摘要
试验研究多孔硅胶对高含氟溶液中UO_(2)^(2+)的静态和动态吸附行为,探索硅胶吸附除铀技术在高含氟放射性废水处理中应用的可行性,并验证各吸附条件的影响。当溶液中ρ(F^(-))达到100 g/L时,多孔硅胶对UO_(2)^(2+)的静态吸附容量(以干硅胶计)为31~33 mg/g,高含氟环境对多孔硅胶吸附UO_(2)^(2+)的影响较小,且多孔硅胶对UO_(2)^(2+)与F^(-)有较高的选择性。通过静态吸附试验可知,多孔硅胶在pH为8~9的环境中,对UO_(2)^(2+)的吸附效果最佳。动态吸附试验表明,当进料pH为9时,硅胶吸附柱的工作容量约为20倍柱体积。使用1 mol/L HNO_(3)解吸液可将吸附UO_(2)^(2+)硅胶柱中的部分UO_(2)^(2+)洗脱,解吸液容量约为10倍柱体积。硅胶柱用1 mol/L HNO_(3)解吸后复用5~6次,UO_(2)^(2+)的穿透曲线位置基本一致。
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.Whenρ(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 selectivity for UO_(2)^(2+) 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 HNO_(3),with a capacity of about 10 times the column volume.The porous silica gel column was desorbed with 1 mol/L HNO_(3) eluent and reused 5~6 times,with the basically same penetration curve position for uranium.
作者
欧阳毅
OUYANG Yi(No.272 Uranium Co.,Ltd.,CNNC,Hengyang 421002,China)
出处
《铀矿冶》
CAS
2024年第1期81-86,共6页
Uranium Mining and Metallurgy
