Capturing CO₂ Emissions in the Iron Industries using a Magnetite–Iron Mixture

We examined a mixture of magnetite (Fe 3 O 4 ) and iron (Fe) as a possible CO 2 sorbent easily applicable for any ironmaking industries. The mixture reacts with CO 2 to form siderite (FeCO 3 ). Our experimental results illustrate a capture capacity of 7.98 mmol for the reactant mixture at 200 °C and 10 bar CO 2 pressure in 3 h. The results also show that the kinetics of the carbonation reaction vastly depend on the applied temperature and CO 2 pressure. The magnetite was completely regenerated by heating siderite at 350 °C under air flow. The proposed set of reactions can be integrated at any ironmaking sites and can provide a potential solution for CO 2 capture in the future.