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Preparation method of high-gravity spherical cobalt carbonate

A technology of cobalt carbonate and high specific gravity, applied in the direction of cobalt carbonate, etc., can solve problems such as unfavorable production efficiency, excessive particle growth, unfavorable product stability, etc., and achieve the effects of uniform and controllable particle size, short reaction time and large specific gravity.

Inactive Publication Date: 2011-02-16
安徽寒锐新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional cobalt carbonate production method is to use cobalt chloride and ammonium bicarbonate to react under high temperature conditions, which can easily cause severe local reactions, excessive particle growth, and various shapes, which is not conducive to the stability of the product
The basic cobalt carbonate prepared in the patent (96195592.9) disclosed by German Stark Company in 1998 has a high degree of sphericity, but cobalt carbonate is a spherical particle formed by the aggregation of fine particles, not a dense spherical carbonate Cobalt; in the preparation method of spherical cobalt carbonate mentioned in the domestic patent (200810143011.X), although the physical appearance and physical index of the cobalt carbonate prepared are acceptable, in the preparation process, the reaction temperature is low, and involves 18 hours of aging growth time, which is not conducive to the improvement of production efficiency

Method used

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  • Preparation method of high-gravity spherical cobalt carbonate
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  • Preparation method of high-gravity spherical cobalt carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1). Prepare cobalt sulfate aqueous solution and ammonium bicarbonate aqueous solution, wherein the cobalt concentration of cobalt sulfate aqueous solution is 30g / L, and the ammonium bicarbonate aqueous solution concentration is 200g / L. The prepared solutions were transferred to the elevated tank respectively, and the cobalt sulfate aqueous solution was preheated and kept at 40°C.

[0024] 2). Precipitation: Add 500ml of deionized water into the 10L reactor, raise the temperature to 60±5°C, and add the cobalt sulfate aqueous solution into the reactor at a slow speed and then quickly at a stirring speed of 800 rpm. Ammonium bicarbonate aqueous solution was added dropwise, the pH value of the reaction solution was controlled between 7.0 and 7.5, and the total volume of the reaction solution was increased to 7.5 L within 3 hours. Concrete feed process is: first feed at a slow speed until the total volume of the reaction solution reaches 2.5L, and the feed rate of the cobalt...

Embodiment 2

[0028] 1). Prepare cobalt sulfate aqueous solution and ammonium bicarbonate aqueous solution, wherein cobalt sulfate aqueous solution cobalt concentration is 50g / L, and ammonium bicarbonate aqueous solution concentration is 200g / L. The prepared solutions were transferred to the elevated tank respectively, and the cobalt sulfate aqueous solution was preheated and kept at 50°C.

[0029] 2). Precipitation: Add 500ml of deionized water into the 10L reactor, raise the temperature to 70±5°C, and under the condition of stirring speed of 1000 rpm, add the cobalt sulfate aqueous solution into the reactor slowly and then quickly, and at the same time Ammonium bicarbonate aqueous solution was added dropwise, the pH value of the reaction solution was controlled between 7.0 and 7.5, and the total volume of the reaction solution was increased to 7.5 L within 2 hours. Concrete feed process is: first feed at a slow speed until the total volume of the reaction solution reaches 3.5L, and the fe...

Embodiment 3

[0033] 1). Prepare cobalt sulfate aqueous solution and ammonium bicarbonate aqueous solution, wherein cobalt sulfate aqueous solution cobalt concentration is 50g / L, and ammonium bicarbonate aqueous solution concentration is 200g / L. The prepared solutions were transferred to the elevated tank respectively, and the cobalt sulfate aqueous solution was preheated and kept at 50°C.

[0034] 2). Precipitation: Add 500ml of deionized water into the 10L reactor, raise the temperature to 80±5°C, and under the condition of stirring speed of 1200 rpm, add the cobalt sulfate aqueous solution into the reactor slowly and then quickly, and at the same time Ammonium bicarbonate aqueous solution was added dropwise, the pH value of the reaction solution was controlled between 7.0 and 7.5, and the total volume of the reaction solution was increased to 7.5 L within 1 hour. Concrete feed process is: first feed at a slow speed until the total volume of the reaction solution reaches 4.5L, and the fee...

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Abstract

The invention relates to a preparation method of high-gravity spherical cobalt carbonate, comprising the following steps of: with a water-soluble cobalt salt as a raw material and ammonium hydrogen carbonate as a precipitant adding a cobalt salt aqueous solution and an ammonium hydrogen carbonate aqueous solution into a reactor at the same time by adopting a first-slow and rear-quick stage feeding manner at reaction temperature of 60-90DEG C under a stirring condition, wherein a feeding speed ratio of the cobalt salt aqueous solution of a slow feeding stage to a quick feeding stage is 1:2.5-1:10, and the feeding volume of the slow feeding stage occupies 25-60 percent of the total feeding volume; controlling pH of a reaction solution between 7.0 and 7.5; then, reducing the temperature to carry out heat preservation reaction; and filtering, drying and washing a reaction product to obtain the high-gravity spherical cobalt carbonate. Under the condition of high temperature, a first-slow and rear-quick stage speed-control feeding manner is adopted to prepare cobalt carbonate which has the advantages of high spherical degree, high gravity, controllable grain diameter, good dispersive property and good flow property and can satisfy different product requirements; meanwhile, the invention has short reaction time and is beneficial to the increasing of the production efficiency.

Description

technical field [0001] The invention relates to a preparation method of high specific gravity spherical cobalt carbonate. Background technique [0002] Cobalt carbonate is widely used in the preparation of various cobalt products, such as: tricobalt tetroxide, cobalt oxide, lithium cobaltate and cobalt powder. The powder properties of these cobalt products, such as particle size, particle size distribution and morphology, have a great inheritance from the powder properties of their precursor cobalt carbonate. Especially with the rapid development of various micro-electrical technology and national defense industry in China, the demand for high-capacity batteries and high-performance materials is increasing, and the demand for lithium cobalt oxide, the main positive electrode material of lithium-ion secondary batteries, is also increasing. , and cobalt carbonate is an important raw material for the production of lithium cobalt oxide, and its density and powder morphology hav...

Claims

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Application Information

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IPC IPC(8): C01G51/06
Inventor 顾正海王芬
Owner 安徽寒锐新材料有限公司
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