Annular iron removal device and method

Abstract

The present invention relates to an annular iron removal device and method, the annular iron removal device comprises an annular discharge hopper and an iron removal device; an annular discharge hopper is arranged below a gyratory crusher, and an annular iron removal device is arranged outside the annular discharge hopper; the annular discharge hopper comprises an inner bucket wall and an outer bucket wall arranged coaxially, and the annular space between the inner bucket wall and the outer bucket wall is a discharge channel; the iron removal device consists of an annular electromagnet and an iron impurity discharge chute. The present invention arranges an annular iron removal device at the discharge end of the gyratory crusher; according to the characteristics of the annular discharge of the gyratory crusher, an iron removal device consisting of an annular electromagnet and an iron impurity discharge chute is adopted, and the iron removal device is integrated with the discharge hopper of the gyratory crusher, which has a simple structure, low manufacturing cost and good implementation effect.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a ring-shaped iron removal device and method for removing iron and impurities from coarsely crushed ore. Background Art

[0002] Most non-magnetic minerals have fine particle sizes and need to be ground and sorted to obtain high-quality concentrate products. Generally, the maximum particle size of the ore mined from the mine is 600-1200mm, while the feed particle size of the grinding is less than 12mm, so a crushing process is required before grinding.

[0003] Before entering the grinding process, the mined ore usually has to go through three to four stages of continuous crushing to reach the particle size required for grinding. The coarse crusher has a relatively large crushing chamber space due to the large particle size of the feeder discharge, and the various iron objects mixed in the mining site will not cause damage to the coarse crusher. Cone crushers and high-pressure roller mills are usually used for medium and fine crushing. Their crushing chambers are small, and the mixed iron objects can easily cause ore jamming, resulting in crusher overload or even damage to the crushing chamber. Therefore, for the crushers used in medium and fine crushing, it is generally necessary to remove iron before the materials are fed into the crusher.

[0004] The current iron removal method is to hang a disc iron remover or a belt iron remover above the feed belt of the medium and fine crushing crusher after coarse crushing, such as a "mobile jaw crushing station" disclosed in the Chinese invention patent with the authorization announcement number CN111889175B, which includes a feeding device and an iron removal device. The feeding device includes a conveyor frame and a conveyor belt. The conveyor frame is installed on the base with an upward tilt. The lower end of the conveyor belt extends directly below the discharge channel of the jaw crusher. A support frame is installed at the front end of the base. The iron removal device is fixed on the support frame and is located directly above the middle of the conveyor belt. This independent iron removal device has large equipment specifications, occupies a large space, and has high equipment purchase and workshop civil engineering investment.

[0005] The Chinese patent application with application publication number CN112387344A discloses "a cone crusher with iron removal function and its use method". The cone crusher includes a casing, a transmission device, an eccentric sleeve, a fixed cone, a moving cone, an adjustment device and a feeding port. The transmission device is placed on the outside of the casing, the eccentric sleeve is placed inside the casing and is rotatably connected to the transmission device, the fixed cone is connected to the inner wall of the casing, the adjustment device is connected to the outer side of the upper part of the casing, the feeding port is opened at the bottom of the casing, the moving cone is connected to the top of the eccentric sleeve, the upper part of the moving cone and the inside of the casing are surrounded to form a feeding cavity, and the upper part of the moving cone is also connected to an iron removal device. It solves the problem that the existing cone crusher has no iron removal function and is prone to iron overload, resulting in iron parts stuck between the moving and fixed cone linings, causing the crusher to malfunction, especially when the material before entering the crusher has not undergone the iron removal process, so that it is mixed with foreign objects such as iron blocks, and the crusher cannot handle the problem of iron choking alone. The cone crusher is used for medium and fine crushing of ore. The iron removal device is arranged at the feed end, and the structure of the iron removal device is relatively complicated.

