A Screw Sand Washing Machine is a type of equipment used to wash, classer, and dewater sand and other granular materials in industries like mining, construction, et carrières. It utilizes a screw mechanism to lift and clean the material while removing impurities.

Principales fonctionnalités & Principe de fonctionnement:
1. Structure:
- Consists of a rotating screw (auger) inside a trough or tub.
- Water inlet for washing and an overflow weir for removing impurities.

2. Working Process:
- The screw rotates, lifting sand from the bottom of the tank.
- As the sand moves upward, it is washed by water jets or immersion.
- Impuretés (argile, poussière, matière organique) are flushed out through the overflow weir.
- Clean sand is discharged at the top after dewatering.

3. Avantages:
- Efficient cleaning & high recovery rate (95%+).
- Low water consumption compared to bucket-wheel washers.
- Simple structure with minimal maintenance needs.
- Handles fine and coarse sand effectively.

4. Applications:
- Washing natural sand or crushed sand for construction (béton, mortier).
- R.

ving silt/clay from aggregates in quarries.
- Traitement des minéraux (par ex., minerai de fer, sable de silice).

Types of Screw Sand Washers:
- Single Screw Washer: One spiral for small-scale operations.
- Double Screw Washer: Two parallel screws for higher capacity.

Comparison with Other Sand Washers:
| Fonctionnalité | Screw Washer | Bucket Wheel Washer | Laveuse de bûches |
||-|||
| Utilisation de l'eau | Faible | Haut | Modéré |
| Fines Loss | Minimal | Plus haut | Modéré |
| Capacité | Moyen | Haut | Haut |
| Entretien | Faible | Modéré | Haut |

Selection Considerations:
- Type de matériau (taille, teneur en argile).
- Required Output (tonnes/heure).
- Water Availability & Recycling System.

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