摘要
为了研究在炼焦过程中配加铁矿粉对焦炭性能的影响,在气煤中配加0、5%和10%的铁矿粉炼制铁焦,采用I-型转鼓、差热分析仪、SEM、XRD和光学显微镜对铁焦的强度、反应性、微观结构、微晶结构和光学组织进行研究,并采用Coats-Redfern方法计算气化反应的动力学参数。结果表明,在气煤中配加铁矿粉可以有效提高铁焦的转鼓强度及反应性,随着铁矿粉配比的增加,铁焦的堆垛高度Lc值逐渐减小,石墨化程度降低,并且铁焦的气孔逐渐减小,且附着于气孔表面的铁原子密度增大,出现成片含铁区域,焦炭结构中各向同性结构和镶嵌结构减少,残炭结构增多。根据动力学分析可知,配加0、5%和10%的铁矿粉制得的铁焦,其活化能分别为228.4、235.5和256.7k J/mol,并且发现表观活化能与指前因子具有动力学补偿作用。
In order to clarify the effect of iron ore fines which were added during coking process on the coke properties, three different iron ore blend ratios （0,5% and 10%） were used to make iron-coke. I-type drum, thermogravimetric analyser, SEM, XRD and optical microscope were used to investigate the properties of iron-coke, such as strength, reactivity, microstructure, crystallite structure and optical texture. Moreover, the method of Coats-Redfern was used to calculate the kinetics parameters of the gasification reaction. The results showed that it could increase the cold strength and reactivity of iron-coke by adding iron ore fines into gas coal. With the increase of iron ore blend ratio, the stacking height Lc value of iron-coke and the gphitization degree decreased. The pore size of iron-coke became smaller as well. The density of Fe atom attaching to the surface of the pore increased, and a piece of iron region was found. The isotropic and mosaic structure in coke was reduced, while the residual carbon structure was increased. According to the kinetics analysis, the activation energy of iron-coke with 0, 5% and 10% iron ore fines blend ratio was 228.4,235.5 and 256.7 kJ/mol, respectively. Meanwhile, it was found that the apparent activation energy and pre-exponential factor had a kinetic compensation effect.
出处
《钢铁》
CAS
CSCD
北大核心
2016年第9期22-29,共8页
Iron and Steel
基金
中央高校基本科研业务费资助项目(FRF-IC-14-007)
国家重点基础研究发展(973)计划资助项目(2012CB720400)
高等学校学科创新引智计划资助项目(B13004)
关键词
气煤
铁矿粉
气化反应
强度
反应性
光学组织
动力学
gas coal
iron ore fines
gasification reaction
strength
reactivity
optical texture
kinetics
