A HIGH-FREQUENCY SEPARATING DEVICE TO SEPARATE LIGHT COARSE PARTICLES FROM HEAVIER COARSE PARTICLE

摘要

The present invention relates to a simple equipment provided with a hopper and a vibratory feeder. The vibratory feeder will have a facility to control the frequency of vibration in the range of 10-80 Hertz. It will also have an online facility to measure the operation frequency of the vibrator. Method A feed consisting of a mixture of coarser lights (size 6 mm to 10 mm, density 2.6) finer heavies size 1 mm to 4 mm density 4.4 coarser heavies (size 6 mm to 10 mm density 4.6) and fine lights of site 1 mm to 4 mm density 2.6 will be fed to the hopper and then the frequency of vibration will be tuned so that the applied frequency matches with the normal frequency of the coarser lights. This process will cause resonance of the coarser lights which then moves up while traveling along the chute of the vibrator, Figure 2A and 2B shows mixed status of the particles in the feeding end and segregated particles at the discharge end of the chute. A cutter placed at the discharge end of the chute finally divides the segregated layer into two products. Each of the products can be further beneficiated by passing it again over the high-frequency separator. Principle This process of separation is based on a well known concept which is known as Tune Mass Damper (TMD) concept. It defines natural frequency of each particle in a particulate assemblage as Where, k is spring constant and m is the mass of the particle. Spring constant for the coarser particles will be higher. Thus coarser lights and smaller heavies with same mass will have different natural frequency range. This is schematically explained in Figure 3. In case applied frequency matches with the natural frequency of coarse light; the fraction gets segregated at the top of the bed on vibration.