Saturday, August 11, 2012

VAN ARKEL Method

Ultra pure metals are being prepared by the 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.

19 comments:

  1. Why metals used in space tech should be pure sr? And why only van arkel method? Why not any other method?

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    Replies
    1. nahi pata bhai..

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    2. They aren't pure, rather they are made pure.As for why only Van Arkel method? Well, try Kroll process... :P

      ~JS

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    3. Van Arkel method gives the purest form of titanium.krolls process only gives impure titanium.

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  2. why we should convert impurities metal into titanium tetra-iodide?

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    1. Because titanium tetra iodide is volatile, and so the oxygen and nitrogen impurities are also removed along with it, and on decomposition at higher temperature, we get back pure Ti

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  3. What about Zirconium?

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    Replies
    1. Yes, Van Arkels method is also used to purify Zr.

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  4. van arkel method is used to purify Ti, Zr Hf and B

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  5. Why we use tungsten or tantalum failament for heating metal iodide??

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  6. Why we use tungsten or tantalum failament for heating metal iodide??

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  7. Because pure titanium has high strength and durability also it is a streagic metal I.e. Use to make arms (weapons) so pure titanium along with some amount of carbon used in making spacecraft rocket parts .

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  8. What is the best method for refining zinc??
    A)van arKel,b)zone refining,c)poling

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  9. Can Nickel be purified by van-arkel method?

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    Replies
    1. Mond process is used

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  10. what is the principle behind Van Arkel process

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