含钙铝铁水解聚合产物的矿物学研究Ⅰ：形态和物相

MINERALOGICAL INVESTIGATION OF CALCIUM-CONTAINING Al-Fe HYDROLY-SIS POLYMER PRODUCTS :Ⅰ.CHARACTERIZATION OF THEIR SPECIES

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.