高钙粉煤灰地聚合物固化/稳定重金属的试验研究  

Experimental Analysis High-calcium Fly Ash Geopolymers Solidification/Stablization of Heavy Metals

作　　者：郭晓潞[1,2] 施惠生[1,2] 

机构地区：[1]同济大学 先进土木工程材料教育部重点实验室 [2]环境材料研究所,上海201804

出　　处：《土木建筑与环境工程》2013年第2期124-128,共5页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(51172164;51208370);高等学校博士学科点专项科研基金(20110072120046);污染控制与资源化研究国家重点实验室开放课题(PCRRF12025)

摘　　要：利用高钙粉煤灰研制地聚合物来固化/稳定重金属,采用静态和动态浸出试验研究了高钙粉煤灰地聚合物对重金属的固化/稳定效果,并进一步探索了重金属的迁移机制和长期安全性。研究表明:高钙粉煤灰地聚合物分别固化/稳定0.025%的铅,0.025%的铬和0.01%的汞后,经静态浸出试验,重金属浸出浓度远低于规定的上限值,且固化率均在98%以上。经动态浸出试验,重金属的实时浸出浓度低于规定的上限值,累积浸出浓度在72h后趋于稳定;固化体中重金属的径向分布相似;重金属的有效扩散系数和浸出率非常低,长期安全性优良。Utilization of high calcium fly ash geopolymer to solidify/stabilize heavy metals was explored.The solidification/stabilization effectiveness of heavy metals was studied using static and dynamic leaching experiments.Additionally,transferring mechanism and long-term safety of heavy metals in geopolymer were also investigated.The results show that the leaching concentrations of heavy metals from the solidified/stabilized matrix were far lower than the limit values,and all the solidified/stabilized ratios of heavy metals reached 98% when the geopolymer solidified/stabilized 0.025% Pb（II）,0.025% Cr（VI）,and 0.01% Hg（II）,respectively.The results Dynamic leaching experiment show that real-time leaching concentrations of heavy metals were lower than allowable maximum values,and the accumulated leaching concentrations became stable after 72 h.After dynamic leaching experiment,the radial distributions of heavy metals in geopolymer specimens were similar.Effective diffusion coefficient and dynamic leaching ratios of heavy metals from geopolymer were very low,and this geopolymer has a good long-term safety.

关 键 词：高钙粉煤灰 地聚合物 重金属 浸出浓度 迁移机制 长期安全性 

分 类 号：TQ172[化学工程—水泥工业]