Process for desilication of aluminate liquors in the production of alumina
CA 1210569 A · Owner: Vsesojuzny Nauchno-Issledovatelsky I Proektny Institut Aljuminievoi, Magnievoi I Elektrodnoi Promyshlennosti · Inventors: Kaluzhsky, Nikolai A.; Alexeev, Alexei I.; Badaliants, Khoren A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A b s t r a c t The process consists of two desilication stages. In the first stage the aluminate liquor resulting from digestion of the sinter is subjected to an autoclave treatment to remove the major portion of impurities of SiO2 and Fe2O3. In the second stage the aluminate liquor is treated with a desilication agent comprising a lime pulp containing axides CaO, Al2O3, SiO2 Fe2O3, Na2O in, a mass ratio of CaO: (SiO2+Fe2O3) = 1,000 to 5,000:1 and Na2O:Al2O3 = 0.25-0.60:1, wherein CaO is active Na20 - in, the carbonate form. This lime pulp is employed in such an amount as to ensure the content of active CaO in the aluminate liquor within the range of from 5 to 10 g/l. The impurities of …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
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- Granted September 2, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 2, 2003.
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