A kind of recovery method of electrolytic fluorine waste electrolyte

A waste electrolyte and recovery method technology, applied in the direction of electrolysis components, electrolysis process, chemical instruments and methods, etc., can solve the problems of high iron and copper, and achieve the effect of increasing ion product

Active Publication Date: 2022-03-22
中核二七二铀业有限责任公司
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Problems solved by technology

[0002] In the field of uranium conversion electrolysis to produce fluorine, the recovery and treatment methods of waste electrolyte mainly adopt heating concentration crystallization method and direct cooling crystallization method. According to different impurities, impurity removal treatment is required before crystallization. Impurities in water can be removed by dissolving in water and liquid-solid separation. However, for medium-temperature fluorine-producing electrolyzers, there are waste electrolytes that cannot run out of the system due to high content of iron and copper. This part of the electrolyte needs to be removed. The newly purchased electrolyte level can only be reached after sub-adjusting the pH

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  • A kind of recovery method of electrolytic fluorine waste electrolyte

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Embodiment Construction

[0035] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Such as figure 1 Shown, a kind of electrolytic fluorine waste electrolyte recovery method of the present invention comprises the following steps:

[0037] (1) Dissolution of waste electrolyte

[0038] By dissolving the solid waste electrolyte in the electrolytic cathode alkali washing wastewater;

[0039] In the solid waste electrolyte, the main component is potassium bifluoride, and the mass content of potassium bifluoride is 80-90%, specifically 88% in this embodiment; other impurities are carbon powder, iron, and copper;

[0040] The composition of electrolytic cathode alkaline washing wastewater is potassium fluoride solution with a concentration of 100-150g / L; the temperature of electrolytic cathode alkaline washing wastewater is 60-80°C;

[0041] The liquid is filtered and separated by a centrifuge; ...

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Abstract

The invention belongs to the technical field of electrolytic fluorine production by uranium conversion, and in particular relates to a recovery method of waste electrolyte for electrolytic fluorine production. The method comprises the following steps: (1) dissolving waste electrolyte; (2) adjusting pH; (3) crystallizing potassium bifluoride. A clear electrolyte solution can be obtained by dissolution and filtration. By adjusting the pH to 3-4, controlling the pH of copper removal to 10-12, and adjusting the pH to 3-4 before crystallization, the recycled electrolyte with the index similar to that of the newly purchased electrolyte can be prepared. Through research, the electrolytic cathode is used to treat alkaline wastewater, acidic wastewater is used to dissolve waste electrolytes, and pH adjustment can increase the ion product of potassium bifluoride during electrolyte crystallization.

Description

technical field [0001] The invention belongs to the technical field of uranium conversion and electrolytic fluorine production, and in particular relates to a recovery method for electrolytic fluorine waste electrolyte. Background technique [0002] In the field of uranium conversion electrolysis to produce fluorine, the recovery and treatment methods of waste electrolyte mainly adopt heating concentration crystallization method and direct cooling crystallization method. According to different impurities, impurity removal treatment is required before crystallization. Impurities in water can be removed by dissolving in water and liquid-solid separation. However, for medium-temperature fluorine-producing electrolyzers, there are waste electrolytes that cannot run out of the system due to high content of iron and copper. This part of the electrolyte needs to be removed. The newly purchased electrolyte level can only be reached after sub-adjusting the pH. [0003] Due to the ab...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B15/08C25B1/245C30B7/04C30B29/12
CPCC25B15/08C25B1/245C30B7/04C30B29/12
Inventor 李帅胡锦明王超王剑卫瞿朝晖欧阳毅冯鹏程
Owner 中核二七二铀业有限责任公司
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