Nd and Pr-Nd alloy metal is mainly used for manufacturing NdFeB permanent magnet materials, it is the world's strongest permanent magnetic body, known as "the permanent magnet of the King." Use it instead of the other permanent magnet material to enable the device volume and weight decreased exponentially, resulting in a very wide range of applications. Now the main application areas: permanent magnet motors, generators, magnetic resonance imaging device, magnetic, audio speakers, magnetic drive, magnetic lifting, instrumentation, magnetic fluids, magnetic devices, etc., has become the car manufacturers, GM machinery, electronic information industry and cutting-edge technology essential functional materials. Beginning of this century, China's production of NdFeB permanent magnet materials surpassed Japan to become the world's largest producer, to become the fastest growing consumer of rare earth functional materials.