Horizontal Spiral Screen Centrifuge
Introduction
The Horizontal Spiral Screen Centrifuge is an automated continuous solid-liquid separation system that integrates feeding, filtration, cake washing, dewatering, and cake discharge into a single uninterrupted process.
It is engineered to serve high-volume liquid-solid separation requirements in chemical, pharmaceutical, and industrial processing operations.
Process Applications
Abrasive Acidic Salt Recovery: Handling Ammonium Sulfate, Ammonium Chloride, and Sodium Sulfate (Glauber's Salt) from waste streams requiring duplex or nickel-based wetted alloys to withstand continuous abrasion and corrosion.
Fine Crystalline Organic Acid Dewatering: Dewatering Citric Acid, Oxalic Acid, and Tartaric Acid with controlled screen slot mesh sizes to minimize crystal breakage and solid loss in the filtrate.
Polymer Resin Dewatering: Dewatering of PVC, PVA, and PE resin slurries, where the low-speed scroll conveys the cake without heavy compaction.
Viscous Salt Stream Processing: Recovering mixed salts (such as ammonium thiocyanate and sodium chloride) from high-viscosity industrial waste streams using low differential speed setups and hydraulic drives.
Separation Performance
Particle Size: Crystalline and granular solids of 0.05–10 mm, with best results at 0.15–3 mm. Particles below 0.1 mm should not exceed about 10% by weight.
Feed Solids: 20–70 wt% by weight; best at 30–60 wt%. Below 20 wt%, pre-thickening with a hydrocyclone or thickener is recommended to avoid fines loss through the screen.
Filtration Efficiency: Liquid filtrate clears the screen openings continuously while retained solid particles form a cake bed for rapid dewatering.
Displacement Washing: Integrated wash fluid lines allow liquid displacement washing directly on the cake bed before final solids discharge.
Slurry Distribution Control: Internal feed pipe distributes incoming slurry across the internal cavity to prevent localized weight imbalance.
technical parameters
Note: Our company can customize production according to user requirements.
Discharge System Design
Pusher Spiral Conveying: Internal screw conveyor moves separated solids axially along the tapered screen drum toward the discharge chute.
Hydraulic Differential Option: Optional hydraulic differential gear supports high-viscosity or heavy solids loading by delivering stable torque under variable feed conditions.
Zero-Speed Protection Option: Optional zero-differential speed monitoring can be integrated to trigger an automatic system response if spiral rotation relative to the drum drops below set limits.
Solid Cake Discharge: Conveyed filter cake exits continuously through the front discharge hopper under mechanical force.
Wetted Material Selection
- Austenitic Stainless Steel: 316L stainless steel for general chemical applications and standard aqueous salt solutions.
- Duplex Stainless Steel: 2205 duplex stainless steel for environments with moderate chloride concentrations and higher yield strength demands.
- Super-Austenitic 904L: Sulfuric acid service at moderate concentration and temperature. Not suitable for hot, strong chloride media.
- Titanium TA2: Chloride brines and oxidizing acids. Not suitable for hydrochloric acid, fluorides or dry chlorine; use Hastelloy C-276 for those duties.
- Hastelloy C-276: Available for the drum, scroll and screen in ammonium chloride and mixed-halide service, with EN 10204 3.1 certificates for all wetted parts.
Running Stability
- Main Drive & Bearing Assembly: Cast main bearing housing supports drum rotational loads during continuous operation.
- Differential Drive Mechanism: Mechanical gear reduction system regulates relative drum and spiral speed under mechanical loads.
- Circulating Oil Lubrication: Integrated oil circulating system incorporates pressure regulation, inline oil filtration, and water-cooled heat exchangers.
- Bearing Temperature Control: Continuous oil delivery maintains thermal stability across main bearing journals during extended operating cycles.
Custom Options
- Explosion-Proof Electrical Hardware: Available with explosion-proof drive motors and junction boxes for classified hazardous areas.
- High-Viscosity Feed Modifications: Hydraulic differential drive option and adjusted feed paths allow processing of high-viscosity slurries.
- High-Temperature Design Adjustments: Thermal expansion clearance adjustments and seal selections allow high-temperature process stream handling.
- Custom Flange Connections: Feed, wash, and discharge connection flanges can be modified to match site-specific piping layouts.
Quality Control
CNC Machining: Primary rotating components, drum housings, and spiral assemblies are machined using CNC machine tools and machining centers.
Dynamic Balancing Verification: Rotating drums and pusher spiral assemblies undergo two-plane dynamic balancing per ISO 21940-11 (formerly ISO 1940-1), grade G2.5, with drum and scroll balanced separately.
Assembly Verification Testing: Completed centrifuges undergo mechanical dry-run testing, noise measurement, and vibration checks at the factory before shipment.
FAQ
1. When should I choose this model over a pusher or peeler centrifuge?
Choose it for continuous, high-volume processing of coarse crystals above 0.15 mm, especially with viscous or variable feeds. Choose a peeler centrifuge for fine crystals below 0.1 mm or frequent product changes.
2. What cake moisture can I expect?
Typical results are 2–4% for ammonium sulfate, 3–6% for sodium sulfate, and 3–8% for citric acid. Coarse crystals with a narrow size distribution typically reach the lower end of these ranges.
3. When do I need a hydraulic differential drive?
Choose it for viscous feeds above about 200 mPa·s or heavy, fluctuating solids loads. It maintains stable torque at low differential speeds.
4. How does differential speed affect moisture and throughput?
Reducing differential speed from 40 to 15 rpm typically lowers cake moisture by 1–3 percentage points but reduces capacity by 30–40%.
5. Which wetted material is suitable for ammonium chloride and sodium sulfate?
Ammonium chloride at 60°C or higher typically requires titanium TA2 or Hastelloy C-276. Sodium sulfate is generally suitable for SS316L.
6. How long do the screen, scroll, and bearings last?
Screens typically last 6–12 months in abrasive service and 18–24 months with salts. Carbide-hardfaced scrolls usually last 2–4 years. Bearings typically require replacement every 3–5 years, or 25,000–40,000 operating hours.
7. What do you need for sample testing and a quotation?
Please provide 20–50 kg of dry or wet solids, particle-size data (D10/D50/D90), solid density, feed-solids concentration, temperature, pH or chloride content, target capacity, and target moisture.
8. What is the lead time?
Stainless steel models typically ship within 90–120 days. Titanium and Hastelloy models usually take 120–150 days.
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