Abrégé

The invention concerns a method for the preparation of finely divided calcium hydroxide, where burnt lime or calcium oxide is comminuted in an impact disintegrator (10), into which in addition to the calcium oxide part of the required amount of water led to wet the particles obtained, to bind the dust and to initiate the reaction, and the material comminuted and wetted in the impact disintegrator is led into a screw conveyor (20) being in connection with the impact disintegrator. The invention is characterized in that - the reaction is essentially completed in the screw conveyor (20) by feeding into the same the remainder of the amount of water needed for the reaction, and that - the temperature of the material in the last part of the screw conveyor is kept at a target temperature, which is essentially the vaporization temperature for water at the prevailing pressure, and the material is kept at the target temperature for a certain period of time, about 5...15 s, preferably about 10 s.

Classes IPC  ?

• C04B 2/02 - Chaux
• C04B 2/08 - Dispositifs à cet effet
• C01F 11/02 - Oxydes ou hydroxydes
• C01F 11/16 - Purification
• B02C 13/22 - Désagrégation par appareils à batteurs rotatifs avec des pics s'engrenant mutuellement
• B02C 13/286 - Alimentation ou décharge
• B02C 23/18 - Addition de fluide, dans un but autre que celui de broyer ou de désagréger par l'énergie du fluide

Abrégé

a) at the shaft (22) of the second rotor (18) in the opposite direction.

Classes IPC  ?

• B02C 13/20 - Désagrégation par appareils à batteurs rotatifs à plusieurs rotors couplés
• B02C 13/09 - Désagrégation par appareils à batteurs rotatifs à arbre de rotor horizontal à batteurs fixés rigidement sur le rotor et projetant le matériau contre une plaque d'impact ou de percussion

Abrégé

The invention concerns a method for maintaining of an overpressure in an impact mill during treatment of material to be carried out therein, and an impact mill that can be pressurized. The method is characterized in that the material components needed are fed into the rotor space by a feeding arrangement enduring pressure differences; the material exiting from the rotor space is discharged by a discharge arrangement enduring pressure differences, and the target pressure in the rotor space is secured by a pressurized gasket fluid, the pressure of which is kept at least the same as the target pressure of the rotor space, or preferably slightly higher than the target pressure of the rotor space. The gasket fluid is led beneath a gasket located between the rotor shafts, and/or beneath a gasket located between the rotor shaft and a support adjacent thereto.

Classes IPC  ?

• B02C 13/286 - Alimentation ou décharge
• B02C 13/22 - Désagrégation par appareils à batteurs rotatifs avec des pics s'engrenant mutuellement

Abrégé

Method for the preparation of finely divided calcium hydroxide, where calcium oxide is comminuted in an impact disintegrator into which in addition to the calcium hydroxide a small amount of water is led to wet the particles obtained and to bind the dust. The calcium oxide powder is led to a conveyor being in connection with the impact disintegrator and operating as a pre-quencher, to which conveyer water is added and where the material is subjected to a kneading effect. The material which is a mixture of calcium oxide and calcium hydroxide is led from the conveyor to a cistern operating as post-quencher, to which cistern the remaining portion of the total water amount required for quenching is added. The amount of water added to the impact disintegrator and to the pre-quencher is altogether 20...50 % of the total amount of water required for quenching, preferably about 1/3 of the total amount of water required for quenching, and the amount of water added to the post-quencher is 80...50 % of the total amount of water required for quenching, preferably about 2/3 of the total amount of water required for quenching.

Classes IPC  ?

• C01F 11/02 - Oxydes ou hydroxydes
• C01F 11/16 - Purification
• C04B 2/04 - Extinction
• C04B 2/08 - Dispositifs à cet effet

Abrégé

The invention concerns an impact mill having a rotor apparatus comprising two concentric rotors (30, 40) equipped with coaxial shafts (10, 20), said rotors comprising blade rings (31, 32,.... and 41, 42, respectively), said blade rings being located within each other, and wherein said shafts (10, 20) are arranged within each other on the same side of the rotors (30, 40). The invention is characterized in that into the inner shaft (10) or into the outer shaft (20) is made at least one channel (14, 51, 52 or 25), running in the shaft, for the oil needed for lubrication of the bearings (11, 12) of the inner shaft.

Classes IPC  ?

• B02C 13/20 - Désagrégation par appareils à batteurs rotatifs à plusieurs rotors couplés
• F16C 33/10 - Structures relatives à la lubrification
• F16N 7/00 - Installations à huile ou autre lubrifiant non spécifié, à réservoir ou autre source portés par la machine ou l'organe machine à lubrifier