Patent ID: 7674441
Filing Date: 2010-03-09
Classification: C22B,Y02P

Abstract:
1. A method of manufacturing high purity hafnium, comprising the steps of: making an aqueous solution of a chloride of hafnium removing zirconium from the aqueous solution via organic solvent extraction, performing chlorination to the hafnium oxide to obtain hafnium chloride, reducing said hafnium chloride to obtain a hafnium sponge, a moisture content in the hafnium chloride before said reducing step and in the atmosphere being 0.1 wt % or less and a nitrogen content therein being 0.1 wt % or less, a reduction atmosphere used in said reducing step being an argon atmosphere, and said reducing step being performed under a positive pressure of 1 atmospheric pressure or greater, and subjecting the hafnium sponge to electron beam melting to obtain a hafnium ingot.