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The extraction chromatography behavior of zirconium and hafnium is studied using tri- n -octylamine (TNOA) and tri-caprylyl-monomethyl ammonium chloride (Aliquat 336) as the stationary phase supported on a styrene/divinylbenzene copolymer resin and hydrochloric acid as the mobile phase. The effects of hydrochloric acid concentration, extractant loading on the support, support particle size, column dimensions, and hydrofluoric acid are investigated. Microgram amounts of Zr and Hf are successfully separated on a small size (Ø5 × 45 mm) column, on which Zr is adsorbed and Hf is completely eluted with 8M HCl. The adsorbed Zr is then eluted with 2M HCl. Aliquat 336 is found to be superior to TNOA for the mutual separation of Zr and Hf. The stability of the extraction chromatography resin is also examined.

Separation of Hafnium from Zirconium by Extraction Chromatography with Liquid Anionic Exchangers