US832821A - Magnetic ore-separator. - Google Patents

Description

PATENTED OCT. 9, 1906. H. H. WAIT & F. T. SNYDER.

MAGNETIC ORE SEPARATOR. APPLICATION FILED MAR. 9, 1905.

UNITED STATES PATENT OFFICE.

HENRY H. WAIT, OF CHICAGO, AND FREDERICK T. SNYDER, OF OAK PARK, ILLINOIS, ASSIGNORS TO INTERNATIONAL SEPARATOR COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

MAGNETIC ORE-SEPARATOR- Specification of Letters Patent.

Patented Oct. 9, 1906.

To all whom it may concern.-

Be it known that we, HENRY H. WAIT, residing at Chicago,-and FREDERIOKT. SNY- DER, residing at Oak Park, in the county of Cook and State of Illinois, citizens of the United States, have invented a certain new and useful Improvement in Magnetic Ore- Separators, of which the following is a full, clear, concise, and exact description.

Our invention relates to a magnetic oreseparator; and its object is to provide a simple and efficient machine by which materials having only slight difference in magnetic permeability can be separated with rapidity and certainty.

In general, the machine is of the class in which the material to be separated is fed upon the top of an endless conveyer-belt, which carries it onward and at-the turn the belt discharges the material into suitable collecting-boXes.

In accordance with our invention the magnetic separation is made during the travel of the material from one end of the belt to the other. having a magnet arranged to move over the surface of the belt at an angle to the direction of travel thereof, said magnet having means for causing dispersions of the magnetic flux from lines, points, or narrow areas at the magnet-surface. Magnetic particles in the mixture of material upon the belt will be attracted to the surface of the moving magnet along the converging lines of force, and as the' magnet moves they will be diverted from the path of the remainder of the material which is carried onward by the belt.

A convenient construction is to provide a cylindrical armature or separating carrier arranged to rotatebetween two magnet-poles, one above andon'e below it, the belt passing through the gap between the armature-and the lower pole-piece. The rotating armature is arranged at an angle to the belt, so that material picked up from the surface of the belt will in the rotation of the armature be carried sidewise and finally dro' ped again upon the belt at a point latera ly distant from the point where it was picked up.

We will describe our invention more particularly by reference to the accompanying drawings, and the parts, improvements, or

veyer turns over the end roller.

This can be efficiently performed by combinations which we regard as novel will be pointed out in the a pended claims.

Figure 1- is a sectiona plan view of the machine. Fig. 2 is a side elevation thereof, partially in section; and Fig. 3 is a sectional elevation on line 3 3 of Fig. 1. i

The same letters of reference designate the same parts wherever they are shown.

The endless belt or carrier a is arranged to rotate over rollers a a, one of which may be driven to cause the conveyer to travel in the direction of the arrow in Fig. 1. The material to be separated is fed onto the belt through a feed-h0pper 6 (shown at the left in Fig. 1) and in the travel of the conveyer' is carried toward the right and finally discharged at the right-hand end as the con- Boxes 0 d are provided for collecting the material at the end of the conveyer, said material having been separated during its passage, as will be hereinafter be described.

The upper lap of the conveyer-belt a, which receives material to be separated, is arranged to travel in the air-gap of a magnetic circuit between a revolving armature or separating-carrier e and a magnet pole-piece S, the face of which is close to the under side of the upper lap of the conveyer. Preferably the armature e is arranged to rotate between opposed pole-pieces N and S of a field-magnet m, the frame of which is in an open-box form, the armature-shaft being journaled at neutral points in the sides of the magnet-frame. The armature or separating carrier 6 is pro vided with means for causing dispersions or divergences of the magnetic flux from points, lines, or narrow areas on its surface for the purpose of attracting the magnetic particles of material on the conveyer toward the armature-surface rather than downward toward the stationary magnet-pole. Preferably the armature is laminated, as shown, being formed of circular disks assembled upon a shaft. The edges of the disks are serrated or toothed, and the disks are preferably assembled in relative positions to present the teeth in staggered rows upon the surface'of the armature thus built up. This laminated construction of the armature is advantageous, not only because eddy-currents are reduced and the armature is permitted to turn in the I again on the conveyer belt theonwardmove intense magnetic field with a minimum expenditure of energy, but also because the aminated construction lends itself to the formation of a toothed surface, as above described. The lines of force also tend to di verge from theedge of the individuallaminations. The location of the armature between opposed pole-pieces of opposite polarity is also advantageous, in that the magnetic pull upon: the armature is approximately balanced, or, if desired, the magnetic pull from the upper pole can be so proportioned as to exert a magnetic pull upon the armature sufficient to balance theweight of thearmature in' addition to the magnetic pull of the lowerpole. A neutral point is also established u pon the surface of the armature between the two poles, at which point the attracted" material will be released. If desired, however, means can be provided for positively removing the attracted material as it is carried upward around the side of the armature; Rotating brushes fora similar purpose are well known in the art.

