Pellets are uniform size, with purity of 63%- 65% contributing to faster reduction and high metallization rates. Pellets with their high, uniform mechanical strength and high abrasive strength increase production of sponge iron by 25% to 30% with same amount of fuel.
The process of pelletization enables converting Iron Ore Fines into “Uniformed Sized Iron Ore Pellets” that can be charged into the blast furnaces or for Production of Direct Reduced Iron (DRI).
Properties of Iron Ore Pellets :
- Cold crushing strength of pellets found to increase with increasing firing temperature.
- Decrease of mean particle size (MPS) does not have a relationship with the pellet strength, but it reduces the porosity of the pellet.
- Fluxed pellets exhibits good strength, improved reducibility, swelling and softening melting characteristics. Because of these properties these pellets give better performance in the blast furnace.
- Swelling indicates volume change of pellets during reduction. Higher swelling reduces the strength of the pellets after their reduction thereby resulting in high resistance to gas flow, burden hanging and slipping indiside the blast furnace. Maximum allowable swelling of pellets for the blast furnace ranges from 16 -18 %.
Acid pellets (DRI pellets) and MgO free pellets exhibit higher swelling at 0.6 basicity and decreased thereafter
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