A preparation system for iron powder for powder metallurgy

Abstract

The invention provides a preparation system of iron powder for powder metallurgy. The preparation system comprises a chain type double-cavity raw material iron powder drying device, wherein the chain type double-cavity raw material iron powder drying device adopts a double-layer structure comprising an upper drying cavity and a lower drying cavity, and the heating and the drying are realized by using afterheat gas exhausted from a tunnel kiln. A raw material iron powder loading device adopts a paper board round sleeve unit, so the surface of obtained primary reducing iron is smooth, and the cleaning is very easy. A tunnel kiln for reducing the iron powder is characterized in that a kiln top water tank covering the whole kiln ceiling is arranged on the top of the kiln wall of a third temperature region, hot water in the kiln top water tank is connected to a heating system and a hot water supply system through a hot water outlet pipe, and the energy sources are greatly saved. A primary reducing iron cleaning and brushing device solves the problems of long-time manual cleaning and brushing in the industry and the harm to the health of cleaning and brushing workers caused by dust. The iron powder for powder metallurgy obtained according to the invention has the advantages of high purity, medium looseness ratio, high compression performance, high intensity and high forming performance, and can be directly manufactured into porous, semi-compact or full-compact materials and products.

Description

technical field [0001] The invention relates to a preparation system of iron powder for powder metallurgy. Background technique [0002] 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. [0003] 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 oil beari...

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Problems solved by technology

[0007] 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 of packing 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

[0008] (3) The direct reduction iron powder tunnel kiln has an old structure, high energy consumption and high production cost

[0009] (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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