MXPA98000531A - Method and apparatus for the separation of bo - Google Patents

Abstract

The arc magnet is made of a series of magnets that produce a magnetic field radially. The arc magnet is supported adjacent to the outer periphery of the blind drum. The blind drum broken. The steel balls and the magnetic material are retained on the inner periphery of the blind drum and brought to the end of the arched magnet. This arched magnet can be formed either of electromagnets or permanent magnets. Another embodiment has one or more magnets attached to the spaced positions around the outer periphery of the drum. Permanent magnets or electromagnets can be used. The electromagnets are connected to sliding rings that energize the magnets from approximately the position corresponding to 6 hours, and de-energize them in the corresponding position at 11 o'clock. The permanent magnets are moved away from the blind drum at approximately the 11 o'clock position. The magnetic material is released from the blind drum when it reaches approximately the 11 o'clock position, and is collected in a tray inside the blind drum. A magnet or a plurality of magnets may be used

Description

METHOD AND DEVICE FOR SEPARATING BALLS DESCRIPTION OF THE INVENTION This application claims the priority benefit of the US provisional application number 60/035953, filed on January 17, 1997. The present invention relates to a method for separating balls from steel and other ferromagnetic materials from a non-ferromagnetic ore when the materials move out of a ball mill or similar device. The invention has utility or application in general in magnetic separators. The problem to which this invention is directed, is that the balls used in a ball mill or similar apparatus are frequently carried out of the mill with the ore. This happens more frequently, as the balls wear out to a size that approximates the size of the mineral sought. These balls that are basically steel can damage the downstream equipment such as pumps when they pass through the system. To prevent this damage, it is desirable to remove the balls from the ore before they leave the mill. A method and apparatus for separating the magnetic part from a mixture of ferromagnetic balls and other ferromagnetic material and non-ferromagnetic minerals is presented, the proposed device realizes this separation by a partial arc of permanent magnets that partially surround a blind drum. The discharge section of the mill includes a drum having holes therethrough of a size that allows pieces of a desired size to pass through them. The magnet causes the steel balls to be held against the inner surface of the blind drum on the lifting side. The balls are brought to an area near the top of the blind drum, where the magnetic arc ends. When the balls emerge from the magnetic influence, they fall from the inner surface of the blind drum and are collected in a tray or funnels. The tray has a channel on one side thereof that directs the balls to a suitable collector point. The method of the apparatus described herein can be used in magnetic separator environments, a magnet having a concave surface having an upwardly facing part, an inwardly facing part, and a part pointing downwardly is used. A rotating non-magnetic transport member is adjacent to the magnet and runs very close to the parts of the magnetic surface. Magnetic and non-magnetic material are placed on the conveyor part that faces upwards. The magnetic portion is kept next to the conveyor by the magnetic field, while it is taken from the part that looks up, to the part that looks inwards, and then to the part that points downwards. When the magnetic portion passes beyond the magnetic influence it will fall on a tray. A gutter can be connected to the tray to take the balls and magnetic material to a collecting area. According to the example of the method presented in the present invention, a separate and graduated mill is provided in which the ore is broken to a desired size of ore, and the ore of the desired size is separated in a rotating drum placed downstream of the mill, to graduate the mineral. A blind drum is provided adjacent to the drum, which can be placed either upstream or downstream of the drum. This graduated can be done before or after the magnetic portion has been removed, the blind drum is a rotating cylinder that has the same diameter as the drum but does not have exits to graduate the ore. Surrounding about half the blind drum is an arc of permanent magnets or electromagnets that partially surround the blind drum. The magnet causes the steel balls and other ferromagnetic material to be brought to the inner surface of the blind drum on the lifting side. The magnetic portion that includes the steel balls is brought to an area near the top of the blind drum where the magnetic arc ends. In this point, the magnetic portion including the balls fall from the inner