Single-step CO₂ absorption and mineralisation not only fulfills the advantage of rapid CO₂ absorption of amines but also allows the in-situ CO₂ mineralisation and amine regeneration. However, the technical feasibility of this process with various amine types has not been fully investigated. The mechanisms of amine promoted carbonation in this process was also unclear. In this study, the CO₂ absorption, mineralisation and carbonate crystallisation at different monoethanolamine (MEA) concentrations, calcium hydroxide (Ca(OH)₂) concentrations, temperatures, and amine types were systematically investigated. The dissolution experiments of Ca(OH)₂ in MEA solutions with various concentrations and protonated ratio were carried out to explore the mechanisms of amine promoted carbonation. To further demonstrate the practical feasibility of this process for CO₂ removal from realistic gas streams, the CO₂ removal efficiencies from artificial biogas and the amine loss in CaCO₃ products were determined. We found that the increased MEA and Ca(OH)₂ concentrations can not only contribute to CO₂ absorption but also affect the crystal sizes and shapes of calcium carbonate (CaCO₃) products, which provided the possibility for precise product control. MEA could enhance the dissolution of Ca(OH)₂ and calcium leaching, leading to the improved carbonation. Under the optimized conditions (0.5 M amine, 1.0 M Ca(OH)₂, and 55 °C temperature), piperazine (PZ) was the most suggested promotor as it provided the highest CaCO₃ purity (87 %), CO₂ removal efficiency (98 %), diverse crystal sizes and shapes, and nearly zero amine loss in CaCO₃ products.

一步法CO ₂吸收矿化不仅实现了胺快速吸收CO ₂的优点，而且可以原位CO ₂矿化和胺再生。然而，该方法使用各种胺类型的技术可行性尚未得到充分研究。在这个过程中胺促进碳酸化的机制也不清楚。在这项研究中，系统地研究了不同单乙醇胺 (MEA) 浓度、氢氧化钙 (Ca(OH) ₂ ) 浓度、温度和胺类型下的 CO ₂吸收、矿化和碳酸盐结晶。Ca(OH) ₂的溶解实验在不同浓度和质子化率的 MEA 溶液中进行了研究，以探索胺促进碳酸化的机制。为了进一步证明该方法从实际气流中去除CO ₂的实际可行性，确定了人工沼气中的 CO ₂去除效率和 CaCO ₃产品中的胺损失。我们发现，增加的 MEA 和 Ca(OH) ₂浓度不仅有助于 CO ₂吸收，而且会影响碳酸钙 (CaCO ₃ ) 产品的晶体尺寸和形状，这为精确控制产品提供了可能。MEA可以增强Ca(OH) ₂的溶解和钙浸出，导致改善的碳酸化。在优化条件下（0.5 M 胺、1.0 M Ca(OH) ₂和 55 °C 温度），哌嗪 (PZ) 是最推荐的促进剂，因为它提供了最高的 CaCO ₃纯度 (87 %)、CO ₂去除效率(98 %)、不同的晶体尺寸和形状，以及 CaCO ₃产品中的胺损失几乎为零。