New membrane process reinforced saponification-free rare earth extraction and separation technology

Abstract

The invention discloses a new membrane process reinforced saponification-free rare earth extraction and separation technology, and belongs to the field of rare earth resource utilization and membrane separation. The process and the method comprise the following steps: extracting mixed rare earth feed liquid by adopting an acidic extraction agent, then efficiently separating rare earth ions and hydrogen ions in raffinate by adopting a nanofiltration membrane or a reverse osmosis membrane, keeping the rare earth ions in the raffinate for subsequent extraction operation, and enabling the hydrogen ions to enter permeate liquid through the membrane, and the permeate liquid can be reused for subsequent acid pickling and reverse extraction processes, so that the regeneration and recycling of the acidic extractant are completed, and finally, the multi-stage dynamic cycle coupling of the extraction process and the membrane separation process is realized. According to the process, an extractant saponification process in a traditional rare earth extraction process can be omitted, the acid and alkali consumption in the extraction process is greatly reduced, the rare earth production cost is reduced, and waste liquid discharge is reduced.

Description

technical field [0001] The invention provides a new technology of non-saponification rare earth extraction and separation with enhanced membrane process, and relates to the fields of rare earth resource utilization and membrane separation. Background technique [0002] Rare earth is an extremely important strategic resource. Because of its excellent physical and chemical properties, it has been widely used in many fields such as national defense, petroleum, chemical industry, metallurgy, magnetic materials, and luminescent materials. With the continuous extension of the application range of rare earths, the demand for their usage is also increasing. [0003] Solvent extraction is the most commonly used method for extracting rare earth elements at home and abroad. In the traditional extraction process, acidic phosphorus extractants (such as P507, P204, etc.) are mostly used, and the rare earth ions in the aqueous phase are exchanged with the cations in the organic phase to r...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of large amount of acid and alkali in the extraction process of rare earth elements, the present invention invents a new technology of non-saponification rare earth extraction and separation with enhanced membrane process

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