Top Discharge Centrifuge for Batch Filter Cake Washing

The Top Discharge Centrifuge is designed for batch filtration, in-basket cake washing, and final dewatering of filterable crystalline or particulate solids.

It is suitable for processes where the main separation target is not only to remove mother liquor, but also to wash the retained filter cake with a controlled liquid sequence before downstream drying, screening, reuse, or packaging.

This configuration is particularly suitable for batch processes that require controlled washing efficiency, flexible wash-liquid selection, and visual inspection of the cake before discharge.

• Batch filter cake washing after solid-liquid separation
• Mother liquor displacement before final drying
• Removal of residual soluble impurities from filter cakes
• Controlled washing of retained solids before product collection
• Single-stage or multi-stage cake washing processes
• Batch purification where wash sequence and wash volume require control
• Solid recovery processes requiring filtration, washing, and spin drying in one unit
• Small- to medium-batch production with flexible wash-liquid selection
• Product campaigns requiring visual cake inspection before discharge
• Batch processes requiring manual top discharge after washing
• Separation duties where reduced liquid carryover is needed before downstream drying
• Multi-product production requiring filter media replacement and cleaning between batches

Peony provides the batch filtration and cake washing section between upstream crystallization, reaction, slurry preparation, or washing systems and downstream drying, screening, storage, recovery, or packaging equipment.

Crystallizer / Reactor / Slurry Tank → Controlled Feed → Top Discharge Centrifuge → Filtrate Collection → Filter Cake Formation → In-Basket Washing → Spin Drying → Top Opening → Manual Cake Discharge → Dryer / Screen / Storage

Peony can provide:

• Top discharge centrifuge selected according to batch size and cake properties
• Filter cloth, screen, or perforated basket selection according to particle size
• Controlled feeding system for even cake formation
• Single-stage or multi-stage cake washing system
• Wash-liquid spray distribution arrangement
• Filtrate collection, recovery, recycle, or treatment connection
• Adjustable washing sequence through PLC control
• Corrosion-compatible product-contact material selection
• Standard or explosion-proof electrical configuration, as required
• Product collection bin, trolley, hopper, or dryer feed connection
• Installation guidance, commissioning support, spare parts, and technical service

1. Slurry Feeding

The feed slurry enters the rotating basket through a controlled inlet system. The feed rate is adjusted to support even cake buildup and avoid localized overload.

2. Initial Filtration

Mother liquor, solvent, wash water, or process liquid passes through the filter medium and basket perforations before leaving through the filtrate outlet.

3. Solid Retention

Crystals, granules, catalyst particles, or other filterable solids remain inside the basket while the liquid phase is discharged.

4. Filter Cake Formation

As feeding continues, the retained solids form a stable cake layer on the inner basket wall.

5. In-Basket Cake Washing

Wash liquid is introduced through a spray or distribution arrangement. The liquid passes through the cake to displace residual mother liquor, soluble impurities, salts, solvent, or unwanted reaction residues.

6. Optional Multi-Stage Washing

Where higher purity is required, more than one wash step can be applied using different wash liquids or controlled wash volumes.

7. Spin Drying

After washing is complete, the basket continues rotating to reduce free liquid retained in the filter cake.

8. Machine Stop and Top Opening

When the programmed cycle is complete, the centrifuge stops and the top cover opens.

9. Top Cake Discharge

The washed and dewatered cake is removed manually through the top opening and transferred to a dryer, screen, collection bin, hopper, storage system, or packaging process.

Please provide:

• Product name
• Particle or crystal size range
• Fines content
• Batch volume or required production capacity
• Slurry solids concentration
• Mother liquor composition
• Wash-liquid type and compatibility
• Required washing stages
• Required purity improvement target
• Acceptable product loss during washing
• Product solubility in wash liquid
• Feed temperature and slurry viscosity
• Required filtrate clarity
• Target cake moisture
• Corrosion condition
• Product-contact material requirement
• Explosion-proof or inerting requirement, if applicable
• Downstream drying, screening, storage, or packaging arrangement

Can the cake be washed inside the centrifuge?

Yes. The centrifuge can be configured with an in-basket washing system that introduces wash liquid after cake formation and before final spin drying.

What is the difference between cake washing and normal dewatering?

Normal dewatering mainly removes free liquid. Cake washing adds a controlled liquid step to displace mother liquor, dissolved impurities, solvent, salts, or reaction residue retained inside the cake.

Can more than one wash stage be used?

Yes. Single-stage or multi-stage washing can be configured according to the required product purity and allowable product loss.

Can the wash liquid be recovered?

Yes. Wash filtrate can be collected for recycle, solvent recovery, further processing, or wastewater treatment according to the process design.

Can the washing sequence be controlled automatically?

Yes. PLC control can be used to manage feed time, wash-liquid addition, wash duration, spin-drying time, and discharge sequence.

Peony welcomes distributor and agent cooperation with crystallization system suppliers, fine chemical companies, salt processing projects, chemical equipment integrators, solvent recovery contractors, and industrial filtration solution providers.

We support centrifuge selection, filter media matching, wash-liquid distribution design, product-contact material configuration, filtrate recovery connection, installation guidance, commissioning support, spare parts, and after-sales service.

Send us your product name, particle size, slurry solids concentration, mother liquor composition, wash-liquid information, required washing stages, purity target, target cake moisture, corrosion condition, and downstream handling arrangement.