Inverted cone magnetic separator

Abstract

The invention discloses an inverted cone magnetic separator, belonging to the technical field of mineral processing equipment. The inverted cone magnetic separator comprises a conical outer sleeve (1), a conical inner sleeve (3), a feed pipe (5) and a pulp washing water pipe (4). The large end of the conical outer sleeve (1) is upward and fixedly arranged, and the conical inner sleeve (3) is arranged inside the conical outer sleeve (1) and can rotate horizontally; the feed pipe (5) and the pulp washing water pipe (4) are arranged above the conical inner sleeve (3), and a receiving plate (8) is arranged radially at the outlet of the lower end of the conical outer sleeve (1). A plurality of magnet blocks (2) are arranged at intervals on the outer wall of the conical outer sleeve (1), and the magnet blocks (2) are located below the feed pipe (5). The device introduces centrifugal force in weak magnetic separation, and can be produced continuously, while separating and discharging, thereby improving the recovery rate of small-particle magnetic minerals. The device solves the problem that the existing magnetic drum type magnetic separator has a large impact on the drum, resulting in the inability of small-particle magnetic core minerals to be adsorbed on the drum surface, resulting in a low recovery rate.

Description

Technical Field

[0001] The invention discloses an inverted cone magnetic separator and belongs to the technical field of ore dressing equipment. Background Art

[0002] Iron ore resources are abundant and widely distributed in the world. The iron ore deposits discovered so far are mainly distributed in North America, the east coast of South America, Australia, Russia, Canada, China, Brazil and other regions. Among them, Australia ranks first, Canada ranks second, Russia ranks third, and Brazil ranks fourth.

[0003] my country's iron ore resources are spread all over the country. Among my country's iron ore resources, lean ores account for about 94.6% of the total reserves, and these lean ores can only be used after beneficiation. The composition of iron ore is relatively complex. For example, iron ore contains symbiotic components such as vanadium, titanium, and cobalt. There are a large number of metal oxides such as silicates, silicon oxides, magnesium and aluminum in iron ore. If these impurities cannot be removed during magnetic separation, it will directly affect the quality of iron concentrate, and it will be difficult to obtain high-quality iron concentrate with low iron grade and low impurities.

[0004] The existing magnetic separation mainly uses a cylindrical magnetic separator for magnetite separation, magnetic weighting medium recovery and preparation for wet strong magnetic separation. Its main structure: cylinder, magnetic system, separation tank and feeding, discharging and overflow mechanism. The small cylinder diameter is a 3-pole magnetic system, and the large cylinder diameter greater than 750mm uses a 4-pole to 6-pole magnetic system. The polarity alternates along the peripheral direction and is the same along the axial direction; the magnetic system wrap angle is 106~135°. The magnetic system uses strontium ferrite permanent magnets, which can produce the highest magnetic field intensity under given special magnetic field distribution conditions. The tank body working in the magnetic field is made of austenitic stainless steel, and the surface is made of synthetic wear-resistant rubber to prevent wear.

[0005] According to the different tank structures, there are three types of tank structures for wet drum magnetic separators: downstream, countercurrent and semi-countercurrent.

[0006] The feed slurry of the drum magnetic separator enters the separation space from the bottom of the tank in a loose suspension state. The direction of the slurry movement is basically the same as the direction of the magnetic field force, so the ore particles can reach the surface of the drum with a high magnetic field force. In addition, the tailings are discharged from the tailings holes on the bottom plate, so that the height of the overflow surface can maintain the level of the slurry in the tank. The above two characteristics determine that the semi-countercurrent magnetic separator can obtain higher concentrate quality and metal recovery rate. Therefore, it is widely used in the roughing and concentrating operations of strong magnetic ores with fine particles less than 0.2mm. This type of magnetic separator can be used in series to improve the grade of the concentrate.

[0007] Its disadvantages: the ore pulp impacts the cylinder surface, and then is adsorbed on the cylinder surface under the action of magnetic force. However, if the impact force is too large or too small, small particles of magnetic minerals will be washed down or fail to contact the cylinder surface. This will lead to a large loss of recovery rate and a large amount of gangue inclusions that affect the grade of iron ore concentrate.

[0008] The domestic patent (application number: 201721602717.9) discloses a centrifugal concentrator, which fixes the magnetic material on the rotating shaft through a mesh slot, and the magnetic material mainly absorbs magnetic impurities to increase the concentrate content. Summary of the invention

[0009] The technical problem to be solved by the present invention is that the existing magnetic drum type magnetic separator has a large impact on the drum body, which causes small particles of magnetic minerals to be unable to be adsorbed on the surface of the drum body, resulting in a low recovery rate.

[0010] The technical solution adopted by the present invention to solve its technical problems is: an inverted cone magnetic separator, including a conical outer sleeve, a conical inner sleeve, a feed pipe and a slurry flushing water pipe, the large end of the conical outer sleeve is upward and fixed, the conical inner sleeve is arranged at intervals on the inner side of the conical outer sleeve, and the conical inner sleeve can rotate horizontally; the feed pipe and the slurry flushing water pipe are arranged above the conical inner sleeve, an ore receiving plate is radially arranged at the outlet of the lower end of the conical outer sleeve, and a plurality of magnet blocks are arranged at intervals on the outer side wall of the conical outer sleeve, and the magnet blocks are located below the feed pipe.

