| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely and economically recover an alloy which has reduced impurities, by melting an alloy scrap containing rare earth metals by charging into a melting furnace, recovering the solidified alloy from the lower part and gradually lowering and separating the impurities of oxides, etc., from the alloy. SOLUTION: It is desirable that a heating method in the melting furnace is to use any method among an arc melting, plasma melting, electron beam melting or electro slag melting and the alloy containing the rare earth metals is a magnet alloy, hydrogen storage alloy or super magnetostrictive alloy. The alloy scrap and fluoride of the rare earth element, fluoride of alkaline earth metal and/or fluoride of alkali metal, are mixedly melted, and it is desirable to contain the rare earth metal in which metal Ca is mixed in these fluorides. As for the alloy scrap containing the rare earth metal, concretely, Nd-Fe-B base alloy, La-Ni base alloy and Tb-Dy-Fe base alloy are exemplified.</p> |
