Process for the production of electrofusion corundum

Details Process for the production of electrofusion corundum Process for the production of electrofusion corundum

C - Chemistry, Metallurgy

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C01F 7/02 (2006.01) C01F 7/46 (2006.01) C04B 35/107 (2006.01) C09K 3/14 (2006.01)

Patent

CA 1107938

ABSTRACT OF THE DISCLOSURE: High-purity .alpha.-electrocorundum is produced by heating alumina having an alkali content of between 0.05 and 0.60 weight percent and an A12O3 content of more than 95 weight percent, in admixture with SiO2 in an electric arc furnace at a temperatu- re sufficient to form a melt thereof, cooling the melt whereby to form a composition comprising an .alpha.-corundum phase in a sili- ceous matrix and thereafter separating the siliceous matrix from the .alpha.-corundum phase. The process of the invention enables normal, commercially available aluminas with comparatively high alkali contents to be used. The corundun manufactured by this process possesses an improved surface activity and has an .alpha.-A12O3 content of more than 99.8% by weight.

293609

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