Magnetic filter are usually made by steel stainless and rare earth magnet. It remove ferrous contaminants from the product steam in wide range of applications. Plate magnet are fitted in different sizes and shapes hoppers, vertical ducts, intake opening and bag loading or unloading points. Plate magnet are made up by neodymium magnet and stainless steel plate. Reasonable layout bars can make magnetic field to be very strong, and high efficiency remove fine or weakly magnetic contamination from free flowing granular products.