FIELD: production of inorganic compounds. SUBSTANCE: starting alumina material selected from group including transient aluminum oxide and aluminum oxide compound is granulated to form particles that are then calcined in halogen-containing atmosphere (gaseous hydrogen halide, gaseous halogen, or halogen-steam mixture) containing at least 0.1 vol % of at least one halogen-containing gas. EFFECT: enabled production of alpha- alumina with controlled particle size and shape, showing narrow size distribution of particles and containing small proportion of agglomerated particles. 13 cl, 2 dwg, 1 tbl, 30 ex
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