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用透射电镜、扫描电镜、热分析及矿物谱学等手段对含钙铝铁水解聚合产物(含微量硅)合成初期样品及其陈化9年后样品组成物相的形态演化进行了观察对比研究。结果表明,含钙铝铁溶液合成初期迅速形成类钙矾石双羟合结构体,其结构中部分Al3+被Fe3+取代、SO42-阴离子被Cl-离子替代,无定形的铝铁共聚物、铝硅共聚物和多种铝、铁、钙氢氧化物(氧化物)微晶竞争存在。缺氧条件下铝铁水解产物的演化由于氯、钙离子的存在而与文献的报道有所不同。陈化改变了含钙聚合铝(铁)溶液中的长程有序结构。其中的类钙矾石双羟合结构体在高Cl-、低pH环境下长期陈化过程经历了溶解-再结晶作用。大量的铁微晶相溶解形成富铝水羟合铁(ferrihydrite)胶体结构,Cl-与Ca2+以键合或共沉淀方式进入富铝水羟合铁(ferrihydrite)相。富铝水羟合铁(ferrihydrite)胶体最终的结晶相还是β-FeOOH。
The morphological evolution of the initial samples synthesized by calcium aluminate hydration polymerization (including trace silicon) and the phase composition of the sample after 9 years of aging were observed and compared by means of TEM, SEM, thermal analysis and mineralogy. . The results show that the rapid formation of ettringite bisurene early in the synthesis of calcium aluminum ferric solution, the structure part of Al3 + is replaced by Fe3 +, SO42- anion is replaced by Cl- ions, amorphous aluminum-iron copolymer, Al-Si Copolymers and a variety of aluminum, iron, calcium hydroxide (oxide) crystallites exist competition. Under the condition of anoxia, the evolution of hydrolysates of aluminum and iron is different from those reported in the literature due to the existence of chlorine and calcium ions. Aging has changed the long-range ordered structure in calcium-containing polymeric aluminum (iron) solutions. Among them, the ettringite bisurene undergoes dissolution-recrystallization during long-term aging under high Cl- and low pH conditions. A large amount of iron crystallites dissolve to form a ferrihydrite-rich colloidal structure, and Cl- and Ca2 + enter the ferrihydrite-rich ferroushydrite phase by co-precipitation or coprecipitation. The final crystalline phase of ferrihydrite-rich colloidal aluminum is also β-FeOOH.