CN100463863C - Method for preventing self-combustion of ultrafine carbonyl iron powder - Google Patents
Method for preventing self-combustion of ultrafine carbonyl iron powder Download PDFInfo
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- CN100463863C CN100463863C CNB2006101453409A CN200610145340A CN100463863C CN 100463863 C CN100463863 C CN 100463863C CN B2006101453409 A CNB2006101453409 A CN B2006101453409A CN 200610145340 A CN200610145340 A CN 200610145340A CN 100463863 C CN100463863 C CN 100463863C
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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
A kind of method that prevents self-combustion of ultrafine carbonyl iron powder relates to a kind ofly in the blowing process of superfine iron carbonyl powder production process, prevents the method for material spontaneous combustion.
Background technology
The carbonyl iron dust activity is very high, plants in the blowing process of superfine iron carbonyl powder production process, and in the process of following flammable explosive gas to emit, the as easy as rolling off a log burning may produce the danger of blast in addition.Harm gas wherein is the CO that accompanies with production process and does not decompose iron carbonyl gas completely.In process of production, the nickel carbonyl gas of CO gas of following and trace, it all is hypertoxic, inflammable, explosive medium, so must be to this part the gas disinfection in the powder, guarantee not contain in the powder product CO gas and nickel carbonyl gas, make powder product not have harm, also need seek the method that prevents self-combustion of ultrafine carbonyl iron powder simultaneously.
Summary of the invention
The objective of the invention is the problem that exists at above-mentioned prior art, can be effectively slow oxidation be carried out on the iron powder surface and handled, thoroughly replace the CO gas in the powder and the method that prevents self-combustion of ultrafine carbonyl iron powder of micro-nickel carbonyl gas.
To achieve these goals, the present invention by the following technical solutions.
A kind of method that prevents self-combustion of ultrafine carbonyl iron powder, it is characterized in that its process adopts the nitrogen that charges into trace oxygen, contain the powder of CO gas and micro-iron carbonyl gas from the feeding of powder warehouse bottom, powder stirs simultaneously, nitrogen is fully contacted with powder, and the oxygen of trace can react at powder surface and powder in the nitrogen, forms oxide film, reduce the surfactivity of carbonyl iron dust, replaced wherein CO gas and micro-iron carbonyl gas simultaneously.
A kind of method that prevents self-combustion of ultrafine carbonyl iron powder of the present invention, it is characterized in that replacing volume percent content oxygenous in the nitrogen of usefulness is 4%～8%.
Method of the present invention adds a spot of oxygen in sterilization metathetical nitrogen, slow oxidation is carried out on the iron powder surface handled; Feed nitrogen from the bottom of warehouse, make it to form abundant metathetical passage; Powder is stirred, nitrogen is fully contacted with powder, thoroughly replace CO gas and micro-nickel carbonyl gas in the powder.Easy and simple to handle, sterilization is easy to realize fully.After testing, the iron powder behind the oxidation sterilizing not catch fire phenomenon, does not contain CO gas and micro-nickel carbonyl gas in the iron powder substantially, and the CO total content reaches service requirements less than 1mg/L.
Embodiment
A kind of method that prevents self-combustion of ultrafine carbonyl iron powder, its process adopts the nitrogen that charges into trace oxygen, contain the powder of CO gas and micro-iron carbonyl gas from the feeding of powder warehouse bottom, powder stirs simultaneously, nitrogen is fully contacted with powder, and the oxygen of trace can react at powder surface and powder in the nitrogen, forms oxide film, reduce the surfactivity of carbonyl iron dust, replaced wherein CO gas and micro-iron carbonyl gas simultaneously.Oxygenous volume percent content is 4%～8% in the nitrogen of displacement usefulness.
Embodiment 1
With output not the disinfectant iron powder put to the sterilization storehouse, in the sterilization storehouse, replenish the nitrogen contain minor amounts of oxygen by automatic regulating valve, the volume percent content of the oxygen in the nitrogen is 4%; When sterilization storehouse pressure reaches 0.1MPa, stop to inflate 10s, open vent valve, when pressure is reduced to 0.02MPa, exhaust valve closure, automatic regulating valve replenishes nitrogen once more in the sterilization storehouse.So carry out 10 times, by carbon monoxide detector the iron powder of emitting is detected, to contain the concentration of CO be 24ppm to gas in the powder, reaches the standard of national 30ppm, the phenomenon of catching fire.
