Intensive mixing of fine materials

Single-shaft continuous mixer


Single-shaft continuous mixer

The single-shaft continuous mixer of type MFKG is a continuous mixing system that was developed for the intensive mixing of fine materials. Dry and moist, pasty as well as suspension-like mixtures can be produced continuously with the single-shaft continuous mixer. The special shape and arrangement of the mixing tools ensures an intensive mixing process. What sets the BHS single-shaft continuous mixer apart is the self-cleaning, flexible rubber trough, which prevents build-up on the inner trough wall. Liquids are added through nozzles in the inlet area, which facilitates early and extensive moistening of the entire feed material.

Benefits at a glance:

  • Consistently superior mixture quality
  • Self-cleaning rubber trough
  • Large maintenance flap
  • Secure investment thanks to high operational reliability
  • Low wear
  • Robust design

Consistently superior mixture quality

The design of the mixer inlet, the shape and arrangement of the mixing tools and the selection of the appropriate speed ensure a consistently high mixture quality. The high speeds cause highly turbulent relative movements in the mixture throughout the entire volume of the mixing trough, thus delivering consistently homogeneous mixing results in a very short time. Moreover, undesirable agglomerations are reliably broken up by shear forces.

Self-cleaning rubber trough

A unique selling point of the MFKG single-shaft continuous mixer is the self-cleaning process of the rubber trough. The pulsating motion and flexing effects of the rubber jacket prevent hardened mixing material from caking on the trough wall. Owing to this design, the mixer continuously cleans itself during operation.

Large maintenance flap

The rubber trough of the mixer is split in the longitudinal direction over the entire mixing section. This results in a large and easily accessible maintenance opening. Gas springs or hydraulic cylinders assist in operating the maintenance flap.

Secure investment thanks to high operational reliability

Even under the most difficult of conditions, the robust, durable design ensures maximum operational reliability and thus long-term investment security.


Optimized mixing process [1]

The BHS single-shaft continuous mixer’s rapidly rotating mixing tools greatly accelerate the various components of the formulation. The centrifugal force along the inner wall of the mixer thus creates a ring of mixed material with turbulent zones. The mixing tools generate highly intensive relative movements of the mixed material. This results in an optimal mixing action and a consistently high level of homogeneity. Materials that are generally difficult to mix or that are introduced in vastly different proportions can also be processed.

Inlet chute with efficient liquid injection [2]

In the single-shaft continuous mixer MFKG, liquids that are part of the formulation are only not added in the mixing zone, but also – in contrast to conventional systems – directly in the mixer inlet using special nozzles. This creates a wide spray mist that perfectly moistens all particles of the feed material already during feeding. The mixing tools subsequently ensure an even and intensive mixing of the pre-moistened mixture.

High-performance drive [3]

The drive configuration and performance is parameterized according to the application and the customer’s requirements. The standard drive system comprises a high-performance electric motor, an easily accessible V-belt drive and a robust, highly efficient worm gear. Alternative drive concepts can be implemented to accommodate special requirements.

Customized mixing tools [4]

Depending on the application, the mixer can be equipped with different mixing tools to achieve optimum material acceleration, relative movement and shearing effects. The mixing arms and blades are easily exchangeable. The mixing shaft is smooth to prevent caking.

Large maintenance flap [5]

Thanks to a large maintenance hatch, the mixer is easily accessible across the entire mixing section. Maintenance work can thus be carried out quickly and easily.

Seals [6]

Depending on the task, special axial face seals or gas seals secure the mixing shaft to prevent mixing materials from entering the shaft bearings.

Rubber trough

Self-cleaning rubber trough

Self-cleaning rubber trough

The mixing trough of the MFKG single-shaft continuous mixer consists of a flexible rubber jacket tightly fitted into a steel frame. It is made from a highly durable industrial material that is resistant to temperatures of up to 150 °C even in continuous operation. During operation, slight vibrations and flexing effects of the rubber trough prevent caking of hardenable elements of the mixture on the trough wall. This ensures a continuous self-cleaning process during mixer operation. Due to the elasticity of the rubber jacket, the friction loss caused by caking is reduced and, in addition, the wear of the mixing tools is significantly reduced.


