Depleted Brine Concentration

Highlights

Concentration of depleted brine from typically 190 g/l to 310 g/l:

• Na₂SO₄ can be removed by crystallization and filtration
  
• Sodium iodide can be extracted selectively
  

Feedstocks

Depleted brine from chlor-alkali plants – all concentrations

Process Characteristics

1. Split feed to reduce equipment size
   
2. Na₂SO₄ discharged as solid to minimise NaCl losses
3. NaClO₃ discharged in purge
   
4. Exact control of return brine concentration
   
5. High plant availability