Jianguo Jiang, Maozhe Chen, Yan Zhang, Xin Xu
Department of Environment Science and Engineering, Tsinghua University, Beijing 100084, PR China.
J Hazard Mater. 2009 Jan 30;161(2-3):1046-51. doi: 10.1016/j.jhazmat.2008.04.051. Epub 2008 Apr 22.
Carbonation technology with CO(2) absorption was used to enhance the stabilization of heavy metals in fresh fly ash from a municipal solid waste incinerator (MSWI). The influence of fundamental parameters affecting the stabilization of heavy metals, especially Pb and diffusivity and reactivity of CO(2), was evaluated. The results indicated that the addition of 10% or more of water could remarkably accelerate the absorption of CO(2) and could also accelerate the stabilization of MSWI fly ash. The stabilization of MSWI fly ash is not distinct within 1d in the air atmosphere for low content of CO(2) (0.03%). The result of the XRD analysis indicated that CO(2) could combine with Ca(OH)(2) to form CaCO(3) and CO(2) could also combine with heavy metal oxide to form heavy metal carbonate in the adsorption of CO(2). The TGA analysis showed that MSWI fly ash has the sequestration capability of 3% (w/w) CO(2). The sequestration of CO(2) has a large impact on Pb, and the exchangeable Pb can be converted into carbonated form in rich CO(2) condition to be stabilized.
采用CO₂吸收碳化技术提高城市固体废弃物焚烧炉（MSWI）新鲜飞灰中重金属的稳定性。评估了影响重金属稳定性的基本参数的影响，特别是Pb以及CO₂的扩散率和反应性。结果表明，添加10%或更多的水可显著加速CO₂的吸收，也能加速MSWI飞灰的稳定化。对于低含量CO₂（0.03%），在空气气氛中1天内MSWI飞灰的稳定化不明显。XRD分析结果表明，在CO₂吸附过程中，CO₂可与Ca(OH)₂结合形成CaCO₃，CO₂还可与重金属氧化物结合形成重金属碳酸盐。TGA分析表明，MSWI飞灰具有3%（w/w）的CO₂封存能力。CO₂的封存对Pb有很大影响，在富CO₂条件下，可交换态Pb可转化为碳酸盐形式而被稳定化。
