Process for improving purity of metal hafnium

The invention relates to the technical field of metal hafnium preparation, and particularly discloses a process for improving the purity of metal hafnium, which comprises the following steps: (1) putting a metal hafnium raw material in a vacuum heating furnace with an electrolytic anode and an electrolytic cathode; and then adding a deoxidant formed by metal aluminum and cryolite into a vacuum heating furnace until the metal hafnium raw material is completely covered, and inserting the electrolytic anode and the electrolytic cathode into the deoxidant. And (2) the upper end opening of the vacuum heating furnace is sealed through a sealing cover, a metal aluminum block is arranged in the upper end opening, and a neodymium magnet is arranged above the sealing cover. And then vacuumizing the vacuum heating furnace. And (3) starting the vacuum heating furnace to heat and preserve heat of the metal hafnium raw material and the deoxidant, and starting the electrolytic anode and the electrolytic cathode for electrol