A METHOD FOR THE PREPARATION OF ALUMINA

A method for the preparation of alumina, the method comprising the steps of, treating aluminous material to reduce particle size and increase the alumina content, calcining the aluminous material, leaching the aluminous material with hydrochloric acid, solid liquid separation to provide a pregnant l...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Liu, Jingyuan, Tan, Ignatius Kim Seng
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS FERROUS OR NON-FERROUS ALLOYS INORGANIC CHEMISTRY METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A method for the preparation of alumina, the method comprising the steps of, treating aluminous material to reduce particle size and increase the alumina content, calcining the aluminous material, leaching the aluminous material with hydrochloric acid, solid liquid separation to provide a pregnant liquor, crystallising aluminium chloride hexahydrate by adding hydrogen chloride gas, precipitating aluminium chloride hexahydrate and separating the aluminium chloride hexahydrate, dissolving the aluminium chloride hexahydrate in water and repeating the crystallisation process at least once, calcining aluminium chloride hexahydrate to provide alumina and finishing the alumina to either a bead or alumina powder.