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分别以NaOH和Ca(OH)2作为碱化剂,合成了聚合氯化铝铁(PAFCNa,PAFCCa),比较样聚合氯化铝(PACNa,PACCa)、聚合氯化铁(PFCNa,PFCCa),制成低温干燥样进行热分解检测。热重分析证明,PAFCCa中的含水量高,主要是配位水与结晶水。当n(A l)/n(Fe)>5∶5后,PAFCCa的含水量平均为42.3%。按Ca6A l2(SO4)3(OH)12.26H2O分子式计算,钙矾石的结构水(含OH水)含量为43.06%,两者含水量相当接近。TG-DTG热分析结果支持XRD对PAFCCa中存在含Ca3A l2(OH)12柱体的类钙矾石结构体的认定。PAFC-Ca根据其DTG曲线上的125℃和180℃两个脱水速率(肩)峰可以判别其中有无钙矾石结构体,以及相对量的多少。
Polymerization aluminum chloride (PAFCNa, PAFCCa), PACAa (PACCa) and PFCNa (PFCCa) were synthesized by using NaOH and Ca (OH) Into a low temperature dry sample for thermal decomposition detection. Thermogravimetric analysis shows that PAFCCa has high water content, mainly coordinated water and water of crystallization. When n (Al) / n (Fe)> 5: 5, the water content of PAFCCa averaged 42.3%. According to the formula of Ca6Al2 (SO4) 3 (OH) 12.26H2O, the content of structured water (containing OH water) of ettringite is 43.06%, the water content of both is quite close. The results of TG-DTG thermal analysis support the identification of ettringite structures containing Ca3Al2 (OH) 12 in PAFCCa by XRD. PAFC-Ca based on its DTG curve at 125 ℃ and 180 ℃ two dehydration rate (shoulder) peak can be identified with or without ettringite structure, and the relative amount of the number.