What applications benefit from a lump breaker?

Lump breakers reduce agglomerated or clumped bulk solids to free-flowing material, ideal before feeding, drying, or conveying.

How do lump breakers protect downstream equipment?

By preconditioning material to a consistent size, lump breakers reduce surges, blockages, and wear on conveyors, feeders, and screens.

Can lump breakers handle abrasive or moist materials?

Yes, with the correct rotor and liner configurations, they effectively handle abrasive and slightly cohesive materials.

How do I choose the right lump breaker configuration?

Carrier engineers consider material size, hardness, and moisture content to recommend rotor geometry and operating speed.

What maintenance is expected with lump breakers?

Maintenance primarily involves inspecting and replacing rotor tips and wear liners—periodic and predictable, not reactive.

Molinos de desgaste / Desterronadores

Reclaim more usable sand while reducing waste disposal and new sand costs through aggressive attrition scrubbing and efficient lump reduction.

Achieve cleaner, more consistent reclaimed sand

Reduce energy use with efficient attrition action

Process more sand within the same footprint

Lower maintenance demands with a robust, wear-resistant design

Molinos de desgaste / Desterronadores

Combined attrition and screening of no-bake sand and core butts. Carrier attrition mills, also known as lump breakers, combine the technologies of attrition and screening of no-bake sand or core sand / core butts into a single unit. The attrition mill reduces sand lumps to grain size and removes tramp metal. Carrier’s heavy-duty attrition mills are designed for reliable use and low maintenance requirements and utilize a unique pneumatic gate that discharges metallic without shutting down.

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Features & Benefits

Elimina el metal atrapado en el sistema de arena.

Scrubbing process design reduces the LOI of chemically bonded sand.

El diseño del molino de desgaste de alta resistencia y frecuencia natural reduce el ruido y el consumo de energía.

Continuous operation inline discharge means no stopping to discharge debris – prevents tramp metal overload without stopping the unit.

El diseño de base aislada reduce las reacciones dinámicas transmitidas a los soportes o cimientos.

Simple, single direct drive provides reliable foundry operation.

Compact design makes it easy to fit into existing operations to return sand to the process system.

Easy installation for quick startup and a low maintenance design for minimum downtime.

Equipment Options & Accessories

Combined Attrition + Screening Unit

The attrition mill is equipped to both break lumps and screen sand

Automatic Metal Discharge Gate

To remove tramp metal (cores, gating, shot, foreign metal) from the sand system without shutting down the mill.

Replaceable Wear Liners

Because sand is very abrasive, wear liners protect the mill internals and are replaceable to simplify maintenance.

Natural-Frequency, Vibration-Based Design

The mill uses vibration-based attrition rather than heavy impact, which reduces noise, energy consumption, and mechanical stress on the system.

Isolated-Base Design

To minimize dynamic reactions transmitted to supports or building foundation

Direct-Drive Option

For reliable, low-maintenance power transmission under heavy loads / abrasive conditions.

Gentle or Aggressive Designs

Disponibles en diseños de baja o alta vibración para procesar la más amplia gama de materiales.

Custom Controls

Minimize field commissioning work with simple starter panels or customized PLC-based controllers complete with remote startup and engineering services.

Aplicaciones

No-bake Sand

Breaks down no-bake sand lumps into reusable grain-size sand.

Tramp Metal

Removes tramp metal while reducing sand lumps down to grain size.

Pepset Sands

Primarily designed for No-Bake systems (e.g., Phenolic Urethane No-Bake (PUNB), furan, or ester-cured).

Reclaimed Foundry Sand

Carrier’s attrition mill lowers LOI (Loss on Ignition) through its scrubbing action.

Core Sand & Core Butts

Reduces core butts and fused sand agglomerates.

Folletos

Foundry Equipment Solutions Brochure

Carrier Capabilities Brochure

CPEG Capabilities Brochure

Galería

Attrition Mill – Lump Breaker FAQs

How does an attrition mill work?

Vibratory motors shake a box into which no-bake sand lumps have been placed. The box has built-in, heavy duty screens to reduce the lumps to grain size, and also includes a final mesh screen to filter out any agglomerated grains that were not broken down.

What is an attrition mill used for in a foundry?

An attrition mill is used to break down sand lumps, remove tramp metal and agglomerates, and prepare the no-bake sand to be re-used or thermally reclaimed.

How does the mill help reduce disposal costs?

By reusing the sand rather than sending it to landfill, the disposal costs as well as new sand purchase costs are greatly reduced.

Is the unit designed for continuous or batch process?

An attrition mill can be used for either batch or continuous processes provided it is sized appropriately for the desired tons per hour rate. Attrition mills operate more efficiently at higher fill levels due to the abrading of sand through lump-on-lump attrition motion.

What maintenance is required?

Routine inspection of vibratory motors, wear plates, screens, and springs and replacement when necessary.