EXTRACTION OF METALS FROM WASTES CONTAINING COPPER AND OTHER METALS OF VALUE Russian patent published in 2013 - IPC C22B7/04 C22B15/00 C22B23/00 C22B4/06 

FIELD: metallurgy.

SUBSTANCE: extraction of non-ferrous metals is performed in plasma electric arc furnace of alternating current, which has a group of electrodes and contains a molten liquid copper bath coated with liquid slag. The method involves a melting-reducing stage consisting of the following operations: loading of metallurgical wastes onto the surface of liquid molten copper bath, melting of metallurgical wastes in liquid slag at the slag/bath copper boundary, reduction at least of non-ferrous metals to the oxidation degree, which is more than or is equal to zero, and intensive mixing of the liquid molten copper bath by blowing of inert gas, preferably nitrogen and (or) argon. Mixing is performed so that it can be possible to avoid the formation of a crust, expedite the reduction reaction and cause the transition of copper-soluble non-ferrous metals to the molten copper.

EFFECT: increasing the extraction of non-ferrous metals from wastes.

16 cl, 9 tbl, 2 ex