Bio-dissolution of pyrite by Phanerochaete chrysosporium  

黄孢原毛平革菌对黄铁矿的溶解作用（英文）

作　　者：Hong-ying YANG Qian LIU Guo-bao CHEN Lin-lin TONG Auwalu ALI 杨洪英;刘倩;陈国宝;佟琳琳;Auwalu ALI(东北大学冶金学院,沈阳110819;上海第二工业大学上海电子废弃物资源化协同创新中心,上海201209)

机构地区：[1]School of Metallurgy,Northeastern University,Shenyang 110819,China [2]Shanghai Collaborative Innovation Centre for WEEE Recycling,Shanghai Polytechnic University,Shanghai 201209,China

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第4期766-774,共9页中国有色金属学报（英文版）

基　　金：Project(U1608254)supported by the National Natural Science Foundation of China

摘　　要：The dissolution of pyrite was studied with Phanerochaete chrysosporium(P.chrysosporium).This fungus resulted in the dissolution of 18%iron and 33%sulfur.The oxidization layer was formed on the pyrite surface,which probably consisted of iron oxide,iron oxy-hydroxide,iron sulfate,elemental sulfur and mycelia.The electrochemical characteristics of pyrite were studied in the systems without and with P.chrysosporium.P.chrysosporium could accelerate the dissolution of pyrite by decreasing pitting potential and polarization resistance plus improving polarization current,corrosion potential and corrosion current density.The dissolution of pyrite is the combined effect of enzymes,hydrogen peroxide,ferric iron and organic acids.Enzymes attack the chemical bonds by free radicals.Organic acids dissolve pyrite by acidolysis and complexolysis.Enzymes and hydrogen peroxide play an essential role in this process.研究黄孢原毛平革菌(Phanerochaete chrysosporium)对黄铁矿的溶解。经该菌作用后,黄铁矿中铁和硫的溶解量分别为18%和33%。在黄铁矿表面形成的氧化层可能由铁的氧化物、FeOOH、硫酸铁、元素硫及菌丝体组成。研究黄铁矿在无菌和有菌体系的电化学特征。P.chrysosporium通过降低点蚀电位和极化电阻,提高极化电流、腐蚀电位和腐蚀电流密度的方式促进黄铁矿溶解。Phanerochaete chrysosporium对硫化物的溶解是酶、H_2O_2、Fe^(3+)和有机酸联合作用的结果。酶通过自由基攻击化学键,有机酸通过酸解和络合作用溶解黄铁矿。酶和H_2O_2在黄铁矿溶解过程中发挥了重要作用。

关 键 词：Phanerochaete chrysosporium PYRITE bio-dissolution Carlin-type gold ores ELECTROCHEMISTRY 

分 类 号：TF18[冶金工程—冶金物理化学]