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Preparation method of high-clarity uranium solution

A technology of clarity and solution, applied in the field of nuclear chemical industry, can solve the problems of slow filtration speed, low filtration yield, high energy consumption, etc., and achieve the effects of avoiding clogging, reducing cleaning times, and reducing emulsification

Inactive Publication Date: 2011-07-20
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of preparation method of high-clarity uranium solution, which has obtained high-clarity extraction stock solution (filtrate solid concentration<50mg / L), meets the quality requirement of subsequent extraction process to extraction stock solution, solves the problem of current extraction Problems in raw liquid preparation technology include high energy consumption, low filtration yield or slow filtration speed, low filtrate clarity, and low filtration yield

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Examples

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Embodiment 1

[0022] like figure 1 Shown, adopt the inventive method to obtain high-clarity uranium solution:

[0023] (1) At 75°C, use nitric acid solution to dissolve sodium diuranate, with the concentration of nitric acid in a mass percentage of 63%, until the solid solution of sodium diuranate is completely dissolved, and the acid dissolution ends;

[0024] (2) 0.5 hours at the end of step (1) acid dissolution, add diatomite to the uranium solution obtained in step (1) under stirring conditions, and the diatomite add-on is 20kg per cubic meter of solution; react for 0.5 hours Finish;

[0025] (3) Then step (2) is completed for 0.5 hours, and the uranium solution is filtered by a plate and frame filter press to obtain a uranyl nitrate solution, the uranium concentration is 287g / L, and the solid concentration in the solution is <50mg / L. Among them, the filter cloth of the plate and frame filter press is pre-coated with a layer of diatomite, the thickness of the diatomite coating is 1.5m...

Embodiment 2

[0029] like figure 1 Shown, adopt the inventive method to obtain high-clarity uranium solution:

[0030] (1) At 50°C, use nitric acid solution to dissolve ammonium diuranate; the concentration of nitric acid in mass percentage is 40%, until the diuranate solid dissolves completely, and the acid dissolution ends;

[0031] (2) 24 hours at the end of step (1) acid dissolution, add diatomite to the uranium solution obtained in step (1) under stirring conditions, and the diatomite add-on is 1g per cubic meter of solution; react for 0.5 hours Finish.

[0032] (3) Then step (2) is completed for 5 hours, and the uranium solution is filtered by a plate and frame filter press to obtain a uranyl nitrate solution, the uranium concentration is 255g / L, and the solid concentration in the solution is <50mg / L. Among them, the filter cloth of the plate and frame filter press is pre-coated with a layer of diatomite, the thickness of the diatomite coating is 1mm, and the filtration pressure is ...

Embodiment 3

[0034] like figure 1 Shown, adopt the inventive method to obtain high-clarity uranium solution:

[0035] (1) At 100°C, use nitric acid solution to dissolve sodium diuranate; the concentration of nitric acid in mass percent is 98%, until the sodium diuranate solid dissolves completely, and the acid dissolution ends;

[0036] (2) 10 hours after step (1) acid dissolution, add diatomite to the uranium solution of step (1) gained under agitation, the diatomite add-on is 50kg per cubic meter of solution; react for 1 hour Finish.

[0037] (3) Then step (2) is completed for 3 hours, and the uranium solution is filtered by a plate and frame filter press to obtain a uranyl nitrate solution, the uranium concentration is 315g / L, and the solid concentration in the solution is <50mg / L. Among them, the filter cloth of the plate and frame filter press is pre-coated with a layer of diatomite, the thickness of the diatomite coating is 2mm, and the filtration pressure is 0.6Mpa. The uranium c...

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Abstract

The invention provides a preparation method of a high-clarity uranium solution, comprising the following steps of: (1) dissolving diuranate solid in a nitric acid solution until the diuranate solid is completely dissolved to finish acid dissolution; (2) within 0-24 hours after acid dissolution, under the condition of stirring, adding 1-50kg of kieselguhr per cubic meter of the uranium dissolving solution obtained in the step (1), reacting for 0.5-1 hour; and (3) within 0-5 hours after the step (2), filtering the uranium dissolving solution by a plate and frame filter press to obtain a uranyl nitrate solution with the solid concentration of less than 50mg / L, wherein a layer of kieselguhr is pre-coated on the filter cloth of the plate and frame filter press, the coating thickness of the kieselguhr is 1-2mm, and the filtration pressure is 0.2-0.6MPa. The preparation method provided by the invention acquires a high-clarity extraction stock solution by an economical means, and meets the requirements of the subsequent extraction process on the quality of the extraction stock solution.

Description

technical field [0001] The invention relates to a solid-liquid separation technology in the field of nuclear chemical industry, in particular to a method for preparing a high-clarity uranium solution. Background technique [0002] During the nuclear fuel cycle, a series of chemical processes for producing nuclear-grade or nuclear-electric-grade products from crude uranium concentrate (yellow cake) are called uranium refining processes. The refining of uranium is divided into dry refining and wet refining. In the wet refining process of uranium, it mainly includes several processes such as solid-liquid separation, extraction and separation, precipitation and crystallization, and dry calcination. Extraction and separation are the core of the uranium refining process. How to reduce the occurrence of emulsification in the extraction process is the focus of research on the extraction process for many years. [0003] The raw material of the uranium refining process is prepared by...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/22C22B60/02
Inventor 牛玉清舒祖骏赵凤岐周志全张永明李伟才刘超
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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