Large-scale production method of semi-micron cobalt powder

A production method and technology of cobalt powder, applied in the field of large-scale production of half-micron cobalt powder, can solve the problems of single furnace output, production efficiency to be improved, difficulty in batch production, and need to consume oxalic acid, so as to achieve no need for oxalic acid consumption, reduce The effect of ball milling mixing time and simplifying the process flow

Pending Publication Date: 2022-01-04
JINGMEN GEM NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the half-micron cobalt powder preparation methods and processes adopted in China are relatively complicated and energy-intensive, with relatively high cost, low output of a single furnace, unstable production and difficult mass production.
The patent application number 20101004473.3 discloses a method for manufacturing low-oxygen submicron cobalt powder and its cobalt oxalate precursor. The method prepares the cobalt oxalate precursor through solid-liquid reaction between cobalt carbonate powder and oxalic acid solution, and then It is produced from cobalt oxalate precursor through reduction reaction; the process of this method is complicated, it needs to consume oxalic acid, the cost is high, and the output and production efficiency of a single furnace need to be improved

Method used

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  • Large-scale production method of semi-micron cobalt powder
  • Large-scale production method of semi-micron cobalt powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put cobalt carbonate in a rotary kiln for calcination to obtain tricobalt tetroxide; during calcination, the feed rate of cobalt carbonate is 60kg / h, and the rotation frequency of the main engine of the rotary kiln is 12Hz; The wind frequency is 12Hz, and the calcination time is 3h. The index of cobalt carbonate is: the AD of cobalt carbonate is 0.35g / cm 3 , The particle size D50 is 0.8 μm, and the Fischer particle size is 0.28 μm.

[0026] The tricobalt tetroxide is transported to the distribution bin of the 15-tube reduction furnace through the airflow, the tricobalt tetroxide is put into a bowl and pushed into the furnace tube, and the hydrogen gas is introduced to carry out the reduction reaction to obtain high-temperature cobalt powder. The process conditions for passing cobalt tetroxide into hydrogen for reduction reaction are: hydrogen flow rate is 50m 3 / h, the reduction temperature is 280°C, and the reduction reaction time is 3.5h.

[0027] Cool the high-tem...

Embodiment 2

[0031] Put cobalt carbonate in a rotary kiln for calcination to obtain tricobalt tetroxide; during calcination, the feed rate of cobalt carbonate is 70kg / h, and the rotation frequency of the main engine of the rotary kiln is 10Hz; The air frequency is 15Hz, and the calcination time is 2.8h. The index of cobalt carbonate is: the AD of cobalt carbonate is 0.36g / cm 3 , The particle size D50 is 1.0 μm, and the Fischer particle size is 0.30 μm.

[0032] The tricobalt tetroxide is transported to the distribution bin of the 15-tube reduction furnace through the airflow, the tricobalt tetroxide is put into a bowl and pushed into the furnace tube, and the hydrogen gas is introduced to carry out the reduction reaction to obtain high-temperature cobalt powder. The process conditions for passing cobalt tetroxide into hydrogen for reduction reaction are: the flow rate of hydrogen is 45m 3 / h, the reduction temperature is 200°C, and the reduction reaction time is 3.2h.

[0033] Cool the ...

Embodiment 3

[0037] Put cobalt carbonate in a rotary kiln for calcination to obtain tricobalt tetroxide; during calcination, the feed rate of cobalt carbonate is 80kg / h, and the rotation frequency of the main engine of the rotary kiln is 8Hz; The air frequency is 18Hz, and the calcination time is 2.5h. The index of cobalt carbonate is: the AD of cobalt carbonate is 0.38g / cm 3 , The particle size D50 is 1.2 μm, and the Fischer particle size is 0.35 μm.

[0038] The tricobalt tetroxide is transported to the distribution bin of the 15-tube reduction furnace through the airflow, the tricobalt tetroxide is put into a bowl and pushed into the furnace tube, and the hydrogen gas is introduced to carry out the reduction reaction to obtain high-temperature cobalt powder. The process conditions for passing cobalt tetroxide into hydrogen for reduction reaction are: the hydrogen flow rate is 40m 3 / h, the reduction temperature is 320°C, and the reduction reaction time is 3.0h.

[0039] Cool the high...

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Abstract

The invention discloses a large-scale production method of semi-micron cobalt powder. The method comprises the following steps of (1), calcining cobalt carbonate to obtain cobaltosic oxide; (2), introducing hydrogen into the cobaltosic oxide obtained in the step (1) for a reduction reaction, and obtaining high-temperature cobalt powder; (3), cooling the high-temperature cobalt powder to 10-20 DEG C to obtain cooled cobalt powder; (4), conveying the cooled cobalt powder into an airflow mill through a positive pressure dense phase to be subjected to air breaking, enabling nitrogen to be the atmosphere, conveying the broken materials into a mixer to be mixed, and obtaining the mixed materials; and (5), screening and vacuum packaging the mixed material to obtain a semi-micron cobalt powder finished product with the Fisher particle size of 0.4-0.6 mu m. According to the method, a high-quality sintered alloy product can be obtained, the ball-milling mixing time can be shortened, the sintering temperature can be reduced, and the wear resistance and crack resistance of the hard alloy can be improved.

Description

technical field [0001] The invention belongs to the field of inorganic metal materials, and in particular relates to a large-scale production method of half-micron cobalt powder. Background technique [0002] At present, the half-micron cobalt powder preparation methods and processes adopted in China are relatively complicated and energy-intensive, with relatively high cost, low output of a single furnace, unstable production and difficult mass production. The patent with application number 20101004473.3 discloses a method for manufacturing low-oxygen submicron cobalt powder and its cobalt oxalate precursor. The method prepares the cobalt oxalate precursor through solid-liquid reaction between cobalt carbonate powder and oxalic acid solution, and then It is produced by reduction reaction of cobalt oxalate precursor; the process of this method is complex, requires consumption of oxalic acid, and the cost is high, while the yield and production efficiency of a single furnace n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
CPCB22F9/22
Inventor 许开华吴兵刘玉成全军杨春
Owner JINGMEN GEM NEW MATERIAL
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