Method for extracting lithium from magnesium-removal bittern and preparing battery-grade lithium carbonate

A battery-grade, lithium carbonate technology, applied in the direction of lithium carbonate; Utilization rate and effect of small loss of lithium

Active Publication Date: 2017-08-15
青海西部镁业新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese Patent Publication No. CN 105152193 A is an industrial method for extracting magnesium and lithium from brine and producing hydrotalcite at the same time. There is no research on the preparation of lithium carbonate. The mother liquor after the preparation of magnesium aluminum hydrotalcite contains various ions, especially high content of sodium ions , cannot be directly used in the production of products such as lithium carbonate
[0006] Chinese Patent Publication No. CN 105036159 A is a method for preparing lithium carbonate from high-lithium salt lake brine, adding additives, complexing agents and precipitating agents when preparing lithiu

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  • Method for extracting lithium from magnesium-removal bittern and preparing battery-grade lithium carbonate
  • Method for extracting lithium from magnesium-removal bittern and preparing battery-grade lithium carbonate
  • Method for extracting lithium from magnesium-removal bittern and preparing battery-grade lithium carbonate

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Example Embodiment

[0040] Example 1

[0041] A. Take 250mL of high sodium brine after magnesium removal, in which the mass ratio of sodium to lithium is about 48, and add AlCl 3 ·6H 2 O 11.741g to obtain mixed salt solution A;

[0042] B. Weigh 4.3767g of NaOH, Na 2 CO 3 5.1548g, dissolved in deionized water, constant volume in a 250mL volumetric flask to obtain mixed alkali solution B;

[0043] C. Pour the mixed salt solution A and mixed alkali solution B into the colloid mill at the same time, and rotate at 3000r / min for 3 minutes to form magnesium-doped lithium aluminum composite hydroxide crystal nucleus; transfer the crystal nucleus solution to the reactor, Dynamically stir and crystallize at 80°C for 12 hours for growth;

[0044] D. Solid-liquid separation and filtration to obtain a lithium aluminum composite hydroxide filter cake. The lithium aluminum composite hydroxide filter cake is dried at 70°C for 12 hours to obtain a white solid product. The chemical formula is [LiAl 2 (OH) 6 ] 2 CO 3 ·3H...

Example Embodiment

[0050] Example 2

[0051] A. Take 250mL of high sodium brine after magnesium removal, in which the mass ratio of sodium to lithium is about 48, and add Al(NO 3 ) 3 ·9H 2 O18.243g to obtain mixed salt solution A;

[0052] B. Weigh 4.3766g of NaOH, Na 2 CO 3 5.1548g, dissolved in deionized water, constant volume in a 250mL volumetric flask to obtain mixed alkali solution B;

[0053] C. Pour the mixed salt solution A and mixed alkali solution B into the colloid mill at the same time, and rotate at 3000r / min for 3 minutes to form magnesium-doped lithium aluminum composite hydroxide crystal nucleus; transfer the crystal nucleus solution to the reactor, Dynamically stir and crystallize at 80°C for 12 hours for growth;

[0054] D. Solid-liquid separation and filtration to obtain a lithium aluminum composite hydroxide filter cake. The lithium aluminum composite hydroxide filter cake is dried at 70°C for 12 hours to obtain a white solid product. The chemical formula is [LiAl 2 (OH) 6 ] 2 CO 3...

Example Embodiment

[0060] Example 3

[0061] A. Take 250mL of high sodium brine after magnesium removal, in which the mass ratio of sodium to lithium is about 48, add Al 2 (SO 4 ) 3 ·18H 2 O32.396g to obtain mixed salt solution A;

[0062] B. Weigh 4.3769g of NaOH, Na 2 CO 3 5.1548g, dissolved in deionized water, constant volume in a 250mL volumetric flask to obtain mixed alkali solution B;

[0063] C. Pour the mixed salt solution A and mixed alkali solution B into the colloid mill at the same time, and rotate at 3000r / min for 3 minutes to form magnesium-doped lithium aluminum composite hydroxide crystal nucleus; transfer the crystal nucleus solution to the reactor, Dynamically stir and crystallize at 80°C for 12 hours for growth;

[0064] D. Solid-liquid separation and filtration to obtain a lithium aluminum composite hydroxide filter cake. The lithium aluminum composite hydroxide filter cake is dried at 70°C for 12 hours to obtain a white solid product. The chemical formula is [LiAl 2 (OH) 6 ] 2 CO 3...

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Abstract

The invention discloses a method for extracting lithium from magnesium-removal bittern and preparing battery-grade lithium carbonate. The method uses a reaction-separating coupling technology for separating, extracting a lithium resource from magnesium-removal bittern and generating the battery-grade lithium carbonate, a technology comprises the following steps: aluminium salt is added in high sodium bittern after magnesium removal, and steps of nucleation and crystallization are carried out with alkali lye in a colloid grinder to obtain a lithium-aluminium composite metal hydroxide solid, lithium ions are introduced into a solid phase, the sodions stay in a solution, so that lithium ions and sodions are effectively separated. The lithium-aluminium composite metal hydroxide is dissolved by acid to obtain a solution containing lithium ions and aluminum ions, then lithium and aluminium are separated by an electrodialysis apparatus, the separated solution containing aluminium can be recycled, a lithium-rich solution is subjected to a precipitation reaction, and the battery-grade lithium carbonate is obtained. A reaction-separation coupling technology is used, while lithium and sodium are separated, the battery-grade lithium carbonate is prepared, so that high efficiency and high value utilization of the salt lake lithium resource can be realized.

Description

technical field [0001] The invention relates to the field of utilization of brine resources, in particular to a process for separating and extracting lithium resources in salt lake brine after magnesium removal by using reaction-separation coupling technology and producing battery-grade lithium carbonate. Background technique [0002] Salt lakes usually refer to lakes with a salt content greater than 50g·L -1 lakes, which contain a large amount of Cl - , SO 4 2- 、HCO 3 - , CO 3 2- 、Na + 、K + , Mg + , Li + Ions, with a salt content exceeding 24.7‰, are important raw materials for the production of various industrial and agricultural products. As the amount of lithium used in traditional applications continues to grow, people are also continuing to develop new applications, and the demand for lithium resources is also increasing. As a new type of energy and strategic resource, lithium has attracted much attention in the 21st century. China's salt lake lithium reso...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 项顼郭晓雨段雪
Owner 青海西部镁业新材料有限公司
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