摘要
研究了循环流化床超细粉煤灰(CFA)基地质聚合物固化Zn^(2+)。首先研究了Zn^(2+)的加入对固化体强度的影响,并通过浸出实验、EDS、XRD、FT-IR等表征手段探究了固化效果和固化机理。Zn^(2+)以Zn(NO_3)_2·6H_2O的形式加入,掺量分别是0.5wt%、1.0wt%、1.5wt%(均以硝酸锌占CFA的质量百分含量表示)。研究证明,CFA基地质聚合物和Zn^(2+)具有较好的相容性,微观结构致密,90 d空白样品强度达到85.2 MPa,1.5wt%Zn^(2+)掺量下强度仍保持50%左右,CFA基地质聚合物能很好地实现大掺量Zn^(2+)的固化,固化率在99%以上。Zn^(2+)的固化存在物理(ZnO为主)和化学(含Zn新相)两种作用。
It was studied the immobilization of Zn2＋ in circulating fluidize bed fly ash （CFA） based geopolymer. It was firstly studied the effect of Zn2＋ on the strength of CFA based geopolymer, then the degree and mechanism of the immobilization via leaching test, SEM- EDS, XRD, and FT- IR. Zn2＋ was added in the form of Zn （N0 3）2 ？ 6H20 with amount of 0. 5wt% , 1. Owt% , and 1. 5wt% （weight percent of CFA）. The experiments prove that CFA based geopolymer exhibited good compatibility, the matrix of geopolymers are dense with/without Zn dosage. The strength of blank sample is 85. 2 MPa at 90 d , and strength of 1. 5wt% Zn2＋ desaged sample is half of blank sample. It is also indicated that immobilization rates of geopolymers with large dosage of Zn2＋ are all higher than 99% . It is assumed that Zn2＋ is immobilized by physical （ZnO phase） and chemical （new phase contained Zn） process.
作者
刘泽
张媛
周瑜
王栋民
LIU Ze;ZHANG Yuan;ZHOU Yu;WANG Dong-min(School of Chemical and Environmental Engineering,China University of Mining and Technology（ Beijing） ,Beijing 100083 ,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第4期1320-1323,1337,共5页
Bulletin of the Chinese Ceramic Society
基金
国家重点研发计划(SQ2017YFSF050163)
中央高校基本科研业务费(2009QH02
2009KH09)
