In this paper, we performed an experimental study on how to maximize CO₂ storage, produce high purity CaCO₃, and control the morphology of CaCO₃ in the process of indirect carbonation using paper sludge ash (PSA) and chelating agents as solvents. To this end, the effects of the Ca-Ligand (Ca-L) stability constant and concentration of chelating agents on the Ca extraction efficiency, carbonation efficiency, and the characteristics of CaCO₃ produced were investigated. For the study, a total of seven chelating agents (fumarate, adipate, malonate, IDA, citrate, NTA, and EDTA) in a wide range of Ca-L stability constant (Log K) of 2.0–12.4 were adopted, and the concentrations of each chelating agent were adjusted to 0.1 and 0.5 M. According to the experimental results, it was revealed that the storage of CO₂ and the yield, purity, and morphology of CaCO₃ could be controlled by adjusting the type (or Ca-L stability constant) and concentration of the chelating agent. The higher the Ca-L stability constant and concentration of the chelating agent, the higher the Ca extraction efficiency, but the lower the carbonation efficiency. The highest CO₂ storage and CaCO₃ production were obtained by using citrate with a Log K value of 4.7.

在本文中，我们进行了一项实验研究，研究如何在使用纸污泥灰分（PSA）和螯合剂作为溶剂的间接碳酸化过程中最大程度地增加CO _2的储存，产生高纯度的CaCO ₃以及控制CaCO ₃的形态。为此，Ca-配体（Ca-L）稳定常数和螯合剂浓度对Ca提取效率，碳化效率和CaCO ₃特性的影响生产的被调查。在研究中，总共采用了7种螯合剂（富马酸盐，己二酸盐，丙二酸盐，IDA，柠檬酸盐，NTA和EDTA），其Ca-L稳定常数（Log K）为2.0-12.4。每种螯合剂的含量分别调整为0.1 M和0.5M。根据实验结果表明，通过调整类型（或Ca-L）可以控制CO ₂的储存以及CaCO ₃的产率，纯度和形态。稳定常数）和螯合剂的浓度。Ca-L稳定常数和螯合剂的浓度越高，Ca的提取效率越高，但碳酸化效率越低。最高的CO ₂储存量和CaCO ₃ 通过使用Log K值为4.7的柠檬酸盐获得产量。