Fu Binbin, Wang Chaoran, Wang Dan
State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China.
College of Materials Science and Engineering, Hainan University, Haikou 570228, China.
Materials (Basel). 2025 May 12;18(10):2232. doi: 10.3390/ma18102232.
This study investigates the impact of different temperatures and initial Mg/Ca molar ratios in the solution on the wet-accelerated carbonation of β-dicalcium silicate (β-CS). The x-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), and field emission scanning electron microscopy (FE-SEM) analysis results indicated that temperature and the Mg/Ca molar ratio are key factors in the nucleation of aragonite. Aragonite formed at a temperature above 60 °C, and the high temperature promoted the crystallinity of needle-like aragonite with a length of 1-6 μm and a diameter of ~1 μm. Moreover, 80 °C was the most favorable temperature for the formation of aragonite with a large aspect ratio in the carbonation system of β-CS. Mg had a significant effect on inhibiting the transformation of aragonite to calcite and promoting the stability of aragonite. Aragonite became the dominant CaCO polymorph instead of calcite when the Mg/Ca molar ratio was above 1.0, and pure aragonite-style calcium carbonate was formed at a Mg/Ca molar ratio of 1.5.
本研究考察了溶液中不同温度和初始镁钙摩尔比对β-硅酸二钙（β-CS）湿加速碳酸化的影响。X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、热重分析仪（TGA）和场发射扫描电子显微镜（FE-SEM）分析结果表明，温度和镁钙摩尔比是文石成核的关键因素。文石在60℃以上的温度下形成，高温促进了长度为1-6μm、直径约为1μm的针状文石的结晶度。此外，80℃是β-CS碳酸化体系中形成高长径比文石的最有利温度。镁对抑制文石向方解石的转变和促进文石的稳定性有显著影响。当镁钙摩尔比高于1.0时，文石成为主要的碳酸钙多晶型物而非方解石，且在镁钙摩尔比为1.5时形成了纯文石型碳酸钙。
