In GME’s ULAB recycling process, the quality of the lead fractions obtained is determined before the melting stage. After the hammer mill crushes the spent lead-acid batteries, the crushed material is still a complex mixture of metallic lead, very fine lead paste, electrolyte, polypropylene, and other plastic materials such as separators and AGMs. The lead paste fraction must be immediately separated by washing to allow the other fractions to be separated with maximum efficiency.
This is the specific function of the GME Vibrating Screen with PowerWash system.
The equipment combines controlled vibration of multiple screen decks with a high-pressure washing system that separates the lead paste from the crushed mix and also thoroughly cleans the surfaces of other components of the crushed mix, such as metal and plastic elements. During the process, the fine lead paste separates and passes under the screen decks along with the water and electrolyte, leaving the larger solid fractions, which remain above the screen, completely clean. This separation of the lead paste and washing of the remaining fractions is the key to achieving clean downstream flows and a reliable separation process
Why the PowerWash Stage Matters in ULAB Recycling
A spent lead-acid battery is not a monolithic recyclable material; once crushed by the hammer mill, it becomes a mixed flow whose components have different sizes, densities, and surface characteristics. Lead paste can adhere to the surfaces of the metallic lead, polypropylene pieces, and separator pieces. If not effectively removed, these remain contaminated with lead paste, which reduces their purity and also reduces the separation efficiency of the polypropylene in the dedicated tank and in the downstream hydrodynamic separator.
The primary purpose of the PowerWash phase is therefore twofold: first, to separate the fine lead paste and electrolyte from the larger solids; second, to wash the retained metallic and plastic fractions so that they are of maximum purity and can be separated from each other under controlled conditions. The purity of the metallic products directly affects their ability to be melted in the furnace, which saves significant time, energy, and product loss in the resulting slag.
Application and Process
The GME Vibrating Screen with PowerWash system is installed downstream of the hammer mill in a ULAB battery recycling line. It receives the complete crushed stream and uses particle size, vibration and high-pressure water action to divide the fine and liquid components from the coarser solids.
GME Vibrating Screen with PowerWash System
Composition of the Material Discharged by the Hammer Mill
The material entering the vibrating screen can be divided into five main fractions:
- Lead metal. This fraction includes fine metal grid fragments, approximately 1 mm thick, made of lead-calcium or lead-antimony alloys, along with coarser cylindrical pieces such as battery terminals or poles, generally made of lead-antimony alloy.
- Lead paste. A very fine fraction with a particle size of less than 0.6 mm, composed primarily of lead oxide (PbO), lead dioxide (PbO2), and lead sulfate (PbSO4), with possible traces of metallic lead from grid fragments.
- Electrolyte. The liquid fraction, composed of approximately 15% sulfuric acid (H2SO4) and 85% water (H2O).
- Lightweight plastic. Primarily polypropylene (PP), primarily from battery casings and lids.
- Heavy plastics and separation materials. Polyethylene (PE), electrolyte-soaked glass fiber filaments (AGM), ABS, and other dense polymeric materials or separators present within the battery.
All fractions reach the vibrating screen simultaneously. The PowerWash stage is specifically designed to separate fractions 2 and 3 from fractions 1, 4, and 5, while also cleaning retained solids before final separation.
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Feeding and Distribution from the Hammer Mill
The process begins when the hammer mill frees the internal components of the battery and discharges the mixed material onto the first section of the vibrating screen. Vibration promotes distribution across the screening deck. The vibrating motion distributes the crushed material across the entire width of the vibrating screen, eliminating any buildup and allowing the washing jets to contact every surface of the material in transit. Uniform distribution is essential because each retained element must be subjected to adequate mechanical and hydraulic cleaning.
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Vibrating Perforated Screening Decks
The material advances on perforated screening decks, set at a slight angle to form a step between each deck, which facilitates the tipping of the material in transit.
These decks have 0.6 mm wide slotted openings. This size creates a controlled separation threshold between the very fine lead paste and the larger metal and plastic components.
The tipping of the material in transit between each deck also allows the surfaces hidden by the previous deck to be washed, redistributing retained fragments, and facilitating the passage of fine particles through the slots. It also helps break up local accumulations that could otherwise reduce the screening surface or create an irregular flow.
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PowerWash High-Pressure Cleaning
Above the screening decks, a series of stainless-steel spray nozzles delivers water at high pressure. The jets do more than rinse the material: they physically detach the fine lead paste from the surfaces of Pb Metallics, polypropylene and the heavier plastic or separator fraction.
The operating principle is comparable to an automatic car-wash tunnel, where an effective cleaning action is achieved with a relatively low volume of water delivered at high pressure. In the PowerWash system, this concentrated hydraulic action reaches the irregular surfaces of crushed battery components and removes the paste that vibration alone would not completely release.
