February 14, 2026JOM0 citations
View Full PaperFire Suppression Mechanism of All-Solid-Waste Grouting Material for Preventing Self-Ignition of Coal Gangue Mountains
Key Points
- The research aims to develop an eco-friendly grouting material for preventing self-ignition of coal gangue.
- Developed a grouting material using circulating fluidized bed fly ash, red mud, and steel slag.
- Investigated the effect of water-to-binder ratio and curing temperature on material properties.
- Performed microstructural analysis to assess material characteristics.
- Achieved optimal fluidity (> 200 mm) with a water-to-binder ratio of 0.6.
- Material demonstrated a > 95% encapsulation rate in diffusion tests.
- Rapidly cooled high-temperature coal from 305°C to 54.1°C within 60 min with no re-ignition.
Abstract
Spontaneous combustion of coal gangue hills causes severe environmental pollution, necessitating highly efficient and eco-friendly grouting materials for fire suppression. This study developed a fully solid-waste-based grouting material with high fluidity and thermal resistance using circulating fluidized bed fly ash (CFBFA), red mud (RM), and steel slag (SS) as raw materials, with carbide slag (CS) as the alkali activator. By investigating the effects of the water-to-binder ratio (0.6–0.8) and curing temperature (20–80°C), we found that a ratio of 0.6 provided the optimal balance of high fluidity (> 200 mm), low precipitation rate ( 95% encapsulation rate in cold-state diffusion tests and exhibited exceptional fire-extinguishing performance in thermal tests, rapidly cooling high-temperature coal (305°C) to 54.1°C within 60 min with no re-ignition after 300 min.