Steelworks dust -- From waste to product
- Lurgi Metallurgie GmbH, Frankfurt (Germany)
- Lurgi Corp., Charlotte, NC (United States)
Scrap-borne zinc and lead are enriched in the electric arc furnace dusts. Its Pb/Zn content of over 20% renders the dumping of this dust impossible in many countries, for both statutory and financial reasons. The Waelz process is the only reliable large-scale method for processing such dusts. 45% of the total electric furnace dusts occurring throughout Europe are being processed in Waelz plants with several operating in the US. The dust is treated in a rotary kiln where it is heated to approximately 1,200 C. Lead and zinc are volatilized under reducing conditions and collected as fine dust from the off-gas by cooling. The Waelz oxide recovered in the off-gas filters contains approximately 55% Zn and up to 10% Pb, and is ideal feedstock for the Imperial Smelting furnace for lead/zinc recovery. The remaining slag is inert and unleachable so that it can be used as a building aggregate.
- OSTI ID:
- 118856
- Report Number(s):
- CONF-9509197-; ISSN 0021-1559; TRN: IM9546%%257
- Journal Information:
- Iron and Steel Engineer, Vol. 72, Issue 7; Conference: 1995 Association of Iron and Steel Engineers (AISE) annual convention, Pittsburgh, PA (United States), 25-28 Sep 1995; Other Information: PBD: Jul 1995
- Country of Publication:
- United States
- Language:
- English
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