount of inoculum,pulp density,initial concentration of Fe2＋ and flotation reagents （T-207 and H-406 ） on biofeaching of tailings were investigated. Results showed that two-stage biofeaching process led to better leaching rates lor both copper and zinc. In the first stage,the extraction rates of copper and zinc from tailings were 21.67% and 79.67%, respectively,with the amount of inoculum at 10% ,pulp density at 80 g/L and initial concentration of Fe2＋ at 1.5 g/L. In the second stage, the obtained residue was biofeached with no bacteria inoculated to the biofeaching system,with an initial pH value at 2.0,pulp density at 80 g/L, initial concentration of Fe2＋ at 0 g/L,resulting in the leaching rates of copper and zinc from tailings reaching 36. 97% and 92.37%, respectively,up by 15.30 and 12.70 percentage points. It is found that flotation reagents, T-207 and H-406, have negative effects on the biofeaching of copper and zinc sulphides from a low-grade tailings.
出处
《矿冶工程》
CSCD
北大核心
2017年第1期81-84,88,共5页
Mining and Metallurgical Engineering
基金
四川省教育厅科研项目(16ZA0143)
固体废物处理与资源化教育部重点实验室资助课题(13zxgk07)
关键词
尾矿
铜
锌
硫化物
生物浸出
tailings
copper
zinc
sulphide
bioleaching
