Xu Xin, Jiang Jian-guo, Chen Mao-zhe, Luo Manr, Zhang Yan, Du Xue-juan
Department of Environment Science and Engineering, Tsinghua University, Beijing 100084, China.
Huan Jing Ke Xue. 2007 Jul;28(7):1644-8.
The sequestration of CO2 and carbonation process for the stabilization of fresh fly ash from municipal solid waste (MSW) incinerator were investigated. The purpose of this paper is to evaluate the influence of fundamental parameters affecting the stabilization of heavy metal of Pb and diffusivity and reactivity of CO2 (i. e. the water content and concentration of CO2). In addition, the major physical and chemical changes in fly ash after carbonation were investigated using XRD and SEM. It shows that 10% or more water content added to fly ash could remarkably accelerate the sequestration of CO2, compared with control samples without water. The sequestration of CO2 is not remarkable within 1 day in the air atmosphere for low content of CO2 (0.03%). The XRD analysis indicates that CO2 could combine Ca(OH)2 to form CaCO3 and CO2 could also combine heavy metal oxides to form heavy metal carbonate (i.e. from PbO4 to PbCO3). Aggregates of crystals of sheet and cylinder can be observed by SEM.
研究了城市固体废物（MSW）焚烧炉新鲜飞灰的二氧化碳封存及碳酸化过程以实现其稳定化。本文旨在评估影响铅重金属稳定化以及二氧化碳扩散率和反应性的基本参数（即含水量和二氧化碳浓度）的影响。此外，使用X射线衍射（XRD）和扫描电子显微镜（SEM）研究了碳酸化后飞灰的主要物理和化学变化。结果表明，与无水的对照样品相比，向飞灰中添加10%或更多的水可显著加速二氧化碳的封存。对于低含量的二氧化碳（0.03%），在空气气氛中1天内二氧化碳的封存并不显著。XRD分析表明，二氧化碳可与氢氧化钙结合形成碳酸钙，二氧化碳还可与重金属氧化物结合形成重金属碳酸盐（即从四氧化铅到碳酸铅）。通过SEM可观察到片状和柱状晶体的聚集体。
