Investigation of the Sequestration of CO2 and Carbonation Process for the Stabilization of MSW Fly Ash
加速碳酸化技术对城市垃圾焚烧飞灰重金属稳定性影响研究

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 Pb3O4 to PbCO3). Aggregates of crystals of sheet and cylinder can be observed by SEM.