C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/239
C01F 7/04 (2006.01)
Patent
CA 1210569
PROCESS FOR DESILICATION OF ALUMIMATE LIQUORS IN THE PRODUCTION OF ALUMINA 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 alu- minate liquor within the range of from 5 to 10 g/l. The impurities of SiO2 and Fe2O3 present in the liquor pass into the solid phase with the formation of calcium hydro- garnets of the formula 3 CaO(Al,Fe)2O3 mSiO2(6-2m)H2O. wherein m = 0.01-0.5 which are separated as a mud.
448175
Alexeev Alexei I.
Andreev Vladimir V.
Badaliants Khoren A.
Kaluzhsky Nikolai A.
Korneev Valentin I.
Leningradsky Tekhnologichesky Institut Imeni Lensoveta
Ogilvy Renault
Vsesojuzny Nauchno-Issledovatelsky I. Proektny Institut Aljumini Mag Nievoi I. Elektrodnoi Promyshlennosti
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