热分析技术在褐铁矿结晶水热分解中应用研究

来源期刊：钢铁2011年第5期

论文作者：李金莲 刘万山 李艳茹 任伟 周明顺

文章页码：19 - 22

关键词：褐铁矿； 结晶水； 活化能； 非等温动力学

Key words：limonite； crystal water； activation energy； non-isothermal kinetics

摘    要：利用热分析(TG、DTG、DSC)技术,在一定升温速率(β=10℃/min)下对褐铁矿结晶水热分解进行非等温动力学研究,采用Coats-Redffen法求解了褐铁矿结晶水热分解过程的活化能。结果表明:褐铁矿结晶水热分解过程是一个缓慢—快速—缓慢的过程,其在烧结过程中吸收热量与结晶水含量不成正相关,而与热分解活化能成正相关。

Abstract: The thermal analysis technology(TG,DTG and DSC) was applied to kinetic analysis for non-isothermal thermal decomposition of crystal water in limonite(β=10℃/min).The method of Coats-Redffen was been applied to determine the activation energy for the thermal decomposition of crystal water in limonite.The results indicate that the process of thermal decomposition of crystal water limoniteis is divided into three steps,the first step is slow reaction,subsequent is quick reaction,at last is slow reaction.The adsorption heat of sintering process is not a positive relationship with the content of crystal water,but it is a positive relationship with the activation energy.