Transformation of NaCaHSiO₄ to sodalite and katoite in sodium aluminate solution

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• 作者：Shaowei You ; Yifei Zhang ; Fangfang Chen ; Shaotao Cao ; Yi Zhang
• 关键词：NaCaHSiO4 ; Sodalite ; Katoite ; Red mud ; Hydrogarnet
• 刊名：Hydrometallurgy
• 出版年：January, 2014
• 年：2014
• 卷：141
• 期：Complete
• 页码：43-48
• 全文大小：1017 K

文摘

The decomposition of NaCaHSiO₄ in sodium aluminate solution was investigated. NaCaHSiO₄ transformed to sodalite and katoite during decomposition. Parameters, such as Na₂O concentration, reaction time, temperature and Al₂O₃ concentration, had a significant influence on the NaCaHSiO₄ decomposition. The optimal Na₂O concentration and reaction time for the NaCaHSiO₄ decomposition were 150 g/L and 105 min, respectively. The extent of NaCaHSiO₄ decomposition largely depended on Al₂O₃ concentration in sodium aluminate solution. Reaction products were composed of thin flakes with a loose structure at 50 g/L of Na₂O concentration, and were agglomerates with a compact surface composed of tabular and rod crystals at 150 g/L of Na₂O concentration.