Abstract: The preparation key of periclase-manganese aluminate spinel bricks for the cement kiln firing zone is the synthesis of manganese aluminate spinel.Manganese aluminate spinel (MnAl₂O₄) was synthesized at 1 550 and 1 600 ℃ for 3 h,using MnO,MnO₂ and MnCO₃ as manganese sources and α-Al₂O₃ and Al(OH)₃ as aluminum sources.The effects of different manganese and aluminum sources on the properties of manganese aluminate spinel were investigated.The results show that:(1)compared with MnO₂ and MnCO₃,manganese aluminate spinel synthesized with MnO as the manganese source has the higher synthesis rate,lower apparent porosity,higher bulk density,larger grain size of 50 μm and denser structure;(2)compared with Al(OH)₃,manganese aluminate spinel synthesized with α-Al₂O₃ as the aluminum source has less cracks,lower apparent porosity and denser structure.Therefore,dense manganese aluminate spinel with high purity and good crystal development was synthesized by sintering at 1 600 ℃ with α-Al₂O₃ as the aluminum source and MnO as the manganese source.

Key words: manganese aluminate spinel, manganese source, aluminum source, MnO, α-Al₂O₃

摘要： 水泥窑烧成带用方镁石-锰铝尖晶石砖制备的关键是锰铝尖晶石的合成,分别以MnO、MnO₂、MnCO₃为锰源,α-Al₂O₃、Al(OH)₃为铝源,按照理论组成配料,经混合、成型、干燥后,在1 550、1 600 ℃保温3 h合成了锰铝尖晶石,研究了不同锰源和铝源对合成锰铝尖晶石性能的影响。结果表明:1)相比MnO₂和 MnCO₃,以MnO为锰源合成锰铝尖晶石的合成率较高,显气孔率较低,体积密度较高,晶粒尺寸更大,达到 50 μm,结构致密。2)相比Al(OH)₃,以α-Al₂O₃为铝源合成的锰铝尖晶石裂纹更少,显气孔率更低,结构更致密。因此,以α-Al₂O₃为铝源,以MnO为锰源,经1 600 ℃烧结合成了纯度较高、晶体发育良好的致密锰铝尖晶石。

关键词: 锰铝尖晶石, 锰源, 铝源, MnO, α-Al₂O₃