Absorbing Uranium From Radioactive Wastewater With High Fluoride by Porous Silica Gel
The static and dynamic adsorption behavior of porous silica gel on uranium in high fluoride solution was studied,the feasibility of the application of silica gel adsorption and uranium removal technology in the treatment of high fluoride radioactive wastewater was explored,and the influence of various adsorption conditions was verified.When ρ(F-)in the solution reaches 100 g/L,the static adsorption capacity of porous silica gel for uranium is 31～33 mg/g,indicating that the high fluoride environment has a small impact on the adsorption of uranium by porous silica gel and has a high selec-tivity for UO22+ and F-.The static adsorption test shows that the best adsorption effect for uranium is achieved when the radioactive wastewater pH= 8～9.The dynamic adsorption test shows that when the pH of radioactive wastewater is 9,the working capacity of the porous silica gel adsorption column is about 20 times the column volume.Most of the uranium in the adsorbed silica gel column can be desorbed by 1 mol/L HNO3,with a capacity of about 10 times the column volume.The porous silica gel column was desorbed with 1 mol/L HNO3 eluent and reused 5～6 times,with the basically same penetration curve position for uranium.
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