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Iron Powder Production Method

wallpapers Industry 2021-01-11
Iron powder is an aggregate of iron particles with a size of less than 1mm. The color is black. It is the main raw material for powder metallurgy.
 
According to the particle size, it is customarily divided into five grades: coarse powder, medium powder, fine powder, fine powder and superfine powder. The iron powder composed of particles in the range of 150~500μm is coarse powder, the particle size is 44~150μm as medium powder, 10~44μm is fine powder, 0.5~10μm is very fine powder, and less than 0.5μm is superfine powder. Generally, the powder that can pass through the 325 mesh standard sieve, that is, the particle size is less than 44μm, is called sub-sieve powder. For higher-precision screening, you can only use air classification equipment, but for some easily oxidized iron powder, you can only use JZDF. Nitrogen protection classifier to do it.
 
Iron powder mainly includes reduced iron powder and atomized iron powder, which are named after different production methods.

 
Hoganas Process is a solid carbon-hydrogen two-step reduction process developed by Hoganas in Sweden. First, the iron concentrate powder (total iron% 26ge; 71.5%, SiO2% 26lt; 0.5%) and low-sulfur coke shavings-limestone powder (for desulfurization) mixed reducing agent are interlayer filled in the SiC reduction vessel, through The tunnel kiln is heated to about 1200°C to reduce the mineral powder to sponge iron. After the sponge iron is broken into smaller than 0.175mm (-80 mesh) or smaller than 0.14mm (-100 mesh), it is spread in a steel belt reduction furnace and decomposed ammonia for reduction annealing at 800~900℃. The annealed sintered powder block is hammered and broken to obtain high-quality sponge iron powder.

Pyron Process crushes the rolled steel scale of low-carbon boiling steel to less than 0.147mm, and then places it in a multi-hearth roasting furnace at 980°C to oxidize it to Fe2O3. Then the Fe2O3 powder is fed into the belt furnace, and the Fe2O3 powder is reduced to iron powder by passing hydrogen at a temperature not exceeding 1050℃.

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