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Mineral carbonation using alkaline wastes is an attractive approach to CO 2 utilization. Owing to the difference between waste CO 2 and feedstock CO 2 , developing CO 2 utilization technologies without CO 2 purification and pressurization is a promising concept. This study investigated a potential method for CO 2 utilization via direct aqueous carbonation of synthesized concrete fines under atmospheric pressure and low CO 2 concentration. The carbonation reaction with different solid-liquid ratios and different concentrations of introduced CO 2 was examined in detail. Under basic conditions, a CO 2 uptake of 0.19 g-CO 2 /g-concrete fines demonstrated that direct aqueous carbonation of concrete fines under atmospheric pressure and low CO 2 concentration is effective. The CaCO 3 concentration, degree of carbonation, and reaction mechanism were clarified. Furthermore, characterization of the carbonated products was used to evaluate ways of utilizing the carbonated products.

CO2 Utilization via Direct Aqueous Carbonation of Synthesized Concrete Fines under Atmospheric Pressure

CO₂ Utilization via Direct Aqueous Carbonation of Synthesized Concrete Fines under Atmospheric Pressure