METHOD FOR THE CONTINUOUS OR DISCONTINUOUS EXTRACTION OF A METAL OR SEVERAL METALS FROM A SLAG THAT CONTAIN THE METAL OR A COMPOUND OF THE METAL

摘要

A B S T R A C T The invention concerns a method for the continuous orIf discontinuous extraction of a meta"l 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). To provide an improved method for extracting metals, especially copper, from slags, the invention provides that the metal-containing slag is heated in a primary or secondary smelting unit (1) designed as an alternating-current electric furnace, and the 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 (CaC2) , ferrosilicon (FeO), aluminum (Al), and/or reducing gases is added and/^or injected into the primary or secondary smelting unit (1).