Preparation method for metallic cobalt microspheres

A technology of metal cobalt and microspheres, applied in metal processing equipment, transportation and packaging, etc., to achieve the effect of enhancing automatic production, reducing energy consumption, and reducing agglomeration

Active Publication Date: 2016-11-09
HUZHOU TEACHERS COLLEGE
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  • Preparation method for metallic cobalt microspheres
  • Preparation method for metallic cobalt microspheres
  • Preparation method for metallic cobalt microspheres

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[0033] A preparation method of metal cobalt microspheres provided by the present invention comprises the following four key process steps.

[0034] The first step is to prepare micron-sized spherical cobalt hydroxide by hydrothermal method. The preparation of various forms of nano-micron cobalt hydroxide by hydrothermal method has been generally recognized. The key to preparing spherical cobalt hydroxide is to carry out the precipitation and dissolution equilibrium of cobalt hydroxide in the system gently, that is, to control the reasonable pH value and the concentration of cobalt ions in the solution at a lower temperature. In this process, there are cobalt ions, ammonium ions, hydroxide ions, EDTA, ammonia molecules, cobalt hydroxide and other substances in the solution, and there are various reaction balances between the above molecules or ions, and complex ions are generated. By calculating the corresponding equilibrium coefficients and complexation equilibrium constants,...

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Abstract

The invention relates to a preparation method for metallic cobalt microspheres. The preparation method comprises the following steps that (1) a cobalt source mother solution is prepared from cobalt nitrate and EDTA, and ammonium hydroxide and water are added into the solution, so that the pH value of the solution is made to be 12.4; then the solution is transferred into a reaction still, a high-purity metallic cobalt plate is added to serve as a substrate, a hydrothermal reaction is conducted at the temperature of 90-120 DEG C, and flushing and drying are conducted; (2) the micron-grade spherical cobaltous hydroxide and the metallic cobalt plate are directly sent to a muffle furnace, the rate of temperature increase is controlled to be 1-10 DEG C per minute, the final temperature is controlled to be 250-350 DEG C, and heat preservation is conducted for 3-5 hours; (3) micron-grade spherical cobaltosic oxide which is cooled to the temperature around 200 DEG C and the metallic cobalt plate are directly sent into a reduction furnace, the air pressure is controlled to be 0.24-0.35 Mpa, the rate of temperature increase is controlled to be 10-20 DEG C per minute, the final temperature is controlled to be 600-800 DEG C, and heat preservation is conducted for 2-3 hours; and (4) static electricity of cooled metallic cobalt microspheres is eliminated by means of an ionic fan, and then the metallic cobalt microspheres are subjected to multi-stage airflow winnowing for eliminating large particles with the diameters being 20 [um]m or above.

Description

technical field [0001] The invention relates to a preparation method of metal cobalt microspheres. Background technique [0002] The existing application fields of spherical metal powder include powder metallurgy, 3D metal printing, battery, electronic packaging, precision preparation, etc. At present, the preparation methods of spherical metal particles are mainly crushing method (obtaining fine powder by crushing coarse particles or molten liquid) and synthesis method (obtaining fine powder by reaction, nucleation and growth, collection and post-treatment of ions, atoms and molecules). body method) two categories. For the former, the pulverization method can be roughly divided into three categories: gas atomization method and centrifugal atomization method based on droplet jet solidification into balls; shredding or punching remelting method based on mechanical shearing into balls; uniform droplet injection method and pulsed orifice jetting. The main disadvantages of th...

Claims

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Application Information

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IPC IPC(8): B22F9/22
CPCB22F9/22B22F1/065
Inventor 陈海锋童艳花王永亚徐敏虹唐培松潘国祥
Owner HUZHOU TEACHERS COLLEGE
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