Expansion Efficiency
Expansion Efficiency — Expansion Ratio, Porosity Formation & Process Optimization
Expansion efficiency measures how much raw ore volume increases during expansion. Typical ratios: 8–15×.
1. What Is Expansion Efficiency?
Defined as:
Expansion Ratio = Expanded Volume / Raw Ore Volume
2. Typical Values
| Ore Quality | Expansion Ratio |
|---|---|
| High | 12–15× |
| Medium | 10–12× |
| Low | 8–10× |
3. How Efficiency Is Measured
- Bulk density
- Porosity
- Cell structure
- LOI
4. Factors Affecting Efficiency
- Bound water
- Furnace temperature
- Heating rate
- Ore chemistry
5. Impact on Final Product
- Density
- Strength
- Thermal conductivity
6. Geological Influence
Hydrated rhyolitic glass → highest efficiency.
7. FAQ
Q: Does higher LOI increase expansion?
Yes.
Q: Can efficiency be improved?
Only by process control.
