A kind of preparation method of iron powder for powder metallurgy

Abstract

The invention provides a preparation system of iron powder for powder metallurgy, which includes a chain-type double-chamber raw material iron powder drying device, which adopts a double-layer upper drying chamber and lower drying chamber structure, and uses the waste heat gas discharged from the tunnel kiln to heat dry. The raw iron powder charging device adopts a cardboard circular sleeve unit, which makes the surface of the obtained primary reduced iron smooth and easy to clean. A tunnel kiln for reducing iron powder. A kiln roof water tank covering the entire kiln roof is installed on the top of the kiln wall in the third temperature zone. The hot water in the kiln roof water tank is connected to the heating system and hot water supply through the hot water outlet pipe. system, greatly saving energy. The one-time reduced iron cleaning device solves the long-term manual cleaning in the industry and eliminates the health hazards of dust to cleaning workers. The iron powder for powder metallurgy obtained by the invention has high purity, medium loose ratio, high compressibility, high strength and high formability, and can be directly made into porous, semi-dense or full-dense materials and products.

Description

technical field [0001] The invention relates to a method for preparing 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 bearin...

AI Technical Summary

Problems solved by technology

[0007] Problem is: owing to will circle outer tube 27, circle inner tube 28 hang out, the 3rd fixed rib 25 will pass through the raw material iron powder that packs in the cavity between circle outer tube 27, circle inner tube 28, will make The surface of the raw iron powder slides 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 with a lot of manpower, increasing Clean up costs, but also 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 powder after being selected by the magnetic separator, which affects the purity and quality of the primary reduced 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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