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Method for preventing self-combustion of ultrafine carbonyl iron powder

A technology of carbonyl iron powder and carbonyl iron, which is applied in the field of preventing spontaneous combustion of ultra-fine carbonyl iron powder, can solve the problems of explosion and easy combustion, and achieve the effect of complete disinfection, simple operation and easy realization

Active Publication Date: 2009-02-25
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The activity of carbonyl iron powder is very high. It is easy to burn and may cause explosion during the discharge process of ultrafine carbonyl iron powder production process, accompanied by the release of flammable and explosive gases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Put the unsterilized iron powder in the disinfection chamber, and supplement the nitrogen containing a small amount of oxygen into the disinfection chamber through the automatic regulating valve. The volume percentage of oxygen in the nitrogen is 4%; when the pressure of the sterilization chamber reaches 0.1MPa, Stop inflation for 10s, open the exhaust valve, when the pressure drops to 0.02MPa, the exhaust valve closes, and the automatic regulating valve replenishes nitrogen into the disinfection chamber again. This was done 10 times, and the released iron powder was detected by a CO detector. The concentration of CO contained in the gas in the powder was 24ppm, which reached the national standard of 30ppm, and no fire occurred.

Embodiment 2

[0012] Put the unsterilized iron powder into the disinfection chamber, and supplement nitrogen containing a small amount of oxygen into the disinfection chamber through the automatic regulating valve. The volume percentage of oxygen in the nitrogen is 6%; when it reaches 0.1MPa, stop inflating. After stopping for 10s, the exhaust valve is opened, and when the pressure drops to 0.02MPa, the exhaust valve is closed, and the automatic regulating valve replenishes nitrogen into the disinfection chamber again. This was done 15 times, and the released iron powder was detected by a CO detector. The concentration of CO contained in the gas in the powder was 19ppm, which reached the national standard of 30ppm, and no fire occurred.

Embodiment 3

[0014] Put the unsterilized iron powder into the disinfection chamber, and add nitrogen containing a small amount of oxygen to the disinfection chamber through the automatic regulating valve. The volume percentage of oxygen in the nitrogen is 8%; when it reaches 0.15MPa, stop inflation. After stopping for 10s, the exhaust valve is opened, and when the pressure drops to 0.02MPa, the exhaust valve is closed, and the automatic regulating valve replenishes nitrogen into the disinfection chamber again. This was done 10 times, and the released iron powder was detected by a CO detector. The concentration of CO contained in the gas in the powder was 22ppm, which reached the national standard of 30ppm, and no fire occurred.

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Abstract

The invention discloses a self-combustion preventing method in the discharging course of ultrafine carbonyl ferric powder, which is characterized by the following: aerating little oxygen through nitrogen from powder bin bottom into powder with CO and carbonyl ferric gas; stirring the powder; contacting the nitrogen and powder completely; reacting oxygen in the microdose nitrogen on the powder surface and powder to form oxide film; reducing surface activity of carbonyl ferric powder; replacing CO gas and little carbonyl ferric gas.

Description

technical field [0001] A method for preventing spontaneous combustion of superfine carbonyl iron powder relates to a method for preventing spontaneous combustion of materials during the discharge process of superfine carbonyl iron powder production process. Background technique [0002] The activity of carbonyl iron powder is very high. When it is used in the discharge process of ultra-fine carbonyl iron powder production process, it is very easy to burn and may cause explosion during the process of releasing flammable and explosive gases. The hazardous gases are CO and incompletely decomposed iron carbonyl gas accompanying the production process. In the production process, the accompanying CO gas and trace nickel carbonyl gas are highly toxic, flammable, and explosive media, so this part of the gas in the powder must be sterilized to ensure that the powder product does not contain CO gas and nickel carbonyl gas to make the powder product harmless, and it is also necessary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/16
Inventor 李永军张强林谭世雄肖冬明王多冬刘军位李朝平王大窝刘俊
Owner JINCHUAN GROUP LIMITED
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