US3856666A - Magnetic separator - Google Patents

Magnetic separator Download PDF

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Publication number
US3856666A
US3856666A US00273580A US27358072A US3856666A US 3856666 A US3856666 A US 3856666A US 00273580 A US00273580 A US 00273580A US 27358072 A US27358072 A US 27358072A US 3856666 A US3856666 A US 3856666A
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Prior art keywords
rotary drum
group
induced poles
drum
magnetic
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US00273580A
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English (en)
Inventor
S Yashima
H Manabe
T Ito
K Namikawa
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SABURO YASHIMA AND NIPPON MINI
SABURO YASHIMA AND NIPPON MINING CO Ltd JA
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SABURO YASHIMA AND NIPPON MINI
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Priority claimed from JP46053565A external-priority patent/JPS5038221B1/ja
Priority claimed from JP46053566A external-priority patent/JPS5123924B1/ja
Priority claimed from JP5603171A external-priority patent/JPS5520747B1/ja
Priority claimed from JP47004986A external-priority patent/JPS511857B2/ja
Application filed by SABURO YASHIMA AND NIPPON MINI filed Critical SABURO YASHIMA AND NIPPON MINI
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B03C1/029—High gradient magnetic separators with circulating matrix or matrix elements
    • B03C1/03—High gradient magnetic separators with circulating matrix or matrix elements rotating, e.g. of the carousel type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • B03C1/14—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with non-movable magnets

Definitions

  • ABSTRACT A wet type magnetic separator has a generally cylindrical stationary magnet device with its axis fixed and extending substantially horizontally with a cutaway recess open from the top of the cylindrical body and to one side along its periphery.
  • a rotary drum is disposed coaxially and rotatably to the stationary magnet device and adjacent about the stationary magnet device, and is covered with substances of high magnetic permeability functioning as a group of induced poles.
  • the magnetic separator can separate magnetic particles by means of magnetic force from non-magnetic particles of the raw materials, which are supplied to the top of the rotary drum.
  • This invention relates to a magnetic separator and, more particularly to a wet type magnetic separator for separating magnetic particles from raw ore materials.
  • a system which includes members having such configuration as a ball or a rod made of a substance of high magnetic permeability and low resid ual magnetization (hereinafter represented as a group of induced poles), such as soft iron, disposed in a mag netic field created by a high intensity electromagnet (which is generally in excess of 20,000 gauss), and performs magnetic separation while supplying particles to be separated into the magnetic field formed in the space between these members.
  • members having such configuration as a ball or a rod made of a substance of high magnetic permeability and low resid ual magnetization (hereinafter represented as a group of induced poles), such as soft iron, disposed in a mag netic field created by a high intensity electromagnet (which is generally in excess of 20,000 gauss), and performs magnetic separation while supplying particles to be separated into the magnetic field formed in the space between these members.
  • magnetic separators have been known prior to the present invention, typical ones of which are shown in FIGS. 12 and 13 of the attached drawings, have the drawbacks that the effective area for receiving raw particles to be separated is very small relative to the overall dimension of the machine, the supplied particles tend to stay in the aforementioned group of induced poles, and supplying of raw particles and removing of concentrated particles can not be performed smoothly.
  • a generally doughnut-like pole box 2' is rotated while kept horizontally so as to pass through the magnetic field created by an electromagnet 1, with pole box 2' filled by a group of induced poles 3' comprising a number of twisted short rods or balls.
  • Raw particles to be separated are fed from an ore supply conduit 4' to the pole box 2' at a point before crossing the magnetic field, thus, the non-magnetic particles of the raw material do not receive the strong magnetic action of the electromagnet 1' and fall downward immediately to be discharged, while magnetic particles are attracted by the group of induced poles within the pole box 2' and carried'as the pole box 2' rotates.
  • the effective separating zone is very small relative to the overall dimension of the machine because the zone is limited to only a portion of the doughnut-like pole box 2' of a small crosssection area. It is impossible to increase the supply rate of raw particles because the length of the doughnut-like pole box 2' in the axial direction is relatively long and the separation performance is poor because raw particles stay partly in the space of the group of induced poles within the pole box. In addition, by the drop of raw particles, magnetic particles tend to be carried away with non-magnetic particles.
  • a cage drum 2" of the trommel type rotates; passing through the magnetic field created by an electromagnet l, and a group of induced poles 3" fills the drum 2"group of induced poles 3" fills the drum 2 as in the machine of FIG. 12.
  • Raw material to be separated is fed through a narrow groove 4" formed on an electromagnet core with its center line crossing the center of the drum 2" into the inside of the drum and magnetic particles of the fed raw material are attracted upon the surface portions of the group of induced poles and carried forward as the drum 2" rotates, and then, at the point where a given portion of the group of induced poles leaves the magnetic field of the electromagnet 1" and have a decreased magnetic force, these magnetic particles are released from the group of induced poles to be collected. On the other hand, the non-magnetic particles are not atrracted, thus, fall down immediately whereby they are discharged.
  • This type of magnetic separator does not utilize effectively the space of the: drum 2" because the raw material is fed only to a portion of the inner periph cry of the drum, and provides a very poor separation performance characteristic, like the separator shown in FIG. 12.
  • the electromagnets l' (1") in such a form that the opposing pole pieces of the electromagnet hold therebetween, a portion of the doughnut-like pole box or drum in order to cause the group of induced poles filling the drum to rotate and move through the mag netic field created by the pole pieces. Therefore, the size of the electromagnet l (1") is limited in a structural point of view and a large number of magnets can not be mounted in the machine.
