铁矿粉气基直接还原过程中铁晶须生长观察  

Observation on the growth of iron whisker in gas-based direct reduction process of iron ore fines

作　　者：钟昇平 郭磊 丁智勇 郭占成 ZHONG Shengping;GUO Lei;DING Zhiyong;GUO Zhancheng(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《有色金属科学与工程》2018年第1期15-21,共7页Nonferrous Metals Science and Engineering

基　　金：中国博士后基金国家重点研发计划重点专项(2017M610768)

摘　　要：采用五段式卧式加热炉装置,对5种粒度范围的巴西CVRD矿粉进行了不同温度、不同气氛条件下的气基直接还原实验,还原后得到各个条件下具有不同表面颗粒形貌的矿粉样.对还原后的矿粉样进行金属化率检测和扫描电镜下微观形貌观察,发现不同的还原条件对铁矿粉还原过程中矿粉颗粒形貌及颗粒表面铁晶须的生长状况具有重要影响,研究发现,可以从还原条件来控制矿粉颗粒的还原状况及颗粒表面形貌,从而改善气基直接还原中的颗粒黏结状况.Using five sections of horizontal heating furnace device,treat five different sizes of CVRD ore,by selecting different temperature and atmosphere,under certain conditions to direct reduction with gas foundation.After reduction of the ore samples,they have been carried out metallization rate testing and microstructure analysis under scanning electron microscopy(SEM),and found that different reduction conditions have important influence on the morphology of the mineral particles and the growth of the iron whiskers on the surface of the particlesduring the reduction process.Thusthe reduction of the ore power particle and the particle surface morphology can be controlled by the control of the reduction condition.Finding follows that the reduction condition of the iron ore particles and the surface morphology of the particles can be controlled from the reduction condition and so as to improve the bonding condition of the particles in the gas based direct reduction.

关 键 词：气基直接还原 颗粒形貌 铁晶须 金属化率 还原条件 

分 类 号：TF533.1[冶金工程—钢铁冶金]