Role of minerals properties on leaching process of weathered crust elution-deposited rare earth ore
来源期刊：JOURNAL OF RARE EARTHS2015年第5期
论文作者：肖燕飞 刘向生 冯宗玉 黄小卫 黄莉 陈迎迎 吴文远
文章页码：545 - 552
摘 要：Granite belonged to intrusive rock and volcanic was extrusive rock. There may be many differences in their degree of weathering and mineral chemical composition. The present study investigated the minerals properties and the leaching mechanism of the granitic weathered crust elution-deposited rare earth ore from Longnan Rare Earth Mine area（LN ores） and volcanic weathered crust elution-deposited rare earth ore from Liutang Rare Earth Mine area（LT ores）. The X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FT-IR） were used to characterize the phase of rare earth ores. The particle size distributions and main composition of the ore were also presented in this paper. The leaching mechanisms of two kinds of rare earth ores were analyzed with different kinetics models and could be described by the shrinking-core model. They were all inner diffusion-controlled leaching processes. The leaching equation of the kinetics of the LN ores could be expressed as: 1-2/3ηLN-（1-ηLN）2/3=0.106r0-0.377e-10096x106/8.314Tt,, leaching equation of kinetics of LT ores was 1-2/3ηLT-（1-ηLT）2/3=8033x10-3r0-0.411e40640x103/80314Tt 3LT LT4.640 102/3 0.4118.31403231（1）=8.33 10T. The rare earth leaching rate of LT ores was always lower in the same condition, and it would need more time and more（NH4）2SO4 consumption to achieve the same rare earth leaching efficiency, which would lead to more serious ammonia-nitrogen pollution. Therefore, magnesium salt was proposed as the leaching agent to eliminate ammonia-nitrogen pollution and further studies would be taken in the future.
肖燕飞1，刘向生1,2，冯宗玉1,2，黄小卫1,2，黄莉1,2，陈迎迎3，吴文远4
1. National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals2. Grirem Ad-vanced Materials Co. Ltd.3. School of Chemical Engineering China University of Petroleum,Beijing4. School of Materials and Metallurgy Northeastern University
摘 要：Granite belonged to intrusive rock and volcanic was extrusive rock. There may be many differences in their degree of weathering and mineral chemical composition. The present study investigated the minerals properties and the leaching mechanism of the granitic weathered crust elution-deposited rare earth ore from Longnan Rare Earth Mine area（LN ores） and volcanic weathered crust elution-deposited rare earth ore from Liutang Rare Earth Mine area（LT ores）. The X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FT-IR） were used to characterize the phase of rare earth ores. The particle size distributions and main composition of the ore were also presented in this paper. The leaching mechanisms of two kinds of rare earth ores were analyzed with different kinetics models and could be described by the shrinking-core model. They were all inner diffusion-controlled leaching processes. The leaching equation of the kinetics of the LN ores could be expressed as: 1-2/3ηLN-（1-ηLN）2/3=0.106r0-0.377e-10096x106/8.314Tt,, leaching equation of kinetics of LT ores was 1-2/3ηLT-（1-ηLT）2/3=8033x10-3r0-0.411e40640x103/80314Tt 3LT LT4.640 102/3 0.4118.31403231（1）=8.33 10T. The rare earth leaching rate of LT ores was always lower in the same condition, and it would need more time and more（NH4）2SO4 consumption to achieve the same rare earth leaching efficiency, which would lead to more serious ammonia-nitrogen pollution. Therefore, magnesium salt was proposed as the leaching agent to eliminate ammonia-nitrogen pollution and further studies would be taken in the future.
关键词：
