摘要
用X射线粉晶衍射分析技术结合热重分析、红外光谱及电镜观察对合成的含钙聚合氯化铝铁(PAFCCa)及其合成前体含钙聚合氯化铝(PACCa)、含钙聚合氯化铁(PFCCa)的低温干燥样进行了表征。XRD衍射结果表明,Ca(Ⅱ)分别与A l(Ⅲ)、Fe(Ⅲ)都能形成结晶化合物,在PACCa中结晶化合物主要是Ca3A l2(OH)12,在PFCCa中结晶化合物主要是Ca4Fe14O25,在PAFCCa中形成A l-Ca-Fe三相结晶化合物铁取代的氯钙矾石结构体,其组成是(Ca6(A l,Fe)2[(OH)4C l2]3.20H2O)。热重分析、红外光谱与电镜观察都支持了XRD的衍射结果。
The synthesized calcium-containing polyaluminum ferric chloride (PAFCCa) and its co-aggregating materials calcium-containing polyaluminum chloride (PACCa) and calcium-containing polyferrie chloride( PFCCa), characterized by X-ray diffraction (XRD) with thermal analysis (TG-DTG) and Fourier-Transform-Infrared Spectroscopy (FTIR), Transmission and Scan Electron Microscopy coupled with Energy Dispersive Spectroscopy (TEM-EDS, SEM-EDS) on the air-dried samples. The XRD patterns displayed that Ca( Ⅱ ) combined with Al( Ⅲ ) and Fe( Ⅲ ) and formed crystalline phases Ca-Al-hydroxides ( Ca3Al2 (OH) 12 ) , Ca-Fe-oxides ( Ca4Fe9O17 ), and Al-Ca-Fe-hy- droxides ( Ca2 ( Al, Fe)2O5 ) in PAFCCa, respeetively. The hydrogrossular structure may be Ca6 ( Al, Fe)2 [ (OH)4 Cl2 ]3 .20H2O). SEM observations showed that crystals of the air-dried sample with n(Al)/n(Fe) = 3: 7. PAFCCa are large pellets made of smaller granules and crystals in n(Al)/n(Fe) = 7: 3. PAFCCa are hollow tubes of ettringite-like structure, these are regarded as the direct evidence of different species when n( Al)/n(Fe) 〉 6:4 or n( Al)/n(Fe) 〈 6:4 in PAFCCa solutions. The results are supported by TG-DTG and FTIR analyses.
出处
《矿物学报》
CAS
CSCD
北大核心
2009年第2期259-267,共9页
Acta Mineralogica Sinica
基金
贵州省科学技术基金项目(黔科合J字[2008]2231号)
四川省重点学科资助项目(SZD0407)
关键词
含钙聚合氯化铝铁
铁取代的氯钙矾石
表征形态
Calcium-containing poly-aluminum-ferric-chloride hydrolysate
Fe substituted chloride ettringite
species
characterization