摘要
以KH_(2)PO_(4)、重烧MgO、硼砂、硅灰等为原料,20~1000℃下制备磷酸盐水合陶瓷并固化模拟放射性含氟浓缩液,研究固化体的物相组成、微观形貌、力学性能、孔隙率和元素浸出等。结果表明:随着温度升高,固化体内部最初的结构发生坍塌,抗压强度降低、孔隙率增大;温度达到800℃后,磷酸盐水合陶瓷固化体生成新矿相Mg_(7)F_(2)(SiO_(4))_(3)、Mg_(2)SiO_(4)、Mg_(3)B_(2)O_(6)等,组成了光滑致密的网络框架,抗压强度回升,孔隙率降低;生成的陶瓷矿相有助于增加元素滞留能力,对Cs主要是物理阻碍作用,对F主要是化学作用。
In this paper,phosphate hydrated ceramic waste form was prepared by simulating the radioactive fluorine-containing concentrated liquid with KH_(2)PO_(4),dead burned magnesium oxide,borax and silica fume at 20-1000℃.The phase composition,microstructure,mechanical properties,porosity and element leaching of the solidified body obtained at different temperatures were studied.The results show that with the increase of temperature,the initial structure of the solidified body collapses,the compressive strength decreases and the porosity increases.When the temperature reaches 800℃,some new ore phases of Mg_(7)F_(2)(SiO_(4))_(3),Mg_(2)SiO_(4) and Mg_(3)B_(2)O_(6) are generated.The smooth and dense network frame contribute to an increasing of the compressive strength and a decreasing of the porosity.The generated ceramic mineralization contributes to the increase of element retention capacity,which is considered that it is a physical effect on Cs and a chemical effect on F.
作者
余博文
钱正华
周顺
李霖
乔延波
严雅
全葳
YU Bo-wen;QIAN Zheng-hua;ZHOU Shun;LI Lin;QIAO Yan-bo;YAN Ya;QUAN Wei(School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;Nuclear and Radiation Safety Center,Ministry of Ecology and Environment,Beijing 100082,China)
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2021年第5期411-417,I0004,共8页
Journal of Nuclear and Radiochemistry
基金
中国科学院上海应用物理研究所育新计划项目(Y955031031)
上海市扬帆计划资助项目(19YF1458100)。
关键词
放射性含氟浓缩液
磷酸盐水合陶瓷
温度
矿相
元素浸出
radioactive fluorine-containing concentrated liquid
phosphate hydrated ceramics
temperature
ore phase
element leaching