|
|
Material Sciences 2025
富铁污泥灰的制备及煅烧制度的确立
|
Abstract:
随着全球水泥生产量的不断增加，水泥行业的碳排放量也显著增长，而污水污泥焚烧产生的污泥灰因其含有SiO2、Al2O3、CaO和Fe2O3等成分，被认为具有潜在的火山灰活性，可作为水泥的部分替代材料。本文针对广西某污水处理厂污泥，通过干燥、球磨及不同煅烧条件处理污泥样品，并采用物化分析方法探讨其火山灰活性。实验发现：煅烧温度显著影响污泥灰的比表面积、密度和微观结构，600℃为最佳煅烧温度；保温时间影响活性组分暴露和孔隙结构发展，最佳保温时间为2小时；比表面积的增大提高了污泥灰的反应界面，有利于增强其火山灰活性，但是过高的比表面积会增加需水量。通过优化煅烧制度，可制备性能优良的辅助胶凝材料，有效降低水泥使用量和碳排放。
As global cement production continues to rise, so does the industry’s carbon emissions. Incineration of sewage sludge produces sludge ash containing SiO2, Al2O3, CaO, and Fe2O3, which exhibits pozzolanic activity and can potentially replace a portion of cement. This study examined sludge from a wastewater treatment plant in Guangxi, treating samples via drying, ball milling, and various calcination conditions, followed by physicochemical analysis to assess pozzolanic activity. Key findings include: Calcination temperature significantly influences specific surface area, density, and microstructure, with 600？C identified as the optimal temperature. Holding time affects exposure of reactive components and pore structure, with 2 hours being the ideal duration. Increased specific surface area enhances reaction interfaces, promoting pozzolanic activity; however, excessive surface area increases water demand. Optimizing calcination conditions can produce high-performance supplementary cementitious materials, reducing cement consumption and carbon emissions.
| [1] | Hay, R. and Celik, K. (2022) Assessment of Limestone Calcined Clay Cement (LC3) Produced with Low-Reactivity Kaolinitic Clay and Limestone Powder of Different Finenesses. SSRN Electronic Journal. https://doi.org/10.2139/ssrn.4058198 |
| [2] | Celik, K., Jackson, M.D., Mancio, M., Meral, C., Emwas, A.-H., Mehta, P.K., et al. (2014) High-Volume Natural Volcanic Pozzolan and Limestone Powder as Partial Replacements for Portland Cement in Self-Compacting and Sustainable Concrete. Cement and Concrete Composites, 45, 136-147. https://doi.org/10.1016/j.cemconcomp.2013.09.003 |
| [3] | Celik, K., Meral, C., Petek Gursel, A., Mehta, P.K., Horvath, A. and Monteiro, P.J.M. (2015) Mechanical Properties, Durability, and Life-Cycle Assessment of Self-Consolidating Concrete Mixtures Made with Blended Portland Cements Containing Fly Ash and Limestone Powder. Cement and Concrete Composites, 56, 59-72. https://doi.org/10.1016/j.cemconcomp.2014.11.003 |
| [4] | Belaïd, F. (2022) How Does Concrete and Cement Industry Transformation Contribute to Mitigating Climate Change Challenges? Resources, Conservation & Recycling Advances, 15, Article 200084. https://doi.org/10.1016/j.rcradv.2022.200084 |
| [5] | Benhelal, E., Shamsaei, E. and Rashid, M.I. (2021) Challenges against CO2 Abatement Strategies in Cement Industry: A Review. Journal of Environmental Sciences, 104, 84-101. https://doi.org/10.1016/j.jes.2020.11.020 |
| [6] | Supriya, Chaudhury, R., Sharma, U., Thapliyal, P.C. and Singh, L.P. (2023) Low-CO2 Emission Strategies to Achieve Net Zero Target in Cement Sector. Journal of Cleaner Production, 417, Article 137466. https://doi.org/10.1016/j.jclepro.2023.137466 |
| [7] | Yen, C., Tseng, D. and Lin, T. (2011) Characterization of Eco-Cement Paste Produced from Waste Sludges. Chemosphere, 84, 220-226. https://doi.org/10.1016/j.chemosphere.2011.04.050 |
| [8] | Lin, K.L., Chiang, K.Y. and Lin, C.Y. (2005) Hydration Characteristics of Waste Sludge Ash That Is Reused in Eco-Cement Clinkers. Cement and Concrete Research, 35, 1074-1081. https://doi.org/10.1016/j.cemconres.2004.11.014 |
| [9] | Pan, S., Tseng, D., Lee, C. and Lee, C. (2003) Influence of the Fineness of Sewage Sludge Ash on the Mortar Properties. Cement and Concrete Research, 33, 1749-1754. https://doi.org/10.1016/s0008-8846(03)00165-0 |
| [10] | Liu, M., Zhao, Y., Xiao, Y. and Yu, Z. (2019) Performance of Cement Pastes Containing Sewage Sludge Ash at Elevated Temperatures. Construction and Building Materials, 211, 785-795. https://doi.org/10.1016/j.conbuildmat.2019.03.290 |
| [11] | Xia, Y., Liu, M., Zhao, Y., Chi, X., Guo, J., Du, D., et al. (2023) Hydration Mechanism and Phase Assemblage of Blended Cement with Iron-Rich Sewage Sludge Ash. Journal of Building Engineering, 63, Article 105579. https://doi.org/10.1016/j.jobe.2022.105579 |
| [12] | Rodriguez, C. and Tobon, J.I. (2020) Influence of Calcined Clay/Limestone, Sulfate and Clinker Proportions on Cement Performance. Construction and Building Materials, 251, Article 119050. https://doi.org/10.1016/j.conbuildmat.2020.119050 |
