MgO-MgCl2-H2O体系热力学

2011 International Conference on Electric Technology and Civil Engineering (ICETCE) Pub Date : 2011-05-27 DOI:10.1109/ICETCE.2011.5775854

H. Guan, He Wu

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引用次数: 0

摘要

研究了MgO-MgCl2-H2O体系水化、相变和水解过程中的热力学反应。结果表明，Cl -离子和pH值对水化产物的相稳定性有显著影响。为了获得稳定的5Mg(OH)2·MgCl2·8H2O(5相)，防止其转化为5Mg(OH)2·MgCl2·8H2O(3相)，应控制反应物中MgCl2的用量，避免水化产物中游离Cl−离子过多，并增加MgO的用量，提高体系的pH值。在水固化条件下，将溶液的pH值保持在合适的范围内，有利于降低水化产物在水中的溶解度，保持5相的稳定性。

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Thermodynamics of MgO-MgCl2-H2O system

The thermodynamic reactions in the hydration, phase change and hydrolyzation process of MgO-MgCl2-H2O system were studied in this paper. The results show that Cl⁻ ion and pH value have significant influences on the phase stability of hydration products. In order to achieve a stable 5Mg(OH)2·MgCl2·8H2O(5-phase) and prevent it from transforming into 5Mg(OH)2·MgCl2·8H2O (3-phase), the dosage of MgCl2 in reactants should be controlled to avoid the existence of too many free Cl⁻ ions in hydration products and the dosage of MgO should be increased to enhance the pH value of the system. Under the water curing condition, it is favorable to reduce the solubility of hydration products in water and maintain the stability of 5 phase that the pH value of solution is kept within a suitable range.

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2011 International Conference on Electric Technology and Civil Engineering (ICETCE)

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