工程科学学报2016，Vol.38Issue(5)：623-629,7.DOI:10.13374/j.issn2095-9389.2016.05.005
硼铁精矿的碳热还原动力学
Carbothermic reduction kinetics of boron-bearing iron concentrate
摘要
Abstract
In order to deeply understand the carbothermic reduction mechanism of boron-bearing iron concentrate, the isothermal reduction of boron-bearing iron concentrate/carbon composite pellets was performed with high purity graphite as a reductant, and was kinetically analyzed by the integration method. The reduction temperature was set as 1000, 1050, 1100, 1150, 1200, 1250 and 1300℃, and the C/O molar ratio was 1. 0. When the reduction degree ranged from 0. 1 to 0. 8, the reduction temperature had important effect on the apparent activation energy and rate controlling step. If the reduction temperature was not greater than 1100℃, the aver-age apparent activation energy was 202. 6 kJ·mol-1 , and the rate controlling step was carbon gasification. But if the reduction tempera-ture was higher than 1100℃, the average apparent activation energy was 116. 7 kJ·mol-1 , and the reduction rate was the mixed control of carbon gasification and FeO reduction reaction. When the reduction degree was not less than 0. 8 ( reduction temperature>1100℃) , the reduction might be controlled by carbon diffusion in metallic iron. Carbon gasification is the main rate controlling step for the reduction of the composite pellet due to the intense chemical inhibition effect of boron in the boron-bearing iron concentrate on carbon gasification.关键词
铁精矿/硼/碳热还原/还原动力学Key words
iron concentrate/boron/carbothermic reduction/reduction kinetics分类
矿业与冶金引用本文复制引用
王广,薛庆国,沈颖峰,王静松..硼铁精矿的碳热还原动力学[J].工程科学学报,2016,38(5):623-629,7.基金项目
国家自然科学基金资助项目(51274033,51504216) （51274033,51504216）
中央高校基本科研业务费专项资金资助项目(FRF-TP-16-019A1) （FRF-TP-16-019A1）
