Our Rockwood facility was originally constructed in the 1970s by Amcon Corporation to produce iron pellets by direct iron reduction (DRI). This operation occurred from 1985 to 1987 by Norcarbon, a subsidiary of NORCEM (Norwegian Cement), and subsequently until 1989 by Reserve Carbon, Inc. to produce high purity carbon (silicon-carbon)
The facility was purchased in 1989 and produced silicon-carbon until 1990 and after converting and producing Waelz Oxide from EAF dust.
199 Truck Route, PO Box 5
Rockwood, TN 37854
What happens here?
At our recycling facilities, EAF dust is fed along with coke or coal into a Waelz kiln, which is a large, rotating metal tube. In the kiln the EAF dust is tumbled and heated to a temperature where certain non-ferrous metals are vaporized. Air is drawn through the kiln and the metal vapors are oxidized to form solid metal oxide particulates which, once collected, is WOX. Air from the kiln passes through a product collector where the WOX is gathered. WOX is a light gray metal oxide powder, that contains 60% zinc oxide. Other metal oxides recovered in WOX include lead oxides, cadmium oxides, and chromium oxides.
The remaining portion of EAF dust that exits the kiln is Iron-Rich Material, referred to as IRM. IRM contains 40% iron oxide and other minerals, and once tested to ensure hazardous metals have been removed, can be sold to asphalt, cement, or aggregate companies, and it can even go back into the steel production process.