A kind of extraction separation method of thorium

Abstract

The invention provides a method for extraction and separation of thorium. The rare earth waste residue is mixed with hydrochloric acid, and after solid-liquid separation, the hydrochloric acid leaching solution is obtained, and the pH value is adjusted; an electrolyte capable of ionizing sulfate radicals is added to the hydrochloric acid leaching solution of the rare earth waste residue; The amine is mixed with the diluent to obtain the extractant; the leachate and the extractant are mixed according to a preset volume ratio for extraction, and the thorium-loaded organic phase obtained by extraction and separation is stripped with a stripping agent to obtain a solution containing thorium ions and recovered Extracting agent. The present invention uses hydrochloric acid to leach the radioactive waste residue of ionic rare earth mines, and through the comprehensive adjustment of N1923 concentration, sulfate concentration, and solution acidity, the extraction rate of thorium can reach more than 95%, but the rare earth is hardly extracted; the realization of thorium The separation factor with rare earths is on the order of 10 5 Above; moreover, the thorium in the organic phase is back-extracted completely, and after many cycles, the extraction capacity of the extractant is not significantly reduced, and can be reused.

Description

technical field [0001] The invention belongs to the field of thorium extraction and separation methods, in particular to a method for extracting and separating thorium from a hydrochloric acid leaching solution of ionic radioactive waste residue. 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 slag treatment, in order to avoid the pollution of the radioactive thorium element to the rare earth extraction and separation line, the efficient separation of thorium element from the leaching solution of waste slag is the first step in the safe treatment of waste slag recovery. Liquid-liquid ext...

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Problems solved by technology

Combined with the current single rare earth separation practice in the factory, all of them are carried out in the chloride salt solution, which often converts the sulfuric acid rare earth solution into a hydrochloric acid rare earth solution. In addition, the leaching rate of rare earth radioactive slag leached by sulfuric acid is lower than that of hydrochloric acid. It is not suitable to use sulfuric acid to leaching the southern Ionic radioactive waste

Therefore, it is impossible to directly use primary amine N1923 to treat radioactive waste residues of ionic rare earth mines.

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