|発明の名称||METHOD FOR SEPARATING AND REFINING RARE METAL BY CHLORINATION VOLATILIZATION METHOD|
PROBLEM TO BE SOLVED: To provide a method for separating and refining rare metals by a chlorination volatilization method which provides a process in which a separation efficiency higher than a conventional process can be attained by combining addition of a calcium compound and solid carbon and a heat treatment.
SOLUTION: The method for separating and refining rare metals includes: a first process being a heat treatment process comprising adding a calcium compound to a raw material and heat treating the resulting mixture in an inert atmosphere; a second process being a chlorination volatilization treatment process for producing high-concentration solid compounds of tantalum, chromium, and titanium by heating the calcium-treated sample in a chlorine gas stream to volatilize and separate tungsten, niobium, nickel, and cobalt; a third process being a chlorination volatilization treatment process for volatilizing and separating tantalum, chromium, titanium or the like, being contained rare metals, by mixing the high-concentration solid compounds with solid carbon and heating the resulting mixture in a chlorine atmosphere; and a fourth process being a separation and concentration process for performing simple body separation of each element by depositing the metal chlorides separated from a raw material powder or the high-concentration solid compounds by adjusting the temperature of a cooling zone.
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