  • the effective working zone of the magnetic field formed by the electromagnet l (1") is limited to only a portion of the pole box or drum, resulting in a small effective zone for particle separation. Further, since it is necessary to dispose one of the electromagnet pole pieces outside the pole box or drum, the machine has a disadvantage that its structure is large and complex.
  • a wet type magnetic separator comprises a generally cylindrical stationary magnet device having a cut away recess open fom the top of the cylindrical body to one side along its periphery and an axis which is so fixed that it holds substantially horizontally, a rotary drum disposed coaxially with and rotatably about in close proximity said stationary magnet device, and a group of induced poles made of substance of high magnetic permeability are provided around said rotary drum to effect separation of magnetic particles of supplied raw material.
  • the aforesaid stationary magnet device consists of sets of plural permanent magnets each having the same cut away recess and yokes having a similar configuration to said magnets in which they are coaxially aligned in side-by-side arrangement and assembled by putting in order their cut away recesses into an integral body such that said sets of plural permanent magnets are sandwiched between respective yokes with adjacent yokes having opposite polarities.
  • raw particles to be separated are fed to about the top of the rotary drum and then move together with the group of induced poles along the circumference of the stationary magnet device in accordance with the rotation of the rotary drum.
  • non-magnetic particles are not subjected to the attraction force of the magnetic field generated from the stationary magnet device, so that the nonmagnetic particles are permitted to fall down at a certain rotating position of the rotary drum, whereas magnetic particles are attracted and held about the rotary drum by the group of induced poles magnetized by the stationary magnet device andthen fall down from the rotary drum at a second rotating position of the rotary drum, where the rotary drurn passes through the cut away recess of the stationary magnet device because the magnetic force of the stationary magnet device and the group of induced poles is decreased at that position, with the magnetic particles washed away by means of shower devices.
  • the aforesaid rotary drum is generally made of nonmagnetic substance, but, in order to enhance the separation performance, a substance of high magnetic permeability is preferably provided to portions of the rotary drum corresponding to the yokes of the stationary magnet device to form another group of induced poles (hereinafter represented as a second group of induced poles, therefore, the aforesaid group of induced poles except the second group of induced poles are represented as a first group of induced poles hereinafter).
  • FIG. 1A is an elevational cross-sectional view of a first embodiment of a magnetic separator according to the present invention.
  • FIG. 1B is an elevational cross-sectional view of a modification of the first embodiment shown in FIG. 1A.
  • FIG. 2 is an elevational cross-sectional view of a second embodiment of the magnetic separator according to the present invention.
  • FIG. 3A is an elevational cross-sectional view of a third embodiment of the magnetic separator according to the present invention.
  • FIG. 3B is an elevational cross-sectional view of a modification of the third embodiment shown in FIG. 3A.
  • FIG. 4 is an elevational cross-sectional view of a fourth embodiment of the magnetic separator according to the present invention.
  • FIG. 5 is an elevational cross-sectional view of a fifth embodiment of the magnetic separator according to the present invention.
  • FIG. 6 is an axial enlarged partial cross-sectional view of the embodiments shown in FIGS. 1A, 1B, 2, 3A and 38.
  • FIG. 7 is an axial enlarged partial cross-sectional view of the embodiment shown in FIG. 4.
  • FIG. 8 is an axial enlarged partial elevational crosssectional view of another embodiment of the present invention using the rotary drum shown in FIG. 9 or FIG. 10.
  • FIG. 9 is an explanatory perspective view of a modification of the rotary drum.
  • FIG. 10 is an explanatory perspective view of another modification of the rotary drum.
  • FIG. 11 is an axial enlarged partial elevational crosssectional view of another embodiment of the present invention including the stationary magnet device, the rotary drum shown in FIG. 8 or FIG. 9 and the first group of induced poles having a circle configuration in their section.
  • FIGS. 12 and 13 are explanatory perspective views of the typical prior art magnetic separators explained hereinabove.
  • FIG. 1A a first embodiment of the present invention is described as follows.
  • Numeral 1 shows a generally cylindrical stationary magnet device which has a cut away recess and which is so fixed that its axis is held substantially horizontal.
  • the elevational cross-sectional view of the stationary magnet device taken along the axis thereof is as shown in FIGS. 6, 7, 10 and 11, that is, the stationary magnet device 1 comprises sets of plural discal permanent magnets 9, which are so assembled that the said plural discal permanent magnets made of, for example, an isotropic ferrite each having the same cut away recess are coaxially aligned in side-by-side arrangement and respective cut away recesses are put in order.
  • Yokes 10 made of, for example, iron plate, each having a similar configuration to the said magnets, are coaxially aligned in side-by-side arrangement and assembled into an integral body such that respective sets of plural discal permanent magnets are sandwiched between respective yokes by putting in order their cut away recesses so that respective adjacent yokes have opposite polarities.
  • constructed stationary magnet device 1 generates on the outside a strong magnetic field extending radially continuously and stripedly in the axial direction.
  • a hollow rotary drum 2 is coaxially disposed with respect to the stationary magnet device and rotatably in the arrow a direction and in close to the periphery thereof.
  • the rotary drum 2 is normally made of non-magnetic substance, but the rotary drum 2 is suitably improved as described below.
  • a first group of induced poles 3 made of substance of high magnetic permeability, such as soft iron, Fe-Ni alloy (permalloy), or Fe-Co alloy (permendur).
