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Rotary kilns

Rotary kilns

Grate-Kiln iron ore pelletizing system provides process flexibility

The final induration is accomplished in a rotary kiln, wherein the principal heat transfer mechanism is radiation from the system's main burner.
Features
Benefits
Pelletization process
Pelletization process

Because the induration of the pellets occur in the rotary kiln, the pellets produced in a Grate-KilnTM system are consistently of higher quality than those produced in a straight grate.
The rotary kiln provides constant mixing of the pellets, bringing all the pellets to the same temperature. In a straight grate, the pellets at the top of the bed are “over cooked” and those at the bottom are “under cooked”. Higher quality means fewer fines, better reducibility and less variation in compression strength.

Ported kiln operation

By injecting air under the bed of pellets in the rotary kiln, complete oxidation can occur in magnetite pellets prior to the annualar cooler. This patented development by Metso Outotec, in addition to lowering fuel consumption, significantly improves pellet quality. Full oxidation at induration temperatures produces stronger pellets, while maintaining reducibility. This capability is unique to the Grate-Kiln system.

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