Decanter Centrifuge for Titanium Dioxide Slurry Washing and
Dewatering
Description
The Peony Decanter Centrifuge for Titanium Dioxide Slurry Washing
and Dewatering is designed for the continuous thickening,
washing-stage separation, and recovery of TiO₂ slurry from pigment
production, surface treatment, washing, and wastewater recovery
processes.
Titanium dioxide slurry often contains fine pigment particles,
residual acids, soluble salts, treatment chemicals, or wash liquor
carried over from upstream processing. The decanter centrifuge
separates the TiO₂ solids from the liquid phase continuously,
allowing the slurry to be thickened before further washing,
filtration, drying, coating, or milling.
This configuration is suitable for continuous production lines
where stable solids recovery, wash-liquid control, reduced slurry
volume, and process-water reuse are important.
Typical Applications
- Titanium dioxide pigment slurry thickening
- TiO₂ washing-stage separation
- Removal of residual soluble salts after washing
- Acidic TiO₂ slurry dewatering
- Chloride-process titanium dioxide slurry treatment
- Sulfate-process titanium dioxide slurry washing
- TiO₂ surface-treatment slurry concentration
- Pigment slurry recovery from process water
- Titanium dioxide wastewater solids recovery
- TiO₂ slurry preparation before filter pressing
- Titanium dioxide residue recovery before drying
- Process-water recycle in pigment production lines
Titanium Dioxide Slurry Washing and Dewatering Solution
Peony provides the continuous solid-liquid separation section for
titanium dioxide washing and thickening processes.
TiO₂ Slurry → Dilution Wash / Reslurry Tank → Decanter Centrifuge →
Wash Liquor Collection → Optional Second Washing Stage → Thickened
TiO₂ Slurry → Filter Press / Dryer / Surface Treatment / Milling
For applications requiring lower soluble-salt carryover, a
multi-stage washing arrangement can be used:
TiO₂ Slurry → Wash Tank → Decanter 1 → Reslurry Tank → Decanter 2 →
Final Thickened TiO₂ → Filter Press / Dryer
The separated liquid can be returned to an upstream washing stage,
sent to process-water treatment, or discharged through a controlled
wastewater circuit.
Peony can provide:
- Decanter centrifuge selection based on TiO₂ particle size and
slurry behavior
- Agitated washing and reslurry tanks
- Controlled feed pump and flow regulation
- Fresh-water or recycled wash-water dosing arrangement
- Multi-stage washing and thickening configuration
- Adjustable bowl speed, differential speed, and pond depth
- Corrosion-resistant wetted material configuration
- Wear protection for scroll and solids discharge areas
- Wash-liquor collection, recycle, or treatment connection
- PLC and VFD control system
- Connection to filter presses, dryers, surface-treatment systems, or
milling lines
How the Decanter Centrifuge Works1. TiO₂ Slurry Conditioning
Titanium dioxide slurry enters an agitated buffer tank or washing
tank before centrifugation.
Where washing is required, fresh water or recycled wash liquid is
added to dilute residual soluble salts, acids, or impurities
carried with the pigment slurry.
2. Controlled Slurry Feeding
The conditioned slurry enters the rotating bowl through a
controlled feed pipe.
Stable feed concentration is important because TiO₂ slurry can be
fine, dense, and sensitive to changes in viscosity or solids
content.
3. Centrifugal Sedimentation
Inside the high-speed rotating bowl, centrifugal force separates
titanium dioxide solids from the liquid phase.
TiO₂ particles settle against the bowl wall, while the wash liquor
or clarified liquid forms the inner layer.
4. Continuous Solids Conveying
The internal screw conveyor rotates at a controlled differential
speed relative to the bowl.
This transports the settled TiO₂ solids toward the conical end for
continuous discharge.
5. Wash Liquor Discharge
The separated liquid leaves through the liquid outlet.
It can be reused in an upstream washing stage, returned to a
process-water tank, sent to further washing, or routed to
wastewater treatment.
6. Thickened TiO₂ Solids Discharge
The concentrated titanium dioxide solids are discharged
continuously from the solids outlet.
The discharged solids can be sent to a second washing stage, filter
press, dryer, surface-treatment process, or pigment milling system.
Technical Parameter
| Model | Diameter (mm) | Length (mm) | Length-to-diameter rate | G force | Max solid discharge (m³/h) | Weight (kg) | Dimension (L*W*H) (mm) |
|---|
| PDC-10 | 250 | 1000 | 4 | 4080 | 0.4 | 1000 | 2410*800*1080 |
| PDC-12 | 4200 | 1350 | 4 | 3500 | 0.6 | 1200 | 2610*800*1080 |
| PDC-12 | 4200 | 1350 | 4.5 | 3180 | 1.2 | 1800 | 3495*840*1180 |
| PDC-18 | 4000 | 1600 | 4.5 | 3180 | 1.2 | 3200 | 3497*1020*1385 |
| PDC-18 | 450 | 2150 | 4 | 2500 | 2 | 3800 | 4447*1080*1385 |
| PDC-20 | 400 | 2250 | 4.5 | 2500 | 3.5 | 4000 | 4580*1140*1470 |
| PDC-21 | 530 | 2280 | 4.3 | 2500 | 5 | 5000 | 4924*1170*1540 |
| PDC-26 | 655 | 2800 | 4.3 | 2270 | 8 | 7000 | 4300*1900*1350 |
Key Selection Considerations
TiO₂ Particle Size and Settling Behavior
Titanium dioxide particles are fine and dense. Particle-size
distribution, agglomeration condition, and slurry dispersion
behavior directly affect separation performance.
