Schutte Hammermill provides industrial size reduction equipment for a wide range of materials and applications. Below are answers to common questions about hammer mills, particle size reduction, equipment selection, processing applications, performance, maintenance, and technical support.
1. Hammer Mill Basics
A hammer mill is a size reduction machine that uses high-speed rotating hammers to impact and break material into smaller particles. Material remains in the grinding chamber until it is reduced sufficiently to pass through the mill’s screen or grate.
Hammer mills are used for applications ranging from coarse crushing to fine grinding, depending on the equipment configuration, material characteristics, and desired finished particle size.
Material enters the hammer mill’s grinding chamber and is repeatedly impacted by hammers attached to a high-speed rotor. Impact between the hammers and material, along with particle-to-particle and material-to-machine impact, reduces the material in size. The reduced material exits through a screen or grate once it is small enough to pass through the openings. Rotor speed, hammer configuration, screen size, and material characteristics all influence the resulting particle size.
Hammer mills can process a wide variety of materials, including wood, biomass, agricultural products, food ingredients, chemicals, minerals, metals, electronic scrap, and other industrial materials. The appropriate equipment and configuration depend on the material’s properties and the desired processing result. Schutte Hammermill custom-configures equipment to suit the material and production goals of each application.
Hammer mills are used across recycling, wood processing, biomass, food processing, agriculture, chemicals, mining and minerals, and other industrial applications. Schutte Hammermill equipment is also used for specialized applications such as battery recycling, solar panel recycling, data destruction, animal feed, brewery and distillery grain processing, and spice grinding.
Coarse grinding produces a larger finished particle size, while fine grinding produces smaller particles. The appropriate grinding approach depends on the material, required finished particle size, production rate, and downstream process. Schutte Hammermill offers equipment configurations ranging from coarse size reduction to fine and ultra-fine grinding.
Hammer mills can provide controlled particle size reduction, high throughput, and flexibility across a wide range of materials and applications. Because screen size, rotor speed, and hammer configuration can be selected or adjusted for the application, hammer mills can be configured to achieve different finished particle sizes and production requirements.
2. Particle Size Reduction
Finished particle size is primarily controlled by the screen or grate through which material must pass before leaving the grinding chamber. Screen size provides approximately 70% of the control over finished particle size in the majority of hammer mill applications. The remaining control comes primarily from the force of impact, which is affected by rotor speed and hammer size and configuration. Material properties such as hardness, brittleness, and moisture content also affect the final particle size distribution.
Achieving a specific particle size requires matching the mill configuration to the material and processing objective. Screen size is a primary factor, while rotor speed, hammer size, hammer configuration, and material characteristics also affect the result. Schutte Hammermill can perform material testing to help determine the appropriate equipment type and configuration for a specific application.
Screen size establishes the maximum size of material that can pass through the mill’s discharge opening. In general, smaller screen openings produce a finer finished product, while larger openings allow a coarser product to pass through. The actual result also depends on material characteristics and the mill’s rotor speed and hammer configuration.
Hammer size, number, arrangement, and configuration affect the force and frequency of impact within the grinding chamber. The appropriate hammer configuration depends on the material being processed and the desired processing result. Schutte Hammermill configures its equipment according to the material characteristics and production goals of each application.
Higher rotor speeds increase the velocity and frequency of hammer impacts, generally producing more aggressive size reduction. Lower speeds can provide a less aggressive grinding action and may be appropriate for materials or applications requiring different processing characteristics. Rotor speed is one of the variables Schutte considers when configuring equipment for a specific application.
Throughput depends on multiple factors, including the material being processed, desired finished particle size, screen area and opening, rotor speed, hammer configuration, feed characteristics, and discharge method. Equipment size and configuration also play an important role. Because these variables interact, Schutte Hammermill evaluates the material and production requirements when selecting and configuring equipment.
Size reduction can substantially reduce the volume of certain waste materials, making them easier to handle, store, transport, or prepare for downstream processing. The amount of volume reduction depends on the material and the selected equipment and process configuration.
