摘要
在还原过程中,铁矿石中各元素之间相互耦合反应,对还原过程产生促进或者抑制的影响。基于此,实验利用综合热分析仪探究不同MgO掺量对氢气还原赤铁矿过程的影响,并结合各阶段反应的TG曲线变化,计算各阶段反应的动力学参数。结果表明,MgO掺量对氢还原HABF赤铁矿各阶段反应出现不同的影响趋势:反应第二阶段随着MgO掺量增加,活性位点数量增多,对还原具有促进作用;反应第三阶段形成难还原的铁酸镁,而MgO·Fe_(2)O_(3)缓慢分解出MgO·Fe O,还原速度减慢,整体表现为抑制作用。此外,较适宜的MgO掺量为0.4%~0.6%,对应平均表观活化能相对较低为95.43~95.84 k J/mol。
During the reduction process,the elements in the iron ore are coupled with each other,which promotes or inhibits the reduction process.The study utilized a comprehensive thermal analyzer to examine the effects of different MgO additions on the hydrogen reduction of hematite.By analyzing the TG curves for each stage of the reaction,kinetic parameters were calculated.The results show that MgO addition affects the hydrogen reduction of HABF hematite in different ways.In the second stage of the reaction,with the increase of MgO content,the number of active sites increased,which promoted the reduction.However,in the third stage,the formation of refractory magnesium ferrite and the slow decomposition of MgO·Fe_(2)O_(3)to MgO·FeO slow the reduction rate,exhibiting an overall inhibitory effect.Optimal MgO addition is found to be between 0.4%and 0.6%,with corresponding average activation energies of 95.43~95.84 kJ/mol.
作者
张勇
张珈铭
张雄伟
张志亮
朱陈瑾杭
柴轶凡
Zhang Yong;Zhang Jiaming;Zhang Xiongwei;Zhang Zhiliang;Zhu Chenjinhang;Chai Yifan(Inner Mongolia CISP Technology Co.,Ltd.;Inner Mongolia University of Science and Technology)
出处
《冶金能源》
北大核心
2025年第5期3-9,共7页
Energy For Metallurgical Industry
基金
国家自然科学基金资助项目(51904161,52364043)
内蒙古自治区科技计划资助(2022JBGS0042)
内蒙古自治区高等学校青年科技英才支持计划(NJYT22060)
内蒙古自治区直属高校基本科研业务费项目(2022QNJS011)。
关键词
赤铁矿矿粉
氢冶金
动力学
非等温还原
hematite ore powder
hydrogen metallurgy
kinetics
non-isothermal reduction
