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Method for extracting lithium salt from aluminum electrolyte by utilizing fluoride roasting and acid leaching

An aluminum electrolyte and acid leaching technology, which is applied in the direction of improving process efficiency, can solve the problems of 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: 2016-05-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for extracting lithium salt from aluminum electrolyte by utilizing fluoride roasting and acid leaching
  • Method for extracting lithium salt from aluminum electrolyte by utilizing fluoride roasting and acid leaching
  • Method for extracting lithium salt from aluminum electrolyte by utilizing fluoride 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

The invention discloses a method for extracting lithium salt from aluminum electrolyte by utilizing fluoride roasting and acid leaching, and belongs to the technical field of inorganic chemistry. The method comprises the following steps: step 1: mixing materials; and step 2: carrying out fluoride roasting; and step (3): (1) carrying out acid leaching and filtering to obtain primary filtrate and primary filtered substances; (2) respectively treating the primary filtrate and the primary filtered substances to obtain secondary filtrate and secondary filtered substances; (3) respectively treating the secondary filtrate and the secondary filtered substances to obtain tertiary filtrate and tertiary filtered substances; and (4) respectively treating the tertiary filtrate and the tertiary filtered substances. According to the method disclosed by the invention, an element lithium in the electrolyte can be effectively extracted, so that energy consumption for electrolytic aluminum production is reduced; lithium carbonate chemical raw materials with a high additional value are recycled, and the used raw materials are common raw materials in the chemical field, so that the comprehensive average extraction cost is relatively low; various substances can be separated out, and the obtained substances are relatively high in purity; and the lithium element influence problem is solved for the aluminum electrolysis industry, benefits are increased, and the comprehensive level of the aluminum electrolysis industry in China is improved.

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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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
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