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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

Active Publication Date: 2017-06-20
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the purpose of extracting the lithium salt in the aluminum electrolyte, the present invention successfully researches the process of extracting the lithium element in the aluminum electrolyte by the fluorination roasting acid leaching method, and solves the problem of high superheat in aluminum electrolysis production caused by excessive lithium concentration for the aluminum electrolysis industry. A series of problems such as reduced alumina solubility, damaged carbon materials, and reduced service life of the electrolytic cell have been obtained, and lithium carbonate products have been obtained, which not only increases production efficiency, but also provides practical solutions for electrolytic aluminum production under complex electrolyte systems method

Method used

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

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Embodiment 1

[0043] The method of utilizing fluorination roasting and acid leaching to extract the lithium salt in the aluminum electrolyte of this embodiment comprises the following steps:

[0044] Step 1: Pulverize 10 g of aluminum electrolyte containing lithium, add sodium fluoride to obtain a mixed material, and mix evenly, wherein the molar ratio of sodium fluoride to aluminum fluoride in the mixed material is 3:1;

[0045] Step 2: heat the mixed material at 400°C for 3 hours; after cooling down to room temperature, pulverize the mixed material;

[0046] Step 3:

[0047] (1) At 20°C, add HNO with a concentration of 14mol / L and a volume of 100ml to the mixed material 3 Solution, wherein, the quality of the aluminum electrolyte: the volume of the acid solution = 100g / L; the stirring speed is 100r / min, stirring for 30min, during the stirring process, add water to the reaction solution to keep the volume of the reaction solution constant, filter to obtain a filtrate and primary filtrate...

Embodiment 2

[0059] The method of utilizing fluorination roasting and acid leaching to extract the lithium salt in the aluminum electrolyte of this embodiment comprises the following steps:

[0060] Step 1: Grinding 5 g of aluminum electrolyte containing lithium, adding sodium fluoride to obtain a mixed material, and mixing evenly, wherein the molar ratio of sodium fluoride to aluminum fluoride in the mixed material is 3.5:1;

[0061] Step 2: heat the mixed material at 1000°C for 2 hours; after cooling down to room temperature, pulverize the mixed material;

[0062] Step 3:

[0063] (1) At 100°C, add HNO with a concentration of 14mol / L and a volume of 50ml to the mixed material 3 Solution, wherein, the quality of the aluminum electrolyte: the volume of the acid solution = 100g / L; the stirring speed is 300r / min, stirring for 180min, during the stirring process, add water to the reaction solution to keep the volume of the reaction solution constant, filter to obtain a filtrate and primary ...

Embodiment 3

[0075] The method of utilizing fluorination roasting and acid leaching to extract the lithium salt in the aluminum electrolyte of this embodiment comprises the following steps:

[0076] Step 1: Pulverize 65g of aluminum electrolyte containing lithium, add sodium fluoride to obtain a mixed material, and mix evenly, wherein the molar ratio of sodium fluoride to aluminum fluoride in the mixed material is 4:1;

[0077] Step 2: heat the mixed material at 500°C for 3 hours; after cooling down to room temperature, crush the mixed material;

[0078] Step 3:

[0079] (1) At 80°C, add H with a concentration of 9mol / L and a volume of 1000ml to the mixed material 2 SO 4 Solution, wherein, the quality of the aluminum electrolyte: the volume of the acid solution = 65g / L; the stirring speed is 250r / min, stirring for 120min, during the stirring process, add water to the reaction solution to keep the volume of the reaction solution constant, filter to obtain a filtrate and primary filtrate;...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/12C22B7/00
CPCC22B7/006C22B26/12Y02P10/20
Inventor 王兆文侯剑峰石忠宁胡宪伟高炳亮于江玉
Owner NORTHEASTERN UNIV LIAONING
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