High Thickening Nozzle Separator 4500rpm Continuous Starch Processing

The Nozzle Separator Centrifuge is a purpose-built disc stack centrifuge for the starch processing industry, delivering exceptional thickening performance for corn starch, wheat starch (gluten), potato starch, and cassava starch concentration. With a proven high thickening ratio of up to 15:1 and improved material recovery rate exceeding 96%, this machine dramatically reduces product loss and downstream dewatering costs.

It features an optimized bowl geometry with a 420mm diameter disc stack that maximizes the effective settling area while minimizing shear forces that could damage starch granules. The continuous non-stop solids discharge through peripheral nozzles ensures zero feed interruption during operation, maintaining consistent product quality and eliminating the productivity losses associated with intermittent discharge cycles. The duplex stainless steel construction provides excellent resistance to process water containing sulfur dioxide (commonly used in corn wet milling), extending service life in demanding starch plant environments.

Key advantages include: high thickening ratio for reduced downstream dewatering energy costs, improved material recovery minimizing valuable starch loss to waste streams, continuous operation without production stops, wear-resistant nozzle inserts in tungsten carbide for extended service intervals, and a robust bearing assembly rated for 25,000+ hours of continuous service.

• Corn Wet Milling: Concentration of corn starch slurry after the primary separation stage, reducing gluten content and increasing starch purity to >99.5%
• Wheat Starch & Gluten Processing: Separation and concentration of A-starch and B-starch fractions, with simultaneous gluten dewatering for vital wheat gluten production
• Potato Starch Extraction: Continuous concentration of potato starch milk from rasping and extraction stages, improving yield by capturing fine starch granules
• Cassava/Tapioca Starch: Starch slurry thickening prior to dewatering, reducing the load on vacuum filters or peeler centrifuges
• Modified Starch Production: Washing and concentration of chemically or enzymatically modified starch slurries with precise pH and temperature control

The Separator utilizes centrifugal sedimentation within a high-speed rotating disc stack to separate starch granules from the liquid phase based on density difference. The feed slurry enters the bowl center and is distributed through the disc stack, where each disc provides a large settling surface area within a compact volume. The heavier starch granules (density ~1.5 g/cm³) sediment on the upper surfaces of the discs and slide outward, while the lighter liquid (process water with solubles) flows inward toward the center.

The concentrated starch solids continuously exit through precision-calibrated nozzles at the bowl periphery. The nozzle diameter is selected to match the solids loading rate, ensuring the bowl maintains optimal filling without overloading. This continuous discharge mechanism allows the separator to operate 24/7 without interruption for sludge ejection. The clarified overflow (containing soluble proteins, fibers, and process water) exits via a centripetal pump at the top and can be sent to further treatment or recycled.

The high thickening ratio is achieved through the combination of high centrifugal force (4,800 G), optimized disc spacing (0.4-0.6 mm), and precisely sized discharge nozzles that retain solids in the bowl until the desired concentration is reached.

1. Characterize Feed Material: Determine starch type, feed concentration (typically 2-15% dry substance), particle size distribution (2-100 μm for most starches), and process temperature (typically 30-45°C).
2. Define Production Goals: Specify required throughput, target discharge concentration, and acceptable starch loss in the overflow. These drive the machine sizing and nozzle configuration.
3. Evaluate Process Chemistry: Consider pH (typically 3.5-6.5 for corn wet milling), SO₂ content (corrosion concern), and any process additives that may affect material selection.
4. Upstream/Downstream Integration: The separator should be positioned after the primary hydrocyclone stage and before dewatering (vacuum filter or peeler centrifuge). Ensure buffer tank sizing accommodates continuous operation.
5. Material Selection: SS304 is adequate for most starch applications. For high-SO₂ environments or low-pH modified starch processes, duplex stainless steel is recommended for superior pitting resistance.
6. Request a Pilot Test: For large-scale projects, we recommend a pilot-scale test using your actual process slurry to validate separation performance and optimize nozzle configuration before full-scale deployment.