Airswept Roller Mills - Bradley Pulverizer

Grind, Classify, and Dry in One Operation

Bradley Airswept Mills combine the fine grinding action of a pendulum roller mill with air stream classifying and fluid bed drying capabilities to produce precisely sized particles for a variety of applications. Sized to meet your application requirements, Bradley Airswept Mill systems are used in a variety of industries and can achieve:

Outputs of <1 to 150 tons per hour
Product fineness from 50% passing 150 microns to 99.9% passing 30 microns
Final products with less than 0.1% moisture from high moisture feeds containing up to 15%

Capacity of a given mill size is dependent on a variety of factors, including:

Material being ground
Fineness of the finished product
Amount of moisture in the feed to the mill

Performance Features

Unique over-driven design means low investment
Ground level access to wear parts and low feed
Less vibration and noise reducing maintenance costs
Simple solid block foundation
Gearbox oil does not need cooling
Fluid bed drying saves 25% on fuel costs
Belt drive allows optimum speed selection
Negative pressure air system ensures dustless operation

Grinding, Classifying & Drying in One Operation

GRINDING

Our flagship pendulum roller mills are equipped with three pendulum roll assemblies suspended from a rotating carrier. As the carrier rotates, centrifugal force causes the roll assemblies to swing outward against the stationary ring. Plows direct material from the mill floor to the grinding zone where it is ground using a combination of attrition and impact.

A continuous air stream carries pulverized material from the grinding zone up to a separator. Product sized material is collected while overized particles are rejected and recycled for further grinding. The conveying air stream can also be heated to fluidize and dry material being ground.

CLASSIFYING

Pulverized material from the grinding zone is carried by the air stream up to a separator located above the mill. From there, product size material is carried to a bag house or collection cyclone while oversize particles are rejected and returned to the mill for further grinding.

Bradley Airswept Mills can be equipped with many different styles of classifiers to meet customer application demands. To produce desired particle size distribution, Bradley Pulverizer offers both static and dynamic classifiers.

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DRYING

For processes that utilize high moisture feed materials, the conveying air stream can be heated for fluid bed drying of ground material. Hot air is introduced into the grinding zone of the mill to fluidize and dry ground particles for easier flow through the airswept system. This method of drying is also advantageous as it reduces costs of drying material.

Bradley Pulverizer Airswept mill diagram

Over-Driven Integral Gearbox Advantages

Bradley Mills are unique among ring-roll designs in that they are driven by an overhead integral gearbox – including our largest sized mills . The Bradley Mill gearbox sits above the grinding chamber which offers several advantages over competitor mills.

1. GEARBOX: The integral gearbox above the grinding chamber adds significant live mass to the pulverizer, reducing vibration and lower wear on the mill. This design doesn’t require oil cooling and is 10% more efficient than other mills.

2. FEED: Ground level grinding zone allows for a low-level feeder as well as a lower feed hopper and conveyor.

3. DRIVE: Bradley mills are V-belt driven which allow optimization of mill speed to ensure operation is quiet and output is maximized as well as easier maintenance as compared to oil or water cooled gearboxes.

4. GROUND LEVEL ACCESS: Wear parts at ground level allow for easier and safer maintenance of the roll assemblies and grinding ring.

5. FOUNDATION: Because the gearbox is above this mill, a simple, solid flat foundation block is used, which minimizes vibration and noise and reduces installation costs.

The unique over-driven design of the Bradley Pulverizer Air Swept Mill is more efficient than other mills resulting in a lower per ton operating cost. The mill’s robust construction means lower maintenance costs and less down time than other mills. The drive and gearbox configuration ensures vibration is minimized, operation is quiet and maintenance requirements are kept low for years – decades- of high performance. The end result is a simple, solid foundation with lower installation costs and a superior power-to-weight ratio.

Over Driven Design Advantages of Bradley Mills

Applications

Fertilizer Industry
Cement Industry
Coal & Coke Grinding
Limestone & Dolomite Quarries
Pellet Plants
Glass & Ceramics
Mining Industries
Oil Industry
Paint Manufacture
Desulphurization Process
Marble Processing
Miscellaneous

Standard Mill Specifications

Mill Sizes Figure

Mill Size	Mill Motor	Fan Motor	Maximum Feed Size
BM2	22 KW 25 HP	30 KW 40 HP	13 MN 0.5 IN
BM3	35 KW 50 HP	30-35 KW 40-50 HP	15 MN 0.6 IN
BM6	55 KW 75 HP	45-55 KW 60-75 HP	20 MN 0.8 IN
BM10	75-90 KW 100-120 HP	55-75 KW 75-100 HP	25 MN 1.0 IN
BM14	132-160 KW 180-200 HP	90-132 KW 120-180 HP	30 MN 1.2 IN
BM20	200-315 KW 270-425 HP	160-200 KW 200-270 HP	40 MN 1.6 IN
BM30	315-400 KW 425-535 HP	250-315 KW 335-425 HP	50 MN 2.0 IN
BM50	400-500 KW 535-670 HP	375-400 KW 500-600 HP	60 MN 2.4 IN
BM60	500-750 KW 670-1000 HP	375-600 KW 500-800 HP	80 MN 3.1 IN