periphery of the blind drum and are collected in a funnel and directed down a chute to a suitable collector point. From the collector point, the balls can be returned upstream and reused, the remaining portion can be used as appropriate. One or more lifters may be provided in the blind drum, the elevator or lifter may consist of one or more elevated portions on the inner surface to assist in lifting magnetic material to the top of the blind drum. Inside the blind drum below the top, a funnel or non-magnetic tray is located. The gutter can be made of stainless steel to direct the balls and the magnetic portion of the ore to a collector point. According to the apparatus of the present invention, a structure is provided for separating ferromagnetic parts such as steel balls from a non-ferromagnetic ore stream as it leaves, for example, a ball mill or similar structure. The flow can proceed through a drum, where the pieces selected by size are separated. Upstream or downstream of the drum section, a blind drum is provided which provides a rotating surface to collect and lift the balls. An elevator comprises, an raised section attached to the internal periphery of the blind drum and projecting inward therefrom. The upstream side of the elevator can be basically perpendicular to the blind drum. The downstream side of the elevator can be attached to the blind drum at an angle of 45 degrees or less. The arc-shaped magnet for the purpose of lifting and separating steel balls, extends approximately half the way around the blind drum, is supported adjacent to the drum that there rotates. The arc-shaped magnet member can be made of permanent magnets or electromagnets. In another embodiment, two magnet members may be provided in the form of symmetrical arcs one on each side of the blind drum, whereby when the direction of rotation of the mill changes, the balls may be carried upward on the other side and dropped into the tray. Another alternative mode provides a device that will work regardless of which direction the drum is rotated and incorporates a single magnet formed in an arc that is supported and movable in a fixed circular path, where the position of the magnets and the magnet can be improved. it can move to the opposite side periodically, when the direction of mill rotation is reversed. In another embodiment of the invention, electromagnets may be used to replace the permanent magnets described herein.

A blind drum section may have an electromagnet attached to the outer surface thereof so that when the electromagnet receives energy, the ferrous material within the drum section will be attracted to the inner surface of the drum in the vicinity of the electromagnet. When the drum rotates, the electromagnet is energized from about the magnet position of the time of the clock 6, to the magnet position of the clock time 11, at which point it loses energy, causing the ferrous material raised to fall within a collector funnel and gutter, by joining the magnet to the outer surface of the blind drum, at least two advantages are achieved compared to the stationary arc of the magnets. First, fewer magnets can be used, since a continuous magnetic field is not required at the positions of time 6, at time 11, and second, because the magnetic field travels with the surface of the blind drum, it is no longer needed or the need for an internal shaper bar or elevator to keep the ferrous material moving is minimized. One or more electromagnets can be arranged in the periphery of the blind drum, in multiple stations and can be energized and de-energized in sequence when the blind drum rotates. This increases the collecting capacity of ferrous material in the system. A similar device can be arranged with a permanent magnet, so that it can rotate away from the outer surface of the blind drum, by a suitable actuator, mechanical link or balance arrangement, when the magnet reaches approximately the 11 o'clock position when the Magnetic is put on the tray. The balance arrangement causes the magnet to remain in the uncoupled position until the tray has passed, at which point the magnet swings back to engage with the blind surface of the drum. Using a permanent magnet instead of an electromagnet, the initial and operating costs are potentially reduced. A similar object can be used with a number of permanent magnets arranged around the outer periphery of the drum in multiple stations, each magnet will be moved away from the blind drum and in turn to release the magnetic portion in the tray, this will increase the collecting capacity of the drum. Ferrous material of the system. An electromagnet can be attached to the internal surface of the blind drum protected by a suitable box, an advantage of this arrangement, is that the magnet box itself will serve as a scraper bar or riser to eliminate any possibility of loss of ferrous material on the lifting side of the drum, the