Abstract In this study, binary f-CaO in steel slag was simulated and prepared. By synthesizing different proportions of binary f-CaO, the influence of carbonization on the binary f-CaO, its carbonization performance, and hydration activity were investigated. When the iron content increased, the hydration activity of binary f-CaO decreased, and the hydration rate of the CaO·0.3FeO sample (77.01%) was the lowest. The main products of binary f-CaO carbonization are cubic calcite and rod-shaped aragonite. With the progress of carbonization, the carbonization degree of binary f-CaO increased and then decreased with the increase in iron content. Among them, the carbonization rate of CaO·0.1FeO was the highest (96.91%). The carbonization can effectively react Ca2Fe2O5 in binary f-CaO to improve its carbonization degree. Finally, compared with hydration, the ability of carbonization to remove CaO was improved by 18.01%.Graphical Abstract
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