Magnetic properties of iron Sample Clauses

Magnetic properties of iron ore pellets The magnetic properties of the iron ore pellets was unknown at the onset of the ePellet project. Therefore, measurements were performed within the framework of the ePellet project to investi- gate these. One challenge in these measurement was to find a viable method of measurement. Using measurement methods developed for achieving high precision measurements when mea- suring on homogeneous materials may lead to skewed measurements if they are applied to gran- ular materials unless the particle size is very small compared to the measurement cell. For ex- ample, one common method for measuring permeability is based on a coaxial cell shorted at one end. In this cell the magnetic field strength decreases with distance from the center conductor, and any voids in the material under test close to the center conductor will skew the measurement towards lower permeability. The classic method to manage this problem has been to simply make the measurement cell larger, but this becomes impractical when working with materials with large particle size. For this work we attempted to find a measurement method better suited for coarsely granular materials. This is based on investigating different ways of keeping the material from coming in direct contact with the probe coil, and making the probe coil large enough that the field throughout the material remains fairly constant. Possible geometries include (but is not limited to): • A coil within a hollow within a spherical sample. belt running w/o pellets belt running with pellets belt still, test 1 belt still, test 2 0 −20 −40 Level (dB) −60 −80 −100 −120 −140 −200 −150 −100 −50 0 50 100 150 200 Offset (Hz) Figure 9: Received signal spectrum zoomed to the 200 Hz region • A coil surrounding a sample (for example cylindrical or spherical) with some space between coil and sample • A sphere within a pair of Helmholtz coils. Based on it’s mechanical simplicity we used the the second type of measurement in order to determine the properties of the materials relevant to this project (mainly sintered iron-ore pel- lets, but also un-sintered pellets are considered). Existing plastic bottles with simple geome- try were used for defining the sample volume: D=9cm L=19.5cm, with rounded ends (r1=5mm r2=10mm). Measurements with and without sample within a probe coil were repeated 5 times. The sample permeability and loss-tangent shown below was found by comparing the measured coil impedance to hybrid MOM-FEM simulations with di...
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