Effect of Magnetized and Demagnetized Feed on Cyclone Performance
1999-11-23
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Effect of Magnetized and Demagnetized Feed on Cyclone Performance
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1999-11-23
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University of Minnesota Duluth
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Technical Report
Abstract
The hydrocyclone is the primary device used to close the grinding circuits in the
taconite industry. The cyclone's major advantages are high capacity, low maintenance,
and relatively small size. The main drawback to the cyclone is the fact that it makes a
split based on specific gravity as well as size. This has the effect of returning liberated
or nearly liberated magnetite back to the ball mills for overgrinding. It is well known that
fine magnetite particles will flocculate in the presence of a magnetic field and that these
floes settle as pseudo large particles. Therefore, it is reasonable to assume that fine
magnetite in cyclone feed would also behave as pseudo large particles and report to the
underflow. A number of the early taconite plants included demagnetizing coil on the
cyclone feed line. However, plant data on the effect of the demagnetizing of cyclone feed
is not readily available, and since there is not a general agreement among plants as to
the benefits of demagnetizing the cyclone feed, this project was undertaken to determine
the effect of magnetizing and demagnetizing cyclone feed.
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University of Minnesota Duluth, Natural Resources Research Institute, 5013 Miller Trunk Highway, Duluth, MN 55811-1442; Sponsored by the Permanent University Trust Fund
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Benner, Blair R. (1999). Effect of Magnetized and Demagnetized Feed on Cyclone Performance. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/188346.
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