Extensive research has been conducted on the short-term performance of incineration fly ash resource utilization. However, research on the long-term leaching characteristics of heavy metals under external environmental conditions is limited. Therefore, the frost resistance of cement prepared with incineration fly ash as an admixture focused on the leaching characteristics of heavy metals from incineration fly ash and mortar after freeze-thaw were studied by XRD, MIP, SEM, and ICP-MS. The results showed that after 100 freeze-thaw cycles, Cd (HJ 299–2007) in incineration fly ash leached heavy metals exceeding 42.07 % of the GB 18598-2019 limit value. 5 % incineration fly ash enhanced the compressive strength of cement, but exceeding 5 % led to a decrease in compressive strength. After freeze-thaw, incineration fly ash increased the mortar mass loss, strength loss, and porosity. The leaching concentration of heavy metals from incineration fly ash increased under three environment, with the leaching concentration of Ni (HJ 300–2007) after 200 freeze-thaw and the leaching concentration of Cd exceeding 2323.87 % of the limit of GB 16889-2008. Although the concentration of heavy metals in mortar increased with the number of freeze-thaw, the leaching concentration was only 1.73 % of the standard limit, posing no risk of exceeding the limit. Therefore, resource utilization could effectively mitigate the leaching of heavy metals from incineration fly ash under external environmental conditions.

中文翻译：

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焚烧飞灰及其冻融混合料的长期环境安全评价


人们对焚烧飞灰资源化利用的短期表现进行了广泛的研究。然而，对于外部环境条件下重金属的长期淋溶特性的研究还很有限。因此，针对焚烧粉煤灰和砂浆冻融后重金属的浸出特性，采用 XRD、MIP、SEM 和 ICP-MS 研究了焚烧粉煤灰作为外加剂配制的水泥的抗冻性能。结果表明，经过100次冻融循环后，焚烧飞灰中Cd（HJ 299-2007）浸出重金属含量超过GB 18598-2019限量值的42.07%。 5%的焚烧粉煤灰可提高水泥的抗压强度，但超过5%会导致抗压强度下降。冻融后，焚烧飞灰增加了砂浆的质量损失、强度损失和孔隙率。 3种环境下焚烧飞灰中重金属浸出浓度均有所增加，其中Ni（HJ 300-2007）经200次冻融后的浸出浓度和Cd的浸出浓度均超过GB 16889-2008限量值的2323.87%。尽管砂浆中重金属浓度随冻融次数增加而增加，但浸出浓度仅为标准限量的1.73%，不存在超标风险。因此，资源化利用可以有效减轻外部环境条件下焚烧飞灰中重金属的淋失。