Scraper Bottom Discharge Centrifuge for Chlor-Alkali Salt Sludge Separation
Description
The Scraper Bottom Discharge Centrifuge is designed for the solid-liquid separation, washing, and dewatering of chlor-alkali salt sludge generated during brine purification.
In a typical chlor-alkali process, raw brine may contain calcium, magnesium, suspended solids, insoluble impurities, silica, iron compounds, and other contaminants. After chemical purification, calcium carbonate, magnesium hydroxide, and insoluble salt sludge are formed and must be removed before the brine enters the electrolysis process.
Compared with manual discharge centrifuges, the bottom scraper design reduces operator handling, improves batch consistency, and supports cleaner operation in chlor-alkali brine purification systems.
Typical Chlor-Alkali Salt Sludge Applications
- Primary brine purification sludge separation
- Calcium carbonate sludge dewatering
- Magnesium hydroxide sludge separation
- Chlor-alkali brine clarification residue treatment
- Salt sludge washing before disposal or reuse
- Sodium chloride brine recovery from purification sludge
- Caustic soda and soda ash precipitation sludge treatment
- Chlor-alkali wastewater salt recovery systems
- Membrane-cell chlor-alkali brine treatment units
- Salt lake brine purification and inorganic salt processing
Why Choose a Scraper Bottom Discharge Centrifuge for Chlor-Alkali Salt Sludge Separation?
Chlor-alkali brine purification sludge often presents several separation challenges:
- High chloride concentration and corrosion risk
- Fine calcium carbonate and magnesium hydroxide particles
- Variable solids concentration caused by brine quality fluctuation
- Need to recover sodium chloride brine from the sludge
- Requirement for cake washing to reduce residual salt and alkali
- High labor intensity with manual cake removal
- Need for enclosed and cleaner handling in brine treatment areas
- Requirement for stable, repeatable batch separation performance
The Scraper Bottom Discharge Centrifuge addresses these requirements through centrifugal filtration, optional cake washing, automatic scraper discharge, and PLC-controlled batch operation.
Chlor-Alkali Salt Sludge Separation Solution
Peony provides not only centrifuge equipment, but also complete solid-liquid separation support for chlor-alkali brine purification systems.
Process Evaluation
Our engineers evaluate:
Salt sludge composition
Calcium carbonate and magnesium hydroxide content
Sodium chloride concentration
Slurry solids content
Particle size distribution
Cake permeability and filtration behavior
Mother liquor properties
Target cake moisture content
Washing requirement
Brine recovery requirement
Production capacity and operating cycle
Equipment Selection
We help customers select:
Suitable basket diameter and batch capacity
Filter media and screen configuration
Cake washing system
Scraper design and discharge arrangement
Material of construction
PLC automation level
Filtrate collection and brine return system
Explosion-proof electrical configuration when required
How the Scraper Bottom Discharge Centrifuge Works in Chlor-Alkali Salt Sludge Separation
The chlor-alkali salt sludge slurry is fed into the rotating basket lined with filter media.
Under centrifugal force:
- The sodium chloride brine passes through the filter medium.
- Calcium carbonate, magnesium hydroxide, and insoluble sludge are retained inside the basket.
- A filter cake gradually forms on the inner surface of the basket.
- Optional wash liquid is sprayed onto the cake to reduce residual salt, alkali, or soluble impurities.
- High-speed rotation removes residual moisture from the cake.
- The scraper automatically removes the dewatered cake from the basket wall.
- The separated salt sludge is discharged through the bottom outlet.
The complete batch cycle is automatically controlled through PLC operation to ensure stable and repeatable separation performance.
Material Selection for Chlor-Alkali Brine Service
Chlor-alkali salt sludge normally contains chloride-rich brine, alkali, carbonate, and suspended solids. Material selection should be based on chloride concentration, operating temperature, pH, oxidizing conditions, and cleaning chemicals.
|
Wetted Part
|
Typical Material Options
|
| Basket and casing |
SS316L, Duplex 2205, Super Duplex 2507 |
| Filter support structure |
SS316L or Duplex Stainless Steel |
| Scraper assembly |
SS316L, Duplex Stainless Steel, or customized alloy |
| Brine contact piping |
SS316L, Duplex, PTFE-lined steel, or customized material |
| Seals and gaskets |
PTFE, EPDM, FKM, or chemical-resistant customized materials |
| High-corrosion applications |
Titanium or special alloy materials, if required |
For high-chloride and elevated-temperature conditions, Duplex or Super Duplex Stainless Steel may be more suitable than standard stainless steel.
