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AssigneeKloeckner CRA Technologie GmbH
InventorsHans-Georg Fassbinder, Jonathan P. Moodie, Trenna R. Turner
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A method for two-stage melt reduction of iron ore, in which iron ore is prereduced substantially to wustite and at the same time melted down in a melting cyclone, and then liquid hot metal is produced in an iron bath reactor connected to the outlet of the melting cyclone and receiving the melted wustite by adding carbonaceous fuels and oxidizing gas to the melt. The resulting reaction gas from the melt is afterburned, and the dust-laden, partly burned reaction gases from the iron bath reactor are accelerated and further afterburned by adding a hot blast with a temperature of 800.degree. C. to 1500.degree. C., and at least a portion of such accelerated, after burned reaction gases are introduced into the melting cyclone to reduce and melt fresh iron ore.
In a method for the two-stage melt reduction of iron ore wherein iron ore is prereduced substantially to wustite and melted down in a melting cyclone, and the melt from the melting cyclone is introduced into an iron bath reactor wherein the melt is converted into liquid hot metal by addition of carbonaceous fuel and oxidizing gas, with reaction gases produced in the reactor being afterburned in the reactor in a first afterburning step to form afterburned reaction gases and sent at least in part to the melting cyclone, the improvement comprising accelerating and further afterburning the afterburned reaction gases from the iron bath reactor sent to the melting cyclone after the afterburned reaction gases leave the reactor and before the afterburned reaction gases enter the melting cyclone by adding thereto a hot air blast having a temperature of 800.degree. to 1500.degree. C.
Dependencies are inferred from the claim text.