Rotary mixer

A rotary mixer is a cylindrical, rotating device for loosening and mixing bulk materials. It is used in particular in the Pelletising and agglomeration used when powdery materials are to be processed into larger grains (pellets) by controlled moistening, binding or heating.

Rotary mixers are not precision mixers. They only work if the mixing materials are of the same type (bulk density, grain size, flowability, quantity ratios, ...).

Rotary tube mixers consist of an inclined, rotating tube in which the product moves continuously while rotating slowly. Built-in chicanes (e.g. ledges or impact surfaces) promote the mixing, turning and loosening of the bulk material.

Application in thermal process engineering

The preparatory pelletisation serves to increase the grain size and is always important,

• if: very fine powders (dusts) are processed.
• if continuous high-temperature processes (e.g. calcining, roasting) with direct firing take place.

Typical areas of application are

• the (e.g. as a preliminary stage before the rotary kiln), Cement production (e.g. as a preliminary stage before the rotary kiln),
• the Metallurgical industry (ferrous and non-ferrous metals),
• the Ceramics industry and c
• hemic processes with melting or firing processes

Process parameters

Through the Adjustable inclination of the rotating tube, the filling level and the Dwell time of the material can be influenced. This enables adaptation to different product properties and process requirements. The speed, the heat input (e.g. via jacket, hot gas flow or direct firing) and the moisture supply can also be controlled.