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A method for separating thorium and enriching rare earths from radioactive waste leachate based on poaa

A leachate and radioactivity technology, which is applied in the field of separation of thorium and enrichment of rare earths from the leachate of radioactive waste residue based on POAA, can solve the problems of enrichment of thorium rare earths, and achieve the effects of fast sedimentation speed, small environmental impact, and large precipitated particle size

Active Publication Date: 2021-06-29
XIAMEN INST OF RARE EARTH MATERIALS
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Problems solved by technology

[0004] The object of the present invention is to provide a POAA-based method for separating thorium and enriching rare earths from radioactive waste leaching liquid, so as to solve the problem of separation of thorium in radioactive waste and enrichment of rare earths

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  • A method for separating thorium and enriching rare earths from radioactive waste leachate based on poaa
  • A method for separating thorium and enriching rare earths from radioactive waste leachate based on poaa
  • A method for separating thorium and enriching rare earths from radioactive waste leachate based on poaa

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[0032] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] The invention discloses a method for separating thorium and enriching rare earths from radioactive waste leachate based on POAA, which includes the following steps:

[0034] (1) Perform liquid-liquid extraction of the leaching solution of radioactive waste residue and POAA solution to obtain an organic phase loaded with thorium ions and a raffinate aqueous phase, and the organic phase loaded with thorium ions is back-extracted with an acid solution to obtain a regenerated POAA solution and thorium Ion enrichment solution;

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Abstract

The invention relates to the field of separation and recovery of thorium and rare earths, and discloses a method for separating thorium and enriching rare earths from radioactive waste leachate based on POAA, including the following steps: (1) performing liquid-liquid extraction on the leachate of radioactive waste leach and POAA solution, An organic phase and a raffinate aqueous phase loaded with thorium ions are obtained, and the organic phase loaded with thorium ions is back-extracted with an acid solution to obtain a regenerated POAA solution and a thorium ion enrichment solution; (2) the raffinate in step (1) The aqueous phase and the saponified POAA are extracted to obtain rare earth deposits and raffinate, and the described rare earth deposits are acid-washed to obtain regenerated POAA and rare earth ion enrichment liquid; among the present invention, unsaponified POAA has relatively Good selectivity, unsaponified POAA basically does not extract rare earths. Optimizing the extraction conditions can make the extraction efficiency of thorium reach more than 99%. After saponification, POAA precipitates and enriches rare earths with fast settling speed, large precipitated particle size, small environmental impact and The advantage of being recyclable.

Description

technical field [0001] The invention relates to the field of separation and recovery of thorium and rare earths, in particular to a method for separating thorium and enriching rare earths from radioactive waste leaching liquid based on POAA. Background technique [0002] With the development of my country's rare earth industry and people's increasing awareness of environmental protection, the problem of radioactivity in ionic rare earth ores has become increasingly prominent. During the mining process of ion-type rare earth ore, radioactive elements are taken out of the mine by the leaching solution and enriched in the liquid collection tank. In acid slag. In the process of processing radioactive waste, in order to avoid the pollution of radioactive thorium to the rare earth extraction and separation line, the efficient separation of thorium from the leaching solution of waste slag is the first step in the safe treatment of waste slag recovery. Liquid-liquid extraction (so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/32C22B60/02C22B59/00
CPCC22B7/006C22B59/00C22B60/0291C22B3/326Y02P10/20
Inventor 孙晓琦苏佳
Owner XIAMEN INST OF RARE EARTH MATERIALS
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