GB1051794A - - Google Patents

Abstract

1,051,794. Magnetic separators. ERIEZ MANUFACTURING CO. Jan. 29, 1965, No. 4017/65. Heading B2J [Also in Division H1] In a magnetic drum-type separator having a shell made of non-magnetizable material rotatably mounted on a stationary shaft, a number of pole assemblies 110-113, Fig. 3, are secured inside the shell to a back plate 102 of magnetic material fixed to the shaft 105 and extend radially outwardly to the vicinity of the inner periphery of the shell. Each pole assembly comprises one or more stacks, e.g. 121, 122, of magnetic units 125 each of which has a greater dimension in length and width than in thickness. In the or each stack the units are arranged with their major faces in abutting relationship. The units in each assembly are magnetized permanently in the same direction. which direction is substantially normal to the major faces of the units. As shown, the back plate 102, which may be of steel, has welded thereon upstanding projections 102a which are detachably secured to support plates 104 axially spaced along the shaft and provided with hubs 106, 107 for the passage of the shaft. The pole assemblies are of alternate polarity. The units 125, which may be of a non-metallic material comprising a magnetized ceramic, e.g. barium ferrite, are held together on flat portions 130, 131 of the back plate 102 by means of plates 135-138 of non-magnetizable material and threaded bolts 140. Non-magnetizable holding plates 141, 142 may be provided on the endmost faces of the pole assemblies 110, 113. In a modification, Fig. 4 (not shown), the magnetic units 125 are held by means of channelshaped covers 150 of stainless steel bolted to the backplate 149. In the arrangement of Fig. 1 the drum 11 is driven counter-clockwise by means of an electric motor 18 through a chain 17 and a sprocket 15 and is spaced from a plate 41 defining a chamber 40 to which is fed. through an opening 39, in the plate 41, a slurry of material 35 to be separated. The material is delivered to a chamber 36 to which water is fed at 37 to form the slurry. Non-magnetic constituents 52 of the material are discharged, via an opening 50 in the plate 41, into a chamber 51 and are removed at 54. The magnetic constituents are attracted to the outer surface of the shell-and are carried thereby past the pole 29 of the permanent magnet 20 to fall off, or to be scraped off, into a chute 55. A baffle plate 45 defines an overflow chamber 46 for excess water which is removed at 48. Fig. 2 (not shown) relates to a slightly different arrangement in which the separator drum is rotated clockwise. Separators for dry separation may be similarly constructed.