Extraction purification method for recycling uranium from fluoridation ash residues

A technology of fluorination reaction and purification method, which is applied in the field of uranium conversion, and can solve problems such as unsystematic research on uranium recovery technology in fluoride slag, ash dumping, difficulty in crushing, and small production capacity of UF6 , achieving significant economic and environmental benefits, easy industrial application, and simple structure

Inactive Publication Date: 2018-06-15
THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dry recycling process has the advantages of short process and less secondary waste, but it is difficult to pour out and crush the ash during the dry recycling process
[0005] In China, due to the small production capacity of UF6 in the early stage and the relatively small amount of fluoride slag produced in the process, the research on the recovery technology of uranium in fluoride slag has not been systematically carried out, but the canned and sealed temporary storage method is used for processing

Method used

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  • Extraction purification method for recycling uranium from fluoridation ash residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Step 1: Prepare materials;

[0052] Take out the fluoride slag material from the fluoride slag tank;

[0053] Step 2: hydrolysis of fluoride slag;

[0054] Place the taken out fluoride slag in the hydrolysis reactor, add deionized water heated to 70°C according to the mass ratio of fluoride slag to deionized water of 1:1, start the stirring device of the hydrolyzer, and deionize the fluoride slag Hydrolysis, during the hydrolysis process, control the reaction temperature to keep at 70°C, and react for 45 minutes;

[0055] Step 3: Nitric acid dissolution, aluminum nitrate eliminates the effect of fluoride ions;

[0056] According to the amount that the mass fraction of 65% nitric acid and the mass ratio of fluoride slag is 1:1, add 65% nitric acid to the hydrolyzed fluoride slag solution, react for 4 hours, control the reaction temperature to be 70° C. The uranium fluoride solid material is completely dissolved;

[0057] According to the ratio of the molar amount of ...

Embodiment 2

[0063] Step 1: Prepare materials;

[0064] Take out the fluoride slag material from the fluoride slag tank;

[0065] Step 2: hydrolysis of fluoride slag;

[0066] Place the taken out fluoride slag in the hydrolysis reactor, add deionized water heated to 80°C according to the mass ratio of fluoride slag to deionized water of 1:2, start the stirring device of the hydrolyzer, and deionize the fluoride slag Hydrolysis, during the hydrolysis process, control the reaction temperature to keep at 80°C, and react for 60 minutes;

[0067] Step 3: Nitric acid dissolution, aluminum nitrate eliminates the effect of fluoride ions;

[0068] According to the mass ratio of 65% nitric acid and fluoride slag mass ratio of 1.5:1, add 65% nitric acid in mass fraction to the hydrolyzed fluoride slag solution, react for 6 hours, and control the reaction temperature to be 75° C. The solid material of uranium fluoride is completely dissolved. According to the ratio of the molar amount of aluminum ...

Embodiment 3

[0074] Step 1: Prepare materials;

[0075] Take out the fluoride slag material from the fluoride slag tank;

[0076] Step 2: hydrolysis of fluoride slag;

[0077] Place the taken out fluoride slag in the hydrolysis reactor, add deionized water heated up to 75°C according to the mass ratio of fluoride slag to deionized water of 1:1.5, start the stirring device of the hydrolyzer, and deionize the fluoride slag Hydrolysis, during the hydrolysis process, control the reaction temperature to keep at 75°C, and react for 50 minutes;

[0078] Step 3: Nitric acid dissolution, aluminum nitrate eliminates the effect of fluoride ions;

[0079] According to the amount that the mass fraction of 65% nitric acid and the mass ratio of fluoridated slag is 1.3:1, add the nitric acid of mass fraction 65% to the hydrolyzed fluorided slag solution, react for 5h, control the reaction temperature to be 73 DEG C, make the hydrolyzed four The solid material of uranium fluoride is completely dissolved...

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Abstract

The invention relates to the technical field of uranium conversion and particularly discloses an extraction purification method for recycling uranium from fluoridation ash residues. The extraction purification method comprises the following steps of 1, preparing materials; 2, conducting hydrolysis on the fluoridation residues; 3, conducting dissolution through nitric acid, and eliminating the fluorinion effect through aluminum nitrate; and 4, conducting extraction, washing and reextraction, so that a nuclear-purity-grade uranyl nitrate solution is obtained. According to the extraction purification method, special properties of a fluorination residue material are combined, and a process route which can be used for recycling the uranium from the fluoridation residues is developed; the process route is novel in concept, simple in procedure and feasible; by means of the method, metal impurity elements in the fluoridation residues can be effectively removed, and the nuclear-purity-grade uranyl nitrate solution is obtained; and the nuclear-purity-grade uranyl nitrate solution can be directly used as a uranium purification conversion process raw material.

Description

technical field [0001] The invention belongs to the technical field of uranium conversion, and in particular relates to an extraction and purification method for recovering uranium from fluoridation reaction ash. Background technique [0002] A certain amount of fluoride slag will inevitably be produced during the conversion of natural uranium to prepare UF6 with the vertical fluorination reactor as the key equipment. According to theoretical analysis and actual measurement, the main component of fluoride slag is intermediate fluoride of uranium. Among them, the uranium content level is relatively high, and the recovery of uranium in the fluoride slag can realize the reuse of uranium resources in the slag, and has significant economic benefits. But at the same time, the content of metal impurity elements and fluoride ions in fluoridated slag is very high, the total content of metal impurity elements is about 30mg / g slag, while the fluoride ion content in the hydrolyzate of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/38C22B60/02
CPCC22B7/007C22B60/0239C22B60/026C22B3/3846Y02P10/20
Inventor 陈俭刚陈建勇魏刚茹发全罗明灿陈红卫薛彦成高兴星常宇王伟马治军张振兴王校峰邹琛华刘璞李贺成牟立明
Owner THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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