摘要
为了研究矿物与细菌相互作用后矿物的Zeta电位与细菌对矿物的氧化能力之间的关系,利用Zeta电位仪检测与细菌作用前后硫化矿的Zeta电位,根据Zeta电位和IEP(Iso Electric Point)的变化,判断细菌对硫化矿的氧化作用及其程度。结果表明,硫化铜矿与细菌作用后,矿物的Zeta电位降低,辉铜矿、斑铜矿和铜蓝的IEP向铜的氢氧化物方向移动,而黄铜矿向细菌的IEP方向靠近,分析原因主要是由于各矿物被细菌氧化的程度不同。对与细菌相互作用后的铜蓝进行XPS测试结果证实其表面被氧化。研究证实了细菌对硫化矿的直接氧化作用,同时也得出不同硫化铜的细菌氧化顺序:辉铜矿>斑铜矿>铜蓝>黄铜矿。
The direct bacterial oxidation of sulphide minerals was evaluated by Zeta potential and the iso- electric point （IEP）. The results show that copper sulphide minerals have been directly oxidized by the bacteria, after conditioning with Acidithiobacillus ferrooxidans, the Zeta potential of copper sulphide de- creased and became negative, the IEP of chalcoeite, bornite and covellite moved towards the IEP of cop- per hydroxide, however, the IEP of chalcopyrite was very close to that of bacteria. The XPS of covellite after conditioning with bacteria indicates the surface was oxidized. The results support the direct mecha- nism of sulphide minerals bio-oxidation from a new viewpoint. The following order for the bio-oxidation of these minerals is obtained ~ chalcocite 〉 bornite 〉 covellite 〉 chalcoovrite.
出处
《西南科技大学学报》
CAS
2012年第4期69-74,共6页
Journal of Southwest University of Science and Technology
基金
西南科技大学科研基金资助成果(编号:12zx7113)
关键词
ZETA电位
细菌
直接氧化作用
硫化铜矿
等电点(IEP)
Zeta potential
Bacteria
Direct bacterial oxidation
Copper sulphide minerals
Iso ElectricPoint （IEP）
