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Electrolytic fluorine waste electrolyte recovery method

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

Active Publication Date: 2020-04-17
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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  • Electrolytic fluorine waste electrolyte recovery method

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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 uranium conversion electrolysis fluorine production, and particularly relates to an electrolysis fluorine production waste electrolyte recovery method.The method comprises the following steps: (1) dissolving a waste electrolyte; (2) carrying out pH adjustment; and (3) carrying out crystallization of potassium bifluoride. Dissolving and filtering canbe adopted to obtain a clear electrolyte dissolved solution, copper is removed, the pH value is controlled to be 10 to 12, and is adjusted to be 3 to 4 before crystallization, the recovered electrolyte with indexes similar to those of newly purchased electrolyte can be prepared. Through research, alkaline wastewater and acidic wastewater treated by an electrolytic cathode can be used for dissolving the waste electrolyte, and the ion product of potassium bifluoride during electrolyte crystallization can be increased by adjusting the pH value.

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 Applications(China)
IPC IPC(8): C25B15/08C25B1/24C30B7/04C30B29/12
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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