Process for extracting and recycling waste containing rare earth through solvent

Abstract

The invention relates to a process for extracting and recycling waste containing rare earth through a solvent. Rare earth waste containing Ce, Pr, Dy, Er and Tm is subjected to high-temperature sintering, hydrochloric acid leaching is performed, and the pH value is adjusted; and then, a novel extraction agent P227 and a traditional extraction agent P507 form a mixed organic phase, unsaponified extraction is performed in cooperation with a resin phase, extraction reverse extraction activity of different rare earth elements is utilized, and the separation sequences of all the rare earth elementsare controlled. The process for extracting and recycling the waste containing the rare earth through the solvent has the advantages that a Tm product is high in purification and yield, the process can be used for mass production, the whole process is small in overall chemical regent consumption, automation is achieved easily, operation is simple and convenient, the production cost is low, and thelike.

Description

technical field [0001] The invention relates to the field of recovery of valuable metals, in particular to a process for recovery of rare earth-containing waste through solvent extraction. Background technique [0002] Rare earth elements play an important role in the construction of global modern industrialization in the 21st century, which is inseparable from their excellent magnetic, optical, and electrical properties. Because of this, rare earth metals are crucial to some of the fastest growing industries in the world, such as catalysts, magnetic materials, glass, metallurgy, electronics, and phosphors, and are indispensable for upgrading traditional industries, developing defense technology industries, and creating new industries key elements and important non-renewable strategic resources. With the application of rare earths in catalysts, magnets, and rare earth alloys, the global demand for rare earths will grow at an annual rate of 6% before 2020. After the rare ea...

AI Technical Summary

Problems solved by technology

[0004] At present, in industrial production, alkaline substances such as ammonia water are mainly used to saponify P507 and P204 extractants to extract and separate rare earth elements, and high concentrations of NH are produced during the extraction and separation process. 4+ 、Na + or Ca 2+ The saponification wastewater will seriously endanger the environment. The problem of ammonia nitrogen wastewater is the most difficult environmental problem faced by rare earth separation plants in recent years. Moreover, the traditional extraction and separation of rare earth elements still has long process, variable components, mass transfer lag, organic Phase consumption and safety hazards and other issues