Abstract: Magnesium aluminate spinel material was prepared by solid reaction with low-grade magnesite and industrial alumina ash as raw materials.The effect of sintering temperature on composition and microstructure of industrial alumina ash was discussed firstly.For further study，the effects of sintering temperature on composition，crystal cell parameters，and microstructure of magnesium aluminate spinel material were studied.Crystalline phases and microstructure of the sintered sample were determined by XRD and SEM respectively.The lattice parameters of main crystalline phase and crystallinity of the samples sintered at different temperatures were calculated and compared by X′Pert plus software.Results showed that lattice parameters of hexagonal corundum that is main crystalline phase in the industrial alumina ash presented a nonisotropic variation tendency with the increase of sintering temperature.Magnesium aluminate spinel material could be prepared by solid reaction of low-grade magnesite and industrial alumina ash at 1 400 ℃.The cell parameter of main crystalline phase of the magnesium aluminate spinel material prepared at this temperature reached maximum，and relatively well-distributed grains in the material and relatively compact microstructure were both observed.

Key words: low-grade magnesite, industrial alumina ash, magnesium aluminate spinel, solid-state reaction