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