The use of the rotating magnetic field for technological purposes enlarges in the latter years. There is very wide area: sewage treatment, oilfield and petrochemistry, the crushing of different materials, pharmacological industry, food industry, production of cosmetic, chemical industry and other [1]. We name the processing of different materials by rotating magnetic field as process activating and the area in which the process activating performs as active zone. The some concentration of ferromagnetic materials is used frequently in the active zone. It is named as vortex layer because there is proceeded intensive movement of the magnetic particles in different directions.
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