BLAST FURNACE AND METHOD FOR OPERATING A BLAST FURNACE
World Intellectual Property Organization Patent
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Abstract
The problem addressed by the invention is that of creating a blast furnace and a method for operating a blast furnace that are suitable for reducing the CO2 emission and the amount of additives and heating fuels compared to currently used metallurgical plants. This problem is solved by a process for processing metal ores, comprising the following steps: reducing a metal ore, in particular a metal oxide; producing a top gas containing CO2 in a blast-furnace shaft; discharging the top gas from the blast furnace; conducting at least part of the top gas directly or indirectly to a CO2 converter and reducing the CO2 contained in the top gas to CO in the CO2 converter; and conducting at least a first part of the CO from the CO2 converter into the blast-furnace shaft. In addition to the solution of the problem stated above, CO is produced by means of the process as a gaseous reductant that can be easily introduced into the blast-furnace shaft. A blast furnace for extracting metal that operates in accordance with the process comprises the following: a blast-furnace shaft having a first top-gas outlet and at least one CO inlet; a CO2 converter, which has a CO2 converter entry and a CO2 converter gas inlet for gases containing CO2 and is suitable for reducing CO2 to CO; wherein the top-gas outlet is connected directly or indirectly to the CO2 converter gas inlet; and wherein the CO2 converter has at least a first CO outlet for discharging a first part of the CO produced in the CO2 converter, the at least first CO outlet being connected directly or indirectly to the blast-furnace shaft.
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