Coarse Material Screw Washers

McLanahan Coarse Material Screw Washers

Efficient Washing, Scrubbing and Classification of Coarse Materials

McLanahan Coarse Material Screw Washers are heavy-duty washing machines designed to clean, scrub and classify coarse aggregate and mineral materials.

They combine washing, scrubbing, conveying and classification in a single machine, making them suitable for removing clay, dirt, coatings and unwanted fines from coarse feed materials.

Coarse Material Screw Washers are commonly used in aggregate, quarrying, mining and mineral processing applications where coarse material requires washing and sizing before further processing or final use.

How McLanahan Coarse Material Screw Washers Work

Feed material and water enter the washing chamber.

Inside the machine, one or two rotating screw shafts agitate and move the material through the washer.

The rotating screws provide vigorous scrubbing action, causing the particles to rub against each other and helping to loosen clay, dirt and other unwanted materials.

As the material moves through the washer, the screw flights convey the cleaned coarse material toward the discharge end.

Fine material, clay and other unwanted particles are suspended in the wash water and can be removed separately.

The process can be summarized as:

Feeding + Washing + Scrubbing + Conveying + Classification

Aggressive Washing and Scrubbing

The rotating screw shafts provide continuous agitation and scrubbing of the feed material.

This action helps remove contaminants that are tightly attached to the surface of aggregate and mineral particles.

Coarse Material Screw Washers are particularly effective for materials containing:

Clay
Dirt
Mud
Fine particles
Surface coatings
Organic material
Other unwanted contaminants

Removal of Clay and Unwanted Fines

Clay and excessive fines can reduce the quality of aggregate and interfere with downstream processing.

The washing and scrubbing action helps separate these unwanted materials from the coarse product.

The wash water carries the liberated clay and fines away from the coarse material, allowing the cleaned product to be discharged separately.

Coarse Material Classification

In addition to washing, the machine can provide a degree of classification by separating coarse material from finer particles.

The coarse product is conveyed toward the discharge end, while finer material remains suspended in the wash water and can be removed from the washing process.

This makes the Coarse Material Screw Washer useful in applications where washing and coarse material separation are required in the same stage.

Single and Twin Shaft Configurations

Depending on the application, Coarse Material Screw Washers can be configured with one or two screw shafts.

Twin-shaft configurations provide increased material agitation and scrubbing action and can be particularly suitable for difficult-to-wash materials.

The appropriate configuration depends on:

Material characteristics
Required capacity
Feed size
Clay content
Required washing intensity
Product specifications

Applications

McLanahan Coarse Material Screw Washers are suitable for applications including:

Aggregate washing
Quarrying
Mining
Mineral processing
Sand and gravel processing
Clay removal
Coarse material washing
Material classification
Product cleaning
Washing and sizing

Typical materials include:

Crushed stone
Gravel
Limestone
Granite
Sand and gravel
Recycled aggregates
Mineral ores
Clay-contaminated aggregate
Other coarse bulk materials

Key Features & Benefits

Heavy-duty coarse material washing
Effective scrubbing action
Helps remove clay, dirt and mud
Removes unwanted fines and contaminants
Combines washing and conveying
Provides coarse material classification
Single- or twin-shaft configurations
Continuous material movement
Suitable for demanding applications
Robust construction
Suitable for high-capacity operations
Can be integrated into complete washing plants
Suitable for mining, quarrying and aggregate applications
Improves cleanliness and quality of the final product

Factors Affecting Coarse Material Screw Washer Performance

Actual capacity and washing performance depend on several factors, including:

Feed rate
Feed particle size
Material type
Bulk density
Clay content
Material hardness
Material abrasiveness
Moisture content
Water flow rate
Slurry concentration
Screw speed
Screw configuration
Retention time
Required degree of cleaning
Product specifications

Proper equipment sizing, water management and process design are essential for achieving the required washing performance.

Selecting the Right Coarse Material Screw Washer

The appropriate Coarse Material Screw Washer should be selected based on:

Material type
Required capacity (TPH)
Maximum feed size
Feed gradation
Bulk density
Clay content
Moisture content
Material abrasiveness
Required degree of cleaning
Water availability
Required scrubbing intensity
Number of screw shafts
Downstream screening and classification equipment
Overall process flowsheet

Laboratory or pilot testing may be recommended for applications where material characteristics or washing performance need to be evaluated.

Cube Solutions can evaluate your application requirements and assist in selecting the appropriate McLanahan Coarse Material Screw Washer configuration.