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Production of superfine cobalt powder by air-flow breaking process

A technology of jet milling and ultrafine cobalt powder, which is applied in the field of jet milling to produce ultrafine cobalt powder, which can solve the problems of increasing oxygen content, cobalt powder surface oxidation, and affecting the performance of cobalt powder, so as to improve dispersion and hard alloy Improved performance and higher specific surface area

Inactive Publication Date: 2006-08-16
JINCHUAN GROUP LIMITED
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, there are many methods for crushing materials. The conventional crushing method is used to produce ultra-fine cobalt powder, which can generally meet the particle size requirements, but the cobalt powder is prone to surface oxidation during the crushing process, which increases the oxygen content and affects the performance of the cobalt powder.

Method used

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  • Production of superfine cobalt powder by air-flow breaking process
  • Production of superfine cobalt powder by air-flow breaking process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The cobalt powder reduced by cobalt oxalate was used as the protective atmosphere with nitrogen, and the crushing pressure was controlled at 0.6MPa. The results before and after crushing are shown in Table 1:

[0014] Table 1-Comparison of results before and after cobalt powder pulverization

[0015]

[0016] It can be seen from Table 1 that after pulverization of cobalt powder with a particle size between 20 μm and 130 μm, the particle size and oxygen content can meet the requirements, and the maximum oxygen content increases by 400 ppm.

Embodiment 2

[0018] The cobalt powder reduced by cobalt oxalate was used as the protective atmosphere with nitrogen, and the crushing pressure was controlled at 0.45MPa. The results before and after crushing are shown in Table 2:

[0019] Table 2-Comparison of results before and after cobalt powder pulverization

[0020]

[0021] It can be seen from Table 2 that after cobalt powder with a particle size between 25 μm and 65 μm is pulverized, the particle size and oxygen content can meet the requirements, and the maximum oxygen content increases by 400 ppm.

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Abstract

A process for preparing superfine Co powder by airflow breaking method features that the closed-loop circulated high-pressure inertial gas is used as the breaking airflow and protecting gas to break the spongy Co particles prepared by cobalt oxalate reduction, preventing the oxidizing to Co powder.

Description

technical field [0001] The invention discloses a method for producing superfine cobalt powder by airflow pulverization, which relates to a method for pulverizing sponge powder reduced with cobalt oxalate by airflow pulverization. Background technique [0002] Ultrafine cobalt powder is widely used in the fields of cemented carbide, superalloy, cermet, and diamond tool manufacturing, and is also used in secondary batteries as an additive to improve the performance of materials. The cobalt powder reduced with cobalt oxalate is sponge-like, with a particle size of 25 μm to 100 μm, poor dispersion, and an oxygen content of 0.25% to 0.30%. It must be processed before it can be used. At present, there are many methods for crushing materials. The conventional crushing method is used to produce ultra-fine cobalt powder, which can generally meet the particle size requirements, but the cobalt powder is prone to surface oxidation during the crushing process, which increases the oxygen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
Inventor 武浚张有新雷军鹏石育林郇泽泉
Owner JINCHUAN GROUP LIMITED
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