外包法直接还原钛铁矿过程的动力学研究  

Study on Kinetics of Direct Reduction Process of Ilmenite

作　　者：侯景潇 汪琦[1] 

机构地区：[1]辽宁科技大学化学冶金辽宁省重点实验室,辽宁鞍山114051

出　　处：《有色金属（冶炼部分）》2014年第2期18-20,38,共4页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(50974071)

摘　　要：采用外包还原剂的方法对钛铁矿进行直接还原试验,研究了直接还原钛铁矿的动力学。结果表明,半焦粉直接还原钛铁矿分为两个阶段,第一阶段是升温阶段和恒温的初始阶段,受界面化学反应控制,表观活化能为113.14kJ/mol;第二阶段为恒温阶段,受固相中气体的内扩散控制,表观活化能为180.13kJ/mol。温度对还原度和还原速率的影响显著。随着温度的升高,还原度随之升高,反应速率加快;延长恒温时间也可以提高还原度。Direct reduction of ilmenite was conducted by reductant wrapping to investigate kinetics of direct reduction ofilmenite. The results show that the process of semi-coke powder direct reduction o{ ilmenite is divided into two stages. Controlled by interracial chemical reaction with activation energy of 113.14 kJ/mol, the first stage is of characteristics of temperature rising and initial homoiothermy. The second stage is a period of constant temperature controlled by diffusion of gases in solid phase with activation en- ergy of 180.13 kJ/mol. Temperature has a remarkable effect on reduction in terms of degree and speed. Increasing temperalure results in rise of both reduction degree and reaction rate. Prolonging constant tem- perature period can improve reduclion degree with a slow increase of reaction rate.

关 键 词：钛铁矿 直接还原 动力学 

分 类 号：TF823[冶金工程—有色金属冶金]