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以煤系高岭土酸处理除铝后剩余的物料为硅源,与Li2CO3通过高温固相反应合成了可在高温直接吸收CO2的硅酸锂材料。采用扫描电子显微镜(SEM)、X射线粉末衍射仪(XRD)分别观察和分析了所合成材料的表面形貌与结构特征,并使用差热-热重联用分析仪(DTA-TG)研究了硅酸锂材料吸收CO2的性能。实验结果表明,该材料具有较好的吸收CO2性能,吸收量可达31.07%(质量分数)。与以市售SiO2为硅源制取的硅酸锂相比,低温时高岭土-硅酸锂具有更快的吸收速率,具有明显的低温吸收CO2优势。
Treated with coal-based kaolin acid, the remaining material after aluminum removal is silicon source, and Li2CO3 is synthesized by high-temperature solid-state reaction and can directly absorb CO2 at high temperature. The surface morphology and structural characteristics of the synthesized materials were observed and analyzed by scanning electron microscopy (SEM) and X-ray powder diffraction (XRD), respectively. The surface morphology and structure of the synthesized materials were investigated by DTA-TG Lithium silicate absorbs CO2. The experimental results show that the material has good CO2 absorption capacity up to 31.07% (mass fraction). Compared with lithium silicate prepared from commercially available SiO2 as a silicon source, kaolin-lithium silicate has a faster absorption rate at low temperature and has the obvious advantage of CO2 absorption at low temperature.