There are five basic materials used in the construction of magnetic separators: Alnico aluminium- nickel-cobalt), ceramic (barium-ferrite), samarium-cobalt (first generation rare earth), neodymium-iron-boron (second generation rare earth) and electromagnets.
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This complete item is approximately 2000 words in length, and appeared in the September/October 2003 issue of Bulk Materials International, on page 16. To access this issue download the PDF here.