Decanter Centrifuge
Filtration Equipment
1. Product Overview
The decanter centrifuge is a horizontal sedimentation centrifuge with helical discharge, built for continuous separation of suspensions by exploiting the solid-liquid density difference under centrifugal force. The machine consists of a rotating bowl, screw conveyor, differential gearbox, base frame and drive system. Typical duties include solid-liquid separation of industrial wastewater, chemical slurries, food juices and mine tailings. Key characteristics: continuous operation, high throughput, excellent separation performance, wide adaptability to different feeds and fully enclosed operation.
2. Working Principle
The suspension enters the bowl through the central feed pipe. In the centrifugal field generated at high rotational speed, the denser solid particles settle against the bowl wall and are conveyed by the screw toward the conical end for discharge, while the lighter clarified liquid overflows through ports at the large end of the bowl, making the separation fully continuous.
3. Classification
by Separation Process:
Dewatering decanter: short bowl with a low L/D ratio, for easily separated feeds with coarse particles — municipal sludge, mine tailings
Clarifying decanter: long bowl with a high L/D ratio and high separation factor, for fine, hard-to-separate feeds — chemical wastewater, juice clarification
3-phase decanter: separates the light phase (oil), the solids and the liquid phase (water) in a single pass — oily sludge, vegetable oil extraction
4. Detailed Technical Parameters
4.1 Standard Materials
| Material | Typical Components/Media | Remarks |
|---|---|---|
| 304 Stainless Steel | Bowl, screw | General purpose, moderate corrosion resistance |
| 316L Stainless Steel | Highly corrosive media | Preferred for chemical and marine applications |
| Duplex Stainless Steel 2205 | High wear and high corrosion combined | Excellent erosion-corrosion resistance |
4.2 Typical Specifications
| Bowl Diameter | L/D Ratio | Max Speed | Capacity (m³/h) | Main Motor Power |
|---|---|---|---|---|
| 250～350 | 3～4 | 4000～5000 | 1～5 | 5.5～15 |
| 350～500 | 3～4 | 3000～4000 | 5～20 | 15～45 |
| 500～900 | 3～4 | 1500～3000 | 20～100 | 45～200 |
4.3 Design Conditions & Performance
| Parameter | Specification |
|---|---|
| Separation Factor | 1000～5000 (model dependent) |
| Differential Type | Planetary gear / hydraulic differential |
| Screw Wear Protection | Replaceable tungsten carbide or ceramic wear tiles |
| Discharge Cake Moisture | 40%～80% (depending on feed properties) |
5. Electrical Parameters
| Region | Voltage | Frequency |
|---|---|---|
| China/Russia/Central Asia | 380V | 50Hz |
| Middle East/Southeast Asia/Africa | 400V / 415V | 50Hz |
| South Korea | 380V | 60Hz |
| Americas (if required) | 440V / 480V | 60Hz |
| Note: the voltage and frequency of the main motor and the auxiliary motor (or the hydraulic power unit of the differential) must be specified. |
6. Key Component Selection
| Component | Brand/Material | Features & Applications |
|---|---|---|
| Bowl & Screw | Custom-built | Centrifugal casting/forging, precision dynamic balancing |
| Differential | Domestic or imported | Planetary gear/cycloidal pinwheel, high torque, long service life |
| Main Bearings | SKF/FAG/NSK | Rated for high speed and heavy loads, with good vibration damping |
| Screw Wear Layer | Custom-matched | Tungsten carbide hardfacing/replaceable wear tiles |
7. Typical Applications
Environmental protection: dewatering of municipal sewage sludge and textile dyeing sludge
Chemical industry: separation of PVC, calcium carbonate and titanium dioxide
Food industry: palm oil, fruit juice and brewer's yeast separation
Mining & metallurgy: tailings dry stacking and coal slurry separation
8. Design Standards & Certifications
| Standard | Description |
|---|---|
| JB/T 502-2004 | Spiral discharge sedimentation centrifuges |
| ISO 9001:2015 | Quality management system |
| CE / EAC / GOST-R | Available on request for international orders |
9. Optional Custom Configurations
| Option | Details |
|---|---|
| Separation type | Dewatering / clarifying / 3-phase separation |
| Drive system | Dual motors with dual VFD / fluid coupling / hydraulic drive |
| Wear protection | Tungsten carbide hardfacing / ceramic tiles / replaceable wear plates |
| Special design | Explosion-proof / temperature-controlled jacket / sealed design |
10. Warranty Terms
| Equipment Status | Warranty Period | Warranty Scope |
|---|---|---|
| Brand new | 12 months | Bowl and screw assembly, differential, main bearings |
| Refurbished | 6 months | Bowl and screw assembly, differential, main bearings |
| Idle surplus | 3 months | Main functional components |
11. Packaging & Delivery
| Item | Packaging Method |
|---|---|
| Main body | Tarpaulin-wrapped, on a wooden skid or shipped nude |
| Motors / differential | Fully enclosed wooden cases |
| Electrical / instruments | Waterproof-sealed packaging inside wooden cases |
| Container capacity estimate (for reference only, subject to actual configuration): | |
| Small models (≤350 mm bowl): approx. 1 x 20'GP | |
| Medium and large models (≥450 mm bowl): approx. 1 x 40'OT or breakbulk shipment | |
| On-site installation and commissioning guidance available. |
12. Information Required for Inquiry
12. Information Required for Quotation: material name, solid particle size and density, liquid viscosity; capacity (m³/h); solids content; separation requirements (clarity/dewatering rate); preferred equipment condition (new/refurbished/idle); delivery terms (FOB/CIF/DDP); destination port.