Battery-grade lithium carbonate preparation method

A lithium carbonate, battery-grade technology, applied in the direction of lithium carbonate;/acid carbonate, etc., to achieve the effect of easy industrial production, short process flow and low production cost

Active Publication Date: 2018-08-21
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Application Information

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The above technical methods have not been reported at home and abroad so far

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  • Battery-grade lithium carbonate preparation method

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Embodiment 1

[0030] Example 1 (including Example 1-1, 1-2, 1-3, 1-4)

[0031] with 1 # Lithium sulfate purification solution was used as raw material to prepare battery-grade lithium carbonate with Mg contents of 0.08%, 0.61%, 1.19%, and 1.74%, respectively. In this example, lithium carbonate is synthesized by adding lithium sulfate purification solution to soda ash solution.

Embodiment 1-1

[0033] Take Na 2 CO 3 Solution 0.73L (wherein, Na 2 CO 3 content of 298g / L, Mg content of 20mg / L, Ca content of 3mg / L; Na 2 CO 3 The dosage is 1.17 times of the stoichiometric amount, dissolved with 0.09g EDTA, 0.25g polyethylene glycol), added to the reaction kettle, and heated to 80°C; 1 # Add 1.5L of lithium sulfate purification solution into the reactor, the solution temperature is 20°C, add 0.36g of magnesium sulfate (containing 35mg of Mg), stir and dissolve. Then add the lithium sulfate purification solution to Na under stirring condition 2 CO 3 solution. After adding the lithium sulfate purification solution, raise the temperature to 85°C, continue to stir and react for 60 minutes, filter, and then fully wash the filter cake with 900mL of pure water at a temperature of 85°C, and then place the obtained lithium carbonate filter cake (containing 15% attached water) in Dry at 200°C to obtain 101.6g of battery-grade lithium carbonate product.

[0034] Li of the pr...

Embodiment 1-2

[0037] Take Na 2 CO 3 Solution 0.76L (wherein, Na 2 CO 3 content of 298g / L, Mg content of 20mg / L, Ca content of 3mg / L; Na 2 CO 3 The dosage is 1.20 times of the stoichiometric amount, dissolved with 0.13g EDTA, 0.30g polyethylene glycol), added to the reaction kettle, and heated to 90°C; 1 # Add 1.5L of lithium sulfate purification solution into the reactor, raise the temperature to 40°C, add 6.3g of magnesium sulfate (containing 0.61g of Mg), and stir to dissolve. Then add the lithium sulfate purification solution to Na under stirring condition 2 CO 3 solution. After adding the lithium sulfate purification solution, raise the temperature to 90°C, continue to stir and react for 50 minutes, filter, then fully wash the filter cake with 980mL of pure water at a temperature of 90°C, and then place the obtained lithium carbonate filter cake (containing 14% attached water) in Dry at 150°C to obtain 105.2g of battery-grade lithium carbonate product.

[0038] Li of the produc...

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Abstract

The invention discloses a battery-grade lithium carbonate preparation method, which comprises: removing impurities from a lithium sulfate solution produced by using lithium ore as a raw material to obtain a lithium sulfate purification liquid, adding the lithium sulfate purification liquid into a Na2CO3 solution with dissolved EDTA and polyethylene glycol under a stirring condition, or adding a Na2CO3 solution with dissolved EDTA and polyethylene glycol to the lithium sulfate purification liquid, carrying out a stirring reaction for 30-60 min at a temperature of 85-97 DEG C, filtering, washing, and drying to prepare the battery-grade lithium carbonate product with the Li2CO3 content of 93.1-99.4% and the Mg content of 0.02-1.75%. According to the present invention, the deep or multiple magnesium removal is not required, the high value of magnesium is achieved, the uniform doping of magnesium and rare earth in the lithium ion battery positive electrode material can be achieved, and theelectrical property of the lithium ion battery positive electrode material can be easily improved; and the method has characteristics of low production cost, short process flow, high performance priceratio of the product, easy industrial production and significant economic benefits.

Description

technical field [0001] The invention relates to a preparation method of lithium carbonate, an inorganic chemical product, in particular to a lithium sulfate solution produced from spodumene or lepidolite as a raw material, which is used as a positive electrode material for a lithium ion battery (lithium iron phosphate, lithium iron phosphate, Ternary material) Preparation method of battery-grade lithium carbonate of lithium source. Background technique [0002] Battery grade lithium carbonate (Li 2 CO 3 ) is an important inorganic chemical product, mainly used as a lithium source for the preparation of lithium ion battery cathode materials (lithium cobaltate, ternary materials, lithium iron phosphate, etc.). With the rapid development of the electronics and electric vehicle industries, the usage of battery-grade lithium carbonate is increasing rapidly. [0003] production of lithium carbonate lithium Ore (spodumene, lepidolite) and brine are raw materials. my country's ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 刘述平李超朱昌洛张贻周雄唐湘平
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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