METHOD FOR THE PRODUCTION OF ALPHA-CALCIUM SULFATE HEMIHYDRATE FROM CALCIUM SULFATE DIHYDRATE

METHOD FOR THE PRODUCTION OF ALPHA-CALCIUM SULFATE HEMIHYDRATE FROM CALCIUM SULFATE DIHYDRATE

Disclosed is a method for producing alpha-calcium sulfate hemihydrate fro m calcium dihydrate. Said method has the following features: a) calcium dihy drate is fed to an agitated autoclave (1); b) the agitated autoclave (1) is indirectly heated; c) water is added and incorporated in a controlled man...

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Hauptverfasser: BROSIG, ALFRED, JAGER, REINHARD
Format: Patent
Sprache:eng ; fre
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 BROSIG, ALFRED
JAGER, REINHARD
description Disclosed is a method for producing alpha-calcium sulfate hemihydrate fro m calcium dihydrate. Said method has the following features: a) calcium dihy drate is fed to an agitated autoclave (1); b) the agitated autoclave (1) is indirectly heated; c) water is added and incorporated in a controlled manner ; d) the feedstock is prevented from adhering to surfaces of the reaction ch amber by means of moved chains (3) that are mounted on the paddles and/or th e drive shaft (16) of the agitated autoclave (1); e) the pressure in the rea ction chamber is regulated at intervals or in a continuous manner by dischar ging vapor when a certain pressure has been reached in the interior, the vap or being conducted via a centrifugal separator (17) and a control valve (18) ; f) cold air is delivered for residual drying purposes; g) the process mate rial is removed. Also disclosed is a corresponding apparatus for carrying ou t said method.
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Said method has the following features: a) calcium dihy drate is fed to an agitated autoclave (1); b) the agitated autoclave (1) is indirectly heated; c) water is added and incorporated in a controlled manner ; d) the feedstock is prevented from adhering to surfaces of the reaction ch amber by means of moved chains (3) that are mounted on the paddles and/or th e drive shaft (16) of the agitated autoclave (1); e) the pressure in the rea ction chamber is regulated at intervals or in a continuous manner by dischar ging vapor when a certain pressure has been reached in the interior, the vap or being conducted via a centrifugal separator (17) and a control valve (18) ; f) cold air is delivered for residual drying purposes; g) the process mate rial is removed. 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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 METHOD FOR THE PRODUCTION OF ALPHA-CALCIUM SULFATE HEMIHYDRATE FROM CALCIUM SULFATE DIHYDRATE
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