| 摘要 |
<p>PURPOSE: To reproduce a higher purity of Al than Ti-containing Al by reacting carbon or carbide with molten Al containing Ti as impurity and separating Ti as the carbide from the molten Al. CONSTITUTION: Scrap, etc., of Al or Al alloy containing Ti as impurity is melted and powdery, granular, bar-like, platy or bulky carbon or carbide of SiC, B4 C, etc., is added at >=0.3wt.% in terms of C to the Ti quantity in the Al and brought into contact with the molten metal to make the Ti as the carbide or the Ti-containing composite carbide. In this case, the production of the Ti carbide or the Ti-containing composite carbide is promoted by holding the molten Al to the high temp. at 1200-1500 deg.C and also, pressurizing. Inert gas is blown in this molten Al, and after separating and floating up the Ti carbide or the Ti-containing composite carbide from the molten Al, the Ti carbide, etc., is filtered and separated through a fire-resistant filter. Alternatively, the Ti-containing molten Al is passed through carbon or carbide-filling filter and the Ti is separated and removed as the carbide, etc.</p> |
