The FLSmidth OK mill The higheffiency and reliable roller mill for cement and slag grinding

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The FLSmidth OK millThe high-effiency and
reliable roller mill for cement and slag grinding
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First FLSmidth vertical mill (1922)
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ATOX Raw Mill
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OK Mill layout

• Simple and space-saving layout
• Proven technology based on a
• license (1993) from Onoda and
• Kobe Steel, Japan
• High efficiency separator
• Equivalent or better cement quality than tube
  mill cement
• Energy saving. 25 to 45 in kWh
• compared to Ball Tube Mills
• Very suitable for grinding blended
• cement or slag
• Easily controllable particle size
• distribution

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FLSmidth OK mill
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OK Mill - a Unique design developed
specifically for cement and slag grinding
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OK Vertical mill grinding partsPressure
distribution
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OK mill efficiency compared to ball mills
Ball mill
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OK mill
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Importance of cement grinding on total plant
power consumption
with OK mill
with ball mill
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Clinker production capacity 1.5 mill
t/year Cement type Ordinary Portland Cement EF
Emission Factor (tCO2/MWh)
EF 1.0
EF 0.75
EF 0.5
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Clinker replacement materials for blended cement

• It is good for the environment
• Saving of raw materials
• Energy saving
• Reduced CO2 emission
• Waste utilization (slag and fly ash)
• OK mill is very suitable for grinding of blended
  cement
• It is more versatile than a ball mill. Separate
  drying facilities are not required. It is easy to
  change from one product type to another product
  with practically no transition periods between
  products.
• Besides pure slag it can grind any type blended
  of cement with additives such as limestone,
  pozzolana, fly ash and slag even with high water
  content

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OK mill performance
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- 14
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Easy commissioning of millFirst 40 days of OK
mill operation
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OK mill product quality
Conclusion Quality of cements produced in OK
mills is very similar to those produced in ball
mills with high efficiency separators
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OK mills sold July 2008
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All together 92 FLSmidth OK mills sold world wide
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Summary of experiences with OK Mills commissioned
by FLSmidth

• The production is above guaranteed
• The spec. energy consumption below guaranteed
• It grinds all kind of cements with additives
• The operational parameters can be adjusted to
  meet quality requirements
• It can be operated with two rollers only
• It is reliable in operation, easy to operate and
  easy to maintain

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Thank you for your attention