PBE News
PBE on the Web
Home
Article Index
Bookstore
Subscribe
Webinar
Sponsors
Agglomeration
Equipment

GEA Process Engineering
Hapman
Hosokawa Micron Powder Systems
K R Komarek

Airlocks, Blowers & Related Equipment
Coperion K-Tron
FLSmidth
GEA Process Engineering
Schenck Process
Smoot
Triple/S Dynamics
Vortex Valves

Bagging Equipment
Chantland
GEA Process Engineering
Hapman
Taylor Products

Bin Activators, Vibrators & Material Flow Aids
Acrison
Coperion K-Tron
FLSmidth
Metalfab Inc
Smoot
Solimar Pneumatics
Vac-U-Max

Bin Level Indicators
Coperion K-Tron
FLSmidth

Bulk Bag Fillers & Dischargers
Acrison
Chantland
Coperion K-Tron
Flexicon
GEA Process Engineering
Hapman
Machine and Process Design Inc
Metalfab Inc
National Bulk Equipment Inc
Nol-Tec
Schenck Process
Taylor Products
Tecweigh
Vac-U-Max

Bulk Bags
Chantland
Taylor Products
Tecweigh

Custom Services
Acrison
Chantland
Coperion K-Tron
Flexicon
FLSmidth
Jenike & Johanson
MECO Seal div of Woodex Bearing Co
Metalfab Inc
Nol-Tec
Tecweigh
Vortex Valves

Dryers
Coperion K-Tron
GEA Process Engineering
Hosokawa Micron Powder Systems
Marion Mixers
MECO Seal div of Woodex Bearing Co

Dust Collector Media
Camfil APC
Donaldson Torit
Schenck Process
Smoot

Dust Collectors & Related Equipment
Acrison
Camfil APC
Donaldson Torit
FLSmidth
Nol-Tec
Schenck Process
Smoot
Vac-U-Max
Vortex Valves

Explosion Venting & Suppression
Schenck Process

Feeders
Acrison
Chantland
Coperion K-Tron
Hapman
Jenike & Johanson
Machine and Process Design Inc
MECO Seal div of Woodex Bearing Co
Metalfab Inc
National Bulk Equipment Inc
Schenck Process
Smoot
Taylor Products
Tecweigh
Triple/S Dynamics
Vac-U-Max

Flow Meters
Acrison
Coperion K-Tron
Schenck Process

Linings (Abrasion Resistant)
FLSmidth
Vortex Valves

Material Handling
Acrison
Cablevey Conveyors
Chantland
Coperion K-Tron
Flexicon
FLSmidth
GEA Process Engineering
Hapman
Hosokawa Micron Powder Systems
Jenike & Johanson
Lorenz Conveying Products
Machine and Process Design Inc
Metalfab Inc
National Bulk Equipment Inc
Nol-Tec
Schenck Process
Sentry Equipment
Smoot
Taylor Products
Tecweigh
Triple/S Dynamics
Vac-U-Max
Vortex Valves

Mechanical Conveyors
Acrison
Cablevey Conveyors
Chantland
Flexicon
GEA Process Engineering
Hapman
KWS Manufacturing Co Ltd
Machine and Process Design Inc
MECO Seal div of Woodex Bearing Co
Metalfab Inc
National Bulk Equipment Inc
Taylor Products
Tecweigh
Triple/S Dynamics
Vac-U-Max

Metal Detectors & Separators
Industrial Magnetics

Mixers & Blenders
Acrison
Coperion K-Tron
FLSmidth
GEA Process Engineering
Hapman
Hosokawa Micron Powder Systems
Machine and Process Design Inc
Marion Mixers
MECO Seal div of Woodex Bearing Co
Metalfab Inc
National Bulk Equipment Inc
Nol-Tec

Particle Analyzers
Hosokawa Micron Powder Systems

Pneumatic Conveying Equipment
Coperion K-Tron
Flexicon
FLSmidth
GEA Process Engineering
Hapman
Industrial Magnetics
Lorenz Conveying Products
National Bulk Equipment Inc
Nol-Tec
Schenck Process
Smoot
Vac-U-Max
Vortex Valves

Product Reclaim Equipment
FLSmidth
GEA Process Engineering
Machine and Process Design Inc
National Bulk Equipment Inc
Vac-U-Max

Samplers
FLSmidth
Sentry Equipment
Tecweigh

Sifters, Screeners & Classifiers
Coperion K-Tron
Hosokawa Micron Powder Systems
Machine and Process Design Inc
Triple/S Dynamics

Size Reduction Equipment
GEA Process Engineering
Hapman
Hosokawa Micron Powder Systems
Jet Pulverizer Co
Machine and Process Design Inc
National Bulk Equipment Inc
Triple/S Dynamics

Sizing Tools
FLSmidth

Storage
Acrison
FLSmidth
Hapman
Jenike & Johanson
Machine and Process Design Inc
Metalfab Inc
National Bulk Equipment Inc

Vacuum Cleaning Equipment
Camfil APC
Vac-U-Max

Valves
Coperion K-Tron
FLSmidth
GEA Process Engineering
Lorenz Conveying Products
Schenck Process
Smoot
Vortex Valves

