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Lithium carbonate production technology

A production process, lithium carbonate technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of poor control of impurity acid in the product, production method has no practical value, and the product cannot meet the industry standard, etc. , to achieve the effects of easy control of the reaction process, improvement of market competitiveness, and low cost

Active Publication Date: 2013-11-27
SICHUAN STATE LITHIUM MATERIALS
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  • Abstract
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  • Claims
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Problems solved by technology

[0002] There are two main types of traditional production of lithium carbonate. One is to generate lithium carbonate by direct reaction of lithium sulfate and sodium carbonate. This method produces battery-grade lithium carbonate. The mother liquor has a high content of acid radicals and cannot be recycled, but can only be used to produce lower The production cost of first-grade lithium carbonate products is high, and the impurity acid radicals in the product are not well controlled during the production process, resulting in products that do not meet industry standards
The second is to use lithium hydroxide and carbon dioxide to react to generate lithium carbonate, and use lithium hydroxide as a raw material to produce lithium carbonate. When the market price of lithium hydroxide is higher than or close to the price of lithium carbonate, this production method has no practical value

Method used

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  • Lithium carbonate production technology

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Effect test

Embodiment 1

[0024] Ingredients and its freezing: Will Li 2 Li with an O concentration of 50 g / L 2 SO 4 Solution 3m 3 , the mass fraction is 30% NaOH solution 1.3~1.4m 3 mix, gain 2 SO 4 and NaOH mixed solution. Freeze the mixed solution at -2°C to precipitate Na 2 SO 4 After the crystals are separated, LiOH solution is obtained, and the Li of LiOH solution 2 O concentration is 58g / L.

[0025] Lithium sinking: 1.5m 3 A saturated solution of sodium carbonate with a concentration of 285g / L was heated to 90°C, and 2m 3 LiOH solution, the reaction produces Li 2 CO 3 Liquid-solid mixture of precipitate and NaOH solution.

[0026] Will Li 2 CO 3 The liquid-solid mixture of the precipitate and NaOH solution was centrifuged to obtain Li 2 CO 3 Crude and Li 2 CO 3 Crude product, washed with water to remove Li 2 CO 3 Soluble impurity ions in the crude product to obtain purified Li 2 CO 3 Wet product; Will Li 2 CO 3 After the wet product is dried, lithium carbonate 261Kg is o...

Embodiment 2

[0028] Ingredients and its freezing: Will Li 2 The concentration of O is 50g / L of Li 2 SO 4 Solution 3m 3 , the mass fraction is 30% NaOH solution 1.3~1.4m 3 mix, gain 2 SO 4 and NaOH mixed solution. Freeze the mixed solution at -5°C to precipitate Na 2 SO 4 After the crystals are separated, LiOH solution is obtained, and the Li in LiOH solution 2 O concentration is 58g / L.

[0029] Lithium sinking: 1.5m 3 The saturated solution of sodium carbonate with a concentration of 285g / L was heated to 95°C, and 2.3m 3 LiOH solution, get the reaction to generate Li 2 CO 3 Liquid-solid mixture of precipitate and NaOH solution.

[0030] Will Li 2 CO 3 After centrifugation of the liquid-solid mixture of the precipitate and NaOH solution, the Li 2 CO 3 Soluble impurity ions in the crude product to obtain purified Li 2 CO 3 Wet product; Will Li 2 CO 3 After the wet product is dried, lithium carbonate 278Kg is obtained. The indicators of lithium carbonate are as follows: ...

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Abstract

The invention discloses a lithium carbonate production technology which comprises the following steps of: I, preparing a Li2SO4 and NaOH mixed solution, freezing, precipitating Na2SO4 crystals and then separating to obtain a LiOH solution; II, heating a saturated Na2CO3 solution to 90-95DEG C, adding the LiOH solution obtained from the step I into the saturated Na2CO3 solution to obtain a liquid-solid mixture of Li2CO3 precipitate generated from reaction and the NaOH solution; III, performing centrifugal separation on the liquid-solid mixture in the step II to obtain a crude Li2CO3 product and the NaOH solution; IV, washing off soluble impurity ions in the crude Li2CO3 product to obtain a purified wet Li2CO3 product; V, drying and packaging the wet Li2CO3 product. In the production technology, the LiOH solution can be prepared by preparing and freezing the mixed solution through taking Li2SO4 and NaOH as raw materials, the cost of the raw materials is low, and the problem that the cost is high by directly taking LiOH as a raw material can be solved; the by-product sodium hydroxide can be directly used in the technology for converting lithium sulfate into lithium hydroxide, so that the cost of the lithium hydroxide can be lowered, and the market competitiveness can be strengthened.

Description

technical field [0001] The invention relates to a production process of lithium carbonate. Background technique [0002] There are two main types of traditional production of lithium carbonate. One is to generate lithium carbonate by direct reaction of lithium sulfate and sodium carbonate. This method produces battery-grade lithium carbonate. The mother liquor has a high content of acid radicals and cannot be recycled, but can only be used to produce lower First-grade lithium carbonate products have high production costs, and the impurity acid radicals in the products are not well controlled during the production process, resulting in products that do not meet industry standards. The 2nd, generate lithium carbonate with lithium hydroxide and carbon dioxide reaction, produce lithium carbonate with lithium hydroxide as raw material, when lithium hydroxide market price is higher than or close to lithium carbonate price, this production method has no practical value. The qualit...

Claims

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Application Information

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IPC IPC(8): C01D15/08
Inventor 陈思伟张晓洪马玉全李强董兴旺张乔李梁赵江
Owner SICHUAN STATE LITHIUM MATERIALS
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