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Describe the underlying principle of each of the following metal refining methods : Vapour phase refining of metals. |
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Answer» Solution :This method is used for preparing ultrapure metals. In this method, the impure metal is first converted into a volatile stable compound (GENERALLY iodide) leaving behind the impurities. It is then decomposed at a higher temperature to give pure metal. Metals like titanium, thorium, URANIUM and ZIRCONIUM are purified. `{:(Ti+2I_(2)overset(500K)(to)TiI_(4)overset(1700K)(to)Ti+2I_(2)),(" Impure metal Volatile compound Pure metal "):}`. |
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