Myoungwook Mun, Heechan Cho
In this research, blast furnace slag and waste cement were reacted with various acids at the same concentration (0.1 M) under atmospheric conditions, in order to determine their efficiency for mineral carbonation. Based on maximum calcium concentration (2400 mg/L) and selectivity (99%), waste cement was selected as a suitable material for mineral carbonation, and further experiments were conducted with HCl, CH3COOH, and NH4Cl as effective extractants. At low acid concentrations, the concentration of calcium was similar regardless of acid type used. Increasing acid concentration revealed a linear relationship with the maximum ratio of calcium extraction, but the ratio of increment depended on the type of acid. Although the yield of calcium extracted when using NH4Cl was lower than that extracted when using HCl and CH3COOH, vaterite was precipitated in carbonation without a basic reagent. Moreover, the NH4Cl regenerated during carbonation can be reused for calcium extraction. The reaction of waste cement and acids was analyzed using PHREEQC.
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title={Study on characteristics of various extr},
author={Myoungwook Mun and Heechan Cho},
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