Patent ID: 6096110
Filing Date: 2000-08-01
Classification: C22B,Y02P

Abstract:
In a method for cleaning slag created in a metallurgical process of a non-ferrous metal, in which the slag, fed into an electric furnace, forms by means of a reductant, a reduced slag layer and a matte layer beneath the slag layer, said electric furnace being equipped with a slag feed inlet at maximum melt level, a slag tapping hole at the bottom part of the slag layer for the reduced slag and a matte tapping hole, the improvement which comprisesfeeding slag into an electric furnace equipped with two slag tapping holes at different heights, filling the furnace to its maximum melt level while the lower slag tapping hole at the bottom part of the slag layer is closed, permitting flow of reduced slag out and through an upper slag tapping hole, stopping said flow of the reduced slag from the upper slag tapping hole, stopping the feed of slag into the furnace, and tapping said slag through said lower tapping hole.