Crystallizers

Rototech Engineering Systems is a leading manufacturer of Salt Recovery Crystallizers, offering advanced and energy-efficient systems designed for high-purity salt recovery from industrial effluents and brine solutions. Our crystallizers are engineered for optimal solids separation, reduced energy consumption, and maximum recovery of valuable salts.

• High-purity salt recovery from wastewater and saline streams

• Continuous operation with stable crystal formation

• Low power consumption with efficient heat integration

• Corrosion-resistant construction for long-lasting performance

• Compact and modular design for easy installation and maintenance

• Zero Liquid Discharge (ZLD) systems

• Chlor-alkali industries

• Desalination plants

• Chemical and fertilizer industries

• Textile and dye industries

At Rototech Engineering Systems, we specialize in custom-engineered crystallization solutions to suit diverse industrial needs. Our Salt Recovery Crystallizers are built with cutting-edge technology and robust materials, ensuring consistent output, long service life, and environmental compliance.

Trust Rototech Engineering Systems for your salt recovery requirements – delivering quality, performance, and innovation every time.

An ATFD (Agitated Thin Film Dryer) is a type of industrial dryer used to convert concentrated liquid or slurry into dry powder or flakes, especially when dealing with heat-sensitive, viscous, or high-solids materials. It is often the final stage in a Zero Liquid Discharge (ZLD) system after a Multi Effect Evaporator (MEE).

1. Feed Input: Concentrated slurry (typically from an MEE) enters from the top of the ATFD.

2. Rotor with Blades: A rotating shaft with blades spreads the slurry into a thin film along the heated cylindrical wall.

3. Heat Transfer: The shell is externally heated (usually by steam, oil, or electric heaters). The thin film increases heat transfer and promotes quick evaporation of remaining moisture.

4. Drying: As water evaporates, solids are left behind.

5. Powder Discharge: The dry material is continuously scraped and collected from the bottom as powder, flakes, or granules.

• Effluent or brine drying in ZLD plants

• Pharmaceuticals – drying APIs or intermediates

• Chemicals – dyes, pigments, resins

• Food industry – spices, extracts, proteins

• Textiles – dye sludge

• SS316, SS304, Hastelloy, or Titanium – based on corrosiveness of feed

• May include:

  • Jacketed shell for heating

  • Rotary mechanical seal

  • Vapour outlet (to condenser or scrubber)

• Feed solids concentration (usually 25–40% before entering ATFD)

• Dryer size based on feed rate (litres/hour)

• Shell temperature (typically 120–160°C)

• Rotor speed (variable frequency drives often used)

• Vacuum operation (optional, for sensitive materials)