Iron powder

Iron powder and iron fine powder: aggregates of iron particles having a size of less than 1 mm. Colour: Black. It is the main raw material for powder metallurgy. According to the particle size, it is customarily divided into five grades of coarse powder, medium powder, fine powder, fine powder and ultrafine powder. The iron powder composed of particles having a particle size of 150 to 500 μm is a coarse powder, the medium particle size is 44 to 150 μm, the fine powder is 10 to 44 μm, the ultrafine powder is 0.5 to 10 μm, and the ultrafine powder is less than 0.5 μm. powder. Generally, a powder of 325 mesh standard sieve, that is, a particle size of less than 44 μm, is called a sub-silver powder. If higher-precision screening is used, only airflow classification equipment can be used, but for some easily oxidized iron powder, only JZDF can be used. Nitrogen protection classifier to do. Iron powder mainly includes reduced iron powder and atomized iron powder, which are named for different production methods.

Natural ore (iron ore) is processed by crushing, grinding, ore dressing, etc. The ore powder is called concentrate powder.

Concentrate powder is divided into a variety of concentrate powder according to different mineral processing methods, such as magnetic separation, flotation, re-election and other concentrate powder.

Ore raw materials for iron making in iron and steel plants.

The chemical formula is still Fe

Pure metal iron is silvery white, and iron powder is black. This is an optical problem because the iron powder has a small surface area and no fixed geometry, and the crystal structure of the iron block is geometric, so the iron block absorbs a part of visible light. Another part of the visible light is reflected off the mirror to show white; the light that is not absorbed by the iron powder is diffusely reflected, and the visible light that can enter the human eye is less, so it is black.