Abstract:Separation test of Hf by extraction with TBP from nitric acid dissolved Hf & Ti enriched slag was conducted. Effects of Hf & Ti mass concentration, initial acidity of organic phase, extraction time, initial acidity of water phase, and phase ratio of organic phase to aqueous (O/A) on separation of Hf and Ti were investigated. Washing tests with different concentration of nitric acid were carried out. Theory stage of fractional extraction was calculated based on data of extraction and washing. The results show that extraction rate of Hf and Ti is 84.8% and 5.1% respectively, distribution ratio of Hf and Ti is 5.6 and 0.054, and extraction separation coefficient βHf/Ti is 104 under the optimum conditions including total mass concentration of Hf & Ti of 2.8 g/L, initial acidity of organic phase of 3.1 mol/L, extraction time of 6 min, initial acidity of water phase of 6.5 mol/L, and O/A=1/1. Washing separation coefficient β""Hf/Ti of TBP organic phase loaded with Hf with 10 mol/L nitric acid is 105, which is basically consistent with βHf/Ti. Extraction stage is three and washing stage is four to separate Hf and Ti by fractionation extraction after calculation.