Automatic central lubrication

Automatic central lubrication

When the machine is in operation, the central lubrication unit continuously supplies the internal shaft seals with barrier grease, thus reducing maintenance work.

Water control system

Water control system

Depending on the amount of solids added, liquids are introduced via a fully automatic metering station. This consists of a flow meter, control valve, metering valve, pressure regulator and pressure switch.

Hydraulics-driven cover opening

Hydraulics-driven cover opening

A hydraulic actuation mechanism is available to allow for easier and faster opening of the machine cover for maintenance and inspection.

Auxiliary motor for mixer shaft

Auxiliary motor for mixer shaft

An auxiliary motor can be fitted for slow or cycle-based rotation of the mixer shaft. This allows for hassle-free cleaning and maintenance.


ATEX design

The mixer and its peripheral devices can be configured according to the respective ATEX zones. BHS-Sonthofen meets all requirements and is ATEX certified.

Stainless steel design

To cater to special requirements, such as corrosive mixing products, we offer to manufacture the single-shaft continuous mixer from stainless steel.

Fields of application

Production of suspensions and pastes

Coal dust suspensions, backfill, mortar suspensions, ash suspensions etc.

Stabilizing sludges and soils

Sewage sludge, chalk sludge, iron arsenate sludge, paper sludge etc.

Humidifying dusts

Fly ash from waste incineration plants, fly ash from power plants, foundry dust, limestone powder etc.

Continuous dosing and weighing


Bulk flow measuring device
Non-contact flow measurement by ultrasound
Double weighing
Belt weigher


Screw Conveyor
Rotary valve
Vibrating chute
Box feeder

Technical specifications

Performance data
rate 1)
particle size
Drive power 2)

MFKG 0313

10 - 20 t/h12 mm150 °C9,2 - 22 kW 3)

MFKG 0520

20 - 50 t/h16 mm150 °C37 kW 3)

MFKG 0728

50 - 100 t/h16 mm150 °C45 - 55 kW

MFKG 1032

100 - 300 t/h16 mm150 °C90 - 132 kW

MFKG 1237

300 - 450 t/h16 mm150 °C110 - 160 kW

1) The bulk density of the specific input materials must be specified for selection of the suitable mixer size.
2) The throughput parameters (max. particle size, bulk density, etc.) of the specific input materials must be specified for selection of the suitable drive power rating.
3) Drive via bevel gear motor.

Dimensions and weights
TypeL1 4)L2
 Rubber trough
 Rubber trough

MFKG 0313

1.000mm1.300 mm350 mm2.200 mm1.200 mm620 mm1.110 mm700 mm900 kg

MFKG 0520

1.560 mm2.000mm530 mm3.000 mm1.400 mm815
1.420 mm900 mm2.500 kg

MFKG 0728

2.300 mm2.800mm750 mm3.900 mm1.600 mm1.150 mm1.880
1.200 mm3.700 kg

MFKG 1032

2.550mm3.200 mm1.000 mm4.700 mm2.200 mm1.400 mm2.230
1.500 mm5.800 kg

MFKG 1237

3.000mm3.700 mm1.250 mm5.200 mm2.400
1.800 mm8.500 kg

4) Dimension from center of mixer inlet to center of mixer outlet.
5) Weight for standard design without accessories.

All specifications apply to the standard design. Technical data for customized designs may differ from the specified data. All technical data may change due to development. Subject to modification without notice.


Tests give certainty

Which mixer is the right one for your application? Don’t leave anything to chance. Leave it to our team of process consultants. Working together with you, our specialists will test the material and develop a tailor-made solution for you.
“Single-shaft continuous mixer (MFKG)” brochure
“Mixing & crushing” overview brochure
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