Abstract Among various kinds of methods for the stabilization of heavy metals in municipal solid waste incineration fly ash (MSWI FA), acid leaching is the most prevalent. However, the process of heavy metals leaching in MSWI FA by various acids must be compared. In this study, we extracted the heavy metals in MSWI FA using 0.5 M solutions of strong acids (HCl, H2SO4 and HNO3), as well as weak acids (NH4Cl, (NH4)2SO4 and NH4NO3). Solidification by CO2 injection occurred in all the leaching solutions. The leaching test was performed for solids such as treated MSWI FA and the precipitates produced in the solidification process, compared with untreated MSWI FA. The solids were analyzed by using X-Ray fluorescence spectroscopy, X-Ray diffraction, and scanning electron microscopy. The leaching solutions were analyzed by inductively coupled plasma-optical emission spectroscopy. Using weak acid solutions, Zn, Pb, and Cu were leached 15–70 times, two times, and 20–150 times, respectively, more than those leached strong acids. Except H2SO4 and (NH4)2SO4 solutions, all the acids reduced the mass of MSWI FA and extracted heavy metals. The crystalline precipitates were the carbonates. HNO3 solution was found to be the most appropriate solvent for the proposed method.

中文翻译：

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使用各种弱酸通过 CO2 吸收程序稳定城市固体废物焚烧飞灰中的重金属

摘要 在各种城市生活垃圾焚烧飞灰（MSWI FA）中重金属的稳定化方法中，酸浸法最为普遍。然而，必须比较各种酸在 MSWI FA 中浸出重金属的过程。在本研究中，我们使用 0.5 M 强酸（HCl、H2SO4 和 HNO3）溶液以及弱酸（NH4Cl、(NH4)2SO4 和 NH4NO3）溶液提取 MSWI FA 中的重金属。所有浸出液均发生 CO2 注入固化。与未处理的 MSWI FA 相比，对固体（例如处理过的 MSWI FA 和固化过程中产生的沉淀物）进行了浸出试验。通过使用 X 射线荧光光谱、X 射线衍射和扫描电子显微镜分析固体。通过电感耦合等离子体-光发射光谱分析浸出溶液。使用弱酸溶液，锌、铅和铜的浸出量分别比强酸浸出量多 15-70 倍、2 倍和 20-150 倍。除 H2SO4 和 (NH4)2SO4 溶液外，所有酸都降低了 MSWI FA 的质量并提取了重金属。结晶沉淀物是碳酸盐。发现 HNO3 溶液是该方法最合适的溶剂。