magnet will attract and retain the ferrous material more efficiently. A similar device using multiple electromagnets around the inner surface of the drum can also be used. A single arc-shaped magnet can be pivoted about a vertical axis and used as a lifting magnet on either side of the blind drum, depending on the direction of rotation of the mill and its periodic inversions. A structure that incorporates a single magnet in the shape of an arc that by an appropriate electrical or mechanical link changes the position of the magnet automatically when the mill changes its direction of rotation. The magnet can be mounted on a rail. The magnet can be adjusted by mounting it along the rail to improve the position of the magnet within a predetermined range. The applicant knows the following US patents: 788,675; 953,092; 1,313,734; 2,269,912; 2,428,228; 2,968,524; 3,086,718; 3,291,398; 3,489,280; 3,684,090; 3,901,795; 4,124,497; 4,441,659; 4,666,591; 5,091,077; and 5,490,928. It is an object of the present invention to provide an improved apparatus and method for separating a magnetic portion from a stream of material having a mixture of magnetic and non-magnetic materials. It is an object of the present invention to provide an improved apparatus and method for separating a magnetic portion from a stream of material passing through a rotating enclosing structure. It is another object of the present invention, provide a magnetic ball separator that is simple in its construction, economical to manufacture and efficient in its use. With the above and other objects in view, the present invention consists in the combination and arrangement of parts that will be described more fully in relation to the attached drawing and indicated particularly in the claims. It is understood that changes can be made in the shape, sizes, proportions and details of the construction, without departing from the spirit of the invention. The features of the invention include; An arc-shaped magnet for lifting and separating steel balls; a central discharge chute that collects and drives away the balls; a blind drum section that provides a lifting surface for collecting and lifting balls; the specific magnetic circuit to improve the holding power and reduce the agitation of the balls; a blind drum with two symmetrical magnets in the shape of an arc to provide periodic investments in the directions and rotations of the mill; a blind drum with a single arc-shaped magnet moving in a fixed circular path to provide periodic adjustments in the direction and rotation of the mill to bring the position of the magnets to an optimum state, which is included in the invention; a blind drum with a single arc-shaped magnet attached to its working structure that moves along an arc to provide periodic inversions in the direction of rotation of the mill and to bring the position of the magnets to an optimum state; a blind drum having a single arc-shaped magnet pivoting about a vertical port to provide periodic inversions in the direction of rotation of the mill; a blind drum that incorporates a single magnet in the form of an arc that includes an electrical mechanical link, so that the position of the magnet changes automatically when the mill changes the direction of rotation; Permanent magnets are replaced by electromagnets by a suitable circuit technology. BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is a side view of a ball mill, drum and blind drum, with arc-shaped magnet according to the invention; FIGURE 2 is a top view of a ball mill of the drum, and of the blind drum with the arc-shaped magnet and the track according to the invention; FIGURE 3 is an end view of the blind drum with the arc-shaped magnet and the track according to the invention; FIGURE 4 is a top view of the blind drum having two arc-shaped magnets according to another embodiment of the invention; FIGURE 5 is an extreme view of another embodiment that includes a magnet and a hydraulic cylinder to place the magnets on either side of the blind drum; FIGURE 6 is an end view of the blind drum and the arc-shaped magnet showing the structure supporting the magnet; FIGURE 7 is a side view of the arc-shaped magnet according to the invention with the structure supporting the magnet; FIGURE 8A is a top view of a section of the magnet assembly; FIGURE 8B is an end view of the section shown in FIG. 8A; FIGURE 8C is a cross-sectional view taken on line 8C-8C of FIG. 8B; FIGURE 9 is a schematic of the magnetic field pattern of the magnet shown in Figs. 7-8C; FIGURE 10 is a continuous end view of a blind drum and a magnet according to the invention now equipped with electromagnet and sliding rings replaced by a permanent magnet; FIGURE 10A is a cross-sectional view of an electromagnet on line 10A-10A of FIG. 10; THE FIGURE HAS, is a blind drum equipped with two electromagnets; FIGURE 11B shows a blind drum equipped with