Patent ID: 8157884
Filing Date: 2012-04-17
Classification: C21D,C22B,F27B,F27D,Y02P

Abstract:
1. A method for the continuous or discontinuous extraction of a metal or several metals from a slag that contains the metal or a compound of the metal, in which the liquefied metal-containing slag is heated in a primary or secondary smelting unit ( 1 ) designed as an alternating-current electric furnace, and molten material is then fed from the primary or secondary smelting unit ( 1 ) into a furnace ( 2 ) designed as a direct-current electric furnace, in which the metal to be extracted is subjected to an electrolytic separation, where a reducing agent in the form of calcium silicide (CaSi), calcium carbide (CaC 2 ), ferrosilicon (FeSi), aluminum (Al), and/or reducing gases is added and/or injected into the primary or secondary smelting unit ( 1 ) wherein, in the second furnace ( 2 ), which is designed as a direct-current electric furnace, the molten bath is electromagnetically stirred during the recovery of the metal.