Calcium carbonate (CaCO3) slurry is one of the harshest media in the paper industry — abrasive, quick to settle, and extremely demanding on pumps. A paper mill in Vietnam spent years struggling with screw pumps that broke down frequently, leaked through the seals, interrupted production, and contaminated the working area. After a thorough search and comparison, the mill turned to Bonve Pump for a reliable solution: a rotary lobe pump for calcium carbonate, built to handle the toughest transfer duties.
The Challenge: A Screw Pump That Could Not Keep Up
The application required continuous transfer of:
- Media: 20–30% calcium carbonate (CaCO3) slurry
- Temperature: 35°C
- Flow rate: 5 m³/h
- Pressure: 3 bar
The mill’s existing screw pumps suffered from:
- Frequent breakdowns, causing production downtime and delivery delays
- Mechanical seal leakage, contaminating the pump area and creating safety risks
- High maintenance costs and frequent replacement of wearing parts
- Unstable, pulsating output that affected process consistency
The Solution: Bonve Lobe Pump
After comparing different pump technologies, the mill selected two Bonve lobe pumps. Our lobe pumps are backed by 20 years of industry experience in paper mills, where we have provided complete transfer solutions for many paper production plants. This calcium carbonate transfer pump is engineered for abrasive, settling slurries.
Pump Technical datasheet
- Model: 65BV12-10
- Rotor type: Bi-lobe rotors
- Material: SS304
- Seal: Double mechanical seal
- Motor power: 4 kW
- Quantity: 2sets
Why Choose a Bonve Rotary Lobe Pump for Calcium Carbonate?
Compared with the previous screw pumps, the Bonve rotary lobe pump delivers clear advantages in reliability, sealing, and total cost of ownership:
Lobe Pump vs Screw Pump — Key Advantages
|
Comparison Item |
Screw Pump (previous) |
Bonve Lobe Pump |
|
Handling abrasive CaCO3 slurry |
Screw and stator wear rapidly; short service life |
Bi-lobe rotors handle particles gently with high wear resistance |
|
Seal reliability |
Frequent seal leakage; medium contamination of site |
Double mechanical seal, zero leakage, long seal life |
|
Failure rate |
High, with frequent unplanned downtime |
Low; continuous, stable operation |
|
Maintenance |
Complex; frequent replacement of stator and screw |
Simple structure, fewer wearing parts, easy maintenance |
|
Flow stability |
Pulsating flow, especially at low rates |
Smooth, gentle, low-shear transfer |
|
Self-priming / short dry run |
Sensitive; easily damaged |
Good self-priming; tolerant of brief dry run |
|
Total cost of ownership |
High (downtime + spare parts) |
Low (long service life, low maintenance) |
Results — Stable, Leak-Free Operation Since 2023
- Installed and commissioned in November 2023, started up smoothly
- Running stably and continuously ever since
- Zero failures to date
- The double mechanical seal remains in perfect condition with no leakage
- A cleaner, safer working environment around the pump area
- Significant reduction in maintenance cost and unplanned downtime
Conclusion
For a paper mill that could no longer tolerate frequent breakdowns, seal leakage, and production delays, switching from screw pumps to a Bonve rotary lobe pump turned out to be the right decision. With years of trouble-free, leak-free operation, the 65BV12-10 rotary lobe pump has proven to be a reliable calcium carbonate transfer pump and a cost-effective solution for the paper industry.
Looking for a dependable rotary lobe pump for calcium carbonate? Contact Bonve Pump today for a tailored transfer solution for your application.
Andre Chen
Sales Engineer
Mobile/WhatsApp/Wechat: +86 15888591452
Email: bvsales2@bonvepumps.com
