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this method is based on the fractional crystallization. when an impure metal is melting and allowed to solidify it will prefer to be in the molten region that is the impure metal is more soluble in the melt than in the solid state metal. the impure metal is taken in the form of a rod. one end of the rod is heated using a mobile induction heater and results in melting of the metal in that portion of the rod. when the heater slowly moves to the other end pure metal crystallizes and the impure metals moves to the adjacent molten zone formed due to movement of the heater. as the heater moves further away the molten region containing the impurities also moves along with it. this method is repeated several times by moving the heater in to same direction again and again to achieve the desired impurity level. it is carried out in an inert atmosphere to prevent the oxidation of metal. compounds like germanium, silicon, gallium used as conductors are refined using this method.
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