Method for separating lithium carbonate from electrolyte acidic leachate

A technology of acidic leaching solution and lithium carbonate, which is applied in the preparation of sulfate/bisulfate, lithium carbonate;/acid carbonate, alkali metal nitrate, etc. Lithium recovery rate is high, to achieve the effect of reducing energy consumption, low extraction cost, and increasing resources

Inactive 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 carbonate from the acid leaching solution of aluminum electrolyte and have a high recovery rate of lithium carbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Get 100ml of nitric acid leaching solution (LiF content 5% in the raw material), put into beaker and heat and adopt electromagnetic stirring, and neutralization temperature is 80 ℃, and stirring speed is 300r / min, adds calcium nitrate solution at a uniform speed with suitable speed, the calcium nitrate solution The adding speed is automatically controlled by the program, and at the same time, the pH meter and the fluoride ion selective electrode are used to monitor the change of acidity and fluoride ion concentration during the neutralization process. When the pH of the solution is 5.5 and the fluoride ion concentration is 0.01g / L, stop adding the calcium nitrate solution; then filter the mixed solution to obtain the filter residue and filtrate, wash the filter residue three times with water, and dry to obtain fluorine with a purity of 95.8%. Calcium.

[0052] Put the filtrate into the reaction kettle, heat and use electromagnetic stirring, the reaction temperature is 5...

Embodiment 2

[0054] Take 1500ml of nitric acid leaching solution (the content of LiF in the raw material is 4%), put it into the neutralization tank and heat it with electric stirring. The adding speed of the 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 is 6.3 and the fluoride ion concentration is 0.008g / L, stop adding the magnesium nitrate solution; then filter the mixed solution to obtain the filter residue and filtrate, the filter residue is washed with water three times, and the fluorine with a purity of 98.4% is obtained after drying. magnesium oxide.

[0055] Put the filtrate into the reaction kettle, heat and use electric stirring, the reaction temperature is 65°C, the stirring speed is 300r / min, and a sodium carbonate solution with a concentration of 1...

Embodiment 3

[0057] Take 150L of sulfuric acid leaching solution (the content of LiF in the raw material is 7%), put it into the neutralization tank to heat and use electric stirring, the neutralization temperature is 40°C, the stirring speed is 200r / min, add the aluminum nitrate solution at a uniform speed at an appropriate speed, aluminum nitrate The adding speed of the 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 of the solution is 6.5 and the fluoride ion concentration is 0.003g / L, stop adding the aluminum nitrate solution; then filter the mixed solution to obtain the filter residue and filtrate, wash the filter residue three times with water, and dry to obtain fluorine with a purity of 96.5%. Aluminum.

[0058] Put the filtrate into the reaction kettle, heat and use electric s...

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PUM

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Abstract

The invention discloses a method for separating lithium carbonate from electrolyte acidic leachate. The method comprises the following steps of: S1, adding a soluble salt solution to aluminum electrolyte acidic leachate while stirring and heating are performed, monitoring the acidity and the concentration of fluoride ions, and stopping the addition when the pH value is greater than 5 and the concentration of the fluoride ions is less than 0.01 g/L, wherein the soluble salt is one or more selected from MeSO4, MeNO3 and MeCl, and Me is metal which can produce precipitate with F<->; S2, performing filtration on reactants, performing washing and drying on filter residues to obtain a fluoride salt of the metal Me, adding a soluble carbonate solution into the obtained filtrate with stirring andheating, and terminating the reaction when the concentration of lithium ions is less than 0.08 g/L; S3, filter the filtrate, performing washing and drying on the filter cake to obtain lithium carbonate, and performing evaporation, crystallization, washing and drying on the filtrate to obtain inorganic salts. According to the method for separating lithium carbonate from the electrolyte acidic leachate, the reaction process is controlled by controlling the concentration of the fluoride ions and the acidity, so that the lithium ions are separated from other ions, lithium carbonate with high recovery rate is obtained, and meanwhile high-purity fluoride and inorganic salt products are obtained.

Description

technical field [0001] The invention relates to the technical field of extracting lithium elements from an aluminum electrolyte, and relates to a method for separating lithium carbonate from an aluminum electrolyte acidic leaching solution. 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 amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/22C01F5/28C01F7/50C01F7/54C01D15/08C01D3/04C01D9/08C01D5/06
CPCC01D3/04C01D5/06C01D9/08C01D15/08C01F5/28C01F7/50C01F7/54C01F11/22C01P2006/80
Inventor 王兆文陶文举
Owner NORTHEASTERN UNIV
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