The integrated CO₂ absorption-mineralization (IAM) process has been recognized as one of the most promising carbon capture technologies, but its reaction pathway and process stability for any one alkaline solid waste still worthy to be studied. This work mainly explored the effects of binary amine solvent mixing ratio, reaction time and ash dosage on a single-step IAM process of Ca-rich purified dust (PD), and to evaluate the cyclic performance of this process. The results showed that the amine mixed solution composed of 1.5 mol/L monoethanolamine (MEA) and 1.5 mol/L dimethylethanolamine (DMEA), performed well in terms of liquid-based CO₂ loading (0.933 mol/L), CO₂ sequestration capacity (246.21 g/kg), and CO₂ mineralization efficiency (35.97 %). All the mineralized products existed as calcite CaCO₃ in the single MEA or DMEA solution with 3 mol/L, while the formation of metastable vaterite CaCO₃ was more favoured in the MEA-DMEA binary amine. The vaterite CaCO₃ started to be formed in mineralized products after single-step IAM process lasted for 40 min at the optimal amine ratio. In-situ regeneration and reusing of MEA-DMEA solvents were proved to be feasible. In comparison with fresh solvent, CO₂ sequestration capacity of PD in recycled solvent was reduced by about 26.03 % at the fifth cycle under same mineralization condition.

论文链接：https://doi.org/10.1016/j.seppur.2025.132942