Which following method is used for refining of impure zirconium?

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, $\mathrm{Zr}$ (impure) $+2 \mathrm{l}_{2} \rightarrow \mathrm{Zrl}_{4}$ $\mathrm{Zrl}_{4} \rightarrow \mathrm{Zr}$ (pure) $+2 \mathrm{I}_{2}$ (at 1800K) For Titanium, Ti(impure) $+2 \mathrm{I}_{2} \rightarrow \mathrm{Til}_{4}$ $\mathrm{Til}_{4} \rightarrow \mathrm{Ti}($ pure $)+2 \mathrm{I}_{2}($ at $1800 \mathrm{~K})$