Potassium Chloride
Potassium chloride, commonly known as Potash, is produced by vacuum cooling saturated brines of various compositions and is a key fertilizer for the agricultural industry. Coarse crystals are produced in multi-stage Draft Tube-Baffle crystallisers which ensures a narrower particle size distribution.
Related Technologies
Flash Evaporation / Crystallisation
Draft Tube-Baffle Crystalliser (DTB)
Recrystallisation
Value
- Multiple stage arrangement improves heat recovery
- High quality condensate recovered (in recrystallisation applications)
- Control of magma density leads to longer on-stream availability
- Slow moving internal circulation propeller in the DTB minimises attrition of the crystals
- Simple controls minimize co-crystallisation of Sodium Chloride
Process
- Hot saturated feed is flash cooled stage-wise
- Surface condensers used to recover heat from flash vapours
- FC or DTB configuration used depending on crystal size requirement
- Centrifugation separates the crystals from the end brine
- Dryer / cooler achieves desired moisture level in product
- In some cases product compaction is employed
Flow Diagram
Internals of a Heating Chamber
Heating Chamber for a Potassium Chloride Crystalliser
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