Yoshino Gypsum Co., Ltd.

Kouji Nitoh

Takeshi Takenaka

Masaru Yoshida

Katsumi Niimi

Kazumi Endo

A fluidized-bed-type apparatus and method for treating gypsum, which activates or improves fluidity of gypsum powder to promote an effect of treatment of gypsum, such as modification or homogenization of the gypsum powder. The apparatus for treating gypsum includes a reactor vessel, a conditioned air supply port, a horizontal partition wall and a plurality of stationary vanes. The wall allows a conditioned air flow to flow upward into a reaction region. The vanes are arranged at an angular interval in a circumferential direction. A fluidized bed of calcined gypsum is provided in the vessel. The vane deflects the conditioned air flow flowing upward into the reaction region, toward a radially outward and circumferential direction of the reaction region. The calcined gypsum makes a saltational fluid motion or saltational movement in the vessel with the air flow.

Apparatus and method for treating gypsum

An apparatus for calcination of gypsum includes a gypsum calciner having an interior wall surface with a circular or annular configuration as seen in its plan view, and a tubular combustor positioned at a center part of a body of the calciner. Raw gypsum is calcined or dehydrated by a high temperature gas spouting flow (Hg) ejected from a lower portion of the combustor. The calciner has a stationary-vane-type or movable-vane-type auxiliary device, which circumferentially energizes the raw gypsum in the vicinity of the interior wall surface toward a circumferential direction of the calciner. The auxiliary device has a plurality of stationary vanes circumferentially arranged in an outer peripheral zone of a lower portion of the combustor and spaced apart from each other at an angular interval, or an agitator extending through a conical or inner circumferential surface defined by the interior wall surface.

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Tokyo, Japan

Kouji Nitoh