人造岩石固化掺铀模拟放射性焚烧灰

滕元成; 张朝彬; 车春霞; 曾冲胜; 周冠南

doi:10.7538/yzk.2008.42.01.0043

人造岩石固化掺铀模拟放射性焚烧灰

Synroc Immobilization of Simulated Radioactive Incineration Ash Doped Uranium

摘要

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CaZrTi₂O₇Ca（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. 81 μg/(cm²•d)，42～192 d铀的归一化浸出率为0. 09～0. 13 μg/(cm²•d)。

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 CaZrTi₂O₇Ca(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.

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