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Asked by Ritu Last Modified
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Method for refining metals such as germanium is Zone Refining method.
Principle: when an impure metal is heated & allowed to cool the pure metal will crystallize the impurities will remain in molten state.
Method: the impure metal is converted in rods. The rods are heated at one end with a circular rotar. A narrow zone of rod is heated. Then the rotar moves further in the rod. Each time heating a small zone. The pure part of the metal recrystallizes whereas the impure form remains in molten state which can be cut out. This process is repeated several times to get pure metal.
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