Name the method used for the refining of Zr.

Vapor phase refining- This method is based upon the principle that the impure metal is converted into a suitable volatile compound which on being heated, gets decomposed to give pure metal. Among its examples, we can observe

(i) Mond process (also called carbonyl process)

(ii) van-Arkel de-Boer’s process (also called iodine refining process).

The Mond’s process is used for the purification of Nickel.

The van-Arkel de-Boer’s process is used for the purification of Zr (zirconium), Ti (titanium), V (vanadium), Th (thorium), etc.