01
Screw Agitator / Impeller
Screw Impeller / Agitator
- Installation Position
- Around the central vertical shaft inside the mill shell
Vertical Stirred Mill and Tower Mill Wear Parts
Equipment for fine and ultrafine grinding. Identify wear parts by screw, disc/stator or other host mechanisms; do not treat all units as one high-speed screw design.
Equipment Section View
Components of different OEMs are not interchangeable by name alone. Provide the brand, series, model, drawing and measured dimensions; materials and heat treatment are then set per duty.
Group vertical stirred mills by mechanism: Vertimill-type screws, HIGmill discs and stators, and VXPmill discs and lining. Wear parts, media separation, discharge and shaft seals are not a generic interchange list. Confirm the machine model, drawing and measured dimensions when ordering.
Equipment Parts
Part Identification and Technical Details
Explore part names, images, material options and technical requirements. Select a card to open the corresponding replacement part page.
Individual parts
Individual and Maintenance Parts
02
Screw Flight Tip
Screw Tip / Flight Tip
- Installation Position
- High-wear areas at the outer flight edges and lower end
05
Internal Classification Screen
Internal Classifying Screen
- Installation Position
- Upper overflow or internal classification area, depending on the model
07
Shaft Seals
Shaft Seal
- Installation Position
- Where the vertical shaft passes through the casing, depending on the design
08
Media Separation Screen
Media Separation Screen
- Installation Position
- Product discharge and grinding-media retention area
10
Discharge Pipe Liner
Discharge Pipe Liner
- Installation Position
- Erosion zones in discharge pipes, elbows and reducers
Materials for similarly named parts may differ by OEM, machine model and operating conditions. Confirm the machine model, drawing and measured dimensions before ordering or manufacture.
Key Features
- Grinding Efficiency: Fine-grinding performance depends on the ore, media, power and residence time. Define the product size through testing and the process design.
- Reduced Media Consumption: The agitator design guides grinding media movement to reduce media wear
- Flexible Configuration: Speed, media size and slurry concentration can be adjusted for different ore characteristics
- Compact Footprint: Vertical installation makes efficient use of plant floor space
Materials for similarly named parts may differ by OEM, machine model and operating conditions. Confirm the machine model, drawing and measured dimensions before ordering or manufacture.
Engineering Considerations for Key Wear Parts
- Screw / Agitator: The screw assembly drives media and slurry movement. Identify the shaft, flights, liners and fasteners separately. High-chromium white iron or abrasion-resistant steel may be specified for wear zones; the complete assembly is not necessarily cast from a single material.
- Screw Liners / Wear Liners: Screw liners protect the working surfaces of the flights. Confirm wear liner and end liner quantities, generations and attachment details for the specific model. Use the specified lifting equipment with designed lifting points and follow the installed mill maintenance procedure.
- Shell and Base Liners: Shell and base liners are exposed to grinding media and slurry wear. Metso Orebed magnetic liners retain magnetic material to form a protective layer. Suitability depends on the ore, media and mill design.
- Wear Caps and Shaft Liners: Protect the screw shaft end and agitator shaft surface from wear, reducing damage to the shaft and overhaul costs
- Rubber Pads: Some screw liner configurations require pads or rubber pads. Confirm the material, thickness, quantity and installation position against the parts list for that model.
- Classification and Media Separation Screens: Identify classification and media-retention arrangements separately for each model. Media separation screens retain the grinding media, while product size also depends on grinding conditions and circuit control. Confirm openings, material and connections against the drawing.
- Shaft Seals: Seal the vertical shaft penetration to prevent slurry leakage and grinding-media ingress into the bearing cavity
Parts with the same name can use different materials across OEMs, models and duties. Metso Vertimill screw liners have multiple design generations. Confirm bolts, lifting points and geometry for the exact model, model details and installed configuration.
Engineering Selection Considerations
Tower Mill Screws and Liners: Practical Performance Improvements
To improve wear life, first identify the installed screw or liners, then assess materials and design for the operating conditions. Metso Vertimill, EIRICH TowerMill, FLS Tower Mill and VXPmill each require their own drawings, agitator design and interfaces.
What Information Is Needed for a Tower Mill Screw Enquiry?
Provide the known OEM or brand, full model and serial number, screw assembly drawings or existing model details, installation position, interfaces, dimensions, material, grinding media, slurry details and operating conditions.
How Can Screw Performance Be Improved?
Identify the actual wear zones and failure modes, then review the protection coverage, connections, interfaces, material requirements and operating conditions. Any service-life comparison must use operating records from before and after the modification.
Are Screws Interchangeable Between Different Vertical Mill Brands?
No. Similar operating principles do not establish interchangeability. Manufacture must follow the applicable drawings, dimensions, interfaces and submitted equipment documentation.
Identification
Identification and Inquiry Checks
Separate Vertimill screw liners, HIGmill discs/stator rings and VXPmill discs/lining. Record machine, agitator revision, media, interfaces, discharge and seals. Different media and mechanisms do not share one speed or a universal P80 guarantee.
Identification FAQ
Are all stirred mills high-speed screw mills?
No. Distinguish screw, disc and other designs.