[0006] Gyratory crusher is a type of cone crusher, mainly used for coarse crushing. Compared with jaw crusher, the advantage of gyratory crusher is that the crushing process is carried out continuously along the annular crushing chamber, so the productivity is high, the power consumption is low and the operation is stable. The single-machine processing capacity of gyratory crusher is large, the crushing ratio is large, especially for the ore containing a certain amount of water, it can also have a good crushing effect, so it is widely used in large mines, especially open-pit mines. Since the gyratory crusher discharges in an annular circumferential manner, it is impossible to achieve direct distribution of traditional iron removal devices, and there is no precedent for dry separation at the discharge end of the gyratory crusher. Summary of the invention

[0007] The present invention provides an annular iron removal device and method, wherein the iron removal device is arranged at the discharge end of a gyratory crusher; according to the characteristics of the annular discharge of the gyratory crusher, an iron removal device composed of an annular electromagnet and an iron impurity discharge chute is adopted, and the iron removal device is integrated with the discharge hopper of the gyratory crusher, which has a simple structure, low manufacturing cost and good implementation effect.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A ring-shaped iron removal device comprises an annular discharge hopper and an iron removal device arranged below a gyratory crusher; the upper annular opening of the annular discharge hopper is located below the annular discharge port at the bottom of the gyratory crusher; the iron removal device is arranged on the outer side of the annular discharge hopper; the annular discharge hopper comprises an inner hopper wall and an outer hopper wall arranged coaxially, and the annular space between the inner hopper wall and the outer hopper wall is a discharge channel; the iron removal device consists of an annular electromagnet and an iron and impurity discharge chute; an annular opening is arranged on the top of the outer hopper wall of the annular discharge hopper, and the annular electromagnet is arranged on the outer side of the annular opening; the iron and impurity discharge chute is spirally arranged on the outer side of the outer hopper wall, the annular electromagnet is arranged above the iron and impurity discharge chute, and the top of the iron and impurity discharge chute is an open structure.

[0010] Furthermore, a ring-shaped iron removal device also includes a frame; the frame is provided with an upper platform and a lower platform, and the gyratory crusher is fixed on the upper platform through a crusher base; the ring-shaped discharge hopper is fixed on the lower platform through a discharge hopper base, and a ring-shaped through hole is provided at the discharge hopper base corresponding to the discharge channel.

[0011] Furthermore, the gyratory crusher includes a shell, a crushing cone and a driving device; the crushing cone is arranged in the cone cavity of the shell, the driving device is arranged outside the shell, and the driving device is fixed to the upper platform through a driving device base.

[0012] Furthermore, the annular discharge hopper is a conical structure with a small upper opening and a large lower opening, the inner hopper wall and the outer hopper wall are arranged in parallel, and the angle between the inner hopper wall or the outer hopper wall and the horizontal plane is 75° to 85°.

[0013] Furthermore, the upper edge of the outer bucket wall is located outside the outer circumference of the annular discharge port of the gyratory crusher, and the single-side spacing is 50-100mm; the distance between the upper edge of the outer bucket wall and the lower edge of the annular discharge port of the gyratory crusher is 300-500mm; the upper edge of the inner bucket wall is located inside the inner circumference of the annular discharge port of the gyratory crusher, and the single-side spacing is 50-100mm; the distance between the upper edge of the inner bucket wall and the lower edge of the annular discharge port of the gyratory crusher is 50-100mm.

[0014] Furthermore, the single-side distance between the annular electromagnet and the outer bucket wall is 200 to 300 mm, the upper edge of the annular electromagnet is flush with the upper edge of the inner bucket wall, and the lower edge of the annular electromagnet is flush with the upper edge of the outer bucket wall; the cross-section of the iron and debris discharge chute is U-shaped, and the annular electromagnet is connected to the top of the outer plate of the iron and debris discharge chute through a connecting ring plate.

[0015] Furthermore, the iron impurities discharge port at the bottom of the iron impurities discharge chute is 200 to 400 mm higher than the lower edge of the annular discharge hopper.

