CXY.G series of permanent magnetic drum magnetic pulley, half magnet system, the magnetic lines two, the internal use of high performance permanent magnetic material to form a composite magnetic lines, with high magnetic field strength effect of depth, and has the advantages of simple structure, low maintenance cost, use convenient wait for a characteristic, mainly for the following areas: magnetite concentrator crushing or the broken after roughing operation selected portion to reduce waste, lower work load, reduces the processing cost. In hematite ore reduction closed-circuit roasting operation, not fully restore mine [1] by the machine for separating returned after roasting. In the electric power industry of coal of iron, as well as other industries with ferromagnetic object material purification.