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钢渣碳酸化是一种CO_2矿化利用的有效方法。通过添加低浓度碱,可有效提高钢渣碳酸化转化效率。围绕低浓度碱介质中钢渣碳酸化过程,系统研究了搅拌转速、低浓度碱浓度、反应温度等工艺条件对钢渣碳酸化转化效率的影响。在搅拌转速为450 r/min,碱浓度为20 g/L,反应温度为70℃等优化工艺条件下可实现钢渣碳酸化转化效率为49.72%,是传统水介质体系的1.8倍以上,且反应条件温和,介质可循环利用。进一步开展了钢渣碳酸化反应动力学研究,结果表明钢渣碳酸化反应为内扩散控制,计算得到表观活化能为22.48 k J/mol。
Slag carbonation is an effective method for CO 2 mineralization. By adding a low concentration of alkali, can effectively improve the slag carbonation conversion efficiency. Aiming at the process of carbonation of steel slag in low concentration alkali medium, the effects of stirring speed, alkali concentration at low concentration and reaction temperature on the carbonation conversion efficiency of steel slag were systematically investigated. The carbonization conversion efficiency of steel slag was 49.72%, which was 1.8 times higher than that of traditional aqueous medium under the optimum conditions of stirring speed of 450 r / min, alkali concentration of 20 g / L and reaction temperature of 70 ℃, and the reaction Mild conditions, the media can be recycled. Further studies on the kinetics of slag carbonation were carried out. The results showed that the carbonation reaction of slag was controlled by internal diffusion. The calculated activation energy was 22.48 kJ / mol.