  • This first group of induced poles 3 functions to induce a high intensity magnetic field in spaces or gaps between respective members of the first group of induced poles 3 in response to the magnetic action of the stationary magnet device.
  • the first group of induced poles 3 having such a configuration as ball, rod, ring, endless chain or endless net can be employed, among which ball-like members are preferably employed.
  • the first group of induced poles 3 used in the first embodiment of the magnetic separator of the present invention has a ball-like configuration and it is fixed to the peripheral surface of the rotary drum 2 with adhesives or welding as shown in FIG. 1A.
  • some means for separating the magnetic particles from the first group of induced poles 3 when a magnetic separator that the first group of induced poles 3 is not fixed onto the peripheral surface of the rotary drum, is used because the first group of induced poles 3 is withdrawn together with the magnetic particles from a second hopper 8 for collecting the magnetic particles, on the contrary, in the magnetic separator such as the aforesaid first embodiment, separating means are not required.
  • Raw particles to be separated are fed from a raw material supplying device 4 disposed above the rotary drum 2 onto the rotary drum 2 and are carried by the rotary drum 2 during which time, they are subjected to a separation operation. That is, since non-magnetic particles of the raw material do not receive the magnetic action from the stationary magnet device, they fall down into the liquid at a certain rotating position of the rotary drum 2 and are collected by a first hopper 5 for collecting nonmagnetic particles where they are removed through an ejecting port 6. On the other hand, magnetic particles are attracted by the first group of induced poles 3 provided around the rotary drum 2, magnetized by the stationary magnet device 1 and, thus, pass to the underside the stationary magnet device 1 in response to rotation of the rotary drum 2.
  • the magnetic particles break away from the rotary drum 2 and the first group of induced poles 3 because of the reduction of magnetic force and by means of shower devices and fall down into the second hopper 8.
  • the magnetic particles are withdrawin.
  • Pulp is stored into a casing consisting of the first hopper 5 and the second hopper 8 in order to perform effectively the separating operation for magnetic particles and non-magnetic particles.
  • the rotary drum 2 and the first group of induced poles 3 are partially immersed in pulp.
  • the level of pulp fluid b is preferably selected high in order to reduce the influence of flowing pulp and to enhance detachability of non-magnetic particles from the rotary drum surface and of magnetic particles from the first group of induced poles 3 and collection efficiency; but, it is also necessary to select the pulp level depending upon the supply rate of the raw particles in a manner such that the pulp does not flow away from the rotary drum surface.
  • Numerals 7a and 7b show a shower device or nozzle.
  • the shower device 7a is disposed at the left-hand upper portion of the rotary drum 2 in close to the rotary drum 2 and functions to magnetically and positively adhere magnetic particles among raw material to the first group of induced poles 3 and to the rotary drum 2.
  • the shower device 7b disposed at the right-hand portion in the vicinity of the rotary drum 2 is required to enhance the separating of magnetic particles from the rotary drum 2 and the first group of induced poles 3.
  • a turned-up shower device 7b functions to enhance separation of the magnetic particles from the rotary drum 2 and the first group of induced poles 3 and to prevent the thus separated magnetic particles from flowing back into the first hopper 5. It should be noted that the number of showers to be employed in the magnetic separator of the present invention can be selected freely as occasion arises.
  • a partition board 19 may be disposed between the hoppers 5 and 8 at a position at the beginning of the cut away recess of the stationary magnet device 1, in order to effectively achieve separation and collection of non-magnetic and magnetic particles, which extends axially of the rotary drum 2 and upwardly above the pulp level b and in close to the periphery of the first group of induced poles 3 about the rotary drum 2.
  • board 19 the magnetic particles carried by the magnetic force of the fixed magnet device 1 and the first group of induced poles 3 can be prevented from flowing back into the hopper 5.
  • FIG. 1B shows a modification of the first embodiment of the present invention shown in FIG. 1A wherein the partition board 19 is fully immersed in the pulp. It is an advantage of this modification that the partition board 19 may be easily disposed and the air duct 20 is not required.
  • This type magnetic separator is preferably used in case of separation of such raw material having considerably large particle size.
  • FIG. 2 shows a second embodiment of the magnetic separator according to the present invention, wherein members comprising the first group of induced poles 3 are fed continuously from a first group of induced poles feed device 11 to the outer periphery of the rotary drum 2, which feed device 11 is disposed in a position in the vicinity of the top of the rotary drum 2 where the magnetic force of the stationary magnet device 1 begins to act on the first group of induced poles, that is, this feed device 11 is located slightly before the position where the periphery of the stationary magnet device 1 begins to have the full radius and behind in the direction of the drum rotation the position where the raw material is fed.
  • a device 12 is disposed adjacent the first group of induced poles feed device 11 as a means for evenly aligning the members of the first group of induced poles fed upon the surface of the rotary drum 2 into the form of a layer.
  • Device 12 is located immediately in front of the first group of induced poles feed device 11 and behind the raw material supplying device 4. According to this second embodiment, it not only takes time for fixing the first group of induced poles 3 onto the periphery of rotary drum 2, but allows one to select the most preferable first group of induced poles in response to the state and composition of raw material to be separated.
  • FIG. 3A shows a third embodiment of the magnetic separator of the present invention.
  • this embodiment has a number of holder plates 14, each having substantially the same height as the depth of the first group of induced poles layer employed on the peripheral surface of rotary drum which are radially placed onto the periphary of the rotary drum 2 at appropriate intervals one after another, in order to pressure the first group of induced poles 3.
