Kinetics of iron removal from metallurgical grade silicon with pressure leaching
来源期刊：Rare Metals2011年第6期
论文作者：YU Zhanlianga, b, c, XIE Keqianga, MA Wenhuia, ZHOU Yanga, XIE Gangb, c, and DAI Yongniana a National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming , China b Technology Center of Yunnan Metallurgy Group Co., Kunming , China c Kunming Metallurgy Research Institute, Kunming , China
文章页码：688 - 694
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.
YU Zhanlianga, b, c, XIE Keqianga, MA Wenhuia, ZHOU Yanga, XIE Gangb, c, and DAI Yongniana a National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China b Technology Center of Yunnan Metallurgy Group Co., Kunming 650031, China c Kunming Metallurgy Research Institute, Kunming 650031, China
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.
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