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水泥窑共处置过程中水泥生料对Pb与Cd的吸附/冷凝特性

丛 璟 闫大海 李 丽 蒋旭光 周英男 王 琪 彭 政

丛 璟, 闫大海, 李 丽, 蒋旭光, 周英男, 王 琪, 彭 政. 水泥窑共处置过程中水泥生料对Pb与Cd的吸附/冷凝特性[J]. 环境科学研究, 2015, 28(4): 575-581.
引用本文: 丛 璟, 闫大海, 李 丽, 蒋旭光, 周英男, 王 琪, 彭 政. 水泥窑共处置过程中水泥生料对Pb与Cd的吸附/冷凝特性[J]. 环境科学研究, 2015, 28(4): 575-581.
CONG Jing, YAN Dahai, LI Li, JIANG Xuguang, ZHOU Yingnan, WANG Qi, PENG Zheng. Research on Condensation and Absorption Characteristics of Cement Raw Meal for Pb and Cd during Co-Processing in Cement Kilns[J]. Research of Environmental Sciences, 2015, 28(4): 575-581.
Citation: CONG Jing, YAN Dahai, LI Li, JIANG Xuguang, ZHOU Yingnan, WANG Qi, PENG Zheng. Research on Condensation and Absorption Characteristics of Cement Raw Meal for Pb and Cd during Co-Processing in Cement Kilns[J]. Research of Environmental Sciences, 2015, 28(4): 575-581.

水泥窑共处置过程中水泥生料对Pb与Cd的吸附/冷凝特性

基金项目: 国家环境保护公益性行业科研专项(201209023);中挪合作“中国危险废物与工业废物水泥窑无害化管理项目”(CHN215009/059)

Research on Condensation and Absorption Characteristics of Cement Raw Meal for Pb and Cd during Co-Processing in Cement Kilns

  • 摘要: 为了研究水泥窑共处置过程中水泥生料对Pb、Cd的吸附/冷凝特性,采用氮吸附仪和SEM(场发射扫描电镜)对水泥生料的基本物理性质(比表面积、孔径和微观表面积)进行研究;同时,利用小型试验装置对重金属Pb、Cd的氧化物(PbO、CdO)展开了吸附/冷凝研究. 结果表明:水泥生料的比表面积(2.49 m2/g)较小,微观表面结构致密无孔,因此,在水泥窑共处置过程中水泥生料对重金属的吸附/冷凝作用以冷凝为主. 进入控温立式炉的重金属可分为三部分:①冷凝在管壁上,其中Pb、Cd分别占各自入炉总量的67%~72%、58%~65%;②吸附/冷凝在水泥生料上,其中Pb、Cd分别占各自入炉总量的13%~17%、16%~21%;③随烟气释放到空气中,其中Pb、Cd分别占各自入炉总量的10%~18%、14%~26%. 水泥生料对Pb、Cd的吸附/冷凝特性均可用双常数方程拟合,线性拟合的相关系数均在0.95以上. 动力学方程拟合得到水泥生料对Pb、Cd的吸附/冷凝活化能,二者分别为5.827、6.050 kJ/mol,由此可预测水泥生料对Pb和Cd的吸附/冷凝量.

     

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  • 刊出日期:  2015-04-25

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