Figure 17.6 Methods of mechanical comminution to obtain fine particles: roll crushing, ball mill, and hammer milling. F. Mechanical alloying. 9 Powders of two or more metals are mixed in a ball mill . 9 Under the impact of hard balls, the powders fracture and bond together by diffusion, forming alloy powders.
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method is more efficient in achieving fine particle size. Rod mills: Horizontal rods are used instead of balls to grind. Granularity of the discharge material is 40 10 mm. The mill speed varies from 12 to 30 rpm. Planetary mill: High energy mill widely used for producing metal, alloy, and composite powders. Fluid energy grinding or Jet milling:
18.104.22.168 Ball mills. The ball mill is a tumbling mill that uses steel balls as the grinding media. The length of the cylindrical shell is usually 11.5 times the shell diameter . The feed can be dry, with less than 3% moisture to minimize ball coating, or slurry containing 2040% water by weight.
With the IsaMill horizontal stirred media mill , it is possible to achieve energy savings of 20 30 % compared to conventional ball mills 10 in various applications. High energy savings are also achieved with vertical flow stirred media mills .
The ball mill system consists of one turn disc and two or four bowls. The turn disc rotates in one direction while the bowls rotate in the opposite direction. The centrifugal forces, created by the rotation of the bowl around its own axis together with the rotation of the turn disc, are applied to the powder mixture and milling ...