Phase Diagrams for the Ternary Na2O−Al2O3−H2O System at (150 and 180) °C

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• 作者：Wei Jin ; Shili Zheng ; Hao Du ; Hongbin Xu ; Shaona Wang ; Yi Zhang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2010
• 出版时间：July 8, 2010
• 年：2010
• 卷：55
• 期：7
• 页码：2470-2473
• 全文大小：131K
• 年卷期：v.55,no.7(July 8, 2010)
• ISSN：1520-5134

文摘

The full alkali concentration range phase diagrams of the Na₂O−Al₂O₃−H₂O system were constructed at (150 and 180) °C. The compositions of the clear liquids and wet solid phases were analyzed by inductively coupled plasma atomic emission spectrometry (ICP-AES), and the results show that, as the Na₂O concentration increases, the Al₂O₃ solubility initially increases monotonically, to maximum values of 100 w (mass fraction) = 33.58 and 35.86 at (150 and 180) °C, respectively, and then decreases. At both temperatures, the solid phases were determined to be Al₂O₃·H₂O, Na₂O·Al₂O₃·2.5H₂O, Na₂O·Al₂O₃, and NaOH by X-ray diffraction coupled with Schreinemaker’s method. The phase diagrams indicate that, as the temperature increases, the Na₂O·Al₂O₃·2.5H₂O phase region shrinks, while that of the Na₂O·Al₂O₃ phase expands.