Sand and Gravel Washing Equipment for Mining

Designed for use in sand aggregate production lines, the Sand and Gravel Washing Equipment for Mining supplied by Qingzhou Mingxu Supply Chain is intended to clean manufactured sand, river pebbles, limestone, and mine tailings. The machine combines an enlarged deep water tank with two rows of large-diameter wear-resistant wheel buckets to separate mud, stone powder, and other impurities from the sand.

The frame is built from thickened carbon steel, and the inner surfaces are protected by wear-resistant alloy lining plates. A heavy-duty reducer drives the wheel buckets, and the design helps keep fine sand loss low during continuous operation. The unit is available for bulk purchase by sand plants and concrete mixing stations.

Technical Specifications

Design Features

1. Dual wheel buckets for higher capacity. Two wheel buckets work simultaneously, providing greater throughput than single-wheel designs and supporting medium to large sand production lines.

2. Effective mud separation. The deep water tank allows full soaking and continuous friction between sand particles, which helps dislodge mud and stone powder more thoroughly than shallow-tank configurations.

3. Reduced fine sand loss. The bottom of the tank includes a settling zone where fine sand particles are captured and collected by the wheel buckets instead of being discharged with the overflow water.

4. Durable construction. The wheel buckets and lining plates are cast from wear-resistant alloys, and the frame is made from thickened carbon steel to extend the replacement cycle of major components.

5. Stable drive system. The heavy-duty reducer delivers steady torque with low vibration, contributing to lower failure rates and reduced energy consumption during long production runs.

6. Customizable configuration. Wheel diameter, tank dimensions, and motor power can be adjusted to fit the available space and production target of the customer's site.

Mud Water Separation and Fine Sand Retention

During the washing process, mud and stone powder are dispersed into the water and carried out through the overflow weir. The tank bottom is shaped to create a low-flow settling area where fine sand particles settle and are picked up by the rotating wheel buckets. This configuration limits the loss of fine sand that would otherwise leave with the wastewater, improving the overall sand recovery rate. The design also allows process water to be recirculated after settling in a separate pond or water treatment unit, which reduces fresh water consumption for operations in water-scarce regions.

Customization and Site Adaptation

The Sand and Gravel Washing Equipment for Mining can be configured to match the desired production capacity and the physical layout of the site. Wheel bucket diameter, tank width, and drive power are selected according to the expected feed rate and washing requirements. For high-capacity operations, multiple washers can be installed in parallel, or the unit can be combined with dewatering screens, fine sand recovery systems, and belt conveyors to form a complete washing circuit. Process flow diagrams and layout drawings can be provided during the planning stage to help customers integrate the equipment into their existing production line.

Washing Process

The water tank is filled with clean water before operation. Raw sand aggregate enters the tank and is fully soaked. Driven by the motor and reducer, the two large wheel buckets rotate slowly, and their wear-resistant blades continuously stir and lift the material. Sand rubs against itself in the water, dislodging mud and stone powder, which are carried out through the overflow outlet. Clean sand is lifted by the rotating buckets and discharged onto a conveyor belt. The sediment trap at the tank bottom helps retain fine sand during this process, completing the washing, mud removal, and grading cycle.

Operating Instructions

1. Before startup: Check the motor, drive chain, and lining plates for damage. Remove debris from the tank and fill with clean water to the required level.

2. Startup: Run the machine without load for a short period to confirm normal operation. Begin feeding material only after no abnormal noise or vibration is observed.

3. Operation: Maintain steady material feeding and adjust the water supply according to the mud content of the feed. Inspect the wheel buckets and overflow outlet regularly during production.

4. Shutdown: Stop feeding first, then flush remaining sludge from the tank before turning off the machine and water supply. Disconnect power after the machine has come to a complete stop.

5. Safety: Keep away from the rotating wheel buckets during operation. Always cut off power before carrying out maintenance or inspection work.

Typical Applications

1. Manufactured sand production: washing and purifying sand produced by crushing to remove stone powder and mud, improving final sand quality.

2. Concrete batching plants: cleaning sand and aggregate before use to maintain concrete strength and consistency.

3. Road and bridge construction: washing aggregate for highway, national road, bridge, and tunnel projects.

4. River sand mining: separating sediment and impurities from river-mined sand.

5. Mining auxiliary processing: removing mud and purifying crushed ore tailings.

6. Solid waste recycling: washing crushed construction waste and leftover stone material for reuse.

7. Stone processing plants: cleaning crushed stone and slabs to meet building material sales requirements.

Warranty and Support

The main structure and drive components are covered by a 12-month or 1,000-working-hour warranty, whichever occurs first. Wear items such as wheel bucket blades and lining plates are not included. Replacement parts can be supplied; shipping and installation costs are the customer's responsibility.

FAQ

Q1: What is the difference between a single wheel and a double wheel sand washer?
A1: A double wheel sand washer has two wheel buckets working in parallel, which increases the washing capacity for the same footprint. It is generally selected for medium and large production lines where higher throughput is required. A single wheel unit may be sufficient for smaller operations.

Q2: How is fine sand loss controlled in this machine?
A2: The bottom of the water tank includes a sediment trap structure that allows fine sand to settle and be collected by the wheel buckets rather than flowing out with the overflow water. The actual fine sand recovery rate depends on the feed material characteristics and water flow settings.

Q3: What maintenance is required for continuous operation?
A3: Daily checks include inspecting the wheel bucket blades for wear, monitoring the reducer oil level, and cleaning the overflow outlet to prevent clogging. The water tank should be flushed regularly to remove settled mud. Spare blades and lining plates should be kept on site for long production runs.

Q4: Can the washer handle feed material with very high mud content?
A4: Yes, the deep water tank and double wheel design are suited to feed with moderate to high mud content. However, for extremely sticky clay, a pre-screening or attrition scrubber may be recommended before the washing stage to avoid excessive load on the wheel buckets.

Q5: Is the machine configurable for different site dimensions?
A5: Yes. Wheel bucket diameter, tank width, and motor power can be adjusted during the order stage to fit the available space and expected production volume. For larger installations, multiple washers can be arranged in parallel or combined with dewatering screens and conveyors.