Process for producing .alpha.-alumina

Details Process for producing .alpha.-alumina Process for producing .alpha.-alumina

C - Chemistry, Metallurgy

01

F

C01F 7/44 (2006.01) C01F 7/02 (2006.01) C30B 25/00 (2006.01) C30B 29/20 (2006.01)

Patent

CA 2137247

ABSTRACT OF THE DISCLOSURE A process for producing .alpha.-alumina comprising .alpha.-alumina single crystal particles characterized in that transition alumina and/or an alumina raw material capable of being converted to transition alumina on heating is calcined in an atmosphere containing at least 1% by volume of hydrogen chloride at a temperature of not less than 600°C, preferably from 600 to 1,400°C, and more preferably from 800 to 1,200°C. Aluminum hydroxide, alum, aluminum sulfate, etc. are used as the alumina raw material capable of being converted to transition alumina on heating. .alpha.-Alumina comprising octahedral or higher polyhedral .alpha.-alumina single crystal particles which have a high alumina purity above a given level, are fine and homogeneous, have a narrow particle size distribution, and are not agglomerated particles can be obtained from raw materials of various kinds, purities, shapes, sizes, and compositions. - 34 -

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