| 摘要 |
A process for the direct production of sponge iron particles and liquid pig iron from iron ore pellets is described, in which the iron ore is reduced as a loose fill (bed) in a direct-reduction unit by means of hot reduction gases to give sponge iron and is then smelted, in a smelting gasifier, by means of introduced carbon and injected oxygen-containing gas, reduction gas being generated at the same time. At least a portion of the reduction gas, having been cooled to the temperature required for the reduction, is passed into the reduction zone of the direct-reduction unit. A considerable fraction of the carbon and of the reduction gas is due to the initial presence of a mixture of hydrocarbon-containing plastic and petroleum coke and/or coke (breeze). The reduction gases are primarily produced, at least in part, by cracking (from the plastic) and by thermal gasification (from the coke). |
