Preparation of lightweight ceramsite from municipal solid waste incineration ash and tuff: Constrained uniform mixture design, thermodynamic simulation and formation mechanism
IF 7.4 1区 工程技术Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Xinyuan Zhan , Dongshuai Zhang , Jin Wang , Yuqi Luo , Zhengbo Yue
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引用次数: 0
Abstract
Municipal solid waste incineration (MSWI) ash (fly ash and bottom ash) contains considerable heavy metals and dioxins, which must be disposed of. Inspired by “zero solid waste” MSWI plant, fly ash and bottom ash were co-thermal treated into a low-aluminum-silicon lightweight ceramsite with the assistance of tuff. The formula of 34.09 % bottom ash, 23.02 % fly ash and 42.89 % tuff was attained by the constrained uniform mixture design, and the resulting ceramsite fulfilled the specifications required for Lytag commercial lightweight aggregate. Thermodynamic simulation, SEM-EDS, FTIR and XRD were conducted to reveal the roasting mechanism of low-aluminum-silicon lightweight ceramsite with four stages. The leaching toxicity of ceramsite was less than limited values of hazardous waste leaching standard, especially for Pb. Heavy metals (Cr, Ni, Cu, Zn, Cd and Pb) primarily engaged in Ca-bearing minerals, leading to the formation of hybrid minerals and the impregnation of amorphous phases ([SiO₄]/[AlO₄] polymers). Therefore, lightweight ceramsite preparation from fly ash and bottom ash achieves the goal of “zero solid waste” MSWI plant.
期刊介绍:
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.