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Method for producing diuranate by extracting uranium from rare earth slag containing uranium

A technology of heavy uranium salts and rare earths, applied in the direction of improving process efficiency, etc., can solve problems such as difficulties in industrialization implementation, product quality, and low uranium recovery rate, so as to broaden the utilization channels of uranium resources, solve pollution problems, Solve the effect of extraction and emulsification

Inactive Publication Date: 2010-11-17
李志伟 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology of extracting uranium from uranium-containing rare earth slag to produce diuranate is currently in the stage of laboratory technology research, and has not yet broken through; it is generally difficult to implement industrialization, such as low recovery rate of uranium, low extraction capacity, extraction emulsification and other problems. Its products The quality does not meet the standard requirements of diuranate technical conditions (EJ / T803-93)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1) leaching of uranium: take 1000kg of uranium-containing rare earth slag (dry basis) (uranium dry basis content is U: 0.89%), and add 1500L of dilute sulfuric acid with a concentration of 10% V / V according to the liquid-solid ratio of 1.5 / 1, Stirring and leaching for 3 hours, the reaction temperature is 40°C; then pump the leached uranium-containing slurry into a plate and frame filter press for solid-liquid separation to obtain 1456L leaching solution;

[0014] 2) Preparation of the extraction stock solution: the obtained 1456L leachate was adjusted with sulfuric acid for acidity, and the sulfuric acid acidity of the prepared extraction stock solution was 0.05g / L,

[0015] 3) Extraction of uranium: use the mixed clarifier to carry out 5-stage countercurrent extraction of the prepared extraction stock solution, and use a mixture of 3% trioctylamine, 3% sec-octanol and 94% sulfonated kerosene as the organic phase system , the water phase is the extraction stock solution...

Embodiment 2

[0020] 1) Leaching of uranium: take 1000kg of uranium-containing rare earth slag (dry basis) (uranium dry basis content is U: 0.72%), and add dilute sulfuric acid with a concentration of 15% (V / V) according to the liquid-solid ratio of 1 / 1 1000L, stirred and leached for 3 hours, and the reaction temperature was 25°C; then the leached uranium-containing slurry was pumped into the plate and frame filter press for pressure filtration, and solid-liquid separation was carried out to obtain 987L leachate;

[0021] 2) Preparation of the extraction stock solution: adjust the acidity of the obtained 987L leaching solution with sulfuric acid, and the sulfuric acid acidity of the prepared extraction stock solution is 96g / L;

[0022] 3) Extraction of uranium: use the mixed clarifier to carry out 6-stage countercurrent extraction of the prepared extraction stock solution, and use a mixture of 8% trioctylamine, 5% secondary octanol and 87% sulfonated kerosene as the organic phase system , t...

Embodiment 3

[0027] 1) Leaching of uranium: take 1000kg of uranium-containing rare earth slag (dry basis) (uranium dry basis content is U: 1.07%), and add dilute sulfuric acid with a concentration of 12% (V / V) according to the liquid-solid ratio of 1.5 / 1 1000L, stirred and leached for 3 hours, and the reaction temperature was 65°C; then pumped the leached uranium-containing slurry into a plate and frame filter press for solid-liquid separation to obtain 1442L leaching solution;

[0028] 2) Preparation of the extraction stock solution: adjust the acidity of the obtained 1442L leaching solution with sulfuric acid, and the sulfuric acid acidity of the prepared extraction stock solution is 37g / L;

[0029] 3) Extraction of uranium: The prepared extraction stock solution is subjected to 5-stage countercurrent extraction with a mixing clarifier, and the organic phase system is a mixture of 5% N235, 3% 2-octanol and 92% sulfonated kerosene, containing The uranium leaching solution is an aqueous ph...

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PUM

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Abstract

The invention relates to a method for producing diuranate by carrying out uranium-thorium separation by using rare earth slag and a preparation method of a used reagent. The method comprises the following steps of: carrying out uranium lixiviation on the rare earth slag; regulating the pH of uranium lixivium; carrying out reflux uranium extraction under the action of trifatty amine and mixed alcohol so as to achieve the purpose of the uranium-thorium separation; and carrying out reextraction and sedimentation to obtain a diuranate product with quality meeting or exceeding the standard requirements of diuranate technical conditions (EJ / T803-93). The invention successfully solves the difficulties in producing the diuranate by carrying out the uranium-thorium separation by using the rare earth slag, breaks through the technical bottleneck of difficult industrialization realization, reduces the environmental protection pressure, expands the channels of uranium production raw materials and saves the resources.

Description

technical field [0001] The invention belongs to the field of uranium production and relates to a method for extracting uranium from uranium-containing rare earth slag to produce diuranate. Background technique [0002] At present, the rare earth slag in our country is the slag prepared to be discarded after the rare earth is extracted from the rare earth mine. Now the rare earth manufacturers use the stacking method to deal with the rare earth slag, which pollutes the environment. The grade of uranium in rare earth slag generally ranges from one thousandth to ten percent. The technology of extracting uranium from uranium-containing rare earth slag to produce diuranate is currently in the stage of laboratory technology research, and has not yet broken through; it is generally difficult to implement industrialization, such as low recovery rate of uranium, low extraction capacity, extraction emulsification and other problems. Its products The quality does not meet the standard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/06C22B3/28C22B60/02
CPCY02P10/20
Inventor 杨立峰李春湘陈英喜李志伟吴戎兵
Owner 李志伟
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