Method and system for preparing cobalt carbonate

A technology of cobalt carbonate and cobalt carbonate crystal, applied in the direction of cobalt carbonate, can solve the problems of low tap density and high energy consumption of cobalt carbonate, and achieve the effects of high sphericity, increased solid content and increased efficiency

Active Publication Date: 2018-06-22
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the existing system for preparing cobalt carbonate reacts to generate cobalt carbonate at high temperature, so that ...

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  • Method and system for preparing cobalt carbonate

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Embodiment 1

[0040] Bottom liquid preparation stage: to 8m 3 The ammonium bicarbonate solution with a flow rate of 1000 L / h and a concentration of 215 g / L was added to the seed crystal tank through a metering pump for 3 minutes. Then, add water to the second layer of stirring paddle of the seed crystal kettle in the seed crystal kettle, and open the steam valve. When the temperature in the seed crystal tank increased to 50° C., the stirring speed of the motor was adjusted to 1300 r / min.

[0041] Primary feeding stage: start cobalt salt solution metering pump and ammonium bicarbonate solution metering pump, the concentration of the cobalt salt solution that adds in seed crystal still is 130g / L, flow rate is 460L / h; The concentration of the ammonium bicarbonate solution that adds is 215g / L, the flow rate is 1000L / h. Within 12 hours of the reaction, the flow rate of the cobalt salt solution remained unchanged; and within 1 hour of the initial reaction, the pH value in the seed crystal tank ...

Embodiment 2

[0047] The difference between this embodiment and embodiment 1 is that in the bottom liquid preparation stage, the 8m 3 The ammonium bicarbonate solution with a flow rate of 1000 L / h and a concentration of 210 g / L was added to the seed crystal tank through a metering pump for 5 minutes. Then, add water to the second layer of stirring paddle of the seed crystal kettle in the seed crystal kettle, and open the steam valve. When the temperature in the seed crystal tank increased to 48° C., the stirring speed of the motor was adjusted to 1100 r / min.

[0048] By the method of embodiment 2, the particle diameter D50 of the cobalt carbonate finished product that obtains is 17.8 μ m, tap density is 2.8g / cm 3 , and less small particles.

Embodiment 3

[0050] The difference between this embodiment and Example 1 is that in the primary feeding stage, the concentration of the cobalt salt solution added to the seed crystal tank is 140g / L, and the flow rate is 460L / h; the concentration of the added ammonium bicarbonate solution is 225g / L, the flow rate is 1000L / h. Within 12 hours of the reaction, the flow rate of the cobalt salt solution remained unchanged; and within 1 hour of the initial reaction, the pH value in the seed crystal tank slowly decreased to 7.4. After 12 hours of reaction, the pH value in the seed tank was maintained at 7.0-7.4, and the stirring speed of the motor was adjusted to 900 r / min.

[0051] By the method of embodiment 3, the particle diameter D50 of the cobalt carbonate finished product that obtains is 16.8 μ m, tap density is 2.6g / cm 3 , and less small particles.

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Abstract

The invention provides a method for preparing cobalt carbonate. The method comprises the following steps: S1, adding a cobalt salt solution and an ammonium hydrogencarbonate solution into a seed crystal kettle, reacting for 20-30 hours, and then increasing the flow rate of the cobalt salt solution by 20-40L/h every 15-20h until cobalt carbonate seed crystals with the particle diameter D50 of 11.5-14.0 microns are obtained; S2, adding the cobalt carbonate seed crystals into a finished product kettle, and adding the cobalt salt solution and the ammonium hydrogencarbonate solution into the finished product kettle; S3, reacting for 15-20 hours, and then increasing the flow rate of the cobalt salt solution in the S2 by 40-60L/h until a finished cobalt carbonate product with the tap density of 2.5-2.8g/cm<3> is obtained. Through control of the flow rate of the cobalt salt solution in different time periods, the process of preparing the cobalt carbonate is performed smoothly, so that more cobalt carbonate seed crystals conforming to morphological features and the finished cobalt carbonate product are obtained; in addition, the cobalt carbonate seed crystals are used for preparing the cobalt carbonate finished product, so that the yield and the preparation efficiency of the cobalt carbonate finished product are improved.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium-ion batteries, and more specifically, to a method and system for preparing cobalt carbonate. Background technique [0002] Lithium cobalt oxide batteries have the advantages of stable structure, high specific capacity, and outstanding comprehensive performance, and are currently one of the most mature cathode materials in lithium-ion batteries. [0003] However, due to the safety problems of lithium cobalt oxide itself, its application in power batteries and high-power batteries is limited. It has been found through research that increasing the primary crystal grains of lithium cobalt oxide can not only improve the safety performance of lithium cobalt oxide cathode material, but also increase the volumetric energy density of the battery without reducing the comprehensive electrical properties of lithium cobalt oxide. The research and development of single crystal lithium cob...

Claims

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Application Information

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IPC IPC(8): C01G51/06
CPCC01G51/06C01P2004/61C01P2006/11
Inventor 许开华刘文泽洪宏龙易全瑞
Owner JINGMEN GEM NEW MATERIAL
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