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Antioxidative method for superfine chemical nickel powder

An ultra-fine chemical and anti-oxidation technology, which is applied in the field of anti-oxidation, can solve problems such as spontaneous combustion, and achieve good effect and simple operation

Inactive Publication Date: 2006-08-16
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the anti-oxidation technology of powder in the existing technology is generally post-processing of powder output, such as follow-up anti-oxidation technology of copper powder and copper coated powder, silver powder and silver coated powder, etc., due to ultrafine chemical nickel powder The activity of the powder is very high, and it will be oxidized within a few seconds when exposed to the air, and even spontaneous combustion will occur. Therefore, it is impossible to carry out anti-oxidation treatment after the powder is discharged. Obviously, it is taken out in a reducing atmosphere for anti-oxidation treatment or using additives can't be done

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Heating to the specified temperature in the closed system reduction furnace, and then reducing with hydrogen, after the reduction is completed, start to cool down, when the temperature drops to 160°C, open the valve of the nitrogen cylinder, adjust the valves of the hydrogen and nitrogen cylinders, and use the flow meter to indicate When the flow ratio of nitrogen and hydrogen is 4:1, continue to cool down to 80°C, close the valve of the hydrogen cylinder, and only pass nitrogen. When the temperature in the closed system drops to 45°C, stop nitrogen flow, open the closed system, and take out the The reduced ultra-fine nickel powder is quickly put into a sealed bag, filled with nitrogen and sealed, and taken out after 24 hours of storage. The appearance of the ultra-fine nickel powder is a loose black powder, and the hydrogen loss value is less than 2.0%.

Embodiment 2

[0014] Heating to the specified temperature in the reduction furnace of the closed system, and then reducing with hydrogen, after the reduction is completed, start to cool down, when the temperature drops to 140°C, open the valve of the nitrogen cylinder, adjust the valves of the hydrogen and nitrogen cylinders, and use the flow meter It is indicated that the flow ratio of nitrogen and hydrogen is 5:1, continue to cool down to 75°C, close the valve of the hydrogen cylinder, and only pass nitrogen, and when the temperature in the closed system drops to 50°C, stop nitrogen, open the closed system, and take out the The reduced ultra-fine nickel powder is quickly put into a sealed bag, filled with nitrogen and sealed, and taken out after 24 hours of storage. The appearance of the ultra-fine nickel powder is a loose black powder, and the hydrogen loss value is less than 2.0%.

[0015] Example 2

[0016] Heating to the specified temperature in the reduction furnace of the closed sys...

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PUM

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Abstract

An antioxidizing process for the superfine chemical Ni powder includes such steps as preparing superfine chemical Ni powder by using H2 to reduce superfine nickel oxalate in a sealed system, continuously filling H2 to lower temp to 130-160 deg.C, beginning to fill N2 or inertial gas, increasing the flow of N2 or inertial gas while decreasing the flow of H2 until their volume-flow ratio is (4-6):1, cooling to 70-80 deg.C, and continuously increasing the flow of N2 or inertial gas until the flow of H2 is zero. The N2 or inertial gas is adsorbed by the surface of Ni particle to generate a layer of passivated film.

Description

technical field [0001] The invention relates to an anti-oxidation method of superfine chemical nickel powder, which relates to a method for producing superfine nickel powder by a chemical method, in particular to an anti-oxidation method thereof. Background technique [0002] With the rapid development of modern electronics, magnetic materials, conductive paste, catalysts, parts, high-capacity batteries, organic synthesis, aerospace devices and other major industries, the requirements for powder products are getting higher and higher, not only the relative purification of chemical components, Higher requirements are put forward for some physical properties of powder products. With the further development of the modern new material industry, the particle size of the powder tends to be more and more refined. Using nickel salt as raw material, the ultrafine chemical nickel powder with a particle size of less than 10um is produced after reduction with very high activity. In the ...

Claims

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Application Information

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IPC IPC(8): B22F9/22
Inventor 陈自江汪锦瑞段建军陈泞来颜智宏
Owner JINCHUAN GROUP LIMITED
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