Ferromagnetic and superparamagnetic contamination in pulverized coal

Fuel
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Abstract

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.

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Publication type Article
Publication Subtype Journal Article
Title Ferromagnetic and superparamagnetic contamination in pulverized coal
Series title Fuel
DOI 10.1016/0016-2361(82)90297-6
Volume 61
Issue 1
Year Published 1982
Language English
Publisher Elsevier
Description 6 p.
First page 81
Last page 86
Country United States
State Illinois
Other Geospatial Herrin No. 6 Seam
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