西南科技大学学报
西南科技大學學報
서남과기대학학보
JOURNAL OF SOUTHWEST CHINA INSTITUTE OF TECHNOLOGY
2012年
4期
69-74
,共6页
Zeta电位%细菌%直接氧化作用%硫化铜矿%等电点(IEP)
Zeta電位%細菌%直接氧化作用%硫化銅礦%等電點(IEP)
Zeta전위%세균%직접양화작용%류화동광%등전점(IEP)
Zeta potential%Bacteria%Direct bacterial oxidation%Copper sulphide minerals%Iso ElectricPoint (IEP)
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。
為瞭研究礦物與細菌相互作用後礦物的Zeta電位與細菌對礦物的氧化能力之間的關繫,利用Zeta電位儀檢測與細菌作用前後硫化礦的Zeta電位,根據Zeta電位和IEP(Iso Electric Point)的變化,判斷細菌對硫化礦的氧化作用及其程度。結果錶明,硫化銅礦與細菌作用後,礦物的Zeta電位降低,輝銅礦、斑銅礦和銅藍的IEP嚮銅的氫氧化物方嚮移動,而黃銅礦嚮細菌的IEP方嚮靠近,分析原因主要是由于各礦物被細菌氧化的程度不同。對與細菌相互作用後的銅藍進行XPS測試結果證實其錶麵被氧化。研究證實瞭細菌對硫化礦的直接氧化作用,同時也得齣不同硫化銅的細菌氧化順序:輝銅礦〉斑銅礦〉銅藍〉黃銅礦。
위료연구광물여세균상호작용후광물적Zeta전위여세균대광물적양화능력지간적관계,이용Zeta전위의검측여세균작용전후류화광적Zeta전위,근거Zeta전위화IEP(Iso Electric Point)적변화,판단세균대류화광적양화작용급기정도。결과표명,류화동광여세균작용후,광물적Zeta전위강저,휘동광、반동광화동람적IEP향동적경양화물방향이동,이황동광향세균적IEP방향고근,분석원인주요시유우각광물피세균양화적정도불동。대여세균상호작용후적동람진행XPS측시결과증실기표면피양화。연구증실료세균대류화광적직접양화작용,동시야득출불동류화동적세균양화순서:휘동광〉반동광〉동람〉황동광。
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.