Rare earth separation method with material linkage cyclic utilization function

Abstract

The invention relates to a rare earth separation method with the material linkage cyclic utilization function. The rare earth separation method comprises the following steps: the organic phase of loaded rare earth prepared by extractant A and rare earth soap stock through mixing is used for the follow-up linkage extraction separation, and inorganic acid in the residual water phase is extracted and concentrated by extractant C and is then reused for material dissolving or recovering rare earth with oxalic acid precipitated therein; purified rare earth solution is subjected to extraction separation, the rare earth is precipitated through oxalic acid, sediment mother solution containing oxalic acid and inorganic acid is mixed with extractant B, the oxalic acid is extracted to be reused for precipitating rare earth, and the residual inorganic acid is directly used for washing and back extraction processes or is used for material dissolving after being concentrated by the extractant C. With the rare earth separation method provided by the invention, intermediate materials generated in the rare earth separation process can be recycled in process sections in a linkage manner, the alkali saponification process is avoided, and the material dissolving, washing and back extraction processes can be finished only by the recycled inorganic acid, so that the rare earth separation and purification process disclosed by the invention does not consume alkaline and inorganic acid, the cost is low, and the rare earth separation method is green and environmental-friendly.

Description

Technical field [0001] The invention belongs to the technical field of rare earth separation, and specifically relates to a rare earth separation method for material linkage and recycling. Background technique [0002] Rare earth is the general term for all fifteen lanthanide elements of scandium and yttrium. Due to their similar chemical properties, they coexist in minerals. The excellent optical, electrical, magnetic, and catalytic intrinsic properties of each element often require a single high-purity rare earth. Be fully reflected. Therefore, separation and purification has become an important process in the rare earth material industry. [0003] The separation and purification of rare earth usually adopts solvent extraction separation method, which has the advantages of large processing capacity, fast reaction speed and good separation effect. It is the main production method for rare earth separation at home and abroad. The extractants used in rare earth extraction and sepa...

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Problems solved by technology

Chinese patent application "A Washing Method for Oxalic Acid Precipitation" (Application No.: 201110095141.2 Application Date: 2011-04-15, Publication Date: October 26, 2011) uses organic solvent extraction to regenerate water, and does not consider hydrochloric acid and oxalic acid For recycling, the acid still needs to be neutralized, resulting in the discharge of salty wastewater

[0022] The above methods are all aimed at a single process, and can only reduce the consumption of reagents or wastewater discharge in a single link. They do not consider the separation process as a whole, and do not link the production and utilization of reagents in different processes. In the end, a large amount of saline wastewater will still be generated. Unable to remove environmental pressure from rare earth separation

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