explain van arkel method of refining
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Van Arkel Method. Crude metal is heated with a suitable substance so that the pure metal present in it may be converted into stable volatile compound leaving behind impurities. The compound so formed is then decomposed by heating to get the pure metal. Van Arkels method is used to purify crude titanium metal. It is heated with iodine to about 500K to form volatile compound. Til4 leaving behind the impurities .Til4 is further heated to 1700K when it decomposes to give pure titanium.
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Van Arkel Method. Crude metal is heated with a suitable substance so that the pure metal present in it may be converted into stable volatile compound leaving behind impurities. The compound so formed is then decomposed by heating to get the pure metal. Van Arkels method is used to purify crude titanium metal. It is heated with iodine to about 500K to form volatile compound. Til4 leaving behind the impurities .Til4 is further heated to 1700K when it decomposes to give pure titanium.
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In this method oxygen and nitrogen, present as impurity are removed by heating metal in an evacuated vessel with iodine. Van Arkel method is used for refining Zirconium or Titanium.The metal iodide volatize and it is decomposed on a tungsten filament, heated to about 1800K. The pure metal is deposited on the filament.
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