Residual Salt and Acid Removal Requirement
The required washing stages depend on the amount of residual
chloride, sulfate, acid, alkali, or soluble impurities remaining in
the TiO₂ slurry.
Slurry Chemistry
Material selection should consider pH, chloride concentration,
sulfuric acid residue, temperature, oxidizing conditions, and
cleaning chemicals.
Feed Solids Concentration
A stable solids concentration improves separation consistency. Very
dilute slurry may require more wash stages, higher hydraulic
capacity, or feed conditioning.
Final Moisture Requirement
A decanter centrifuge is generally used for thickening and primary
dewatering. For lower final moisture, TiO₂ slurry is commonly sent
to a filter press, vacuum filter, spray dryer, flash dryer, or
other drying equipment.
Product Purity Requirement
For high-grade pigment applications, the washing system should be
designed around the required impurity limit rather than centrifuge
capacity alone. A staged reslurry and separation arrangement may be
necessary.
Main Advantages
Continuous TiO₂ Slurry Thickening
The centrifuge continuously reduces slurry volume and concentrates
titanium dioxide solids before final filtration or drying.
Supports Multi-Stage Washing
When combined with reslurry tanks, the decanter can support
one-stage or multi-stage washing to reduce soluble salt, acid, or
wash-liquor carryover.
Improved Solids Recovery
The decanter helps recover fine TiO₂ particles from dilute wash
streams or process water, reducing pigment loss.
Adjustable Separation Control
Bowl speed, differential speed, pond depth, and feed rate can be
adjusted to balance solids recovery, liquid clarity, handling
capacity, and discharged solids concentration.
Corrosion-Resistant Configuration Available
Wetted parts can be selected according to slurry chemistry, acid
content, chloride concentration, sulfate content, operating
temperature, and cleaning requirement.
Wear Protection for Dense Pigment Slurry
Wear-resistant protection can be applied to the feed zone, scroll
flights, bowl cone, and solids discharge section when required.
What Data Is Needed for Selection?
To recommend a suitable Titanium Dioxide Slurry Washing and
Dewatering solution, please provide:
- Titanium dioxide process route: sulfate process or chloride process
- TiO₂ grade and final application
- Particle-size distribution
- Slurry solids concentration
- Slurry density and viscosity
- pH and operating temperature
- Chloride, sulfate, acid, or alkali concentration
- Required wash stage quantity
- Required impurity-removal target
- Required processing capacity
- Required solids recovery rate
- Target solids concentration after centrifugation
- Wash-water source and available flow rate
- Process-water recycle requirement
- Downstream filter press, dryer, surface-treatment, or milling
arrangement
- Required material of construction
- Electrical and control standard
- Explosion-proof requirement, if applicable
FAQ
Can a decanter centrifuge wash titanium dioxide slurry directly?
A decanter centrifuge mainly performs continuous sedimentation and
dewatering. For washing, TiO₂ slurry is normally mixed with wash
water in an upstream reslurry or dilution tank before entering the
centrifuge.
Can the system remove residual chloride or sulfate salts?
Yes. A washing and reslurry system can reduce soluble salt
carryover. The final result depends on wash-water ratio, number of
washing stages, mixing efficiency, and separation performance.
Is one washing stage enough for titanium dioxide slurry?
It depends on the required product purity and impurity level. For
lower residual salt or acid targets, a two-stage or multi-stage
washing arrangement may be required.
Can the separated liquid be recycled?
Yes. Depending on its chemistry, the separated wash liquor can be
reused in an upstream wash stage, returned to a process-water tank,
or sent to wastewater treatment.
Does titanium dioxide slurry require special material selection?
Often yes. The proper wetted material depends on pH, chloride or
sulfate concentration, temperature, acid content, oxidizing
conditions, and cleaning chemicals. SS316L, duplex stainless steel,
titanium, or customized alloys may be considered.
Contact Peony for Partnership
Peony welcomes distributor and agent cooperation with titanium
dioxide producers, pigment manufacturers, chemical process
contractors, mineral processing plants, wastewater treatment
companies, and industrial separation partners.
We support partners with TiO₂ slurry testing, decanter centrifuge
selection, washing-stage design, corrosion-resistant material
configuration, feed and recycle system integration, installation
guidance, commissioning support, spare parts, and after-sales
service.
Send us your TiO₂ process route, slurry composition, particle size,
solids concentration, wash requirement, impurity target, required
capacity, material requirement, and downstream handling
arrangement. Our engineering team will recommend a suitable
Decanter Centrifuge solution for titanium dioxide slurry washing
and dewatering.
