Rare earth element extraction method, deep eutectic solvent and preparation method thereof

Abstract

The invention relates to the technical field of rare earth element recovery and discloses a rare earth element extraction method, a deep eutectic solvent and a preparation method thereof. The rare earth element extraction method comprises the steps of stirring and mixing a solid raw material connecting a rare earth element and the deep eutectic solvent at the solid-liquid ratio of 1:5-1:100 at 20-100 DEG C for 1-60 h, conducting separation to obtain a liquid phase containing the rare earth element and treating the liquid phase to obtain the rare earth element. The deep eutectic solvent provided by the invention comprises a hydrogen-bonding acceptor, hydroxyl carboxylic acid and a hydrogen bond donor of polyhydric alcohol or polyhydric acid shown in the formula (1). The deep eutectic solvent can dissolve the rare earth element in the raw material containing the rare earth element at high selectivity and hardly dissolve a transition metal element in a rare earth secondary resource, realizes dissolution and separation simultaneously, and has the good rare earth element extraction effect. According to the preparation method of the deep eutectic solvent, the hydrogen-bonding donor and the hydrogen-bonding acceptor are evenly mixed at the ratio of 1:1-10 at 50-100 DEG C. The preparation method is green and efficient.

Description

technical field [0001] The invention relates to the technical field of recovery of rare earth elements, in particular to an extraction method of rare earth elements, a deep eutectic solvent and a preparation method thereof. Background technique [0002] Rare earth secondary resources are a general term for rare earth-containing wastes generated in human production and life. my country is a big country in rare earth mining, smelting, production and utilization. A large amount of rare earth-containing waste, that is, rare earth secondary resources, will be generated in the process of rare earth mineral mining, functional material production and end product scrapping. Recycling secondary resources is an effective supplement to primary mineral resources. It can reduce the damage to the environment during the mining process of primary resources, solve the problems of land occupation and water and soil pollution caused by waste stacking, and at the same time partially solve the p...

AI Technical Summary

Problems solved by technology

[0006] However, there are very few studies on the application of DES in the extraction of rare earth elements. At present, only European patent EP3375895A1 discloses a method for extracting rare earth elements with a deep eutectic solvent, in which the choline chloride-based deep eutectic solvent is mainly used to extract the rare earth elements from solid leaching rare earth elements, but this method is to extract multiple rare earth elements at the same time, and does not involve the separation of rare earth elements

Images