To identify a superior explosion suppressant for Al-Mg alloy dust explosion, the inhibition effects of Al(OH)₃ and Mg(OH)₂ powders on Al-Mg alloy explosion were investigated. A flame propagation suppression experiment was carried out using a modified Hartmann tube experimental system, an explosion pressure suppression experiment was carried out using a 20-L spherical explosion experimental system, and the suppression mechanisms of the two kinds of powders on Al-Mg alloy dust explosion were further investigated. The results demonstrate that by increasing the mass percentages of Al(OH)₃ and Mg(OH)₂, the flame height, flame propagation speed and explosion pressure of deflagration can be effectively reduced. When 80% Mg(OH)₂ powder was added, the explosion pressure was reduced to less than 0.1 MPa, and the explosion was restrained. Due to the strong polarity of the surface of Mg(OH)₂, agglomeration easily occurs; hence, when the added quantity is small, the inhibition effect is weaker than that of Al(OH)₃. Because the Mg(OH)₂ decomposition temperature is higher, the same quantity absorbs more heat and exhibits stronger adsorption of free radicals. Therefore, to fully suppress Al-Mg alloy explosion, the suppression effect of Mg(OH)₂ powder is better.

为了确定一种用于Al-Mg合金粉尘爆炸的优良防爆剂，研究了Al（OH）₃和Mg（OH）₂粉末对Al-Mg合金爆炸的抑制作用。使用改进的Hartmann管实验系统进行火焰传播抑制实验，使用20 L球形爆炸实验系统进行爆炸压力抑制实验，以及两种粉末对Al-Mg合金粉尘的抑制机理爆炸进行了进一步调查。结果表明，通过提高Al（OH）₃和Mg（OH）₂的质量百分比，可以有效降低爆燃的火焰高度，火焰传播速度和爆炸压力。当80％Mg（OH）₂添加粉末，将爆炸压力降低至小于0.1MPa，并抑制爆炸。由于Mg（OH）₂的表面具有很强的极性，因此很容易发生团聚。因此，添加量少时，抑制效果比Al（OH）₃弱。由于Mg（OH）_2的分解温度较高，因此相同量的热量会吸收更多的热量，并表现出更强的自由基吸附能力。因此，为了充分抑制Al-Mg合金爆炸，Mg（OH）₂粉末的抑制效果更好。