中国有色金属学报（英文版）
中國有色金屬學報（英文版）
중국유색금속학보（영문판）
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2014年
6期
1898-1904
,共7页
黄铜矿%嗜铁钩端螺旋菌%表面性质%钝化层
黃銅礦%嗜鐵鉤耑螺鏇菌%錶麵性質%鈍化層
황동광%기철구단라선균%표면성질%둔화층
chalcopyrite%Leptospirillum ferriphilum%surface properties%passivation layer
通过吸附、动电位、接触角和摇瓶浸出试验研究Leptospirillum ferriphilum菌作用前后黄铜矿表面性质的变化。采用不同能源物质(亚铁和黄铜矿粉)培养L. ferriphilum菌。结果表明，细菌可以很快吸附在黄铜矿表面，并且固体能源物质培养的细菌比液体能源物质培养的细菌可以更多、更快地吸附在矿物表面。与细菌作用后，黄铜矿的等电点朝着细菌等电点的方向移动。在添加与不添加能源物质时，黄铜矿的接触角表现出不同的变化趋势。XRD、SEM/EDS检测表明浸出过程中在黄铜矿表面生成了硫和黄钾铁矾。通过EDS检测可知在黄铜矿的分解过程中，铁优先从黄铜矿表面释放出来。在浸出过程中黄铜矿表面生成了钝化层，从而导致其浸出率很低。通过研究推测钝化层的主要成分是硫，而不是黄钾铁矾。
通過吸附、動電位、接觸角和搖瓶浸齣試驗研究Leptospirillum ferriphilum菌作用前後黃銅礦錶麵性質的變化。採用不同能源物質(亞鐵和黃銅礦粉)培養L. ferriphilum菌。結果錶明，細菌可以很快吸附在黃銅礦錶麵，併且固體能源物質培養的細菌比液體能源物質培養的細菌可以更多、更快地吸附在礦物錶麵。與細菌作用後，黃銅礦的等電點朝著細菌等電點的方嚮移動。在添加與不添加能源物質時，黃銅礦的接觸角錶現齣不同的變化趨勢。XRD、SEM/EDS檢測錶明浸齣過程中在黃銅礦錶麵生成瞭硫和黃鉀鐵礬。通過EDS檢測可知在黃銅礦的分解過程中，鐵優先從黃銅礦錶麵釋放齣來。在浸齣過程中黃銅礦錶麵生成瞭鈍化層，從而導緻其浸齣率很低。通過研究推測鈍化層的主要成分是硫，而不是黃鉀鐵礬。
통과흡부、동전위、접촉각화요병침출시험연구Leptospirillum ferriphilum균작용전후황동광표면성질적변화。채용불동능원물질(아철화황동광분)배양L. ferriphilum균。결과표명，세균가이흔쾌흡부재황동광표면，병차고체능원물질배양적세균비액체능원물질배양적세균가이경다、경쾌지흡부재광물표면。여세균작용후，황동광적등전점조착세균등전점적방향이동。재첨가여불첨가능원물질시，황동광적접촉각표현출불동적변화추세。XRD、SEM/EDS검측표명침출과정중재황동광표면생성료류화황갑철반。통과EDS검측가지재황동광적분해과정중，철우선종황동광표면석방출래。재침출과정중황동광표면생성료둔화층，종이도치기침출솔흔저。통과연구추측둔화층적주요성분시류，이불시황갑철반。
The alteration of surface properties of chalcopyrite after biological conditioning with Leptospirillum ferriphilum was studied by adsorption, zeta-potential, contact angle and bioleaching tests. The strains of L. ferriphilum cultured using different energy sources (either soluble ferrous ion or chalcopyrite) were used. The adhesion of bacteria to the chalcopyrite surface was a fast process. Additionally, the adsorption of substrate-grown bacteria was greater and faster than that of liquid-grown ones. The isoelectric point (IEP) of chalcopyrite moved toward that of pure L. ferriphilum after conditioning with bacteria. The chalcopyrite contact angle curves motioned diversely in the culture with or without energy source. The results of X-ray diffraction patterns (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analysis indicate that the surface of chalcopyrite is covered with sulfur and jarosite during the bioleaching process by L. ferriphilum. Furthermore, EDS results imply that iron phase dissolves preferentially from chalcopyrite surface during bioleaching. The copper extraction is low, resulting from the formation of a passivation layer on the surface of chalcopyrite. The major component of the passivation layer that blocked continuous copper extraction is sulfur instead of jarosite.
