Tower Mill / Stirred Mill

Equipment for fine and ultrafine grinding, including regrinding and tertiary grinding. Screw agitators and liners are exposed to continuous grinding-media wear.

Equipment Section View

Complete screw agitator rendering in 3D, showing segmented wear liners over the screw flights

Workshop photograph of a large screw agitator during assembly

Wear Part Images

Illustration of a curved liner and lifting points.

Curved liners in a workshop.

Liners in a workshop.

Vertical stirred mills are used for fine grinding and regrinding. Screw designs such as Vertimill and EIRICH TowerMill use a motor, gearbox and vertical shaft to drive the screw and move the grinding media and slurry. Speed depends on the model and application. SMD, HIGmill and VXPmill use different agitator, discharge and sealing arrangements; their parts are not interchangeable with a generic screw assembly. Confirm the model, drawing number and measured dimensions when ordering.

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

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.

Major Components and Assemblies

Individual and Maintenance Parts

Screw Agitator / Impeller

Screw Impeller / Agitator

Installation Position: Around the central vertical shaft inside the mill shell

Screw Flight Tip

Screw Tip / Flight Tip

Installation Position: High-wear areas at the outer flight edges and lower end

Shell Liners

Mill Shell Liner

Installation Position: Inner Shell Wall

Bottom Plate Liner

Bottom Plate / Base Liner

Installation Position: At the bottom of the mill shell

Internal Classification Screen

Internal Classifying Screen

Installation Position: Upper overflow or internal classification area, depending on the model

Bearing Sleeve

Installation Position: At the agitator shaft support

Shaft Seals

Shaft Seal

Installation Position: Where the vertical shaft passes through the casing, depending on the design

Media Separation Screen

Installation Position: Product discharge and grinding-media retention area

Feed Chute Liner

Installation Position: Impact surfaces at the feed inlet and chute

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, OEM drawing number 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, part number 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 part number, 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.

Equipment Manufacturers and Series

Metso

Request a Tower / Stirred Mill Wear Parts Proposal

Provide the machine model, operating conditions and target service life so our engineers can recommend materials and prepare a quotation.

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