Industrial Roller Mills

Williams Patent Crusher designs and manufactures high-quality industrial roller mills that dry, classify, and consistently deliver a uniform grind for almost any material. Our primary goal is to provide the best value for our customers and powerful productivity, all in one piece of equipment.

Since our industrial roller mills are used for a wide range of applications, our equipment allows for custom feeder selection to ensure a high-capacity, trouble-free operation regardless of the material being processed.

Explore the features of our equipment and discover for yourself why Williams Patent Crusher is the leading roller mill manufacturer in the industry.


Why Choose Williams as Your Roller Mill Manufacturer

Williams has been the industry leader for crushing and pulverizing equipment since 1871. Beyond their ruggedness and dependability, our equipment is innovatively designed to handle any application or material.

Our diverse product line and customized systems are carefully constructed to provide versatility and reliability in many applications. Built to last and able to handle materials from limestone and clay to gypsum and coal, Williams Patent Crusher roller mill systems are designed to provide years of efficient and consistent operation.

Interested in learning how the Williams Patent Crusher team can work with you to find the right size reduction solution? Contact our sales engineers today to talk about your specific needs.


What is a Roller Mill Used For?

Roller mills are essential equipment used extensively in the industrial processing sector, particularly for drying, grinding, and classifying a variety of materials. Roller mills use the centrifugal force of cylindrical grinding rolls to crush material into a uniform particle size and grind, dry, and classify. Some of its typical applications include the grinding, drying, and classifying coal, gypsum, limestone, clay, barite, pearlite, clinker, food products, grains, ores, and more.

The precise and controlled method of size reduction offered by roller mills makes them ideal for producing uniform particle sizes, which is critical in many industrial processes, from pharmaceuticals to mineral processing. The efficient and reliable crushing, grinding, and particle size reduction capabilities of roller mills make them versatile equipment in various industries.


Simultaneous Grinding Drying and Classifying

The innovative designs of roller mills from Williams Patent Crusher can perform simultaneous grinding, drying, and classifying functions in one continuous operation. This functionality is especially valuable in processing environments where both moisture content and particle size are critical factors. Our roller mills effectively reduce the size of materials like limestone and clay while also eliminating excess moisture. Learn more about Williams Patent Crusher equipment that is capable of simultaneous grinding and drying functions to find the ideal size reduction solution.


Features of the Roller Mill

Roller Mill Diagram - Williams Patent Crusher

As the acknowledged leader in fluid bed roller mill design, Williams Roller Mills provide years of reliable, consistent, and efficient operation. However, what truly sets our equipment apart is their ease of use and maintenance.

Learn more about the features of the Williams Patent Crusher vertical roller mill to see why it should be your top choice.


Product Control

The Williams roller mill system allows operators to have micrometer control of the finished product. Product size (regardless of turn down or grinding element wear) is controlled through the Williams High Efficiency Turbine (or spinner) Separator, equipped with a variable speed drive. Drive adjustment is controlled automatically by a patented control system.

Fluidized Bed Drying

Hot gas entering the grinding chamber below the grinding rolls fluidizes the entire grinding chamber. This promotes rapid and efficient drying of all material types, including lignite, clays, and sorbent. The large open area through the grinding chamber maintains particle terminal velocities while fluidized by heated gases.

External Gear Box

An external right angle gear box eliminates damage from heat and minimizes gear box contamination. Removing the gear box from the skid allows operators to change out the main vertical shaft.

Turn Down Ratio

Williams roller mills boast nearly infinite turn down while maintaining product size. The mill grinding rate is adjusted as a direct function of control system demand. The mill capacity is modulated by varying mill speed.

Mill Speed

Mill speed modulation varies the centrifugal force of the grinding rolls. Product capacity ranges from 100% to 0% when utilizing an optional variable frequency drive.

Bottom Discharge

Auxiliary Mill Bottom Discharge permits production of a second granular product, or beneficiation of the principal product, by removing the pyrites and tramp material. Both processes can be done simultaneously with fine grinding and drying.

How Do Industrial Roller Mills Work?

