| 摘要 |
A process for preparing crude iron and energy-rich, gases, the raw materials being comprised of iron ore concentrate, carbon-containing materials, optionally oxygen gas and electric energy, comprising the combination of the following operations: 1.1: preheating of the iron ore concentrate by means of combustion gases from the combustion of discharged gases from the prereduction according to 1.2 below; 1.2: prereduction of the iron oxides of the concentrate preheated according to 1.1 by means of part of the discharged gases from the arc furnace according to 1.3 below; 1.3: introduction of the concentrate prereduced according to 1.2 into the plasma zone below the electrode of an arc furnace, which contains a crude iron melt, the temperature of which is maintained above 1300 DEG C. by means of adjusted supply of electric energy to the arc, and the content of dissolved carbon of which is maintained at a suitable value by injection of carbon-containing materials into the crude iron phase at a depth below its surface of at least about 20 cm; 1.4: precooling of the gases discharged from the arc by feeding directly into the gas stream an adjusted flow of cooling agent; 1.5: recovering an essential part of the physical heat content of the gases precooled according to 1.4 by heat exchange; and 1.6: utilization of the energy-rich gases heat exchanged according to 1.5 for prereduction according to 1.2 and for an external need as a fuel and or a raw material for syntheses. |
