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A kind of preparation method of spherical submicron cobalt powder

A micron cobalt powder and submicron technology is applied in the field of preparation of spherical submicron cobalt powder, which can solve the problems of poor particle uniformity and dispersibility, wide particle size distribution and high oxygen content, and achieves a simple and easy-to-control preparation method and high production efficiency. The effect of stable quality and high purity

Active Publication Date: 2016-09-14
YUCHEN ADVANCED ENERGY MATERIALS & TECH WUXI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the submicron cobalt powders currently prepared have wide particle size distribution, high oxygen content, and poor particle uniformity and dispersion.

Method used

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  • A kind of preparation method of spherical submicron cobalt powder

Examples

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preparation example Construction

[0025] see figure 1 , the invention discloses a preparation method of spherical submicron cobalt powder, comprising steps:

[0026] The step of making the complexed cobalt salt solution: dissolving the cobalt salt and the surfactant in water and stirring evenly, adding a complexing agent into the cobalt salt solution for mixing and reacting;

[0027] The steps of making the reducing agent solvent: dissolving the reducing agent in water;

[0028] Heating the complexed cobalt salt solution, adding alkali to the complexed cobalt salt solution to make it alkaline; then mixing the reducing agent solvent with the complexed cobalt salt solution, and obtaining a submicron cobalt powder filter cake through solid-liquid separation, which is washed and removed Impurities in the filter cake; the washed filter cake is washed with absolute ethanol to remove water; the submicron cobalt powder filter cake washed with absolute ethanol is vacuum dried to remove ethanol and trace moisture to ob...

Embodiment 1

[0040] A preparation method of submicron cobalt powder, comprising:

[0041] 0.225 mol CoCl 2 Dissolve 4.5g of PVP in water and mix evenly, then add 0.135mol ammonia water and stir well to obtain 450ml complex cobalt salt solution; mix 0.43molN 2 h 4 ·H 2 O and 0.02 mol sodium borohydride are miscible in water to obtain 450ml reducing agent solvent;

[0042] Heat the complexed cobalt salt solution to 80°C, adjust the pH value of the complexed cobalt salt solution to 12.0 with 6.0mol / L sodium hydroxide solution, and then add the reducing agent solvent into the complexed cobalt salt solution for 30 minutes. The temperature of the reaction system was maintained at 80°C for 40 minutes, and then cold water was added to cool to room temperature (10-30°C); the reaction product was centrifuged, the filter cake was washed with water to remove impurities in the filter cake, and the waste water was treated centrally; The cake is washed with absolute ethanol to remove water, and the a...

Embodiment 2

[0044] A preparation method of submicron cobalt powder, comprising:

[0045] 0.35 mol CoSO 4 Dissolve 7.0g of PVA in water and mix evenly, then add 0.175mol ethylenediamine and stir thoroughly to obtain 350ml complex cobalt salt solution; mix 1.65molN 2 h 4 ·H 2 0.01 mol potassium borohydride is miscible in water to obtain 550ml reducing agent solvent;

[0046] Heat the complexed cobalt salt solution to 60°C, adjust the pH value of the complexed cobalt salt solution to 11.5 with 2.0mol / L potassium hydroxide solution, then add the reducing agent solvent into the complexed cobalt salt solution, and the feeding time is 50min , the temperature of the reaction system was maintained at 60°C for 50 minutes, and then cold water was added to cool to room temperature (10-30°C); the reaction product was centrifuged, the filter cake was washed with water to remove impurities in the filter cake, and the waste water was treated centrally; The filter cake is washed with absolute ethanol ...

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Abstract

The invention discloses a preparation method of spherical submicron cobalt powder. The preparation method comprises the steps of: preparing a complexed cobalt salt solution: dissolving cobalt salt and a surfactant in water and stirring evenly, adding a complexing agent to the cobalt Mixing and reacting in the salt solution; the steps of making the reducing agent solvent: dissolving the reducing agent in water; heating the complexed cobalt salt solution, adding alkali to the complexed cobalt salt solution to make it alkaline; then mixing the reducing agent solvent and The complexed cobalt salt solution is mixed, and the submicron cobalt powder filter cake is obtained through solid-liquid separation, and the impurities in the filter cake are removed by washing; the washed filter cake is washed with absolute ethanol to remove water; the submicron cobalt powder after washing with absolute ethanol The powder filter cake is vacuum dried to remove ethanol and trace moisture to obtain spherical submicron cobalt powder. The spherical submicron cobalt powder produced by the invention has narrow particle size distribution, low oxygen content, better particle uniformity and dispersibility.

Description

technical field [0001] The invention relates to the technical field of ultrafine material preparation, and more specifically, relates to a preparation method of spherical submicron cobalt powder. Background technique [0002] Due to its special physical and chemical properties, ultrafine cobalt powder shows many excellent properties in the application of cemented carbide, batteries, catalysts, magnetic materials, absorbing materials, ceramics and other fields. Scientific practice has proved that when a substance is processed to an extremely fine size, surface effects, volume effects and quantum effects will occur, resulting in changes in physical and chemical properties. [0003] With the continuous development of science and technology, the performance requirements of powder materials in different application fields are constantly increasing. For example, in the preparation of ultra-fine cemented carbide, cobalt powder is required to have a Fischer particle size of less tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 何爱山
Owner YUCHEN ADVANCED ENERGY MATERIALS & TECH WUXI
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