Magnetic separation methods
DeVaney, Fred D. Consulting Metallurgist, Duluth, Minnesota.
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All materials possess magnetic properties. Substances that have a greater permeability than air are classified as paramagnetic; those with a lower permeability are called diamagnetic. Paramagnetic materials are attracted to a magnet; diamagnetic substances are repelled. Very strongly paramagnetic materials are classified as ferromagnetic and include such metals as iron, nickel, and cobalt, and such minerals as magnetite, pyrrhotite, and ilmenite. Such substances can be separated from weakly or nonmagnetic materials by the use of low-intensity magnetic separators. Minerals such as hematite, limonite, and garnet are weakly magnetic and can be separated from nonmagnetics by the use of high-intensity separators.
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