The Study of Influence Amino Acid Salts Additive on Efficiency of Ca2+ Extraction in Inorganic Carbonation Using MEA, Supernatant and Solid Matter of Ready Mixed Concrete (RMC)

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In this study, we dealt with inorganic carbonation included in foresaid CCU. Inorganic carbonation in which metal cations in waste or natural materials react with captured CO₂ produces useful carbonates such as CaCO₃. Ready ixed Concrete (RMC), one of the industrial waste, recycling water was selected as metal ion (Ca²⁺) source. A used solution included 400 g of absorbent (30 wt% MEA + 3 wt% additive using RMC-L as solvent) and 100 g of RMC-S. We wanted to identify whether amino acid salts including piperazine (PZ), beta-alanine (BALA) and gamma-aminobutylic acid (GABA) influence Ca²⁺ extraction efficiency of two forms obtained from the RMC recycling water. CO₂ loading of adding PZ, BALA and GABA in absorption process were 2.7902, 2.6517 and 2.6404 mol CO₂/L solution, respectively. And, CO₂ loading of additives in re-absorption process were 1.7295, 1.5735 and 1.2666 mol CO₂/L solution, respectively. SiO₂, CaCO₃ (vaterite) and CaCO₃ (calcite) were main components. precipitate of solutions using PZ, BALA and GABA included 39.08 %, 39.24 % and 35.27 % of CaCO₃.