Method for producing alpha-alumina powder

Details Method for producing alpha-alumina powder Method for producing alpha-alumina powder

C - Chemistry, Metallurgy

01

F

C01F 7/04 (2006.01) C01F 7/02 (2006.01) C01F 7/44 (2006.01)

Patent

CA 2136582

Alpha alumina powder having a regulated particle size, a uniform particle shape and a narrow particle size distribution and further a low halogen content is produced by calcining at least one starting material selected from transition alumina and alumina compounds in a halogen-containing atmosphere which comprises a hydrogen halide gas, a halogen gas or a mixture of a halogen gas and steam and contains at least 0.1 % by volume of at least one halogen- containing gas selected from the group consisting of hydrogen halide gas and halogen gas, and removing halogen from a calcined material. The produced alpha-alumina powder is excellent in a packing property and homogeneously packed.

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