Specifications

Vertical mill internals

      The most important internals in a vertical mill are the rollers and tables (also called respectively vertical mill tires and rings). Several rollers (two to six according to the size of the mill) are placed around the table. A vertical mill takes its name after the vertical axis upon which it rotates. The material to be ground is fed into the mill from its top. It falls on the table placed at the bottom of the mill.

Due to the centrifugal force generated by the rotation of the main shaft the grinding rollers are pressed closely upon the grinding ring and grind the material fed into the mill (raw, cement or coal for instance) as they roll. The qualified material (i.e. the one which has reached the requested size) will leave the mill with the airflow while the unqualified one will be brought back to the grinding chamber for another round of grinding.

      Magotteaux manufactures vertical mill internals in high wear resistance steels and irons, be they standard mono alloys, bi-metal or composite (i.e. a metal matrix alloyed with an even higher resistance material like ceramic). Magotteaux pioneered the use of composite solutions in vertical mill internals, vertical mill rollers as well as vertical mill tables (or vertical mill tires as well as rings).

Xwin®

Name: Xwin®.

Industry:

• Cement.
• Power Stations.

Equipment: Vertical Roller Mills – one-piece or segmented rollers and one-piece or segmented tables.

Tech specs:

• Patented Metal Matrix Composite (MMC) technology composed of high chrome alloy and ceramic.
• Combination providing extreme wear resistance of ceramic with mechanical properties of cast alloys.
• Performed by means of a specialized casting process.

Key Benefits:

• Increased lifetime vs. high chrome alloys from 1.5 to 4+ times depending on application and mill design.
• No more susceptible to breakage than a solid high chrome casting. 

Duocast® Xwin®

 These solutions aim at resisting risk of breakage in certain applications combined with high wear resistance.  

Name: Duocast® Xwin®.

Industry:

• Cement.
• Power Stations.

Equipment: Vertical Roller Mills – rollers only.

Tech specs:

• Technology consisting of very hard and special cast iron inserts embedded in a ductile iron base.
• The ductile iron core has a hardness of about 300 BHN and an elongation of about 7%.
• HiCr iron inserts are held in the ductile iron by dovetails to form a mechanical bond when the base metal is cast.
• Performance is improved by adding a layer of Metal Matrix Composite (MMC) in the HiCr inserts.

Key Benefits:

• Combines the hard wear resistance of the special inserts with the ability of the ductile iron to operate under very high mechanical stresses.
• Increased lifetime vs. Duocast® solution.

NeoX®.

Industry:

• Cement.
• Power Stations.

Equipment: Vertical Roller Mills – one-piece or segmented rollers and one-piece or segmented tables.

Tech specs:

• New generation of ceramic technology.
• 100% home developed.

Key Benefits:

• 25 to 50% increased lifetime vs. Xwin® technology depending on application and mill design.
• No more susceptible to breakage than a solid high chrome casting.
• A unique opportunity in cases where performance of Xwin® solutions is not sufficient to achieve the requested maintenance schedule cycles.

 Mill type and their Alloy: