【作者】 孟庆民； 李家新； 春铁军； 魏汝飞； 王平； 龙红明；

【Author】 Meng Qingmin;Li Jiaxin;Chun Tiejun;Wei Rufei;Wang Ping;Long Hongming;School of Metallurgical Engineering, Anhui University of Technology;School of Metallurgy, Northeastern University;

【机构】 安徽工业大学冶金工程学院； 东北大学冶金学院；

【摘要】 利用含碳球团高温强度在线测试装置,研究了非等温加热条件下还原剂种类、配碳量等对铁精矿含碳球团热态强度的影响,结合含碳球团还原后试样的气孔率和微观结构分析,讨论了热态强度变化机理。结果表明:含碳球团还原焙烧过程中受到外力破坏作用时,存在压溃和塑性变形两种状态。球团热态强度在200~800℃时较干燥后强度略有增加,超过800℃后强度显著下降,在1000℃左右达到强度最低值。含碳球团热态强度变化与球团气孔率变化具有一定关联性,200~1000℃时,球团热强度源自颗粒间的分子引力和粘结剂膨润土的粘滞力作用,高于1000℃后,球团热强度靠金属铁连晶维系。更多还原

【Abstract】 The thermal strength characteristics and mechanism of the carbon-bearing iron ore pellets in the non-isothermal heating process, including the effect of reducing agent and carbon content on the thermal strength, were studied by the on-line test device of thermal strength, combined with the samples microstructure and porosity after reduction. When the carbon-bearing iron ore pellets was damaged by external force at high temperatures, it existed in two states: crush and plastic deformation. The thermal strength of the pellets slightly increased at 200~800 ℃, significantly decreased after 800 ℃and reached the minimum value at 1000 ℃. There is a correlation between the thermal intensity of the carbon-bearing iron ore pellets and its porosity, at 200~1000 ℃, the thermal strength of the pellets was derived from the molecular attraction between the particles and viscous force from bonding agent. But when the temperature higher than 1000 ℃, the thermal strength was served by aggregation of iron crystals.更多还原