The behavior of the mixtures 6Al₂Si₂O₇: 12NaOH and 6Al₂Si₂O₇: 12NaOH : 2Al₂O₃ during heat-treatment was studied by means of x-ray diffraction and simultaneous thermal analysis. It was shown that hydrated zeolite LTA forms after ultrasonic treatment and evaporation of a suspension, granulation of paste, and drying. It was determined that sodium aluminum silicate Na6Al₄Si₄O₁₇ is synthesized at temperatures up to 700°C. Sodium aluminum silicate Na₈Al₄Si₄O₁₈ , mullite, and nepheline were found in the systems after heat-treatment at temperatures above 800°C. It is shown that the calculations performed by Friedman’s isoconversion method (differential) and the Kissinger–Akahir–Sunose (integral) method, for which the temperature interval 500 – 800°C is of interest, give close values of E. The growth of the apparent energy of activation with increasing degree of transformation attests a change in the reaction mechanism.

中文翻译：

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基于偏高岭土和氢氧化钠的混合物的热行为

通过X射线衍射和同时进行热分析，研究了混合物6Al ₂ Si ₂ O ₇：12NaOH和6Al ₂ Si ₂ O ₇：12NaOH：2Al ₂ O ₃在热处理期间的行为。已显示在超声处理和悬浮液蒸发，糊料造粒并干燥之后，形成了水合沸石LTA。已确定在高达700℃的温度下合成了硅酸钠铝Na ₆ Al ₄ Si ₄ O ₁₇。硅酸钠铝Na ₈ Al ₄ Si ₄ O ₁₈在高于800°C的温度下进行热处理后，在系统中发现了莫来石，莫来石和霞石。结果表明，用弗里德曼的等转换法（微分）和基辛格-阿卡希尔-苏纳斯（积分）法进行的计算（关注温度区间为500 – 800°C）可以得出近似的E值。表观活化能随转化度的增加而增长证明了反应机理的改变。