| 摘要 |
<p>The invention concerns the method for reprocessing of aluminium slag. Novelty of the method is that the reprocessing of the aluminium slag is performed in electro-slag furnace with the crucible with the bottom electrode as a cathode and the top electrode as an anode. The melting and dissolution of the slag occur at the temperature in the range of 800-2000 °C. The cryolite (Na3AlF6) and the alumina (Al2O3) are loaded into the crucible of electro-slag furnace and melted, then into the obtained liquid melt (electrolyte) the crushed aluminium slag (mechanical mixture of Al2O3 and aluminium metal) and the cryolite are charged by portions with melting and dissolution thereof in the electrolyte. The extraction of liquid metal aluminium occurs on the bottom of the crucible, in the area of cathode, and the extraction of secondary slag as mixture of cryolite and alumina occurs in the area of the anode, after which the discharge of the metal and the secondary slag is carried out. Method allows almost complete separation of metallic fraction and oxide fraction of the aluminium slag, the extraction of metal being up to 99%. The received metal aluminium and/or aluminium alloy can be used for the production of aluminium alloys, and the received secondary slag in form of mixture of cryolite and alumina is usable as a raw material for production of primary aluminium by electrolysis.</p> |
