Hydraulic Roller Press (HRP)

The HRP (Hydraulic Roller Press) provides an excellent high grinding economy with a low investment.

FLSmidth Roller Breaker
  • Raw Meal Grinding
  • Cement Grinding
  • Operating the HRP

Key benefits

The HRP-R for raw meal lets you run the comminution process without adding water and with minimum power consumption.

  • Energy efficient
  • Low operational and maintenance costs
  • Especially beneficial for dry material
  • No use of water
  • Specially designed for raw meal grinding
  • Welded surface is stable and simple
  • Hinged frame for easy roller removal
  • Drying capacity can be included in the solution

How it works

The roller press for raw meal commutes raw meal by subjecting it to high pressure between the counter rotating rollers. For raw meal grinding, the HRP is very suitable.

With dry raw material, the grinding economy will be even higher because there is no need to add water to the roller press during the process.

Key Benefits

The HRP-C is a dedicated machine for clinker grinding that lets you comminution process run, with minimum power consumption.

The roller press grinds cement clinker, brittle material and slag by subjecting it to high pressure, producing micro-cracks in the material as well as a substantial amount of fine material.

The HRP-C can be applied in different combinations for clinker grinding.
It can run separately or in conjunction with a small ball mill, providing a simple and economical mill system.

As part of a ball mill upgrade, the HRP-C can increase capacity by up to 100% and it can reduce energy consumption by 20-30%, compared with traditional ball mill grinding systems.

Built on innovative roller press technology, the HRP is one of FLSmidth’s most advanced and efficient units. A highly flexible solution, it is suitable for both new installations and upgrades.

  • Energy efficient
  • Low operational and maintenance costs
  • Specially designed for clinker meal grinding
  • Welded surface, which is stable and simple
  • Hinged frame for easy roller removal
  • Drying capacity can be included in the solution

Design & Configuration

Wear lining
HRP rollers have a wear lining of welded hard-facing material and
worn roller surfaces are reconditioned by welding. If desired, spot repairs can be performed with the rollers in situ.

Controlled feed system
To facilitate a choke feed press, the HRP has a motorised feed-control gate that ensures the feed start is smooth and helps to adjust the throughput or power consumption of the press. The feed-control gate secures an overall smoother operation.

Configuration options
There are several ways that a roller press can be incorporated into a grinding system:

  • As a pre-grinder, the roller press grinds fresh feed that is then finish ground in a ball mill grinding circuit.
  • As a semi-finish grinder, the HRP-C operates in a closed circuit with a static separator and a dynamic separator, together with a ball mill. Fines are finish ground in a one-compartment ball mill. In this configuration, the HRP-C can be made even more compact and energy efficient by utilising a SEXPAX® two-stage separator in conjunction with a ball mill.
  • The HRP can operate as a finish grinder without a ball mill. Here the HRP operates in a closed circuit with a static and dynamic separator. This configuration keeps both operating costs and investment costs low.

Low maintenance costs

As well as the high grinding economy and the low investment, the HRP also has other benefits.

The few wear parts of the HRP reduce maintenance and operating costs.

The rollers are the only components exposed to wear from the grinding media, keeping the maintenance straightforward.

This means that the hourly cost of operation is kept at a minimum for the whole lifetime of the machine.


  • Bearing life is optimised by ample sizing
  • Pressurised and filtered oil lubrication for the main bearings improves lifetime and provides important information for preventative maintenance
  • Hinged frame allows easy roller removal
  • Worn grinding surfaces can be reconditioned by welding – spot repair or complete resurfacing can be performed with rollers in situ 


Learn how the HRP system works
HRP system