| 摘要 |
This is disclosed a process of recovering molten pig iron or steel pre-products from lumpy iron-oxide containing charging substances. The charging substances are reduced to sponge iron in a direct reduction zone, the sponge iron is smelted in a meltdown gasifying zone under supply of carbon carriers and oxygen-containing gas forming a coal fluidized bed, and CO and H2 containing reduction gas is produced, which is injected into the direct reduction zone and reacted there. For the commercial utilization of low-quality scrap grades, such as, e.g., automotive scrap, (a) scrap is charged into the meltdown gasifying zone in addition to sponge iron, (b) the scrap has an apparent weight of between 300 and 1000 kg/m3, preferably between 400 and 600 kg/m3, and (c) the temperature of the coal fluidized bed is maintained at 1,500 DEG to 1,700 DEG C., The scrap passes the coal fluidized bed, is carbonized and is smelted by maintaining reducing conditions, and possibly present organic impurities are pyrolyzed.
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