Abstract
To decrease the separation density of a dense-medium cyclone by using an online control method, a coaxial coil was placed outside the lower cone position of the dense-medium cyclone, and a separation test of coal with a size of 0–3 mm was performed in a coaxial magnetic field. Subsequently, the density composition of the separation products was determined through a float-and-sink analysis. Further, the magnetic force of the dense-medium particles in a magnetic field generated by the coil was analyzed through the Ansoft software. The results showed that dense-medium particles were attracted into the underflow by the downward axial magnetic field force. Therefore, the separation density of the dense-medium cyclone can be decreased in the magnetic field created by the coil with large passing currents (i.e. 12.5–20 A). Hence, this study may provide a new method to control the separation density of dense-medium cyclones, which has a considerable significance to improve the automation of coal preparation plants.
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