A kind of organic phase extraction rare earth separation process

Abstract

The invention relates to an organic phase extraction rare earth separation process. The saponified organic extractant is mixed with the aqueous phase rare earth liquid, and the rare earth ions are exchanged into the organic phase to complete the rare earth extraction process. After that, the organic phase enters the washing section and or pickling section, and is used Wash the organic phase with acid solution or rare earth solution, or use inorganic acid to strip the rare earth in the organic phase to obtain a blank organic phase as a cycle. The blank organic phase is pretreated before recycling, and the blank organic phase is sequentially stripped with the washing solution. Phase impurities mainly uranium, thorium, and then wash the blank organic phase. By pretreatment of the blank organic phase before circulation, the difficult-to-remove rare earth impurity uranium and thorium is removed, and the content of uranium and thorium in the blank organic phase is reduced to below 10% of the original value, so as to improve the extraction effect of the organic phase and ensure that the organic phase Excellent cycle performance, thereby improving output and product quality.

Description

technical field [0001] The invention belongs to the technical field of rare earth extraction, and in particular relates to a saponified organic phase circulation extraction process for rare earth stock solution. Background technique [0002] Rare earth elements are difficult to separate due to their similar properties. At present, the separation and purification of rare earths generally adopt solvent extraction method. This method is based on the extraction and separation of rare earth elements existing in aqueous solution with an organic solvent immiscible with aqueous solution. A rare earth element with a high separation coefficient or The rare earth element group is preferentially extracted into the organic phase (extractant), and the rare earth element or rare earth element group with a lower separation coefficient is enriched in the water phase, and undergoes multi-stage multi-stage extraction and exchange, thereby realizing the separation of various rare earth elements...

AI Technical Summary

Problems solved by technology

In practice, it is found that the extraction effect of organic extractants will decrease significantly after being recycled for several cycles, which has become a technical problem that plagues those skilled in the art

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