以拜耳法赤泥为CO2固化剂,研究了不同压力下赤泥对CO2的固化封存能力,以及固化CO2过程中矿物物相的化学转化行为.探讨了温度、液固比、粒径、时间等因素对赤泥固化CO2效率的影响以及赤泥固化CO2过程Na、K的浸出特性变化.结果表明,CO2压力为0.6 MPa、1 MPa、1.6 MPa时,赤泥固化CO2的饱和增重率分别达到2.36％、2.70％、3.07％.随反应时间的变化,赤泥浆液的pH值不断下降,最后稳定在6.40左右.液固比减小,赤泥粒径减小,在2060℃之间温度升高,有助于赤泥固化CO2效率的提高.赤泥固化CO2后Na、K的浸出量增加.XRD和红外光谱分析显示赤泥固化CO2后主要形成的矿物相是钙霞石(cancrinite)和方解石(CaCO3).不同压力下赤泥对CO2的固化反应符合准一级动力学方程.
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