[0016] Furthermore, a ring-shaped iron removal device also includes a control system; the control end of the ring-shaped electromagnet is connected to the control system.

[0017] A circular iron removal method comprises the following steps: an iron removal device is arranged outside a circular discharge hopper below a gyratory crusher; ore coarsely crushed by the gyratory crusher is discharged from a circular discharge port; a control system controls a circular electromagnet to be energized and de-energized at set intervals, and the current intensity of the circular electromagnet can be adjusted; when the ore passes through the upper part of the circular discharge hopper, the circular electromagnet is energized to generate a magnetic field to adsorb iron impurities in the ore, and the ore after iron impurities are removed is discharged from the bottom of the circular discharge hopper; when the circular electromagnet is de-energized, the iron impurities adsorbed on the circular electromagnet fall into an iron impurity discharge chute below and are discharged from the iron impurity discharge port.

[0018] Furthermore, the magnetic field strength of the annular electromagnet is 10-100 mT; the interval time is set to be power-off once every 0.5-2 hours, the power-off time is 0.5-1.5 minutes, and the rest of the time is powered on.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The present invention integrates the gyratory crusher, the annular discharge hopper and the iron removal device into one. The two functions of gyratory crushing and iron removal are integrated into one device. After the crushed stone enters the secondary crusher, there is no need to set up an independent iron removal device. In addition, the iron removal device is small in size, simple in structure, low in manufacturing cost, and occupies little space, which can reduce the equipment purchase cost and workshop construction investment;

[0021] 2) An iron removal device is arranged below the annular discharge port of the gyratory crusher. The annular electromagnet in the iron removal device is arranged circumferentially outside the annular material flow of the gyratory crusher, making full use of the large discharge area and thin material layer of the annular discharge of the gyratory crusher, so that the magnetic field of the annular electromagnet can penetrate the entire material layer without significant attenuation, thereby ensuring the complete adsorption of iron impurities in the ore, thoroughly removing iron, and effectively protecting the subsequent medium and fine crushers, so that the medium and fine crushers will not be damaged due to excessive iron;

[0022] 3) The annular electromagnet is arranged on the periphery of the annular discharge hopper, which ensures that the annular electromagnet is not impacted by the material flow and avoids wear; the magnetic field strength is 10-100mT, which can ensure strong adsorption of iron impurities and thorough impurity removal;

[0023] 4) The control end of the annular electromagnet is connected to the control system, and the power is turned on and off according to the set interval time. This interval working mode ensures that the adsorbed iron impurities can be removed in time. Since the power-off time is very short, the leakage of iron impurities during the power-off period is reduced to the greatest extent;

[0024] 5) The current intensity of the annular electromagnet is adjustable, that is, the magnetic field intensity is adjustable. The optimal adsorption field intensity can be adjusted according to the changes in the material to optimize the iron removal effect;

[0025] 6) The power on and off and current intensity adjustment of the annular electromagnet are all controlled by the control system, with a high degree of automation;

[0026] 7) The iron impurities discharge chute is a spiral chute. The iron impurities that fall from the annular electromagnet into the iron impurities discharge chute go down along the spiral channel under the action of gravity until they are discharged. The discharge of iron impurities is simple and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a ring-shaped iron removal device described in the present invention.

[0028] In the figure: 1. Annular discharge hopper 2. Frame 3. Shell 4. Crushing cone 5. Drive device 6. Drive device base 7. Crusher base 8. Outer bucket wall 9. Inner bucket wall 10. Discharge hopper base 11. Upper platform 12. Lower platform 13. Annular electromagnet 14. Iron and steel discharge chute 15. Connecting ring plate 16. Iron and steel discharge port DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0030] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0032] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0033] like Figure 1As shown, the annular iron removal device described in the present invention includes an annular discharge hopper 1 and an iron removal device arranged below a gyratory crusher; the upper annular opening of the annular discharge hopper 1 is located below the annular discharge port at the bottom of the gyratory crusher; an iron removal device is arranged on the outer side of the annular discharge hopper 1; the annular discharge hopper 1 includes an inner bucket wall 9 and an outer bucket wall 8 arranged coaxially, and the annular space between the inner bucket wall 9 and the outer bucket wall 8 is a discharge channel; the iron removal device is composed of an annular electromagnet 13 and an iron impurity discharge chute 14; an annular opening is arranged on the top of the outer bucket wall 8 of the annular discharge hopper 1, and the annular electromagnet 13 is arranged on the outer side of the annular opening; the iron impurity discharge chute 14 is spirally arranged on the outer side of the outer bucket wall 8, the annular electromagnet 13 is arranged above the iron impurity discharge chute 14, and the top of the iron impurity discharge chute 14 is an open structure.

