二次铝灰烧制镁铝尖晶石固相反应动力学及材料耐水蚀性能

以再生铝行业二次铝灰为主要原料，开展二次铝灰烧结制备镁铝尖晶石材料的研究。材料物相分析表明:二次铝灰可以烧结制备镁铝尖晶石材料。根据适宜的原料配比，在不同温度条件下烧结制备材料，进一步探讨烧结温度对材料耐水蚀性能的影响。二次铝灰烧结制备镁铝尖晶石材料的晶化反应表观活化能E_a=104.54 kJ/mol。在1 200~1 500 ℃烧结3 h，材料水化反应动力学方程依次为:（1-（1-5.76η）1/2）2=kt，（1-（1-6.15η）1/2）2=kt，（1-（1-6.43η）1/2）2=kt和（1-（1-6.34η）1/2）2=kt；1 400 ℃烧结3 h，材料水化率为8.83%，达不到高耐水性材料标准（0.2%）要求。 

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%).