The RHF Concept
The hearth is essentially a large turntable that rotates within a toroidal enclosure. The feed pellets (composite agglomerates made from iron oxide fines and a carbon source such as coal, charcoal, or other carbon-bearing materials) are charged to the hearth, one to two layers deep, and as they move on the hearth, are heated by burners firing above the hearth and combustion of gases liberated from the pellets. One revolution of the hearth takes approximately ten minutes.
MIDREX® Rotary Hearth Furnace (RHF) Details
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In FASTMET®, the product is direct reduced iron, but in ITmk3®, the pellets are melted in the last zone of the hearth to produce a premium quality pig iron product with a slag by-product.
ITmk3® evolved from the FASTMET® Process, developed by Midrex Technologies and Kobe Steel, Midrex’s parent company.
