Abstract
The rare earth magnet has a good performance, and the production is increasing year by year. Two types of rare earth magnets are presently made as industrial products. One is a Nd-Fe-B intermetallic compound magnet and the other is a Sm-Coalloy magnet.The mixed scraps of Nd-Fe-B intermetallic compound and Sm-Co alloy are sometimes produced in the step of production, and the magnets are discarded owing to the deterioration of them and the products equipped with them and they are consequently expected to collect as the mixed scraps of them in the future.In the present study, acid leaching of the oxidizing roasted products of Nd-Fe-B intermetallic compound and Sm-Co alloy is tested to obtain the fundamental data for the treatment of the mixed rare earth magnet scraps. The results obtained in this study are summarized as follows:The leaching rate of Nd from the oxidizing roasted product of Nd-Fe-B intermetallic compound with hydrochloricacid and the leaching rates of Sm, Co and Fe from the oxidizing roasted product of Sm-Co alloy with hydrochloric acid and sulfuric acid are represented by the volume reaction model.The activation energy of these leaching reactions are over 41kj·mol-1 and the extraction of these metals are not affected by the stirring speeds, therefore it is considered that these leaching reactions are chemically controlled.
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