[0034] Furthermore, a ring-shaped iron removal device also includes a frame 2; the frame 2 is provided with an upper platform 11 and a lower platform 12, and the gyratory crusher is fixed on the upper platform 11 through a crusher base 7; the ring-shaped discharge hopper 1 is fixed on the lower platform 12 through a discharge hopper base 10, and the discharge hopper base 10 is provided with a ring-shaped through hole corresponding to the discharge channel.

[0035] Furthermore, the gyratory crusher includes a shell 3, a crushing cone 4 and a driving device 5; the crushing cone 4 is arranged in the cone cavity of the shell 3, the driving device 5 is arranged outside the shell 3, and the driving device 5 is fixed to the upper platform 11 through the driving device base 6.

[0036] Furthermore, the annular discharge hopper 1 is a conical structure with a small upper opening and a large lower opening, the inner hopper wall 9 and the outer hopper wall 8 are arranged in parallel, and the angle between the inner hopper wall 9 or the outer hopper wall 8 and the horizontal plane is 75° to 85°.

[0037] Furthermore, the upper edge of the outer bucket wall 8 is located outside the outer circumference of the annular discharge port of the gyratory crusher, and the single-side spacing is 50-100mm; the distance between the upper edge of the outer bucket wall 8 and the lower edge of the annular discharge port of the gyratory crusher is 300-500mm; the upper edge of the inner bucket wall 9 is located inside the inner circumference of the annular discharge port of the gyratory crusher, and the single-side spacing is 50-100mm; the distance between the upper edge of the inner bucket wall 9 and the lower edge of the annular discharge port of the gyratory crusher is 50-100mm.

[0038] Furthermore, the single-side distance between the annular electromagnet 13 and the outer bucket wall 8 is 200 to 300 mm, the upper edge of the annular electromagnet 13 is flush with the upper edge of the inner bucket wall 9, and the lower edge of the annular electromagnet 13 is flush with the upper edge of the outer bucket wall 8; the cross-section of the iron and debris discharge chute 14 is U-shaped, and the annular electromagnet 13 is connected to the top of the outer plate of the iron and debris discharge chute 14 through a connecting ring plate 15.

[0039] Furthermore, the iron impurities discharge port 16 at the bottom of the iron impurities discharge chute 14 is 200 to 400 mm higher than the lower edge of the annular discharge hopper 1 .

[0040] Furthermore, the annular iron removal device described in the present invention also includes a control system; the control end of the annular electromagnet 13 is connected to the control system.

[0041] The present invention discloses a circular iron removal method, in which an iron removal device is arranged outside a circular discharge hopper 1 below a gyratory crusher; ore coarsely crushed by the gyratory crusher is discharged from a circular discharge port; a control system controls a circular electromagnet 13 to be energized and de-energized at set intervals, and can adjust the current intensity of the circular electromagnet 13; when the ore passes through the upper part of the circular discharge hopper 1, the circular electromagnet 13 is energized to generate a magnetic field to adsorb iron impurities in the ore, and the ore after iron impurities are removed is discharged from the bottom of the circular discharge hopper 1; when the circular electromagnet 13 is de-energized, the iron impurities adsorbed on the circular electromagnet 13 fall into an iron impurity discharge chute 14 below, and are discharged from an iron impurity discharge port 16.

