Solid-state reaction kinetics and water corrosion resistance of magnesia-alumina spinel by sinering secondary aluminum dross

Using secondary aluminum dross from the recycled aluminum industry as the main raw material, the preparation of magnesium-aluminum-spinel by sintering secondary aluminum dross was studied. The phase analysis of the material shows that the secondary aluminum dross can be sintered to prepare magnesia alumina spinel. According to the suitable ratio of raw materials, the materials were sintered at different temperatures, and the influence of sintering temperature on the water corrosion resistance of the materials was further discussed. The apparent activation energy of the crystallization reaction is E_a=104.54 kJ/mol. After sintering at 1 200~1 500 ℃ for 3 h, the kinetic equations of the hydration reaction are in the order of (1-(1-5.76η)^1/2)²=kt, (1-(1-6.15η)^1/2)²=kt, (1-(1-6.43η)^1/2)²=kt and (1-(1-6.34η)^1/2)²=kt. After sintering at 1 400 ℃ for 3 h, the hydration rate of the material is 8.83%, which is still far from the standard of a high water resistance material (0.2%).