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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Hauptverfasser:	UERMOESSY, MIKLOS. DR., BUDAPEST, SIKLOSI, PETER. DR, LAZAR, FERENC, SIGMOND, GYOERGY. DR
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	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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creator	UERMOESSY, MIKLOS. DR., BUDAPEST SIKLOSI, PETER. DR LAZAR, FERENC SIGMOND, GYOERGY. DR
description	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,.
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DR</creatorcontrib><creatorcontrib>LAZAR, FERENC</creatorcontrib><creatorcontrib>SIGMOND, GYOERGY. DR</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>UERMOESSY, MIKLOS. DR., BUDAPEST</au><au>SIKLOSI, PETER. DR</au><au>LAZAR, FERENC</au><au>SIGMOND, GYOERGY. DR</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Alumina prodn. by the Bayer process - removing organic impurities from the aluminate lye by treatment with lime</title><date>1974-10-17</date><risdate>1974</risdate><abstract>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,.</abstract><edition>2</edition><oa>free_for_read</oa></addata></record>
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subjects	CHEMISTRY COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS INORGANIC CHEMISTRY METALLURGY
title	Alumina prodn. by the Bayer process - removing organic impurities from the aluminate lye by treatment with lime
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