초록 ▼

An apparatus for effecting the thermal conversion of gypsum to calcium sulfate hemihydrate includes a reactor having a series of fluidized bed compartments containing separate heat exchangers and defined by partitions each provided with an opening which is selected so that the material undergoing tr

An apparatus for effecting the thermal conversion of gypsum to calcium sulfate hemihydrate includes a reactor having a series of fluidized bed compartments containing separate heat exchangers and defined by partitions each provided with an opening which is selected so that the material undergoing treatment progresses, without return movement, through the series of fluidized bed compartments. The apparatus is further constructed so as to permit recycling of fine gypsum particles from the outlet to the middle of the reactor.

대표청구항 ▼

Apparatus for thermally treating gypsum to dehydrate it into calcium sulfate hemihydrate, comprising: a reactor having an inlet end and an outlet end; a plurality of partitions defining a series of compartments within said reactor between the inlet and outlet ends thereof; means for introducing gyps

Apparatus for thermally treating gypsum to dehydrate it into calcium sulfate hemihydrate, comprising: a reactor having an inlet end and an outlet end; a plurality of partitions defining a series of compartments within said reactor between the inlet and outlet ends thereof; means for introducing gypsum into the compartment adjacent the inlet end of said reactor; means for continuously introducing a fluidization gas into each of said compartments at a rate such that gypsum located therein is continuously fluidized; a heating element disposed in at least some of said compartments so as to be immersed within the fluidized gypsum in its respective compartment; an opening disposed in each of said partitions, said openings being dimensioned and located such that a continuous, substantially horizontal movement of homogeneous fluidized gypsum, from the input to the output end of said reactor, is established and the flow of fluidized gypsum between two compartments in the other direction is inhibited; and means for heating said heating elements to temperatures such that the temperature of fluidized gypsum progressively increases in each compartment having a heating element from the input to the output ends of said reactor.