Browsing by Subject "Taconite ore processing"
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Item Correlation of Metallurgical Testing of Mine Samples to Plant Feed and Concentrate(University of Minnesota Duluth, 2007) Benner, Blair RItem Development of a Bed Permeability Test for Iron Ore Sintering(University of Minnesota Duluth, 2012) Englund, David JItem Development of a CFD Primary Cooling Fan Model for Prediction of Air Flow in the Primary Cooling Zone of Line 2 at United Taconite(University of Minnesota Duluth, 2008) Englund, David JA CFD model of the Line 2 Primary Cooling Fan (3A) has been developed and demonstrated to be capable of reproducing the fan curve as supplied with the fan. The effect of air temperature and inlet damper position have been simulated and used to produce a series of flow-pressure curves for the unit as it operates in the plant. The plant fan model appears capable of reproducing the air survey velocity pressure profiles measured on July 11, 2006. The United Taconite CFD Cooler Model was then used to develop a family of system resistance curves based on cooler operating parameters. The fan and system resistance curves, when combined, allow the fan operating point to be defined, from which flow can be predicted. Several linear models were developed and then used to predict plant performance, using the July 11, 2006, operating point. The predictions fall within 8% on a volume flow basis, within 6% on a mass basis. Additional operating points are needed to demonstrate the model's predictive capability over a flow range. Based on the results in this report, it appears possible that an on-line flow prediction model could be developed with additional research.Item The Effect of Demagnetizing Cyclone Feed on a Plant Cyclone Performance(University of Minnesota Duluth, 2009) Benner, Blair RThe effect of demagnetizing the cyclone feed was tested at the Minorca plant under the Iron Ore Cooperative Program. The plant tests were conducted by Minorca personnel. Tests were run at cyclone feed pressures of 12, 14, and 16 psi with and without the demagnetizing coil being energized. Two test series were run at each pressure on different days. Samples were taken of the rougher concentrate (cyclone feed could not be accurately sampled), cyclone underflow and cyclone overflow. The samples were filtered and dried at Minorca and the dried samples were sent to Coleraine. They were screened through 500 mesh and the individual screen fractions were analyzed for magnetic iron (Satmagan) and silica. Results from the chemistry by size fractions were balanced using the USIMPAC program. There was good agreement between the measured and balanced data. These results indicated that the main effect of the demagnetizing coil was in the minus 500 mesh fractions. The amount of minus 500 mesh material reporting to the underflow was significantly lower when the coil was energized. Also, the silica content of the minus 500 mesh fraction in the underflow has higher, and the amount of minus 500 mesh material in the cyclone overflow was higher when the coil was on. The USIMPAC program was used with the balance data to calculate the cyclone split size, d50, and apparent by-pass for the magnetic iron and silica portion of the cyclone feed. Having the coil on or off had little effect on the d50 values for either the magnetic iron or the silica, but having the coil off increased the magnetic iron apparent by-pass by about 100 percent. Computer simulations using USIMPAC were run using previous plant data and the cyclone parameters determined above. However, this produced unrealistic results, since the previous data had a significantly coarser cyclone split. Since the cyclone splits were essentially unaffected by the coil, simulations were run with the previous data splits and the current apparent by-passes. This simulation showed an increased circulating load, but little overall effect on the line performance. Test work conclusively showed that the use of a demagnetizing coil on the cyclone feed at Minorca will significantly reduce the amount of fine iron reporting to the cyclone underflow, which should improve line performance.Item Final Report: Shallow vs. Deep Bed Sintering(University of Minnesota Duluth, 2010) Englund, David JItem Investigation in Production of Iron Ore Concentrates with Less Than 3 Percent Silica from Minnesota Taconites – Report One – Minntac Concentrate: A Final Report(University of Minnesota Duluth, 1991) Benner, Blair R; Bleifuss, Rodney LItem Investigation in Production of Iron Ore Concentrates with Less Than 3 Percent Silica from Minnesota Taconites – Report Three – Hibtac Concentrate: A Final Report(University of Minnesota Duluth, 1991) Benner, Blair R; Bleifuss, Rodney LItem Investigation into Production of Iron Ore Concentrates with Less Than 3 Percent Silica from Minnesota Taconites Final Report to the State of Minnesota and the American Iron and Steel Institute(University of Minnesota Duluth, 1991) Iwasaki, IwaoItem Liberation Characteristics of Taconite Plant Feeds(University of Minnesota Duluth, 2007) Ersayin, SalihItem Mercury Release from Taconite During Heating(University of Minnesota Duluth, 2005) Benner, Blair RThe taconite industry is under pressure to reduce the emissions of mercury from their induration process. Previous studies have indicated that greater than 90 percent of the mercury in the green balls being fed to the induration process is vaporized during the induration. The Minnesota DNR is in the process of conducting a bench-scale study to determine the rate of mercury release as a function of temperature during the heating of taconite. This program is a supplement to that work. The objectives of this program were to determine the role of oxidation in the release of mercury at various temperatures and to provide samples of heated material for Mossbauer spectroscopic analysis.Item Next Generation Metallic Iron Nodule Technology in Electric Arc Steelmaking – Phase II(University of Minnesota Duluth, 2010) Fosnacht, Donald R; Iwasaki, Iwao; Kiesel, Richard F; Englund, David J; Hendrickson, David W; Bleifuss, Rodney LItem Oxygen Sensor Validation and Analysis of Process Air Oxygen Content at United Taconite(University of Minnesota Duluth, 2007-08) Englund, David J; Davis, Richard ACFX-TASCflow CFD Fortran formerly used to simulate magnetite oxidation and heat transfer between a pellet bed and cross flow gas stream has been revised and converted to ANSYS CFX 11 Command Expression Language for use in CFX11 CFD Cooler models. The conversion has been validated and found to yield consistent results when compared to the previous FORTRAN version. However, revision of the heat of reaction expression for magnetite oxidation now generates more heat release in the bed than the previous version, yielding higher predicted gas and solids temperatures under similar operating conditions. Future studies should focus on methods of estimating pellet entry temperature, incoming magnetite content, and cooling fan flow from plant measurements, to determine if current methods of estimation over-predict magnetite mass flow and solids entry temperatures, and under-predict cooling fan flow rates, as a means to resolve the trend toward higher temperatures in the model simulations. Most of the existing TASCflow cooler grids were found incompatible for CFX 11 simulations, necessitating development of new grids using Solid Works modeling software.Item Pot Grate Induration Simulator(University of Minnesota Duluth, 2007) Englund, David J; Davis, Richard AItem Production of Low-Silica Concentrates from Mesabi Taconite(University of Minnesota Duluth, 1993) Benner, Blair RItem Production of Low-Silica Concentrates from Mesabi Taconite – Report 2 Column Flotation(University of Minnesota Duluth, 1993) Benner, Blair RItem A Purpose Oriented Magnetic Separator: Skimmer(University of Minnesota Duluth, 2005) Ersayin, SalihItem Re-Examination of the Relationship between Davis Tube Data on Drill Core and Actual Plant Operation(University of Minnesota Duluth, 2006) Benner, Blair RItem Taconite Concentrator Modeling ‐ 2005(University of Minnesota Duluth, 2005) Ersayin, Salih