摘要
重金属铅污染是重大的环境问题,利用磷酸镁水泥体系可对重金属铅进行稳定/固化。研究了不同硝酸铅掺量对磷酸镁水泥水化进程的影响,并对水化产物的晶体形貌、浸出毒性进行了探讨。研究表明:硝酸铅掺量的增加(最大掺量2.5%)对磷酸镁水泥的凝结时间影响不大,对水化产物种类(MgKPO4.6H2O和Mg3(PO4)2)无影响,但水化产物形貌有所变化。磷酸镁水泥对硝酸铅进行固化的浸出毒性试验结果(0.5mg/L左右)比国家标准要求(5mg/L)低一个数量级。EDS检测出Pb元素存在于水泥水化产物中。
Lead pollution is one of the significant environmental problems. Different contents lead nitrate stabilization/solidification by the magnesium phosphate cement was studied. The influence of lead nitrate on hydration process of phosphate magnesium cement and the crystal behaviors and leaching toxicity of the samples were investigated. The results show that： the increase of the lead nitrate （maximum dosage for 2.5 %） would not take obviously effect on phosphate magnesium cement setting time and the hydration products （MgKPO4 . 6H2O and Mg3 （PO4）2 ） except morphology. Solidification/solidification of lead nitrate was good on magnesium phosphate cement. Its leaching toxicity testing results （0.5 mg/L）were controlled under the national standard （5 mg/L）. EDS shows Pb exists in the form of hydration products.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2011年第10期21-23,29,共4页
Journal of Wuhan University of Technology
基金
国家自然科学基金(2010j0109)
青年科学基金(51002110)
关键词
磷酸镁水泥
硝酸铅
水化
浸出毒性
magnesium phosphate cement
lead nitrate
hydration
leaching toxicity