Roller Mill Operation and System Features Diagram - Williams Patent Crusher

Williams Patent Crusher centrifugal roller mills were designed with efficiency in mind. Each part works in tandem to efficiently dry, grind, and classify material, and the Williams Roller Mill System is completely automatic. Explore the diagram to the right to see how a roller mill works when designed by the experts at Williams Patent Crusher. To identify the specific parts, reference the list below:

  1. Feeder
  2. Roller Mill Base
  3. Centrifugal Main Mill Fan
  4. High Efficiency Turbine (or Spinner) Separator
  5. Cyclone Collector
  6. Baghouse
  7. Air Heater
  8. Recycle Line
  9. Discharge Spout

The feeder (A) deposits raw material into the base of the Roller Mill (B) at a rate determined by pressure variations with the grinding mill. Plows located ahead of each roller direct the material upward and between the grinding rolls and the heavy alloy steel bull ring, where it is ground to the specified size. The grinding rolls are free to swing out centrifugally, which forces them to bear upon and grind the raw material. Being free to pivot, the rolls automatically assume the proper position for grinding and need no adjustment to compensate for wear.

Once ground to size, material is swept out of the mill by the controlled air flow from the centrifugal main mill fan (C). The ground material passes through the adjustable Williams Patent Crusher High Efficiency Turbine (or Spinner) Separator (D). In the separator, an accurate size classification is made which allows product size material to be conveyed away from the grinding mill while oversize material is returned for additional grinding. Product-sized material is removed from the airstream by the Cyclone Collector (E). Typically, a conveyor or product storage bin will be located to accept the product as it exits from the bottom of the Cyclone Collector.

Baghouse Airborne fines that remain entrained in the exhaust gas from the Cyclone Collector are removed by a high-efficiency Baghouse (F), located downstream from the cyclone. The efficiency of the basic Roller Mill System becomes a highly efficient means of removing moisture from the raw material by simply adding an air heater (G).

Further refinements to the heater system allow the Williams Roller Mill to process hazardous dusts in a controlled low-oxygen atmosphere. A recycle line (H) that goes from the dust collector to the heater further reduces the oxygen level and is Williams' patented Inert Gas System.

Product beneficiation is possible in the Williams Roller Mill System by continuously removing impurities and uncrushables through a discharge spout (K) located beneath the grinding mill.

Key Components of the Williams Industrial Roller Mill

The Williams Patent Crusher team took great care when designing each component of our industrial roller mills. Learn how each part of the roller mill works to create a consistent, uniform product with maximized efficiency.


A. Primary and Secondary Fans fluidize and convey the product while removing moisture from the system.

Roller Mill Primary Fan - Williams Patent Crusher

B. The product from the grinding mill is separated from the air stream by the Cyclone Collector.

Cyclone on a DF-85 Roller Mill System - Williams Patent Crusher


C. Williams’ exclusive independent, External Gear Box arrangement provides trouble-free operation of the centrifugal roller mill.

DF-90 Roller Mill Transmission - Williams Patent Crusher

D. Hot gas for drying can be provided by a dedicated Air Heater or from an auxiliary source. Hot and cold tempering dampers provide accurate mill temperature and product consistency.

DF-60 Roller Mill Auto Lube System - Williams Patent Crusher


E. Automatic Journal Lubrication System and air seal can be supplied for 24-hour operation, maximum product production, and efficiency.

DF-60 Roller Mill Auto Lube System - Williams Patent Crusher

Feeders for Vertical Roller Mills

Williams industrial roller mills are used for a wide range of applications and materials, which means that the proper feeder selection is essential for high-capacity, trouble-free operation, and more efficient production.

You can customize your roller mill system depending on what material you need reduced. Learn more about the different types of feeders that can be furnished to fit Williams roller mills, or contact the Williams team today to discuss your specific customization requirements.


A. Add a vibratory feeder to your industrial roller mill system for increased capacity and to effectively reduce abrasive materials.

Roller Mill Vibratory Feeder - Williams Crusher

B. Add a Volumetric or gravimetric weigh belt feeder to ensure accurate amounts of material are fed into the machine every time.

Roller Mill Weigh Belt Feeder - Williams Patent Crusher


C. Add live bottom screw feeders to manage wet, sticky materials such as clay or filter cake. These feeders are one of the most efficient methods of metering materials being fed into the roller mill.

Roller Mill Live Bottom Screw Feeder - Williams Patent Crusher

Contact us today to discuss your application in detail with one of our experienced sales engineers. Call (314) 621-3348, email us at, or locate an agent near you.