  • a net 13 covers at least the lower half periphery of the rotary drum 2 in close proximity thereto and fixed to the base body, etc.
  • the magnetic separator according to this third embodiment can obtain a separation efficiency similar to that of the embodiments shown in FIGS.
  • FIG. 3B shows a modification of the above-described third embodiment of the magnetic separator of the present invention wherein the net 13 covers the whole periphery of the rotary drum 2.
  • the holder plates 14 are not necessary. It will be understood by those skilled in the art that, in case of use of the net 13, the size of mesh of the net 13 is selected to be larger than the size of particles of the raw material, while smaller than the size of members of the first group of induced poles.
  • ball or rod members comprise the first group of induced poles 3, but, the present invention can use endless net-like members or a number of chain members, in place of the aforementioned members, to form the first group of induced poles in which case they are hung upon the drum sur face between end flanges of the rotary drum.
  • FIG. 4 shows a fourth embodiment of the magnetic separator of the present invention.
  • the first group of induced poles 3 used in this embodiment comprises an endless chain net covering the whole periphery of the rotary drum 2 between either flanges thereof or a plurality of endless chains covering the whole periphery of the rotary drum 2 each arranged side-by-side like a chain feeder.
  • Numerals l5 and 16 show a sub drum for controlling the first group of induced poles 3 as described above, and a press drum, respectively, however, both sub drum l5 and press drum 16 are not always necessary.
  • the chainlike first group of induced poles 3 rotates together with the rotary drum 2 in such a manner that a part of the group 3 adheres magnetically to the peripheral surface of he rotary drum 2, while another part hangs down slightly from the peripheral surface of the rotary drum 2 by the action of gravity.
  • the magnetic particles are magnetically adhered and held at the adhered part of the chain-like first group of induced poles 3 after they are separated from nonmagnetic particles, and then they break away and fall down from the chainlike first group of induced poles 3 at the hung down part thereof.
  • this type magnetic separator is that the magnetic particles magnetically adhered to the chain-like first group of induced poles 3 effectively break away from the peripheral surface of rotary drum 2 and the chain-like first group of induced poles 3 without magnetic particles remaining between respective spaces of the chain-like first group of induced poles 3 and between the chain-like first group of induced poles 3 and the peripheral surface of the rotary drum 2 by existence of a slight gap formed between the chain-like first group of induced poles 3 and the peripheral surface of the rotary drum 2 at the hung down part of the chain-like first group of induced poles 3.
  • FIG. 5 shows a fifth embodiment of the magnetic separator of the present invention.
  • the first group of induced poles 3 employed in this embodiment comprises a plurality of rings having the same inner diameter as the outer diameter of the rotary drum 2 or slightly smaller inner diameter than the outer diameter of the rotary drum 2 and are mounted on the periphery of the rotary drum 2 close to one another.
  • the characteristic of this fifth embodiment is that manufacture and equipment of the first group of induced poles is easy and the magnetic particles magnetically adhered to the first group of induced poles 3 can easily break away because no space or gap is formed between respective members of the first induction pole group 3.
  • FIG. 6 shows the relation among the stationary magnet device l, the rotary drum 2 and the ball-like first group of induced poles 3 in the embodiments shown in FIGS. 1A, 1B, 2, 3A and 3B.
  • the members of the first group of induced poles 3 are arranged at random.
  • FIG. 7 shows the relation among the stationary mag net device 1, the rotary drum 2 and the chain-like first group of induced poles 3 in the fourth embodiment shown in FIG. 4.
  • the present invention provides also improved structures of the rotary drum 2 as shown in FIGS. 8 and 9 which are improved structurally and fundamentally over the magnetic separator. That is, in order to prevent decaying of the magnetic field generated by the stationary magnet device 1, even at the outer surface of the rotary drum 2, rather to strengthen the same, the present invention provides a rotary drum of the type in which a second group of induced poles made of substance of high magnetic permeability is mounted on portions of the rotary drum 2 facing or corresponding to yokes 10 of the stationary magnet device.
  • the second group of induced poles By providing the second group of induced poles, it is possible to reduce the magnetic reluctance in the path from the yokes 10 to the rotary drum, to increase the magnetic flux emitted from the yokes 10, and to concentrate the magnetic flux passing to the second group of induced poles.
  • FIG. 8 is an enlarged partial elevational cross sectional view of the combination of the stationary magnet device and the rotary drum with the second group of induced poles taken along the axis thereof.
  • the positions of the rotary drum 2 made of non-magnetic substance corresponding to or facing the yokes l0 magnetized by the permanent magnets 9 are replaced by members of the second group of induced poles 17.
  • the width of each member of the second group of induced poles 17 is selected to be equal to the width of the re spective yokes 10, but it can be selected desirably if it is satisfied that the second group of induced poles does not come too near the adjacent ones aligned axially and polarized oppositely.
  • the second group of induced poles 17 is distributedly provided substantially on all the several circumferential portions of the rotary drum opposing the yokes 10, wherein they may be constructed in the continuous ring shape as shown in FIG. 9 in perspective view or in the form of separate striplike plates 17' spaced with a gap 18' as shown in FIG. 10. Further, this second group of induced poles can be attached on the desired portions of the outer surface of the rotary drum 2 by means of adhesive or welding, or it can be secured to the rotary drum by fitting it in grooves or through-holes formed in the desired corresponding portions. Of course, other well known methods can also be employed.
