关键词:

生活垃圾焚烧飞灰')">"> 生活垃圾焚烧飞灰, 赤泥, 熔融处理, 协同处置, 灰熔融性

Abstract:

This study systematically investigates the feasibility of co-melting municipal solid waste incineration (MSWI) fly ash with red mud and its synergistic effects on heavy metal immobilization. Through comprehensive characterization of the chemical composition, co-melting behavior, and detailed analysis of the resultant phases and leaching toxicity, we evaluated the effects of high-temperature co-melting treatment on both melting temperature reduction and heavy metal stabilization. The experimental results demonstrate that the co-melting process significantly reduces the flow temperature from above 1500°C to approximately 1250°C, while simultaneously optimizing the melting kinetics of fly ash. Mineralogical analysis reveals that the primary crystalline phases in the molten products are complex silicate minerals, including Alinite, Wadalite, and double perovskite structures. Leaching tests, conducted in accordance with standard protocols, indicate exceptional immobilization efficiency for most heavy metals, with all detected concentrations well below the regulatory thresholds. These findings collectively suggest that the co-melting treatment of MSWI fly ash with red mud represents an innovative and effective approach for waste management, providing a promising pathway for the resource utilization of waste incineration fly ash to achieve "waste treatment with waste".

Key words: fly ash')">

fly ash, Melting treatment, red mud, collaborative disposal, ash melting point