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Which method is used for refining Zr

Question:

Which method is used for refining Zr and Ti? Explain with the equation.

Solution:

Van Arkel method is used for refining Zr and Ti. Van Arkel process involves heating the impure metal with Iodine. It forms a volatile complex which on decomposition at high temperatures, gives back the metal but in very pure form.

Refining of Zr and Ti using Van Arkel method

For Zirconium,

Zr(impure) + 2I2→ ZrI4

ZrI4→Zr(pure) + 2I2 (at 1800K)

For Titanium,

Ti(impure) + 2I2→ TiI4

TiI4 → Ti(pure) + 2I2 (at 1800K)

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