[0042] Furthermore, the magnetic field strength of the annular electromagnet 13 is 10-100 mT; the interval time is set to be power-off once every 0.5-2 hours, the power-off time is 0.5-1.5 minutes, and the rest of the time is powered on.

[0043] In order to make the purpose, technical scheme and technical effect of the embodiment of the present invention clearer, the technical scheme in the embodiment of the present invention is now clearly and completely described. However, the embodiment described below is only a part of the embodiment of the present invention, not all of the embodiments. In combination with the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] [Example]

[0045] In this embodiment, the annular iron removal device includes an annular discharge hopper 1, an iron removal device and a frame 2. The gyratory crusher is a conventional structure, mainly composed of a shell 3, a crushing cone 4 and a driving device 5, and the driving device base, the crusher base 7 and the upper platform 11 of the frame 2 are fixedly connected by bolts.

[0046] The annular discharge hopper 1 is arranged below the annular discharge port at the bottom of the gyratory crusher. The annular discharge hopper 1 is a conical hopper with a small upper opening and a large lower opening. The annular space between the inner hopper wall 9 and the outer hopper wall 8 is a discharge channel; the inclination angle of the inner hopper wall 9 (the angle between the horizontal plane) and the inclination angle of the outer hopper wall 8 (the angle between the horizontal plane) are both 80°.

[0047] The upper edge of the outer bucket wall 8 of the annular discharge hopper 1 is located outside the outer circumference of the annular discharge port of the gyratory crusher, with a single-side distance of 80 mm, and the upper edge of the outer bucket wall 8 is 400 mm away from the lower edge of the annular discharge port of the gyratory crusher.

[0048] The upper edge of the inner bucket wall 9 of the annular discharge hopper 1 is located inside the inner circumference of the annular discharge port of the gyratory crusher, with a single-side distance of 80 mm, and the upper edge of the inner bucket wall 9 is 70 mm away from the lower edge of the annular discharge port of the gyratory crusher. The annular discharge hopper 1 is fixedly connected to the lower platform 12 of the frame 2 through a discharge hopper base 10 provided at the bottom by bolts, and an annular through hole is provided on the discharge hopper base 10 corresponding to the discharge channel.

[0049] The iron removal device is composed of an annular electromagnet 13 and an iron impurity discharge chute 14. The iron impurity discharge chute 14 is welded and fixed to the outer bucket wall 8 of the annular discharge hopper 2. The cross section of the iron impurity discharge chute 14 is U-shaped. The iron impurity discharge chute 14 is spirally arranged on the outer side of the outer bucket wall 8, and the iron impurity discharge port 16 at the lower end is 300mm away from the lower edge of the outer bucket wall.

[0050] The annular electromagnet 13 is arranged on the periphery of the outer bucket wall 8, with a single side distance of 200mm, the upper edge of the annular electromagnet 13 is flush with the upper edge of the inner bucket wall 9, and the lower edge of the annular electromagnet 13 is flush with the upper edge of the outer bucket wall 8, with a height of 330mm. The annular electromagnet 13 is connected to the top of the outer plate of the iron impurity discharge chute 14 through a connecting ring plate 15.

[0051] The magnetic field strength of the annular electromagnet 13 is adjustable from 10 to 100 mT. The control end of the annular electromagnet 13 is connected to the control system. The control system controls the electromagnetic coil to be powered on and off at a set interval time, and can adjust the current intensity of the annular electromagnet. In this embodiment, the interval time is set to power off once every 1 hour, the power off time is 1 minute, and the rest of the time is powered on.

