A carbon dioxide supply unit that supplies carbon dioxide by treating flue gas generated in the molten iron manufacturing process; A slag supply unit for crushing and drying molten slag containing calcium oxide and magnesium oxide to supply the crushed slag; A slag hydration unit for hydrating the crushed slag by reaction with a reaction gas containing steam to supply hydrated slag; And a slag carbonization unit for carbonizing the hydrated slag by reacting the hydrated slag with the carbon dioxide.
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