Preparation method of cobalt carbonate with wide particle size distribution

A cobalt carbonate and wide distribution technology, applied in the direction of cobalt carbonate, etc., can solve the problems of insufficient mixing and high requirements, and achieve the effect of uniform particle size distribution and high tap density

Pending Publication Date: 2021-12-07
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the continuous development of the electronic communication field in society, the demand for lithium secondary batteries continues to increase. Battery-grade lithium cobalt oxide is the most important raw material in the 3C digital field, especially the digital products in the high-end field are currently in short supply. Many cathode material companies will study The center shifts to the large particle size spherical cobalt tetroxide with high tap

Method used

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  • Preparation method of cobalt carbonate with wide particle size distribution
  • Preparation method of cobalt carbonate with wide particle size distribution
  • Preparation method of cobalt carbonate with wide particle size distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of cobalt carbonate with wide distribution particle size, comprising:

[0029] (1) preparation cobalt concentration is 120g / L cobalt chloride solution, preparation concentration is the ammonium bicarbonate solution of 280g / L; Add pure water, ammonium bicarbonate solution successively in the first seed crystal kettle and prepare bottom liquid and stir, stir The mechanism is a double-layer stirring blade with a rotating speed of 150r / min; among them, the pH of the bottom liquid is 8.5, the concentration of ammonium bicarbonate in the bottom liquid is 5g / L, and the ratio of the volume of pure water added to the volume of the first seed crystal tank is 0.7 ;The temperature of the bottom liquid is 30°C;

[0030] (2) Cobalt chloride solution and ammonium bicarbonate solution are respectively added to the first crystal seed kettle simultaneously by feed flow rate of 250L / h and 500L / h to carry out the synthesis reaction, and the slurry pH in the first seed ...

Embodiment 2

[0036] A preparation method of cobalt carbonate with wide distribution particle size, comprising:

[0037](1) preparation cobalt concentration is the cobalt chloride solution of 150g / L, preparation concentration is 200g / L ammonium bicarbonate solution; Add pure water, ammonium bicarbonate solution to prepare bottom liquid successively in the first seed crystal kettle and stir, stir The mechanism is a double-layer stirring blade with a rotating speed of 200r / min; wherein, the pH of the bottom liquid is 8.0, the concentration of ammonium bicarbonate in the bottom liquid is 3.5g / L, and the ratio of the volume of pure water added to the volume of the first seed crystal tank is 1.1; The temperature of the bottom liquid is 45°C;

[0038] (2) Cobalt chloride solution and ammonium bicarbonate solution are respectively added to the first crystal seed kettle to carry out synthetic reaction according to the feed flow rate of 350L / h and 700L / h, and the pH of the slurry in the first seed c...

Embodiment 3

[0044] A preparation method of cobalt carbonate with wide distribution particle size, comprising:

[0045] (1) preparation cobalt concentration is the cobalt chloride solution of 180g / L, preparation concentration is the ammonium bicarbonate solution of 240g / L; In the first crystal seed still, add pure water, ammonium bicarbonate solution and prepare bottom liquid successively and stir, The stirring mechanism is a double-layer stirring blade, and the rotating speed is 300r / min; wherein, the pH of the bottom liquid is 7.5, the concentration of ammonium bicarbonate in the bottom liquid is 2g / L, and the ratio of the volume of pure water added to the volume of the first seed crystal tank is 1.5; The temperature of the bottom liquid is 60°C;

[0046] (2) Cobalt chloride solution and ammonium bicarbonate solution are respectively added to the first seed crystal kettle simultaneously by feed flow rate of 500L / h and 1000L / h to carry out the synthesis reaction, and the pH of the slurry ...

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Abstract

The invention discloses a preparation method of cobalt carbonate with wide particle size distribution. The preparation method mainly comprises the following steps: preparing a cobalt chloride solution and an ammonium bicarbonate solution with different concentrations; synthesizing three different seed crystals through a crystallization kettle, and growing a finished product; and washing cobalt carbonate through a centrifugal machine, and directly drying wet cobalt carbonate dried through a rotary kiln. The prepared cobalt carbonate is uniform in particle size distribution, the particle size distribution coefficient reaches 0.6-0.7, sintering agglomeration is avoided, the tap density is high, and industrialization is easy.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a method for preparing cobalt carbonate with a wide particle size distribution. Background technique [0002] With the continuous development of the electronic communication field in society, the demand for lithium secondary batteries continues to increase. Battery-grade lithium cobalt oxide is the most important raw material in the 3C digital field, especially the digital products in the high-end field are currently in short supply. Many cathode material companies will study The center shifts to the large particle size spherical cobalt tetroxide with high tap density, but in order to further increase the tap density and unit capacity of the positive electrode material, a large number of cobalt tetroxide manufacturers have begun to produce mixed particles of large and small sizes to increase the tap density of the material. The method is late-stage mixing, and t...

Claims

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Application Information

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IPC IPC(8): C01G51/06
CPCC01G51/06C01P2004/03C01P2004/61
Inventor 许开华易全瑞刘玉成刘文泽洪宏龙
Owner JINGMEN GEM NEW MATERIAL
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