Effect of the MgO/SiO2 ratio on MgO–silica binders solidifying MSWI fly ash

Waste Disposal & Sustainable Energy Pub Date : 2023-09-27 DOI:10.1007/s42768-023-00164-0

Yin Duan, Xiaobo Liu, Zeinab Khalid, Xuguang Jiang

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Abstract

To improve the effect of MgO–SiO₂ binders solidifying municipal solid waste incineration fly ash (MSWI FA), MSWI FA solidified bodies with five MgO/SiO₂ ratios (0.41 ~ 3.77) were investigated. The leaching behavior of solidified bodies was evaluated by leaching toxicity tests and pH-dependent experiments. In addition, hydration products in solidified bodies were analyzed by thermodynamic modeling and microstructure characterizations. The results showed that the variation in the MgO/SiO₂ ratio had a significant effect on the leaching toxicity of the solidified bodies, because it affected the leachate pH and the composition of the hydration products of the solidified bodies. The acid and alkali resistance of the MSWI FA was enhanced through solidification with MgO–SiO₂ binders. MgO can improve the alkalinity of the solidified bodies and facilitate the chemical precipitation of heavy metals. Moreover, silica fume, an industrial waste, can serve as a cost-effective measure. Overall, MgO–SiO₂ binders demonstrated great potential as promising candidates for encapsulating MSWI FA.

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氧化镁/二氧化硅比率对凝固 MSWI 粉煤灰的氧化镁-二氧化硅粘结剂的影响

为了改善氧化镁-二氧化硅粘结剂固化城市固体废物焚烧飞灰（MSWI FA）的效果，研究了五种氧化镁/二氧化硅比率（0.41 ~ 3.77）的 MSWI FA 固化体。通过浸出毒性试验和 pH 依赖性实验对固化体的浸出行为进行了评估。此外，还通过热力学模型和微观结构特征分析了固化体中的水化产物。结果表明，氧化镁/二氧化硅比例的变化对固化体的浸出毒性有显著影响，因为它影响了浸出液的 pH 值和固化体水合产物的成分。通过使用 MgO-SiO2 粘合剂固化，MSWI FA 的耐酸碱性得到了增强。氧化镁可以提高固化体的碱度，促进重金属的化学沉淀。此外，硅灰是一种工业废料，可以作为一种具有成本效益的措施。总之，氧化镁-二氧化硅粘合剂作为封装 MSWI FA 的候选材料具有巨大潜力。

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Waste Disposal & Sustainable Energy

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