  • the two basic types of magnetic separators according to the present invention have been explained, that is, the first type including the rotary drum made wholly of non-magnetic substance with the first group of induced poles provided therearound, and the second type including the rotary drum made generally of non-magnetic substance with its selected surface portions corresponding to the yokes l0 replaced by the second group of induced poles not including the first group of induced poles.
  • the present invention provides further another type of magnetic separator which is a combination of the rotary drum of the above second type of magnetic separator with the first group of induced poles employed in the first type of magnetic separator.
  • FIG. 11 is an axial enlarged partial elevational cross sectional view of a main'portion of a magnetic separator according to the present invention, which employs the rotary drum having the second group of induced poles shown in FIG. 8 and the first group of induced poles in the form of ball members.
  • the inventors of the instant application have done the following two experiments in order to evaluate the difference in intensity of magnetic field in locations about the rotary drum between one drum including the second group of induced poles and another drum having no second group of induced poles.
  • EXPERIMENT 1 We prepared two rotary drums: first rotary drum D of the hollow cylinder type made wholly of nonmagnetic substance and having a thickness of about 4 mm, inside which, the yokes are disposed at a distance of about 5 mm from the outer circumference thereof to the inner periphery of drum D and a second rotary drum D having the same dimension and arrangement as that of first rotary drum D except that the circular bandlike portions of second rotary drum D corresponding to the yokes are replaced by soft iron ring plates of about 4 mm thickness, functioning as the second group of induced poles.
  • the permanent magnet device is preferable for getting a desired intensity of magnetic field under a given dimensional limitation, because the permanent magnet permits free selection of the number of pole pieces and of their size and does not consume electric power.
  • the present invention utilizes effectively the properties of the first and/or second group of induced poles, simply strengthens the intensity of magnetic field on the drum surface, utilizes effectively the induced high intensity of magnetic field, and improves remarkably the selection performance of the magnetic separator.
  • the whole outer peripheral surface of the rotary drum is utilized as the effective separation area
  • the yokes are constructed in the ring form extending circumferentially
  • the oppositely polarized yokes are aligned alternately in the axial direction, so that the area of receiving the raw particles is very wide and the field effective area is also large whereby the selection functioning area is remarkably increased.
  • the magnetic separator constructed according to the present invention has the advantage that since the attracted magnetic particles can be continuously collected and removed, the processing rate per unit time is large; since the raw particles are supplied to the top of the rotary drum with the result that they first fall down onto the drum surface and, then, only non-magnetic particles fall down calmly into water in response to rotation of the drum, all particles surely have the chance that they receive magnetic attraction action in the initial stage; since all particles float over the water and fall down thereinto, and thereby the particles are calmly separated in the water; and because of a high efficiency of collection of magnetic particles and an increased intensity of magnetic field, the present separator can separate and concentrate effectively very fine magnetic particles and poor-magnetic particles that could hardly be separated in the conventional magnetic separators. Specifically, the instant magnetic separator can separate particles of smaller than 1 micron in size.
  • EXAMPLE 1 Model A magnetic separator of the arrangement as shown in FIG. 1A including: a stationary magnet device comprising eight permanent magnet bodies each consisting of three discal anisotropic ferrite permanent magnets of 798 mm diameter and 12 mm thickness with a cut away or recess of 1 10 open angle, and nine yokes of 798 mm diameter and 6 mm thickness with a cut away or recess of 1 10 open angle, these permanent magnet bodies and yokes being aligned alternately in the axial direction in side-by-side arrangement with their cut aways registered; a rotary drum made of nonmagnetic stainless of 800 mm inner diameter and 3 mm thickness; and soft iron balls of 10 1 1 mm diameter employed as the first group of induced poles.
  • a stationary magnet device comprising eight permanent magnet bodies each consisting of three discal anisotropic ferrite permanent magnets of 798 mm diameter and 12 mm thickness with a cut away or recess of 1 10 open angle, and nine yokes of 798
  • Table 3 shows the results of a separation test done in connection with above Model A magnetic separator of the present invention and one typical conventional magnetic separator as shown in FIG. 9 by use of the same raw particles, where the raw material used in the test was fine powder obtained by grinding ore and adding fine ferro-nickel thereto the powder size of which was in the order that a comb of 20 microns passes of the total.
  • the raw material used in the test was fine powder obtained by grinding ore and adding fine ferro-nickel thereto the powder size of which was in the order that a comb of 20 microns passes of the total.
  • double separation steps were performed with respect to the conventional separator, while a single separation step was performed in Model A separator, were the Concentrate in Table 3 defines the twice separated and concentrated magnetic particles and the Tailing defines the sum of non-attracted reminder in the two separation processes in the conventional separator.
  • the Model A separator according to the present invention is superior to the conventional magneticseparator in that the processable amount is higher than that of the conven- Aswill be noted fromthe data in Table 4, the separator including the rotary drum with the second group of induced poles provides an increased amount of material processing.
  • Model B magnetic separator including: a stationary t0 the outer periphery of the rotary drum by means of magnet device comprising eight p rm e t g t adhesive to provide the first group of induced poles.
  • Concentrate is the amount of magnetically atrracted l.