Because the nozzles are arranged across the working area, the material is repeatedly washed while it travels along the vibrating decks. The combination of vibration and high-pressure spraying increases cleaning efficiency without relying on excessive water consumption.
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Separation of Pb Paste and Electrolyte through the 0.6 mm Slots
Once separated, the fine lead paste passes through the 0.6 mm slots along with the electrolyte and process water. The discharge below the screen is then a liquid-solid suspension containing the lead paste fraction, the residual electrolyte, and the wash water, creating a cloudy liquid that is sent to the filter press to recover the lead paste in the form of pressed cakes. The liquid phase is recycled to the nozzles on the screen for a subsequent washing step.
The larger components cannot pass through the slots and remain above the screen decks. These retained solids are Fraction 1, lead metals; Fraction 4, lightweight polypropylene; and Fraction 5, heavy plastics and separation materials. At the end of the vibrating screen, they have been substantially freed from the adhering lead paste and are ready for the subsequent separation steps.
- Downstream Separation of the Cleaned Solid Fractions
The PowerWash system does not complete the separation among Fractions 1, 4 and 5. Its role is to prepare these materials by removing the fine paste and liquid contamination that would interfere with the downstream equipment.
After leaving the vibrating screen, the cleaned solids enter the dedicated separation tank, where the light polypropylene fraction, Fraction 4, is separated from the other materials. The remaining stream is then processed by the hydrodynamic separator, which separates Pb Metallics, Fraction 1, from the heavier plastic and separator materials, Fraction 5.
This sequence creates a controlled process flow: Pb Paste and the liquid phase pass below the screen, while clean Pb Metallics, polypropylene and heavy plastic or separator materials continue toward their dedicated recovery sections.
Materials Processed by the GME PowerWash System
- Pb Metallics. The metallic lead fraction includes both thin grid fragments and coarse posts or terminals. These pieces must be cleaned carefully because residual paste on their surfaces would contaminate the metallic stream and reduce the quality of the subsequent hydrodynamic separation.
- Pb Paste. The paste is the finest solid fraction, with a particle size below 0.6 mm. Its principal compounds are PbO, PbO2 and PbSO4. High-pressure washing detaches it from the larger elements and directs it through the screen openings into the under-screen slurry.
- Electrolyte. The residual sulfuric-acid and water solution is already present in the hammer-mill discharge. It follows the liquid path through the screening decks together with the PowerWash water and the suspended lead paste.
- Polypropylene. PP is the light plastic fraction, typically originating from battery cases and covers. Once the adhering paste has been removed, it can be separated efficiently in the dedicated downstream tank.
- PE, AGM, ABS and Other Heavy Fractions. These materials can retain paste and, particularly in the case of fibrous separators, can create agglomerations or clogging. The combined action of the spray jets and vibration cleans and disaggregates them before hydrodynamic separation from the metallic lead fraction.
How the PowerWash System Improves Separation Quality
The performance of the GME PowerWash system is based on the simultaneous action of three elements: uniform spreading with multi-stage tipping of the material in transit thanks to vibration, calibrated 0.6 mm screening slots, and high-pressure washing thanks to multiple sets of washing nozzles along the entire transit length.
The vibration distributes and tips the material so that all surfaces are exposed to washing.
The calibrated screening slots allow only fine material, such as lead paste, to pass through; larger metal and plastic elements are retained.
The stainless steel nozzles provide the energy needed to detach the lead paste from the retained surfaces. When these actions are properly balanced, the system produces a flow of pure lead paste and the cleanest solid fractions for downstream equipment.
Separation materials, mainly AGM, can clog the slots and block the screening of the paste. The intense vibration that continuously detaches this material from the screening deck and the high-pressure jets that break up this filamentary material allow for efficient and continuous operation even when loaded with AGM batteries.
The Key Point: washing quality determines final separation quality
Effective washing of Fractions 1, 4 and 5 on the vibrating screen is the key point of the complete mechanical separation line. The separation tank and hydrodynamic separator can operate correctly only when metallic lead, polypropylene and the heavier plastic or separator fraction arrive substantially free from lead paste.
If the washing action is insufficient, paste remains attached to the retained solids. This creates cross-contamination, increases the amount of lead-bearing material carried into the plastic streams and makes the final separation less precise. It can also increase recirculation, cleaning requirements and wear in the downstream process.
When washing is effective, the Pb Paste fraction is removed at the earliest suitable stage and the remaining solids exhibit clearer differences in their physical behavior. This allows each downstream machine to perform its specific task with greater stability and contributes to higher-quality recovered materials throughout the ULAB recycling plant.
Integration into a Complete ULAB Recycling Plant
The GME Vibrating Screen with PowerWash system is not an isolated washing machine. It is the interface between battery breaking and the final mechanical separation of the liberated materials.
