Study on direct reduction of iron ore powder at low temperature
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 1 025 ℃,and the violent reaction temperature is 1 210 ℃.
differential thermal analysiscoal-based reductionironmakingdirect reductioncarbon-oxygen ratio
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