three electromagnets; FIGURE 11C shows a blind drum equipped with four electromagnets; FIGURE 12A shows an electromagnet entering the area where the ferromagnetic material is separated from the mineral stream; FIGURE 12B shows an electromagnet raising ferromagnetic material to the tray; FIGURE 12C shows the de-energized electromagnet and the ferromagnetic material depositing in the tray; FIGURE 12D shows the electromagnet returning to the separation area; FIGURE 13A shows a permanent magnet entering the area where the ferromagnetic material is separated from the flow of the iron ore; FIGURE 13B shows a permanent magnet raising ferromagnetic material to the tray; FIGURE 13C shows the permanent magnet lifted away from the blind drum and the ferromagnetic material deposited on the tray; FIGURE 13D shows the permanent magnet returning to the separation area; FIGURE 14 shows an electromagnet placed inside the blind drum where it acts as both a lifting magnet and a scraping bar. Referring to the drawings, in Figs. 1 and 2, there is shown a ball mill 14, comprising a large cylindrical body arranged in a horizontal position and rotated alternately in the direction of a clock and in the opposite direction. The ore to be reduced is inserted in position 10, through the entrance 11, at the end 12, of the ball mill 14. It contains hard balls 13, usually of steel that turn with ore to break the ore to the desired size, at the outlet end 15, of the ball mill 14, the drum 20, also cylindrical and rotating, is provided. The drum 20, has holes 22, of predetermined size through which the ore of a particular size can pass to separate at position 24, by gravity in a suitable collector 26, from where the ore of the desired size is conducted to its Next, the remaining part of the ore plus any steel ball that has passed outside the ball mill 14, continues its march in the direction 18, the blind drum 30, the blind drum 30, has a size and shape similar to 20, but it is not provided with mineral holes. The blind drum 30 is a cylinder with solid sides and rotates with the drum 20. The blind drum 30 is supported on a portion, and immediately adjacent to its external surface is the arc-shaped magnet 32, which extends basically from the bottom of the blind drum 30, to an adjacent upper position 37, the internal surface of the blind drum 30, may have one or more magnetic lifters 34. These may be provided with a first side 35, attached to the drum 30, generally perpendicularly. A second side 36, attached to the blind drum 30, at a smaller angle of the rectum. When the blind drum 30 rotates, the magnetic portion of the contents will stop against the wall of the drum 30, by the action of the magnetic field 31, of the arc-shaped magnet 32, the magnetic lifter 34, will help lift the magnetic part of the magnet. the portion of ore through the arch upwards to an adjacent upper point 37, of the blind drum 30, where the magnet 32, ends and the material that has been raised comes out of the influence of the magnet and falls from the blind drum 30, the tray 38. The tray 38 has a size sufficient to capture the magnetic material that passes the most from the end 39, from the magnet 32, and falls on the tray 38. The material passes from the tray 38, through the channel 40, and it is collected in a position 41, in a suitable manifold 42, from which the balls 13, are returned to the ball mill 14, to be reused, the non-magnetic rest of a smaller size of the mineral passes the discharge end 44, of the drum 30, and goes to the position 45, from a suitable collector 46, and from there the ore is returned by a suitable means to the ball mill 14, for further processing. As shown in Figs. 4 and 5, two magnets 32, 33, identical in the form of an arc can be supported on opposite sides of the blind drum 30, which extends generally from the bottom to the top, the magnets 32, 33, can be provided for lifting magnetic material from the bottom of the blind drum 30, and dropping it into the tray 38, adjacent to the upper part 37, of the drum 30, depending on whether the rotation of the drum 30, is in the sense of a clock or the opposite. Fig. 5 shows two arc-shaped magnets 32, 33, supported adjacent to the blind drum 30, the magnets 32, 33, have arched driving means 52, 53, to move away from the drum 30. The driving means 52, 53, can be hydraulic, pneumatic or other suitable means for moving the magnets 32, 33, from a first position 32, 33, to a second position 32", 33". The magnetic member 80, has a flow field template as shown in Fig. 9, the member 80, is formed of magnets 84. Each magnet 84, is made of a first magnet 61, a second magnet 62, and a third magnet 63, between the first 61, and the second 62, the first magnet 61, the second 62, and the third 63, have a first north pole N, and a second south S, the magnetic members 61, 62, 63, They can be made of plates of ceramic magnetic material.

