废机油包容量对水泥固化体性能的影响

Study on the influence of radioactive waste oil capacity on the performance of cement waste form

本文采用硫铝酸盐水泥结合乳化固化法对模拟放射性废机油进行固化处理,以固化体中不同机油包容量为变量,参照国标GB 14569.1—2011分析了固化体的力学性能、抗浸出性能及冻融性能。结果表明,当机油包容量小于25%(质量比)时,固化体性能满足国标GB 14569.1—2011相关要求。在此基础上,采用梯度升温法、TG、XRD、静态氮吸附仪考察了不同机油固化体的热稳定性能、孔隙率及物项组成,实验结果表明,固化体中机油包容量小于16.67%时,固化体热稳定性性能优良,机油包容量为12.5%时,固化体微观孔隙和孔径最小,故该包容量下固化体强度最高,当机油包容量小于25%时,机油不会抑制硫铝酸盐水泥的水化过程及水泥固化体的孔径分布微分曲线。

The total amount of radioactive organic waste oil that is temporarily stored is small.And it's not easy to be solidified directly.In this paper,sulphur-aluminate cement and emulsion solidification method are used to solidify the simulated radioactive waste engine oil.Taking different oil capacity in the solidification matrix as the variable,the mechanical properties,leaching resistance and freeze-thaw properties of the solidification matrix are analyzed in accordance with the national standard GB 14569.1—2011.The results show that when the oil capacity is less than 25%(mass ratio),the properties of the solidification matrix meet the relevant requirements of national standard GB 14569.1—2011.On this basis,the thermal stability,porosity and phase composition of different oil solidification matrix were investigated by gradient temperature rise method,TG,XRD,SEM and static nitrogen adsorption instrument.The experimental results show that when the oil capacity is less than 16.67%,the thermal stability of the solidification matrix is excellent.When the oil capacity is 12.5%,the micro pores and pore diameter of the solidification matrix are the smallest,so the strength of the solidification matrix under this oil capacity is the highest.When the oil capacity is less than 25%,the addition of engine oil will not inhibit the hydration process of sulphur-aluminate cement and the differential curve of pore size distribution of cement solidification matrix.