In order to solve the disposal problem of municipal solid waste incineration bottom ash sludge (MSWI‐BAS) and decrease the energy consumption and environmental pollution of lightweight aggregates (LWAs) prepared by traditional sintering methods, nonsintered LWA were produced with MSWI‐BAS. The effects of different curing time and additives on the performance of LWA were studied. Results showed that the LWA after 28 days of curing has the best physical properties: compressive strength 1.50 MPa, 1 hr water absorption 35%, and particle density 868 kg/m³. When the MSWI‐BAS content is 64%, the granules have the highest particle strength and particle density, reaching 2 MPa and 860 kg/m³, respectively. Ca²⁺ and SO₄²⁻ disintegrated from CaSO₄·2H₂O interact with the skeleton of LWA to produce silica‐alumina gel materials, which are beneficial to strength. The sodium silicate mainly acts as a binder to promote the reaction of Ca²⁺ and Al³⁺ in the reaction system to produce C‐S‐H gels, which increase the density and strength. This innovative technology using MSWI‐BAS to produce high performance and nonsintered LWA is fully compliant with the requirements of clean production and sustainable development.

中文翻译：

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废泥产生的非烧结轻质骨料及其特性受添加剂的影响

为了解决城市固体废物焚烧底灰污泥（MSWI‐BAS）的处置问题，并减少传统烧结方法制备的轻质骨料（LWA）的能耗和环境污染，使用MSWI‐BAS生产了未烧结的LWA。研究了不同固化时间和添加剂对LWA性能的影响。结果表明，固化28天后的LWA具有最佳的物理性能：抗压强度1.50 MPa，1小时吸水率35％，颗粒密度868 kg / m ³。当MSWI-BAS含量为64％时，颗粒的颗粒强度和颗粒密度最高，分别达到2 MPa和860 kg / m ³。Ca ²⁺和SO ₄ ²⁻从CaSO ₄ ·2H ₂ O中分解出来的LWA与LWA的骨架相互作用，生成二氧化硅-氧化铝凝胶材料，这对强度很有帮助。硅酸钠主要用作粘合剂，以促进反应体系中Ca ²⁺和Al ³⁺的反应生成C‐S‐H凝胶，从而增加密度和强度。这项采用MSWI-BAS的创新技术可生产高性能且未烧结的LWA，完全符合清洁生产和可持续发展的要求。