Patent GB-1054807-A (GB)
IPC: B03C1/03
Abstract: 1,054,807. Magnetic separators. G. H. JONES. July 19, 1963 [July 25, 1962; Aug. 1, 1962]. No. 28525/62 and 29497/62. Heading B2J. Liquid or gas borne magnetic particles are attracted by the induced magnetism of ferrons material passing between magnetic poles, the material passing through the field to a station where it is rinsed to dislodge entrained non- magnetic particles and passing further and out of the field to a station where it is scoured to dislodge the adhering magnetic particles. As seen in Figs. 1 and 3 a concentric array of ferrons or ferrons containing cylinders 1 and 2 are mounted on a spider 6 with a central pole piece 3 for rotation on a shaft 4. Surrounding the rotatable assembly is an armature 11 with six electromagnetic poles 12. The liquid borne particles are released to flow between the walls of cylinders 1 and 2 from each of six funnels 27 mounted above the rotating assembly between the poles 12 and the central pole piece 3. Waste liquid passes between the cylinders 1 and 2 and falls into a gutter 18 with a drain 22 beneath each funnel 27. Magnetic particles adhering to the rotating cylinders are transported to a station where they are rinsed in liquid from a funnel 28 to dislodge entrained non-magnetic particles, the liquid and dislodged particles being collected in a gutter 17 with a drain 21. The magnetic material adhering to the cylinders is transported out of the field between the pole pieces 12 and is subjected to the scouring action of liquid jets to collect the magnetic material in a gutter 16 with a drain 20. Since the direction of the magnetic field alternates between the pole pieces 12 the induced magnetism of the cylinders 1 and 2 passes through a null point and consequently facilitates release of the adhering particles. When cleaned of adhering particles the cylinder walls are advanced into the field between the next pole piece 12 and pole piece 3 where liquid borne particles are being introduced from another funnel 27. The cylinders may have grooves to provide areas of concentrated flux and may be wedge-shaped to offer a larger aperture on the upper side. At one point beneath the cylinders an upwardly directed air blast may be employed to eject large particles trapped between or on top of the cylinders. In place of cylinders 1 and 2 a rotating annular member 56, 57, Fig. 13, may be employed, the member containing nests of ferromagnetic plates between which the liquid suspension is sluiced. With this arrangement it is possible to apply the scouring and air blast jets by means of injectors which engage the top or bottom of the annular member with a seal to prevent leakage from the sides. Such injectors may be mounted so as to move with the continuously rotating annular member 56, 57, for so long as injection takes place, the injector being drawn back in preparation for the next injection. Alternatively the member 56, 57, may be driven intermittently between injections made from fixed positions. The plates in each nest may have saw-toothed corrugated surfaces to provide lines of high flux density. If the central pole piece 3 is stationary, permanent magnets may be employed on each side of the rotating annulus (Figs. 3, and 4, not shown).