A simulation experimental study on oxidative kinetics of sphalerite under hypergene condition

查看全文 作　　者：PAN [1,2]Ziping;YE [2]Lin;LIU [2]Tiegeng;CHENG [2,3]Zengtao;GAO [2,3]Wei;YANG [2,3]Yulong

机构地区：[1]Geological Survey of Guizhou Province,Guiyang 550004,China;[2]State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China;[3]Graduate University of Chinese Academy of Sciences,Beijing 100039,China

出　　处：《Chinese Journal Of Geochemistry》索引2012年第31卷第4期,共8页

基　　金：supported jointly by the National Natural Science Foundation of China (Grant No. 40930425);the Science and Technology Foundation of Guizhou Province [Grant No. (2010)2229];the Geological Science Foundation of the Bureau of Geology and Mineral Exploration and Development of Guizhou Province [Grant No. (2009)18] 摘　　要：The sphalerite oxidative kinetics under hypergene condition was simulated and studied by means of a mixed flow reactor over a pH range of 1.0 7.8,and at dissolution temperatures from 20 to 55℃,ferric ion concentrations from 1.0×10-5 to 1.0×10-2 mol/L,O 2 flux of 0.5 L/min,and oxidants of ferric ion and O 2.It is indicated that with ferric ion as oxidant,the oxidation rate of sphalerite increases with increasing ferric ion concentration,temperature and decreasing pH value,and under the studied conditions,the dissolution rates of Zn and Cd are approximately identical,with the values of activation energy being 41.75 and 42.51 kJ·mol-1,respectively,suggesting that the oxidation rate of sphalerite is controlled by chemical reactions on mineral surface.However,with O 2 as oxidant,the oxidation mechanism of sphalerite varies with pH value.Oxidation rate decreases with increasing pH value when pH is lower than 5.95,whereas the increase of pH value results in an increase in oxidation rate when pH value is higher than 7.The oxidation rate of sphalerite can be expressed as:R Zn =10 1.1663 [Fe3+] 0 0.154 ·[H+] 0.2659 ·e-41.75/RT or R Cd =10 1.7292 [Fe3+] 0 0.170 ·[H+] 0.2637 ·e-42. 关键词：氧化动力学表生条件闪锌矿模拟实验三价铁离子铁离子浓度氧化速率化学反应控制

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A simulation experimental study on oxidative kinetics of sphalerite under hypergene condition

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