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Raw Brine Treatment

Highlights

Brine purification improves the brine quality upstream of a salt crystallisation plant. By means of chemical treatment a brine is obtained which is nearly free of calcium and magnesium which can be produced and fed directly into the evaporation process.


This brine purification process leads to an efficient use of process chemicals.


Advantages for the plant operator

  1. Improved purity of the salt product 
  2. Extended lifetime of plant equipment 
  3. Reduced energy consumption in the evaporation process 
  4. Fewer cleaning cycles

MgSO₄

+ Ca(OH)₂

Mg(OH)₂↓

+ CaSO₄

Na₂SO₄

+ Ca(OH)₂

2NaOH

+ CaSO₄↓

2NaOH

+ CO₂ + CaSO₄

CaCO₃↓

+ Na₂SO₄ + H₂O

Features of the Process

  • Chemicals: CaO, CO₂, Na₂CO₃
  • Minimum soda consumption
  • NaOH no longer needed
  • Significant soda savings due to caustification reaction combined with CO₂ addition
  • Most efficient for brines with high sulphate content or mother liquor recirculation
Pumping Station for Chemical Additives
Pumping Station for Chemical Additives
Brine Purification Plant
Brine Purification Plant

Flow Diagram

 
 

SEP Salt & Evaporation Plants Ltd
Neuwiesenstrasse 69
CH-8400 Winterthur
Switzerland

Phone +41 52 260 50 70
Fax      +41 52 260 50 80
info@sepwin.ch