Technical Parameter
|
Model
|
Diameter
|
Volume
|
Capacity
|
Speed
|
G-force
|
Power
|
Weight
|
Dimension
|
|
PPSBD-140
|
800 mm
|
100 L
|
140 kg
|
1500 rpm
|
1008
|
11 kW
|
3000 kg
|
1800 × 1200 × 1670 mm
|
|
PPSBD-200
|
1000 mm
|
150 L
|
200 kg
|
1200 rpm
|
806
|
15 kW
|
4000 kg
|
2050 × 1500 × 2000 mm
|
|
PPSBD-200
|
1000 mm
|
150 L
|
200 kg
|
1200 rpm
|
567
|
15 kW
|
4000 kg
|
2050 × 1500 × 2000 mm
|
|
PPSBD-400
|
1250 mm
|
280 L
|
400 kg
|
900 rpm
|
567
|
18.5 kW
|
5000 kg
|
2350 × 1650 × 2450 mm
|
|
PPSBD-540
|
1250 mm
|
400 L
|
540 kg
|
1000 rpm
|
700
|
22 kW
|
5000 kg
|
2350 × 1650 × 2920 mm
|
|
PPSBD-540
|
1250 mm
|
400 L
|
540 kg
|
1000 rpm
|
700
|
22 kW
|
5500 kg
|
2400 × 1700 × 2920 mm
|
|
PPSBD-1200
|
1600 mm
|
900 L
|
1200 kg
|
850 rpm
|
647
|
37 kW
|
8500 kg
|
3000 × 2200 × 3300 mm
|
Main Advantages in Chlor-Alkali Salt Sludge Separation
Efficient Brine Recovery
The centrifuge separates sodium chloride brine from the salt sludge and helps reduce brine loss during purification sludge treatment.
Automatic Cake Discharge
The scraper mechanism automatically removes the cake after dewatering, reducing manual cleaning and handling work.
Optional Cake Washing
A wash liquid system can be integrated to reduce residual sodium chloride brine, alkali, carbonate, or other soluble impurities in the cake.
Lower Cake Moisture
High-speed centrifugal dewatering helps reduce residual moisture before downstream handling, drying, disposal, or reuse.
Enclosed Batch Operation
The closed structure supports cleaner operation and reduces splashing in chlor-alkali brine purification areas.
Corrosion-Resistant Construction
Wetted parts can be customized in SS316L, Duplex Stainless Steel, Super Duplex Stainless Steel, titanium, or other special materials.
PLC-Controlled Operation
The complete operating sequence can be automatically controlled, including feeding, filtering, washing, spinning, scraping, discharge, and alarm protection.
What Data Is Needed for Selection?
To recommend a suitable centrifuge model, please provide:
- Salt sludge composition
- Sodium chloride concentration
- Calcium carbonate content
- Magnesium hydroxide content
- Solids concentration
- Particle size distribution
- Feed flow rate or batch volume
- Feed temperature
- Slurry pH
- Target cake moisture
- Washing requirement
- Filtrate clarity requirement
- Corrosion condition
- Required material of construction
- Installation area
- Power supply
- Explosion-proof requirement, if applicable
FAQ
Why is a scraper centrifuge suitable for sodium sulfate?
Sodium sulfate crystals are generally coarse and easy to filter. The scraper discharge system can efficiently remove large crystal cakes while reducing manual labor.
Can the centrifuge perform cake washing?
Yes. A washing system can be integrated to improve sodium sulfate purity.
What moisture content can be achieved?
Final moisture typically ranges from 2% to 8%, depending on crystal size and operating conditions.
Can it handle corrosive salt solutions?
Yes. SS316L, Duplex Stainless Steel, Titanium, and other corrosion-resistant materials are available.
Is explosion-proof design available?
Yes. ATEX-compliant and explosion-proof configurations can be provided when required.
Contact Peony for Partnership
Peony welcomes distributors, agents, EPC contractors, and industrial partners involved in inorganic salt production, sodium sulfate processing, crystallization systems, and solid-liquid separation projects.
We provide equipment selection support, process consultation, application engineering, spare parts supply, technical training, and after-sales service to help partners expand their local markets.
Send us your sodium sulfate crystal data, production capacity, moisture target, and process requirements. Our engineering team will recommend the most suitable centrifuge solution for your project.
