Application of fluidization technology to smelting reduction process

This paper introduces the technologies and characteristics of the iron ore treatment by fluidized bed in several typical smelting reduction processes such as FINEX,FINMET,Circored and HIsmelt.The rules of fine iron ore treatmeat by fluidized bed in smelting reduction are summed up.Taking for reference foreign and domestic practice of fine iron ore treatment with fluidized beds,this paper proposes a new smelting reduction ironmaking process with fine iron ore treatment by fluidized bed.The process is divided,in accordance with its metallurgical features,into four systems,including the fluidizing preheating reduction system which uses reducing gas at about 800℃ to produce DRI at a reduction ratio of 80%; the iron-bath final reduction system which directly uses powdered coal,furnace burden at high temperature and high pre-reduction ratio and pure oxygen to control the post-combustion ratio at about 20%; the gas reforming system which adjusts and transforms the high temperature reducing gas and recycles the top gas;the comprehensive utilization system which makes use of the output gas.