PROCESS FOR PREPARING VIRTUALLY PHASE-PURE CALCIUM SULPHATE .BETA.-HEMIHYDRATE

The invention relates to a process for preparing virtually phase-pure calcium sulphate .beta.-hemihydrate in which finely particulate calcium sulphate dihydrate in the dry state is continuously partially dewatered by appropriate action of heat in a calcination apparatus. In this process, the finely...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	KOSLOWSKI, THOMAS, HESSLER, KLAUS-MICHAEL, MORGENROTH, HENNING
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS CONCRETE INORGANIC CHEMISTRY LIME, MAGNESIA METALLURGY REFRACTORIES SLAG TREATMENT OF NATURAL STONE
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The invention relates to a process for preparing virtually phase-pure calcium sulphate .beta.-hemihydrate in which finely particulate calcium sulphate dihydrate in the dry state is continuously partially dewatered by appropriate action of heat in a calcination apparatus. In this process, the finely particulate calcium sulphate dihydrate is heated in a first stage to a temperature of from about 110 to 140.degree.C and then, in a second stage, held at a temperature of from 110 to 140.degree.C under a water vapour atmosphere until virtually phase-pure calcium sulphate .beta.-hemihydrate is obtained.