Synthesis of green nanomaterial and discussion on its suppression performance and mechanism to aluminum dust explosion

In order to develop a green and efficient nano suppressant for aluminum (Al) dust explosion, MCN with layered structure was synthesized with low-cost urea as precursor via simple calcination technology . The suppression performance of MCN on the flame propagation of 30 μm and 5 μm Al dust with the concentration of 1000 g/m 3 was experimentally studied. Results showed that with the addition of MCN increasing, the flame luminous intensity , flame propagation velocity and fluctuating trend of mixture-Al dust were greatly decreased. After adding 500 g/m 3 and 700 g/m 3 to 30 μm and 5 μm Al dust, the average flame propagation velocities declined by 73.24 % and 94.07 % separately. The minimum inerting concentration of 30 μm and 5 μm Al dust was 600 g/m 3 and 900 g/m 3 . Explosion residuals were analyzed to further reveal the suppression mechanism of MCN in detail. The good performance of MCN provided a potential direction to develop efficient suppressants on the suppression of Al dust explosions to improve process safety.