Re-Crystallisation of Raw Salt to High Quality NaCl
Highlights
Re-crystallising rock salt or solar salt is a very energy efficient means of producing high quality vacuum salt characterised by:
1. Minimal Steam Consumption
- Raw salt dissolved at high temperature
→ Evaporation load reduced
- Thermo compression (ejectors)
→ Less live steam required
- Number of stages → Less live steam required
2. High Product Purity
- Low grade raw salt
→ Is converted to high quality product
- Fluctuations in raw salt composition
→ Have minimum impact upon product quality
- No brine purification required
→ Lower operating costs
3. Low Scaling
- Direct contact preheaters
→ No heat transfer surfaces
- Flash / cooling evaporators
→ No heat transfer surfaces
Plant Characteristics
- Production capacities up to 250’000 tons / year
- Advanced concepts to minimise operating costs
- Plants can be designed for a wide range of raw salt compositions
- No thickener needed – centrifuge fed directly from salt leg

Circulation Pump