Raw Brine Treatment
Brine purification removes calcium and magnesium from the evaporator feed, improving the on-stream factor of the evaporator, and the purity of the final product.
Value
- Improved purity of the salt product
- Extended lifetime of plant equipment
- Reduced energy consumption in the evaporation process
- Fewer cleaning cycles
- Low sodium carbonate consumption
- Optimization of mother liquor recycle
General Process
- Reactive precipitation of calcium carbonate and magnesium hydroxide
- Reactants are sodium hydroxide and sodium carbonate
- Can be conducted as a batch or continuous process
- Optimum design for sedimentation, thickening and filtration
| MgSO₄ | + 2 NaOH | → | Mg(OH)₂↓ | + Na₂SO₄ |
| CaCl₂ | + Na₂CO₃ | → | CaCO₃↓ | + 2 NaCl |
Schweizerhalle Process
- Chemicals used: calcium oxide or hydroxide, carbon dioxide, sodium carbonate
- Sodium hydroxide is no longer needed
- Carbon dioxide replaces the more expensive sodium carbonate
- Conducted as a batch process
| MgSO₄ | + Ca(OH)₂ | → | Mg(OH)₂↓ | + CaSO₄ |
| Na₂SO₄ | + Ca(OH)₂ | → | 2NaOH | + CaSO₄↓ |
| 2NaOH | + CO₂ + CaSO₄ | → | CaCO₃↓ | + Na₂SO₄ + H₂O |
Flow Diagram
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