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Method for preparing additive agent electrolyte for electrolyzing aluminium from lithium-containing waste liquid

A technology for waste liquid and aluminum electrolysis, which is applied in the field of preparing aluminum electrolytic electrolyte additives, can solve the problems of complex process flow, hidden dangers of environmental protection, low recovery efficiency, etc., and achieves the effects of short process flow, convenient production scale adjustment and high recovery rate.

Inactive Publication Date: 2008-11-19
GUIZHOU BRANCH CHINA ALUMINUM IND
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AI Technical Summary

Problems solved by technology

[0004] At present, the main treatment methods of lithium-containing waste liquid are mainly chemical deposition and extraction, purification and recovery processes. The common problems of these processes are complicated process flow, low recovery efficiency, high recovery cost, and hidden dangers in environmental protection.

Method used

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  • Method for preparing additive agent electrolyte for electrolyzing aluminium from lithium-containing waste liquid
  • Method for preparing additive agent electrolyte for electrolyzing aluminium from lithium-containing waste liquid
  • Method for preparing additive agent electrolyte for electrolyzing aluminium from lithium-containing waste liquid

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Embodiment

[0018] 1. Treatment of catalyst waste liquid

[0019] A factory uses lithium metal to produce n-butyllithium, and produces a waste liquid containing a mixture of lithium chloride and lithium hydroxide. The typical composition is: lithium chloride: 80%, lithium hydroxide: 15%, and the others are impurities. The specific process plan is as follows:

[0020] Main process conditions:

[0021] Precipitation by adding sodium carbonate: 110% to 120% of the chemical reaction volume;

[0022] Reaction temperature: 70~90℃, reaction time 2~3h;

[0023] Drying temperature: 300~450℃;

[0024] Primary recovery rate of lithium: >50%;

[0025] Lithium recycling rate: >95%.

[0026] 2. Chemical raw material lithium halide waste liquid treatment

[0027] LiCl aqueous solution is often used as a desiccant in desiccant cooling systems, and its regeneration after disposal is also a difficult problem. The concentration of LiCl in the waste liquid is between 20% and 25%, and a small amount of...

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Abstract

The invention relates to a method for preparing an additive for aluminum electrolysis electrolytes by lithium-containing waste liquid. The method is characterized in that in the preparation process, the lithium-containing waste liquid are filtered and added with sodium carbonates for precipitation reaction, and the mixed liquid are filtered and dried to be used as the additive for aluminum electrolysis electrolytes. In the method of the invention, the scale of production is conveniently adjusted and raw materials are good in adaptability; simultaneously the product of the invention is a complex additive of a plurality of substances, thereby reducing technological process, lowering technological requirement, greatly lowering manufacturing cost and improving recovery ratio of resources; compared with the prior process of preparing the additive for aluminum electrolysis electrolytes by directly utilizing carbonates and fluoride salts, the technical proposal of the invention has the advantages of cheap material, resource conservation, cyclic utilization of resources, short technological process, simple operation and high recovery ratio.

Description

technical field [0001] The invention relates to a method for preparing an aluminum electrolytic electrolyte additive by using lithium-containing waste liquid. Background technique [0002] Aluminum electrolysis has been produced using the traditional Hall-Hoult process, and all electrolytes use sodium cryolite-based fluoride. Although the sodium cryolite electrolyte system has the advantages of high current efficiency and high alumina solubility, it has problems such as high electrolysis temperature and high energy consumption. At present, a small amount of alkali metal or alkaline earth metal fluoride or carbonate is mainly added as additives in production, especially lithium fluoride and lithium carbonate, in order to achieve the purpose of lowering the electrolysis temperature, improving conductivity and reducing energy consumption. However, due to the high unit cost of the application of lithium salt additives, large-scale industrial applications are affected. [0003]...

Claims

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Application Information

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IPC IPC(8): C25C3/18
Inventor 黄海波
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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