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In page Steelmaking:
"In a blast furnace, iron oxides are reduced by a combination of CO, H2, and carbon. Only around 10% of the iron oxides are reduced by H2. With H2 enrichment, the proportion of iron oxides reduced by H2 is increased, consuming less carbon is consumed and emitting less CO2.[1] This process can reduce emissions by an estimated 20%.[citation needed]
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