Metso Mining & Construction - Classifiers

Metso Gravitational Inertial Classifiers

The design of the Metso gravitational inertial classifier uses air flow, gravity and directional changes to achieve material cut points from 75 - 300 microns.

These units combine gravitational, inertial, centrifugal and aerodynamic forces to classify materials at cut points ranging from 75 - 300 microns (200 to 50 mesh). The feed material and primary air enter the top of the classifier in a downward direction. The air makes 120° change in direction and exits through the vanes carrying fine particles with it. The coarse particles, too heavy to make the turn, fall to the bottom to be discharged by a valve..


International Gravitational Inertial Classifier

Falling Springs Quarry Company, Dupo, Illinois.
28.800 C.F.M. 150 T.P.H.
(2) G.I.-108 Gravitational Inertial Classifiers
(2) C 72-36 Centrifugal Classifiers
Manufactured Sand and Mineral Filler

Aggregate Industries, MD 28,800 C.F.M. -- 150 T.P.H. (2) GI 108
Gravitational-inertial Classifiers and Storage Silo for Truck Load Out
of Fines Manufactured Sand

Secondary air, injected below the vanes, passes through the curtain of falling particles. Those particles near cut point in size are diverted by the secondary air stream into an eddy current within the heart-shaped chamber. The fines, some captured as they enter the unit and others drawn from the eddy, are carried by the exiting air to a fabric filter or cyclone for final recovery.

A simple, manual adjustment to the secondary air damper permits a change in the size of the fines being separated. The fact that there are no moving parts within the material flow stream reduces to a minimum the requirement for maintenance. For abrasive materials, liners are used in some areas to provide long life of the equipment.

Gravitational inertial classifiers are suitable for:

  • Dry production of manufactured sand from aggregate, replacing natural sand
  • Increased throughput over screen, increased production
  • On -2mm feed, high efficiency on -75 micron(200 mesh)fines removal

Main benefits of Gravitational inertial classifiers are:

  • Lower maintenance and operation costs (pumps, dredging, belt presses, flocculants)
  • Reduce moisture and minimize asphalt costs
  • Develop additional market opportunities for minus 200 mesh material

Tilcon, NY
57,600 acfm, 300 TPH
(4) GI-108 Gravitational Inertial Classifiers and Storage Silo for Truck Load out of Fines
Manufactured Sand

Boxley Materials Company, Roanoke, Virginia
28,800 C.F.M. 150 T.P.H.
(2),G.I.-108 Gravitational-Inertial Classifiers
Manufactured Sand


Main features of Gravitational inertial classifiers are:

  • No moving parts within material flow stream
  • Internal Lining - AR Plate or Ceramic
  • Reduce loading or eliminate settling ponds
  • Stationary and transportable units available

TILCON NEW YORK, INC
28,800 C.F.M. 150 T.P.H.
(2) GI-108 Gravitational Inertial Classifiers
Manufactured Sand

J.F. Allen Company, Elkins, West Virginia
14,400 C.F.M. 75 T.P.H.
(1),G.I. -108 Gravitational-Inertial Classifier
Manufactured Sand

Halquist Stone Company, Sussex, Wisconsin
28,800 C.F.M. 150 T.P.H.
(2),G.I.-108 Gravitational-Inertial Classifiers
To learn more about Gravitational Inertial Classifiers, go to the REQUEST MORE INFO button above or click on the DIRECT CONTACT button to reach Metso directly.                 

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