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Magnets and Magnetic Separation Q&A

  •   Are there different strengths or types of magnets available, and if so, how do I know which one would be best for my application?

    Answered September 19th, 2012 by Expert: Dennis O'Leary

    Typically users will choose between ceramic or rare earth permanent magnetic circuits in the dry particulates marketplace. In general, ceramic is chosen when the main goal is “capital” protection- think large tramp iron like nuts, bolts, knives and screwdrivers which cause damage when introduced to downstream equipment. Conversely, rare earth is optimal for “consumer” protection as its strength and holding capabilities far exceed that of the ceramic magnet, allowing it to capture small and very weakly magnetic fines. In all processing facilities there exists an opportunity for metal shavings, filings, iron powder and items like wire mesh to enter the product stream; rare earth magnets will capture this tramp iron throughout the facility if properly located in the processing stream(s). Specialty materials like Alnico and Samarium Cobalt – both used for high temperature applications- and electromagnetic circuits – for larger tramp iron on belt -conveyed product like you would find in a mine or power plant – are also available, although are used to a much lesser extent in this market segment.