水杨酸螯合树脂对铀的吸附性能  

Adsorption Performance of Salicylic Acid Chelating Resin for Uranium

作　　者：王凤菊[1] 陈树森[1] 宋艳[1] 李子明 吴浩天 李昊 李壑 WANG Fengju;CHEN Shusen;SONG Yan;LI Ziming;WU Haotian;LI Hao;LI He(Beijing Research Institute of Chemical Engineering and Metallurgy,CNNC,Beijing 101149,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《铀矿冶》2024年第3期40-44,共5页Uranium Mining and Metallurgy

摘　　要：利用低温氮气吸附—脱附法测定水杨酸螯合树脂的比表面积、孔径;考察了水杨酸螯合树脂的热力学稳定性;研究了溶液pH、ρ(Cl^(-))对水杨酸螯合树脂铀吸附性能的影响,以及树脂的吸附等温线、吸附动力学及解吸性能。结果表明:水杨酸螯合树脂的比表面积为32.34 m^(2)/g,孔径为32.08 nm,当温度低于180℃时,水杨酸螯合树脂具有良好的热稳定性;在pH为7~9时,树脂吸附性能较好,铀吸附量达14.1 mg/g(以干树脂计,下同);Cl^(-)的存在会降低树脂对铀的吸附量,当ρ(Cl^(-))为3.0 g/L时,铀吸附量降低约9.9%;当铀溶液的平衡浓度为400 mg/L时,树脂的铀吸附量达到最大,为153 mg/g;吸附20 h,吸附过程达到平衡。酸性解吸剂与碱性解吸剂对树脂均具有良好的解吸性能,解吸率均在94%以上。在ρ(U)=21.2 mg/L、ρ(Cl^(-))=3.36 g/L的真实铀浸出液中吸附24 h,水杨酸螯合树脂的铀吸附量达14.7 mg/g,具有较好的铀吸附性能。For the salicylic acid chelating resin,the specific surface area and pore size were determined using low temperature nitrogen adsorption-desorption method;and its thermodynamic stability was examined.The effects of solution pH andρ(Cl^(-))on its uranium adsorption performance were studied,and its adsorption isotherms,adsorption kinetics,and desorption performance were also investigated.The results show that the specific surface area of salicylic acid chelating resin is 32.34 m 2/g,and the pore size is 32.08 nm,The salicylic acid chelated resin has good thermal stability when the temperature is below 180℃.When the pH is in the range of 7~9,the resin has good adsorption performance,and the uranium adsorption capacity can reach 14.1 mg/g dry resin.The presence of Cl^(-)can reduce the adsorption capacity for uranium.When theρ(Cl^(-))is 3.0 g/L,the uranium adsorption capacity decrease by about 9.2%.When the equilibriumρ(U)in solution is 400 mg/L,the uranium adsorption capacity of the resin reach its maximum,at 153 mg/g dry resin.After 20 h adsorption,the adsorption process reach equilibrium.Both acidic and alkaline desorption agents show good desorption performance for resins,with desorption rates both above 94%.For the real uranium leaching solution withρ(U)of 21.2 mg/L andρ(Cl^(-))of 3.36 g/L,the uranium adsorption capacity of the salicylic acid chelating resin can reach 14.7 mg/g dry resin after 24 h adsorption,indicating good uranium adsorption performance.

关 键 词：水杨酸 螯合 树脂 铀 吸附 浸出液 

分 类 号：TL212.3[核科学技术—核燃料循环与材料]