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A method for purifying uranium from alkali slag leaching solution with multi-outlet design

A purification method and multi-export technology, applied in the field of hydrometallurgy, can solve the problems of reducing the concentration of uranium in purified wastewater, the influence of uranium purification effect, and reducing the amount of purified wastewater, so as to reduce the consumption of reagents, have strong practicability and good effect. Effect

Active Publication Date: 2021-08-17
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Application Information

AI Technical Summary

Problems solved by technology

If the raffinate water phase is returned to leaching, the impurities contained in it will also circulate in the system, which will inevitably form a leach solution with higher impurity content, which will affect the purification effect of uranium
[0007] The continuous production of alkali slag and its temporary storage will affect the production safety and resource utilization of enterprises. The existing purification technology mainly treats crude uranium concentrates containing natural uranium with low impurity content. Therefore, the development of highly efficient alkali The uranium purification method of the slag leaching solution is of great practical significance to solve the problem of uranium purification with high impurity content in the alkali slag leaching solution, reduce the amount of purified wastewater, and reduce the concentration of uranium in the purified wastewater

Method used

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  • A method for purifying uranium from alkali slag leaching solution with multi-outlet design
  • A method for purifying uranium from alkali slag leaching solution with multi-outlet design

Examples

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example 1

[0051]In an alkali slag leaching solution, the uranium concentration is 120g / L, the nitric acid concentration is 3.2mol / L, the total mass concentration of impurities is 80g / L, and the turbidity is 35ppm.

[0052] During the extraction process, the concentration of TBP in the organic phase is 30%, and the extraction flow ratio V O :V A The ratio is 1:0.87, the number of extraction stages is 5, the extraction temperature is 18°C, and the uranium concentration in the obtained loaded organic phase is 104.5g / L. The return ratio of the water phase is 50%, the export is increased in the fourth stage, and the concentration of uranium in the raffinate water phase is 4.1mg / L.

[0053] During the washing process, water is used as the detergent at the start, and after the back extraction liquid is prepared, the back extraction liquid is used as the detergent, and the washing flow ratio V O :V A The ratio is 15:1, the number of washing stages is 2, and the washing temperature is 18°C. T...

example 2

[0056] In an alkali slag leaching solution, the uranium concentration is 96g / L, the nitric acid concentration is 2.5mol / L, the total mass concentration of impurities is 58.2g / L, and the turbidity is 40ppm.

[0057] During the extraction process, the TBP concentration in the organic phase is 24%, and the extraction flow ratio V O :V A The ratio is 1:0.87, the number of extraction stages is 5, the extraction temperature is 22°C, and the uranium concentration in the obtained loaded organic phase is 83.6g / L. The return ratio of the water phase is 45%, the export is increased in the fourth stage, and the concentration of uranium in the raffinate water phase is 3.2mg / L.

[0058] During the washing process, 3mol / L nitric acid solution is used as the detergent for starting, and after the back extraction liquid is prepared, the back extraction liquid is used as the detergent, and the washing flow ratio V O :V A The concentration of uranium in the loaded organic phase after washing w...

example 3

[0061] In a certain alkali slag leaching solution, the uranium concentration is 132g / L, the nitric acid concentration is 3.5mol / L, the total mass concentration of impurities is 67.7g / L, and the turbidity is 32ppm.

[0062] During the extraction process, the concentration of TBP in the organic phase is 30%, and the extraction flow ratio V O :V A The ratio is 1:0.8, the number of extraction stages is 6, the extraction temperature is 15°C, and the uranium concentration in the obtained loaded organic phase is 105.6g / L. The return ratio of the water phase is 35%, the export is increased in the fourth stage, and the concentration of uranium in the raffinate water phase is 4.8mg / L.

[0063] During the washing process, 1mol / L nitric acid solution is used as the detergent at the start, and after the back extraction liquid is prepared, the back extraction liquid is used as the detergent, and the washing flow ratio V O :V A The concentration of uranium in the loaded organic phase afte...

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Abstract

The invention relates to the technical field of hydrometallurgy, and specifically discloses a method for purifying alkali residue leaching liquid uranium with a multi-outlet design, comprising the following steps: step 1: extraction; step 2: washing; step 3: back extraction. The method of the invention can carry out uranium purification on the alkali residue leachate system with high impurity content, reduce the amount of waste water in the alkali residue leachate uranium purification and the uranium concentration in the waste water, and has the advantages of high separation efficiency, good uranium purification effect, economical environmental protection and strong practicability The advantages.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for purifying uranium from an alkali slag leaching solution with a multi-outlet design. Background technique [0002] Alkali slag is uranium-containing waste generated during the processing of PWR nuclear fuel elements, mainly from the treatment process of uranium-containing wastewater in the nuclear fuel element processing process. The uranium-containing wastewater is precipitated and filtered by ammonium salt to obtain uranium-containing wet alkali slag, which is temporarily stored in the form of dry alkali slag after being calcined at a high temperature of about 800°C to reduce volume and weight. With the rapid development of nuclear energy in our country, the demand for nuclear fuel components is increasing rapidly. At the same time, the increasing amount of alkali slag has had a certain impact on the development of the enterprise. How to recove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B60/02C22B3/38
CPCC22B7/006C22B60/026C22B3/3846Y02P10/20
Inventor 支梅峰舒祖骏王皓赵凤岐牛玉清周志全
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY