Lime mud, a kind of industrial waste that produced in paper mill, was proposed as CO₂ sorbent in calcium looping process. The carbonation performance of the lime mud was investigated in a dual‐fixed bed reactor (DFR) and a thermogravimetric analyzer (TGA). The carbonation kinetics of the lime mud in the chemical reaction controlled stage was analyzed by a surface reaction‐controlled kinetic model. The results show that the lime mud presents much poorer carbonation performance during the chemical reaction controlled stage compared with the limestone, mainly due to the high content of chlorine in the lime mud. A prewash treatment process was used to decrease the chlorine content to mitigate the sintering of the lime mud when calcined at high temperature. After prewash treatment, the prewashed lime mud shows much higher CO₂ capture capacity during the chemical reaction controlled stage compared with the lime mud. A prolonged carbonation process successfully further enhances the microstructure and improves the carbonation performance of the prewashed lime mud in the chemical reaction controlled stage. The lime mud can be effectively used as CO₂ sorbent in calcium looping process after prewash treatment and the following prolonged carbonation treatment.

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钙循环过程中造纸厂石灰泥CO2捕集能力的动力学分析

造纸厂产生的一种工业废料石灰泥被提议作为CO _2。钙环化过程中的吸附剂。在双固定床反应器（DFR）和热重分析仪（TGA）中研究了石灰泥的碳酸化性能。通过表面反应控制的动力学模型分析了在化学反应控制阶段的石灰泥的碳酸化动力学。结果表明，与石灰石相比，在化学反应控制阶段，石灰泥的碳酸化性能要差得多，这主要是由于石灰泥中的氯含量很高。预洗处理工艺用于降低氯含量，以减轻高温煅烧时石灰泥的烧结。经过预洗后，预洗的石灰泥显示出更高的CO ₂与石灰泥相比，在化学反应控制阶段的捕集能力。延长的碳化过程可成功地进一步增强化学反应控制阶段中预洗石灰泥的微观结构并改善其碳化性能。在预洗处理和随后的长时间碳化处理之后，石灰泥可有效地用作钙环化过程中的CO ₂吸附剂。