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Process for preparing superfine cobalt oxide powder by booster parallel-flow precipitation

A technology of cobalt oxide and powder, which is applied in the field of preparation of ultra-fine uniformly dispersed cobalt oxide, can solve the problems of insufficient consideration of the mixing state of the feeding method, uneven powder particle size, large quality fluctuation, etc., and achieves convenient control, fine product particle size, The effect of simple process operation

Inactive Publication Date: 2005-11-09
CENT SOUTH UNIV +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Among the current methods of preparing cobalt oxide by precipitation, the selection of the precipitation system and the control of the process conditions are considered more, but the feeding method and the mixing state of the solution are not considered enough in the precipitation process. The general feeding method is easy to cause reaction feed liquid Partially too concentrated, resulting in uneven powder particle size
The produced powder has coarse particle size, wide distribution, and large quality fluctuations

Method used

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  • Process for preparing superfine cobalt oxide powder by booster parallel-flow precipitation

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Effect test

Embodiment 1

[0021] The high-purity cobalt chloride solution obtained after P204 extraction and impurity removal and P507 separation of nickel and cobalt, the content of cobalt in the solution is about 75 g / L, the pH value of the solution is controlled between 4.5-5.0, and the weight ratio of the content of cobalt is added Surfactant OP of 0.5%: Weigh ammonium bicarbonate at a ratio of 3:1 to cobalt chloride, add water to fully mix and dissolve, and adjust the pH value of the solution to be 8.5-9.0; The two feed liquids prepared above are added to a 200-liter high-speed stirring reaction tank (500 rpm) under the effect of a booster pump in parallel with jet flow; realize fast and sufficient mixing in this small-sized stirring tank; Pressure feeding pressure and flow control are based on the final pH value of the mixed solution being about 6.8; after staying in the stirring tank for 3-5 minutes, flow into a large stirring tank with a size of 2 cubic meters (rotating speed is 100 rpm) and con...

Embodiment 2

[0023] The high-purity cobalt sulfate solution extracted and removed by P204, the cobalt content in the solution is about 90 g / L, the pH value of the solution is controlled between 4.5-5.0, and the surfactant Tween-80 is added in an amount equal to the cobalt content in the solution 0.8% of 0.8%; weigh sodium carbonate at a ratio of 1.5:1 to cobalt sulfate, add hot water at 60°C to fully dissolve it, and adjust the pH value of the solution to be 9.0-10.0; Under the action of the booster pump, the two feed liquids are fed into a 200-liter high-speed stirring tank (500 rpm) in parallel in the form of a jet; in this small stirring tank, rapid and sufficient mixing, reaction, and precipitation are realized; pressurization The feeding pressure and flow control are based on the pH value of the mixed solution at the end point of about 8.3; after staying in the stirred tank for 3-5 minutes, it flows into a large stirred tank with a size of 2 cubic meters (rotating speed is 100 rpm), an...

Embodiment 3

[0025] The electrolytic high-purity metal cobalt is added to industrial nitric acid with a concentration of 30% for dissolution in stages, the cobalt content is controlled at about 100 g / L, the pH value of the solution is controlled at about 4.5, and the surfactant Span is added in an amount equal to the cobalt content in the solution 1.0% of 1.0% of cobalt nitrate; weigh ammonium carbonate at a ratio of 3:1 to cobalt nitrate, fully dissolve it in deionized water, and adjust the pH value of the solution to be 9.0-10.0; Under the action of the booster pump, the feed liquid is fed into a 200-liter high-speed stirred reactor (500 rpm) in parallel in the form of a jet; in this small stirred reactor, rapid and sufficient mixing is achieved; boosting the feeding pressure to mix The final pH value of the solution is about 8.0 as the criterion; after staying in the stirring tank for 3-5 minutes, it flows into a large stirring tank with a size of 2 cubic meters (rotating speed is 100 re...

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Abstract

A process for preparing the superfine cobalt oxide powder includes such steps as high-speed pumping the Co salt solution and carbonate precipitant into a small-volume intermediate reactor with strong stirrer for mixing, stirring in a large-volume stirrer, ageing, drying and calcining at 300-900 deg.C for 4-15 hr.

Description

technical field [0001] The invention relates to a method for preparing ultrafine uniformly dispersed cobalt oxide applied in the fields of electronics, batteries, ceramics, etc., in particular to a method for preparing ultrafine uniformly dispersed cobalt oxide by a pressurized co-current precipitation method. Background technique [0002] Cobalt oxide is an important inorganic functional powder material, mainly used in ceramics, hard alloys, magnetic materials, catalysts, lithium-ion battery electrodes, thermistors, varistors, nonlinear voltage resistors, zinc oxide arresters, Picture tube glass bulb materials and other fields. Since the particle size, morphology and structure of the powder have an important impact on the performance of the powder, these physical indicators should be strictly controlled during the preparation of the powder. The current method of preparing ultra-fine cobalt oxide powder usually adopts the "chemical precipitation-thermal decomposition" proce...

Claims

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Application Information

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IPC IPC(8): C01G51/04
Inventor 郭学益黄凯刘荣义刘晓剑李平卿波韩剑慧
Owner CENT SOUTH UNIV
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