RECOVERING A CAUSTIC SOLUTION VIA CALCIUM CARBONATE CRYSTAL AGGREGATES

Techniques for converting a portion of a carbonate to hydroxide include receiving an alkaline carbonate solution that includes between 0.1M (moles per liter of solution) to 4.0M hydroxide and between 0.1M to 4.1M carbonate; reacting, in a slaking process, quicklime (CaO) and a low carbonate content...

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Bibliographic Details
Main Authors HEIDEL, KENTON ROBERT, RITCHIE, JANE ANNE, KAINTH, ARVINDER PAL SINGH, KEITH, DAVID WILLIAM
Format Patent
LanguageEnglish
French
Published 30.03.2021
Subjects
APPARATUS THEREFOR
CHEMISTRY
COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
PAPER-MAKING
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
TEXTILES
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Summary:Techniques for converting a portion of a carbonate to hydroxide include receiving an alkaline carbonate solution that includes between 0.1M (moles per liter of solution) to 4.0M hydroxide and between 0.1M to 4.1M carbonate; reacting, in a slaking process, quicklime (CaO) and a low carbonate content fluid to yield a slurry of primarily slaked lime (Ca(OH)2); and reacting the Ca(OH)2 slurry and the alkaline carbonate solution to grow calcium carbonate (CaCO3) crystal aggregates of 0.0005 mm3 to 5 mm3 in volume in a fluidized-bed reactive crystallizer. La présente invention concerne des techniques permettant de convertir une partie d'un carbonate en hydroxyde. Lesdites techniques comprennent les étapes consistant à utiliser une solution alcaline de carbonate contenant de 0,1 M (moles par litre de solution) à 4,0 M d'hydroxyde et de 0,1 à 4,1 M de carbonate; à faire réagir, dans le cadre d'un processus d'hydratation, de la chaux vive (CaO) et un fluide à faible teneur en carbonate afin d'obtenir une suspension de chaux ayant subi une première hydratation (Ca(OH)2); et à faire réagir la suspension de Ca(OH)2 et la solution alcaline de carbonate afin d'obtenir des agrégats de cristaux de carbonate de calcium (CaCO3) d'un volume de 0,0005 à 5 mm3 dans un cristalliseur à lit fluidisé réactif.
Bibliography:Application Number: CA20142905348