Ferromagnetic and superparamagnetic contamination in pulverized coal

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Although no significant major-element contamination is introduced by grinding coal in a steel pulverizer, abraded steel particles can conceivably affect the magnetic properties of pulverized coal. Magnetic and scanning-electron-microscope analyses of pulverized coal and coal fragments from the Herrin No. 6 seam in Illinois showed ferromagnetic and superparamagnetic contamination from the grinder. Significant changes in the magnetic properties of the coal were noted, indicating a total steel contamination of approximately 0.02 wt%. When coal samples were vibrated in the magnetic field of the vibrating-sample magnetometer, the superparamagnetic steel particles moved through the pulverized coal, and participated in the formation of multidomain clusters that in turn substantially affected the magnetization of the coal. ?? 1982.
Publication type Article
Publication Subtype Journal Article
Title Ferromagnetic and superparamagnetic contamination in pulverized coal
Series title Fuel
Volume 61
Issue 1
Year Published 1982
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Fuel
First page 81
Last page 86
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