摘要
铂系金属在玻璃熔体中的析出行为一直是高放废液(HLLW)玻璃固化技术领域的研究重点。本文围绕不同RuO_(2)和PdO的质量比(Ru/Pd)、熔融时间和熔融温度对玻璃熔体中的铂系金属析出物物相及形貌的影响进行了研究,XRD和SEM-EDS等测试结果表明:具有不同Ru/Pd的样品主要析出颗粒状RuO_(2)和球状Pd单质的团聚体,降低Ru/Pd或延长熔融时间均促进Pd球平均直径的增大,部分Pd单质由球状转变为不规则状,并呈RuO_(2)包覆Pd单质的特殊结构。熔融温度升高促进PdO还原分解,在1 000℃及以上熔融温度下,玻璃熔体中铂系金属主要以RuO_(2)和Pd单质形态存在。
The precipitation behaviour of platinum group metals in glass melts remains a key research focus within high-level liquid waste(HLLW)vitrification technology.The present study investigated the effects of varying mass ratio of RuO_(2) and PdO(Ru/Pd),melting durations,and melting temperatures on the precipitation phases and morphologies of platinum group metals in glass melts.Test results from XRD and SEM-EDS indicate that samples with different Ru/Pd primarily form aggregates of granular RuO_(2) and spherical Pd metal.A decrease in the Ru/Pd,or a prolongation of the melting duration,has been shown to increase the average diameter of Pd spheres.Furthermore,it is observed that the transformation of spherical to irregular Pd metal occurrs,resulting in a distinctive structure with Pd metal covered by RuO_(2).It has been demonstrated that elevated melting temperatures significantly promote the reduction of PdO.RuO_(2) and Pd metal are the predominant phases in glass melts at melting temperature of 1000℃and above.
作者
朱侨峰
孟祥达
冯晋阳
牛晨晨
刘玉洁
赵庆彬
徐凯
ZHU Qiaofeng;MENG Xiangda;FENG Jinyang;NIU Chenchen;LIU Yujie;ZHAO Qingbin;XU Kai(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China)
出处
《硅酸盐通报》
北大核心
2025年第12期4557-4566,共10页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(U2241290)。
