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用钕模拟三价锕系核素,研究掺钕钙钛锆石基钛酸盐组合矿物固化体的制备技术及性能,可为锕系放射性废物的安全固化处理提供理论基础。以ZrSiO4、CaCO3、TiO2、Al2O3、Nd2O3为原料,采用热压烧结制备掺钕钙钛锆石基钛酸盐组合矿物固化体。利用X射线衍射、扫描电镜、背散射二次电子像、能谱等分析手段,研究掺钕钙钛锆石基钛酸盐组合矿物固化体的制备工艺、物相组成、显微结构和晶粒(微区)成分。结果表明:热压烧结组合矿物固化体的主要晶相为钙钛锆石固化体,次要晶相是榍石和钙钛矿的固化体;热压烧结的较佳烧结条件为1 130℃、30 MPa保温2 h;固化体的相对密度为99.24%,晶粒细小,晶界不明显。
Using neodymium to simulate trivalent actinide series nuclides and studying the preparation technology and properties of neodymium-doped calcium-zirconia-based titanate composite mineral solidified bodies can provide a theoretical basis for the safe solidification treatment of actinide radioactive waste. The Nd-doped calcium-zirconia-based titanate composite mineral solidification bodies were prepared by hot-press sintering using ZrSiO4, CaCO3, TiO2, Al2O3 and Nd2O3 as raw materials. The preparation technology, phase composition, microstructure and grain of Nd-doped calcium-zirconium-based titanate composite mineral solidification body were studied by means of X-ray diffraction, scanning electron microscopy, backscattered secondary electron image and energy spectrum analysis (Micro-area) composition. The results show that the main crystal phase of the hot-pressed consolidated mineral solidified body is a solidified body of calcium-titanium zircon and the minor crystalline phase is a solidified body of scum and perovskite. The optimum sintering conditions of hot-pressed sintering are 1 130 ℃, 30 MPa insulation 2 h; cured body relative density of 99.24%, fine grain, grain boundary is not obvious.