Abstract:
The apparatus comprises a bell-shaped enclosure containing a plurality of stacked horizontal trays (4). Each tray is provided with transverse rotors (5) arranged close to each other so that they cover the whole length of the tray. The rotors are provided with peripheral blades and are rotatably driven so as to form a suspension of the material and to move it along the tray. On the upper levels, the suspended material is heated, through conduction and radiation, by heating layers (11) extending between the trays. The apparatus can be used to provide uniform, controlled heat treatment of the base material in order to obtain a product having the desired characteristics.
Abstract:
Embodiments of a system and a method for manufacturing calcined gypsum can include an in-line calcination control device having an x-ray analyzer. The x-ray analyzer is adapted to analyze at least one of the calcined gypsum being discharged from the calciner and the calcined gypsum being fed into a mixer of a gypsum boardline. The x-ray analyzer is configured to determine the proportion of different calcium sulphate phases found therein which can be used to control at last one of the calciner and the boardline.
Abstract:
An agitation mechanism for a gypsum processing apparatus which includes a housing (12) having a top wall, a bottom wall, and at least one side wall. The housing can be constructed and arranged to receive and process gypsum-based products. An agitator frame (64) having a similarly shaped cross-section to the cross-section of the housing is provided and positioned adjacent the bottom wall (55) of the housing. The agitator frame (64)is pivotally connected (68, 70, 72) internally to the housing for reciprocating movement between first and second positions. The agitation mechanism is operable (74) for preventing fluid channeling to ensure good fluidization of the gypsum products from collecting adjacent the bottom wall of the housing.
Abstract:
Process for baking gypsum under superheated steam conditions consisting in stirring the charge in a rotary horizontal cylindrical oven and independently adjusting oven chamber pressure and temperature according to the temperature of the gypsum, the ambient temperature and pressure in said chamber and the charge's mass. The baking process according to the invention provides a high quality beta semihydrate-type plaster with a treatment cycle of less than one hour, and also provides all types of plasters, especially a blend of beta semihydrate and anhydrite II. The oven for carrying out said process includes means for sealing off its ends so that treatment can be carried out under controlled pressure. It also includes at its outlet, a sealed housing (19) with facilities (43) for receiving temperature and pressure sensors and especially a pyrometer (42) inserted into the central part of the oven to monitor the charge's temperature. At the same time that they monitor temperature and pressure, the sensors (13) indicate the evolution of the mass of the charge to be treated. A computer analyzes and processes all this data, adjusting oven chamber pressure and temperature as required, especially according to the type of plaster desired.
Abstract:
A system for conditioning stucco particulate material includes a vessel having separation chamber in communication with a holding chamber having a holding volume therein. The conditioning system includes the holding volume sufficient to condition the stucco particulate material therein and/or a control system configured to delay discharge of the stucco particulate material from the holding chamber. The system for conditioning stucco particulate material is configured to increase residence time of the stucco particulate material in the holding chamber to promote calcining conditioning therein.
Abstract:
Apparatus (2) for blending loose rock material (221) of a changing mineral composition having different mineral components (222, 223) to provide blended rock material (224) having predetermined portions of the different mineral components. A conveyor (21) for transporting the loose rock material (221), a first container (20) for depositing the rock material (221) of a changing mineral composition onto the conveyor (21), a second container (23) and a third container (24), both capable of separately depositing rock material of the different individual rock material components onto the conveyed rock material (221). An acoustic mineral detector unit (25), arranged after the first container (20) and before the second and third container (23, 24) for detecting the portions of the different mineral components in the conveyed rock material and regulating the quantity of the different individual rock material separately deposited from the second or the third container based on the detected portions.
Abstract:
L'invention concerne un sécher/cuiseur de gypse (1) comprenant un espace d e cuisson (2), un premier conduit (4) présentant une entrée raccordée à une source de gaz chauds (3), et une sortie débouchant dans l'espace de cuisson (2), u deuxième conduit (5) présentant une entrée raccordée à une source de gypse (8) et une sortie débouchant dans l'espace de cuisson, le deuxième conduit étant concentrique avec le premier conduit, une vis de gavage (6) disposée au moins partiellement dans le deuxième conduit, ladite vis entraînant le gypse dans l'espace de cuisson. L'invention concerne également un procédé de cuisson de gypse et le plâtre susceptible d'être obtenu par ce procédé.