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Application filed by Vni Proek I Alum Elek PromyfiledCriticalVni Proek I Alum Elek Promy
Priority to PT7623583ApriorityCriticalpatent/PT76235A/en
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Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals
(AREA)
Abstract
The process comprises wetting of limestone, and Na2O+K2O/Al2O3 of less than 1.0 molar ratio, with recycle soln. contg. carbonic acid and sodium and potassium salts, for sintering, lixiviation, desilication of the resulting soln., carbonation, and calcining of the resulting aluminium hydroxide. This is followed by evapn. of 30-90 vol.% of the soln. produced by carbonation. The remaining 10-70% of the soln. is used to form the wetting soln., through intermediate carbonation with 5-68 g of carbon dioxide in soln. per litre of the wetting soln..
PT7623583A1983-02-141983-02-14Process for preparing alumina
PT76235A
(en)
Process for the spontaneous precipitation of sulfates dissolved in water as calcium aluminium sulfate and the application of this process for the preparation of low-chloride gypsum-anhydrite containing aluminium oxide