Classifiers

Buell Gravitational | Buell "GI" Gravitational - Inertial | Buell Centrifugal | FKI Cyclonic | Buell Mobile Classifiers | Buell Aggregates & "Manufactured Sand"

Air classification is a process of separating particles into groups or grades at cutpoints ranging from 10 mesh to sub-mesh sizes. Air classifiers complement screens in applications requiring cutpoints below commercial screen sizes and supplement sieves and screens for coarser cuts where the special advantages of air classification warrant it.

The applications of air classification are many and varied. Some of the more important uses are:

• Scalping off the coarse end from a pulverized product, usually for further milling. This prevents overgrinding and saves power.

• The "tailoring" of several size fractions from a heterogeneous mixture of particulate matter. In this application, each fraction has a different particle size distribution meeting commercial specifications or requirements of a dry beneficiation process.
• Scalping off the fine end of the product for "de-dusting," "de-fuming" or changing the flow, apparent density or other physical characteristics of the coarse fraction.
• Beneficiation of a mixture by the removal of impurities contained in a narrow particle size range of the mixture or the separation of mixed products having substantial difference in settling velocities in an air stream.

Fisher-Klosterman’s Buell Classifiers are available in a wide range of capacities for sizing, de-dusting or de-fuming dry particulates at feed rates from a few pounds per hour to 600 tons per hour. Four basic models are available, each offering cutpoint control in different size ranges.

1. The Gravitational-Inertial Classifier utilizes increased air velocities and it is designed for cutpoints from 50 mesh to 200 mesh.

2. The Centrifugal Classifier requires less handling equipment and ranges from 100 microns to 15 microns.

3. The Gravitational Classifier is ideally suited for coarser cuts ranging from 10 mesh to 100 mesh.

4. The Cyclone Classifier is designed to strip extremely fine particles from a product.

For the classification of dry solids between 10 mesh and 15 microns, pneumatic classifiers have several advantages over screens: Lower capital cost, lower operating cost, lower maintenance cost, greater on-line dependability, and less susceptibility to blinding.

Units can be supplied fabricated from carbon or stainless steel as well as with special features such as ceramic or refractory linings to combat abrasion.

Contact Us today to find out if an aerodynamic classifier will work for you.

For additional information, please review the following technical papers:

Buell Gravitational | Buell "GI" Gravitational - Inertial | Buell Centrifugal | FKI Cyclonic| Buell Mobile Classifiers| Buell Aggregates "Manufactured Sand"