Inhibition of aluminum powder explosion by sludge-based carbon nanotubes/phosphorus-nitrogen flame retardant composite powder: Mechanism and kinetic model

Reducing or eliminating aluminum powder explosions is of great significance to preventing and reducing aluminum industry disasters. In order to find an appropriate way to prevent and alleviate the hidden danger of aluminum powder explosion, a sludge-based carbon nanotube (MS@CNTs) carrier with excellent performance was constructed in this paper, and the MPP-MS@CNTs composite powder was prepared by in-situ synthesis technology. The explosion flame propagation and pressure suppression experiments show that the composite powder can more effectively suppress the explosion of aluminum powder. When adding 60 wt% composite detonation inhibitor, the explosion inhibition of aluminum powder can be achieved. Combined with the methods of Redfern, Flynn-Wall-Ozawa and Kissinger-AkahiraSunose, it was found that the activation energy of aluminum powder increased after adding detonation inhibitor. Its inhibitory effect is theoretically demonstrated. The material properties before and after the explosion were compared and analyzed through characterization tests. Combined with pyrolysis characteristics, the inhibition mechanism of composite powder mainly includes coating inhibition, porous adsorption isolation, decomposition endothermic, and product oxidation, which provides a theoretical and practical basis for the prevention and control of explosion and fire accidents in the aluminum industry.& COPY; 2023 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.