The metal refined by Van Arkel method is

Zirconium (Zr) or Titanium (Ti) is refined using van Arkel method. This method is very useful for removing all the oxygen and nitrogen present in the form of impurity in metals like Zr and Ti.

van Arkel Method for Refining Zirconium or Titanium: This method is very useful for removing all the oxygen and nitrogen present in the form of impurity in certain metals like Zr and Ti. The crude metal is heated in an evacuated vessel with iodine. The metal iodide being more covalent, volatilises:
Zr + 2I₂ → ZrI₄ 
The metal iodide is decomposed on a tungsten filament, electrically heated to about 1800K. The pure metal is thus deposited on the
filament.
ZrI₄ → Zr + 2I₂