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利用热天平对富氧气氛下CaCO3煅烧产物碳酸化特性进行了实验研究,分析发现,温度是决定碳酸化反应速率快慢及最终转化率高低的关键因素,在一定的温度范围内,随着温度的升高,碳酸化反应速率加快,最终转化率提高。同时发现,CO2浓度增加可加快化学反应阶段速率,但最终转化率相差不大。对CaO活化能的计算,采用了分阶段计算。不同CO2浓度的活化能相差不大,而且产物层控制阶段的活化能都比化学反应控制阶段的活化能大很多。
The use of thermobalance on carbonation characteristics of CaCO3 calcined in oxygen-enriched atmosphere was studied. The results showed that temperature was the key factor that determines the carbonation reaction rate and the final conversion rate. Under certain temperature range, Increased carbonation reaction rate, the final conversion rate increased. It was also found that the increase of CO2 concentration can speed up the chemical reaction stage, but the final conversion rate is not big difference. Calculate the activation energy of CaO, using a phased calculation. The activation energies of different CO2 concentrations are similar, and the activation energy in the control phase of the product layer is much larger than the activation energy of the chemical reaction control phase.