Preparing method of iron powder for powder metallurgy

Abstract

The invention provides a preparing system of iron powder for powder metallurgy. The preparing system comprises a chain-type dual-chamber raw material drying device, structure of an upper drying chamber and a lower drying chamber is adopted, and gas with waste heat discharged from a tunnel kiln is utilized to heat and dry. A raw-material iron powder loading device adopts a paper-board round sleeve unit, so that the surface of obtained primarily reduced iron is smooth and easy to clean. According to the tunnel kiln used for reduced iron powder, a kiln top water tank covering the entire kiln top is mounted on the top of the kiln wall in a third temperature zone, hot water in the kiln top water tank is leaded into a heat supply system and a hot water supply system through hot water discharging pipes, and energy is saved greatly. According to a reduced iron cleaning device, the problem of long-time manual cleaning in the industry is solved, and health hazards of cleaning workers due to dust are eliminated. The iron powder produced by a method for powder metallurgy is high in purity, medium in Poisson ratio, and high in compression, strength and formability, and can be used for producing porous, semi-dense or fully dense material and products.

Description

[0001] technical field [0002] The invention relates to a method for preparing iron powder for powder metallurgy. Background technique [0003] Powder metallurgy is a technology for producing metal or using metal powder as raw material, forming and sintering to manufacture metal materials, composite materials and various types of products. Powder metallurgy has similarities with the production of ceramics. Therefore, a series of new powder metallurgy technologies can also be used for the preparation of ceramic materials. Due to the advantages of powder metallurgy technology, it has become the key to solve the problems of new materials and plays a pivotal role in the development of new materials. [0004] Powder metallurgy has unique chemical composition and mechanical and physical properties, which cannot be obtained by traditional casting methods. The use of powder metallurgy technology can directly make porous, semi-dense or fully dense materials and products, such as o...

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Problems solved by technology

[0008] Problem is: owing to will circle outer cylinder 27, circle inner cylinder 28 hang out, the 3rd fixed rib 25 will pass through the raw material iron powder that packs in the cavity between circle outer cylinder 27, circle inner cylinder 28, will Make the surface of the raw iron powder slide out of the deep groove, and the coal powder in contact will be scattered into the deep groove on the surface of the raw iron powder, so that the coal in the deep groove on the surface of the obtained direct reduction iron powder needs to be manually cleaned by a large amount of manpower. Increase cleaning costs and seriously affect product quality

[0009] (3) The direct reduction iron powder tunnel kiln has an old structure, high energy consumption and high production cost

[0010] (4) There is no cleaning device for primary reduced iron, and manual cleaning is used for primary reduced iron, which requires many people, makes cleaning very difficult, labor-intensive, cleaning is not clean, and the efficiency is low

There are many impurities in the primary reduced iron and iron powder after being selected by the magnetic separator, which affects the purity and quality of the primary reduced iron and iron powder

The obtained primary reduced iron powder has high impurity content, which cannot meet the technical requirements of iron powder for powder metallurgy

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