Study on the adsorption distribution coefficient of zirconium and hafnium by anion ion exchange resin

Through the static experiment method, the experiment on measurement the value of K_d(Zr)/K_d(Hf) with 201 × 7, D290, D296 ion exchange resin in zirconium(Hf) sulfate solution was carried out. The experiment results show that value of K_d(Zr)/K_d(Hf) of D296 macroporous anion exchange resin is larger than that of the D290 resin adsorption, and is the best of the three resins, because different pore structure of ion exchange resins has the more significant influence on two-phase distribution ratio of Zr and Hf. The paper further studies the effects of sulphuric acid and the solution temperature on the K_d(Zr) and K_d(Hf) influence as well as D290 porous anion exchange resin adsorption value of K_d(Zr)/K_d(Hf) influence. The results indicate that the value of K_d(Zr)/K_d(Hf) of D296 is the best when the temperature of is 1∼3 ℃ and the c(H₂S0₄) sulfuric acid is 1.6 mol/L of Zirconium(Hf) sulfate solution. And by the experimental results infer that the value of K_d(Hf) by D290 porous anion exchange resin adsorption value is controlled smaller in Hf sulfate solution, therefore, the value of K_d(Zr)/K_d(Hf) reaches the maximum. As the results, the value is benefit to the late separation process. Therefore, nuclear grade zirconium and nuclear grade hafnium can be obtained through the further development of elution experiments. (authors)