Preliminary assessment of calcium extraction reagents for indirect carbonation

Carbon Capture Science & Technology Pub Date : 2025-06-26 DOI:10.1016/j.ccst.2025.100463

Zian Tang , Yuanrui Song , Xingyu Zhu , Bingyang He , Wenyu Li , Lingling Zhang

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Abstract

The "indirect carbonation" technique accelerates carbonation in hydroxides, slags, or cementitious materials using calcium extraction reagents (CERs), thereby facilitating carbon capture. However, selecting the optimal reagent is often time-consuming. To streamline this, we developed a chemical equilibrium-based evaluation method to assess CER effectiveness. This method considers pH, Ca-complex stability constants, ligand concentration, and solubility product constants, providing a concentration-based or dimensionless evaluation index. To validated the method, we conducted carbonation tests using six different ligands and compared their practical acceleration performance on Ca(OH)₂, steel slag, and cement with the calculated outcomes. Our findings show that the method accurately predicts CER performance in simple systems like Ca(OH)₂ and qualitatively evaluates CERs in more complex systems like steel slag and cement. Additionally, we created a user-friendly program to assist in CER evaluation, simplifying the pre-screening process.

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间接碳酸化钙提取试剂的初步评价

“间接碳化”技术使用钙提取试剂（CERs）加速氢氧化物、炉渣或胶凝材料中的碳化，从而促进碳捕获。然而，选择最佳试剂往往是费时的。为了简化这一过程，我们开发了一种基于化学平衡的评估方法来评估CER的有效性。该方法考虑了pH、ca络合物稳定性常数、配体浓度和溶解度产物常数，提供了基于浓度或无因次的评价指标。为了验证该方法，我们使用六种不同的配体进行了碳化试验，并将它们在Ca(OH)2、钢渣和水泥上的实际加速性能与计算结果进行了比较。我们的研究结果表明，该方法准确地预测了Ca(OH)2等简单体系中的CER性能，并定性地评估了钢渣和水泥等更复杂体系中的CER。此外，我们还创建了一个用户友好的程序来协助CER评估，简化了预筛选过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Carbon Capture Science & Technology

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