Kinetics of iron removal from metallurgical grade silicon with pressure leaching

查看全文 作　　者：YU [1,2,3]Zhanliang;XIE [1]Keqiang;MA [1]Wenhui;ZHOU [1]Yang;XIE [2,3]Gang;DAI [1]Yongnian

机构地区：[1]National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China;[2]Technology Center of Yunnan Metallurgy Group Co., Kunming 650031, China;[3]Kunming Metallurgy Research Institute, Kunming 650031, China

出　　处：《Rare Metals》索引2011年第30卷第6期,共7页

基　　金：financially supported by the Program for New Century Excellent Talents of Ministry of Education of China (No.NCET-07-0387);the National Natural Science Foundation of China (No.51064014) 摘　　要：In this paper, the kinetics of pressure leaching for purification of metallurgical grade silicon with hydrochloric acid was investigated. The effects of particle size, temperature, total pressure, and concentration of hydrochloric acid on the kinetics and mechanism of iron removal were studied. It was found that the reaction kinetic model followed the shrinking core model, and the apparent activation energy of the leaching reaction was 46.908 kJ/mol. And the apparent reaction order of iron removal with pressure leaching was 0.899. The kinetic equation was ob-tained and the mathematical model of iron removal from metallurgical grade silicon (MG-Si) was given as follows: 1-2/3x-(1-x)2/3=exp(5.1654-4811.4591/T+1.287lnp+1.046ln[C])·t/r02· The values calculated from the equation were consistent with the experimental results. 关键词：反应动力学模型盐酸浸出冶金级除铁表观活化能硅收缩核模型动力学方程

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Kinetics of iron removal from metallurgical grade silicon with pressure leaching

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