The magnetic members 61, 62, each have a first lateral end adjacent to a side of the third magnet 63, the field template of the magnetic member is shown in Fig. 9, with the field having a toroidal shape extending through of the nonmagnetic wall of the blind drum 30, and covers the magnetic material that includes the magnetic balls 13, which are in the lower part of the drum 30. The balls 13, are stopped by the magnetic field, ahuse as are other materials magnetic particles against the inner surface of the drum 30, and the magnetic material is pulled with the rotation of the blind drum 30, to the upper end 39, of the magnetic member 32, leaving the magnetic field. When the magnetic material and the balls are outside the magnetic field, they are released and fall on the tray 38, from where they are taken to the collecting area 42, by the channel 40. The arched magnet 32, is made of magnetic members 80, each member 80, has a first end 82, another second 83, and a member 81, each magnetic member 80, has a first magnet 81, and a second lateral magnet 82, the third magnetic member 83, is disposed between the first lateral magnet 61, and the second magnetic member 62. The first end of the first lateral magnetic member 61 is disposed adjacent the third member 63, and the first end of the second member 62 is disposed adjacent the third magnetic member 63. Fig. 6 presents the structure 50, which will support the magnet 32, in a first position to operate when the blind drum 30, rotates in the clockwise direction. The structure 50 supports the magnet 32, on the track means 51, which will allow the magnet to move to a second magnetic position marked with dotted line to be used when the blind drum 30, rotates against a clock, the magnet 32, can also be moved along the track 51, to adjust and improve the position of the magnet 32, within a predetermined range. Fig. 10 shows a blind drum section attached to the external surface of what is an electromagnet, arranged so that when the electromagnet is energized, the ferrous material within the drum section is attracted to the inner surface of the drum in the proximity of the electromagnet. When the blind drum rotates, the electromagnet is energized from approximately the position corresponding to 6 hours, to the position corresponding to 11 hours, at which point it loses energy, causing the lifted ferrous material to fall into a funnel and gutter collectors. By joining the magnet to the surface of the drum, two advantages are achieved compared to the stationary arc of magnets discussed previously: (a) fewer magnets are used, since an absolutely continuous magnetic field is not needed in the blind drum positions of the magnets. 6 at 11 o'clock; and (b) because the magnetic field travels with the blind drum surface is also brought to a minimum or the need for an internal scraping bar to maintain the movement of the ferrous material is eliminated. Fig. 10 shows a cross section of the electromagnet. Figs. 11A-11C, show a device similar to Fig. 10, with the exception that multiple electromagnets are used, arranged around the periphery of the blind drum in multiple stations and that receive energy and lose it in sequence, as it rotates the blind drum. This structure will increase the ferrous collector capacity of the system. Figs. 12A-D, show the sequence of events during the taking of the ball, in Fig. 12A, the electromagnet 132, the balls 113, at the bottom of the blind drum 130, are approaching, to take the balls 113, in Fig. 12B, the electromagnet 132, has taken a number of balls 113, and is lifting them to the side of the drum 130, in Fig. 12C, the electromagnet 132, has no energy and the balls 113, fall into the tray 138. In 12D, the electromagnet 132, is descending towards the bottom of the drum 130, and I will be reenergized to take more balls 113, when the next rotation of the blind drum 130 begins.

As shown in Figs. 13A-D, a device similar to Fig. 12 can be used, except that a permanent magnet, arranged so that it can be rotated away from the outer surface of the drum by a suitable actuator, can be used. in a mechanical link or a balance arrangement when the magnet reaches approximately the 11 o'clock position, as shown in Fig. 13C. This rotation moves the magnet at a sufficient distance from the steel balls, so that they can fall on the tray 38. The balance arrangement causes the magnet to remain in the "decoupled" position, at which point it oscillates back to engage with the surface of the drum. Using a permanent magnet rather than an electromagnet reduces the initial and functional costs compared to the structure of Fig. 12. On the other hand, the system shares the advantages of Fig. 12, with a small disadvantage of a magnetic intensity. reduced (permanent against electric). In another embodiment similar to Fig. 13, with a permanent magnet but using multiple magnets arranged on the periphery of the drum in multiple stations as shown in Figs. HA, B and C, replacing permanent magnets by electromagnets, this will increase the ferrous collecting capacity of the system compared to the system illustrated in Fig. 12.

