<span class="green">SAM</span> semiautogenious and autogenious mills

SAM semiautogenious and autogenious mills

BEnefit from our sag/AG mill design - based on robustness and ENSURING HIGH AVAILABLITY

Our robust autogenous and semi-autogenous mills ensure efficient self-comminution of the product within the mill. In many cases, a SAM mill can replace a high-maintenance combination of crushing and screening equipment, making it a reliable, cost-effective alternative. As with ball mills, the material inside is lifted by the rotary motion, falls down by gravity and is crushed in this way. In the case of particularly hard material or in order to accelerate the comminution process, grinding media can be added which additionally break up the material. If the throughput rate is to be increased in the future, a ball mill can be flexibly added downstream.

Get more done
at a lower cost with higher throughput
Easily find the perfect fit
from our wide range of sizes

Technical details

  • Robust head castings and shell fabrications resulting in low stress levels and longer operating life.
  • Mill designs are supported by a full suite of design analysis reports including rotating body finite element analysis, main bearing fluid film analysis, drivetrain steady state torsional analysis as well as gearless mill dynamic modal analysis and system stiffness analysis.
  • Gearing rated to the latest proven AGMA standards.
  • High value lubrication systems with potential for flywheel rundown circuits (eliminating nitrogen accumulators).
  • Flexibility in feed chute design to suit difficult ore characteristics (highly abrasive, sticky, etc.).

  • Customised discharge arrangements to suit trommel screens or vibrating screens.

  • Various feed end seal arrangements to get the best solution for sealing and liner maintenance.

SAM Autogen- und Semiautogenmühlen

more than 
100 ball  mill 
installations worldwide

How does comminution with an autogenous or semi-autogenous mill work?

In autogenous and semi-autogenous mills the material grinds mainly itslef. The feed material is lifted by the shell lining of the mill during rotation. Because of the gravity  the material falls down and breaks as a result of the material impact. If the material is very hard or if the crushing is to be accelerated, grinding media can be added to the autogenous mill. In this case we speak of semi-autogenous mills.

Why a large mill diameter with a short length?

When the product 

With coarser product finenesses, the large mill diameter is required to generate the trapping energy for comminution. If the product has to be ground up less finely, this requires a comparatively higher trap energy and in return a shorter residence time of the material in the mill, therefore a special length becomes irrelevant.

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  • Precise separators

  • High quality Diaphragms

    for the optimal equipment of your ball mill

  • Complementary products

    for your process

  • Process optimized mills durable, robust and efficient.

Our service


Competence Center

Precise analysis for the perfect result.

We analyse your product to design the most efficient grinding plant.

  • Technology center for material tests 
  • Laboratory for material analysis
Christian Pfeiffer pilot plant
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.