Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1982-11-09
1984-10-16
Niebling, John F.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
423625, C01F 730, C01F 702
Patent
active
044774273
ABSTRACT:
Process for the preparation of alkali-poor .alpha.-alumina for ceramic purposes. Technical grade aluminum hydroxide is activated and calcinated in the presence of a mineralizing mixture comprising halides and boron compounds. The process further comprises activating aluminum hydroxide at a temperature of 500-600 degrees C., washing the activated product with alkali-free water containing calcium ions and having a conductivity not exceeding 70 .mu.S/cm until the alkali content expressed in Na.sub.2 O becomes lower than 0.15% by weight, adding 0.4-0.7% by weight of a mineralizing mixture to the washed product, and calcinating the same at a temperature of 1200-1350 degrees C.
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patent: 4045234 (1977-08-01), Ring
patent: 4374119 (1983-02-01), Schepers et al.
Gwyra, B. et al., "The Coarsening of Bayer Alumina Trihydrate by Means of Crystallization Modifiers", Powder Technology, 11 No. 2, (1975), pp. 101-105.
Kaptay Gyorgy
Kokeny Bela
Matyasi Jozsef
Penzes Imre
Toth Jozsef T.
Boggs, Jr. B J.
Magyar Aluminiumipari Troeszt
Niebling John F.
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