Eutectic solvent as well as preparation method and application thereof

The invention discloses a eutectic solvent as well as a preparation method and application thereof, and belongs to the technical field of hydrometallurgy and comprehensive recovery of secondary resources. The eutectic solvent is composed of guanidine hydrochloride, ethylene glycol and organic acid; the organic acid is at least one of glycollic acid, malic acid or lactic acid. The deep eutectic solvent system prepared from guanidine hydrochloride, ethylene glycol and organic acid has the advantages of low preparation cost, low viscosity, cyclic utilization and the like. The system is used for leaching lithium, cobalt, nickel and manganese in the ternary lithium battery positive electrode material, and has the advantages of low leaching temperature, short leaching time and high leaching efficiency of lithium, cobalt, nickel and manganese. 本发明公开了一种低共熔溶剂及其制备方法和应用，属于湿法冶金和二次资源综合回收技术领域。所述低共熔溶剂由盐酸胍、乙二醇和有机酸组成；所述有机酸为乙醇酸、苹果酸或乳酸中的至少一种。本发明利用盐酸胍、乙二醇和有机酸配置的低共熔溶剂体系，具有制备成本低、粘度低、能够循环利用等优点。利用该体系浸出三元锂电池正极材料中的锂、钴、镍、锰，具有浸出温度低、浸出时间