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Sun, Yongqi; Tian, Sicong; Ciais, Philippe; Zeng, Zhenzhong; Meng, Jing; Zhang, Zuotai
Nature communications, 01/2022, Volume: 13, Issue: 1Journal Article
The decarbonisation of the iron and steel industry, contributing approximately 8% of current global anthropogenic CO emissions, is challenged by the persistently growing global steel demand and limitations of techno-economically feasible options for low-carbon steelmaking. Here we explore the inherent potential of recovering energy and re-using materials from waste streams, high-temperature slag, and re-investing the revenues for carbon capture and storage. In a pathway based on energy recovery and resource recycling of glassy blast furnace slag and crystalline steel slag, we show that a reduction of 28.5 ± 5.7% CO emissions to the sectoral 2 °C target requirements in the iron and steel industry could be realized in 2050 under strong decarbonization policy consistent with low warming targets. The technological schemes applied to engineer this high-potential pathway could generate a revenue of US$35 ± 16 and US$40 ± 18 billion globally in 2035 and 2050, respectively. If this revenue is used for carbon capture and storage implementation, equivalent CO emission to the 2 °C sectoral target requirements is expected to be reduced before 2050, without any external investments.
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