模拟非α低中放废液水合陶瓷固化体的水化产物和力学性能

Hydration Products and Mechanical Properties of Hydroceramics Solidified Waste for Simulated Non-alpha Low and Intermediate Level Radioactive Wastes

以模拟非α低中放废液为固化处理对象,用水热法合成了非α低中放废液中和处理后沉淀的"碱-矿渣-粉煤灰-偏高岭土"水合陶瓷固化体。采用X射线衍射仪分析了固化体的水化产物,确定了水化产物的组成,并测试了固化体的抗压强度。研究结果表明:温度为150～180℃、废液沉淀与固化原材料的质量比值(即盐灰比)为0.10～0.30时,固化体水化产物的主要物相为方沸石,随着温度升高和反应时间延长,水化产物中方沸石的衍射峰不断增加。固化体抗压强度测试结果表明,该固化体具有较高的抗压强度,但盐灰比由0.10增加至0.30时,固化体抗压强度由26.33 MPa下降到8.46 MPa。

In this paper, simulated non- alpha low and intermediate level radioactive wastes was handled as curing object and that of ＂alkali-slag-coal fly ash-metakaolin＂ hydroceramics waste forms were prepared by hydrothermal synthesis method. The hydration products were analyzed by X ray diffraction. The composition of hydrates and the compressive strength of waste forms were determined and measured. The results indicate that the main crystalline phase of hydration products were analcite when the temperature was 150 to 180 ℃ and the salt content ratio was 0.10 to 0.30. Analcite diffraction peaks in hydration products is increasing when the temperature was raised and the reaction time prolonged. Strength test results show that the solidified waste forms have superior compressive strength. The compressive strength gradually decreased with the increase in salt content ratio in waste fornls.