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In pre-combustion CO2 capture for power production, fossil fuels and/or biomass are first converted to syngas. Water-gas shift (WGS) is then used to increase both the CO2 and H2 contents of the syngas by reacting CO with steam. CO2 separation yields a H2-rich product for power production. The high partial pressure in pre-combustion capture processes creates a strong driving force for CO2 separation. Blast furnace gas (BFG) also has a relatively high carbon content compared to other syngas stream. This paper explores the use of a pre-combustion CO2 capture technology with BFG. The produced hydrogen can be integrated in the steel plant for either power production or top gas recycling. A new interaction model for CO2 and H2O for the hydrotalcite materials used in SEWGS (sorption-enhanced water-gas shift) was developed, based on experimental results measured across the relevant temperature and pressure range. New effects are seen, in terms of the interaction of H2O and CO2 which lead to profound differences when these properties are used in a full description of the SEWGS cycle. This leads to an increase in efficiency for the SEWGS-BFG case of almost 2% points compared to preciously reported efficiencies, which is caused by both a decrease in the required steam of more the 50% in the cycle, and general improvements in the overall integration of the SEWGS system with an integrated steel mill.