模拟放射性焚烧灰陶瓷固化的初步研究

PRELIMARY RESEARCH ON CERAMIC IMMOBILIZATION OF SIMULATED RADIOACTIVE INCINERATION ASH

以天然锆英石、模拟放射性焚烧灰为原料,对模拟放射性焚烧灰的陶瓷固化进行了初步研究。借助X射线衍射(XRD)、扫描电镜(SEM)、密度分析等分析测试方法,研究了陶瓷固化体烧结温度和物相组成。结果表明,随着模拟放射性焚烧灰掺量的增加,ZrSiO4的分解温度降低。陶瓷固化体的主要晶相及其烧结温度与模拟放射性焚烧灰的掺量有关,当模拟放射性焚烧灰掺量为20%时,固化体的较佳烧结温度范围是1230～1290℃,主要晶相为ZrSiO4;当掺量40%时,固化体的较佳烧结温度范围是1200～1260℃,主要晶相为ZrSiO4和ZrO2;当掺量60%时,固化体的较佳烧结温度范围是1290～1350℃,主要晶相为ZrO2。

The ceramic immobilization of simulated radioactive incineration ash（SRIA） was studied, using zirconite and SRIA as raw materials. The sintering temperatures and crystal compositions of ceramic form were investigated by means of x-ray diffraction （XRD）,scanning electron microscope （SEM） and density analysis. The results indicate that the decomposition temperature of zirconite depresse with the increase of additive content of SRIA. The main crystals and sintefing temperatures of ceramic forms are related to additive content of SRIA. When the content of SRIA is 20%, the sintering temperatures of ceramic form is 1 230 ℃ - 1 290 ℃ ,and its main crystallization phases is zirconite （ZrSiO4） ; When it is 40%, the sintering temperatures is 1 200 ℃ - 1 260 ℃, the main crystallization phases are zirconite and zirconium dioxide （ZrO2） ; When it is 60%, the sintering temperatures is 1 290 ℃ - 1 350 ℃, and the main crystallization phases is zirconium dioxide.