Direct reduction of carburized pre-reduced pellets by microwave heating  

作　　者：胡兵 黄柱成 易凌云 姜涛 

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University [2]Zhongye Changtian International Engineering Co.,Ltd.

出　　处：《Journal of Central South University》2014年第1期351-357,共7页中南大学学报（英文版）

基　　金：Project(NCET-04-0748)supported by the New Century Excellent Talent Planning of China

摘　　要：A new iron-making process using carburized pre-reduced iron ore pellets and microwave heating is investigated. The pre-reduced pellets, with a porous structure, and fine particles are carburized homogeneously at 400-650 ℃ in a CO atmosphere. The carburized carbon not only acts reaction as a reduction agent, but also absorbs microwave in the reduction process. Hence, the carburized pre-reduced pellets can be rapidly reduced by microwave heating. There are three procedures involved in the process, namely, gas-based pre-reduction, low-temperatttre carburization and deep reduction by microwave heating. Carburized pre-reduced iron ore pellets show a rapid temperature rise that is twice as fast as the results for pre-reduced pellets in the laboratory. This not only improves the efficiency of the microwave heating, but also accelerates the reduction of iron oxides. The temperature of the pre-reduced pellets rises to 1050 ℃ in 45 min when the carburization rate is 2.02%, and the metallization rate and compressive strength reach 94.24% and 1725 N/pellet, respectively.A new iron-making process using carburized pre-reduced iron ore pellets and microwave heating is investigated.The pre-reduced pellets,with a porous structure,and fine particles are carburized homogeneously at 400-650 °C in a CO atmosphere.The carburized carbon not only acts reaction as a reduction agent,but also absorbs microwave in the reduction process.Hence,the carburized pre-reduced pellets can be rapidly reduced by microwave heating.There are three procedures involved in the process,namely,gas-based pre-reduction,low-temperature carburization and deep reduction by microwave heating.Carburized pre-reduced iron ore pellets show a rapid temperature rise that is twice as fast as the results for pre-reduced pellets in the laboratory.This not only improves the efficiency of the microwave heating,but also accelerates the reduction of iron oxides.The temperature of the pre-reduced pellets rises to 1050 °C in 45 min when the carburization rate is 2.02%,and the metallization rate and compressive strength reach 94.24% and 1725 N/pellet,respectively.

关 键 词：oxidized pellets PRE-REDUCTION CARBURIZING microwave heating direct reduction 

分 类 号：TF046[冶金工程—冶金物理化学]