Separation in the aerodynamic dispergator
When dispergator is working, material is moved to dispergator through special loading gate and gets to rotor with blades. Material collides with blades and grinds, under inertial forces material particles tend to leave dispersion area. At the same time fan blows down air through dispergator in order to return material particles to grinding area, so, the generation of air-fluidized material bed at outer radius of horn rotation is executed. Particles traverse speed in air-fluidized bed is lower, than rotor traverse speed, that executes energy, which is necessary for material grinding. Material drying is executed owing to intensive air change. Air flow, providing drying of material, is up to 30 000 m3/hour, the flow rate is 25-28 meters/second relative to material particles, which are in a fluidized bed. Effective drying is executed when the air of temperature is 120 - 150 ° C, the approximate rate of thermal energy is 750-800 kW. to 1 tonne evaporated moisture. Grinding and drying of material is executed until material particles reach necessary size and humidity.
Radial separation is an ejection of ready grinded and dryable material, which is executed from apparatus centre under forces, made by intensive air flow, coarse particles as a result of inertial forces dominance rest in grinding area and fine and dry particles are taken away. Radial separation is more delicate, it allows to separate ( take away from grinding and drying area) especially fine particles of uniform granulometric structure.
Inertial separation. Forces, which effect inertial separation, are regulated delicately with the help of changing of rotor rotational speed and volume of processing air. You can adjust the equipment to take away particles of necessary characteristic of one material tangentially from grinding zone to bin, which is situated at the bottom of equipment; and to select particles of other material of other characteristic radially.