Scraper Bottom Discharge Centrifuge for Ammonium Sulfate Dewatering

Compared with manual discharge centrifuges, the scraper bottom discharge design reduces labor intensity, improves batch consistency, and supports cleaner handling of ammonium sulfate crystals before drying, screening, packaging, or storage.

Ammonium sulfate separation usually requires efficient mother liquor removal, controlled crystal washing, stable cake discharge, and low residual moisture before downstream drying.

Typical operating challenges include:

• Variable crystal size after evaporation and crystallization
• High crystal concentration in the feed slurry
• Residual mother liquor affecting product purity
• Requirement for lower moisture before drying or packaging
• Need to reduce ammonium sulfate loss in the liquid phase
• Crystal washing requirements for improved purity
• High labor demand with manual crystal removal
• Corrosion risks caused by sulfate-containing mother liquor
• Need for enclosed and cleaner production conditions
• Requirement for stable and repeatable batch operation

The Scraper Bottom Discharge Centrifuge addresses these requirements through centrifugal filtration, optional cake washing, high-speed spin drying, automatic scraper discharge, and PLC-controlled operation.

Peony provides centrifuge equipment and separation support for ammonium sulfate crystallization, fertilizer production, chemical by-product recovery, and inorganic salt processing projects.

Process Evaluation

Our engineers evaluate:

• Ammonium sulfate crystal characteristics
• Crystal size distribution
• Crystal shape and mechanical strength
• Slurry solids concentration
• Mother liquor composition
• Feed temperature
• Cake permeability
• Filtration behavior
• Target cake moisture
• Product purity requirement
• Cake washing requirement
• Production capacity
• Batch cycle time
• Downstream drying and packaging requirements

Equipment Selection

We help customers select:

• Suitable basket diameter and working volume
• Filter media and screen configuration
• Feed loading method
• Cake washing arrangement
• Spin drying speed and cycle time
• Scraper design and discharge arrangement
• Material of construction
• PLC automation level
• Filtrate collection system
• Mother liquor recovery arrangement
• Explosion-proof electrical configuration, when required

The ammonium sulfate crystal slurry enters the rotating basket lined with filter media.

Under centrifugal force:

1. Mother liquor passes through the filter medium and is collected through the filtrate outlet.
2. Ammonium sulfate crystals are retained inside the basket.
3. A crystal cake gradually forms on the inner surface of the basket.
4. Optional wash liquid is sprayed onto the cake to reduce residual mother liquor and improve crystal purity.
5. High-speed rotation removes residual moisture from the crystal cake.
6. The scraper automatically removes the dewatered cake from the basket wall.
7. The separated ammonium sulfate crystals are discharged through the bottom outlet for drying, screening, packaging, reuse, or further treatment.

The complete batch cycle is automatically controlled through PLC operation to ensure stable and repeatable separation performance.

Efficient Mother Liquor Removal

The centrifuge separates mother liquor from ammonium sulfate crystals effectively, reducing liquid carryover into downstream drying and packaging systems.

Automatic Crystal Discharge

The scraper mechanism automatically removes the crystal cake after dewatering, reducing manual cleaning and improving operating efficiency.

Optional Cake Washing

A washing system can be integrated to reduce residual mother liquor, soluble impurities, and unwanted salts retained in the crystal cake.

Lower Cake Moisture

High-speed centrifugal dewatering helps reduce residual moisture before drying, screening, packaging, or storage.

Suitable for Crystallized Salt Slurry

The centrifuge is suitable for ammonium sulfate crystal slurry with stable cake-forming and filtration behavior.

Cleaner Batch Operation

The enclosed structure helps reduce splashing, crystal loss, and operator exposure during separation and discharge.

PLC-Controlled Process

The complete operating sequence can be automatically controlled, including feeding, filtration, cake washing, spin drying, scraper discharge, and safety protection.

Flexible Material Configuration

Wetted parts can be customized according to mother liquor composition, operating temperature, corrosion conditions, and cleaning chemicals.