| 简介 |
PROBLEM TO BE SOLVED : To provide a method for recovering a rare-earth element from a processing object at least including the rare-earth element and an iron group element, which can be put into practical use as a low-cost and simple recycling system.
SOLUTION : A method for recovering a rare-earth element includes at least a step of separating the rare-earth element as an oxide from an iron group element by subjecting a processing object having been oxidized to heat treatment at a temperature of 1, 200°C or above under the presence of boron nitride. While each of an oxide of the rare-earth element and the iron group element is directly melted without reacting with the boron nitride at high temperatures, an oxide of the iron group element is reduced to the iron element through a reaction with the boron nitride at high temperatures and melted. Accordingly, a molten product of the oxide of the rare-earth element and a molten product of the iron group element can be separated. The processing object having been oxidized is obtained by being subjected to at least one treatment selected from among heat treatment, combustion treatment and black oxidation treatment using alkali.
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