Ironmaking process for using sludge drying by off gas of fluidized bed for iron reduction

PURPOSE: An ironmaking process to recycle waste sludge in smelting reduction process is provided, which is characterized in that waste sludge is dried by off gas from fluidized bed reduction furnaces, thus reduce manufacture cost. CONSTITUTION: In an ironmaking facility comprising one or more fluidized bed reduction furnaces(2,3,4) for reducing iron ore fines charged as forming a fluidized bed, a melter-gasifier(1) for manufacturing hot metal by melting and reducing the reduced iron fines after receiving reduced iron fines from a final reduction furnace(2) in the fluidized bed reduction furnaces(2,3,4), and a cyclone(9) for circulating particulate ore in the flue gas by collecting off gas of the melter-gasifier(1) and supplying the particulate ore removed flue gas into reduction gas of the fluidized bed reduction furnaces(2,3,4) through a reduction gas pipe(5), wherein the final reduction furnace(2) is connected to the melter-gasifier(1) through an iron charging pipe(7), the cyclone(9) is connected to a powder injection unit(15) for injecting molten and agglomerated particulate ore into the melter-gasifier(1), and the powder injection unit(15) is connected to a powder storage tank(12), the ironmaking method for recycling sludge by using off gas of the fluidized bed reduction furnaces comprises the steps of storing the dried sludge into a sludge storage bin(205) after first drying sludge; injecting flue gas of the fluidized bed reduction furnaces(2,3,4) to a pneumatic conveying pipe(206) one end of which is connected to the one side of the powder storage tank(12), and the other end of which is connected to the sludge storage bin(205); and pneumatic conveying the sludge into the powder injection unit(15) as finally drying the first dried sludge using flue gas after supplying the first dried sludge into the pneumatic conveying pipe(206). 본 발명은 용융환원프로세스의 신제선법에서 슬러지를 재활용하는 용철제조방법에 관한 것으로, 그 목적은 유동층환원로의 배가스를 슬러지의 이송가스로 활용하면서 그 헌열로 슬러지를 건조함으로써 슬러지 건조에 필요한 비용을 절감하면서 슬러지를 재활용하여 용철을 제조하는 방법을 제공함에 있다. 상기 목적을 달성하기 위한 본 발명은, 유동층을 형성하면서 장입된 분철광석을 환원하도록 구성되는 1개 이상의 유동층환원로(2, 3, 4), 상기 유동층 환원로중의 최종환원로(2)에서 분환원철을 공급받아 용융환원하여 용선을 제조하도록 구성되는 용융가스화로(1), 상기 용융가스화로(1)의 배가스를 포집하여 배가스중의 미립광석은 용융가스화로(1)에 순환시키고 미립광석이 제거된 배가스는 가스관(5)을 통해 유동층환원로(2, 3, 4)의 환원가스로 공급하는 사이클론(9)을 포함하고, 상기 유동층 최종환원로(2)는 광석장입관(7)을 통해 광석소통관계로 용융가스화로(1)와 연결되고, 상기 사이클론(9)은 용융가스화로(1)내에 미립광석을 포집하여 용융가스화로(1)에 재취입하는 분체취입장치(15)와 분진소통관계로 연결되고, 상기 분체취입장치(15)는 분체취입관계로 분체저장조(12)와 연결되어 구성되는 용철제조설비를 이용한 용철제조방법에 있어서, 슬러지를