Preparation method of high-purity lithium carbonate

A lithium carbonate and high-purity technology, applied in the direction of lithium carbonate; conversion effect

Inactive Publication Date: 2020-06-26
苏州波粒新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art, the present invention provides a method for preparing high-purity lithium carbonate, which solves the problems of complex existing processes and low efficiency caused by impurity removal processes, and utilizes the spray reaction system to form rapid vaporization of raw materials and products to form Lithium carbonate crystal nucleus structure greatly improves the complete conversion of lithium carbonate

Method used

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Examples

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Effect test

preparation example Construction

[0015] A kind of preparation method of high-purity lithium carbonate, comprises the steps:

[0016] Step 1, slowly add lithium chloride to distilled water for low-temperature ultrasonication, and obtain a lithium chloride solution after filtration; the concentration of lithium chloride in distilled water is 30-60g / L, and the speed of slow addition is 2-5g / min. The ultrasonic temperature is 10-20°C, and the ultrasonic frequency is 40-80kHz; slowly adding lithium chloride to distilled water can take advantage of the good dissolution characteristics of lithium chloride itself to form a stable lithium chloride solution, and the low-temperature ultrasonic method It can accelerate the rapid dispersion and dissolution of lithium chloride and form a stable and uniform solution;

[0017] Step 2, add ammonium bicarbonate to distilled water and stir at low temperature until completely dissolved to form ammonium bicarbonate solution; the concentration of ammonium bicarbonate in distilled ...

Embodiment 1

[0021] A kind of preparation method of high-purity lithium carbonate, comprises the steps:

[0022] Step 1, slowly add 30g of lithium chloride to 1L of distilled water for low-temperature ultrasonication, and filter to obtain a lithium chloride solution; the speed of slow addition is 2-5g / min, the temperature of low-temperature ultrasonication is 10°C, and the ultrasonic frequency is 40kHz;

[0023] Step 2, add 70g of ammonium bicarbonate to 1L of distilled water and stir until completely dissolved to form a solution of ammonium bicarbonate; the temperature of low-temperature stirring is 15°C, and the stirring speed is 1000r / min;

[0024] Step 3, the lithium chloride solution is slowly added dropwise to the ammonium bicarbonate solution, and stirred evenly at a low temperature until the dropwise addition is completed, and left to stand at a low temperature for 1 hour to obtain a mixed solution; the volume of the lithium chloride solution is the volume of the ammonium bicarbonat...

Embodiment 2

[0028] A kind of preparation method of high-purity lithium carbonate, comprises the steps:

[0029] Step 1, slowly add 60g of lithium chloride to 1L of distilled water for low-temperature ultrasonication, and filter to obtain a lithium chloride solution; the speed of slow addition is 5g / min, the temperature of low-temperature ultrasonication is 20°C, and the ultrasonic frequency is 80kHz;

[0030] Step 2, add 140g of ammonium bicarbonate to 1L of distilled water and stir until completely dissolved to form a solution of ammonium bicarbonate; the temperature of low-temperature stirring is 20°C, and the stirring speed is 2000r / min;

[0031] Step 3, the lithium chloride solution is slowly added dropwise to the ammonium bicarbonate solution, and stirred evenly at a low temperature until the dropwise addition is completed, and left standing at a low temperature for 3 hours to obtain a mixed solution; the volume of the lithium chloride solution is the ammonium bicarbonate solution 83...

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Abstract

The invention belongs to the field of chemical engineering, relates to the field of lithium batteries, and particularly relates to a preparation method of high-purity lithium carbonate. The preparation method comprises the following steps: 1, slowly adding lithium chloride into distilled water, carrying out low-temperature ultrasonic treatment, and filtering to obtain a lithium chloride solution;2, adding ammonium bicarbonate into distilled water, and stirring at a low temperature until ammonium bicarbonate is completely dissolved to form an ammonium bicarbonate dissolving solution; 3, slowlydropwise adding the lithium chloride solution into the ammonium bicarbonate solution, uniformly stirring at a low temperature until drop-by-drop addition is finished, and standing for 1-3 h at a lowtemperature so as to obtain a mixed solution; and 4, adding the mixed solution into a reaction kettle, carrying out a constant-temperature spray reaction, carrying out standing sedimentation, carryingout tail blowing by using dry nitrogen, and cooling to obtain the high-purity lithium carbonate. The problems of complex process and low efficiency caused by an impurity removal process in the priorart are solved, a spray reaction system is utilized to form rapid vaporization of raw materials and products, a lithium carbonate crystal nucleus structure is formed, and complete conversion of lithium carbonate is greatly improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, relates to the field of lithium batteries, in particular to a preparation method of high-purity lithium carbonate. Background technique [0002] Lithium-ion batteries have high capacity, high voltage, low energy consumption, no memory effect, no pollution, and small size. It is widely used in electronic products such as mobile phones, PDAs, notebook computers, portable CDs, etc., and is gradually expanding to the fields of electric vehicles, space technology, and national defense industry. It is the most concerned product nowadays. One of the new batteries. Nanoscale electrode materials for lithium-ion batteries have the characteristics of small grain size, large specific surface area, and high ion diffusion coefficient, which is conducive to the insertion and extraction of lithium ions in the active material in the inner layer of the particle, improving the utilization rate of the active materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08C01P2004/61C01P2006/80
Inventor 桂安标
Owner 苏州波粒新能源科技有限公司
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