High-efficiency static melt and solution crystallization for seawater, industrial and refined salt production lines.

Pillow-plate static crystallizers deliver controlled temperature profiles and stable cycles to produce high-purity salt crystals with a compact footprint and reduced energy use. They are well suited for upgrades of medium to large salt plants.

Two metal sheets are laser-welded and hydraulically inflated to form “pillow" channels. Brine contacts cooled or heated surfaces so that supersaturation drives crystal growth. The wavy channels enhance turbulence and heat transfer, while smooth external faces simplify cleaning.

• Plant target: ~300 t/day refined sea salt (plant-level).
• One 20–25 m³ static melt crystallizer with double-embossed plates.
• Materials: 316L or SMO-254 depending on chloride and impurity load.
• Plate thickness: ~1.2–1.5 mm per side; laser-welded; pickled & passivated contact surfaces.

Final sizing must be validated via pilot tests with actual mother liquor (impurities such as Ca, Mg, Fe strongly influence kinetics and fouling).

• High heat-transfer area and turbulence within pillow channels.
• Compact layout and reduced footprint compared with open ponds.
• Controllable crystal size through temperature/hold-time control.
• Easy cleaning; passivation or coatings extend service life.
• Broad material options for corrosive brines.

Integrating a Mechanical Vapor Recompression (MVR) evaporator can substantially reduce thermal demand for salt crystallization lines, with many systems operating primarily on electricity after start-up.

• Platecoil® case: Static Melting Crystallizer Made with Pillow Plates — verified specs and image.
• Platecoil® case: Pillow Plate Type Static Melting Crystallizer for Chemicals — verified specs and image.
• DAV Pillow: How it is made — manufacturing process, materials, thickness ranges, engineering notes.
• MVR background: Manufacturer notes on energy reduction for evaporation systems.

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