Birullo Mills - Pennati Costruzioni Meccaniche S.r.l.

The Birullo style mill (twin roller) is used to grind various types of very fine materials and minerals, such as coal, petroleum coke, talc, gypsum, oxides and phosphorites.
It crushes by compression and can achieve high throughputs (up to 15 tonnes per hour); product size is achieved by a dynamic selection system built into the mill.
Crushed product is discharged by a pneumatic conveying system.
The standard machine is provided with a filter for the separation of the aeriform phase from the solid phase (crushed product) and an exhaust fan which keeps the entire line under suction.
The PLC control automatically regulates incoming feed rates and main process parameters.
The Birullo mill is available in four different sizes based on the throughput required.
  • Features
    • Grinding rollers in Ni-hard cast iron alloy, mounted on roller bearings force-need oil lubricated.
    • Track in crom-hard cast iron alloy, divided into 4 parts.
    • Possibility of grain size adjustment by means of dynamic selector driven by frequency inverter.
    • There is no reciprocal contact between the grinding rollers and the track; there is always a certain space between them, that is held by some proper spacings; the distance can be changed in such a way as to remain the same as the consuption increases.
    • The rollers rotation is due to the friction of the material only.
    • There is the contemporary drying of the wet materials, by hot air.
    • Working is completely automatic; the feeding is driven by electronic equipment.
    • The pneumatic circuit is in suction, in order to avoid any dust.
  • Models & sizes
  • How does it work

    The raw material gets into the mill through the inlet charge in the pos. 1, and falls on the rotating track in the pos. 2, that is driven by the gear reduction unit in the pos. 3. The material insinuates under the grinding rollers in the pos. 4 (idle on the shafts integral with rocker arms in the pos. 5) and causes them to turn and grind. During grinding, the rollers rotate and swing integral with the arms in the pos. 5, having their fulcrum in the hinges of the pos. 6. The swinging is opposed by the springs in the pos. 7. Through the opening in the pos. 8, air is sucked into the mill and lifts all grinded material up to the rotating dynamic selector in the pos. 9. Coarse grinded material is re-cycled by the selector and falls down to the track, then it is further on refined, while the finest grain size is sucked pneumatically through the air intake in the pos. 10. The rotary selector speed can be adjusted by the inveter in the MCC, and it changes the RPM of the electric motor in the pos. 11.

    How does it work-Birullic Mills
  • References list of fine pulverization Plants by "Birullo" Mill

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    Plant location Units no. Model Capacity /
    each mill
    Raw Material
    Puerto Madryn - Argentina 1 EC 140 13 Petroleum coke
    Fusina - Italy 1 EC 98 7 Petroleum coke
    Bolzano - Italy 1 EC 98 2 Petroleum coke
    Balangero - Italy 4 EC 170 60 Serpentine
    Balangero - Italy 2 EC 98 4 Serpentine
    Vado Ligure - Italy 2 EC 98 7 Phosphorite
    San Celoni - Italy 1 EC 98 2 Calcium carbonate
    Brindisi - Italy 1 EC 140 20 Phosphorite
    Arsiero - Italy 1 EC 98 2 Bentonite
    Trino Vercellese - Italy 1 EC 98 3 Coal
    Barletta - Italy 1 EC 98 4 Coal
    Pescara - Italy 1 EC 98 4 Coal
    Pescara - Italy 1 EC 140 15 Marn
    Collebeato - Italy 1 EC 140 11 Marn
    Collebeato - Italy 1 EC 170 16 Marn
    Sassoferrato - Italy 2 EC 98 6 Marn
    Pederobba - Italy 1 EC 140 15 Marn
    Riva Sul Garda - Italy 1 EC 140 13 Marn
    Trino Vercellese - Italy 1 EC 140 15 Marn
    Trino Vercellese - Italy 1 EC 170 25 Marn
    Tavernola Bergamasca - Italy 2 EC 98 4 Coal
    Tavernola Bergamasca - Italy 1 EC 140 11 Marn
    Bilbao - Espana 1 EC 98 4 Coal
    Marone - Italy 1 EC 98 3 Dolomite
    Ascoli Piceno - Italy 1 EC 120 5 Oil coke
    Ascoli Piceno - Italy 2 EC 98 3 Oil coke
    Narni - Italy 2 EC 98 2 Oil coke
    Larderello - Italy 2 EC 98 8 Colemanite
    Porto Marghera - Italy 3 EC 98 5 Magnesite
    Ozzano Monferrato - Italy 1 EC 140 14 Marn
    Sala Al Barro - Italy 1 EC 140 11 Lime
    Bilbao (Spagna) 1 EC 98 2 Calcium carbonate
    Monte Marciano - Italy 1 EC 98 10 Phosphorite
    Solignano - Italy 1 EC 98 2 Coal
    Mettur - India 1 EC 98 2 Oil coke
    Bolzano - Italy 1 EC 98 2 Ferrosilicon
    Bolzano- Italy 1 EC 80 2 Lime
    Este - Italy 1 EC 98 3 Oxides
    Crotone - Italy 2 EC 98 7 Phosphorite
    Porto Empedocle - Italy 1 EC 140 20 Phosphorite
    Porto Empedocle - Italy 2 EC 98 6 Phosphorite
    Orbetello- Italy 1 EC 98 6 Phosphorite
    Piano D'Orta - Italy 1 EC 98 10 Phosphorite
    Porto Marghera - Italy 5 EC 98 8 Phosphorite
    Romano Lombardo - Italy 1 EC 98 9 Phosphorite
    Pamplona - Espana 1 EC 98 7 Phosphorite
    Giovenzano - Italy 1 EC 98 2 Calcium carbonate
    Valencia - Espana 1 EC 98 4 Coal
    Lanzo Torinese - Italy 1 EC 98 3 Talco
    Sestri Ponente - Italy 1 EC 98 5 Hydrated lime
    Targia - Italy 1 EC 140 13 Marn
    Lugagnano - Italy 1 EC 140 13 Marn
    Cartagena - Colombia 2 EC 98 8 Lime
    Genova - Italy 1 EC 140 12 Calcium carbonate
    Tavernola Bergamasca - Italy 1 EC 98 3 Marn
    Lauriano - Italy 1 EC 140 13 Marn
    Livorno - Italy 2 EC 98 2 Talc
    Figueras - Espana 2 EC 98 2 Talc
    Riyad - Saudi Arabia 1 EC 170 12 Calcium carbonate
    Fabriano- Italy 1 EC 120 4 Calcium carbonate
    Nocara Umbra - Italy 1 EC 170 12 Calcium carbonate
  • Grain size diagrams
  • Capacity
  • Typical installations
  • Pictures