A successful experimental method for recovering scarce and expensive alloying elements from electric-arc furnace flue dusts and stainless steel wastes has been developed at the Bureau of Mines Rolla Metallurgy Research Center at Rolla, Missouri. The laboratory-scale process recovers nearly all of the chromium, nickel, and iron contained in such materials as flue dust, mill scale, and grinding "swarf." The procedure involves pelletizing waste products, reducing them in a carbon-lined induction furnace, and casting the molten metal as an alloy containing 10 to 20 percent chromium, 6 to 12 percent nickel, and 55 to 65 percent iron, plus lesser amounts of molybdenum and manganese. The alloy is essentially free of zinc, lead, and sulfur, which are driven off as oxide fumes.
33 Mag., V. 13, No. 4, April 1975, PP. 48-50