Embodiment 2
With output not the disinfectant iron powder put to the sterilization storehouse, in the sterilization storehouse, replenish the nitrogen contain minor amounts of oxygen by automatic regulating valve, the volume percent content of the oxygen in the nitrogen is 6%; When reaching 0.1MPa, stop inflation.Stop 10s, vent valve is opened, when pressure is reduced to 0.02MPa, and exhaust valve closure, automatic regulating valve replenishes nitrogen once more in the sterilization storehouse.So carry out 15 times, by carbon monoxide detector the iron powder of emitting is detected, to contain the concentration of CO be 19ppm to gas in the powder, reaches the standard of national 30ppm, the phenomenon of catching fire.
Embodiment 3
With output not the disinfectant iron powder put to the sterilization storehouse, in the sterilization storehouse, replenish the nitrogen contain minor amounts of oxygen by automatic regulating valve, the volume percent content of the oxygen in the nitrogen is 8%; When reaching 0.15MPa, stop inflation.Stop 10s, vent valve is opened, when pressure is reduced to 0.02MPa, and exhaust valve closure, automatic regulating valve replenishes nitrogen once more in the sterilization storehouse.So carry out 10 times, by carbon monoxide detector the iron powder of emitting is detected, to contain the concentration of CO be 22ppm to gas in the powder, reaches the standard of national 30ppm, the phenomenon of catching fire.
Claims (2)
1. method that prevents self-combustion of ultrafine carbonyl iron powder, it is characterized in that its process adopts the nitrogen that charges into trace oxygen, contain the powder of CO gas and micro-iron carbonyl gas from the feeding of powder warehouse bottom, powder stirs simultaneously, nitrogen is fully contacted with powder, and the oxygen of trace can react at powder surface and powder in the nitrogen, forms oxide film, reduce the surfactivity of carbonyl iron dust, replaced wherein CO gas and micro-iron carbonyl gas simultaneously.
2. a kind of method that prevents self-combustion of ultrafine carbonyl iron powder according to claim 1, it is characterized in that replacing volume percent content oxygenous in the nitrogen of usefulness is 4%～8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101453409A CN100463863C (en) | 2006-11-24 | 2006-11-24 | Method for preventing self-combustion of ultrafine carbonyl iron powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101453409A CN100463863C (en) | 2006-11-24 | 2006-11-24 | Method for preventing self-combustion of ultrafine carbonyl iron powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1951825A CN1951825A (en) | 2007-04-25 |
| CN100463863C true CN100463863C (en) | 2009-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101453409A Active CN100463863C (en) | 2006-11-24 | 2006-11-24 | Method for preventing self-combustion of ultrafine carbonyl iron powder |
Country Status (1)
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| CN (1) | CN100463863C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4155748A (en) * | 1976-10-14 | 1979-05-22 | Basf Aktiengesellschaft | Manufacture of ferromagnetic metal particles consisting essentially of iron |
| US4420330A (en) * | 1981-04-25 | 1983-12-13 | Basf Aktiengesellschaft | Stabilization of pyrophoric ferromagnetic acicular metal particles consisting essentially of iron |
-
2006
- 2006-11-24 CN CNB2006101453409A patent/CN100463863C/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4155748A (en) * | 1976-10-14 | 1979-05-22 | Basf Aktiengesellschaft | Manufacture of ferromagnetic metal particles consisting essentially of iron |
| US4420330A (en) * | 1981-04-25 | 1983-12-13 | Basf Aktiengesellschaft | Stabilization of pyrophoric ferromagnetic acicular metal particles consisting essentially of iron |
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| Publication number | Publication date |
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| CN1951825A (en) | 2007-04-25 |
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Owner name: JINCHUAN GROUP CO., LTD. Free format text: FORMER NAME: JINCHUAN GROUP CORP., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 737103 Jinchuan Road, Gansu, China, No. 98, No. Patentee after: Jinchuan Group Co., Ltd. Address before: 737103 Jinchuan Road, Gansu, China, No. 98, No. Patentee before: Jinchuan Group Corp., Ltd. |