The Falcon Centrifugal Concentrator, or Gravitational Concentrator, separates
materials based on differentiation of specific gravity in the centrifugal field. The
Falcon Concentrator has been successfully applied in recovering ultra-fine gold
from tailings. Recent work on recovery of fine hematite in Quebec has shown
limited success. This project was funded by the Permanent University Fund,
Minnesota Technology Institute (MTI), and USX. The project was funded in two
phases, first to study its feasibility; second to investigate its application in place of
flotation process that could do away with flotation reagent. The first part of this
report contains the initial operation data and analysis, and the second part was to
report the tests on pre-classified material, which was parallel to the project of preclassification
of flotation feed, also funded by MTI.
As presented in Figure 1, Falcon Concentrator contains a rotor assembly which
rotate up to 1800 rpm to create 300 G of force. The slurry fed through the tube to
the bottom of the rotator where centrifugal force immediately separates solids
and water. The solids are pinned to the cone wall forming a compact blanket.
Because of the expanding configuration of the cone, the solids move
progressively towards the large diameter and ultimately to discharge. During this
upward and outward progression, the blanket of solids diminishes in thickness.
Light particles are drawn into the pulp stream by the overlying layer of fastmoving
water and pass out with the tailings. The heavy particles migrate
underneath the layer will discharged by a pinch valve assembly at control
interval. These setup allowed continues operation at through put of 30 L TPH
with a C 1 0 model.
University of Minnesota Duluth, Natural Resources Research Institute, 5013 Miller Trunk Highway, Duluth, MN 55811-1442
Falcon Centrifugal Concentrator for Gravity Upgrading of Taconite Concentrate.
University of Minnesota Duluth.
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