Grinding and shaping method using vertical grinding mill

A grinding and shaping method using a vertical grinding mill configured to grind and shape a powder or a granular material, comprising:

• selecting a vertical grinding mill with thread pitch/diameter ratio of a spiral rotor according to a raw material to be ground;
• selecting the grade of a grinding medium and determining a filling factor according to requirements of particle sizes of the raw material and ground product, and adding the grinding medium into a grinding chamber of the vertical grinding mill;
• sequentially initiating a dust collector, an air blowing device, a driving device and a feeding device of the vertical grinding mill, wherein the driving device propels the spiral rotor to rotate, and the air blowing device blows upward from bottom of the grinding chamber;
• adjusting rotation speed of the spiral rotor of the vertical grinding mill to change cycling speed of the raw material and the grinding medium in the grinding chamber, thereby changing flow rate of the raw material in the grinding chamber;
• feeding the raw material into the feeding port at an upper end of the grinding chamber and then grinding the raw material;
• initiating a discharging device, and discharging the raw material from a discharging port at the lower end of the grinding chamber;
• wherein when selecting the vertical grinding mill, the thread pitch/diameter ratio of the spiral rotor is determined according to the Mohs hardness of the raw material;
• wherein when the Mohs hardness of the raw material increases, the thread pitch/diameter ratio of the spiral rotor of the vertical grinding mill decreases.