氯化铵焙烧回收脱锰矿泥中的稀土及其动力学

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英文篇名：Recovery of RE from Panxi Rare Earth Mud and the Kinetics of RE Chlorination with NH_4Cl Roasting 中文刊名：化工冶金 英文刊名：ENGINEERING CHEMISTRY & METALLURGY 作者：朱国才 ; 徐颖惠 ; 池汝安 ; 田君 英文作者：ZHU Guo-cai ; CHI Ru-an ; XU Ying-hut ; TIAN Jun(Institute of Nuclear Energy Technology) Tsinhua UniVersity ; Beijing 102201 ; China) 中文关键词：氯化铵 ; 氯化 ; 稀土 ; 动力学 英文关键词：ammonium chloride ; rare earth ; kinetics 出版日期：2000-01-15 机构：清华大学核能技术设计研究院!北京１０２２０１,清华大学核能技术设计研究院!北京１０２２０１,清华大学核能技术设计研究院!北京１０２２０１,清华大学核能技术设计研究院!北京１０２２０１ 年：2000 期：01 出版单位：化工冶金

摘要

攀西含稀土矿泥采用Ｎａ２ＳＯ３还原脱锰后，以ＮＨ４ＣＩ作为固体氯化剂氯化该脱锰矿泥中的稀土，水浸取回收稀土．考察了不同因素对稀土氯化的影响，同时研究了氯化过程的反应动力学．结果表明，氯化反应是界面化学反应控制的动力学类型，其动力学方程式符合界面化学反应的方程式１－（１－ａ）１／３＝ｋｔ，反应的表观活化能为４４．０ｋＪ/ｍｏｌ．
Panxi weathering mud is firstly leached by Na2SO3 to recover Mn, then the NH4CIroasting-water leaching method is applied to recover RE. The effects of temperature, roastingtime and NH4CI amount on RE recovery were determined. At the same time, the kinetics ofleaching RE in the mud was investigated. The results show that the RE chlorination is controlledby interface chemical reaction, and transition occurs from interface chemical reaction colltrolto diffusion control along with the progress of RE chlorination. The kinetic equation can berepresented as 1-(1-a)1/2=kt, and the activation energy of RE chlorination is 44.0 kJ/mol.

引文

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