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Method for preventing self-combustion of ultrafine carbonyl iron powder

A carbonyl iron powder and carbonyl iron technology are applied in the field of preventing the spontaneous combustion of ultrafine carbonyl iron powder, can solve problems such as explosion and easy combustion, and achieve the effects of complete disinfection, simple operation and easy realization.

Active Publication Date: 2007-04-25
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 produced unsterilized iron powder into the sterilization chamber, and supplement nitrogen containing a small amount of oxygen into the sterilization 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 the inflation for 10s, open the exhaust valve, when the pressure drops to 0.02MPa, the exhaust valve is closed, and the automatic adjustment valve replenishes nitrogen into the disinfection chamber again. This was carried out 10 times, and the iron powder released was detected by a CO detector. The concentration of CO contained in the gas in the powder was 24 ppm, which reached the national standard of 30 ppm, and no fire occurred.

Embodiment 2

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

Embodiment 3

[0014] Put the unsterilized iron powder into the sterilization chamber, and supplement nitrogen containing a small amount of oxygen into the sterilization chamber through the automatic regulating valve. The volume percentage of oxygen in the nitrogen is 8%; when it reaches 0.15MPa, stop the inflation. Stop for 10s, the exhaust valve opens, when the pressure drops to 0.02MPa, the exhaust valve closes, and the automatic adjustment valve replenishes nitrogen into the sterilization chamber again. This was carried out 10 times, and the iron powder released was detected by a CO detector. The concentration of CO contained in the gas in the powder was 22 ppm, which reached the national standard of 30 ppm, 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 ultrafine carbonyl iron powder relates to a method for preventing spontaneous combustion of materials during the discharging process of the production process of ultrafine carbonyl iron powder. Background technique [0002] Carbonyl iron powder has a very high activity. It is very easy to burn during the discharge process of the production process of ultra-fine carbonyl iron powder, accompanied by the release of flammable and explosive gases, and there may be a danger of explosion. Among them, the hazardous gases are CO associated with the production process and carbonyl iron gas which is not completely decomposed. 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 carbonyl nickel gas, so that the powder pro...

Claims

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Application Information

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Patent Type & Authority Applications(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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