Method for extracting uranium and thorium from southern ionic rare-earth lixivium

A technology of ionic rare earth and leaching solution, which is applied in the field of extracting uranium and thorium, can solve the problems of extraction and separation of uranium and thorium, and achieve the effect of high extraction rate, simple process and good separation effect

Active Publication Date: 2013-02-27
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly two methods for separating uranium and thorium from rare earth leaching solutions: one is extraction and separation of thorium from sulfated roasting rare earth leaching solution N1923, b

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Southern ionic type rare earth leach solution, in which the concentration of rare earth ions is 1.7mol / L, the concentration of uranium is 10mg / L, and the concentration of thorium is 12mg / L, [H + ] Concentration is 0.000015mol / L. The extraction agent of 15% naphthenic acid-15% octanol-70% kerosene and the southern ionic type rare earth leachate were extracted in a single stage at a volume ratio of 3:1. After extraction, the concentration of uranium in the water phase was determined to be 0.080mg / L , thorium concentration is 0.07mg / L, and the extraction rate of uranium and thorium is calculated to be 99%; then the loaded organic phase is compared with 2mol / L sulfuric acid solution in a volume ratio of 0.15:1 for single-stage back extraction, after back extraction, The organic phase is returned for reuse, and the aqueous phase is a solution enriched in uranium and thorium, which are further recovered.

Embodiment 2

[0012] Southern ionic rare earth leach solution, in which the concentration of rare earth ions is 1.2mol / L, the concentration of uranium is 18mg / L, and the concentration of thorium is 25mg / L, [H + ] The concentration is 0.03mol / L. The extraction agent of 25% naphthenic acid-25% isooctyl alcohol-50% kerosene and the southern ionic type rare earth leach solution were subjected to three-stage countercurrent extraction at a volume ratio of 5:1. After extraction, the concentration of uranium in the water phase was determined to be 0.075 The concentration of mg / L and thorium is 0.06mg / L, and the extraction rate of uranium and thorium is calculated to be 99%; then the loaded organic phase is compared with the hydrochloric acid solution with a concentration of 5mol / L at a volume ratio of 9:1 for 5-stage back extraction , after stripping, the organic phase is returned for reuse, and the aqueous phase is a solution enriched in uranium and thorium, and the uranium and thorium are further...

Embodiment 3

[0014] Southern ionic rare earth-leach solution, in which the concentration of rare earth ions is 0.85 mol / L, the concentration of uranium is 19 mg / L, and the concentration of thorium is 28 mg / L, [H + ] The concentration is 0.9mol / L. , the extractant of 25% naphthenic acid-15% octanol-60% kerosene and the southern ionic rare earth leachate were subjected to 7-stage countercurrent extraction at a volume ratio of 0.6:1. After extraction, the concentration of uranium in the water phase was determined to be 0.050 mg / L, thorium concentration is 0.06mg / L, the calculated uranium and thorium extraction rate reaches 99%; then the loaded organic phase is compared with the nitric acid solution with a concentration of 5mol / L at a volume ratio of 6:1 for 4-stage stripping , after stripping, the organic phase is returned for reuse, and the aqueous phase is a solution enriched in uranium and thorium, and the uranium and thorium are further recovered.

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Abstract

The invention relates to a method for extracting uranium and thorium from a southern ionic rare-earth lixivium, which is characterized by comprising the following steps: (1) carrying out uranium and thorium extraction separation by using a 15-25 vol% naphthenate-15-25 vol% octanol or isooctanol-50-70 vol% kerosene extractant and a southern ionic rare-earth lixivium in a volume ratio of (0.5-5):1; and (2) carrying out back extraction on the loaded organic phase obtained in the step (1) and a 2-5 mol/L sulfuric acid, hydrochloric acid or nitric acid solution in a volume ratio of (0.1-10):1, wherein the organic phase after the back extraction returns to the step (1) for repeated use, and the water phase, which is the solution with enriched uranium and thorium, is used for recycling uranium and thorium. The method provided by the invention can selectively separate uranium and thorium from the rare-earth lixivium, has the advantages of fewer extraction stages, simple technique, favorable separating effect, no influence on subsequent rare-earth separation technique, and high extraction ratio of uranium and thorium.

Description

technical field [0001] The invention relates to a method for extracting uranium and thorium from southern ionic rare earth leaching solution. Background technique [0002] Rare earth minerals all contain a certain amount of radioactive substances, and the radioactive content of different rare earth minerals is quite different. In the past, people's research on rare earth radioactivity mainly focused on monazite, bastnaesite and their mixed ores. However, ionic rare earth ores in my country also contain some radioactive elements, mainly uranium, thorium and radium. Because the ionic rare earth ore contains some radioactive elements, the rare earth leaching solution contains a small amount of radioactive elements uranium and thorium, in which the concentration of uranium is 10~30mg / L, the concentration of thorium is 5~30mg / L, and the total radioactivity of the leaching solution is relatively high; these Radioactive elements are further dispersed during the separation process,...

Claims

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Application Information

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IPC IPC(8): C22B60/02C22B3/40
Inventor 刘志强邱显扬朱薇郭秋松
Owner GUANGDONG INST OF RARE METALS
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