硅酸盐学报

2CaO·2SrO·3Al2O3·SO3的形成动力学

作者：赵九野常钧

分类号：TQ172.1

出版年,卷(期):页码：2017,45(8):0-0

DOI：

摘要：

研究了一种硫铝酸锶钙矿物2CaO·2SrO·3Al2O3·SO3(C2Š2A3$)的形成过程，采用Rietveld定量方法确定了不同温度、不同保温时间下烧成熟料中C2Š2A3$矿物的含量，并对C2Š2A3$的形成过程进了动力学分析。结果表明：在1 150–1 350 ℃条件下，熟料中C2Š2A3$的含量随着保温时间的延长而增大，在1 350 ℃保温180 min条件下C2Š2A3$的含量达到97.3%；在1 400 ℃条件下，保温超过30 min时，熟料中C2Š2A3$的含量开始减少；在1 450 ℃条件下，熟料中C2Š2A3$的含量随保温时间的延长而降低。形成C2Š2A3$的固相反应符合三维扩散模型，Jander模型具有最好的拟合效果。C2Š2A3$形成过程的活化能Ea为479 kJ/mol。烧成温度主要影响C2Š2A3$矿物颗粒的细观形貌，但是不会影响C2Š2A3$矿物的元素分布及组成。

The formation process of 2CaO·2SrO·3Al2O3·SO3, which is a type of Sr-bearing ye’elimite, was investigated. The content of C2Š2A3$ in clinkers sintered in different temperatures and prolong time was determined via the Rietveld quantitative phase analysis. The formation process follows the kinetic models. The results show that the content of C2Š2A3$ increases with increasing the holding time at 1 150–1 350 ℃, and the content of C2Š2A3$ is 97.3% in clinkers at 1 350 ℃ for 180 min. C2Š2A3$ starts to decompose at 1 400 ℃ when prolong time exceeds 30 min. The content of C2Š2A3$ decreases with increasing the holding time at 1 450 ℃. The solid-phase reaction of C2Š2A3$ formation fits the three-dimensional diffusion model, and the Jander model gives the optimal fitting results. The activation energy of C2Š2A3$ is 479 kJ/mol. The sintering temperature affects the mesoscopic morphology of C2Š2A3$ particles, while does not affect the elementary distribution and component.

基金项目：

国家自然科学基金(51472041)资助项目。

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