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)