Efficient grinding in the second grinding compartment with the classifying lining

The classifying lining provides efficient finer grinding of the coarse ground material. In the second compartment the material is primarily ground using pressure and friction, whereby the classifying lining retains the grinding balls with the largest diameter at the beginning of the compartment and the successively smaller balls at the end of the grinding path.

Optimum ball distribution
for efficient fine comminution
optimum size reduction
in combination with activator or wave plates

Technical details

  • Efficient grinding: Balls with the largest diameter are retained at the beginning of the compartment, balls with the smallest diameter at the end of the grinding path
  • A combination of classifying with two types of lifter plates is possible, with wave liners or progressive activator plates. Both kinds of lifter plates lead to a cascading motion of grinding balls, and an optimum material transport through the second compartment
Sortierpanzerung

more than 500 
mill shell linings
installed worldwide

Aren´t shell linings just wear parts for mill tube protection?

From our point of view, quite the opposite. The profiling of the shell lining plates creates the movement of the ball charge, which causes the grinding of the material. It is therefore essential for effective grinding in the mill and far more than just a wear part. The exact profile shape has to be defined depending on the ball sizes used, the rotation pace and the mill diameter. And thus, the shell lining has to be adapted to each mill individually.

Why do shell linings have different chromium contents?

The plates of the shell linings must not break during operation. If rough operating conditions are to be expected, a hard facing with a lower chromium content should be used. The chromium content often influences the service life of the hard facing, but not always. The ideal selection of the casting material is part of the standard of our machine and plant design. The design depends on the individual application conditions.

What is the best fastening system for the shell lining?

Any hole on the mill shell weakens the shell structure and is a potential leakage point. In addition, noise emission during operation is increased. Nevertheless, each type of fastening has its justification.

For coarse grinding in the first chamber, we prefer screwed solutions for DIN plates to ensure maximum availability and operational reliability. Alternative systems, with few or without screws, are used for fine grinding chambers.

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A story of efficiency

Efficiency in grinding is our heritage and our future.
Since 1925.

Making grinding processes as efficient as possible is a science in itself – one to which we dedicate our entire expertise and spirit of innovation. From the invention of the first MONOBLOC diaphragm to the technical fine-tuning of the separator QDK. How we became what we are today.