Patent ID: 6010553
Filing Date: 2000-01-04
Classification: C04B,C21B,C22B,Y02P,Y02W,Y10S

Abstract:
A process for producing pig iron, nonferrous heavy metal alloys, ferrochromium carbure or carbon-free ferrochromium and synthetic blast furnace slags, using metal-oxide-containing waste incineration residues or slags, said process comprising:(a) reducing charging materials comprising metal-oxide-containing waste incineration residues or metal-oxide-containing slags and separating nonferrous metals and/or alloys from the charging materials to form a slag phase which is depleted from the nonferrous metals and/or alloys;(b) mixing the slag phase with liquid steelworks slag containing chromium oxides, and optionally further mixing the slag phase with metallurgical dusts and LD slag, to form a crude-steel-containing slag comprising a crude steel portion;(c) removing the crude steel portion from the crude-steel-containing slag to thereby provide a remaining slag portion having a lower viscosity than the slag phase;(d) reducing the remaining slag portion to provide pig iron and synthetic blast furnace slag, and recovering the pig iron; and(e) discharging the synthetic blast furnace slag.