DE3241582

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 temperatur...

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Main Authors TOTH, GEB. HOEMOESTREI, MARIA, MATYASI, JOZSEF.. DR, KOEKENY, BELA.. DR., KOMAROM, HU, ZSEMBERY, LASZLO.. DR, TOTH, JOZSEF., ALMASFUEZITOE-FELSOE, HU, KAPTAY, GYOERGY-METALLURGE, PENZES, IMRE-MASCH.., ALMASFUEZITOE-FELSOE, HU
Format Patent
LanguageEnglish
Published 25.07.1991
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
CONCRETE
INORGANIC CHEMISTRY
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Summary: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 Na2O 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.
Bibliography:Application Number: DE19823241582