Wet carbonation potential of Mg- and Al-bearing calcium silicate clinker phases

IF 8.6 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization Pub Date : 2026-01-01 Epub Date: 2025-12-03 DOI:10.1016/j.jcou.2025.103288

Sophia Villmow , Anika Mielkau , Maciej Zajac , Jürgen Neubauer

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Abstract

In this study, the carbonation behavior of Ca-Mg/Al silicates was investigated in a specially designed wet reactor. The Mg/Al-rich phases studied represent a diverse group of materials, whose carbonation kinetics depend on their chemical composition and crystal structure. The reactions of synthetic akermanite (C₂MS₂), bredigite (C₇MS₄), merwinite (C₃MS₂), and gehlenite (C₂AS) were monitored through continuous pH and temperature measurements, while data on the CO₂ uptake, the dissolution and precipitation of hydrates, and carbonation products were measured by quantitative X-ray diffraction (QXRD) and thermogravimetric analysis (TGA). Under the given conditions, the Ca-Mg silicates exhibited a degree of reaction above 80 % within just three hours. In contrast, the Ca-Al silicate gehlenite showed little to no carbonation potential. Characteristic carbonation and hydration products include CaCO₃ (ACc, calcite, aragonite), (Ca,Mg)CO₃, and amorphous SiO₂ gels.

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含镁和含铝硅酸钙熟料相的湿碳化势

在一个专门设计的湿式反应器中，研究了Ca-Mg/Al硅酸盐的碳化行为。所研究的富Mg/ al相代表了一组不同的材料，其碳化动力学取决于它们的化学组成和晶体结构。通过连续的pH和温度测量来监测合成阿角长石（C2MS2）、辉长石（C7MS4）、墨长石（C3MS2）和辉长石（C2AS）的反应，并通过定量x射线衍射（QXRD）和热重分析（TGA）测量CO2吸收、水合物溶解和沉淀以及碳化产物的数据。在给定的条件下，Ca-Mg硅酸盐在3小时内的反应度达到80 %以上。相比之下，钙铝硅酸盐辉长岩几乎没有碳酸化潜力。典型的碳酸化和水化产物包括CaCO₃（ACc、方解石、文石）、（Ca、Mg）CO₃和无定形SiO2凝胶。

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来源期刊

Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL

CiteScore

13.90

自引率

10.40%

发文量

406

审稿时长

2.8 months

期刊介绍： The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.