KR830007460A - Calcination method and apparatus of calcium sulfate dihydrate - Google Patents

Abstract

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Description

Calcination method and apparatus of calcium sulfate dihydrate

Since this is an open matter, no full text was included.

1 is a schematic cross-sectional view of a calcined kettle according to British Patent No. 1488665, modified in accordance with the present invention.

2 is a cross-sectional view of a burner tube suitable for the kettle of FIG.

3 is a schematic cross-sectional view of the calcining vessel according to British Publication No. 2032219, modified in accordance with the present invention.

Claims (15)

In the method of calcining gypsum in which the phase of powdered gypsum is directly heated by introducing a hot gas into the phase in order to maintain the calcium sulfate hemihydrate at a temperature suitable for formation, water is sprayed into the gas phase to make it insoluble. Calcination method of gypsum, characterized in that the formation of hard gypsum is reduced. The method of claim 1 wherein moisture is sprayed with the hot gas prior to contacting the hot gas with the gypsum. The method of claim 1 wherein water is sprayed into the gypsum top portion occupied or passed by the exhaust gas from the gypsum phase. 3. The method of claim 2 wherein hot gas is introduced into the vessel through a tube extending downwardly from the top of the vessel and a hole in the bottom of the vessel and water is sprayed in the vessel. 5. The method of claim 4, wherein hot gas is supplied by a burner installed in the tube and water is sprayed at the same level as the burner. The method according to any one of claims 2 to 5, wherein the gypsum is contained in the container and additionally heated indirectly by thermal conduction through the container wall. 6. The method according to claim 4 or 5, wherein the gypsum is introduced into the lower end of the tube so that the hot gas from the tube is contained in the vessel having a lower region that is stirred and heats all the materials in the vessel. 8. The method according to claim 6 or 7, wherein the gypsum is continuously introduced into the container and continuously recovered under flooded or calcined conditions. An apparatus for calcining a gypsum consisting of a calcining vessel for containing a bed of gypsum to be calcined and means for directly introducing hot gas into the gypsum bed, the apparatus for calcining water in or near the vessel, the means for spraying water into the gas phase. Gypsum calcination apparatus characterized in that it has. 10. The apparatus according to claim 9, wherein the apparatus is installed in a tube container for introducing hot gas expanding downward in the vessel and at least one spray jet for moisture is installed in the tube. The apparatus of claim 10, wherein a burner is installed in the tube to provide a source of hot gas and at least one fire spray is installed in the tube near the level of the burner. 12. The apparatus of claim 9, 10 or 11, wherein the vessel has a thermally conductive wall and is surrounded by a heating chamber for direct heating of the vessel contents. 12. The device of claim 9, 10 or 11, wherein the container has a lower region shaped to direct the contents of the container toward the lower end of the tube. The apparatus according to any one of claims 9 to 13, wherein the apparatus is provided with means for continuously introducing a discharge tube or weir and powdered gypsum in which the calcined material is continuously recovered. 10. The apparatus according to claim 9, wherein at least one spray jet for moisture is installed in the portion occupied or passed by the exhaust gas from or near and in the vessel at the level of gypsum phase in operation. ※ Note: The disclosure is based on the initial application.