Scraper Bottom Discharge Centrifuge for Fertilizer Salt Crystal Dewatering

The Scraper Bottom Discharge Centrifuge is designed for the dewatering, washing, and automatic discharge of filterable fertilizer salt crystals after evaporation, cooling crystallization, or reaction crystallization.

Fertilizer salt slurry commonly contains crystals together with mother liquor, dissolved impurities, and residual process liquid. The centrifuge separates the mother liquor from the crystal cake, supports controlled cake washing when required, reduces retained liquid by high-speed spin drying, and automatically removes the dewatered crystals through the bottom discharge outlet.

It is suitable for fertilizer salt products that can form a stable and permeable filter cake, such as ammonium sulfate, potassium sulfate, potassium chloride, and other crystalline fertilizer salts subject to actual slurry behavior.

• Ammonium sulfate crystal dewatering
• Potassium sulfate crystal separation
• Potassium chloride crystal dewatering
• Crystalline fertilizer salt mother liquor removal
• Fertilizer salt cake washing before drying
• Evaporative crystallizer slurry dewatering
• Fertilizer salt recovery from recycle liquor
• High-solids fertilizer crystal slurry handling
• Crystal dewatering before drying, cooling, screening, or packaging
• Batch solid-liquid separation in fertilizer salt production lines

1. Fertilizer Salt Slurry Feeding

Crystallized fertilizer salt slurry enters the rotating basket through a controlled feed system.

2. Mother Liquor Filtration

Mother liquor passes through the filter medium and is collected through the filtrate outlet.

3. Crystal Retention

Fertilizer salt crystals remain inside the basket while the liquid phase is discharged.

4. Cake Formation

The retained crystals gradually form a stable filter cake on the inner basket surface.

5. Optional Cake Washing

Compatible wash liquid can be introduced to reduce residual mother liquor, soluble impurities, or process residues retained between crystals.

6. Spin Drying

The basket continues rotating at high speed to reduce free liquid retained in the fertilizer salt cake.

7. Automatic Scraping and Bottom Discharge

After the programmed cycle is completed, the scraper removes the dewatered crystal cake from the basket wall and discharges it automatically through the bottom outlet.

Automatic Cake Discharge

The scraper removes the dewatered fertilizer salt cake automatically, reducing manual unloading and supporting stable batch operation.

Reduced Dryer Load

Centrifugal filtration and spin drying reduce retained mother liquor before thermal drying, helping lower downstream drying demand.

Controlled Mother Liquor Recovery

Separated mother liquor can be returned to the crystallizer, evaporation section, recycle tank, or controlled purge stream according to the process design.

Optional Washing for Product Quality

A controlled wash step can reduce mother liquor residue and improve crystal cleanliness. The wash conditions should be selected carefully to avoid unnecessary fertilizer salt dissolution.

Suitable for High-Solids Crystal Slurry

The centrifuge is suitable for concentrated, filterable fertilizer salt slurry that forms a stable and removable cake inside the basket.

To recommend a suitable fertilizer salt dewatering solution, please provide:

• Fertilizer salt type
• Crystal size distribution
• Slurry solids concentration
• Mother liquor composition
• Feed temperature and viscosity
• Required production capacity
• Required batch capacity or cycle time
• Target cake moisture
• Cake washing requirement
• Mother liquor recycle or purge arrangement
• Corrosion condition
• Required material of construction
• Downstream dryer, cooler, screen, or packaging arrangement
• Explosion-proof requirement, if applicable

Is this centrifuge suitable for ammonium sulfate crystal dewatering?

Yes. It is suitable for ammonium sulfate slurry that forms a stable and filterable crystal cake. Final basket size, filter medium, washing sequence, and material selection should be confirmed from the actual slurry data.

Can the centrifuge be connected to a continuous crystallizer?

Yes. An agitated slurry buffer tank is normally installed between the crystallizer and centrifuge to match continuous crystal generation with automatic batch dewatering.

Can fertilizer salt crystals be washed inside the centrifuge?

Yes. An optional cake washing system can be configured. The wash liquid and wash volume should be selected carefully to reduce impurities while limiting product dissolution.

Where does the separated mother liquor go?

The filtrate can be recycled to the crystallizer or evaporation section, stored in a mother liquor tank, sent to a purge stream, or routed to further recovery or treatment.

Can the discharged salt go directly to a dryer?

Yes. The dewatered fertilizer salt cake can be transferred to a fluid-bed dryer, rotary dryer, cooler, screen, storage silo, or packaging line depending on the process layout.

Peony supports fertilizer producers, crystallization contractors, evaporation system suppliers, and industrial salt recovery projects with centrifuge selection, slurry handling design, filter media matching, mother liquor recycle arrangement, cake washing configuration, material selection, installation guidance, spare parts, commissioning, and after-sales service.

Send us your fertilizer salt type, slurry concentration, crystal size, mother liquor composition, required capacity, target moisture, and downstream process arrangement. Our engineering team will help evaluate a suitable Scraper Bottom Discharge Centrifuge solution.