Pelletization plant

Specifications

Iron ore pellets are being increasingly favored in modern blast furnaces. The proportion of pellets in the burden for iron making is increasing due to properties such as good intensity, uniform granularity, high grade iron, fine reducibility, etc. Quality of pellet is uniform and suited for transportation over long distances. Pellet is a good raw material for Sponge iron making too.

1.   Traveling grate pelletizing process

Characteristics:

• The main processes of drying, pre-heating, induration and cooling, are all included in one unit
• Suitable for large-capacity production..
• Highly adaptable to raw material. Hematite, magnetite or mix can be used as feed material. Compared to grate-kiln, it is better suited to hematite.
• Reliable equipment.
• Fuel: Furnace oil or coal gas/LPG

1 Hopper for side and hearth layer material; 2 Roller distributor; 3 Traveling grate; 4 Fan; 5 Primary air main; 6 Recuperation fan; 7 Primary air hood; 8 Furnace oil combustion chamber; 9 Blast drying air hood; 10 Downdraught drying air hood; 11 Preheated roasting hood 12 Soaking air hood; 13 Primary air hood; 14 Secondary air hood; 15 Pellet hopper; 16 Vibrating screen; 17. Wind box; 18.Chimney; 19 Waste air fan; 20 Recirculation fan; 21Cooling fan;

2. Traveling grate-Rotary Kiln (Grate-Kiln) pelletizing process

- Characteristic:

• Good adaptability to raw materials: both magnetite or hematite concentrate fines can be used;
• Good adaptability to different fuels like Pulverized coal, BF gas, mixed gas of BF/coke oven gas and converter gas.
• Low power consumption and utilization of secondary energy; 

Scale of Design

SSIT can design and supply pellet plant with capacity of 0.3 MT/A,

0.6 MT/A, 1 MT/A, 1.2 MT/A and 2 MT/A,

- Sketch of 0.3 MTPA Grate-kiln palletizing process

Process Description

The process starts at the raw feed storage and goes through a proportioning building, a concentrates drier, damp mill, balling disc  and finally through the Screening & Distribution System. The green ball is then conveyed to the traveling grate. After Drying and pre-heating on the grate, the green balls are discharged into the rotary kiln through a scraper and feeding chute. During the 30 35 minutes retention in the kiln, chemical reactions are completed on the pellets with physical changes resulting in a strength of 2200N/pellet (minimum). Then the hot pellet at approx. 1250 deg C is discharged from the rotary kiln and fed into a circular cooler.