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Method for separating lithium fluoride from electrolyte acid leaching solutions

An acid leaching solution, lithium fluoride technology, applied in the direction of improving process efficiency, can solve the problem of no separation and recovery of lithium fluoride and high recovery rate of lithium fluoride, and achieve the effects of reducing energy consumption, increasing benefits, and low extraction costs

Active Publication Date: 2018-04-20
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no method that can separate and recover lithium fluoride from the acid leaching solution of aluminum electrolyte and has a high recovery rate of lithium fluoride.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Get 100ml of nitric acid leaching solution (LiF content 5% in the raw material), put into beaker and heat and adopt electromagnetic stirring, neutralization temperature is 80 ℃, stirring speed is 300r / min, add the 4M sodium hydroxide solution that prepares afterwards, the hydroxide The adding speed of the sodium solution is automatically controlled by the program, and the acidity change and the fluoride ion concentration change during the neutralization process are monitored by the acidity meter and the fluoride ion selective electrode. When the pH value of the solution was 6.8, and the fluoride ion concentration was 0.07g / L, stop adding the sodium hydroxide solution; finally, the mixed solution was filtered to obtain the filter residue and filtrate, and the filter residue was washed with water three times, and after drying, it was obtained that the purity was 93.7%. Cryolite products.

[0050] Put the filtrate into the evaporator for evaporation, monitor the fluoride i...

Embodiment 2

[0052] Get 1500ml of nitric acid leaching solution (LiF content 4% in the raw material), put into the neutralization tank and heat and adopt electric stirring, the neutralization temperature is 50 ℃, and the stirring speed is 200r / min, then add the prepared 4M sodium hydroxide solution, The adding speed of the sodium hydroxide solution is automatically controlled by the program, and at the same time, the acidity change and the fluoride ion concentration change in the neutralization process are monitored by using a acidity meter and a fluoride ion selective electrode. When the pH value of the solution was 7.5 and the fluoride ion concentration was 0.06g / L, stop adding sodium hydroxide solution; finally, the mixed solution was filtered to obtain the filter residue and filtrate, and the filter residue was washed with water three times, and after drying, it was obtained that the purity was 92.4%. Cryolite products.

[0053] Put the filtrate into the evaporator for evaporation, mon...

Embodiment 3

[0055] Take 150L of nitric acid leaching solution (LiF content 7% in the raw material), put it into a neutralization tank and heat it with electric stirring, the neutralization temperature is 40°C, and the stirring speed is 500r / min, then add the prepared 4M sodium hydroxide solution, The adding speed of the sodium hydroxide solution is automatically controlled by the program, and at the same time, the acidity change and the fluoride ion concentration change in the neutralization process are monitored by using a acidity meter and a fluoride ion selective electrode. When the pH value of the solution was 8.7, and the fluoride ion concentration was 0.07g / L, stop adding the sodium hydroxide solution; finally, the mixed solution was filtered to obtain the filter residue and filtrate, and the filter residue was washed with water three times, and after drying, it was obtained that the purity was 94.9%. Cryolite products.

[0056] Put the filtrate into the evaporator for evaporation, ...

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Abstract

The invention discloses a method for separating lithium fluoride from electrolyte acid leaching solutions, and relates to the technical field of extraction of lithium elements from aluminum electrolyte. The method comprises the following steps of S1, preparing alkali liquor for standby application; S2, adding the alkali liquor to aluminum electrolyte acid leaching solutions for neutral reaction, monitoring the fused salt acidity and fluoride concentration in the adding process, and stopping adding the alkali liquor when the PH value is larger than 6 and the fluoride concentration is lower than0.08 g / L; S3, filtering the mixed liquor, and washing and drying filter residues to obtain cryolite products; evaporating and crystallizing filter liquor, and stopping evaporating the filter liquor when the fluoride concentration is monitored to be lower than 0.02 g / L; and S4, filtering the solutions after evaporation, and washing and drying filter cakes to obtain lithium fluoride; evaporating, crystallizing, washing and drying the filter liquor to obtain inorganic salt. According to the method disclosed by the invention, the reaction process is controlled by controlling the fluoride concentration and the acidity, so that lithium ions and other ions are separated to obtain the lithium fluoride with high recovery rate; and meanwhile, cryolite and inorganic salt products with high purity are obtained.

Description

technical field [0001] The invention relates to the technical field of extracting lithium elements from aluminum electrolytes, and relates to a method for separating lithium fluoride from aluminum electrolyte acidic leaching solutions. Background technique [0002] With the rapid development of my country's electrolytic aluminum industry, the demand for bauxite resources has increased sharply. my country's high-grade bauxite is already facing depletion, and only a large amount of low-grade bauxite is mined and utilized to produce 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 a raw material for electrolytic aluminum production, which leads to changes in the electrolyte composition in the aluminum electrolytic cell, and a large amount of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/44C22B3/06C22B26/12
CPCC22B3/06C22B3/44C22B7/007C22B26/12Y02P10/20
Inventor 王兆文陶文举杨酉坚石忠宁
Owner NORTHEASTERN UNIV
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