In another embodiment shown in Fig. 14, an electromagnet is attached to the inner surface of the blind drum, the electromagnet is protected by a suitable box. An advantage of this arrangement is that the box itself will serve as a bar or lifter to eliminate any possibility of loss of ferrous material on the side by which it rises from the drum. Also by virtue of this location on the inner side of the drum, the magnet will attract and stop the ferrous material more efficiently. A device similar to Fig. 12, with the exception that multiple electromagnets are used arranged around the inner surface of the drum. This adds capacity to the device of Fig. 12. Another advantage of the device of Fig. 12 is that they are easily configurable to adapt to any direction of drum rotation. Referring now to the embodiment of the invention, shown in Figs. 12-16, the blind drum section 130, is shown similar to the drum section 30, of Figs. 1, 2 and 3. The blind drum section 30 is generally cylindrical in cross section and has an inner and outer periphery. The tray or upper track 138, is supported under the blind drum and extends approximately from the position of 11 to the position of 1, the electromagnet is fixed to the periphery of the section 130, when the electromagnet 132 is energized, it produces a magnetic field that extends through the non-magnetic drum body and attracts ferrous material by stopping it at the inner periphery of the drum 130. Electric power is supplied to the electromagnet 132, by means of the springs 140, 141, which are known in the art. of the electric generators. The power lines 142, 143 are connected to electric brushes which make contact with the slip rings 140, 141. The rings 141 are not conductive so that no energy will arrive to the electromagnet when the contact part 143 of the brush makes contact with the line of force. Figs. 12A to 12D, show the sequence of the operation of the electromagnets 132, when the blind drum 130 rotates. The electromagnet 132, is approximately in the 5 o'clock position, when the drum rotates the magnetic field of the magnet 132, attracts the balls 111, and moves part of them to the 8-hour position shown in Fig. 12B.

When continuing its rotation, the blind drum leads to the magnet 132, at the 11 o'clock position, shown in Fig. 12C, the wiper blade moves on the conductive zone 143, of the ring 141, leaving the electromagnet without power and falling steel balls 111, on the tray 138. When the drum 130, continues to rotate, electromagnet 132, passes through the 2 hour position, shown in Fig. 12D, and descends to the position shown in Fig. 12A, to attract more balls 111, and lift them to tray 138. Figs.11A-11C, show multiple electromagnets 132, in the drum 130, used to lift the balls 111, and bring them to the tray 138, a separate ring arrangement is required for each of the electromagnets 132.

Claims (24)

1. RE I VIMD I CACI ONE S 1.- An arc-shaped magnet for lifting and separating steel balls from a mixture of ferromagnetic and non-ferromagnetic material characterized in that it comprises: an arc-shaped magnet having a first end and a second extreme; an intermediate part between the first end and the second end; a non-magnetic work support member supporting the member in the form of an adjacent arch; means for a magnetic field from the arc-shaped magnetic member extending through non-magnetic work support member; means for moving the work support member to the immediate vicinity of the magnet in the form of an arc, whereby the magnetic material on the work support member is attracted to the working support seeding by the magnetic field and the magnetic material is it moves with the work support member to the second end part of the magnet and leaves the sagnetic field of the magnet in the form of an arc, whereupon the magnetic material falls to a tray or track below that end of the magnet.
2. 2. Magnet according to claim 1, wherein a channel ñ & Central discharge is connected to the tray and the magnetic material from the magnet is transported from the tray and through the gutter to a collecting area.
3. 3. Magnet according to claim 1, wherein the work support member comprises a basically cylindrical section.
4. 4. A magnetic member comprising a first magnet a second magnet; a third magnet, between the first magnet and the second magnet, each magnet has a first side, a second side, a first end and a second end; a first magnetic pole on one end of the first magnet; a second magnetic pole on the second end of each magnet; a first pole on the first magnet and a second pole on the second magnet are arranged adjacent to the side of the third magnet, whereby a magnetic field path is provided from the first end of the first magnet to the side of the third magnet to the first side of the first magnet. first magnet and the second side of the first magnet, offering a flow field template radially.
5. 5. The magnet according to claim 4, wherein the plurality of magnet or magnetic members are arranged in an end-to-end relationship with each other to form an arcuate magnetic member.
6. 6. A separator comprising a blind drum attached to a drum for removing ferromagnetic material from a mixture of ferromagnetic and non-ferromagnetic materials when the drum rotates; an arc-shaped magnet positioned adjacent and around the outer surface of the blind drum and extending substantially from a point adjacent the bottom of the blind drum, to a point adjacent to the top of the blind drum; a tray supported by the inner side of the blind drum, below the upper part thereof in a position suitable for receiving ferromagnetic materials when they pass the end of the magnet in the form of an arc.
7. 7. The separator according to claim 6, further comprising an elevator attached to and extending through the inner surface of the blind drum and up therefrom.
8. 8. The separator according to claim 6, further comprising a chute extending from the tray to a predetermined collection point.
9. 9.- The separator according to the claim 6, further comprising a second magnet in the form of an arc supported adjacent to the blind drum on the opposite side of the first magnet of the blind drum; the second magnet serves to capture and elevate ferromagnetic material when the direction of rotation of the blind drum is inverted.
