Effects of Temperature on the Properties of α-High-level Radioactive Waste Immobilized, Hardened Magnesium Phosphate Cement
FU Mingjiao1, YANG Hailin1,2, WU Chuanming1, ZHANG Ying2, YOU Chao1, QIAN Jueshi1
1 College of Materials Science and Engineering, Chongqing University, Chongqing 400045; 2 College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067
Abstract: The magnesium potassium phosphate cement (MPC) were used for immobilization of liquid acidic α-high-level radioactive waste (HLW). This work focused on the impact of heat-treatment temperature on mechanical property, phase, microstructure and Cs+ leaching rate of the solidified MPC. BET, XRD, SEM and AAS results showed that the ambient temperature reaction of MgO, KH2PO4 and HLW could form a dense structure, several kinds of phosphate was interspersed in the structure. The solidified MPC dehydrated with the increase of heat-treatment temperature, and obtained more pore structure, large average pore size, lower compressive strength and high Cs+ leaching rate after sintering at 400℃. As the temperature continued to rise, the solidified MPC was sintered and formed ceramic while the average pore diameter decreased and the compressive strength increased. The solidified MPC turned into ceramic structure after sintering at 900 ℃. Crystal grains melt down completely. The 28 d leaching rate of Cs+ in the solidified MPC was 7.21×10-6 g/(cm2·d). The leaching rate of Cs+ could reach the performance requirements of the vitrification form agent of the MPC solidified liquid with HLW at different heat-treatment temperatures, which showed obvious advantages of MPC in solidifying the HLW.
傅明娇,杨海林,吴传明,张 影,尤 超,钱觉时. 温度对含模拟α-高放核废液的磷酸镁水泥固化体性能的影响[J]. 《材料导报》期刊社, 2017, 31(24): 86-90.
FU Mingjiao, YANG Hailin, WU Chuanming, ZHANG Ying, YOU Chao, QIAN Jueshi. Effects of Temperature on the Properties of α-High-level Radioactive Waste Immobilized, Hardened Magnesium Phosphate Cement. Materials Reports, 2017, 31(24): 86-90.
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2017, Vol. 31 
