Recovery of Se, Zr, Pd, and Cs from simulated high-level radioactive waste glass through phase separation
Recovery of Se, Zr, Pd, and Cs from simulated high-level radioactive waste glass through phase separation
复制标题
通过相分离从模拟高放射性废玻璃中回收 Se、Zr、Pd 和 Cs
DOI：
10.1111/ijag.16600
复制
发表时间：
2022
影响因子：
2.1
通讯作者：
A. Masuno
中科院分区：
文献类型：
--
作者：
H. Inoue;Y. Watanabe;J. Chung;K. Kizaki;A. Masuno
在本研究中，采用相分离法从模拟高放废物（HLW）玻璃中进行元素回收。为了实现相分离，在模拟高分子量玻璃中加入SiO2和B2O3，并将SiO2: B2O3与其他氧化物的比例调整为40:50:10。将相分离玻璃在0-3 mol/L的HNO3、H2SO4和1:1的hcl - HNO3水溶液中浸泡20 h，观察17种元素的溶解行为。各元素的溶解质量分数与浸液中酸浓度之间的关系可以用修正的s型函数近似表示。采用四阶段浸出工艺，将样品依次浸在蒸馏水、HNO3、H2SO4和1:1的hcl - HNO3的水溶液中，浸出20小时，测试了稳定核Se、Zr、Pd和Cs的回收率，而不是长寿命的放射性核。此外，还可以根据上述单个溶出结果预测回收率。
In this study, elemental recovery was performed using phase separation from simulated high‐level radioactive waste (HLW) glass. To cause phase separation, SiO2and B2O3were added to the simulated HLW glass and adjusted the ratio of SiO2: B2O3: other oxides to 40:50:10. The phase separated glass was immersed in aqueous solutions of 0–3 mol/L of HNO3, H2SO4, and a 1:1 mixture of HCl–HNO3at 363 K for 20 h, and the dissolution behavior of 17 elements was examined. The relationship between the dissolved mass fraction of each element and the acid concentration in the immersion liquid could be approximated by the modified sigmoid function. The recovery of stable nuclei Se, Zr, Pd, and Cs instead of long‐lived radioactive nuclei was tested using a four‐stage leaching process in which the sample was immersed sequentially in four aqueous solutions at 363 K of distilled water, HNO3, H2SO4, and a 1:1 mixture of HCl–HNO3for 20 h. It was confirmed that Se, Zr, Pd, and Cs could be recovered selectively. Furthermore, the recovery result could be predicted based on the individual dissolution results described above.