Long-term leaching (heavy metal ions) behavior of municipal solid waste incineration bottom ash (MSWI BA) is one of the issues limiting its application in alkali activated materials (AAMs). This study investigates NaAlO activated slag (partially replaced by MSWI BA) in terms of the reaction process and leaching behavior. A combined approach of experimental observation and thermodynamic modeling is utilized. The hardened pastes were evaluated by reaction kinetics, mineralogy, microstructure, strength, and leaching. The thermodynamic modeling included consideration of the raw materials chemistry and activator types. Results show that the modeled C(N)−A−S−H is in line with quantitative results. Specifically, modeled hydrotalcite content (3g/100g binder) is slightly higher than the experimental results (2g/100g binder) at 28 days. Furthermore, the uptake of Cu dramatically increases at 20 days by the generated C(N)−A−S−H gels, while the binding capacity of Sb, sulfates, and chlorides increases with the formation of hydrotalcite formation over time.

中文翻译：

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NaAlO2 活化渣和 MSWI 底灰：长期浸出行为的相组合和热力学评估


城市固体废物焚烧底灰（MSWI BA）的长期浸出（重金属离子）行为是限制其在碱活化材料（AAM）中应用的问题之一。本研究从反应过程和浸出行为方面研究了 NaAlO 活化渣（部分被 MSWI BA 替代）。采用实验观察和热力学建模的组合方法。通过反应动力学、矿物学、微观结构、强度和浸出对硬化糊进行评估。热力学建模包括考虑原材料化学和活化剂类型。结果表明，建模的 C(N)−A−S−H 与定量结果一致。具体而言，28天时模拟的水滑石含量（3g/100g粘合剂）略高于实验结果（2g/100g粘合剂）。此外，生成的 C(N)−A−S−H 凝胶对 Cu 的吸收在 20 天时急剧增加，而随着时间的推移，随着水滑石的形成，Sb、硫酸盐和氯化物的结合能力也随之增加。