Method for preparing low-magnetism high-purity lithium carbonate by using saline lithium salt

A technology of high-purity lithium carbonate and lithium carbonate, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problem of high content of lithium carbonate impurities and magnetic substances, lithium carbonate industry does not have international competitiveness, and application value It is not as good as high-purity lithium carbonate and other problems, and achieves the effects of less magnetic substance content, low production cost, and short production cycle

Active Publication Date: 2015-03-04
JINCHUAN GROUP LIMITED
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Problems solved by technology

However, most methods have complex production and processing techniques, high cost, low resource utilization rate, high content of lithium carbonate impurities and magnetic substances produced, and cannot directly produce battery-grade lithium carbonate and high-purity lithium carbonate.
[0003] Most domestic lithium carbonate manufacturers can only provide low-purity industrial lithium carbonate, and some powerful manufacturers can provide battery-grade lithium carbonate. Their actual application value is far inferior to high-purity lithium carbonate, which directly leads to my country's Lithium carbonate industry does not have international competitiveness

Method used

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  • Method for preparing low-magnetism high-purity lithium carbonate by using saline lithium salt

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Effect test

Embodiment 1

[0028] A method for preparing low-magnetic high-purity lithium carbonate with salt lake lithium salt, comprising the following steps:

[0029] (1) Slurry: Weigh a certain amount of salt lake lithium salt, add it into a slurry container filled with tap water at 60°C according to the liquid-solid mass ratio of 2:1, and carry out stirring slurry;

[0030] (2) Counter-current washing: Put the salt lake lithium salt slurry obtained in step (1) into a constant temperature water bath for counter-current washing, using a single step-by-step washing, the mass ratio of washing liquid to solid is 3:1, and the washing temperature is 60°C. The time is 30 minutes, the number of washings is 2 times, and the total washing water volume to liquid-solid mass ratio is 4:1;

[0031] (3) Bicarbonation: Add the salt lake lithium salt washed in step (2) into tap water and put it into a beaker to stir, the liquid-solid mass ratio is 20:1, the reaction temperature is 20°C, the hydrogenation reaction ti...

Embodiment 2

[0040] A method for preparing low-magnetic high-purity lithium carbonate with salt lake lithium salt, comprising the following steps:

[0041] (1) Slurry: Weigh a certain amount of salt lake lithium salt, add it into a slurry container filled with 90°C tap water at a liquid-to-solid mass ratio of 6:1, and carry out stirring and slurrying;

[0042] (2) Countercurrent washing: Put the salt lake lithium salt slurry obtained in step (1) into a constant temperature water bath for countercurrent washing, using a single step-by-step washing, the mass ratio of washing liquid to solid is 8:1, and the washing temperature is 90 ° C. The time is 60 minutes, the number of washings is 8 times, and the total washing water volume and liquid-solid mass ratio are 7:1;

[0043] (3) Bicarbonation: Add the salt lake lithium salt washed in step (2) into tap water and put it into a beaker to stir, the liquid-solid mass ratio is 27:1, the reaction temperature is 40°C, the hydrogenation reaction time ...

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Abstract

The invention belongs to the technical field of lithium carbonate preparation, and discloses a method for preparing low-magnetism high-purity lithium carbonate by using saline lithium salt. The method using the saline lithium salt as a raw material mainly comprises the following steps: pulping the saline lithium salt, carrying out countercurrent washing, hydrogenating carbonic acid, removing magnetic substances, carrying out resin purification to remove impurities, carrying out evaporative crystallization, refining, calcining, and crushing to prepare the low-magnetism high-purity lithium carbonate product. The purity of the lithium carbonate product prepared through the method is 99.95-99.98%, and the contents of magnetic Fe, magnetic Cr and magnetic Zn in the product are not greater than 0.081g/t, not greater than 0.002g/t and not greater than 0.002g/t respectively. The method has the advantages of simplicity, stable operation process, short production period and small device investment, the prepared lithium carbonate is highly pure, contains a small amount of magnetic substances, has a comprehensive recovery rate of lithium of 98.65%, has a low production cost, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium carbonate preparation, and in particular relates to a method for preparing low-magnetic high-purity lithium carbonate with a simple process using salt lake lithium salt. Background technique [0002] With the rapid development of the lithium battery industry, the demand for lithium carbonate as the cathode material of lithium batteries has also increased significantly. The production methods of lithium carbonate are divided into two categories due to the different resources used: ore method and salt lake brine method. Lithium extraction by ore method is mainly concentrated in my country, including lime milk pressure cooking method, sulfate method and limestone roasting method. At present, the salt lake brine method is the mainstream production method in the world, mainly divided into precipitation method, solvent extraction method, carbonization method, calcination and leaching method, etc. Batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
Inventor 杨志强黄飞中王红忠常全忠曹笃盟郭燕平马骞宋如梦谭晓红
Owner JINCHUAN GROUP LIMITED
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