Laboratory of Solid Waste Disposal Engineering, Graduate School of Engineering, Hokkaido University, Kita 13, Nishi 8, Sapporo 060-8628, Japan.
J Environ Manage. 2012 Nov 15;110:207-14. doi: 10.1016/j.jenvman.2012.06.010. Epub 2012 Jul 11.
This study investigated the effect of the chemical composition of incineration fly ash on the leaching characteristics of Pb from melting furnace fly ash generated by melting incineration fly ash. Melting furnace fly ash from both a real-scale melting process and lab-scale melting experiments was analyzed. In addition, the theoretical behavior of Cl that affects the leaching characteristics of Pb was simulated by a thermodynamic equilibrium calculation. Proportions of water-soluble Pb in the melting furnace fly ash were correlated with equivalent ratios of total Pb in the ash and Cl transferred to gas. The amount of Cl in the gas increased with an increase in the molar ratio of Cl to Na and K in the incineration fly ash. The thermodynamic calculation predicted that HCl generation is promoted by the increase in the molar ratio, and X-ray photoelectron spectroscopy indicated a possible presence of PbCl(2) in the melting furnace fly ash. These results implied that the formation of water-soluble PbCl(2) with HCl was affected by the relationships among the amounts of Na, K, and Cl in the incineration fly ash. This is highly significant in determining the leaching characteristics of Pb from the melting furnace fly ash.
本研究探讨了焚烧飞灰化学成分对熔融炉飞灰浸出特性的影响，该熔融炉飞灰是由焚烧飞灰熔融产生的。对实际规模熔融过程和实验室规模熔融实验产生的熔融炉飞灰进行了分析。此外，通过热力学平衡计算模拟了影响 Pb 浸出特性的 Cl 的理论行为。熔融炉飞灰中水溶性 Pb 的比例与灰中总 Pb 和转移到气体中的 Cl 的当量比相关。随着焚烧飞灰中 Cl 与 Na 和 K 的摩尔比增加，气体中的 Cl 量增加。热力学计算预测，随着摩尔比的增加，HCl 的生成会得到促进，X 射线光电子能谱表明熔融炉飞灰中可能存在 PbCl2。这些结果表明，与焚烧飞灰中 Na、K 和 Cl 的含量有关的水溶性 PbCl2 的形成受到 HCl 的影响。这对于确定熔融炉飞灰中 Pb 的浸出特性具有重要意义。
