【作者】 王兆才； 储满生； 赵庆杰； 赵凯； 柳政根；

【Author】 Wang Zhaocai Chu Mansheng Zhao Qingjie Zhao Kai Liu Zhenggen (School Materials & Metallurgy Northeastern University,Shenyang,110004)

【机构】 东北大学材料与冶金学院；

【摘要】 综合考虑国内炼铁资源条件及钢铁产业发展现状,发挥国内丰富的非焦煤资源优势,发展煤制气-竖炉直接还原是我国海绵铁生产的主要方向。首先,本研究对基于国内资源制备的氧化球团进行了相关的性能检测。结果表明,采用国产铁精矿生产的氧化球团完全可适用于气基竖炉直接还原。在此基础上,改变还原温度和气氛对球团进行了气基还原反应,研究了不同实验条件对还原反应速率的影响,并进行了系统的气-固反应动力学机理分析。研究表明,在850～1050℃之间,还原温度上升和还原气氛中H₂含量增加均对还原反应进行相对有利,但H₂含量超过50%后对反应速率影响不大;H₂或CO做还原剂时,前者还原进程多为界面化学反应限制,而后者为气体内扩散和界面化学反应混合控速。更多还原

【Abstract】 By considering the situa tion of domestic resources and steel industry development,establishing coal gasification - shaft furnace direct reduction technology is main direction of sponge iron production in China.Firstly,the Physical performance and metallurgical properties of oxidized pellet is tested in the study.The tests have shown that it can be completely used as raw materials for gas direct reduction in shaft furnace.And then the effect of the temperature and gas composition on reaction process of direct reduction iron from pellet and gas-solid reaction kinetic mechanism has been investigated.The experiments were carried out in between 850～1050℃.The conclusions could be drawn as follows:The reduction rate increases with the increase of temperature and hydrogen content.But this trend grew fainter when the mixture gas contains 50%hydrogen.The reduction rate is controlled by interfacial chemical reaction in hydrogen atmosphere,but in carbon monoxide atmosphere the reduction rate is controlled by both interfacial chemical reaction and the gas intrinsic diffusion through the product layer.更多还原