Desilication of aluminate soln. for high purity aluminaprodn. - by treating with calcium contg. reagentsincluding desilicatin prod

Process comprises successive treatments by a desilication reaction prod. (a) mainly consisting of a cpd. of formula 3CaO.Al2O3.nSiO2.(6-2n)H2O, and a reagent (b) of formula 4CaO.Al2O3.(0.1-0.6)X.mH2O, where n is at most 1, X is CO2 and/or SO3, m=8-15. To increase efficiency, the first reaction time...

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Main Authors ISAAK ABRAMOVICH ZATULOVSKY, VALENTIN NIKOLAEVICH AFANASIEV, IVAN MIKHAILOVICH KOSTIN, ZARYA NIKITICHNA ALEXANDROVA, VIKTOR MIKHAILOVICH SIZYAKOV, KHOREN AZARAPETOVICH BADALIANTS, EVGENY ALEXANDROVICH ISAKOV, VINETSY IVANOVICH CHERNOV, NIKOLAI ANDREEVICH KALUZHSKY, ALEXANDR GRIGORIEVICH ZHUKOV
Format Patent
LanguageEnglish
Published 01.02.1983
Subjects
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
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Summary:Process comprises successive treatments by a desilication reaction prod. (a) mainly consisting of a cpd. of formula 3CaO.Al2O3.nSiO2.(6-2n)H2O, and a reagent (b) of formula 4CaO.Al2O3.(0.1-0.6)X.mH2O, where n is at most 1, X is CO2 and/or SO3, m=8-15. To increase efficiency, the first reaction time is 0.5-2 hrs., at 40-105 degrees C. Pref., the second reagent (b), calculating relative to CaO CaO, has the b:SiO2 weight ratio 10-25, and the a:b ratio is 1-3:1. Thus, CaO, Pl2O3, Na2CO3, K2CO3, Na2SO4, K2SO4 are reacted in aluminate solution in molar ratios CaO:Al2O3=3.75-5.0 and Y:Al2O3=0.1-0.6, where Y=Na2CO3, Na2SO4 and/or K2SO4.
Bibliography:Application Number: PT19830076143