High-gradient roll-type separators are applied for dry magnetic separation of non-metallic materials and feebly magnetic ores.
From the separator’s receiving bunker, the material comes to the vibration feeder, from where it is uniformly supplied to a belt conveyor with a magnetic drive shaft. Under the effect of a magnetic field created by the shaft, magneto-susceptible inclusions, located in the flow of material to be separated, are gravitated to the shaft and are held on the surface of a Kevlar belt enveloping it and transferring inclusions into the dumping area. A plate splitter to be installed under the magnetic shaft is used for separating the flow of non-magnetic material component from the flow of inclusions with a low magnetic susceptibility, changing the motion trajectory under the effect of a powerful magnetic field.
Research and Production Company “ERGA” produces SMVI-1, -2, -3 series roll-type magnetic separators, intended for the one- and two-stage separation and equipped with one or two magnetic rolls accordingly. The dry magnetic separation technology with the preliminary removal of a strong-magnetic material component via drum (SMBM series) or rod magnetic separators (ASMK series), with the subsequent release of a feebly magnetic component via SMVI-2 series roll-type separators, became the most wide-spread.
For the removal of a strong-magnetic material component before its supply to SMVI-1, -2, -3 series roll-type separators, it is recommended to use SMBM-series drum magnetic separators.