| 摘要 |
<p>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).</p> |
