The mechanical mill 3000 is suitable for green petroleum coke and green needle coke below 10mm，which can be used to make ultra-fine powder, The material is crushed by the collision between the high-speed rotating cutting block and the grinding chamber teeth, at the same time, the material particles generate squeezing, collision, friction and shearing effects between them. After grinding, the raw materials turned into 5-75μm ultra-fine powder.