Manufacture of calcined alumina with crystallite size...

C - Chemistry – Metallurgy – 01 – F

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C01F 7/44 (2006.01) C04B 35/111 (2006.01)

Patent

CA 2270582

The invention concerns a method for manufacturing alumina for ceramics by calcination of alumina trihydrate in the presence of a mineralising agent such as a halogenated compound and/or a boron compound, said calcined alumina being constituted of friable conglomerates of elemental particles or alpha alumina crystallite the size of which is adjusted on request with a confined unimodal distribution of the crystallite size. The invention is characterised in that the calcination in industrial furnace, in renewed oxidising atmosphere, of the alumina trihydrate filler at a temperature between 800 DEG C and 1300 DEG C for half an hour to four hours is carried out simultaneously in the presence of a halogenated compound acting as mineralising agent and a recrystallisation modifier of alumina, with a silica base, evenly and closely distributed in the alumina trihydrate filler.

L'invention concerne un procédé de fabrication d'alumine pour céramique par calcination de trihydrate d'alumine en présence d'un minéralisant tel qu'un composé halogéné et/ou un composé du bore, ladite alumine calcinée étant constituée d'agglomérats friables de particules élémentaires ou cristallite d'alumine alpha dont la taille moyenne est réglée à la demande avec une distribution unimodale resserrée des tailles de cristallite caractérisé en ce que la calcination en four industriel, sous atmosphère oxydante renouvelée, de la charge de trihydrate d'alumine à une température comprise entre 800°C et 1300°C pendant une durée de 1/2 heure à 4 heures est effectuée en présence simultanément d'un composé halogéné faisant office de minéralisant et d'un modificateur de recristallisation de l'alumine, à base de silice, uniformément et intimement réparti dans la charge de trihydrate d'alumine.

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