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Alluvial Gold Washing Plant

SINOLION MACHINERY is one of the most professional heavy duty trommel screen and gold wash plant manufacturers in China. Please feel free to buy durable products for sale here from our factory. All machines are with high quality and competitive price.

Product Overview

An alluvial gold washing plant processes unbonded auriferous gravel, sand, and clay to separate free gold particles from gangue material using wet gravity separation. The standard modular setup integrates a feed hopper with a grizzly bar, a heavy-duty rotary trommel scrubber, a multi-stage rougher sluice box, and an optional centrifugal concentrator for fine gold scavenging. Built around a structural Q345B steel skid, the plant handles high-tonnage abrasive feeds containing up to 30% clay without blinding downstream separation stages.

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Working Principle

Raw feed enters the hopper and passes a stationary grizzly to reject oversized boulders exceeding 200 mm. The material drops into the rotating trommel cylinder, where internal spiral lifters and high-pressure water spray bars (operating at 0.3 to 0.5 MPa) break down cohesive clay lumps and scour coarse gravel. Screen panels classify the material: oversize barren rock discharges via the trommel tail chute, while undersize slurry (<6 mm to 12 mm) flows by gravity into the recovery circuit. Heavy minerals settle behind riffles or within fluidised centrifugal bowls based on specific gravity differential.

Key Features

Heavy-Duty Trommel Shell

Fabricated from 16Mn / Q345B alloy steel plate with bolt-on, replaceable high-manganese steel or abrasion-resistant polyurethane screen panels.

Integrated Clay Scrubbing

High-shear internal lifter bars tumble boulders against each other, dissolving sticky clay matrices that typically trap fine gold and cause screen blinding.

Dual-Drive Friction System

Heavy-duty trunnion rollers driven by dual flange-mounted shaft-mounted gearboxes distribute torque evenly, eliminating single-point gear failure.

Water Balance Management

Manifold piping system with independent flow control valves regulates wash water volume precisely per screen deck and sluice run.

Modular Skid Base

Heavy structural I-beam underframe requires zero concrete foundation work on site; pre-drilled lifting lugs allow rapid crane positioning and containerized shipping.

Mobile Gold Trommel Portable Gold Wash Plant

Applications

River valley alluvial gold mining operations requiring high daily throughputs (50 TPH to 300 TPH).

Tailings reprocessing operations targeting unrecovered fine gold from historical gravity circuits.

Stripping and processing of terrace gravel deposits containing high percentages of cemented clay.

Remote off-grid mining sites utilizing containerized diesel generator power packs.

Trommel Configuration

Cylinder Diameter

1,000 mm to 2,500 mm available based on required volumetric feed rate.

Length-to-Diameter Ratio

Maintained at 3:1 to ensure adequate retention time for clay disintegration and complete particle stratification.

Rotation Speed

Variable frequency drive (VFD) controlled from 12 RPM to 22 RPM, adjustable to match feed density and rock hardness.

Inclination Angle

Fixed at 4 to 6 degrees to maintain optimal slurry forward velocity without overloading the discharge end.

Screening & Drive Options

Screen Media

Perforated steel plates for coarse primary sizing; polyurethane modular snap-in panels for fine classification and extended wear life.

Drive Arrangement

Direct gearmotor drive via hollow-shaft planetary reducers, or traditional heavy-duty roller chain and sprocket transmission with safety guards.

Power Source

380V/415V/480V 3-phase industrial electric motors or integrated diesel generator enclosures for remote field deployment.

Secondary Recovery

Integration of automatic pulse sluice boxes or batch centrifugal concentrators for upgraded concentrate processing.

Manufacturing & Quality Control

Quality Framework & Certification: Manufactured under ISO 9001 quality management systems, with complete technical compliance documentation provided for international trade and site safety audits.

Plate Cutting: CNC plasma and laser cutting machines maintain dimensional tolerances within +/-0.5 mm on all structural frame components.

Welding Standards: All structural load-bearing welds undergo mandatory ultrasonic testing (UT) and magnetic particle inspection (MPI) by certified welding inspectors.

Surface Preparation: Structural steel undergoes abrasive blast cleaning to Sa 2.5 standard prior to the application of a high-build epoxy zinc-rich primer and polyurethane topcoat.

No-Load Factory Run: Every assembled trommel and drive assembly undergoes a continuous 4-hour mechanical test run to verify bearing temperature limits, vibration levels, and drive alignment before dispatch.

Customization

Tailored feed hopper volumes ranging from 5 m3 to 30 m3 to accommodate excavator bucket loading cycles.

Customized water pump and piping packages matched to static head and water source distance (river abstraction or borehole).

Addition of rock trommel oversize conveyors for continuous sterile material stacking away from the plant footprint.

Arctic weather packages incorporating insulated electrical control cabins and heat-traced water lines for sub-zero operating environments.

Frequently Asked Questions

Q: How does the trommel handle high-clay-content feed without losing fine gold?

A: Internal helical scrubber bars lift and drop sticky clay aggregates against the shell wall, while internal high-pressure water jets disintegrate the mud matrix before it reaches the screen panels. This mechanical scrubbing releases entrapped gold flakes, preventing them from being carried out with the oversized waste rock.

Q: What is the typical gold recovery rate for this plant?

A: Overall recovery ranges from 85% to 95% for free gold particles larger than 75 microns (200 mesh), depending on the feed mineralogy, particle shape, and operator maintenance of the sluice riffles or centrifugal bowls.

Q: Can the plant run on generator power in remote off-grid locations?

A: Yes. Total electrical load requirements range from 30 kW to 110 kW depending on plant capacity and pump selection. Matching diesel generator sets complete with weather-resistant sound-attenuated enclosures can be integrated.

Q: What site preparation is required prior to plant installation?

A: The modular skid frame requires a relatively level, compacted gravel pad capable of supporting the static and dynamic operating load (typically 15 to 45 tonnes total wet weight). No heavy concrete foundation pouring is necessary, allowing relocation within 3 to 5 days.

Q: How are replacement wear parts sourced and replaced?

A: High-wear components—such as trommel screen panels, rubber riffle mats, and pump impeller liners—use bolt-on or modular pin-lock connections. Standard wear items are stocked regionally, and replacement intervals are detailed in the O&M manual based on feed abrasiveness.

Q: What data is required to get an accurate equipment quotation?

A: Provide your target processing capacity (TPH or m3/h), maximum boulder size, clay percentage in the raw feed, available water supply source, and power preference (grid or diesel).

Zhengzhou Sinolion Machinery Co., Ltd. is well-known as one of the leading alluvial gold washing plant manufacturers and suppliers in China, featured by quality products and competitive price. If you're going to buy alluvial gold washing plant for sale, welcome to get more information from our factory.

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