稀土熔盐渣钙化焙烧酸浸及动力学研究
Calcification Roasting Acid Leaching and Kinetics of Rare Earth Molten Salt Slag
刘庆生 1李威 1肖浩 1刘淼 1聂华平 1邱廷省2
作者信息
- 1. 江西理工大学材料冶金化学学部,江西赣州 341000
- 2. 江西理工大学资源与环境工程学院,江西赣州 341000
- 折叠
摘要
针对目前从稀土熔盐电解渣中回收稀土效率低的问题,提出CaO焙烧转型-盐酸浸出法回收稀土.该方法系统考察了焙烧温度、焙烧时间、CaO添加量,以及HC1浓度、浸出时间、液固比、浸出温度等对渣中稀土提取效果的影响,并对焙烧过程进行动力学研究.结果表明,在焙烧温度700 ℃,焙烧时间3 h,CaO与稀土熔盐电解渣质量比0.9∶1,盐酸浓度5mol·L-1,浸出时间1.5 h,液固比15∶1,浸出温度50 ℃,浸出时间1.5 h的条件下,稀土浸出率达到99.03％.焙烧反应过程受化学反应控制,反应表观活化能E为65.46 kJ·mol-1,动力学方程为1-(1-x)1/3=exp(5.31068-7874.03289/T).
Abstract
Aiming at the problem of low efficiency of rare earth recovery from rare earth molten salt electrolysis slag,CaO roasting transformation-hydrochloric acid leaching method is proposed.This method systematically in-vestigated the effects of calcination temperature,calcination time,CaO addition,hydrochloric acid concentra-tion,leaching time,liquid-solid ratio,and leaching temperature on the extraction effect of rare earth in slag,and the kinetic calculation of the calcination process was carried out.The results show that under the conditions of roasting temperature 700 ℃,roasting time 3 h,mass ratio of CaO to rare earth molten salt electrolysis slag 0.9∶1,hydrochloric acid concentration 5 mol·L-1,leaching time 1.5 h,liquid-solid ratio 15∶1,leaching temper-ature 50 ℃ and leaching time 1.5 h,the rare earth leaching rate reaches 99.03％.The roasting process is con-trolled by chemical reaction.Activation energy of this process is 65.46 kJ·mol-1 and the kinetic equation is 1-(1-x)1/3=exp(5.31068-7874.03289/T).
关键词
稀土/熔盐电解渣/氧化钙焙烧/盐酸浸出/表观活化能Key words
rare earth/molten salt electrolysis slag/calcium oxide roasting/hydrochloric acid leaching/apparent activation energy引用本文复制引用
基金项目
"十三五"国家重点研发计划项目(2018YFC1903405)
出版年
2024
NETL
NSTL
万方数据