To solve the problem of poor stability, portability and adhesion of traditional filling materials for regenerated roof coal spontaneous combustion prevention and control, a modified particulate stabilized foam (MSF) w...
To solve the problem of poor stability, portability and adhesion of traditional filling materials for regenerated roof coal spontaneous combustion prevention and control, a modified particulate stabilized foam (MSF) was proposed from the perspective of material modification. By comparing the effects of different surfactants and stabilizers on foaming height and stable time, the optimal ratio of MSF slurry was determined. The formation mechanism of MSF and the influence of microparticle size on foam stability were revealed by microscopic characterization experiments. Finally, the engineering applicability of MSF slurry is verified by field application. The results show that 2.5 g/L AES + 1.5 g/L PAM is the optimal surfactant composite ratio. The most comprehensive performance of MSF was achieved at a microparticle size of 55–65 μm, with a pore size of 350–400 μm, which could effectively penetrate the regenerated roof fracture channels without forming a filter cake. The average contact angle and zeta potential of the microparticles increased in the composite surfactant, and the microparticles were stably adsorbed at the gas-liquid interface of the foam. The plastic viscosity and yield stress of MSF slurries are increased compared to water-based foams. The field application shows that MSF slurry can effectively inhibit coal spontaneous combustion, control the risk of gas, and improve the safe production environment of coal mines
Highlights• The thermal decomposition of fire-extinguishing agent CF3I in high-temperature oxidizing environments was studied by experimental and theoretical methods• The effects of initial concentration, temperature,...
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