文献类型：期刊文献

中文题名：硫酸钙的还原热分解特性研究

英文题名：Study on the Character of Calcium Sulfate Reducing Decomposition

作者：张雪梅[1];徐仁伟[1];孙淑英[1];宋兴福[1];于建国[1]

机构：[1]华东理工大学国家盐湖资源综合利用工程技术研究中心,上海200237

年份：2010

卷号：33

期号：S2

起止页码：144

中文期刊名：环境科学与技术

外文期刊名：Environmental Science & Technology

收录：CSTPCD;;北大核心:【北大核心2008】；CSCD:【CSCD_E2011_2012】；

基金：青海省2008年度重大科技攻关项目(2008-G-149);教育部新世纪人才计划(NCET-08-0776);上海市重点学科建设项目(B506)

语种：中文

中文关键词：硫酸钙;还原分解;热重分析;非等温动力学

外文关键词：calcium sulfate;reducing decomposition;thermogravimetric analysis;non-isothermal

摘要：为了有效利用工业副产石膏,降低硫酸钙分解能耗,文章对硫酸钙的还原热解特性进行了研究。采用Gibbs-Helmholtz方程、Van't Hoff方程、Kirchhoff方程分别对硫酸钙在不同还原剂中的分解热力学进行计算,结果表明加入还原剂可降低硫酸钙的分解温度。采用整体优化的多升温速率(2.5,5,7.5,10,15K/min)等转化率迭代法对硫酸钙与碳的反应进行动力学计算,求得反应活化能为259.92kJ/mol,反应机理为相边界反应,机理函数为α2/3,指前因子为3.2452×109s-1。
In order to use anhydrite effectively and reduce the energy consumption of CaSO4 decomposition,the changes of standard molar Gibbs function of reaction at proposed temperature were calculated through Gibbs-Helmholtz,Van't Hoff and Kirchhoff equations.The results showed that the addition of reductant could reduce the decomposition temperature.TG data were used to explore the mechanism of the reaction and calculate the apparent activation energy with a globally optimized iterative iso-conversion method at the different heating rate(2.5,5,7.5,10,15K/min).It had been demonstrated that the apparent activation energy was 259.92kJ/mol,the reaction mechanism belonged to the phase boundary reaction and the corresponding pre-exponential factor was 3.2452×109s-1.