Instantaneous Solid鈥揕iquid鈥揋as Carbonation of Ca(OH)2 and Chameleonic Phase Transformation in CO2-Expanded Solution

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• 作者：Abdul-Rauf Ibrahim ; Xiaoli Zhang ; Yanzhen Hong ; Yuzhong Su ; Hongtao Wang ; Jun Li
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：June 4, 2014
• 年：2014
• 卷：14
• 期：6
• 页码：2733-2741
• 全文大小：622K
• 年卷期：v.14,no.6(June 4, 2014)
• ISSN：1528-7505

文摘

In this study, a CO₂-expanded ethanol鈥搘ater solution system was applied for the solid鈥搇iquid鈥揼as carbonation of Ca(OH)₂ to CaCO₃. The system revealed, for the first time, instantaneous (within 1 min) conversions of Ca(OH)₂ (95.1鈥?00.0%) with the volume ratios of ethanol between 10% and 80%, indicating that both the water content and the expansion of the system take effect in the carbonation process. The instantaneous carbonation with 80% ethanol ratio led to production of 12.8% aragonite polymorph. Further examination of this carbonation case under different reaction times found that, interestingly and importantly, pure calcite phase was stabilized within a short time (210 min) as compared to those reported in the literature; however, in this period, the system exhibited chameleonic phase transformation between calcite, aragonite, and vaterite, normal to abnormal and vice versa.