Rotary Scrubber

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Product Details

Heavy-Duty Rotary Scrubber Wash Plant for High-Clay Alluvial Ores

In alluvial and placer mining, sticky clay is your worst enemy—it traps valuable fine gold and heavy minerals, washing your profits straight into the tailings. The Rotary Scrubber is the ultimate heavy-duty washing equipment engineered specifically to break down tenacious clay, soft oxides, and agglomerated mud.

Unlike standard trommel screens that simply tumble the material, our Rotary Scrubber Wash Plant utilizes a solid cylinder equipped with internal lifter bars. As the massive drum rotates, it lifts the rocks and clay, allowing them to crash back down upon themselves. This intense autogenous scrubbing action, combined with high-pressure water, literally tears the clay apart, perfectly liberating the free gold and heavy minerals.

Capable of handling raw feed sizes up to 230mm and massive throughputs from 50 to 300 tons per hour, this Clay Washing Machine is the critical first step in any successful alluvial gold, alluvial tin, or bauxite gravity separation circuit.

Heavy-duty Rotary Scrubber Wash Plant for alluvial gold mining

Why Our Trommel Scrubber Beats the Competition

Unmatched Clay-Busting Power: Achieves a clay decomposition rate of over 95%. It easily processes difficult, sticky ores with mud contents exceeding 30%, far outperforming traditional log washers or simple vibrating screens.
Military-Grade Durability: The main drum is constructed from thickened manganese steel plates (up to 20mm) and lined with replaceable wear-resistant rubber or steel liners, ensuring a lifespan of over 5 years even in harsh African or South American mining conditions.
Integrated Trommel Screen (Optional): The discharge end can be fitted with a trommel screen section (polyurethane or high-carbon steel wire). This allows you to scrub and size the material in a single machine, sending only the fine, gold-bearing slurry directly to your Centrifugal Concentrators or Mineral Jigs.
Robust Transmission: Driven by heavy-duty gear and pinion or reliable friction rubber tires (for smaller models), capable of handling massive shock loads from large boulders.

Rotary Scrubber internal lifter bars and heavy-duty cylinder

How a Rotary Scrubber Works (Washing Principle)

Feeding: Raw, clay-heavy alluvial gravel is fed into the rotating solid cylinder along with a high volume of water.
Autogenous Scrubbing: As the drum rotates, the internal lifter blades pick up the rocks and clay balls, dropping them repeatedly. The large rocks act as the grinding media, smashing the sticky clay apart (rock-on-rock friction).
Slurrying: The high-pressure water mixes with the broken clay, turning it into a liquid slurry, fully liberating the heavy minerals and fine gold.
Discharge & Screening: The washed mixture moves to the discharge end, which usually features a trommel screen. The barren oversize rocks are rejected, while the valuable fine slurry passes through the screen for gravity recovery.

Rotary Scrubber operating at an alluvial mining site in Africa

Applications in Placer Mining

The rotary scrubber is the foundation of high-recovery alluvial mining operations:

Alluvial/Placer Gold: The absolute best machine for breaking down cemented clay to release fine, invisible placer gold.
Alluvial Tin (Cassiterite) & Tantalite: Processing deeply weathered crusts and sticky sedimentary deposits.
Diamond Washing: Gently scrubbing clay without breaking valuable rough diamonds.
Lateritic Iron & Bauxite: Removing sticky mud from coarse ores to upgrade the mineral grade before shipment.

Placer mining equipment setup with a Trommel Scrubber

Technical Specifications & Custom Manufacturing

We build Rotary Scrubbers tailored to your specific mine conditions!

Because every alluvial deposit is different, we custom-engineer our wash plants. We manufacture machines with:

Maximum drum diameters up to 3.2 meters.
Unlimited length configurations depending on how much retention time the clay needs to dissolve.
Massive processing capacities exceeding 300 tons per hour.

Please contact our engineering team to design the perfect wash plant for your clay content and capacity requirements.

Frequently Asked Questions (FAQ)

Q1: What is the difference between a Rotary Scrubber and a Standard Trommel Screen?

A: A Trommel Screen is mostly covered in mesh and is primarily used for sizing loose, sandy gravels. A Rotary Scrubber has a solid steel washing section that holds water and rocks inside, acting like a giant washing machine to aggressively break down sticky clay before it reaches the screening section.

Q2: Does a rotary scrubber require a lot of water?

A: Yes, effective clay scrubbing requires a high volume of water to turn the mud into a flowing slurry. However, our wash plants are designed to integrate seamlessly with dewatering screens and recycled water systems, allowing you to reuse up to 40% of the water on site.

Q3: Can it handle very large boulders?

A: Absolutely. Large rocks (up to 230mm) are actually beneficial inside the solid drum as they act as the grinding media to smash the clay. For rocks larger than the feed opening, we recommend installing a grizzly grid over your feed hopper.