The jaw crusher breaks up the raw materials into needed feeding granularity, after that, the bucket elevator takes the material to the hopper and then the electromagnetic vibrating feeder sends them to the host' s hohlraum averaglly. In the rolling process of blade and grinding roller, the materials are feeded into the spaces of grinding rings which form the padding layer. The materials are grinded between grinding roller and grinding ring to get the purpose of making powder. After being grind, the powder is selected by classifier via the circle wind of the blower and the rough powder wil be back to the grinding room for regrinding. The qualified powder is brought into the power collection together with the airflow. The unqualified powder will be separated with the airflow by throwing to the out wall. All the air system of the machine is closed recirculation and operate under the condition of positive-negative pressure.