Browsing by Subject "Taconite industry"
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Item Bentonite Survey(University of Minnesota Duluth, 1999-10) Bleifuss, Rodney LThe objective of this study was to examine the mineralogical characteristics of the various bentonites in greater detail to determine if subtle differences in the mineralogy could be related to the chemical analyzes and physical test data and perhaps explain the anomalous plant performances reported. The study was based on field samples collected from four of the bentonite companies operating in Wyoming and on representative bentonite samples provided by the taconite plants operating in Minnesota. Chemical and physical tests were run on all of the samples. X-ray diffi-action .patterns obtained from the bentonite samples under different conditions: "as received", minus 2 micron-air dried, minus 2 micron-w/glycol, and minus 2 micron after heat treatment at 250°C.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.