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Process for Reducing Molten Furnace Slags by Carbon Injection.
U S Pat 4 110 107 1978 Aug; :
Metals are recovered from slags obtained from copper-smelting furnaces or in smelting Ni-containing ores. The slag is fed into an electric-arc furnace in which a molten alloy bath is formed. An injection unit in a tube feeds carbon into the bottom of the bath. After reduction, the metal product (e.g., Fe-Cu, Fe-Ni base alloy) is tapped from the furnace. Chem. Abstr. 90:125,140K (see also chem. Abstr. 88:195,215W) recovery of metals from fe-cu and fe- ni slags consists of injecting carbon into the melt, adding flux such as cao as needed, and tapping after reduction. Thus, 1,000 lb of cu-fe slag and 600 lb fe scrap were melted and carbon was fed from the bottom of the furnace. After the initial reaction subsided, pebble cao was fed into the furnace. The process was terminated by removing the injector and casting 50 pigs. The recovery was fe 76 and cu 94 pct.
U.S. Pat. 4,110,107; Aug. 29, 1978; Chem. Abstr. 88:195,215W
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