How do I produce ultra fine powder?

First, material enters into Jaw crusher, it will be crushed into small particles. Then it go into Ultra fine powder mill to be grinded into required size. After that, finished product meets the requirements will be discharged. There is also some finished product meets the requirements will enter into fine powder mill to be grinded again. By this way, it ensures that the pass rate of finished products. This is main procedure of producing Ultra Fine Powder.