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Converting Stainless Steel Furnace Flue Dusts and Wastes to a Recyclable Alloy.
Powell-HE; Dressel-WM; Crosby-RL
NTIS: PB 243 628 :24 pages
Over 5 million lb of chromium, 1 million lb of nickel, and 90,000 lb of molybdenum are lost annually in the dusts generated in the production of stainless steel. Additional losses of these metals in the form of mill scale and grinding swarf may be double the dust losses. This Bureau of Mines report describes a process for recovering these and other metals in the form of an alloy steel suitable for recycling. Zinc and lead, when present in the wastes, are recovered as byproducts in the form of oxide fumes. The laboratory-scale process (10- to 25-lb charges) recovers up to 95 pct of the chromium, 100 pct of the nickel, and 100 pct of the iron. The resultant alloy contains from 10 to 20 pct chromium, 6 to 12 pct nickel, and 55 to 65 pct iron, with lesser amounts of molybdenum and manganese. The alloy is essentially free of zinc, lead, and sulfur. The zinc-lead fume obtained from the treatment contains about 40 pct zinc and 20 pct lead and represents essentially complete recovery of these metals.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 243 628
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division