Wang Runci, Yuan Zhongwei, Meng Xiang, Yan Taihong, Zheng Weifang
Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China.
Membranes (Basel). 2025 May 1;15(5):133. doi: 10.3390/membranes15050133.
A commercial polymeric nanofiltration membrane (NF270, DuPont) was employed for uranium removal from ammonium diuranate filtrate (ADUF). Carbonate supplementation through ammonium carbonate addition enhanced uranium rejection via formation of uranyl-carbonate coordination complexes. Systematic speciation analysis of uranium species in ADUF was conducted, coupled with calculation of the concentration polarization modulus to optimize ammonium carbonate dosage. The experimental results demonstrated that with 680 mg/L ammonium carbonate addition, the permeate uranium concentration decreased from 1.2 mg/L to 0.64 mg/L. This study confirms the technical feasibility of ADUF carbonation pretreatment for improving uranium retention efficiency in nanofiltration processes, achieving 46.7% reduction in uranium permeation flux.
采用一种商用聚合物纳滤膜（NF270，杜邦公司）从重铀酸铵滤液（ADUF）中去除铀。通过添加碳酸铵补充碳酸盐，通过形成铀酰 - 碳酸盐配位络合物提高了铀截留率。对ADUF中的铀物种进行了系统的形态分析，并结合浓度极化模量的计算来优化碳酸铵用量。实验结果表明，添加680 mg/L碳酸铵后，渗透液中的铀浓度从1.2 mg/L降至0.64 mg/L。本研究证实了ADUF碳酸化预处理在提高纳滤过程中铀保留效率方面的技术可行性，实现了铀渗透通量降低46.7%。