Claims

1. A ring-shaped iron removal device, characterized in that: It includes an annular discharge hopper and an iron removal device arranged below a gyratory crusher; the upper annular opening of the annular discharge hopper is located below the annular discharge port at the bottom of the gyratory crusher; an iron removal device is arranged on the outer side of the annular discharge hopper; the annular discharge hopper includes an inner bucket wall and an outer bucket wall arranged coaxially, and the annular space between the inner bucket wall and the outer bucket wall is a discharge channel; the iron removal device consists of an annular electromagnet and an iron and impurity discharge chute; an annular opening is arranged on the top of the outer bucket wall of the annular discharge hopper, and the annular electromagnet is arranged on the outer side of the annular opening; the iron and impurity discharge chute is spirally arranged on the outer side of the outer bucket wall, the annular electromagnet is arranged above the iron and impurity discharge chute, and the top of the iron and impurity discharge chute is an open structure.

2. A ring-shaped iron removal device according to claim 1, characterized in that: It also includes a frame; the frame is provided with an upper platform and a lower platform, the gyratory crusher is fixed on the upper platform through a crusher base; the annular discharge hopper is fixed on the lower platform through a discharge hopper base, and an annular through hole is provided at the discharge hopper base corresponding to the discharge channel.

3. The annular iron removal device according to claim 1, characterized in that: The gyratory crusher comprises a shell, a crushing cone and a driving device; the crushing cone is arranged in a cone cavity of the shell, the driving device is arranged outside the shell, and the driving device is fixed on the upper platform through a driving device base.

4. The annular iron removal device according to claim 1, characterized in that: The annular discharge hopper is a conical structure with a small upper opening and a large lower opening. The inner hopper wall and the outer hopper wall are arranged in parallel, and the angle between the inner hopper wall or the outer hopper wall and the horizontal plane is 75° to 85°.

5. The annular iron removal device according to claim 1, characterized in that: The upper edge of the outer bucket wall is located outside the outer circumference of the annular discharge port of the gyratory crusher, and the single-side spacing is 50-100mm; the distance between the upper edge of the outer bucket wall and the lower edge of the annular discharge port of the gyratory crusher is 300-500mm; the upper edge of the inner bucket wall is located inside the inner circumference of the annular discharge port of the gyratory crusher, and the single-side spacing is 50-100mm; the distance between the upper edge of the inner bucket wall and the lower edge of the annular discharge port of the gyratory crusher is 50-100mm.

6. The annular iron removal device according to claim 1, characterized in that: The single-side distance between the annular electromagnet and the outer bucket wall is 200-300 mm, the upper edge of the annular electromagnet is flush with the upper edge of the inner bucket wall, and the lower edge of the annular electromagnet is flush with the upper edge of the outer bucket wall; the cross-section of the iron and debris discharge chute is U-shaped, and the annular electromagnet is connected to the top of the outer plate of the iron and debris discharge chute through a connecting ring plate.

7. The annular iron removal device according to claim 1, characterized in that: The iron impurities discharge port at the bottom end of the iron impurities discharge chute is 200 to 400 mm higher than the lower edge of the annular discharge hopper.

8. The annular iron removal device according to claim 1, characterized in that: It also includes a control system; the control end of the annular electromagnet is connected to the control system.

9. A circular iron removal method based on the device according to any one of claims 1 to 8, characterized in that: An iron removal device is arranged on the outer side of the annular discharge hopper below the gyratory crusher; the ore after coarse crushing by the gyratory crusher is discharged from the annular discharge port; the control system controls the annular electromagnet to be energized and de-energized at set intervals, and can adjust the current intensity of the annular electromagnet; when the ore passes through the upper part of the annular discharge hopper, the annular electromagnet is energized to generate a magnetic field to adsorb the iron impurities in the ore, and the ore after the iron impurities are removed is discharged from the bottom of the annular discharge hopper; when the annular electromagnet is de-energized, the iron impurities adsorbed on the annular electromagnet fall into the iron impurity discharge chute below and are discharged from the iron impurity discharge port.

10. A circular iron removal method according to claim 9, characterized in that: The magnetic field strength of the annular electromagnet is 10-100 mT; the interval time is set to power off once every 0.5-2 hours, the power off time is 0.5-1.5 minutes, and the rest of the time is powered on.

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