EIG (UPV/EHU), Plaza Europa 1, 20018 Donostia-San Sebastián, Spain.
Institute of Construction Science Eduardo Torroja, Serrano Galvache, s/n, 28033 Madrid, Spain.
Waste Manag. 2021 Feb 1;120:114-124. doi: 10.1016/j.wasman.2020.11.034. Epub 2020 Dec 7.
Municipal solid waste incinerator (MSWI) fly ash is a residue of municipal solid waste incineration whose recycling is currently a worldwide problem. Therefore, considerable efforts are being made to establish effective recovery techniques so MSWI can be used as a substitute for natural resources in construction, as in masonry blocks, roads and so on, or in the manufacture of new materials. MSWI fly ashes contain elements such as Ca, Si and Al, which make it possible for them to be used as raw material to manufacture cements. This paper presents the results obtained from the physicochemical characterization of two MSWI fly ashes from two Spanish cities. The research aims to explore the feasibility of using MSWI fly ash as raw material for sintering belite cements. The results show that MSWI fly ashes have a suitable composition. However, appropriate pre-treatment will be required to eliminate chloride and possible traces of heavy metals and to improve pozzolanic activity. Furthermore, the addition of vitreous silica in the proper proportions is required. The phases generated after calcination of the blend at 800 °C are not those corresponding to pure belite cements. Nevertheless, the possibility of using these ashes as supplementary cementitious material in the manufacture of eco-cements should be contemplated.
城市生活垃圾焚烧炉（MSWI）飞灰是城市生活垃圾焚烧的残余物，其回收利用目前是一个全球性的问题。因此，人们正在努力建立有效的回收技术，以便将 MSWI 用作建筑中的天然资源替代品，如砌体砌块、道路等，或用于制造新材料。MSWI 飞灰含有 Ca、Si 和 Al 等元素，这使得它们可以用作制造水泥的原料。本文介绍了对来自西班牙两个城市的两种 MSWI 飞灰进行物理化学特性研究的结果。该研究旨在探索将 MSWI 飞灰用作烧结贝利特水泥原料的可行性。结果表明，MSWI 飞灰具有适宜的组成。然而，需要进行适当的预处理，以消除氯和可能的痕量重金属，并提高火山灰活性。此外，还需要添加适量的玻璃体硅砂。在 800°C 下煅烧混合物后生成的相不是对应于纯贝利特水泥的相。然而，应该考虑将这些灰烬用作生态水泥制造中的辅助胶凝材料。