3. Throughput & Performance
Hammer mill capacity depends on the material, desired finished particle size, mill size and configuration, rotor speed, screen selection, hammer configuration, feed rate, and discharge method. Because these variables interact, published capacity should be considered in the context of the specific material and application.
Potential ways to improve throughput include optimizing screen selection, rotor speed, hammer configuration, feeding, and material evacuation. The appropriate changes depend on the specific application and should be evaluated together with the desired finished particle size and product quality. In some applications, a different mill configuration or multi-stage process may provide a better solution.
Reduced production can result from several factors, including worn hammers or screens, unsuitable screen selection, changes in feed characteristics, inadequate feeding or discharge, or other equipment conditions. Worn components can reduce throughput, affect product quality, increase particle-size variation, and increase energy consumption.
Maintaining the equipment’s wear parts, using an appropriate screen and hammer configuration, and matching rotor speed and feeding conditions to the application can help maintain efficient operation. Schutte recommends periodic inspection of wear components because worn parts can reduce throughput and product quality while increasing energy consumption.
Hammer wear is affected by the material being processed and the severity of the application. Abrasive materials generally cause faster wear. Hammer condition should be monitored regularly, and hammers should be rotated or replaced when their working edges become sufficiently worn or when uneven wear affects performance.
4. Applications & Materials
Yes. Schutte Hammermill offers size reduction equipment for electronic scrap and other metal recycling applications. Equipment can be configured for goals including volume reduction, material liberation, and recovery of valuable materials. The appropriate equipment depends on the specific scrap stream and desired processing result.
Schutte Hammermill offers equipment specifically for secure destruction and size reduction of data-bearing materials. The appropriate equipment depends on the type of material being destroyed, required particle size, throughput, and the customer’s destruction objectives.
Yes. Schutte Hammermill offers size reduction equipment for battery recycling and material recovery. Equipment options include the RAS Two-Stage Hammer Mill, RC Series Industrial Crusher, WA Series Industrial Hammer Mill, and DataKiller Pro. Battery processing requires application-specific consideration of the material and the desired downstream sorting, separation, and recovery process.
Schutte Hammermill offers several hammer mill and grinder configurations for biomass processing, including equipment for wood, agricultural residues, and other biomass materials. The appropriate configuration depends on the feedstock, moisture content, required particle size, and production goals.
Hammer mills and wood grinders are used to reduce wood waste, pallets, bark, trim scrap, and other wood materials to a controlled finished size. Depending on the application, Schutte equipment can be used for primary size reduction, secondary or finish grinding, or production of fine wood products.
Yes. Schutte Hammermill offers food-grade hammer mills for applications including grains, herbs, spices, and other food ingredients. Equipment can be configured in carbon or stainless steel construction depending on the application and processing requirements.
Yes. Schutte Hammermill provides hammer mills, lump breakers, and crushers for chemical, bulk solid, mining, and mineral applications. Equipment is configured according to material characteristics such as hardness, abrasiveness, moisture, and the required finished particle size.
Yes. Schutte Hammermill equipment is used to process agricultural products including grains, animal feed ingredients, brewery and distillery grains, and other agricultural materials. Equipment selection depends on the material and desired finished particle size and production rate.
Size reduction can support recycling by reducing material volume, liberating components from composite or bonded materials, and preparing material for downstream separation and recovery processes. The appropriate size reduction method depends on the material and the desired downstream recovery process.
Schutte Hammermill offers many options for electronic scrap and other metal recycling applications. Equipment selection depends on the type of e-scrap, desired particle size, throughput, and whether the objective is volume reduction, liberation, or preparation for downstream separation.
5. Selecting the Right Equipment
The right hammer mill depends on the material being processed, required finished particle size, desired production rate, feed characteristics, and downstream process.
Other considerations can include moisture, hardness, abrasiveness, feeding method, discharge method, and whether carbon or stainless steel construction is required. Schutte Hammermill custom-configures equipment around the material and production goals of each application.
Hammer mill size is determined by the material, required particle size, production rate, and other application-specific requirements. There is no single mill size that is appropriate for every material or throughput requirement. Schutte Hammermill uses application information and, when appropriate, material testing to determine the appropriate equipment size and configuration.
