Abstract: The wire-mesh basket experiment was used to study the spontaneous combustion characteristics， the critical conditions of spontaneous combustion and the temporal and spatial distribution of temperature in the oxidation process of polished aluminum powder. According to the Frank-Kamenetskii(F-K)theory， the difference method and the cross-point temperature method were used to analyze the experimental data， calculate the oxidation reaction kinetic parameters and extrapolate the experimental results， and predict the minimum spontaneous combustion critical temperature at the industrial site accumulation scale. The research results show that the oxidation process of polished aluminum powder conforms to the Arrhenius kinetic mechanism， and the reaction activation energy is 105.4kJ/mol. The critical temperature of aluminum powder is 215.5℃ when the small size baskets are stacked in the laboratory. When the stacking size is increased to the size of the dust collecting bucket on the industrial site， the critical temperature drops to 129℃. The research results can provide a theoretical reference for the prevention and control of spontaneous combustion disasters during the production， storage and transportation processes of aluminum powder.

Key words: polished aluminum powder; spontaneous combustion; critical condition; activation energy; wire-mesh basket experiment