| 简介 |
PROBLEM TO BE SOLVED : To provide a method that can be put into practical use as a simple recycle system at a low cost and is capable of separating and collecting a rare earth element from an iron group element and boron in an object to be treated including at least a rare earth element, an iron group element and boron.
SOLUTION : The rare earth element collection method includes at least the step of obtaining a collected material having a rare earth element content of 70 mass% or more and both iron group element content and boron content of 2.0 mass% or less by oxidizing an object to be treated and then moving its treatment environment into the presence of carbon and heating the object at a temperature of 1550-1800°C.
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