After the hammer mill, the mixed crushed stream enters the vibrating screen. Lead paste, electrolyte and process water pass through the 0.6 mm slots and are directed to the appropriate paste and liquid-management sections. Pb Metallics, polypropylene and heavy plastic or separator materials remain above the deck and leave the screen as washed solids.
The polypropylene fraction is subsequently separated in the dedicated tank. The hydrodynamic separator then divides Pb Metallics from the heavier plastic and separator fraction. By preparing these streams correctly, the PowerWash stage supports a cleaner transition from battery breaking to material recovery and downstream lead processing.
Engineering Services Offered by GME
GME supports customers not only with machinery supply, but also with engineering, design and technical assistance services throughout the development of the recycling plant.
Project Feasibility Report
GME can support the first evaluation phase through a project feasibility report, helping customers define the technical requirements, expected process configuration and overall plant opportunities.
Site Design and Planning
The layout of a ULAB recycling plant must consider material flow, equipment positioning, safety, maintenance access and downstream integration. GME supports site design and planning to create an efficient plant configuration.
Model Selection and Proposal
Based on the customer’s production targets and process objectives, GME identifies the most suitable equipment configuration and prepares a technical proposal aligned with the plant requirements.
Model Selection Calculation
Correct machine selection requires technical calculation. GME supports model sizing and selection according to material flow, plant capacity and operating conditions.
3D Modeling and Drawings
3D modeling helps visualize plant layout, equipment integration, access routes and maintenance spaces before installation. This is particularly useful in complex recycling facilities where multiple machines and material flows must operate together.
Civil Design
GME can support the civil design phase, helping align equipment requirements with foundations, platforms, access areas and plant infrastructure.
Installation and Commissioning
GME provides technical support during machine installation, process setup and start-up, helping bring the recycling plant into operation under the intended process conditions.
Remote Diagnosis
Remote diagnosis allows technical issues to be assessed quickly, supporting plant operators with troubleshooting and operational guidance without always requiring an immediate on-site intervention.
Training Service
GME trains customer teams in equipment operation, process logic, routine checks and correct use of the recycling line.
Maintenance Schedule
A structured maintenance schedule helps preserve machine efficiency and reduce unplanned downtime. GME supports the definition of maintenance routines for critical equipment and process sections.
Why choose GME PowerWash technology for ULAB Recycling
For companies investing in lead-acid battery recycling, the washing and screening stage directly affects material purity, process continuity and the performance of the downstream separation equipment. It must remove a sub-0.6 mm lead-paste fraction without carrying larger metallic or plastic elements into the under-screen stream, while also cleaning the retained solids thoroughly.
The GME Vibrating Screen with PowerWash system is engineered for this requirement. Its vibrating perforated decks, 0.6 mm slotted openings and stainless-steel high-pressure nozzle system work together to detach lead paste, separate the fine and liquid phases, and prepare Pb Metallics, polypropylene and heavy plastic or separator materials for final recovery.
The result is a process-focused washing stage that improves the conditions for paste recovery, light-plastic separation and hydrodynamic separation. For plant owners and recycling operators, this means greater control over one of the most decisive sections of the complete ULAB recycling line.
FAQ
What is the main function of the GME Vibrating Screen with PowerWash system?
Its main function is to separate fine Pb Paste and electrolyte from the larger solid fractions discharged by the hammer mill. At the same time, it washes Pb Metallics, polypropylene and heavy plastic or separator materials so that they can be separated efficiently downstream.
Which fractions enter the PowerWash system after the hammer mill?
The incoming stream contains five principal fractions: Pb Metallics; fine Pb Paste; electrolyte; light polypropylene; and heavier materials such as PE, AGM, ABS and other plastic or separator components.
Why are the screening slots 0.6 mm wide?
The Pb Paste has a particle size below 0.6 mm. The calibrated slots allow the detached fine paste and liquid phase to pass through while retaining the larger metallic and plastic components above the vibrating decks.
How does the high-pressure washing system work?
Stainless-steel nozzles project concentrated water jets onto the moving material. Similar to the principle of an automatic car-wash tunnel, the system uses a relatively low water volume at high pressure to detach paste from irregular metallic, plastic and separator surfaces.
What remains above the screen after PowerWash treatment?
Pb Metallics, light polypropylene and heavy plastic or separator materials remain above the 0.6 mm decks. The polypropylene is then separated in a dedicated tank, while the hydrodynamic separator divides the metallic lead from the heavier plastic and separator fraction.
Why is washing quality the key point of the separation process?
The downstream equipment can separate the retained solids accurately only when they are substantially free from lead paste. Effective washing limits cross-contamination, improves the purity of the Pb Paste and plastic fractions, and supports stable operation of the separation tank and hydrodynamic separator.
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