Bondable calcium sulphate - by roasting calcium sulphite pieces,immersing in water,roasting again and grinding

The calcium sulphate pieces are stored after immersion in water and before the second roasting. The calcium sulphate pieces for the first and second roasting operations are placed in two layers on a roasting belt so that the hot gases in the roasting zone first contact the layer for the second roast...

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Main Authors KNAUF, ALFONS., 6639 SIERSBURG, SCHLAGOWSKY, PETER, 6630 SAARLOUIS, KNAUF, KARL, 8715 IPHOFEN, WIRSCHING, FRANZ. DR., 8715 IPHOFEN
Format Patent
LanguageEnglish
German
Published 29.03.1973
Edition1
Subjects
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
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Summary:The calcium sulphate pieces are stored after immersion in water and before the second roasting. The calcium sulphate pieces for the first and second roasting operations are placed in two layers on a roasting belt so that the hot gases in the roasting zone first contact the layer for the second roasting operation and then the layer for the first roasting operation. The once roasted calcium sulphate pieces are divided into two parts, the first part is roasted to calcium sulphate hemihydrate in a roasting oven, and is used exclusively for the prodns. of calcium sulphate pieces, and the second part is immersed in water, roasted again and ground. The calcium sulphate pieces have a size of 10-25 pref. 14-20 mm. The two layers of calcium sulphate pieces on the roasting belt each have a thickness of 30 cm.
Bibliography:Application Number: DE19712146777