Method for extracting lithium from alumina production process and preparing battery-grade lithium carbonate

A production process, lithium carbonate technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, lithium carbonate;/acid carbonate, aluminate/alumina/aluminum hydroxide purification, etc. Direction, can solve the problems of high cost, lengthy lithium recovery process, low recovery rate, etc., and achieve the effect of low cost, low investment, and high-efficiency desorption

Active Publication Date: 2019-12-31
GUIZHOU BRANCH CHINA ALUMINUM IND
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Problems solved by technology

[0010] In order to solve the problems of long lithium recovery process, low recovery rate and high cost in the prior art, at the same time provide a practical method for the production of battery-grade lithium carbonate for alumina enterprises using high-lithium bauxite as raw material, and provide a solution for complex components The high-efficiency recovery of valuable metals in bauxite opens up a new technical route. The invention provides a method for extracting lithium from the alumina production process and preparing battery-grade lithium carbonate

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  • Method for extracting lithium from alumina production process and preparing battery-grade lithium carbonate

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Embodiment 1

[0037] Na 2 o k The concentration is 100g / L, α k =2.2, Li + The sodium aluminate solution with a concentration of 0.04g / L reacted with 1.0g / L aluminum hydroxide active seed crystals at a temperature of 80°C for 180min, the average particle size of the aluminum hydroxide active seed crystals was 2.0μm, and the removal of lithium The rate is 95.0%, and the active crystals of aluminum hydroxide are enriched through three cycles to obtain lithium-rich aluminum hydroxide, and the lithium content in the lithium-rich aluminum hydroxide is 0.5%. Lithium-rich aluminum hydroxide is washed and immersed in formic acid with a concentration of 0.1mol / L to make a slurry. The liquid-solid ratio of formic acid to lithium-rich aluminum hydroxide is 1, and the slurry is placed in a microwave reactor for lithium desorption. For the reaction, the frequency of the microwave reactor is 1500 MHz, the desorption reaction conditions are as follows: the reaction temperature is 50° C., the microwave r...

Embodiment 2

[0039] Na 2 o k The concentration is 110g / L, α k =2.1, Li +The sodium aluminate solution with a concentration of 0.04g / L reacted with 1.0g / L aluminum hydroxide active seed crystals at a temperature of 80°C for 180min, the average particle size of the aluminum hydroxide active seed crystals was 2.0μm, and the removal of lithium The rate is 95.2%. After the active crystals of aluminum hydroxide are enriched through three cycles, lithium-rich aluminum hydroxide is obtained, and the lithium content in the lithium-rich aluminum hydroxide is 0.5%. Lithium-rich aluminum hydroxide is washed and immersed in formic acid with a concentration of 0.3mol / L to make a slurry. The liquid-solid ratio of formic acid to lithium-rich aluminum hydroxide is 1.5. The slurry is placed in a microwave reactor for lithium desorption For the reaction, the frequency of the microwave reactor is 1500 MHz, the desorption reaction conditions are as follows: the reaction temperature is 60° C., the microwave ...

Embodiment 3

[0041] Na 2 o k The concentration is 120g / L, α k =2.0, Li + The sodium aluminate solution with a concentration of 0.05g / L reacted with 1.0g / L aluminum hydroxide active seed crystals at a temperature of 80°C for 180min, the average particle size of the aluminum hydroxide active seed crystals was 2.0μm, and the removal of lithium The rate is 95.4%. After the active crystals of aluminum hydroxide are enriched through three cycles, lithium-rich aluminum hydroxide is obtained, and the lithium content in the lithium-rich aluminum hydroxide is 0.6%. Lithium-rich aluminum hydroxide is washed and immersed in formic acid with a concentration of 0.5mol / L to make a slurry. The liquid-solid ratio of formic acid to lithium-rich aluminum hydroxide is 2. The slurry is placed in a microwave reactor for lithium desorption For the reaction, the frequency of the microwave reactor is 1500 MHz, the desorption reaction conditions are as follows: the reaction temperature is 70° C., the microwave r...

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Abstract

The invention relates to a method for extracting lithium from an alumina production process and preparing battery-grade lithium carbonate. The method comprises the following steps of: cooling a refined solution, and carrying out a reaction with an acidic compound to prepare an aluminum hydroxide active seed crystal; then, mixing the active seed crystal with a sodium aluminate solution to enrich lithium in the sodium aluminate solution to obtain lithium-rich aluminum hydroxide; mixing the lithium-rich aluminum hydroxide and an organic acid to carry out a microwave desorption reaction, and carrying out solid-liquid separation after the reaction is completed, wherein the solid is lithium-free aluminum hydroxide and the liquid is lithium-rich desorption liquid; adding alkali liquor to the lithium-rich desorption solution to adjust the pH value, and adding a lithium purification inhibition agent to remove aluminum ions, iron ions, calcium ions and magnesium ions to obtain a lithium-rich refined solution; and adding a saturated sodium carbonate solution to the lithium-rich refined solution to precipitate lithium to obtain crude lithium carbonate, and repeatedly the washing crude lithiumcarbonate with high-purity water to obtain the battery-grade lithium carbonate. The method realizes high-efficiency high-quality extraction of lithium in the alumina production process, and is in seamless connection with the existing alumina production process. The method has a simple process and low production cost and is suitable for industrial promotion.

Description

technical field [0001] The invention belongs to the field of lithium salt preparation, in particular to a method for extracting lithium from an alumina production process and preparing battery-grade lithium carbonate. Background technique [0002] Lithium carbonate is the basic material for the production of secondary lithium salt and lithium metal, therefore, it has also become the most basic and important product in the lithium industry. Not only can it be directly used as a product, but it can also be used to produce lithium alloys and lithium compounds. Lithium carbonate is widely used in electronic materials, chemistry, medical treatment, industrial ceramics, metallurgy and many other fields. With the rapid development of high-tech industries such as information technology, electric vehicles, and green energy, the market demand for lithium and its compounds is increasing day by day. The demand has exceeded the supply and the price remains high. Domestic high-quality l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01F7/14C01F7/46
CPCC01D15/08C01F7/14C01F7/46C01P2006/80Y02P10/20
Inventor 韩东战齐利娟宋二伟武国宝
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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