用赤泥捕集二氧化碳

以拜耳法生产氧化铝产生的赤泥为捕集剂，对CO₂进行捕集，考察了液固比、反应温度、搅拌速率、CO₂流量对单位CO₂捕集量（以每克赤泥捕集的CO₂质量计）和赤泥脱碱率（以钠去除率计）的影响。实验结果表明：在液固比为7#x02236;1、反应温度为30℃、搅拌转速为500r/min、CO₂流量为200mL/min的最佳实验条件下，最大单位CO₂捕集量为0.0263g/g，赤泥的脱碱率可达到42.43%。赤泥具有较强的捕集CO₂的能力，因此，利用固体废弃物赤泥吸收工业废气中的CO₂可以达到以废治废的目的。

Capture of Carbon Dioxide with Red Mud

CO₂ was captured using the red mud in alumina production by Bayer process as capture agent. The factors affecting the unit CO₂ capture capacity (calculated in the mass of CO₂ captured by 1 g red mud) and the alkali removal rate from the red mud (calculated in Na removal rate) were studied. The experimental results show that：under the optimum conditions of liquid-solid ratio 7#x02236;1,reaction temperature 30 ℃,stirring rate 500 r/min and CO₂ flow 200 mL/min,the largest unit CO₂ capture capacity is 0.026 3 g/g, the alkali removal rate of the red mud can reach 42.43%. It indicates that the CO₂ capture capability of the red mud is strong and can be used in the capture of CO₂ in industrial waste gas.