A PROCESS FOR THE CONTINUOUS PREPARATION OF ALPHA-CALCIUM SULPHATE HEMIHYDRATE AND A PARTICULATE GYPSUM

A PROCESS FOR THE CONTINUOUS PREPARATION OF ALPHA-CALCIUM SULPHATE HEMIHYDRATE AND A PARTICULATE GYPSUM

The present application describes a process for the continuous production of alpha-calcium sulphate hemihydrate, the process comprising the steps of: providing particulate gypsum; providing water; mixing the particulate gypsum and the water to form a gypsum slurry; and maintaining said gypsum slurry...

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Hauptverfasser: Colombo, Jöel, Tran, Binh, Magaud, Lionel, Francy, Olivier
Format: Patent
Sprache:eng
Schlagworte:
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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creator Colombo, Jöel
Tran, Binh
Magaud, Lionel
Francy, Olivier
description The present application describes a process for the continuous production of alpha-calcium sulphate hemihydrate, the process comprising the steps of: providing particulate gypsum; providing water; mixing the particulate gypsum and the water to form a gypsum slurry; and maintaining said gypsum slurry under raised pressure and temperature to convert the particulate gypsum into alpha-calcium sulphate hemihydrate and provide an alpha-calcium sulphate hemihydrate slurry. Additionally, the particulate gypsum comprises a D10 value greater than or equal to 2 μm, a D90 value smaller than or equal to 90 μm and a D50 value smaller than or equal to 25 μm. Particulate gypsum for use in the process is also provided.
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subjects ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
title A PROCESS FOR THE CONTINUOUS PREPARATION OF ALPHA-CALCIUM SULPHATE HEMIHYDRATE AND A PARTICULATE GYPSUM
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