  • a wet type magnetic separator for separating mag and collected particles in the single separation process netic particles from raw material particles, said separaand the Tailing is the amount of particles not attor comprising a generally cylindrical stationary magtracted magnetically. net device in the form of a cylindrical body having a cut Tab1e4 Machine Rate of Feed Ni Content (71) Ni (Kg/hr) 1 Recovery (7r) Feed Concentrate Tailing 1,300 0.71 2.03 0.52 36.0 Model 2,700 0.71 2.19 0.60 21.3 2 5,300 0.71 2.27 0.64 9.8
  • said cylindrical body consisting of a plurality of sets of multiple discal permanent magnets each having a cut away recess and discal yokes each having a similar configuration to said magnets, said plurality of sets of permanent magnets and said yokes being coaxially mounted side by side with their cut away recesses coinciding and being assembled into an integral body with the sets of permanent magnets sandwiched between said yokes so that adjacent yokes have opposite polarity to each other, rotary drum disposed coaxially with and rotatable about and in close proximity to said stationary cylindrical body, said rotary drum including axially spaced nonmagnetic material portions separated by circumferential strips of material of high magnetic permeability, said strips being in alignment respectively with said yokes and forming low reluctance paths for the magnetic field across the gap between the drum and said cylindrical body and defining a first group of induced pole
  • said second group of induced poles comprises at least one endless net holding capsule shaped members closely connected together in a lattice arrangement on the drum periphery.
  • said said second group of induced poles comprises at least one endless net holding ball members closely connected together in a lattice arrangement on the drum periphery.

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US00273580A 1971-07-20 1972-07-20 Magnetic separator Expired - Lifetime US3856666A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP46053565A JPS5038221B1 (enExample) 1971-07-20 1971-07-20
JP46053566A JPS5123924B1 (enExample) 1971-07-20 1971-07-20
JP5603171A JPS5520747B1 (enExample) 1971-07-28 1971-07-28
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Cited By (29)

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US4046679A (en) * 1975-11-28 1977-09-06 Raytheon Company Magnetic drum materials separator
US4080760A (en) * 1977-02-18 1978-03-28 Wheelabrator-Frye Inc. Surface treatment device including magnetic shot separator
US4144163A (en) * 1975-06-05 1979-03-13 Sala Magnetics, Inc. Magnetodensity separation method and apparatus
US4267245A (en) * 1979-07-25 1981-05-12 Minolta Camera Kabushiki Kaisha Method of removing foreign materials from magnetic developers
US6149014A (en) * 1997-12-04 2000-11-21 Eriez Manufacturing Co. Mill magnet separator and method for separating
US20030196935A1 (en) * 2002-04-19 2003-10-23 Miles David Roger Magnetic separation system and method for separating
US20080011650A1 (en) * 2004-08-24 2008-01-17 Gekko Systems Pty Ltd Magnetic Separation Method
US20080164183A1 (en) * 2007-01-09 2008-07-10 Marston Peter G Collection system for a wet drum magnetic separator
US20080210613A1 (en) * 2007-01-09 2008-09-04 Ionel Wechsler System and method for removing dissolved contaminants, particulate contaminants, and oil contaminants from industrial waste water
CZ301085B6 (cs) * 2007-01-14 2009-11-04 SVÚM, a. s. Hnací magnetický buben
US20100213123A1 (en) * 2007-01-09 2010-08-26 Marston Peter G Ballasted sequencing batch reactor system and method for treating wastewater
US20110036771A1 (en) * 2007-01-09 2011-02-17 Steven Woodard Ballasted anaerobic system and method for treating wastewater
CN102728460A (zh) * 2012-06-18 2012-10-17 廖明勇 循环式自动除铁机
US8470172B2 (en) 2007-01-09 2013-06-25 Siemens Industry, Inc. System for enhancing a wastewater treatment process
CN103495501A (zh) * 2013-10-16 2014-01-08 尹克胜 无污水和固体废物排放的晶体硅加工废砂浆专用除铁机
CN103495500A (zh) * 2013-09-23 2014-01-08 长沙矿冶研究院有限责任公司 从选铁厂尾矿中低能耗分选钛铁矿的方法
US20140360362A1 (en) * 2013-06-06 2014-12-11 General Electric Company Method and systems for particle separation in an exhaust gas recirculation system
CN104923393A (zh) * 2015-05-13 2015-09-23 马鞍山市天工科技有限公司 一种耐磨防堵塞的永磁湿式粗粒预选磁选机
CN105170317A (zh) * 2015-08-19 2015-12-23 刘洋 一种永磁吸铁器
US9381521B2 (en) * 2014-09-18 2016-07-05 Outotec (Finland) Oy Hot magnetic separator including heat shield
CN106238203A (zh) * 2016-08-04 2016-12-21 中钢集团安徽天源科技股份有限公司 一种新型湿式永磁磁选机
US9651523B2 (en) 2012-09-26 2017-05-16 Evoqua Water Technologies Llc System for measuring the concentration of magnetic ballast in a slurry
EP3097980A4 (en) * 2014-01-25 2017-09-13 Shandong Huate Magnet Technology Co., Ltd. Magnetic separator for improving grade of refined ore and reducing slags
CN108940879A (zh) * 2017-10-30 2018-12-07 国华宝环保科技（深圳）有限公司 等离子体物理矿石分选处理方法及其系统
CN110116046A (zh) * 2019-05-22 2019-08-13 宜昌明珠磷化工业有限公司 一种带搅拌装置的矿用磁选机及磷矿石的分选方法
US10919792B2 (en) 2012-06-11 2021-02-16 Evoqua Water Technologies Llc Treatment using fixed film processes and ballasted settling
CN115178374A (zh) * 2022-06-21 2022-10-14 湖南科美达电气股份有限公司 一种由旋转磁场驱动外筒的磁选机
US11590512B2 (en) * 2020-02-28 2023-02-28 Sintokogio, Ltd. Magnetic separating apparatus and magnetic sorting method
US11865549B2 (en) * 2019-07-19 2024-01-09 DRP Ventures Inc. Method and apparatus for recovery of magnetite and magnetite bearing elements from a slurry

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GB2151950B (en) * 1983-12-27 1987-12-02 De Beers Ind Diamond Magnetic separators
AT385921B (de) * 1985-06-11 1988-06-10 Gerhold Juergen Dr Trockener zentrifugalkraftmagnetscheider mit drehteller
FR3020971B1 (fr) * 2014-05-13 2017-12-08 Mohamad Ali Marashi Procede et dispositif de traitement de minerai contenant des particules ferromagnetiques.
