College of Materials Science and Engineering, Xi'an University of Architecture & Technology, Xi'an, 710055, Shaanxi, China.
College of Materials Science and Engineering, Xi'an University of Architecture & Technology, Xi'an, 710055, Shaanxi, China; State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Cryospheric Science and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China.
J Environ Manage. 2024 Dec;371:123168. doi: 10.1016/j.jenvman.2024.123168. Epub 2024 Nov 4.
Municipal solid waste incineration fly ash (raw ash) can be used as an admixture, but it contains much toxic substances and has a negative effect on cement performance. Co-sintering technology has the potential to solve the above problems. When Municipal solid waste incineration fly ash and fly ash from coal-fired power plants were co-sintering, the effects on the properties of incineration fly ash and used as an admixture was studied. The results showed that co-sintering increased the pozzolanic activity of municipal solid waste incineration fly ash by more than 80%, significantly increased the decomposition rate of chlorides and dioxins, and increased the amount of admixture from 1.58% of the raw ash to 11.11% of the sintered ash. When used as an admixture, the cement prepared with sintered ash reduced fineness (when the dosage was 20%, from 13.61% of the raw ash to 8.89% of the sintered ash), reduced water requirement (when the dosage was 20%, from 33.68% of the raw ash to 26.67% of the sintered ash), and increased compressive strength compared to the cement prepared with the raw ash. When the dosage was 5%, it has the highest compressive strength, which was 35.1 MPa and 53.2 MPa at 3 d and 28 d, respectively. Co-sintering with fly ash from coal-fired power plants reduced the toxicity of municipal solid waste incineration fly ash, enhanced its resource utilization in cement, and provided new ideas for the disposal and recycling of hazardous solid waste.
城市生活垃圾焚烧飞灰（原状灰）可用作掺合料，但其中含有较多的有毒物质，对水泥性能有负面影响。共烧结技术有解决上述问题的潜力。当城市生活垃圾焚烧飞灰与燃煤电厂粉煤灰共烧结时，研究了其对焚烧飞灰性能和用作掺合料的影响。结果表明，共烧结可使城市生活垃圾焚烧飞灰的火山灰活性提高 80%以上，显著提高氯化物和二恶英的分解率，使掺合料的掺量从原状灰的 1.58%增加到烧结灰的 11.11%。用作掺合料时，用烧结灰制备的水泥细度降低（当掺量为 20%时，由原状灰的 13.61%降低至烧结灰的 8.89%），需水量降低（当掺量为 20%时，由原状灰的 33.68%降低至烧结灰的 26.67%），与用原状灰制备的水泥相比，抗压强度提高。当掺量为 5%时，抗压强度最高，分别为 3d 和 28d 时的 35.1MPa 和 53.2MPa。与燃煤电厂粉煤灰共烧结降低了城市生活垃圾焚烧飞灰的毒性，增强了其在水泥中的资源化利用，为危险固体废物的处置和回收提供了新的思路。
