Evaluation on Hydration Reactivity of Reactive Magnesium Oxide Prepared by Calcining Magnesite at Lower Temperatures

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• 作者：Jing Zhu ; Nan Ye ; Jianwen Liu ; Jiakuan Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：May 15, 2013
• 年：2013
• 卷：52
• 期：19
• 页码：6430-6437
• 全文大小：577K
• 年卷期：v.52,no.19(May 15, 2013)
• ISSN：1520-5045

文摘

Three methods were used to evaluate hydration reactivity of calcined magnesite products. Both conventional citric acid coloration reactivity test (index of CT) and MgO hydration conversion method (index of X) cannot properly evaluate the reactivity when the magnesite ore decomposes incompletely at lower calcining temperatures. Therefore, a corrected MgO hydration conversion method containing the index of X_corrected is proposed by considering the decomposition ratio of magnesite ore. Results show that decomposition ratio of magnesite ore is quite low at temperatures lower than 650 掳C, which influences the reliability of the conventional reactivity test results (index of CT or X). Reactivity of MgO decreased as the calcining temperature and time increased when the index of X_corrected was used. Hydration reactivity of calcined magnesite at lower temperatures is much higher than that of magnesite calcined at 1100 掳C, no matter which of three evaluation indexes is used (i.e., CT, X, and X_corrected).