Mechanistic study on the utilisation and mineral formation of incineration fly ash in sintering

Fly ash, a significant byproduct of municipal solid waste incineration, garners attention for its harmless treatment and resource utilisation. Existing research has demonstrated the viability of incorporating fly ash into the sintering process and explored its influence on the sintering bonding phase. In the context of co-disposal of municipal solid waste incineration residues through sintering, it is imperative to consider the mineralisation characteristics, necessitating a comprehensive evaluation of sinter strength and metallurgical performance. In this investigation, the process is validated on an expanded scale using sintering cup experiments. The results indicate that the experimental group with a basicity of 2 and the inclusion of fly ash exhibits sinter strength in line with actual production requirements, its drop index is 76.03%, and its drum index is 77.2%. Additionally, the reduction velocity index is recorded at 0.573% min −1 , the reduction degradation index for RDI +3.15 at 92% and the total characteristic value of melting properties ( S) at 99.175 KPa·°C—nearly equivalent to the control group with matching alkali conditions. The technology roadmap was verified by sintering cup experiment, offering vital theoretical support for the development of sintering process in the collaborative treatment of incineration fly ash.