The armature'is-disposed, as shown, at an angle to the direction of" movement of the conveyer belt,andits rotation is suchthat attracted material will be carried backward diagonally across theconveyer,.so that when such attracted material is released and falls ment off the latter will bring" such material again" under' the armature at a point farther albng'toward its end. A zigzag-progression of the magnetic material is thus caused toward the end of the rotating armature until finally the attracted material when released is carried by the-conveyer away from the end of'thearmature-and on toward the right, as shown in Fig. 1 The-magneticconcentrate is thus finally discharged in the box (Z at the end of'the conveyer, near one side thereof, while the non magnetic material is carried straight on and discharged into the other box' a opposite the point where it is fed on, the non-magnetic material being unaffected by themagnet. The double motion of the magnetic material backward and across the conveyor as produced by therotating cylind'er has theelfect of thoroughly cleansmgthe magnetic material fromthe non-magnetic tailings, so that avery clean magnetic con centrateis thus produced; The repeated magneticaction effectually prevents any entrained non-magnetic particles from remain ing' in with the magnetic product.

In thepreferred form of the invention the armature cylinder' is most strongly magnetized at the endwhere theore'first reaches it and less strongly magnetized at the other end, where theattracted material is finally released. L4 This shading in-the magnetism of the armature can be accomplished by increasing the air-gap between the lower polepiece and the surface of the armature toward the end at which the ore is finally discharged.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent 1. In a magnetic separator, the combination with a horizontal rotating magnetic cylinder having permeable projections at its periphery, of a magnet-pole under said cylinder, and a conveyer passing obliquely across the air-gap between said pole and said cylinder, whereby magnetic material fed upon said conveyer is diverted, substantially as set forth.

2. In a magnetic separator, the combina tion with a laminated rotating cylinder havingpermeable projections at itsperiphery, of opposing magnet-poles of" opposite polarity between which said armature is adapted to rotate, a conveyer arranged topass obliquely across the air-gap between said cylinder and one-of said poles, andmeans for'r'otating said cylinder in the direction to carry its lower surface diagonally backward across" said conveyer, whereby magnetic material on the conveyer i subjected to repeated magnetic separating action, as described. k

3. Ina magnetic separator, the combinationwith' a' conveyer-belt, of a magnetic cylinder arranged to revolve above said belt, said cylinder being obliquely disposed with reference to the motion of said belt, means for magnetizing said cylinderwitli increasing strength in the direction of its axis, and means for feeding material tobe separated onto said belt inline'with the more strongly magnetized portion of the cylinder;

4. In a magnetic separator, the combina-- tion' with a horizontal, transversely-laminated rotating armature having permeable projections at its periphery, of magnet-poles of oppositepolarity' above and below said an mature, an endless conveyer-belt passing obliquely across the air gap between said armatureandthe'lowerpole piece, means for'feed' ing material to'be separated" tosaid'belt near one side thereof, means for moving said belt to carry such material past said armature, and means forrotating said armature-in a direction to move the permeable projections backward across the conveyer belt.

In witness whereof" We hereunto 1 subscribe our names this 10th day ofOCtober, A. DE 1904-.

HENRY I-I..WA-I TL FREDERICK T. SNYDER.

Witnesses v IRvINe MAO DONALD, D'E Wrr'r G. TANNER;

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