碳包覆不同形貌纳米铁氧化物的还原分析  

Reduction analysis of carbon-coated nanometer iron oxides with different morphologies

作　　者：郝素菊 高一策 蒋武锋 孙天昊 张玉柱 薄荷 HAO Su-ju;GAO Yi-ce;JIANG Wu-feng;SUN Tian-hao;ZHANG Yu-zhu;BO He(Ministry of Education Key Laboratory of Modern Metallurgy Technology,College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063009,Hebei,China;School of Materials Engineering,Tangshan Vocational College of Science and Technology,Tangshan 063001,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院现代冶金技术教育部重点实验室,河北唐山063009 [2]唐山科技职业技术学院材料工程系,河北唐山063001

出　　处：《中国冶金》2022年第3期27-33,共7页China Metallurgy

基　　金：国家自然科学基金资助项目(51274084);河北省自然科学基金资助项目(E2018209323)。

摘　　要：为了抑制铁矿粉在还原过程中铁晶须的生长,采用水热炭化法对球状、棒状2种不同形貌的纳米氧化铁进行了碳包覆,并用热重法对碳包覆铁氧化物的还原行为进行了研究。同时,采用场发射扫描电子显微镜(FE-SEM)分析了铁氧化物、碳包覆铁氧化物还原后样品的形貌。结果表明,与普通铁矿粉相比,纳米氧化铁还原温度大幅降低;升温速率越小,越有利于析炭反应在氧化铁表面进行;球状氧化铁比棒状氧化铁还原过程中更易生成须状物,碳包覆可以有效抑制氧化铁还原过程中须状物的产生。In order to inhibit the growth of iron whiskers during the reduction of iron ore powder,the spherical and rod-shaped nano-iron oxides with different morphologies were carbon-coated by hydrothermal carbonization,and the reduction behavior of carbon-coated iron oxides was studied by thermogravimetric method.Field emission scanning electron microscope(FE-SEM)was used to analyze the morphology of iron oxide and carbon-coated iron oxide after reduction.The results show that compared with ordinary iron ore powder,the reduction temperature of nano-iron oxide is greatly reduced.The smaller the heating rate is,the more favorable the carbon precipitation reaction to proceed on the surface of iron oxide is.Spherical iron oxide is easier to generate whiskers during the reduction process than rod-shaped iron oxide.Carbon coating can effectively inhibit the generation of whiskers during the iron oxide reduction process.

关 键 词：碳包覆 铁氧化物 还原 升温速率 铁晶须 热重 

分 类 号：TF552[冶金工程—钢铁冶金]