Alumina prodn. by the Bayer process - removing organic impurities from the aluminate lye by treatment with lime

Reducing the amt. of org. cpds. in the thick-lye phase of the circulating liq. by adding an excess of C ions, thereby converting the dissolved Na salts of the humic acids and their derivs. to difficulty soluble C salts which are pptd. andremoved by decanting or filtration. In this way, impurities wh...

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Bibliographic Details
Main Authors UERMOESSY, MIKLOS. DR., BUDAPEST, SIKLOSI, PETER. DR, LAZAR, FERENC, SIGMOND, GYOERGY. DR
Format Patent
LanguageEnglish
German
Published 17.10.1974
Edition2
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:Reducing the amt. of org. cpds. in the thick-lye phase of the circulating liq. by adding an excess of C ions, thereby converting the dissolved Na salts of the humic acids and their derivs. to difficulty soluble C salts which are pptd. andremoved by decanting or filtration. In this way, impurities which interfere with the Bayer process are removed The thick-lye phase (i.e. after evapn.) contains 180-280 (pref. 250) g/Na2Ok (formula used for total Na content of the lye, calculated as Na2o). An excess of milk of lime or burnt lime is added as a soln. contg. 2-3 g/l CaO, at 70-90 degrees C and the ppte. removed. Paper-pulp can be added to assist filtration. About 45% of the org. impurities can be removed by this method and the amt, of Al in the ppte. (about 1/3 of the ppte, WT.) is considered insignificant and an improvement on other processs for removing org. contaminants,.
Bibliography:Application Number: DE19742415872