Preparation method of cobalt oxide powder

A technology of cobalt oxide and powder, applied in the field of preparation of cobalt oxide powder, can solve the problems of difficulty in particle size and performance, uneven particle size of cobalt oxide powder, easy agglomeration of cobalt oxide powder, etc., and achieves dispersibility. Good spheroidization effect, narrow particle size distribution range and high production efficiency

Inactive Publication Date: 2017-02-22
GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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Problems solved by technology

The particle size of the cobalt oxide powder prepared by the traditional process is not uniform, and the particle size is relatively large, ...

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  • Preparation method of cobalt oxide powder
  • Preparation method of cobalt oxide powder
  • Preparation method of cobalt oxide powder

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preparation example Construction

[0035] A preparation method of cobalt oxide powder, comprising the following steps:

[0036] A. Precipitation:

[0037] Using ammonium bicarbonate solution as precipitating agent, adding cobalt chloride solution by ultrasonic atomization and spraying method of back titration, and adding surfactant at the same time, reacting to obtain cobalt carbonate precipitation; wherein, the concentration of the cobalt chloride solution is 0.2 mol / L, the concentration of described ammonium bicarbonate solution is 0.4mol / L;

[0038] B. Filtration separation:

[0039] The cobalt carbonate precipitate is filtered through water to remove unreacted substances, and then dried at low temperature to remove water to obtain a cobalt oxide precursor;

[0040] C. Thermal decomposition:

[0041] Calcining the cobalt oxide precursor obtained in step B at 500-600°C to obtain Co 3 o 4 powder;

[0042] Alternatively, the cobalt oxide precursor obtained in step B is calcined at 1100-1200° C. to obtain ...

Embodiment 5

[0076] A. Precipitation: Ammonium bicarbonate (NH 4 HCO 3 ) as a precipitant, in the way of anti-titration precipitant dropwise, using ultrasonic atomization to spray CoCl 2 Solution, add surfactant T-80 simultaneously, reaction temperature 20 ℃, reaction time is 30min, and precipitant excess coefficient is 2 (C 2 o 4 2- / Co 2+ =2), the cobalt carbonate precipitation that makes;

[0077] B. Filtration and separation: the precipitate obtained in step A is washed and filtered to remove unreacted substances in the precipitate, and then dried at low temperature to remove most of the water to obtain a cobalt oxide precursor;

[0078] C. Thermal decomposition: Use a muffle furnace at 600°C for 4 hours to calcinate the precursor basic cobalt carbonate prepared in the first step to prepare Co 3 o 4 powder. In a tube furnace, the precursor cobalt basic carbonate prepared in the first step was calcined at 1200° C. for 4 hours under nitrogen gas as a protective atmosphere to prep...

Embodiment 6

[0080] A. Precipitation: Ammonium bicarbonate (NH 4 HCO 3 ) as a precipitant, in the way of anti-titration precipitant dropwise, using ultrasonic atomization to spray CoCl 2 Solution, add surfactant T-80 simultaneously, reaction temperature 20 ℃, reaction time is 30min, and precipitant excess coefficient is 2 (C 2 o 4 2- / Co 2+ =2), the cobalt carbonate precipitation that makes;

[0081] B. Filtration and separation: the precipitate obtained in step A is washed and filtered to remove unreacted substances in the precipitate, and then dried at low temperature to remove most of the water to obtain a cobalt oxide precursor;

[0082] C. Thermal decomposition: Use a muffle furnace at 500°C for 5 hours to calcinate the precursor basic cobalt carbonate prepared in the first step to prepare Co 3 o 4 powder. In a tube furnace, the precursor cobalt basic carbonate prepared in the first step was calcined at 1100° C. for 5 hours under nitrogen gas as a protective atmosphere to prep...

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Abstract

A preparation method of cobalt oxide powder includes the following steps that A, during precipitating, an ammonium hydrogen carbonate solution is adopted as precipitator, a cobalt chloride solution is added in an ultrasonic atomization spraying mode with back titration, meanwhile, a surface active agent is added, and cobalt carbonate precipitate is obtained through a reaction, wherein the concentration of the cobalt chloride solution is 0.2 mol/L, and the concentration of the ammonium bicarbonate solution is 0.4 mol/L; B, during filtering and separating, the cobalt carbonate precipitate is filtered with water, then substances without a reaction are removed, then low-temperature drying is carried out for dewatering, and a cobalt oxide precursor is obtained; C, the cobalt oxide powder is obtained through thermal decomposition. The preparation method of the cobalt oxide powder is simple in technology, the pH is kept to be ranged from 7 to 8 during the reaction, and the generated cobalt oxide powder is high in purity and production efficiency and narrow in particle size distribution interval and does not contain impurity ions.

Description

technical field [0001] The invention relates to the technical field of alloy powder preparation, in particular to a method for preparing cobalt oxide powder. Background technique [0002] Cobalt oxide powder is widely used in batteries, catalysts, ceramics, pigments, glass and other fields, and at the same time, higher requirements are placed on the particle size and performance of cobalt oxide. Because different application fields have special requirements on the particle size and morphology of cobalt oxide powder, for example, needle-shaped cobalt oxide prepared by oxalate precipitant is mostly used in catalysts, ceramics and other fields; as a battery additive, cobalt oxide is required Oxide powder particles are mostly spherical, and there are special requirements for the particle size and particle size of the powder. The particle size of the cobalt oxide powder prepared by the traditional process is not uniform, and the particle size is relatively large, and the generat...

Claims

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Application Information

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IPC IPC(8): C01G51/04H01M4/62H01M10/42
CPCC01G51/04C01P2002/80C01P2004/61C01P2004/62C01P2006/80H01M4/62H01M10/4235Y02E60/10
Inventor 王文祥刘莹李慧颖方红生黄玲李腾
Owner GUANGDONG POLYTECHNIC OF ENVIRONMENTAL PROTECTION ENG
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