【摘要】 以天然锆英石、模拟放射性焚烧灰、CaCO3、TiO2、UO2为原料,采用高温固相反应,对人造岩石固化掺铀模拟放射性焚烧灰进行研究。借助XRD、SEM、抗浸出性能测试等分析测试方法,研究固化体的性能。结果表明:在空气气氛下烧结,固化体的晶相为CaZrTi2O7[Ca(Zr,U)Ti2O7]、CaTiSiO5、CaTiO3和CaUO4,一部分U固溶于Ca(Zr,U)Ti2O7中;较多CaZrTi2O7的生成有利于Ca(Zr,U)Ti2O7固溶更多的U;模拟放射性焚烧灰掺量为60%、UO2含量为6.88%的人造岩石固化体,1~35 d铀的归一化浸出率为0.17~2.81μg/(cm2.d),42~192 d铀的归一化浸出率为0.09~0.13μg/(cm2.d)。更多还原

【Abstract】 The researches on synroc immobilization of simulated radioactive incineration ash（SRIA） doped uranium were carried out by solid-state reaction at high temperature,using zirconite,SRIA, CaCO₃,TiO₂ and UO₂ as raw materials.The properties of synroc form were investigated by means of X-ray diffraction analysis,scanning electron microscope analysis and leaching property test.The results indicate that the crystal phases of synroc form sintered in air are zirconolite CaZrTi₂O₇[Ca（Zr,U）Ti₂O₇],sphene（CaTiSiO₅）,CaTiO₃ and CaUO₄.A part of uranium is solidified in Ca（Zr,U）Ti₂O₇.The more CaZrTi₂O₇ is propitious to solidifying the more uranium in Ca（Zr,U）Ti₂O₇.The unitary uranium leaching rates of synroc form doped SRIA of 60% and UO₂ of 6.68% are 0.17-2.81 μg/（cm²·d） for 1-35 d and 0.09-0.13 μg/（cm²·d） for 42-192 d.更多还原