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Method for preparing small-particle-size cobalt carbonate

A technology of small particle size, cobalt carbonate, applied in the direction of cobalt carbonate, etc., can solve the problems of difficult reaction temperature and pH value of reaction solution, uneven particle size distribution of cobalt carbonate, particle size of particle agglomeration, etc., to achieve low cost, particle size and other problems. Controllable, small particle size effect

Inactive Publication Date: 2011-07-06
JIANGSU FANGZHOU NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The old-fashioned cobalt carbonate production process is mostly a batch reaction, because it is difficult to control the reaction temperature and the pH value of the reaction solution, resulting in unstable product quality; at the same time, the production process is prone to excessive alkali, resulting in basic cobalt carbonate, resulting in uneven particle size distribution of cobalt carbonate , the problems of particle agglomeration and excessive particle size appear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Use deionized water to make cobalt chloride into 0.1M, ammonium citrate into 0.05M solution A, use deionized water to make sodium carbonate into 0.1M, ammonia water into 0.05M solution B, and turn on the reaction vessel for stirring , put 1 / 10 volume of deionized water into the container as the bottom water, heat the bottom water to 30°C, add solution A into the reaction vessel at a flow rate of 5ml / min, and add solution B into the reaction vessel at a flow rate of 5ml / min , control the pH value to 6, react for 10 hours, the precipitate generated by the reaction overflows to the washing and filtering equipment, wash the precipitate until the impurity content is qualified, the pH of the washing water is 6.5, filter, and the filter cake is baked at 80°C for 10 hours. 80-mesh sieve to obtain small-sized cobalt carbonate powder with a purity of ≧99%.

Embodiment 2

[0023] Use deionized water to make cobalt chloride into 2.5M, ammonium oxalate into 1.75M solution A, use deionized water to make ammonium bicarbonate into 2.5M, ammonia water into 1.75M solution B, and turn on the reaction vessel to stir , put 1 / 5 volume of deionized water into the container as the bottom water, heat the bottom water to 50°C, add solution A into the reaction vessel at a flow rate of 5ml / min, and add solution B into the reaction vessel at a flow rate of 10ml / min , control the pH value to 7, react for 8 hours, the precipitate generated by the reaction overflows to the washing and filtering equipment, wash the precipitate until the impurity content is qualified, the pH of the washing water is 7, filter, and the filter cake is baked at 100 ° C for 6 hours, after drying Pass through an 80-mesh sieve to obtain small-diameter cobalt carbonate powder with a purity of ≧99%.

Embodiment 3

[0025] Use deionized water to make cobalt nitrate into 5.0M, ammonium citrate into 2.5M A solution, use deionized water to make sodium bicarbonate into 5.0M, citric acid into 2.5M solution B, and open the reaction vessel. Stir, put 3 / 10 volume of deionized water into the container as the bottom water, heat the bottom water to 60°C, dissolve A and add it to the reaction container at a flow rate of 5ml / min, and add solution B to the reaction container at a flow rate of 15ml / min In the process, control the pH value to 8, react for 6 hours, the precipitate generated by the reaction overflows to the washing and filtering equipment, wash the precipitate until the impurity content is qualified, the pH of the washing water is 7.5, filter, the filter cake is baked at 120 ° C for 2 hours, and dried After passing through an 80-mesh sieve, a small-sized cobalt carbonate powder with a purity of ≧99% is obtained.

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Abstract

The invention discloses a method for preparing small-particle-size cobalt carbonate, which comprises the following steps: preparing solution A with a cobalt slat concentration of 0.1 to 10M and an additive concentration of 0.05 to 5M by dissolving an industrial cobalt salt and an additive in deionized water; preparing solution B with a precipitator concentration of 0.1 to 10M and a complexing agent concentration of 0.05 to 5M by dissolving an industrial precipitator and a complexing agent in deionized water; filling deionized water which accounts for 1 / 10 to 3 / 10 of the volume of the reactor into the reactor, filling the solution A and the solution B into the reactor according to a volume ratio of 1:1 to 1:5 to perform a precipitation reaction, controlling the pH value to be 6 to 10, and reacting for 4 to 10 hours; and overflowing the precipitator formed by the reaction into a washing and filtering device, washing the precipitator till the pH value of the washing water is between 6.5 and 7.5, filtering, and drying the filter cake in an oven at 80 to 120 DEG C for 2 to 10 hours to obtain small-particle-size cobalt carbonate powder. In the invention, the small-particle-size cobalt carbonate powder prepared by a controlled synthesis process has high flowability, small particle size, uniform particle size distribution, and large specific surface area and makes the realization of industrial production easy.

Description

technical field [0001] The invention relates to a method for preparing cobalt carbonate with a small particle size, which is mainly used for preparing cobalt powder, cobalt oxide, cobaltous oxide, lithium cobaltate, a positive electrode material for lithium ion batteries, and derivative products thereof. Background technique [0002] Cobalt carbonate powder is widely used in the production of cobalt salts, beneficiation agents, nickel-metal hydride battery additives, camouflage coatings and chemical temperature indicators, trace element fertilizers, feed and ceramics, especially in the battery industry as a highly active cobalt carbonate Essential materials require high purity, fine particle size, and narrow particle size distribution. In recent years, my country has been a big consumer of cobalt. Due to the rapid development of the battery industry at home and abroad, the amount of cobalt has risen sharply. Since 2002, the demand for cobalt powder in my country's battery i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/06
Inventor 左小虎昌旭初伍儒锋喻国强
Owner JIANGSU FANGZHOU NEW ENERGY
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