Browsing by Subject "Hydrocyclone"
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Item Effect of Magnetized and Demagnetized Feed on Cyclone Performance(University of Minnesota Duluth, 1999-11-23) Benner, Blair RThe 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.Item The Effects of Temperature on Cyclone Performance(University of Minnesota Duluth, 2006-03) Benner, Blair RThe cyclone is widely used in the taconite industry to close grinding circuits. For a given cyclone geometry, the main operating variables are flowrate, feed size distribution, and slurry rheology. Generally the slurry density (percent solids) is used to approximate the slurry rheology. However, it is known that slurry temperature can also affect the rheology. The purpose of this test program was to determine the effect of temperature on cyclone performance as measured by cyclone weight split and cut size, D50• Two samples of cyclone feed were obtained from Evtac (now Utac). The samples were taken about 6 months apart.