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通过热重实验对含铁粉尘碳酸化反应动力学进行了研究,建立了碳酸化反应的未反应收缩核模型,分析了反应温度对反应控制阶段动力学特性参数的影响规律.结果表明,提高反应温度有利于碳酸化球团的转化;碳酸化反应温度由400℃升高到600℃时,CaO转化率明显增大,800℃达到最大;碳酸化反应的总速率受到内扩散和界面化学反应共同控制,反应前期化学反应为限制环节,反应速率较快,反应后期内扩散为限制环节,反应速率变慢;在200～800℃的反应活化能为11.091kJ/mol.
The kinetics of carbonation reaction of iron-containing dust was studied by TG experiment, and the unreacted contracting core model of carbonation reaction was established, and the influence of reaction temperature on the kinetic parameters of the reaction control phase was analyzed. The results showed that increasing the reaction rate The temperature is favorable for the conversion of carbonated pellets. When the temperature of carbonation increases from 400 ℃ to 600 ℃, the conversion of CaO increases obviously and reaches the maximum at 800 ℃. The total rate of carbonation reaction is controlled by internal diffusion and interfacial chemical reaction The chemical reaction in the pre-reaction stage was the limiting stage, the reaction rate was faster, the diffusion was the limiting stage in the late reaction stage, and the reaction rate became slower. The reaction activation energy at 200-800 ℃ was 11.091kJ / mol.