| 摘要 |
<p>1451040 Production of steel from ore FRIED KRUPP GmbH 21 May 1975 [22 May 1974] 21837/75 Heading C7D Oxidic iron ore is reduced to iron sponge, added to molten iron in a melting vessel and reacted with carbonaceous material and an O 2 -containing gas wherein the whole of the off-gas from the melting vessel is reacted with carbonaceous material and steam and/or CO 2 , and the gases' formed are recycled to reduce the ore to sponge. Ore 2 is reduced in furnace 1 by reducing gas (mainly CO and H 2 ) at preferably, 800-1100‹C, the sponge passing to a melt in melting vessel 4 in which carbonaceous material 5 (e.g. coal dust, coke dust, or hydrocarbons) and O 2 containing gas 6 (e.g. O 2 or enriched air) are injected below the melt surface. The steel is tapped, further refined and/ or alloyed at 22 and cast at 26. The off-gas 7 is reacted with coal or coke dust, and steam and/or CO 2 in reactor 8, cleaned at 11, and recycled to furnace 1 for reducing ore. The off gas from furnace 1 has dust, water and CO 2 removed at 13, 14, a portion is subjected to the water gas reaction at 17, and a portion 16 is burnt with O 2 , 19, the heat produced heating the circulating gas. The gas is heated at 18 and combined with the stream 18 from the melting vessel. The melting vessel may be a pressure vessel, and the reactor 8 may be integral with the vessel 4, e.g. the reactor 8 may be the upper part of vessel 4, where no melt is present.</p> |
