| 摘要 |
An apparatus and process for preparing calcined gypsum which comprises continuously treating a mass of calcined gypsum by adding, with thorough blending, metered portions of water to the calcined gypsum. The water is incorporated into the calcined gypsum as a continuous, free-falling stream immediately after the gypsum enters the blender container near the top of its sidewall. The water must be added carefully so as not to contact either the side wall of the blender container or the propeller blade mounted in the center of the apparatus on a shaft projecting upwardly from the bottom and with the propeller spaced from the bottom of the container. The water is added in amounts ranging from about 1 to about 16% of free water by weight of the calcined gypsum fed to the blender apparatus. The calcined gypsum fed to the blender, after adding the water, is swept down the side wall of the container, flows around the propeller, and then is swept up the side wall to an exit port preferably located near the top of the side wall and near the port where the gypsum enters the container. |
