Kinetics of Voluminal Reduction of Chromium Ore Fines Containing Coal by Microwave Heating  

作　　者：CHEN Jin WANG She-bin ZHANG Meng LIU Jin-ying ZHOU Jian-xiong 

机构地区：[1]College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China [2]12th Research Institute, China Electronics Technology Group Corporation, Beijing 100016, China [3]Institute of Mineral Resources, Chinese Academy of Geological Science, Beijing 100037, China

出　　处：《Journal of Iron and Steel Research International》2008年第6期10-15,共6页

基　　金：Item Sponsored by National Natural Science Foundation of China and Baoshan Iron and Steel Co Ltd of China(50474083)

摘　　要：The kinetics of voluminal reduction of chromium ore fines containing coal （COFCC） by microwave heating was studied. When the molar ratio of carbon to oxygen was 0.84 and that of CaO to SiO2 was 0.39 in COFCC, the temperature rising rate of COFCC by microwave heating was 62.5 ℃/min, 68.75 ℃/min, 70. 59 ℃/min, and 72.22 ℃/min at 1 000 ℃, 1 100 ℃, 1 200 ℃, and 1 300 ℃, respectively. The results show that the voluminal re duction of COFCC by microwave heating at solid-solid phase is first order reaction, with the apparent activation energy of 51. 480 kJ/mol. The limiting step of reaction rate for the overall reaction is the mass transfer of CO in the reduced product layer between dielectric particles of chromium ore and coal.The kinetics of voluminal reduction of chromium ore fines containing coal （COFCC） by microwave heating was studied. When the molar ratio of carbon to oxygen was 0.84 and that of CaO to SiO2 was 0.39 in COFCC, the temperature rising rate of COFCC by microwave heating was 62.5 ℃/min, 68.75 ℃/min, 70. 59 ℃/min, and 72.22 ℃/min at 1 000 ℃, 1 100 ℃, 1 200 ℃, and 1 300 ℃, respectively. The results show that the voluminal re duction of COFCC by microwave heating at solid-solid phase is first order reaction, with the apparent activation energy of 51. 480 kJ/mol. The limiting step of reaction rate for the overall reaction is the mass transfer of CO in the reduced product layer between dielectric particles of chromium ore and coal.

关 键 词：KINETICS microwave heating voluminal reduction ch：omium ore fine 

分 类 号：TF7[冶金工程—钢铁冶金]