FR3020970B1 (fr) * 2014-05-13 2016-06-03 Mohamad Ali Marashi Dispositif mobile et procede de traitement de minerai contenant des particules ferromagnetiques.
CN116510894A (zh) * 2023-06-12 2023-08-01 中钢天源安徽智能装备股份有限公司 一种多功能湿式磁选机及工作方法

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US2074085A (en) * 1935-05-20 1937-03-16 Samuel G Frantz Magnetic separator
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GB557810A (en) * 1943-03-25 1943-12-07 Herbert Huband Thompson Improvements in or relating to magnetic separators
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US3327852A (en) * 1964-12-18 1967-06-27 Sala Maskinfabriks Aktiebolag Drum type magnetic separator
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SU290770A1 (enExample) * В. И. Кармазин, В. В. Кармазин , Е. А. Попков Днепропетровский горный институт Артема
GB190516643A (en) * 1905-08-16 1905-11-09 Hernadthaler Ung Eisenindustri Improvements in and relating to the Treatment of Iron Ores
US2074085A (en) * 1935-05-20 1937-03-16 Samuel G Frantz Magnetic separator
DE732229C (de) * 1940-12-31 1943-02-25 Krupp Fried Grusonwerk Ag Vorrichtung zur elektromagnetischen Abscheidung von Magnetit aus Trueben
GB557810A (en) * 1943-03-25 1943-12-07 Herbert Huband Thompson Improvements in or relating to magnetic separators
DE855081C (de) * 1944-06-28 1952-11-10 Kloeckner Humboldt Deutz Ag Trommelmagnetscheider
US2711249A (en) * 1954-05-20 1955-06-21 Fur Unternehmungen Der Eisen U Drum magnet separator
GB869210A (en) * 1958-09-12 1961-05-31 Heinrich Sommermeyer Improvements in or relating to filter systems
US2992738A (en) * 1959-04-20 1961-07-18 Indiana General Corp Permanent magnet separator
US3163396A (en) * 1962-06-20 1964-12-29 Ass Elect Ind Means for the discharge of liquid from rotors
US3349918A (en) * 1963-12-13 1967-10-31 Kiyohiko Iki Magnetizable-particle type filtration apparatus capable of performing continuous filtering operation
US3327852A (en) * 1964-12-18 1967-06-27 Sala Maskinfabriks Aktiebolag Drum type magnetic separator
US3489280A (en) * 1966-02-03 1970-01-13 Eriez Mfg Co Magnetic separator having field shaping poles
US3375925A (en) * 1966-10-18 1968-04-02 Carpco Res & Engineering Inc Magnetic separator
US3690454A (en) * 1969-11-18 1972-09-12 Georgy Alexandrovich Bekhtle Method and apparatus for magnetic concentration with ferromagnetic soft iron bodies

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4144163A (en) * 1975-06-05 1979-03-13 Sala Magnetics, Inc. Magnetodensity separation method and apparatus
US4046679A (en) * 1975-11-28 1977-09-06 Raytheon Company Magnetic drum materials separator
US4080760A (en) * 1977-02-18 1978-03-28 Wheelabrator-Frye Inc. Surface treatment device including magnetic shot separator
US4267245A (en) * 1979-07-25 1981-05-12 Minolta Camera Kabushiki Kaisha Method of removing foreign materials from magnetic developers
US6149014A (en) * 1997-12-04 2000-11-21 Eriez Manufacturing Co. Mill magnet separator and method for separating
US20030196935A1 (en) * 2002-04-19 2003-10-23 Miles David Roger Magnetic separation system and method for separating
US6832691B2 (en) * 2002-04-19 2004-12-21 Rampage Ventures Inc. Magnetic separation system and method for separating
US7743926B2 (en) * 2004-08-24 2010-06-29 Gekko Systems Pty Ltd Magnetic separation method
US20080011650A1 (en) * 2004-08-24 2008-01-17 Gekko Systems Pty Ltd Magnetic Separation Method
US20110036771A1 (en) * 2007-01-09 2011-02-17 Steven Woodard Ballasted anaerobic system and method for treating wastewater
US8623205B2 (en) 2007-01-09 2014-01-07 Siemens Water Technologies Llc Ballasted anaerobic system
US10023486B2 (en) 2007-01-09 2018-07-17 Evoqua Water Technologies Llc Ballasted sequencing batch reactor system and method for treating wastewater
US20080164184A1 (en) * 2007-01-09 2008-07-10 Marston Peter G Fluidic sealing system for a wet drum magnetic separator
US20100213123A1 (en) * 2007-01-09 2010-08-26 Marston Peter G Ballasted sequencing batch reactor system and method for treating wastewater
