Scraper Bottom Discharge Centrifuge for Sodium Bicarbonate Crystal Dewatering

The Scraper Bottom Discharge Centrifuge is designed for batch filtration, cake washing, dewatering, and automatic discharge of filterable sodium bicarbonate crystals.

It is suitable for sodium bicarbonate production, crystallization recovery, purification, and post-treatment duties where the slurry contains sodium bicarbonate crystals, mother liquor, fine particles, dissolved salts, and residual wash liquid. The separation stage must remove mother liquor efficiently, support controlled washing where required, reduce residual liquid before downstream drying, and discharge crystals with limited manual handling.

This centrifuge is suitable for automatic batch production lines where sodium bicarbonate crystals are filterable and can form a stable cake. Final configuration should be confirmed according to crystal size distribution, fines content, mother liquor composition, washing target, target cake moisture, and downstream drying conditions.

Peony provides the solid-liquid separation section between crystallization and downstream drying, screening, storage, or packaging.

Sodium Bicarbonate Crystallizer / Slurry Tank → Controlled Feed → Scraper Bottom Discharge Centrifuge → Mother Liquor Collection / Recycle → Optional Cake Washing → Spin Dewatering → Automatic Scraper Discharge → Dryer / Screen / Storage / Packaging

Peony can provide:

• Scraper bottom discharge centrifuge selected according to crystal condition and required capacity
• Filter cloth, wire mesh, or perforated basket selection based on crystal size and fines content
• Controlled slurry feeding arrangement for even cake formation
• Optional cake-washing system for mother liquor displacement
• Filtrate collection, recycle, recovery, or treatment connection
• Automatic scraper discharge and bottom product collection arrangement
• Bottom hopper, screw conveyor, belt conveyor, or dryer-feed connection
• Product-contact material selection according to process chemistry
• PLC-controlled batch operation with safety interlocks
• Installation guidance, commissioning support, spare parts, and technical service

1. Sodium Bicarbonate Slurry Feeding

Sodium bicarbonate crystal slurry enters the rotating basket through a controlled feed system. The feed rate is adjusted to support even cake buildup and prevent localized overloading.

2. Mother Liquor Filtration

Mother liquor passes through the filter medium and basket perforations before leaving through the filtrate outlet.

3. Crystal Retention

Sodium bicarbonate crystals remain inside the basket while the liquid phase is discharged.

4. Filter Cake Formation

As feeding continues, retained crystals gradually form a stable filter cake on the inner basket wall.

5. Optional Cake Washing

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

Wash-liquid volume, temperature, and washing sequence should be controlled according to the required purity target and acceptable product loss.

6. Final Spin Dewatering

The basket continues rotating to reduce free liquid retained in the sodium bicarbonate crystal cake.

7. Scraper Cake Removal

After the programmed dewatering cycle is complete, the scraper mechanism removes the dewatered cake from the basket wall.

8. Bottom Product Discharge

The dewatered sodium bicarbonate crystals are discharged through the bottom outlet and transferred to a dryer, screen, conveyor, storage hopper, or packaging system.

Automatic Crystal Cake Discharge

The scraper removes the dewatered sodium bicarbonate cake through the bottom outlet after each batch cycle, reducing manual unloading and supporting more consistent production.

Stable Filtration for Crystal Slurry

The basket filtration design retains filterable sodium bicarbonate crystals while allowing mother liquor to pass through, supporting stable cake formation and clearer filtrate.

Controlled Mother Liquor Displacement

Optional in-basket washing helps reduce residual mother liquor and soluble impurities retained between crystals before final dewatering.

Lower Moisture Before Drying

Final spin dewatering reduces free liquid in the sodium bicarbonate cake, helping reduce the moisture load entering the downstream dryer.

Suitable for Automatic Batch Crystallization Lines

The centrifuge can operate after a crystallizer or slurry tank and connect directly with a hopper, screw conveyor, dryer feed system, screen, or storage section.

Is a scraper bottom discharge centrifuge suitable for sodium bicarbonate crystal dewatering?

Yes, provided the sodium bicarbonate crystals are filterable and can form a stable cake in the basket. Final selection depends on crystal size, fines content, slurry concentration, mother liquor composition, and required capacity.

Can sodium bicarbonate crystals be washed inside the centrifuge?

Yes. An optional in-basket washing system can be configured to reduce residual mother liquor and soluble impurities before final spin dewatering.

Can the mother liquor be recycled?

Yes. The filtrate can be returned to the crystallization loop, routed to recovery, or sent for further treatment depending on the overall process design.

Is the discharge automatic?

Yes. The scraper removes the dewatered crystal cake and discharges it through the bottom outlet after the separation cycle.

Can the centrifuge connect directly to a dryer?

Yes. The bottom discharge can be connected to a screw conveyor, belt conveyor, hopper, dryer-feed system, screening equipment, storage bin, or packaging line.