研究报告
张时豪,汪宏涛,丁建华,戴丰乐,姜自超.磷酸镁水泥固化放射性核素90Sr的影响因素研究[J].环境科学学报,2016,36(5):1751-1756
磷酸镁水泥固化放射性核素90Sr的影响因素研究
- Investigation of factors affecting solidification of radioactive 90Sr by magnesium phosphate cement
- 基金项目：国家自然科学基金(No.51272283);重庆市自然科学基金重点项目(No.cstc2012jjB50009)
- 作者
- 单位
- 张时豪
- 后勤工程学院化学与材料工程系, 重庆 401311
- 汪宏涛
- 后勤工程学院化学与材料工程系, 重庆 401311
- 丁建华
- 后勤工程学院化学与材料工程系, 重庆 401311
- 戴丰乐
- 后勤工程学院化学与材料工程系, 重庆 401311
- 姜自超
- 后勤工程学院化学与材料工程系, 重庆 401311
- 摘要：研究了磷酸镁水泥性能、温度、pH、龄期和沸石掺量对磷酸镁水泥固化体中90Sr浸出率的影响,并采用XRD及扫描电镜探讨了磷酸镁水泥固化体的物相和微观结构.试验结果表明:磷酸镁水泥固化体浸出率随磷酸镁水泥强度的增加而减小;低温条件对磷酸镁水泥固化核素90Sr影响明显;酸性环境中磷酸镁水泥受腐蚀状况严重,浸出率和累计浸出分数相对较高;空气养护7 d成型的磷酸镁水泥固化体强度可达58.9 MPa,并具有良好的对核素90Sr固化效果;掺加沸石可以降低磷酸镁水泥固化体浸出率.
- Abstract：The influence of different cement properties, temperature, pH values, curing time and different contents of zeolite on solidifying radioactive 90Sr by MPC was studied. The phase composition and micro-structures of the hydration products of MPC with radioactive 90Sr were investigated by XRD and SEM. The results indicate that the leaching rate decreases when the compressive strength of MPC increases. Low temperature has a significant influence on the solidification. MPC is seriously corroded in acidic environment, which has higher leaching rate and cumulative leaching fraction. The compressive strength of MPC cured 7 d can reach 58.9 MPa, and the MPC cured 7 d has good effect on solidifying radioactive 90Sr. The leaching rate decreases along with increasing content of zeolite.
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