Process for the preparation of alumina

277,697. Seailles, J. C. Sept. 18, 1926, [Convention date]. Alkaline earth and sodium aluminates, alumina.-A hydrated alkaline earth aluminate is prepared by treating a mixture of pulverised non- halogenated ore of aluminium with an alkaline earth base in the presence of hot or cold water under norm...

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Bibliographic Details
Main Author SEAILLES JEAN CHARLES
Format Patent
LanguageEnglish
Published 03.05.1932
Subjects
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
INORGANIC CHEMISTRY
METALLURGY
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Summary:277,697. Seailles, J. C. Sept. 18, 1926, [Convention date]. Alkaline earth and sodium aluminates, alumina.-A hydrated alkaline earth aluminate is prepared by treating a mixture of pulverised non- halogenated ore of aluminium with an alkaline earth base in the presence of hot or cold water under normal pressure or in a digester, and is converted to sodium aluminate by the addition of sodium carbonate or sulphate. Alumina is prepared from the sodium aluminate by a known process, e.g. precipitation by carbon dioxide. If the alkaline earth aluminate is soluble e.g. barium aluminate, it is filtered and the barium precipitated directly by a hot or cold solution of sodium carbonate or sulphate; or it may be first precipitated by lime as calcium aluminate and then so treated, that barium hydroxide is recovered. If the ore contains combined alumina, it is first calcined. The barium, calcium, magnesium or strontium hydroxide is present preferably in from one to two molecular proportions to the alumina.
Bibliography:Application Number: US19270219168