METHOD OF RECOVERING USEFUL MATERIALS FROM SCRAP OF RARE EARTH-IRON-BORON MAGNET

摘要

A method of recovering useful materials from a scrap of a rare earth-iron-boron magnet by which iron and boron can be recovered as ferroboron from the rare earth-iron-boron magnet scrap and the rare earth element can be efficiently recovered as an oxide. The recovery method comprises: a step in which the rare earth-iron-boron magnet scrap is oxidized in an oxygen-containing atmosphere; a step in which a mixture for thermit reaction comprising the oxidized magnet scrap and aluminum and/or an aluminum alloy is prepared; a step in which the mixture for thermit reaction is caused to undergo thermit reaction in order to yield ferroboron and a slag; and a step in which the ferroboron and slag obtained by the thermit reaction are separated.