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

HsingJung Ho | Zendy; Atsushi Iizuka | Zendy; Etsuro Shibata | Zendy; Hisashi Tomita | Zendy; Kenji Takanо | Zendy; Takumi Endo | Zendy

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

Author(s) -

HsingJung Ho,

Atsushi Iizuka,

Etsuro Shibata,

Hisashi Tomita,

Kenji Takanо,

Takumi Endo

Publication year - 2020

Publication title -

acs omega

Language(s) - English

Resource type - Journals

ISSN - 2470-1343

DOI - 10.1021/acsomega.0c00985

Subject(s) - carbonation , carbonatation , raw material , atmospheric pressure , aqueous solution , chemical engineering , materials science , carbon dioxide , environmental science , pulp and paper industry , waste management , chemistry , composite material , organic chemistry , geology , oceanography , engineering

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.

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