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Method for producing cobalt carbonate

A production method and technology of cobalt carbonate, applied in the direction of cobalt carbonate, etc., can solve the problems of difficult washing, difficult filtration, and high cobalt content, and achieve the effects of ensuring bulk density, solving diffusion problems, and good processing performance.

Active Publication Date: 2010-09-15
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still some problems in the production of carbonated cobalt at home and abroad, such as insufficient resource utilization, low yield (about 98%), difficult to filter, difficult to wash, high cobalt content in waste liquid (above 200ppm), and discharge exceeding the national Emission standard 200 times, etc.

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  • Method for producing cobalt carbonate

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Embodiment 1

[0017] to 2m 3 Add 950L of NH with a concentration of 250±10g / L to the reactor 4 HCO 3 , heated to 50°C, 575L of CoCl with a cobalt concentration of 130±5g / L at a stirring speed of 110 rpm 2 The solution was fast and then slow within 4h (starting rate of addition was 190 ± 10L / h, and along with the dropping of cobalt chloride solution, the color was dark red gradually; when the color of the solution appeared pink, the rate of addition changed to slow addition, Control the dropping rate to be 90 ± 10L / h, and add NH at a speed of 2h for fast and slow addition. 4 HCO 3 In the process, after the synthesis is completed, continue to stir for 1 hour and then carry out solid-liquid separation, wash the filter cake with pure water at 70°C until the pH of the solution is 7, and then dry it after dehydration to obtain the product. The chlorine content in the product is less than 0.02%, the yield is 99.5%, the cobalt content in the mother liquor is 0.03g / L, the primary particle D of t...

Embodiment 2

[0019] to 8m 3 Add 3800L of NH with a concentration of 250±10g / L into the reactor 4 HCO 3 , heated to 55 ° C, under the condition of a stirring speed of 130 rpm, 2300L of CoCl with a cobalt concentration of 130+5g / L 2 The speed of the solution is first fast and then slow within 8 hours (beginning to be a rapid drop section, the drop rate is 430 ± 10L / h, along with the dropwise addition of the cobalt chloride solution, the color is gradually dark red; after 3 hours, the solution color When the pink color appears, change the dropping speed to slow adding, control the dropping speed to be 130±10L / h) add NH 4 HCO 3 In the process, after the synthesis was completed, the solid-liquid separation was carried out after continuing to stir for 1 hour, and the filter cake was washed with pure water at 70° C. until the pH of the solution was 7, and then dried after dehydration to obtain the product. The chlorine content in the product is less than 0.02%, the yield is 99.5%, the cobalt ...

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Abstract

The invention relates to a method for producing cobalt carbonate, which can improve the yield of a product and reduce the cobalt content of waste liquid. The method for producing the cobalt carbonate comprises the following steps of: dripping CoCl2 aqueous solution with cobalt concentration of 130 + / - 5g / L into 250 + / - 10g / L NH4HCO3 aqueous solution at the temperature of between 40 and 60 DEG C and at the stirring speed of 100 to 130 revolutions per minute, wherein the volume ratio of the NH4HCO3 aqueous solution to the CoCl2 aqueous solution is 1.6 to 1.7, the dripping process is divided into a quick dripping section and a slow dripping section, the time ratio of the quick dripping section to the slow dripping section is 1:2-2:1, the color gradually becomes deep red along with the dripping of the CoCl2 solution at the quick dripping section, the quick dripping section is finished when the solution becomes pink and then the dripping speed is changed into slow dripping; and continuously stirring the solution for 1 hour after the dripping is finished, then performing solid-liquid separation, washing the solid by using pure water of 70 DEG C till the pH of the filtrate is 7, dehydrating the solid, and drying the solid to obtain the cobalt carbonate.

Description

technical field [0001] The invention relates to a production method of cobalt carbonate. Background technique [0002] Micron-sized particles with uniform particle size have many excellent properties due to their small particle size and large specific surface area, and are widely used in the fields of electronics, metallurgy, and chemical industry. Cobalt carbonate is the raw material for the production of battery-grade cobalt tetroxide, and its market demand for cobalt carbonate, which is the precursor of lithium cobalt oxide, the raw material for lithium batteries, is increasing. At present, there are still some problems in the production of carbonated cobalt at home and abroad, such as insufficient resource utilization, low yield (about 98%), difficult to filter, difficult to wash, high cobalt content in waste liquid (above 200ppm), and discharge exceeding the national Emission standard 200 times etc. Therefore, it is an urgent problem to be solved in the preparation pr...

Claims

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Application Information

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IPC IPC(8): C01G51/06
Inventor 袁国和王武李敏唐洲
Owner GEM JIANGSU COBALT IND CO LTD
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