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Apr . 15, 2024 12:17 Back to list

Developments in iron ore comminution and classification technologies


The Vertimill® is a vertical stirred mill that uses a helical screw to impart motion in the charge. Mechanically, the Vertimill is a very simple machine with an agitating screw suspended into the grinding chamber, supported by spherical roller bearings, and driven by a fixed speed motor through a planetary gearbox. Figure 8.14 presents a schematic diagram of the Vertimill®. The screw rotates slowly such that the ball charge and slurry are not fluidized, but settle under gravity. The screw action pulls the ball charge up the center of the mill, and the charge eventually cascades over the edge of the screw, creating a general downward flow pattern at the mill perimeter. This pattern of flow, coupled with the low velocities involved, ensures that the grinding media and particles stay in contact with one another, thus enabling the efficient transfer of the drive energy into attrition and abrasion breakage throughout the charge. The operating conditions of the Vertimill® are very similar to those of the conventional ball mill in the sense that the percentage solids of the feed should be kept in the range of between 65% and 75% by mass. The power draw of the mill is directly linked to the mass of balls within the mill. The distinct advantage that the VTM™ has over the conventional ball mill is its ability to use media smaller than 25 mm more effectively.

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Figure 8.14. Schematic of the Vertimill®.

In the past 20 years, more than 60 Vertimill® machines have been sold for iron ore applications, with more than 20 of those in the last 2 years alone. Table 8.2 lists examples of the Vertimill® in Brazilian iron ore applications. The Metso Vertimill® is very common in regrind applications, but the industry quickly realized its potential in coarser applications as well.

Table 8.2. Vertimill® installations in Brazilian iron ore operations (Bergerman and Delbony, 2014)

Project Company Ore State Mill type Units Project status
Germano Samarco Iron Minas Gerais VTM-1500  1 In operation
Conceição do Mato Dentro Anglo American Iron Minas Gerais VTM-1500 16 In construction
  Vale     VTM-200  1 R&D
Serra Azul MMX Iron Minas Gerais VTM-3000 14 In construction
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