Electric-pulse disaggregation (EPD) is a comminution technique that liberates all mineral grains from any rock type, irrespective of its lithology or grain size distribution. Normal mechanical crushing of whole-rock samples is replaced by the effect of an explosion, which is produced by applying an electric current from a high-voltage power source. The sample sits under water in a special crushing-chamber of an original design and construction (SPARK-2, CNT, Russia). The rapid distribution of electric pulses through the sample leads to explosions, which occur preferentially along grain boundaries (zones of weakness). As a result, individual, undamaged mineral grains can be liberated and recovered in their original shape and form regardless of grain size.
- High selectivity of the crushing process that produces an effective separation of mineral grains and crystals from the host rock.
- Retention of the natural unbroken shape and original size of desired mineral grains/crystals.
- The possibility of rapidly crushing rocks of any density and mechanical hardness.
- Low possibility of contamination of final crushed product by outside material due to easy cleaning of the crushing chamber.
- Good control of the grain-size distribution of the crushed product.
| # | Parameter | Units | Rate |
|---|---|---|---|
| 1. | Sample quantity per chamber loading (kg) | kg | up to 15 |
| 2. | Maximum sample size | cm | 15x10x20 |
| 3. | Maximum particle size of the crushed products | mm | <1 up to 20 |
| 4. | Voltage required | V | 220-380 |
| 5. | Alternating current frequency | Hz | 50-60 |
| 6. | Power consumption | kW/hour | < 2 |
| 7. | Overall dimensions (height/width/depth) | cm | 200/100/200 |
| 8. | Weight of installation without safety grid | kg | < 300 |
| 9. | Water consumption per sample | litres | 40 |
| 10. | Productivity | kg/hour | from 10 to 300 |
| 11. | Hours of continuous operation per day | hours/day | 16 |
| 12. | Working temperature range | °C | from +10 to +30 |
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