Fractional Crystallisation
Defined as the selective separation of different compounds which may co-exist in an aqueous solution, Fractional Crystallisation increases the recovery efficiency of a plant. The separate production of sodium chloride and sodium sulphate, or of sodium chloride and potassium chloride, are cases of Fractional Crystallisation.
Related Technologies
Multiple Effect Evaporator (MEE)
Mechanical Vapour Recompression (MVR)
Thermal Vapour Recompression (TVR)
Flash Evaporation / Crystallisation
Value
- Generation of high-quality end products from the purge of the main sodium chloride production plant maximises revenue (for example the recovery of sodium sulphate in a salt plant)
- Processing of SRS purge liquors to recover sodium sulphate and recycle sodium chloride
- Applied to solution mining, Fractional Crystallisation reduces mining and feed treatment costs
- These processes also result in reduced chemical consumption and smaller plant size, lowering the overall plant costs
- The application of advanced concepts drastically reduces final purge output and disposal costs
Process
- The method of separation depends on the mutual solubility of the compounds involved
- All types of crystallisation equipment may be employed (Multiple Effect Evaporation, Mechanical Vapour Recompression, Thermal Vapour Recompression, Flash Evaporation/ Crystallisation)
- Generally, the separations occur in series; the purge of the first separation may be the feed to the second
- Centrifuges or filters are utilised for separation of the product crystals
Flow Diagram
Combined Sodium Chloride and Sodium Sulfate Plant
Turbo Compressor
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