首页|Recovering rare earths,lithium and fluorine from rare earth molten salt electrolytic slag using sub-molten salt method

Recovering rare earths,lithium and fluorine from rare earth molten salt electrolytic slag using sub-molten salt method

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Viewing the problem of high energy consumption in the process of recovering rare earths from rare earth molten salt electrolysis slag,an environmentally friendly and low carbon process by sub-molten salt decomposition was developed.The thermodynamic analysis of sub-molten salt reaction indicates that the recovery of rare earths from the slag using sub-molten salt medium is thermodynamically feasible.In this process,the rare earth fluoride and lithium in the slag are almost transformed into rare earth hy-droxide,sodium fluoride and lithium hydroxide,fluorine and lithium are transferred into the washing solution,and the rare earths in the residues can be leached into solution by acid leaching.Under the optimum reaction conditions of reaction temperature 200 ℃,reaction time 3 h,NaOH initial concen-tration 80％,NaOH-Slag mass ratio 3:1,the leaching efficiency of rare earths,fluorine and lithium can reach to 99.05％,98.23％and 99.22％.After evaporation,the fluorine and lithium in the washing solution can be obtained in the forms of sodium fluoride and lithium fluoride,the recovery efficiency reach 95.5％and 92.8％,respectively.The RE oxides(99.53％)can be obtained from the leaching solution after pre-cipitation and roasting.

Rare earth electrolysis slagSub-molten saltGreen extractionFluorineLithiumRecovery

Delong Yang、Mingming Yu、Yusufujiang Mubula、Weiquan Yuan、Zheyu Huang、Bo Lin、Guangjun Mei、Tingsheng Qiu

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School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou,341000,China

Jiangxi Key Laboratory of Mining Engineering,Jiangxi University of Science and Technology,Ganzhou,341000,China

Gannan Institute of Science and Technology,Ganzhou,341000,China

School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan,430070,China

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National Key Research and Development ProjectJiangxi Province Graduate Student Innovation Special Fund ProjectNatural Science Foundation of Jiangxi ProvinceNatural Science Foundation of Jiangxi ProvinceYoung Elite Scientists Sponsorship Program by CASTOpen Project of Guangxi Key Laboratory of Nonferrous Metals and Characteristic Materials Processing

2018YFC190340020320080038920224BAB20403820202BAB2140142022QNRC0012022GXYSOF11

2024

10.1016/j.jre.2023.08.009

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(9)
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