Method for preparing small-particle size large-bulk cobalt carbonate

A technology of cobalt carbonate and small particle size, applied in cobalt carbonate and other directions, can solve the problems of poor controllability and large size range of cobalt carbonate

Inactive Publication Date: 2017-05-17
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent literature, application publication number is CN105600839A patent application, titled "a preparation method of battery-grade cobalt carbonate", cobalt carbonate is prepared by repeated positive addition, and the particle size range of cobalt carbonate is 10-12 μm. Vibration Solid density is 1.9~2.g / cm 3 , the particle size range of cobalt carbonate in this method has a large span and poor controllability

Method used

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  • Method for preparing small-particle size large-bulk cobalt carbonate
  • Method for preparing small-particle size large-bulk cobalt carbonate
  • Method for preparing small-particle size large-bulk cobalt carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The raw material solutions were prepared as follows: a cobalt chloride solution with a concentration of 120 g / L, an ammonium bicarbonate solution with a concentration of 220 g / L, and an ammonium bicarbonate solution with a concentration of 60 g / L.

[0028] Among them, the role of the ammonium bicarbonate base solution is to keep the precipitant excessive. When the cobalt chloride is dripped, the supersaturation is very large, and it immediately nucleates into small particles of cobalt carbonate, so that the number of nucleation is large and small, which helps In the later stage, the cobalt carbonate grains increase the degree of compaction.

[0029] Add 1000L of ammonium bicarbonate solution with a concentration of 60g / L as the bottom liquid into the reaction kettle, raise the temperature to 40℃, and add cobalt chloride solution and ammonium bicarbonate solution into the bottom liquid in parallel, where the flow rate of the cobalt chloride solution It is 600L / h, the flow rat...

Embodiment 2～5

[0034] On the basis of Example 1, some parameters in the preparation method of cobalt carbonate were subjected to comparative experiments. In Examples 2 to 5, the same reaction solution concentration parameters as in Example 1 were used, namely: the concentration of 120g / l Cobalt chloride solution, ammonium bicarbonate solution with a concentration of 220g / L, ammonium bicarbonate solution with a concentration of 60g / L, and ammonium bicarbonate solution with a concentration of 60g / L as the bottom liquid.

[0035] The following Tables 1 and 2 are the reaction process parameters of Examples 2-5.

[0036] Table 1 shows the process parameters of seed crystal generation in Examples 2-5

[0037] Serial number Base fluid volume Cobalt chloride flow Ammonium bicarbonate flow Seed growth time PH value at the end of the reaction 21000L 600L / h 900L / h1.5h7.1 31300L 600L / h 900L / h1.5h7.15 41900L 600L / h 900L / h1.5h7.15 51900L 600L / h 900L / h1.5h7.25

[0038] Table 2 shows the parameters of the seed...

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Abstract

The invention discloses a method for preparing small-particle size large-bulk cobalt carbonate. The method comprises the following steps: heating an ammonium carbonate base solution of certain concentration; respectively adding soluble cobalt salt and ammonium carbonate into the ammonium carbonate base solution according to certain velocities while stirring to react so as to obtain crystal slurry of cobalt carbonate after a certain time of the reaction; and by taking the crystal slurry of cobalt carbonate as a base solution, adding cobalt salt and ammonium carbonate to react for a certain time, thereby obtaining the target cobalt carbonate. The cobalt carbonate prepared by using the method has the characteristics of being small in particle size and large in bulk density.

Description

Technical field [0001] The invention relates to the technical field of material preparation, in particular to a preparation method of small particle size and large loose cobalt carbonate. Background technique [0002] Cobalt carbonate is generally used as a precursor of lithium cobalt oxide battery materials or automobile exhaust catalysts. The particle size of cobalt carbonate largely determines the performance of lithium cobalt oxide battery materials or automobile exhaust catalysts. [0003] At present, there are many processes for producing cobalt carbonate with a particle size of D50=10-12μm. The specific method is the method of co-currently adding cobalt liquid and ammonium bicarbonate aqueous solution to the reactor (and adding method), and the method of adding cobalt liquid to the ammonium bicarbonate aqueous solution. (Positive addition), the method of adding cobalt liquid to the ammonium bicarbonate aqueous solution (reverse addition), and repeating and adding. [0004] Ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/06
CPCC01G51/06C01P2004/03C01P2004/51C01P2004/61C01P2006/10C01P2006/11
Inventor 许开华郭苗苗吴伟陈元骁齐妍洁张云河张翔
Owner JINGMEN GEM NEW MATERIAL
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