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本文为MgO活性从定性估计提高到定量测定提供了方法,同时亦为MgO生产工艺条件控制及镁质胶凝复合材料制品质量的提高提供了理论依据。 本文用热分析方法测定和研究了MgO的活性。使不同活性的MgO在相同条件下水化,生成Mg(OH)_2,利用热分析方法热解Mg(OH)_2,根据它们的DTA和TG曲线,求得脱水反应时的各种特性参数,并用以计算动力学参数——活化能(E)等,进而由这些参数评定MgO的活性。文中着重研究了MgO活性与煅烧温度之间的关系,发现当煅烧温度为800～850℃时,由菱镁矿煅烧所得的MgO活性最高。文章还以胶凝材料的力学性能证明了上述实验的正确性。 影响MgO活性的因素很多,除煅烧温度外,还有煅烧时间、存放时间等,实验证明这些因素的影响远比煅烧温度的影响小。
This article provides a method for quantitative analysis of MgO activity from qualitative estimation to quantitative determination, and also provides a theoretical basis for the control of MgO production process conditions and the quality improvement of magnesium cementitious composite products. In this paper, the thermal analysis method was used to measure and study the activity of MgO. The MgO with different activity was hydrated under the same conditions to produce Mg (OH) 2, and the Mg (OH) 2 was pyrolyzed by thermal analysis. According to their DTA and TG curves, various characteristic parameters of dehydration reaction were obtained and used To calculate the kinetic parameters - activation energy (E) and so on, and then evaluate the activity of MgO by these parameters. In this paper, the relationship between the activity of MgO and the calcination temperature is studied emphatically. It is found that when the calcination temperature is 800 ~ 850 ℃, the activity of MgO calcined by magnesite is the highest. The article also confirms the correctness of the above experiments with the mechanical properties of cementitious materials. Many factors affect the activity of MgO, in addition to calcination temperature, there are calcination time, storage time, the experimental results show that the impact of these factors far less than the impact of calcination temperature.