Scraper Bottom Discharge Centrifuge for Mother Liquor Recycle Crystallization Loop

The Scraper Bottom Discharge Centrifuge is designed for crystal separation in mother liquor recycle crystallization loops. It separates crystallized solids from the circulating mother liquor, removes residual liquid from the crystal cake, and discharges the solids automatically through the bottom outlet.

In evaporation and crystallization systems, the mother liquor usually contains dissolved salts, impurities, fine crystals, and process components that still have recovery value. After crystal separation, the filtrate can be returned to the crystallizer, evaporator, dissolution tank, or upstream concentration section according to the process design.

Compared with manual discharge centrifuges, the automatic scraper system reduces operator handling, improves batch consistency, and supports cleaner crystal recovery in recycle crystallization systems.

• Mother liquor recycle crystallization loops
• Evaporation crystallization systems
• MVR crystallization projects
• Multiple-effect evaporation salt recovery
• Sodium chloride crystallization
• Sodium sulfate crystallization
• Potassium salt recovery
• Ammonium salt crystallization
• Inorganic salt production lines
• Petrochemical by-product salt recovery
• High-TDS wastewater salt recovery
• Zero liquid discharge crystallization systems
• Chemical intermediate crystal separation
• Fine chemical product purification

Process Evaluation

Our engineers evaluate:

• Crystal type and composition
• Crystal size distribution
• Crystal shape and mechanical strength
• Slurry solids concentration
• Mother liquor density and viscosity
• Dissolved salt concentration
• Impurity concentration
• Cake permeability
• Filtration rate
• Target product moisture
• Product purity requirement
• Cake washing requirement
• Mother liquor recycle route
• Evaporation and crystallization capacity
• Required batch cycle time

Equipment Selection

We help customers select:

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

The crystallized 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. Crystals are retained inside the basket and gradually form a filter cake.
3. The recovered mother liquor is returned to the crystallization loop, evaporation section, or other designated process stage.
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 crystals are discharged through the bottom outlet for drying, screening, packaging, reuse, or further treatment.

The complete cycle is controlled through PLC operation to maintain stable separation performance and repeatable mother liquor recovery.

What is the role of the centrifuge in a mother liquor recycle crystallization loop?

The centrifuge separates crystals from mother liquor after crystallization. The recovered mother liquor can then be returned to the evaporator, crystallizer, recycle tank, or another designated process section.

Can the centrifuge improve mother liquor recovery?

Yes. By separating liquid from the crystal cake efficiently, the centrifuge helps reduce mother liquor loss and supports recycle operation.

Can the centrifuge wash the crystal cake?

Yes. An optional wash system can spray water, condensate, brine, or another compatible wash medium onto the cake before final spin drying.

What moisture content can be achieved?

Final cake moisture depends on crystal size, cake permeability, slurry solids concentration, mother liquor viscosity, basket speed, and cycle time. A sample test is recommended before confirming a moisture target.

Can the centrifuge handle mixed salts?

It can be suitable when the salt slurry is crystalline, filterable, and able to form a stable cake. For mixed salts with high fines, high organic content, or poor filtration behavior, testing is recommended.