A spiral sand washer cleans and dewaters granular material by combining a water-filled washing trough with a rotating screw. The screw agitates the feed so clay, silt, and other fine contaminants can separate from coarser sand; it then moves the retained material toward the discharge end. Wash water carries suspended fines to an overflow, while the cleaned sand is discharged for further handling.
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In practical terms, the result depends on the feed material, water conditions, machine configuration, and operating settings. The machine does not make every feed suitable for every product specification, so buyers should assess representative material and define their required output before selecting a model. Below, we explain the process step by step and identify the decisions that most affect performance.
Sand or another suitable granular feed is delivered into the washer’s trough, commonly as a mixture containing solids and water. The feed should be distributed consistently rather than arriving in irregular surges, because changing feed conditions can affect the washing and conveying process. Upstream screening or classification may be needed when the feed contains oversized material or a broad range of particle sizes.
Before selecting a machine, describe the feed in measurable terms. Useful information includes the expected solids throughput in tonnes per hour, the particle-size distribution, the proportion of fines, and whether the material contains sticky clay or other contaminants. A particle-size unit conversion can help keep specifications clear: 1 millimetre (mm) equals 1,000 micrometres (µm).
A motor and drive rotate the spiral blade inside the trough. As the screw turns, it stirs and moves the material through the wash zone, helping water contact the sand and loosen removable surface dirt or fine particles. The intensity of washing depends on the machine’s design and settings as well as the nature of the feed.
This action is not the same as dissolving or chemically treating contaminants. A spiral washer is generally used for physical washing and separation, and its effectiveness can be limited when contaminants are strongly bonded to particles or when clay is highly cohesive. If the target product requires a specific cleanliness level, validate the process with a representative sample rather than relying on the equipment name alone.
During agitation, lighter suspended fines can remain in the water while coarser particles settle in the trough. Water carrying suspended material moves toward the overflow and exits the washing zone. The overflow is therefore part of the separation process, not simply excess water to discard without consideration.
Actual separation depends on particle size, particle density, water conditions, and the equipment configuration. The overflow may require downstream collection, clarification, or water-reuse equipment depending on site rules and process needs. Ask the supplier what information is required to assess a complete washing and water-management arrangement.
As the spiral continues turning, it pushes settled sand along the trough toward the discharge point. The material drains as it travels, so the discharged product is typically dewatered compared with the incoming slurry, although its moisture level depends on operating and material conditions. Any further drying or moisture control should be evaluated as a separate process requirement.
For a simple production calculation, continuous operation at 1 tonne per hour would correspond to 24 tonnes over 24 hours, before allowing for downtime or changes in feed. This is a unit conversion, not a capacity claim for any particular washer. Confirm the machine’s rated throughput and the basis of that rating with the manufacturer.
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Start with the material rather than choosing equipment from a capacity figure alone. Share feed gradation, estimated fines and clay content, moisture condition, and any known contaminants with the supplier. Then state the intended product use and the cleanliness or grading requirements that must be achieved.
Where possible, provide representative samples or reliable test results. A nominally similar sand can behave differently if its particle distribution or clay content differs, so sample-based evaluation is more informative than a general product description. If the project involves multiple feed sources, explain how much those sources vary over time.
Throughput should be discussed alongside feed characteristics and the desired product quality. A target stated in tonnes per hour is useful, but it does not by itself establish that a specific configuration will meet the requirement. Ask whether the supplier’s proposed capacity refers to dry solids, wet feed, or another defined operating basis.
Clarify available water supply, water quality, drainage, and the planned route for overflow. For practical communication, 1 cubic metre per hour (m³/h) is equivalent to 1,000 litres per hour (L/h). This conversion helps compare water-flow requirements across documents, but the necessary flow rate must be determined for the selected machine and process.
Keep the feed as consistent as practical and avoid sudden changes in feed rate. Inspect the feed before it reaches the washer, and use suitable upstream screening or classification where oversized material could interfere with the intended process. Maintain a record of the feed condition, operating settings, water supply, and product observations so adjustments can be evaluated against comparable conditions.
When the washed product does not meet expectations, identify the cause before changing multiple settings at once. Check whether the issue is associated with feed variation, insufficient washing action, water conditions, overflow behavior, or a mismatch between the machine and the required separation. Discuss findings with the supplier and agree on a controlled way to verify adjustments.
As a mining machinery manufacturer, supplier, and exporter, DAHONGLI can discuss spiral sand washer selection in relation to project requirements. To make an inquiry useful, provide your feed material, target throughput, particle-size information, contamination concerns, water availability, and required product outcome. Include site constraints and the planned connection to upstream and downstream equipment when available.
We recommend confirming the proposed configuration, operating basis, utilities, wear-part requirements, and scope of supply in writing before placing an order. Where application performance is uncertain, ask what material information or sample evaluation is needed to support the selection. This helps both parties assess suitability without assuming that one standard configuration fits every project.
A spiral sand washer works by agitating feed in water, allowing removable fines to separate into the overflow, and conveying settled sand toward a drained discharge. It may suit a project that needs physical washing and dewatering of compatible granular material, but the outcome depends on feed properties, water management, and the required product specification. No single throughput or performance figure should be treated as universal.
Your next step is to document the feed gradation, fines and clay conditions, target tonnes per hour, water supply, and product requirements. Share those details with DAHONGLI to discuss a suitable configuration and clarify the information needed to verify it. A well-defined application is the most practical starting point for choosing a spiral sand washer.
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