Thermodynamic properties of bioleaching liquid mixtures with and without mesophilic bacteria at different temperatures

查看全文 作　　者：LIU Meilin RUAN Renman WEN Jiankang WANG [1]Dianzuo

机构地区：[1]National Engineering Laboratory of Biohydrometallurgy, General Research Institute for Non-Ferrous Metals, Beijing 100088, China

出　　处：《Rare Metals》索引2007年第26卷第6期,共8页

基　　金：the National Basic Research Program of China (No. 2004CB619206). 摘　　要：In this work,low-grade copper sulfide mine has been treated by the bioleaching process using native cultures of Acidithiobacillus ferrooxidans. The bioleaching experiments were carried out in shake flasks at pH 2.0, 180 r·min-1 and 30°C for mesophilic bacteria. The conductivity of copper bioleaching liquid was determined by the electric conductivity method at temperatures ranging from 298 K to 313 K. The ionic activity coefficients were estimated using Debye-Hcker and Osager-Falkenlagen equations. Meanwhile, the effects of temperature and concentration on the mean ionic activity coefficients were discussed. The relative partial molar free energies, enthalpies and entropies of copper leaching solution at above experimental temperatures were calculated. The behaviors of change of relative partial molar quantities were discussed on the basis of electrolytic solution theory. Simultaneously, the thermodynamic characters of bioleaching solution with and without mesophilic bacteria were compared. The existence of mesophilic bacteria changed the Fe3+/Fe2+ ratio, which resulted in the difference of ionic interaction. The experimental data show that the determination of the thermodynamic properties during the bioleaching processes should be important. 关键词：活性系数热力学性质生物浸取嗜温性细菌

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Thermodynamic properties of bioleaching liquid mixtures with and without mesophilic bacteria at different temperatures

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