Alpha-alumina and method for producing the same

Details Alpha-alumina and method for producing the same Alpha-alumina and method for producing the same

C - Chemistry, Metallurgy

01

F

C01F 7/46 (2006.01) C01F 7/44 (2006.01)

Patent

CA 2169891

A powdery .alpha.-alumina having an alumina purity of at least 99.8-wt. %, a sodium content of 40 ppm or less and an iron content of 20 ppm or less, which is obtained by grinding aluminum hydroxide which is produced by the Bayer process or a transition alumina which is obtained by precalcining aluminum hydroxide produced by the Bayer process, and calcining the aluminum hydroxide or transition alumina in an atmosphere containing 1 vol. % or more of a hydrogen chloride gas, or an atmosphere containing 1 vol. % or more of a chlorine gas and 0.1 vol. % or more of steam, at a temperature of 600 to 1400°C.

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