Process for the spontaneous precipitation of sulfates dissolved in water as calcium aluminium sulfate and the application of this process for the preparation of low-chloride gypsum-anhydrite containing aluminium oxide

Process for the spontaneous precipitation of sulfates dissolved in water as calcium aluminium sulfate and the application of this process for the preparation of low-chloride gypsum-anhydrite containing aluminium oxide

The invention relates to a process for the spontaneous chemical precipitation of sulphates dissolved in water as calcium aluminium sulphate, using a hydrated lime (calcium hydroxide) suspension and a sodium hydroxoaluminate solution as precipitants, and the application of this process for preparing...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: BINGS, HUBERT, LEHMKUHL, JOSEF, KOEHNK, DIETHELM, KAISER, HEIKO
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
INORGANIC CHEMISTRY
METALLURGY
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:The invention relates to a process for the spontaneous chemical precipitation of sulphates dissolved in water as calcium aluminium sulphate, using a hydrated lime (calcium hydroxide) suspension and a sodium hydroxoaluminate solution as precipitants, and the application of this process for preparing calcium aluminium sulphates which can be processed on an industrial scale into low-chloride anhydrous gypsum (anhydrite) containing alumium oxide using a thermal process known per se.