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In page Blast furnace:

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A 2000 report from the International Energy Agency Greenhouse Gas Technical Collaboration Programme (IEAGHG)[9] shows that 70% of the CO2 emissions from integrated steel plants arise directly from the blast furnace gas (BFG). By treating BFG with carbon capture technology prior to use for heat exchange and energy recovery within the plant, a portion of these emissions can be abated. The report estimates that chemical CO2 absorption would cost $35/t of CO2, plus $8–20/t CO2 for transportation and storage.[9] At the time, this would have increased steel production costs by 15–20%,[2][citation needed] presenting a barrier to decarbonisation for steelmakers which typically operate with margins of 8–10%.[10] As of 2024 no blast furnaces have been equipped with carbon capture technology.