Paper & Pulp

Pumping Solutions for Paper & Pulp Mills

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Pumping Solutions For Paper & pulp Industry

In paper and pulp processing, pumping is less about moving liquid and more about managing fluid complexities with precision. Thick fibrous slurries, abrasive solids, and high-viscosity mixtures demand pumps that can perform without disruption.

From the aggressive chemical recovery process to the precision required in kitchen coating, operational flow is often threatened by the clogging, accelerated wear, and unplanned downtime. Roto Pumps addresses these vulnerabilities through precision-engineered progressive cavity pump technology. Its low-shear operation and ability to handle varying consistencies make them a dependable choice across multiple stages of the paper and pulp industry.

We move beyond the "one-size-fits-all" approach, providing the technical resilience needed to transform high-maintenance bottlenecks into streamlined, predictable assets. In an era where every minute of uptime defines your competitive edge, we provide the quintessential engineering quint-essential for seamless, continuous manufacturing.

Best Installations

Exploration and Production of Oil

Pumping 12 to16% Consistency Paper Pulp

Feeding Latex, Starch & Clay Slurry at varying flow rates to the cooker.

Dosing Various Chemical

MC pulp

Applications

Pulp Making Process

Black Liquor
Green Liquor
Sodium Hydroxide
Sodium Sulphide
Sodium Carbonate
Decolouring Agent
High Density Pulp

Pulp Preparation Process

Sizing Chemicals
Rosin
Neutral Sizing
Calcium Carbonate
Alkyl Ketene Dimer (AKD)
Alkenyl Succinic Anhydride (ASA)
Mineral Filler
Talc
Kaolin
Carbon Dioxide

Low Density Pulp
Pigments
Colours
Optical Brightener
Defoaming Agents
Retaining Aids
Paper Softener
Fiber Disperser

Paper Making Process

Starch
Polyvinyl Alcohol
Wax
Latex

Paper Coating Process

Starch
China Clay
Resin
Latex
Chemicals
Colour
Coating Slurry

Major Application Processes

Phase 1: Pulping & Chemical Recovery (Black Liquor)

Process: Wood chips and straw are processed in a Digestor to separate lignin from cellulose. This produces Black Liquor, which is then sent through evaporators to recover chemicals as green and white liquor.
Challenge: Black liquor is highly viscous, corrosive, and contains dissolved organic solids that can easily crystallize or cause scaling in standard pumps.
Roto Pump Used: Progressive Cavity (PC) Pumps are used for dosing chemicals into the digestor and transferring the concentrated black liquor.
Benefits: Roto pumps handle high-viscosity and chemically aggressive fluids with steady, pulse-free flow, preventing turbulence that could interfere with the chemical recovery cycle.

Phase 2: Stock Preparation (Medium Consistency Paper Pulp)

Process: Pulp from the digestor or de-inking plant is refined and moved through bleaching and washing plants. This results in Medium Consistency Paper Pulp being fed into the machine chest.
Challenge: Medium consistency pulp (8%–15% solids) is thick and non-Newtonian; it does not flow like water and can easily "dampen" or clog systems.
Roto Pump Used: A High-Consistency Roto Pump (often with a wide-throat hopper) is used at the machine chest and refiner stages.
Benefits: The positive displacement action ensures the thick pulp is moved reliably without dewatering the fiber, maintaining a consistent supply to the paper machine.

Phase 3: Kitchen Coating & Starch Processing

Process: In the Coating Kitchen, ingredients like Starch, China Clay, and Latex are mixed in a Cooker and prepared for the paper coater.
Challenge: Starch processing requires handling shear-sensitive fluids. If the starch or coating mix is agitated too violently, its viscosity changes, leading to uneven application on the paper.
Roto Pump Used: Roto PC Pumps are used to transfer starch to the cooker and the final coating mix to the paper coater.
Benefits: The low-shear pumping action preserves the delicate chemical structure of the coating media, ensuring a smooth, high-quality finish on the Coated Paper.

