Abstract: Introduce the structure,working principle,characteristics of scraping wheel disk driver.Analyse the dense medium content mixed in the products of Dawukou coal preparation plant,as well as the magnetic attenuation rate,grain size and phase characteristics of dense medium.The results indicate that,the dense medium in clean coal,middlings and gangue are lower,while in tailings it reaches up to 43.08 kg/t,that means 2.58 kg dense medium is lost from each ton raw coal.Among the lost dense medium,36 percent have stronger magnetism and smaller size,64 percent are intergrowth of heavy medium and quart,all these characteristics decide it’s easy to lose.The scraping wheel disk driver can recycle 0.70 kg dense medium from each ton raw coal,in which the magnetic material content is up to 85 percent,that can be directly recycled.The plant saves 3.36×106 yuan each year.