Crystal Dewatering and Automatic Batch Separation Scraper Bottom Discharge Centrifuge

The Scraper Bottom Discharge Centrifuge is designed for crystal dewatering, mother liquor removal, cake washing, and automatic batch separation of filterable chemical and inorganic salt slurries.

It is suitable for crystallized materials with moderate to high solids content that can form a stable filter cake inside the basket. Typical applications include chemical crystals, inorganic salts, chloride salts, sulfate salts, carbonate crystals, mineral salts, and crystallized salts discharged from evaporation or crystallization systems.

The centrifuge completes feeding, filtration, optional cake washing, high-speed spin drying, automatic scraping, and bottom discharge within one controlled batch cycle. It helps reduce residual mother liquor, improve crystal cleanliness, lower cake moisture, and reduce manual handling.

Peony provides more than a centrifuge. We support the complete separation section between crystallization and downstream drying, screening, packaging, recycle, or disposal.

A typical solution includes:

Crystallizer / Evaporator → Slurry Buffer Tank → Scraper Bottom Discharge Centrifuge → Mother Liquor Collection → Optional Cake Washing → Crystal Discharge → Dryer / Screen / Packaging

For mother liquor recycle systems, the separated filtrate can be returned to an evaporator, crystallizer, dissolution tank, or designated recycle section according to the process design.

Process Evaluation

Our engineers evaluate:

• Crystal type and chemical composition
• Crystal size and particle-size distribution
• Slurry solids concentration
• Mother liquor density and viscosity
• Cake-forming and filtration behavior
• Target cake moisture
• Crystal washing and purity requirement
• Required batch capacity and operating cycle
• Corrosion condition and material compatibility

Equipment Selection

We help customers determine:

• Basket diameter and working volume
• Filter medium and screen configuration
• Feed method and batch loading quantity
• Washing system and wash-liquid distribution
• Spin-drying speed and cycle time
• Scraper mechanism and bottom discharge arrangement
• Filtrate collection and mother liquor recycle connection
• Product-contact material and corrosion-resistant configuration
• PLC automation and safety interlock level

How the Scraper Bottom Discharge Centrifuge Works

The crystallized slurry enters the rotating basket lined with filter media.

Under centrifugal force:

1. Slurry Feeding
   The crystal slurry enters the basket through the feed system.
2. Mother Liquor Filtration
   Mother liquor passes through the filter medium and is collected through the filtrate outlet.
3. Crystal Retention
   Crystals are retained inside the basket and gradually form a filter cake on the basket wall.
4. Optional Cake Washing
   Wash liquid can be sprayed onto the cake to reduce residual mother liquor, soluble impurities, salts, or other contaminants.
5. Spin Drying
   The basket continues rotating at high speed to remove residual liquid from the cake.
6. Automatic Scraping
   After the programmed dewatering cycle, the scraper removes the crystal cake from the basket wall.
7. Bottom Discharge
   The dewatered crystals are discharged through the bottom outlet for drying, screening, packaging, recycle, or further treatment.

The complete separation cycle is controlled through PLC operation to maintain stable filtration, repeatable washing performance, and automatic product discharge.