Kinetic Analysis for Formation Process of Sr-Bearing Ye'elimite
Kinetic Analysis for Formation Process of Sr-Bearing Ye'elimite
复制标题
含锶冶铁矿形成过程的动力学分析
DOI：
10.1007/s10904-017-0653-2
复制
发表时间：
2017-11-01
影响因子：
4
通讯作者：
Chang, Jun
中科院分区：
文献类型：
--
作者：
Zhao, Jiuye;Chang, Jun
用Sr2+离子取代钙离子(C(4)A(3)$)，合成了含锶极品。本文报道了3CaO中心点SrO中心点3A(2)lO(3)中心点SO3 (C（3)A(3)$）的形成过程及动力学分析。3CaO中心点SrO中心点3A(2)lO(3)中心点SO3 (C（3)A(3)$）是一种含锶极板。将C(4)A(3)$和C(3) $的熟料分别在不同温度和延长时间下烧结，采用Rietveld定量物相分析对熟料进行定量。针对等温过程，采用不同的动力学模型进行统计拟合。此外，通过拟合Arrhenius方程，得到了C(4)A(3)$和C(3)A(3)$的活化能值，并进行了比较。结果表明：C(3)A(3)$的生成主要来源于中间相与硫酸盐的反应。C(4)A(3)$和C(3)A(3)$形成的重叠温度范围在1150 ~ 1300℃之间，C(3)A(3)$趋于稳定在1350℃直到180 min。C(3)A(3)$的形成机制符合三维扩散，Jander模型得出C(4)A(3)$和C(3)A(3)$的相关系数最高。C(3)A(3)$的生成活化能为367.9 kJ/mol，高于C(4)A(3)$的300.8 kJ/mol。烧结温度主要影响C(3)A(3)$颗粒的微观形貌，但对元素分布和组成没有影响。
Sr-bearing ye'elimite is synthetized through substitutions of Sr2+ ions for Ca2+ ions in ye'elimite (C(4)A(3)$). Here, we report formation process and the kinetic analysis of 3CaO center dot SrO center dot 3A(2)lO(3)center dot SO3 (C(3)A(3)$) which is a type of Sr-bearing ye'elimite. Clinkers of C(4)A(3)$ and C(3)A(3)$ were respectively sintered at different temperatures and prolong time, Rietveld quantitative phases analysis was conducted to quantify the clinkers. Specific to the isothermal process, different kinetic models were used for statistical fitting. Additionally, through fitting with Arrhenius equation, values of activation energy for both C(4)A(3)$ and C(3)A(3)$ were obtained and compared. The results show that formation of C(3)A(3)$ mainly derives from reaction between intermediate phases and sulfates. Overlapping temperature range for formation of both C(4)A(3)$ and C(3)A(3)$ is between 1150 and 1300 A degrees C, C(3)A(3)$ tends to be stable at 1350 A degrees C until 180 min. Formation mechanism of C(3)A(3)$ accords with three-dimensional diffusion, Jander model yields the highest correlation coefficients for both C(4)A(3)$ and C(3)A(3)$. Activation energy for formation of C(3)A(3)$ equals to 367.9 kJ/mol, which is higher than that of C(4)A(3)$ (300.8 kJ/mol). Sintering temperature mainly affects micro-morphology of C(3)A(3)$ particles, but has no influence on elemental distribution and compositions.