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Method for continuously preparing large-particle-size spherical cobalt carbonate

A technology of cobalt carbonate and large particle size, applied in the direction of cobalt carbonate, etc., can solve the problems of poor fluidity, small particle size, complicated operation, etc., and achieve the effect of good fluidity and uniform particles

Active Publication Date: 2015-07-01
ZHEJIANG HUAYOU COBALT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production methods of cobalt carbonate in my country are all batch processes, which are characterized by agglomeration of particle shape, poor dispersion, poor fluidity, small particle size, limited volume in the kettle, and repeated operations are required to grow the particle size. Very complex and low yield

Method used

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  • Method for continuously preparing large-particle-size spherical cobalt carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare 3.5mol / L cobalt chloride solution, add 5g polyvinylpyrrolidone (PVP) and 60g / L ammonium bicarbonate solution to each liter of cobalt solution. Using pure water as the bottom liquid, add an excess of 27% mixed solution of ammonium bicarbonate, cobalt chloride and polyvinylpyrrolidone (PVP) into the reaction kettle in parallel. The process controls the pH value to 7.4, the temperature is 65°C, and the stirring speed is 900rpm. When it reaches the overflow port, it starts to feed continuously and output continuously. The reaction material is filtered by a centrifuge, washed, and dried to obtain a D50:26.65mm spherical cobalt carbonate product.

Embodiment 2

[0023] Prepare 0.8mol / L cobalt sulfate solution, add 0.8g cetyltrimethylammonium bromide (CTAB) and 170g / L ammonium carbonate solution to each liter of cobalt solution. Using pure water as the bottom liquid, add an excess of 15% mixed solution of ammonium bicarbonate, cobalt sulfate and cetyltrimethylammonium bromide (CTAB) into the reactor, the temperature is controlled at 30°C, and the pH value is controlled during the process 6.7, stirring speed 350rpm. When it reaches the overflow port, it starts to feed continuously and output continuously. The reaction material is filtered by a centrifuge, washed, and dried to obtain a D50:20.03mm spherical cobalt carbonate product.

Embodiment 3

[0025] Prepare 2.0mol / L cobalt sulfate solution, add 10g polyethylene glycol (PEG) and 240g / L ammonium bicarbonate solution to each liter of cobalt solution. Using pure water as the bottom liquid, add an excess of 20% ammonium bicarbonate, cobalt sulfate and polyethylene glycol (PEG) mixed solution into the reaction kettle in parallel, the temperature is controlled at 70°C, the process control pH value is 7.0, and the stirring speed is 650rpm. When it reaches the overflow port, it starts to feed continuously and output continuously. The reaction material is filtered by a centrifuge, washed, and dried to obtain a D50:17.45mm spherical cobalt carbonate product.

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Abstract

The invention discloses a method for continuously preparing large-particle-size spherical cobalt carbonate. All the cobalt carbonate production methods in China at present adopt an intermitted technique which has the characteristics of aggregated particle, poor dispersity and poor flowability. The method comprises the following steps: by using pure water as bottom liquor, adding a parallel flow of an excessive 10-30% precipitant solution and a soluble cobalt salt-activator mixed solution into a reaction kettle while controlling the pH value at 6.5-7.5, the temperature at 30-90 DEG C and the stirring speed at 200-100 rpm; starting continuous feeding and continuous output when achieving the overflow port; and filtering the reaction product, washing and drying to obtain the large-particle-size spherical cobalt carbonate. The particle size of the cobalt carbonate product forms standard normal distribution; the cobalt carbonate product has the advantages of uniform particle and favorable flowability; and D50 is 15-30mm.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a battery-grade Co 3 o 4 The invention discloses a continuous preparation method of precursor large particle size spherical cobalt carbonate. Background technique [0002] Cobalt carbonate is widely used in the production of cobalt salts, beneficiation agents, catalysts, camouflage coatings, chemical temperature indicators, feed, trace element fertilizers, ceramics, etc., especially in the battery industry as battery-grade Co 3 o 4 Precursor. With the society's continuous attention to green energy, the battery material industry has developed rapidly. At present, the lithium cobalt oxide process is the most mature. The reactivity of the lithium preparation process improves the discharge platform. [0003] At present, the production methods of cobalt carbonate in my country are all batch processes, which are characterized by agglomeration ...

Claims

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Application Information

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IPC IPC(8): C01G51/06
Inventor 王宁
Owner ZHEJIANG HUAYOU COBALT
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