铁矿粉低温直接还原研究  

Study on direct reduction of iron ore powder at low temperature

作　　者：白晨晨 杨广庆 武龙飞 马保良 BAI Chenchen;YANG Guangqing;WU Longfei;MA Baoliang(College of Metallurgy and Energy,North China University Science and Technology,tangshan 063210,China;Xingtai Iron and Steel Corp.,Ltd,Xingtai 054027,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]邢台钢铁有限责任公司,河北邢台054027

出　　处：《粉末冶金工业》2024年第3期15-20,共6页Powder Metallurgy Industry

基　　金：国家自然科学基金资助项目(52174312);河北省自然科学基金-高端钢铁冶金联合基金资助项目(E2021209151)。

摘　　要：国内主要采用的炼铁工艺为高炉炼铁法和熔融还原法,二者均为高温冶金工艺,且能耗均较高,而冶炼温度较低的气基还原法又受到国内天然气资源的限制发展困难。煤基直接还原法由于能耗高且产能较低,故发展缓慢。为了降低其能耗以及还原成本,试验通过差热分析,研究了不同铁矿粉和煤粉之间的还原机制;通过对不同配比的铁矿粉煤粉进行差热分析,研究了降低铁矿粉直接还原过程最低反应温度,期望寻找降铁矿粉直接还原温度的最佳方法。研究结果表明:PB粉矿相对于钒钛铁矿还原过程中煤粉消耗量更少煤比更低,但最大吸热量略高于两种钒钛铁矿粉。当选择PB粉和无烟煤,碳氧比值为1.25即配碳量为铁矿粉质量的24.45%时,铁矿粉还原反应的反应进行温度最低,此时初始反应温度为1 025℃,剧烈反应温度为1 210℃。The main ironmaking processes in China are blast furnace ironmaking and smelting reduction,both of which are high temperature metallurgical processes with high energy consumption,while the gas-based reduction method with low smelting temperature is difficult to develop due to the limitation of domestic natural gas resourc-es.The coal-based direct reduction method develops slowly due to high energy consumption and low productivity.In order to reduce its energy consumption and reduction cost,in this paper,the reduction mechanism between different iron ore powder and coal powder is studied by differential thermal analysis experiment.Through the dif-ferential thermal analysis of coal powder with different proportions of iron ore powder,the best method of direct reduction temperature of iron ore powder is expected to be found.The results show that PB powder ore relative to vanadium and titanium iron ore reduction process in the consumption of coal powder less coal ratio is lower,but the maximum heat absorption is slightly higher than the two vanadium and titanium iron ore powder.When PB powder and anthracite are selected,and the ratio of carbon to oxygen is 1.25,namely,the carbon content is 24.45% of the mass of iron ore powder,the reaction temperature of iron ore powder reduction is the lowest.At this time,the initial reaction temperature is 1025°C,and the violent reaction temperature is 1210℃.

关 键 词：差热分析 煤基还原 炼铁 直接还原 碳氧比 

分 类 号：TF55[冶金工程—钢铁冶金]