The “TORNADO” resonance-vortex installation is a gas-dynamic shredder, in which a cascade adiabatic-resonance-shock grinding is implemented at speeds of collisions close to the destruction threshold. The process is designed in such a way so that any particle of the input material gets literally torn by the repeated crossing of the differential pressure zones in the intervortex vacuum chamber, which produces ultrahigh gradient (pressure drops) at the interface (up to hundreds of thousands atmospheres). When the material is injected into such area of pressure differential, a rupture of the material’s structure and clusters occurs. Such mechanism can be compared to the mechanism of material’s sample destruction, which is done in order to determine its strength characteristics at tensile test plants. That is, grinding is made not due to frictional force, etc., mechanics, but arbitrarily "air" and resonances, which gives the highest productivity, the speed of raw material flows and efficiency with low cost and energy costs (no rubbing parts).
The jet mills are not analogous to gas-dynamic vortex mills and have a specific power consumption of about 20-70 kWh / ton of crushed raw material, which is comparable to the analogous indicator (according to the manufacturer's data) of the Tornado-30-75 kWh/t mill at the same ton of grind. But it is necessary to take into account that the costs of 75 kW/h are set in the directories from the capacity of the compressor Keizer (Germany) with the capacity of 11-13 cube/minute at a pressure of 9-11 bar (modes).
If for torsion (jet) grinders the use of compressed air is typical at pressures of 0.7-1.4 MPa, then with the "Tornado” installation, a similar effect is achieved at 0.2-0.6 MPa, which significantly reduces costs and allows obtaining extremely fine powders that can not be obtained with other methods. In addition, due to adiabatic expansion, there is a decrease in the temperature of the working medium in the “Tornado” working chamber, which makes it possible to avoid local heating and thermal destruction of the material that is ground.