Application of Hydrophobic Ionic Liquid-Neutral Organophosphorus Extractant in Extraction of Rare Earth Elements

化学工业与工程

Chemcial Industry and Engineering

2020, Vol. 37

Issue (5) :22-30 DOI: 10.13353/j.issn.1004.9533.20196001

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Application of Hydrophobic Ionic Liquid-Neutral Organophosphorus Extractant in Extraction of Rare Earth Elements

Tu Shenghui^1,2, Zhang Zhiwen^1,2, Zhang Chao¹, Peng Hailong¹, Du Jun^1,2

1. School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China;
2. Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang 330047, China

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Abstract Liquid-Liquid extraction is widely used in the separation and recovery of rare earth elements. In order to facilitate phase separation, hydrophobic extracts are usually used. Based on the properties of liquid-liquid extraction, we use microwave-assisted method to synthesize hydrophobic ion liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF₆]). The extractions of Nd³⁺ and Pr³⁺ from rare earth elements by [BMIM][PF₆] with different neutral phosphorus oxygen extractants were studied. The results showed that 1-butyl-3-methylimidazolium hexafluorophosphate-trioctylphosphine oxide ([BMIM][PF₆]-TOPO) was the best extraction system. The effects of time, temperature, pH, V(A)/V(O) (rare earth ionic aqueous phase/organic phase of extraction system) and volume ratio of extracted components on extraction efficiency were studied in the best extraction system. The results showed that the extraction time was 20 min, the temperature was 25 ℃, the pH=6.0, V_{[BMIM][PF₆]}:V_TOPO=1:1, and the extraction efficiency was the best for Nd³⁺ compared with V(A)/V(O)=1. The extraction rate was 97.8%. The extraction time was 25 min, the temperature was 25 ℃, the pH=6.0, V_{[BMIM][PF₆]}:V_TOPO=1:1, compared with V(A)/V(O)=1, the extraction effect was the best for Pr³⁺. The extraction rate can reach 94.2%. The extraction process of Nd³⁺ and Pr³⁺ is exothermic reactions, and the reaction enthalpy change ΔH is -38.43 kJ·mol^-1 and -28.76 kJ·mol^-1, respectively.

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	Articles by authors
	Tu Shenghui
	Zhang Zhiwen
	Zhang Chao
	Peng Hailong
	Du Jun

Keywords： ionic liquid； neutral phosphorus oxygen extractants； rare earths； extraction system； enthalpy change

Received 2019-11-22;

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Tu Shenghui, Zhang Zhiwen, Zhang Chao, Peng Hailong, Du Jun.Application of Hydrophobic Ionic Liquid-Neutral Organophosphorus Extractant in Extraction of Rare Earth Elements[J] Chemcial Industry and Engineering, 2020,V37(5): 22-30

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