黄铁矿微生物浸出体系中的表面热力学和扩展DLVO理论  

Surface thermodynamics and extended DLVO theory on bio-leaching of pyrite mineral

作　　者：顾帼华[1] 锁军[1] 柳建设[1] 钟素姣[1] 

机构地区：[1]中南大学资源加工与生物学院,长沙410083

出　　处：《中国有色金属学报》2006年第8期1462-1467,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展规划资助项目(2004CB619204);高等学校优秀青年教师教学科研奖励计划资助项目(2002)

摘　　要：根据Young s方程的推导公式结合接触角的测定结果计算黄铁矿和氧化亚铁硫杆菌的表面能参数。结果表明,氧化亚铁硫杆菌的表面能明显高于黄铁矿的表面能。应用热力学计算氧化亚铁硫杆菌在黄铁矿表面吸附的自由能,发现其吸附自由能为正值,无法解释氧化亚铁硫杆菌在黄铁矿表面的吸附现象,而通过扩展DLVO理论建立的Lifshitz-van der Waals(LW)、Lewis acid-base(AB)和静电(EL)作用自由能与作用距离(d)之间的势能曲线,能够准确的预言氧化亚铁硫杆菌在黄铁矿表面的吸附现象。Surface energy parameters of pyrite mineral and Thiobacillus ferrooxidans were obtained by calculating according to deduced formula of Young＇s equation and contact angel. The results show that surface energy of Thiobacillus ferrooxidans is much higher than that of pyrite mineral. By thermodynamics approach, the interaction free energy of Thiobacillus ferrooxidans absorbed on the surface of pyrite was a positive value, which can not explain the adhesion behavior of the bacteria. However, the adhesion behavior can be exactly predicted by the potential energy graph of Lifshitz-van der Waals（LW） and Lewis acid-base（AB） and EL interfacial free energy as a function of separation distance（d）, which were established on the base of extended DLVO theory.

关 键 词：黄铁矿 氧化亚铁硫杆菌 扩展DLVO理论 表面能 

分 类 号：TD925.5[矿业工程—选矿]