| Mechanism of chlorinating lanthanum oxide and cerium oxide with ammonium chloride |
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| 引用本文： | 朱国才,李赋屏,肖明贵. Mechanism of chlorinating lanthanum oxide and cerium oxide with ammonium chloride[J]. 中国有色金属学会会刊, 2003, 13(6) |
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| 作者姓名： | 朱国才 李赋屏 肖明贵 |
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| 作者单位： | Institute of Nuclear Energy Technology，Institute of Earth Science and Resource，Department of Civil Engineering Tsinghua University，Beijing 102201，China，China University of Geosciences，Beijing 100083，China，Guilin Institute of Technology，Guilin 541004，China |
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| 基金项目： | Project(5 980 40 0 4,5 0274046)supportedbytheNationalNaturalScienceFoundationofChina |
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| 摘 要： | 1 INTRODUCTIONThelightrareearthoressuchasbastnasiteandBeiyuneboitearetheoneswithlanthanumandceriumelementasmaincomponent (thecontentoflan thanumandcerium >85 % (massfraction) ) .General ly ,thelightrareearthoresaredecomposedbyacidoralkali,thentherareearthproductscouldbefurtherrecovered[1,2 ] .Someshortagesexistintheconven tionalprocessofrecoveringrareearth ,suchaslongflow sheet ,multi transferringformoftherareearthandsoon .Furthermore ,thewasteacidoralkaliandgasemissionsuchasHF ,SO2 pr…
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Mechanism of chlorinating lanthanum oxide and cerium oxide with ammonium chloride |
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| ZHU Guo-cai,LI Fu-ping,XIAO Ming-gui. Mechanism of chlorinating lanthanum oxide and cerium oxide with ammonium chloride[J]. Transactions of Nonferrous Metals Society of China, 2003, 13(6) |
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| Authors: | ZHU Guo-cai LI Fu-ping XIAO Ming-gui |
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| Affiliation: | ZHU Guo-cai1,LI Fu-ping2,XIAO Ming-gui3 |
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| Abstract: | Using ammonium chloride(NH4Cl)as a chlorinating agent,the effects of chlorinating temperature,at 300℃ for 90 min,and have no advantage to chlorination of lanthanum and cerium oxides at higher temperature.The thermal decomposition of LaCl3 and CeCl3 is carried out to explore the mechanism of chlorinating lanthanum and cerium oxides.At the same time,the chlorination of lanthanum and cerium oxides is not devoted to the HCl decomposed from NH4Cl,but to NH4Cl directly taking part in the chlorination of La2O3 and CeO2.The lanthanum and cerium oxides in chlorination firstly form intermediate LaOCl and CeOCl,and then transfer to LaCl3 and CeCl3,fither prove the existence of the intermediates LaOCl and CeOCl.Therefore the chlorinating temperature and time should strictly be controlled when the lanthanum oxide and cerium oxide are chlorinated with NH4 Cl.And over-dosage of NH4 Cl should be also applied in the process of chlorination. |
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| Keywords: | lanthanum cerium mechanism chlorination thermal decomposition |
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