Horsepower requirements vary according to the material, desired particle size, production rate, and mill configuration. Schutte Hammermill’s material testing service can be used to help determine horsepower requirements for an application. Equipment is configured based on the specific material and production goals rather than using a single horsepower-to-throughput assumption for every application.
Important application information includes the material being processed, desired finished particle size, required production rate, feed method, discharge method, moisture content, hardness, density, abrasiveness, and whether the material is hazardous, corrosive, or hygroscopic. Information about the downstream process is also useful when selecting equipment. Schutte’s application data form collects this information as part of the equipment selection process.
Yes. Schutte Hammermill offers material size reduction testing to evaluate equipment capabilities and determine the appropriate equipment type and configuration for an application. Testing can also help determine horsepower requirements.
Shredding and grinding are both forms of size reduction, but they are generally used for different processing objectives and particle-size ranges. Shredders are commonly used for initial size reduction of larger or more difficult materials, while hammer mills can provide more controlled grinding to a specified finished particle size. In some applications, shredding and grinding are used together as multiple stages of processing.
There is no single piece of equipment that is best for every difficult material. Material properties such as hardness, abrasiveness, moisture, density, and friability influence equipment selection.
Schutte Hammermill offers hammer mills, crushers, lump breakers, and shredders that can be configured for specific materials and processing objectives. Material testing can help determine the appropriate solution.
6. Purchasing, Testing & Support
To request a quote, customers can complete Schutte Hammermill’s online application data form. The form collects information about the material, production requirements, feed and discharge arrangements, material properties, and downstream process. This information helps Schutte develop a proposal around the customer’s specific processing goals.
Yes. Schutte Hammermill offers material size reduction testing to evaluate equipment capabilities and determine the appropriate equipment type and configuration. Testing can also help determine proper requirements.
Yes. Schutte Hammermill custom-configures equipment based on the material being processed and the customer’s production goals. Factors considered can include material properties, desired finished particle size, throughput, equipment construction, feeding, and discharge requirements.
Yes. Schutte Hammermill maintains replacement wear parts for its current product offerings as well as Schutte Pulverizer and Buffalo Hammermill models. Available components include hammers, hammer rods, screens and bar grates, wear plates, bearings, and shredder components.
Yes. Schutte Hammermill offers solutions ranging from individual size reduction machines to complete turnkey systems. The appropriate system configuration depends on the material, production goals, feeding and discharge requirements, and downstream process.
The right size reduction equipment depends on your material, desired finished particle size, production rate, and overall process requirements. Schutte Hammermill can evaluate your application, perform material testing when appropriate, and recommend an equipment configuration based on your specific processing goals.
7. Maintenance & Replacement Parts
Hammer wear is affected by the material being processed and the severity of the application. Abrasive materials generally cause faster wear. Hammer condition should be monitored regularly, and hammers should be rotated or replaced when their working edges become sufficiently worn or when uneven wear affects performance.
There is no universal replacement interval because hammer wear depends on the material and operating conditions. Schutte recommends inspecting hammers regularly. Hammers should be rotated when the striking edge becomes worn and replaced when all available wearing edges are worn or when uneven wear affects operation. Schutte’s recommended inspection schedule calls for regular hammer inspection.
Screen replacement depends on wear rather than a fixed calendar interval. Schutte recommends regular inspection of screens or bar grates and replacement when excessive wear occurs. Screens should also be replaced when perforations become elongated or damaged, or begin to affect the intended finished particle size.
Regular inspection, timely rotation or replacement of worn components, and using the appropriate wear materials for the application can help maintain equipment performance and component life. Schutte recommends keeping commonly needed replacement wear parts available to reduce downtime.
Uneven hammer wear can result in an imbalance across the rotor and can contribute to vibration and reduced grinding efficiency. Schutte recommends replacing hammers in factory-balanced sets and maintaining the correct hammer arrangement during replacement.
Schutte Hammermill supplies replacement components including hammers, hammer rods, screens and bar grates, wear plates, bearings, and shredder components. Replacement parts are available for current Schutte product offerings as well as Schutte Pulverizer and Buffalo Hammermill models.