Abstract: To address the frequent fires in the transportation and storage of silica mud in recent years, and the lack of effective fire extinguishing methods, this study employed a laboratory-level silica mud stack fire extinguishing test model to evaluate the feasibility of using water to extinguish silica mud stack fires, investigate the effects of extinguishing water with different pH values on the fire-fighting efficiency of silica mud stack fires, and compare the effects of water and foam extinguishing agents on silica mud stack fire-fighting effectiveness. The results show that it is technically feasible to use acidic and neutral water to extinguish silica mud stack fires, while using alkaline water to extinguish fires will lead to a sharp increase in the stack fire, which poses high risk; the lower the pH value of the fire extinguishing water, the better the cooling and fire extinguishing effects; AFFF foam has a good cooling and fire extinguishing effect on the surface of the stack, but has a poor cooling effect on the inside of the stack.

Key words: silicon mud, stack fire, pH, aqueous film-forming foam