Decanter Centrifuge for Silica Sand Washing Slurry Dewatering
Description
The Decanter Centrifuge for Silica Sand Washing Slurry Dewatering is designed for continuous solid-liquid separation, fine sand recovery, slurry thickening, and process-water clarification in silica sand washing and mineral processing lines.
It is suitable for silica sand washing plants, quartz sand processing, glass sand preparation, foundry sand washing, frac sand processing, and sand-washing wastewater treatment. The centrifuge separates fine silica particles, clay, silt, and suspended solids from wash water. Thickened solids can be sent to filter press, dryer, stockpile, or disposal. Clarified water can be returned to the washing circuit or further treatment system.
Typical Applications
- Silica sand washing slurry dewatering
- Quartz sand wash-water clarification
- Fine sand and silt recovery
- Clay and mud removal from sand washing water
- Glass sand processing wastewater treatment
- Foundry sand washing slurry thickening
- Frac sand process-water recycle
- Filter press feed thickening
- Mineral washing wastewater treatment
Why Use a Decanter Centrifuge for Silica Sand Washing Slurry?
| Process Requirement |
Decanter Centrifuge Solution |
| High wash-water volume |
Continuous automatic separation |
| Fine sand and silt recovery |
High centrifugal separation force |
| Abrasive silica particles |
Wear-resistant scroll and discharge protection |
| Variable slurry concentration |
Adjustable bowl speed and differential speed |
| Water recycle |
Clarified liquid for reuse or further treatment |
| Lower sludge volume |
Thickened solids before filter press or disposal |
| Cleaner operation |
Enclosed continuous separation system |
Silica Sand Washing Slurry Dewatering Solution
Peony provides continuous solid-liquid separation for silica sand washing, fine solids recovery, and process-water recycle.
Silica Sand Washing / Classification → Slurry Tank → Optional Flocculant Dosing → Decanter Centrifuge → Thickened Fine Sand / Silt → Filter Press / Dryer / Disposal
Clarified Liquid → Process Water Tank → Recycle to Washing, Classification, or Further Treatment
Peony can provide:
- Decanter centrifuge selected according to silica sand slurry condition
- Agitated slurry buffer tank for stable feeding
- Controlled feed pump and flow regulation system
- Optional flocculant dosing and mixing system
- Adjustable differential speed and pond depth control
- Wear-resistant scroll, feed zone, and solids-discharge configuration
- Clarified liquid collection and recycle connection
- PLC and VFD automatic control system
- Connection to filter press, dryer, storage, or wastewater treatment system
How the Decanter Centrifuge Works
1. Silica Sand Slurry Feeding
Silica sand washing slurry enters the rotating bowl through a controlled feed pipe.
An agitated slurry tank is normally recommended upstream to prevent settling and maintain stable feed concentration.
2. Centrifugal Sedimentation
Inside the high-speed rotating bowl, centrifugal force separates silica particles, silt, clay, and other solids from the liquid phase.
The heavier mineral particles settle against the bowl wall, while clarified liquid remains closer to the center.
3. Continuous Solids Conveying
The internal screw conveyor rotates at a controlled differential speed relative to the bowl.
This movement transports settled solids toward the conical end for continuous discharge.
4. Clarified Liquid Discharge
The separated liquid leaves through the liquid outlet.
It can be returned to the sand washing line, classification section, process-water tank, or further wastewater treatment.
5. Thickened Solids Discharge
The concentrated silica fines, silt, clay, and sludge are discharged continuously from the solids outlet.
Recovered solids can be sent to a filter press, dryer, storage area, disposal section, or further classification stage.
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
Particle Size and Fine Content
Fine silica particles, clay, and silt affect separation efficiency, solids recovery, and clarified-water quality.
Abrasion Level
Silica sand is abrasive. Wear protection should be selected according to sand hardness, particle size, solids concentration, and daily operation time.
Slurry Concentration
High solids concentration may reduce throughput and increase wear. Stable feeding helps maintain separation performance.
Flocculant Compatibility
For very fine clay or silt, flocculant dosing may improve liquid clarity and solids capture. Testing is recommended before final selection.
Water Recycle Requirement
If clarified water will be reused directly in sand washing, the required suspended-solids level should be confirmed.
Downstream Handling
The decanter can be used before a filter press, dryer, storage pond, settling tank, or wastewater treatment system.
Main Advantages
Continuous Fine Solids Recovery
The decanter continuously recovers fine silica particles, silt, and sludge from washing water without batch interruption.
Wear-Resistant Configuration
Silica sand is highly abrasive. Wear protection can be added to the scroll, feed zone, bowl cone, and solids discharge area to support longer service life.
Stable Water Clarification
The clarified liquid can be reused in washing, rinsing, or classification, helping reduce fresh-water consumption and wastewater discharge.
Lower Filter Press Load
By thickening slurry before filter pressing, the decanter can reduce liquid volume and improve downstream sludge handling efficiency.
Adaptable to Variable Feed
Bowl speed, differential speed, pond depth, and feed rate can be adjusted according to sand content, clay content, particle size, and required water clarity.
What Data Is Needed for Selection?
Please provide the following information for a suitable silica sand washing slurry dewatering solution:
- Silica sand type and process stage
- Particle-size distribution
- Percentage of fine sand, clay, and silt
- Slurry solids concentration
- Slurry density and viscosity
- Required processing capacity
- Required solids recovery rate
- Target solids concentration after centrifugation
- Clarified-water quality requirement
- Water recycle requirement
- Abrasive impurity content
- Flocculant or polymer currently used
- Downstream filter press, dryer, pond, or storage arrangement
- Required material of construction
- Electrical and control standard
FAQ
Can a decanter centrifuge handle silica sand washing wastewater?
Yes. It can continuously separate fine sand, silt, clay, and suspended solids from silica sand washing water.
Is wear protection necessary?
Yes, it is strongly recommended. Silica sand is abrasive, especially at high solids concentration.
Can clarified water be reused?
Yes. Clarified water can often be returned to sand washing, rinsing, or classification. Further treatment may be needed for stricter water quality.
Can the decanter replace a filter press?
The decanter is mainly used for continuous thickening and primary dewatering. A filter press may still be needed if lower final moisture is required.
Is flocculant dosing required?
Not always. It depends on fine clay content, particle size, slurry condition, and required clarified-water quality.
Contact Peony for Partnership
Peony welcomes distributor and agent cooperation with silica sand washing plants, quartz sand processors, glass sand producers, foundry sand suppliers, frac sand companies, mineral processing contractors, wastewater treatment companies, and industrial separation partners.
We support partners with slurry testing, decanter centrifuge selection, wear-resistant configuration, flocculant dosing design, water-recycle integration, installation guidance, commissioning support, spare parts, and after-sales service.
Send us your silica sand slurry information, including particle size, solids concentration, fine content, required capacity, clarified-water target, abrasion condition, and downstream handling arrangement. Our engineering team will recommend a suitable decanter centrifuge solution for your silica sand washing slurry dewatering process.