10. 10. The separator according to claim 6, further comprising track means extending around the blind drum and supporting the magnet adjacent to the blind drum in a first predetermined position for rotating in a first direction, and in a second position to rotate in a second direction.
11. 11. Separator according to claim 10, which further comprises adjustment means for supporting and improving the position of the magnet within a predetermined range.
12. 12. The separator according to claim 6, further comprising a working structure that extends around the blind drum and supports the magnet adjacent to the blind drum in a first predetermined position to rotate in a first direction, in a second position for rotate in a second direction.
13. 13. The separator according to claim 6, further comprising adjustment means for supporting and improving the position of the magnet within a predetermined range.
14. 14.- The separator according to the claim 6, which further provides pivotal means supporting the arch magnet adjacent to the blind drum at a first predetermined position to rotate in a first direction; pivotal means rotating the magnet to a second predetermined position so that it rotates in a second direction.
15. 15. The separator according to claim 14, further comprising adjustment means for supporting and improving the position of the magnet within a predetermined range.
16. 16. The separator according to claim 6, wherein the arc-shaped magnet comprises permanent magnets.
17. 17.- The separator according to the claim 6, wherein the arc-shaped magnet comprises electromagnets.
18. 18. A separator comprising a cylinder for removing ferromagnetic material from a mixture of ferromagnetic and non-ferromagnetic materials, while rotating the cylinder; an electromagnet attached to the outer surface of the cylinder; the electromagnet is energized when the position of the magnet is near the bottom of the cylinder to attract and retain ferrous material on the inner side of the cylinder when it is broken; the electromagnet loses energy when the position of the magnet is close to the top of the cylinder; a tray is provided to collect the ferrous material when it is released.
19. 19. The separator according to claim 18, comprising more than one electromagnet; The electromagnets are spaced apart from one another at the periphery of the cylinder.
20. 20. The separator according to claim 18, wherein the electromagnet is attached to the inner surface of the cylinder.
21. 21. The separator according to claim 20, wherein the multiple electromagnets are spaced from one another at the periphery of the inner surface of the cylinder.
22. 22. A separator comprising a cylinder for removing ferromagnetic materials from a mixture of ferromagnetic and non-ferromagnetic materials, while the cylinder rotates; a permanent magnet attached to the outer surface of the cylinder and movable from a first position against the cylinder to a second position removed from the cylinder; the permanent magnet is in the first position when the position of the magnet is near the bottom of the cylinder to attract and retain ferrous material inside the cylinder when it rotates; the permanent magnet is moved to the second position when the position of the magnet is close to the top of the cylinder; a tray is provided to collect the ferrous material when it is released; the permanent magnet returns to the first position before the position of the magnet reaches the bottom of the cylinder.
23. 23.- The separator according to the claim 22, characterized in that it comprises more than one permanent magnet; the permanent magnets are spaced at the periphery of the cylinder.
24. 24.- A method to separate ferromagnetic materials from a mixture of ferromagnetic and non-ferromagnetic materials by rotating a blind drum; characterized in that: a mixture of ferromagnetic and non-magnetic material is passed through the blind drum; magnetically the ferromagnetic material is fixed to the blind drum; the ferromagnetic material rises a predetermined distance; the material is released; and the material is collected in a suitable place. RE SUME N The arc magnet is made of a series of magnets that produce a magnetic field radially. The arcuate magnet is supported adjacent to the outer periphery of the blind drum. The blind drum broken. The steel balls and the magnetic material are retained at the inner periphery of the blind drum and brought with it to the end of the arched magnet. This arched magnet can be formed either of electromagnets or permanent magnets. Another embodiment has one or more magnets attached to the spaced positions around the outer periphery of the drum. Permanent magnets or electromagnets can be used. The electromagnets are connected to sliding rings that energize the magnets from approximately the position corresponding to 6 hours, and de-energize them in the corresponding position at 11 o'clock. The permanent magnets are moved away from the blind drum at approximately the 11 o'clock position. The magnetic material is released from the blind drum when it reaches approximately the 11 o'clock position, and is collected in a tray inside the blind drum. A magnet or a plurality of magnets can be used.