Efficiency made by the
Intermediate Diaphragm Monobloc

flow control and grain size limitation

Thanks to the material flow control and the limitation of the largest grain size by the intermediate diaphragm, the material stays in the first grinding compartment until it reaches optimum size; only then it moves into the second compartment. The separation of air and material flow, a major development by Christian Pfeiffer, ensures that so-called dead zones (zones without material being ground) directly behind the intermediate diaphragm are avoided. The result is a clearly more efficient grinding process.

due to monobloc design
due to flow control system
Easy maintenance
due to design finesse

Technical details

  • Separation of the ball mill into two or three compartment using the intermediate diaphragm
  • Optimum material flow control and grain size limitation
  • Unique separation of air and material flows in the low-wear material flow control: Avoidance of dead zones and lower wear on the grinding balls on the intermediate diaphragm – use of the entire grinding length of the second (and third) grinding compartment
  • 'Floating' installation reduces tension between the mill tube and the diaphragm structure. In this way: There is no tension between the intermediate diaphragm and the mill tube, the mill tube is stabilized, while at the same time, relative movements and deformations of the diaphragm are avoided
  • The structure of the intermediate diaphragm in the Monobloc® version supports the mill tube and works against deformation
  • Easier maintenance and replacement of main wear zones through division of the slotted and backside plates into two to four rings

more than 5,000 installations worldwide

How do diaphragms improve plant performance?

Modern diaphragms are designed to control the material flow and balance the material level in the first grinding chamber. The special feature of the Christian Pfeiffer intermediate diaphragms is that it directs the material into the second chamber separately from the air flow. This separation of material and air flow means that there is no unused zone behind the diaphragm. The material is fed directly into the second chamber at the backside of the diaphragm. As a result, the effective grinding length of the mill is fully utilized. In many cases, an increase in production of 3 - 6% can be achieved by the intermediate diaphragm MONOBLOC.

What is the average service life of a diaphragm?

The structure of a diaphragm has usually a service life of 10 years. Thanks to the Christian Pfeiffer MONOBLOC design and the floating connection, our diaphragms achieve significantly longer service lives in practice. The slotted and backside plates are replaceable wear parts that are highly dependent on the ground material.

According to the customer, the structure of the oldest Christian Pfeiffer diaphragm was in use in Latin America for 40 years.

What is meant by the self-cleaning effect of slotted plates?

The width and size of the slots define the material throughput and limit the maximum particle size that can pass the diaphragm. If the size reduction is insufficient, coarse particles get stuck in the slots of the diaphragm plates and become lodged. This reduces the throughput capacity and disrupts plant operation. It is therefore important to design the slots in such a way that material cannot get stuck permanently. Thanks to the circumferential slot arrangement and the milled groove for ball guidance, the cleaning effect by the grinding balls is very high. The material that has settled in the slots are pressed through by the passing balls and do not remain in the diaphragm.

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  • Process optimized mills durable, robust and efficient.

  • High quality Diaphragms

    for the optimal equipment of your ball mill

  • Complementary products

    for your process

  • Shell linings with innovative shape 

    for dynamic grinding processes.

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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.