Weighing Equipment
Acrison
Chantland
Coperion K-Tron
Flexicon
Hapman
Metalfab Inc
National Bulk Equipment Inc
Schenck Process
Smoot
Taylor Products
Tecweigh
Vac-U-Max

Other
Acrison
Chantland
Coperion K-Tron
Flexicon
FLSmidth
Jenike & Johanson
Marion Mixers
MECO Seal div of Woodex Bearing Co
Tecweigh
Vortex Valves


Bulk-Online
 
» Skip to Continue point
Feature
photo tips for specifying a pin mill
Steve Coulombe, Sturtevant Inc.
 
photoA pin mill is one of the most commonly used impact mills for grinding bulk solid materials to medium fineness. The mill can accept feed materials with a particle size from 20 microns to 0.5 inch and a Mohs hardness up to about 4, reducing them to particles as small as 10 microns, depending on the mill type and feed size. This versatile machine handles a wide range of materials; some typical examples are hydrated lime, sugar, wet corn slurry, food ingredients, and fertilizers.
By specifying the right components and operating features for your pin mill, you can not only optimize the mill to reliably grind your material to the desired fineness but reduce equipment downtime for parts replacement and repairs. This can help your mill yield a final product with a very fine or homogeneous particle size distribution, stand up to an extremely abrasive or corrosive material, or safely reduce a heat-sensitive material without damaging it.
Your best source of help in specifying the mill is the pin mill supplier. With many years experience in supplying units that can successfully handle tough materials and operating conditions, the supplier can help you determine what it will take to keep your pin mill running smoothly with minimal downtime. Before you specify the mill, it's always a good idea to have the supplier test your material in pilot mills equipped with different pin configurations and construction materials, components made of appropriate wear- or corrosion-resistant materials, and other options. Running the test will typically require from 400 to 1,000 pounds of your material, depending on the results you need.
Once you have the test results in hand, you're ready to work with the supplier to specify a pin mill for top grinding performance with minimal maintenance downtime. Here are three practical tips for specifying your mill.
photoSpecify the right number and arrangement of pins.
Selecting the right number of pins and the appropriate pin arrangement (typically in rows) for your pin mill discs can not only help produce the final particle size distribution you need, but help control the narrowness of that distribution to meet your product requirements. The right number and arrangement of pins can minimize material buildup in the mill during grinding, reducing washdown requirements and the associated downtime. Careful pin specification can also reduce the amount of heat generated during grinding, helping you avoid heat-related material buildup problems and softening or melting of heat-sensitive particles or other particle damage. Rely on your pin mill supplier's experience for help determining what number and arrangement of pins are best for your application.
photoSpecify high-quality wear parts and appropriate options for your application
Any internal mill surface in contact with the material during grinding is subject to wear, and in a pin mill this includes the pins, the wear plate (that is, the disc surface on which the pins are mounted), the rotor, and the impact wall at the disc periphery. These parts can also be subject to corrosion if your pin mill handles a corrosive material.
Halting your grinding process to replace parts is costly; the lost production, maintenance labor cost, and parts cost can quickly add up. Choosing high-quality parts made of an appropriate wear- or corrosion-resistant material will reduce the replacement frequency and maintain your product quality while minimizing downtime and maintenance costs.
You can specify any of several construction materials for the pins, wear plates, and impact wall so they can resist wear and corrosion. Common wear-resistant materials include the following, ranging from those for less abrasive to more abrasive particles: mild steel, 40-RC (Rockwell C) tool steel, 60-RC case-hardened tool steel, chrome-oxide-coated 60-RC case-hardened tool steel, chrome carbide, tungsten carbide coating, and tungsten carbide. Corrosion-resistant materials include Type 304 and Type 316 stainless steel and special deep surface treatments like Stellite and other coatings.
photoOrder wear parts to keep on hand.
Stocking spare wear parts — pins, wear plates, impact walls, and rotors — in your plant's maintenance department will save you time and money by keeping your parts-replacement downtime to a minimum. Keeping parts on hand eliminates the time required for ordering parts from the pin mill supplier. While it's true that most suppliers stock critical spare parts for fast delivery to their customers, most of your pin mill's wear parts are likely to be specified for your unique application, so your supplier probably won't have all the parts you need for immediate delivery.
To learn more about pin mills you can read the article "Three tips: Specifying a pin mill for optimal performance and minimal downtime" by Steve Coulombe, Sturtevant Inc. You can also find articles listed under “Size reduction” in PBE's Article Index.
back to top ↑
Copyright 2013, CSC Publishing Inc. All rights reserved.
PBE-News provides information updates about the dry bulk materials processing and handling industry twice a month. The opt-out link below will allow you to opt out of future PBE-News. This will in no way affect our contact methods regarding your subscription or communication. Thank you.
 
PBE-News Editor
Christine Bernier Lienke
clienke@cscpub.com
 
 
 
PBE-News Designer
Kurt Beckman
kbeckman@cscpub.com