A method for extracting lithium salt in aluminum electrolyte by fluorination roasting and acid leaching

An aluminum electrolyte and acid leaching technology, which is applied in the direction of improving process efficiency, can solve problems such as reduced service life of electrolytic cells, reduced alumina solubility, and damaged carbon materials, and achieves low extraction costs, reduced energy consumption, and improved comprehensive performance. horizontal effect
CN105543504BActive Publication Date: 2017-06-20NORTHEASTERN UNIV LIAONING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHEASTERN UNIV LIAONING
Publication Date
2017-06-20

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Abstract

A method for extracting lithium salt in an aluminum electrolyte by fluorination roasting and acid leaching, belonging to the technical field of inorganic chemistry, comprising the following steps: step 1: mixing materials; step 2: fluorination roasting; step 3: (1) acid leaching, Filter to obtain primary filtrate and primary filtrate; (2) process primary filtrate and primary filtrate respectively to obtain secondary filtrate and secondary filtrate; (3) process secondary filtrate and secondary filtrate respectively to obtain three times filtrate and Three times of filtrate; (4) process three times of filtrate and three times of filtrate respectively. The method of the present invention can effectively extract the lithium element in the electrolyte, reduce the energy consumption of electrolytic aluminum production; recycle high value-added lithium carbonate chemical raw materials, all of which are common raw materials in the chemical industry, and the comprehensive average extraction cost is low; can separate a variety of Substances, the purity of the obtained substances is high; it solves the problem of the influence of lithium elements for the aluminum electrolysis industry, also increases the benefits, and improves the comprehensive level of my country's aluminum electrolysis industry.
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Description

technical field

[0001] The invention belongs to the technical field of inorganic chemistry, and in particular relates to a method for extracting lithium salt in an aluminum electrolyte by fluorination roasting and acid leaching. Background technique

[0002] In recent years, with the rapid development of my country's electrolytic aluminum industry, the demand for bauxite resources has increased sharply. Therefore, a large amount of middle and low grade bauxite is mined and used to prepare metallurgical grade alumina. This medium and low-grade bauxite contains a large amount of alkali metal elements, especially the bauxite in the main production areas of bauxite in my country has a high content of lithium salt. A large amount of alumina containing lithium salts is used as raw material for electrolytic aluminum production. This aluminum oxide is added to the electrolyte, and the lithium salt also enters the aluminum electrolytic cell along with it, and continues to accumulat...

Claims

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