The high alkalinity, chlorine, and potentially toxic elements (PTEs) content of municipal solid waste incineration fly ash (MSWI FA) hindered its potential application in construction materials. This study proposed the recovery of MSWI FA via wet carbonation and developed a novel sustainable carbonated-MSWI FA-based binder. Experimental results showed that MSWI FA achieved 12 wt% CO2 capture through wet carbonation. Besides, wet carbonation removed 82 % of chlorine from MSWI FA and reduced the leaching risk of PTEs in both pretreatment leachate and carbonated-MSWI FA. The designed sustainable paste exhibited an outstanding 28-day compressive strength of 45.6 MPa. The chloride and sulfate salts in the carbonated-MSWI FA played an important role in hydration kinetics of pastes. Sulfate in carbonated-MSWI FA reacted with aluminate to form ettringite, and the residual chloride was captured by CO3-Cl-AFm. The proposed wet carbonation route provided a promising and sustainable way for CO2 capture and facilitating the application of MSWI FA in construction materials.

中文翻译：

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MSWI 粉煤灰的湿法碳化用于可持续石灰石煅烧粘土水泥型复合材料


城市固体废物焚烧飞灰 （MSWI FA） 的高碱度、氯和潜在有毒元素 （PTE） 含量阻碍了其在建筑材料中的潜在应用。本研究提出了通过湿法碳化法回收 MSWI FA，并开发了一种新型可持续的碳酸盐 MSWI FA 基粘合剂。实验结果表明，MSWI FA 通过湿法碳化实现了 12 wt% 的 CO2 捕获。此外，湿碳化从 MSWI FA 中去除了 82% 的氯，并降低了预处理渗滤液和碳酸 MSWI FA 中 PTE 的浸出风险。设计的可持续浆料表现出出色的 28 天抗压强度，达到 45.6 MPa。碳酸 MSWI FA 中的氯盐和硫酸盐在浆体的水化动力学中起重要作用。碳酸盐-MSWI FA 中的硫酸盐与铝酸盐反应生成钙矾石，残留的氯化物被 CO3-Cl-AFm 捕获。拟议的湿式碳化路线为 CO2 捕获提供了一种有前途且可持续的方式，并促进了 MSWI FA 在建筑材料中的应用。