A method and system for improved ion exchange chromatographic elemental separations of zirconium and hafnium elements and also, if desired, separations of the isotopes thereof from crude zirconium minerals by using improved crude aqueous zirconium (also containing hafnium) chloride feedstock...http://www.google.com.au/patents/US5762890?utm_source=gb-gplus-sharePatent US5762890 - Zirconium and hafnium separation in chloride solutions using continuous ion exchange chromatography 
