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Spiral Classifier

Spiral classifiers and screw sand washers are used in mineral processing and aggregates. An inclined screw rotates slowly in a tank, lifting and dewatering settled coarse particles while fines leave with the overflow. Wear is concentrated on the spiral flights and tank walls.

Spiral Classifier

Equipment Section View

Spiral classifier sectional reference diagram
Spiral classifier sectional reference diagram

Spiral classifiers and screw sand washers are used in mineral processing and aggregates. An inclined screw rotates slowly in a tank, lifting and dewatering settled coarse particles while fines leave with the overflow. Wear is concentrated on the spiral flights and tank walls.

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

Major Components and Assemblies

Individual and Maintenance Parts

Individual and Maintenance Parts

Spiral Blade / Spiral Flight
01

Spiral Blade / Spiral Flight

Spiral Blade / Spiral Flight

Material Options
Mn13Cr2 manganese steel / Hardox 400
Installation and Function
The spiral flights that convey the sand fraction
Maintenance Category
High
Spiral wear shoes / tips
02

Spiral wear shoes / tips

Spiral Wear Shoe / Tip

Material Options
Cemented carbide / polyurethane / ceramic
Installation and Function
Replaceable wear tips on the outer edge of the spiral flights
Maintenance Category
High
Spiral Flight Edge Protector
03

Spiral Flight Edge Protector

Flights Edge Protection

Material Options
Polyurethane / rubber
Installation and Function
Protects the outer edges of the spiral flights
Maintenance Category
High
Trough Liner
04

Trough Liner

Trough Liner / Tank Liner

Material Options
Polyurethane / rubber / manganese steel
Installation and Function
Protects the inside of the trough
Maintenance Category
ZH
Base Liners
05

Base Liners

Bottom Liner

Material Options
High-Manganese Steel / Hardox 400
Installation and Function
Protects the bottom of the tank
Maintenance Category
ZH
Hollow Shaft
06

Hollow Shaft

Hollow Shaft

Material Options
Carbon steel / stainless steel
Installation and Function
Central shaft supporting the spiral flights
Maintenance Category
Low
Bearing Assembly
07

Bearing Assembly

Bearing Assembly

Material Options
Stainless steel / copper alloy
Installation and Function
Upper and lower bearings supporting the spiral shaft
Maintenance Category
ZH
Lower Bearing Seal
08

Lower Bearing Seal

Lower Bearing Seal

Material Options
Polyurethane / rubber / mechanical seals
Installation and Function
Keeps water and sand out of the bearing
Maintenance Category
High
Lifting Mechanism
09

Lifting Mechanism

Lifting Mechanism

Material Options
Carbon steel / alloy steel
Installation and Function
Raises or lowers the spiral shaft to adjust clearance
Maintenance Category
Low
Overflow Weir Plate
10

Overflow Weir Plate

Overflow Weir Plate

Material Options
Stainless steel / polyurethane
Installation and Function
Weir plate used to control overflow particle size
Maintenance Category
ZH
Gear / Sprocket
11

Gear / Sprocket

Gear / Sprocket

Material Options
Alloy Steel 42CrMo
Installation and Function
Drives spiral shaft rotation
Maintenance Category
Low

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.

Material Information

  • Mn13Cr2 manganese steel: a candidate for impact-abrasion duties involving large gravel particles.
  • Hardox 400/500: wear-resistant plate options for highly abrasive zones with lower impact loads.
  • Polyurethane elastomer: typical hardness Shore A 80-95, offering corrosion resistance and noise reduction for suitable wet, fine-particle abrasion duties.
  • YG8/YG15 cemented carbide may be considered for wear tips on spiral-flight edges after suitability assessment. Confirm grade, attachment, impact and abrasion requirements separately, and evaluate life under actual operating conditions.
  • 316L stainless steel: a corrosion-resistant option, subject to compatibility with the process chemistry.

Brand Applicability

Metso, FLSmidth (Dorr-Oliver), Weir (Cavex), KSB, Sandvik, TRIO, CITIC, Baichy

Industry Applications

Closed-circuit grinding classification, aggregate washing and dewatering, coal desliming and medium removal, limestone slurry preparation for flue-gas desulphurization, and dredging.

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.

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01

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03

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04

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