I. The structure and working principle of BT electromagnetic separator:
The structure of BT vertical ring pulsating high gradient magnetic separator is as shown in Fig. 1. It mainly consists of pulsating mechanism, exciting coil, yoke, rotary ring and various hoppers and buckets. Steel mesh or rod made of permeable stainless steel is used as magnetic medium.
The excitation coil generates an inductive magnetic field in the sorting area through direct current, a non-uniform magnetic field, i.e. a high gradient magnetic field, is generated on the surface of the magnetic medium located in the sorting area. The rotating ring rotates clockwise, and the magnetic medium is continuously fed into and out of the sorting area. The pulp is fed into the hopper and flows through the turning ring along the gap of the upper yoke.
The magnetic particles in the pulp are adsorbed on the surface of the magnetic rod, rotated to the top of the non-magnetic field area swivel by the, washed into the concentrate bucket by the flushing water. The non-magnetic particles pass through the magnetic medium file under the action of gravity and pulsating fluid force, and are separated from the magnetic particles. Then it flows into the tailings bucket along the gap of the lower yoke and be discharged.
For each group of magnetic media, the direction of flushing magnetic concentrate is opposite to the direction of feeding ore. Coarse particles can be flushed out without passing through the magnetic media file. The impulse mechanism of the machine drives the pulp to produce pulsation, which can keep the mineral particles loose in the magnetic medium pile of the separation area, make the magnetic mineral particles easier to be captured, and make the non-magnetic mineral particles enter the tailings through the magnetic medium pile as soon as possible.
Obviously, the back flush concentrate and pulp pulsation can prevent the blockage of magnetic medium, and the pulsation separation can improve the quality of magnetic concentrate. These measures ensure that the machine has higher enrichment ratio, higher separation efficiency and stronger adaptability.