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

Key Features & Working Principle:
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.
- Impurities (clay, dust, organic matter) are flushed out through the overflow weir.
- Clean sand is discharged at the top after dewatering.

3. Advantages:
- 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 (concrete, mortar).
- R

ving silt/clay from aggregates in quarries.
- Mineral processing (e.g., iron ore, silica sand).

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:
| Feature | Screw Washer | Bucket Wheel Washer | Log Washer |
||-|||
| Water Usage | Low | High | Moderate |
| Fines Loss | Minimal | Higher | Moderate |
| Capacity | Medium | High | High |
| Maintenance | Low | Moderate | High |

Selection Considerations:
- Material Type (size, clay content).
- Required Output (tons/hour).
- Water Availability & Recycling System.

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