US8845901B2 (en) 2007-01-09 2014-09-30 Evoqua Water Technologies Llc Ballasted anaerobic method for treating wastewater
EP2101919A4 (en) * 2007-01-09 2012-08-22 Siemens Industry Inc IMPROVED COLLECTION SYSTEM FOR WET DRUM MAGNETIC SEPARATOR
US8840786B2 (en) 2007-01-09 2014-09-23 Evoqua Water Technologies Llc System and method for removing dissolved contaminants, particulate contaminants, and oil contaminants from industrial waste water
US8470172B2 (en) 2007-01-09 2013-06-25 Siemens Industry, Inc. System for enhancing a wastewater treatment process
US8506800B2 (en) 2007-01-09 2013-08-13 Siemens Industry, Inc. System for enhancing a wastewater treatment process
US8540877B2 (en) 2007-01-09 2013-09-24 Siemens Water Technologies Llc Ballasted sequencing batch reactor system and method for treating wastewater
US20080210613A1 (en) * 2007-01-09 2008-09-04 Ionel Wechsler System and method for removing dissolved contaminants, particulate contaminants, and oil contaminants from industrial waste water
US8702987B2 (en) 2007-01-09 2014-04-22 Evoqua Water Technologies Llc Methods for enhancing a wastewater treatment process
US20080164183A1 (en) * 2007-01-09 2008-07-10 Marston Peter G Collection system for a wet drum magnetic separator
US8673142B2 (en) 2007-01-09 2014-03-18 Siemens Water Technologies Llc System for enhancing a wastewater treatment process
CZ301085B6 (cs) * 2007-01-14 2009-11-04 SVÚM, a. s. Hnací magnetický buben
US10919792B2 (en) 2012-06-11 2021-02-16 Evoqua Water Technologies Llc Treatment using fixed film processes and ballasted settling
CN102728460A (zh) * 2012-06-18 2012-10-17 廖明勇 循环式自动除铁机
CN102728460B (zh) * 2012-06-18 2014-09-24 廖明勇 循环式自动除铁机
US9651523B2 (en) 2012-09-26 2017-05-16 Evoqua Water Technologies Llc System for measuring the concentration of magnetic ballast in a slurry
US20140360362A1 (en) * 2013-06-06 2014-12-11 General Electric Company Method and systems for particle separation in an exhaust gas recirculation system
CN103495500A (zh) * 2013-09-23 2014-01-08 长沙矿冶研究院有限责任公司 从选铁厂尾矿中低能耗分选钛铁矿的方法
CN103495500B (zh) * 2013-09-23 2016-03-30 长沙矿冶研究院有限责任公司 从选铁厂尾矿中低能耗分选钛铁矿的方法
CN103495501A (zh) * 2013-10-16 2014-01-08 尹克胜 无污水和固体废物排放的晶体硅加工废砂浆专用除铁机
EP3097980A4 (en) * 2014-01-25 2017-09-13 Shandong Huate Magnet Technology Co., Ltd. Magnetic separator for improving grade of refined ore and reducing slags
US9833791B2 (en) 2014-01-25 2017-12-05 Shangdong Huate Magnet Technology Co., Ltd Magnetic separator for improving grade of refined ore and reducing slags
US9381521B2 (en) * 2014-09-18 2016-07-05 Outotec (Finland) Oy Hot magnetic separator including heat shield
CN104923393A (zh) * 2015-05-13 2015-09-23 马鞍山市天工科技有限公司 一种耐磨防堵塞的永磁湿式粗粒预选磁选机
CN104923393B (zh) * 2015-05-13 2017-03-01 马鞍山市天工科技股份有限公司 一种耐磨防堵塞的永磁湿式粗粒预选磁选机
CN105170317A (zh) * 2015-08-19 2015-12-23 刘洋 一种永磁吸铁器
CN106238203B (zh) * 2016-08-04 2018-06-19 中钢集团安徽天源科技股份有限公司 一种新型湿式永磁磁选机
CN106238203A (zh) * 2016-08-04 2016-12-21 中钢集团安徽天源科技股份有限公司 一种新型湿式永磁磁选机
CN108940879A (zh) * 2017-10-30 2018-12-07 国华宝环保科技（深圳）有限公司 等离子体物理矿石分选处理方法及其系统
CN108940879B (zh) * 2017-10-30 2024-04-05 量函(深圳)储能技术发展科技有限公司 等离子体物理矿石分选处理方法及其系统
CN110116046A (zh) * 2019-05-22 2019-08-13 宜昌明珠磷化工业有限公司 一种带搅拌装置的矿用磁选机及磷矿石的分选方法
US11865549B2 (en) * 2019-07-19 2024-01-09 DRP Ventures Inc. Method and apparatus for recovery of magnetite and magnetite bearing elements from a slurry
US11590512B2 (en) * 2020-02-28 2023-02-28 Sintokogio, Ltd. Magnetic separating apparatus and magnetic sorting method
CN115178374A (zh) * 2022-06-21 2022-10-14 湖南科美达电气股份有限公司 一种由旋转磁场驱动外筒的磁选机

Also Published As

Publication number Publication date
FR2146439B1 (enExample) 1976-03-12
SE384633B (sv) 1976-05-17
GB1389300A (en) 1975-04-03
DE2235271B2 (de) 1976-02-26
FR2146439A1 (enExample) 1973-03-02
PH10673A (en) 1977-08-05
AU470426B2 (en) 1976-03-18
DE2235271A1 (de) 1973-03-01
AU4480672A (en) 1974-01-24
CA978501A (en) 1975-11-25

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