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Product Detail
Pelletizing grate kiln
Detail

The pellets production include four stages: raw materials preparation, formation of green balls or pellets, induration of the pellets, cooling, storage and transportation of pellets.

In the Grate-Kiln process the traveling grate is used to dry and preheat the pellets. Material moves on straight travelling grate till it attains the temperature of 800°C to 1000°C. Thereafter it is transferred to refractory lined rotary kiln for induration where the temperature is further raised up-to 1250 – 1300°C. At 800°C, the Magnetite iron Ore gets converted into Fe2O3 in an exothermic reaction. The liberated heat hardens the green balls which is helpful to withstand the tumbling impact in the rotary kiln. A circular cooler is used for cooling of the fired pellets.

Advantages of Pellets

1. Iron ore pellet is a kind of agglomerated fines which has better tumbling index when compared with the iron ore and it can be used as a substitute for the same both in the blast furnace and for DR production.

2. Pellets have good reducibility since they have high porosity (25-30%). Normally pellets are reduced considerably faster than sinter as well as iron ore lumps. High porosity also helps in better metallization in DRI production.

Pellets have a uniform size range generally within a range of 8 -16 mm.

Pellets have spherical shape and open pores which give them good bed permeability.

Pellets have low angle of repose which is a drawback for pellet since it creates uneven binder distribution.

The chemical analysis is uniform since it gets controlled during the beneficiation process. Fe content range from 63% to 68% depending on the Fe content of Ore fines. Absence of LOI is another advantage of the pellets.

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