Abstract
In 2001, the Minntac Division of US-Steel retrofitted one of their grate-kiln iron ore pelletizing lines with a ported-kiln air-injection system (PKAIS), the first of its kind in the world for oxide pellets. The ported kiln system injects air under the bed of pellets in the rotary kiln, causing rapid oxidation of the magnetite pellets. This rapid oxidation allows for lower kiln temperatures, which reduces fuel demand; allows for less heat load on the annular cooler; and produces higher pellet quality. Both the process and the equipment are patented developments by Metso Minerals. This paper discusses the process, the key equipment and the benefits to both the pellet plant and the downstream blast furnace operations.
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