Method of manufacturing micro and sub-micron iron powder

A sub-micron and micron-level technology, which is applied in the preparation of sub-micron-level iron powder and micron-level field, can solve the problems of difficult iron powder and high energy consumption, and achieve high reduction rate of iron powder, low energy consumption and easy preparation Effect

Active Publication Date: 2007-08-08
CENT IRON & STEEL RES INST
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  • Description
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Problems solved by technology

Due to the metal ductility of metallic iron, it is difficult to prepare micron-sized and sub-micron-sized iron powder, and the energy consumption is high

Method used

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  • Method of manufacturing micro and sub-micron iron powder
  • Method of manufacturing micro and sub-micron iron powder
  • Method of manufacturing micro and sub-micron iron powder

Examples

Experimental program
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Embodiment Construction

[0034] The implementation of the method of the present invention is to put the analytically pure iron oxide powder in a stirring ball mill with heating function, and feed nitrogen or argon to drive out the air in the ball mill. Start the agitating ball mill to grind the iron oxide powder to below 10 microns, and raise the temperature inside the ball mill to 200-400°C. Switch nitrogen or argon with reducing gas to start reduction, and remove H from the tail gas leaving the ball mill 2 O / CO 2 Finally, after being pressurized by a gas booster, it can be reused. During the experiment, hydrogen, CO, CO 2, Nitrogen, Argon, and Oxygen are commercially produced 99.99% pure gases, and water vapor is obtained through a steam generator. The gas composition is adjusted through a multi-channel gas control system, and an online gas analyzer is used to dynamically monitor changes in gas content. After the reduced iron powder is cooled, it contains CO 2 The passivation gas is used to pass...

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Abstract

The invention relates to the making of micron and sub-micron metal powder, which firstly ball grinds the oxidized metal powder with heating environment, entering nitrogen or argon gas or their mixture till the content of metal powder <=10 micron, heating it to 200-400deg.C, feeding recovery gas H2 or mixture of H2 and CO to switch nitrogen and argon or their mixture for 30-6000 min, removing the water and CO2, boosting to back to the ball grinding for reaction, inactivating the recovered iron powder. It is low in cost and energy consumption, simple in production process, easy in making, suitable for mass production.

Description

technical field [0001] The invention belongs to the field of powder metallurgy preparation, in particular to a method for preparing micron-level and submicron-level iron powder. Background technique [0002] In the prior art, micron and submicron iron powders are one of the basic raw materials for the powder metallurgy industry. The particle size of the micron-sized iron powder is 1-10 microns, and the particle size of the sub-micron-sized iron powder is 0.1-1 micron. Micron and submicron iron powders have large specific surface area and activity, and are mainly used in powder metallurgy, manufacturing mechanical parts, producing friction materials, anti-friction materials, superhard materials, magnetic materials, lubricants and their products, etc. In recent years, it also has broad application prospects in many fields such as electromagnetics, biology, medicine, and optics. [0003] Most of traditional iron powder is produced by reduction method. The reduction method mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
Inventor 赵沛郭培民
Owner CENT IRON & STEEL RES INST
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