Rotor-beater colloid mill. The slurry to be ground is fed through a connection into the housing, where it passes between the beaters, which are mounted on the rotor rotating on the shaft, and counterpunches fixed stationary in the housing. Rows of rotor beats are located between the rows of counterpunches of the housing. The shredded material exits the nozzle. If the degree of comminution is insufficient, the slurry is passed through the mill a second time. The grinding housing can be cooled. The liquid intended for this purpose enters through the connection and exits through the connection.
Due to the high velocity of beads and particles of the mixture and their collision with counterparts, a significant cavitation effect develops in the mill (when bubbles formed in the liquid burst, emitting a shock wave and causing intense micro-flows of liquid).
For this reason, these mills are sometimes called cavitation pulverizers. They can also be used to produce and homogenize emulsions. The capacity of such a mill with a rotor diameter of 200 or 800 mm and a rotational speed of 3000 to 12,000 rpm is up to 100 kg of slurry per hour. Vibrocavitation colloid mill. The mill consists of a stator and rotor which are housed in a casing. There are longitudinal grooves on the surface of the stator and rotor. The slurry enters the annular gap between the stator and the rotor through a connector and exits through the connector.
When the rotor rotates on the shaft at a speed of 18,000 rpm, the slurry particles moving from the rotor grooves to the stator grooves make vibrations of high frequency, close to ultrasonic, and are crushed to a size of 1 micron. The mill can be cooled, for this purpose the cooling liquid is passed through the connections. The capacity of a vibrocavitation colloid mill with a rotor diameter of 500 mm is 500 to 700 kg of suspension per hour. For homogenization of ointments are also used special apparatuses – homogenizers, which have different devices. In homogenizers of one type of homogenizer coarse disperse emulsion under high pressure is forced through narrow channels and slits. In homogenizers of another type, the emulsion under the influence of centrifugal force arising from the rotation of the disk is forced through the slits in the disk, atomizing into a mist. The emulsion is fed through a hollow axis.
The principle of operation of homogenizer-dispersersers is to squeeze the product through narrow slits. The essence of homogenization is the use of pressure on liquids to divide the inclusions they contain into very small particles and create a constant dispersion for further processing of the product. There are many different types of homogenizers.
Rotary pulsation apparatuses (RPA) allow to significantly intensify the processes occurring in the preparation of such dispersed systems as emulsion, suspension and combined ointments.

RPAs are designed for preparation of highly dispersed, homogenized liquid emulsions and suspensions, as well as multicomponent compositions from hard-to-mix liquids with the temperature of the processed medium up to 95 °С. They combine the principles of centrifugal pump, disembrator, disintegrator and colloid mill. By means of pulsation, shock and other hydrodynamic effects occurring in RPAs, physical and mechanical properties of the produced products are changed and energy consumption of production is reduced due to intensification of technological processes. There are many foreign and domestic designs of various types of RPAs. The most widely used are submersible and flow-through (flow-through) type PPAs. Submersible type RPAs are usually made in the form of stirrers placed in a container with the processed medium. They are sometimes used to increase mixing efficiency by installing them in addition to existing agitators of other types (e.g., anchor agitators). Submersible RPAs are serially produced by the domestic industry under the name of hydrodynamic apparatuses of rotor type, as well as a number of foreign firms. Despite the constructive simplicity, submersible RPAs do not provide sufficiently homogeneous processing of the entire mass of the product. Flow-type RPAs are the most widespread. Their working bodies are mounted in a small body having branches for inlet and outlet of the processed medium. In the majority of designs the processed medium enters the inner zone of the device through the axial branch pipe and moves in it from the center to the periphery. There are known designs of PPAs, in which the processed medium moves in the opposite direction, moving from the periphery to the center. At such movement the degree of flow turbulization increases, at the same time hydraulic resistance of the device, power consumption” and heating of the treated medium increase. Separate modifications of PPAs can have working chambers with different flow direction.
According to the number of working chambers PPAs can be single-chamber and multi-chamber. Single-chamber units have two disks with concentric rows of teeth or cylinders with slots. One or both disks rotate. Multi-chamber apparatuses have more than two disks with teeth or slotted cylinders, resulting in two or more zones of active media treatment. In addition to the main working bodies (slotted cylinders, disks), RPAs can have additional working bodies designed to increase the efficiency of their work. Often as additional elements, knife blades installed on the rotor, stator or housing are used.