Phase 4: Chemical Dosing & Additives

Process: Sizing chemicals, dyes, resins, and defoaming agents are injected into the pulp sizing and hold tanks to give the paper specific properties.
Challenge: These chemicals must be added in exact, minute quantities. Any fluctuation in flow leads to variations in paper color, strength, or water resistance.
Roto Pump Used: Roto Dosing Pumps.
Benefits: These pumps offer high metering accuracy, allowing for precise control of expensive additives and ensuring uniform paper quality across the entire production run.

Phase 5: Effluent Processing

Process: Waste liquids from the hold tanks and washing plants are collected for Effluent processing to meet environmental standards before discharge.
Challenge: Effluent often contains a mix of abrasive grit, discarded fibers, and chemical residues that are unpredictable and harsh on mechanical seals.
Roto Pump Used: Roto Effluent Treatment Pumps.
Benefits: The robust design handles varying solid sizes and abrasive particles effectively, ensuring the treatment plant operates continuously without frequent seal failures or clogging.

Customizing Solutions — Pumps For Paper & Pulp Industry

Progressive Cavity Pumps
Capacity - Up to 500 m³/hr Pressure - Up to 48 bar

Aggressive Chemical Dosing Pumps
Capacity - Up to 500 LPH Pressure - Up to 24 bar

Twin Screw Pump
Capacity - Up to 940 m³/hr (4100 GPM) Pressure - Up to 30 bar (435 PSI)

Related Products

Progressive Cavity Pump

Performance Summary

Capacity - Up to 500 m³/hr
Pressure - Up to 48 bar

Advantages

Long-life elastomeric stators with minimal wear, designed to reliably handle viscous, abrasive, and solids-laden pigments including kaolin clay, calcium carbonate, and TiO₂.
Smooth, non-pulsating feed to starch cookers, ensuring consistent temperature control and uniform gelatinization while eliminating damaging pressure spikes.
Pulsation-free delivery of coating colours to application heads, guaranteeing uniform paper coverage and eliminating defects caused by pressure fluctuations.
High-precision dosing of high-value additives such as optical brighteners, dyes, biocides, and defoamers, with +/- 1% dosing accuracy at ultra-low flow rates down to 0.68 LPH.
Gentle, low-shear pumping of synthetic latex and starch solutions, preventing coagulation and destabilization that lead to costly filter clogging and process upsets.

Aggressive Chemical Dosing Pump

Performance Summary

Capacity - Up to 500 LPH
Pressure - Up to 24 bar

Advantages

Smooth, Laminar & Non-Pulsating Flow.
High dosing accuracy of +/-1%.
Low NPSH required & Inherently Self-Priming.
No need to use Pulsation Dampeners or additional valves.
No vapour lock & non-clogging.

Twin Screw Pump

Aggressive Chemical Dosing Pump

Performance Summary

Capacity - Up to 940 m³/hr (4100 GPM)
Pressure - Up to 30 bar (435 PSI)

Advantages

Robust, non-contacting screw design ensures there is no metal-to-metal contact, significantly minimizing wear even when handling abrasive particles, ash, and lignin found in concentrated black liquor.
Exceptional high-temperature and high-viscosity handling capability, ensuring reliable transfer of heavy black liquor to recovery boilers without performance degradation.
Low NPSHr and excellent suction lift effectively manages entrained gases and foaming liquor, eliminating the risk of cavitation and ensuring continuous, stable operation.
Smooth, pulsation-free delivery protects critical downstream equipment like heat exchangers, evaporators, and spray nozzles from damaging vibrations and pressure spikes.
High volumetric efficiency with reversible operation capabilities, making it ideal for efficient line stripping, clearing pipe blockages, and reducing maintenance downtime in complex mill networks.

China Petroleum Engineering & Construction Corporation (CPECC)

Rotopumps demonstrated exceptional cooperation during commissioning and troubleshooting. Their professionalism and commitment were appreciated by all stakeholders. We look forward to continuing this strong, win-win partnership.

India Petroleum Engineering & Construction Corporation (CPECC)

Rotopumps demonstrated exceptional cooperation during commissioning and troubleshooting. Their professionalism and commitment were appreciated by all stakeholders. We look forward to continuing this strong, win-win partnership.