CAJ | 학술논문

通过分析黄铜矿表面接触角、Zeta 电位和表面形貌变化，研究嗜热硫氧化硫杆菌(Sulfobacillus thermosulfidooxidans，S.t菌)和氧化亚铁钩端螺旋菌(Leptospirillum ferrooxidans，L.f菌)对黄铜矿表面性质的影响。结果表明，细菌培养基(9K培养基)对黄铜矿表面性质无明显影响，接触角稳定在黄铜矿表面接触角48°左右。两种细菌对黄铜矿表面性质影响规律相似，采用细菌摇瓶浸出时，振动条件下，矿物表面的亲水性随浸出过程逐渐增强；而在静置细菌浸出过程中，浸出初期黄铜矿表面疏水性变强，之后随浸出时间的延长黄铜矿表面的亲水性增强，推测可能是由于浸出前期黄铜矿表面生成疏水硫化物和元素硫，后期被进一步氧化分解。不同细菌作用后，黄铜矿的等电点接近细菌的等电点，说明两种细菌均能有效地吸附在黄铜矿表面。通过原子力显微镜(AFM)观察发现，黄铜矿经细菌浸出后，表面不同程度地被腐蚀，并且随着浸出时间的延长，表面腐蚀程度加剧，其中S.t菌对黄铜矿的腐蚀作用较L.f菌更强。
통과분석황동광표면접촉각、Zeta 전위화표면형모변화，연구기열류양화류간균(Sulfobacillus thermosulfidooxidans，S.t균)화양화아철구단라선균(Leptospirillum ferrooxidans，L.f균)대황동광표면성질적영향。결과표명，세균배양기(9K배양기)대황동광표면성질무명현영향，접촉각은정재황동광표면접촉각48°좌우。량충세균대황동광표면성질영향규률상사，채용세균요병침출시，진동조건하，광물표면적친수성수침출과정축점증강；이재정치세균침출과정중，침출초기황동광표면소수성변강，지후수침출시간적연장황동광표면적친수성증강，추측가능시유우침출전기황동광표면생성소수류화물화원소류，후기피진일보양화분해。불동세균작용후，황동광적등전점접근세균적등전점，설명량충세균균능유효지흡부재황동광표면。통과원자력현미경(AFM)관찰발현，황동광경세균침출후，표면불동정도지피부식，병차수착침출시간적연장，표면부식정도가극，기중S.t균대황동광적부식작용교L.f균경강。
The effects of Sulfobacillus thermosulfidooxidans and Leptospirillum ferrooxidans on the surface properties of chalcopyrite were investigated by analyzing the contact angle, Zeta-potential and surface morphology changes. The results show that the culture medium (9K medium) has no distinct effect on the chalcopyrite surface properties, the contact angles keep at about 48°. The hydrophilcity of chalcopyrite surface increases during bioleaching in shake flask under vibration condition, while in bioleaching under stationary condition, the surface hydrophobicity of chalcopyrite increases in the initial stage as the formation of hydrophobic substances like elemental sulphur and secondary Cu-Fe-S intermediate species, and then decreases as further oxidation. The isoelectric point of chalcopyrite in the presence of bacterium shifts towards the bacteria’s isoelectric point correspondingly, indicating that bacteria adsorb on the surface of chalcopyrite effectively. The erosion degree of chalcopyrite surface increases with bioleaching through observing atomic force microscope (AFM) images, and the corrosion rate in the presence of Sulfobacillus thermosulfidooxidans is higher than that in the presence of Leptospirillum ferrooxidans.