Drying mill and method of drying ground material

B - Operations – Transporting – 02 – C

Patent

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Details

B02C 13/18 (2006.01) B02C 13/14 (2006.01) B02C 13/288 (2006.01)

Patent

CA 2616463

The invention relates to a drying mill for powdered or fine-grained material, in particular also suitable for calcining gypsum, with a housing (39), in which a feed device (42) for fuel gas, opening into a lower region, a comminuting device and a material inlet (31), charging the material onto the comminuting device from above, are provided one above the other, a material outlet (38) leading to the outside from an upper region of a working chamber (30) and a return leading downwards to the comminuting device, the comminuting device being a centrifugal disc (32) which rotates in a horizontal plane and interacts with an impact casing (35) arranged on the inside of the housing. According to the invention, a nozzle ring (45) surrounding the centrifugal disc (32) from below is provided for feeding fuel gas into the working chamber. As a result, the calcining process in particular is assisted in an efficient way by utilizing the thermal energy of the hot gas fed into the working chamber by means of the nozzle ring and the dwell time in the working chamber. The invention also relates to a corresponding comminuting method.

L'invention concerne un broyeur-sécheur destiné à une matière pulvérulente ou à grains fins et convenant, en particulier, à la calcination du gypse. Ce broyeur présente un corps (39), dans lequel sont superposés un dispositif d'alimentation (42) en gaz propulseur débouchant dans une zone inférieure (42), un dispositif de broyage et une entrée de matière (31) qui déverse la matière sur le dispositif de broyage par le haut, une sortie de matière (38) s'étendant d'une zone supérieure de la chambre de travail (30) vers l'extérieur, un canal de retour s'étendant vers le bas jusqu'au dispositif de broyage et le dispositif de broyage étant un disque centrifuge (32) tournant dans le plan horizontal, lequel disque coopère avec une enveloppe de rebondissement (35) placée contre le corps à l'intérieur de ce dernier. Selon ladite invention, un anneau de buses (45), destiné à l'alimentation en gaz propulseur et entourant le disque centrifuge (32) par le bas, est placé dans la chambre de travail. Ainsi, le processus de calcination est favorisé de manière efficace grâce à l'utilisation de l'énergie thermique du gaz chaud injecté dans la chambre de travail au moyen de l'anneau de buses et grâce au temps de séjour dans la chambre de travail. Cette invention concerne également un procédé de broyage correspondant.

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