CO2-fixing and recovery of high-purity vaterite CaCO3 from recycled concrete fines

Hamideh Mehdizadeh,Kim Hung Mo,Tung-Chai Ling

Resources, Conservation and Recycling（2023）

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摘要

•Indirect carbonation of recycled concrete fines (RCF) using NH4Cl was successfully proposed.•Process parameters in maximizing Ca2+ extraction and CO2 sequestration were optimized.•NH4Cl was an efficient solvent for Ca2+ extraction of RCF compared to HCl and CH3COOH.•Valuable high-purity vaterite CaCO3 (97.8%) was recovered from RCF.•CO2 sequestration and vaterite CaCO3 yield were 270 and 615 g/kg-RCF, respectively.

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关键词

Leaching-carbonation process,Recycled concrete fines,CO2 sequestration,Wet carbonation,Vaterite calcium carbonate,Ammonium chloride

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