Solubility of Al2O3 in the Na2O−Al2O3−H2O−CH3OH System at (30 and 60) °C

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• 作者：Ying Zhang ; Shili Zheng ; Hao Du ; Shaona Wang ; Yi Zhang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2010
• 出版时间：March 11, 2010
• 年：2010
• 卷：55
• 期：3
• 页码：1237-1240
• 全文大小：200K
• 年卷期：v.55,no.3(March 11, 2010)
• ISSN：1520-5134

文摘

To realize the objective of high alumina yield and a high molar Na₂O/Al₂O₃ ratio in caustic solutions for Bayer plants, this paper presents the solubility of Al₂O₃ in methanol−water solvent mixtures with a fixed mass ratio of methanol to water of 1:1 at (30 and 60)°C and containing various Na₂O concentrations. The Al₂O₃ solubility in the Na₂O−Al₂O₃−H₂O−CH₃OH quaternary system increases with an increase of Na₂O concentration, reaching maximum values of 1.70 % and 2.48 % by weight at (30 and 60) °C, respectively. Then, the solubility decreases with a further increase in the Na₂O concentration. The equilibrium solids are aluminum hydroxide Al(OH)₃ and mono-sodium aluminate hydrate Na₂O·Al₂O₃·2.5H₂O in the different alkali concentration regions. The data show that the solubility of Al₂O₃ in the Na₂O−Al₂O₃−H₂O−CH₃OH quaternary system is much lower than that in the Na₂O−Al₂O₃−H₂O ternary system.