A hand crank drywasher is a compact, manual alternative to traditional gold recovery equipment, ideal for arid regions where water is scarce. This DIY design focuses on portability and efficiency, using lightweight materials like aluminum or PVC.
Key Components:
– Hopper: Holds raw material (approx. 5–10 kg capacity).
– Screening Mesh: 1/4″ mesh for initial gravel separation.
– Bellows System: Manual crank-driven airflow to separate gold from lighter debris.
– Riffle Tray: Angled tray with matting to trap heavy particles.
For larger-scale operations, a complete sand and gravel production line includes:
1. Jaw Crusher (Primary Crushing): Processes raw rock (e.g., granite/basalt) into 150–300mm fragments.
2. Cone Crusher (Secondary Crushing): Reduces material to 20–50mm.
3. Vibrating Screen: Classifies aggregates into 0–5mm (sand), 5–20mm, and 20–40mm grades.
Sample Equipment Parameters:
| Model | Capacity (t/h) | Power (kW) | Output Size (mm) |
|————–|—————-|————|——————|
| JC5460 Jaw | 150–350 | 110 | 150–300 |
| HPT300 Cone | 100–200 | 250 | 20–50 |
Q1: Can a drywasher replace a water-based sluice?
A: Only in dry climates; water-based systems yield higher recovery rates.
Q2: What’s the lifespan of a cone crusher’s mantle?
A: Typically 500–1,000 hours, depending on abrasiveness of feed material.
A quarry in Arizona upgraded to an automated crushing line (jaw + cone + VSI crushers), increasing output by 40% to 500 t/h while reducing energy use by 15%. Key to success was pre-screening to remove fines before secondary crushing.
Note: DIY