[0011] Wherein, the cone angle of the conical inner sleeve in the above device is 5 to 180°.

[0012] The above device also includes a concentrate flushing pipe, which is arranged above the conical inner sleeve and is located on the opposite side of the slurry flushing water pipe.

[0013] Furthermore, the concentrate washing pipe in the above device is an arc-shaped pipe structure, and a plurality of through holes are arranged at intervals on the pipe wall, and the outlets of the through holes face the inner wall of the conical inner sleeve on the same side.

[0014] Wherein, the ore receiving plate in the above device is slidably connected to the inner wall of the lower end outlet of the conical outer casing.

[0015] The slurry flushing water pipe in the above device is an arc-shaped pipe structure, and a plurality of through holes are arranged at intervals on the pipe wall, and the outlets of the through holes face the inner wall of the conical inner sleeve on the same side.

[0016] Wherein, the inner wall of the conical inner sleeve in the above device is a concave-convex surface structure.

[0017] Furthermore, in the above device, grooves with a spiral structure are arranged at intervals on the inner wall of the conical inner sleeve.

[0018] Furthermore, in the above device, the depth of the grooves on the inner wall of the conical inner sleeve decreases from top to bottom.

[0019] The device further comprises a rotating driving member, and a rotating connecting member is arranged at the upper end of the conical inner sleeve, and the rotating driving member is connected to the rotating connecting member so that the rotating driving member drives the conical inner sleeve to rotate.

[0020] The beneficial effects of the present invention are as follows: the present device has a simple structure, few moving parts, stable operation, and low energy consumption. In particular, centrifugal force is introduced in weak magnetic separation, and continuous production is possible, while ore is sorted and discharged, which greatly improves the magnetic separation efficiency and the recovery rate of small-particle minerals. Under the same processing capacity, it has a better contact surface between the ore pulp and the magnetic force than the drum magnetic separator and the cone concentrator, so that the magnetic minerals caught by the magnetic force in the magnetic separation can obtain more tumbling actions, reduce the inclusion of gangue, and improve the grade of iron ore concentrate. When sorting specific minerals, inclined straight lines or circular grooves of a certain depth can also be added to the surface of the cone according to the difference in specific gravity between the mineral and the gangue, so as to increase the tumbling degree of the mineral and the gangue mineral, thereby improving the mineral enrichment ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention.

[0022] Figure 2 The present invention is provided with a schematic diagram of the structure of a rotating drive member.

[0023] Figure 3 It is a schematic diagram of the top view structure of the present invention.

[0024] Marked in the figure are: 1 is the outer cone sleeve, 2 is the magnet block, 3 is the inner cone sleeve, 4 is the slurry flushing water pipe, 5 is the ore feeding pipe, 6 is the concentrate flushing pipe, 7 is the rotating connecting part, 8 is the ore receiving plate, and 9 is the rotating driving part. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings.

[0026] like Figures 1 to 3As shown, the inverted cone magnetic separator of the present invention comprises a conical outer sleeve 1, a conical inner sleeve 3, a feed pipe 5 and a slurry flushing water pipe 4, wherein the large end of the conical outer sleeve 1 is upward and fixedly arranged, the conical inner sleeve 3 is arranged at intervals inside the conical outer sleeve 1, and the conical inner sleeve 3 can rotate horizontally; the feed pipe 5 and the slurry flushing water pipe 4 are arranged above the conical inner sleeve 3, and a receiving plate 8 is arranged radially at the outlet of the lower end of the conical outer sleeve 1, and a plurality of magnet blocks 2 are arranged at intervals on the outer wall of the conical outer sleeve 1, and the magnet blocks 2 are located below the feed pipe 5. It can be understood by those skilled in the art that the present device mainly comprises a conical outer sleeve 1, a conical inner sleeve 3, a feed pipe 5 and a slurry flushing water pipe 4, and the large end of the conical outer sleeve 1 is actually upward and fixedly arranged to keep the conical outer sleeve 1 fixed. The conical inner sleeve 3 is arranged at intervals inside the conical outer sleeve 1, and the conical inner sleeve 3 can rotate horizontally, and the conical inner sleeve 3 can actually be supported by a frame to be rotatably connected to the frame, and the conical inner sleeve 3 can be driven to rotate by a motor and a belt. The feed pipe 5 and the slurry flushing water pipe 4 are arranged above the conical inner sleeve 3, mainly for feeding and realizing the tumbling of the minerals. A receiving plate 8 is arranged radially at the outlet of the lower end of the conical outer sleeve 1, so that the receiving plate 8 divides the outlet into a concentrate outlet and a tailings outlet. Preferably, the receiving plate 8 is arranged vertically to the axis space of the feed pipe 5, the side close to the feed pipe 5 is the tailings outlet, and the side close to the concentrate flushing pipe 6 is the concentrate outlet. Preferably, a plurality of magnet blocks 2 are arranged at intervals on the outer wall of the conical outer sleeve 1, and the magnet blocks 2 are located below the feed pipe 5. The adsorption of minerals is realized by the magnet blocks 2. In fact, since there are multiple magnet blocks 2, they are arranged in sheets, and the feed pipe 5 is a tubular structure. Preferably, the magnet blocks 2 are located on the inner wall of the receiving plate 8 close to the feed pipe 5, and are located directly below it. The actual screening of this device is to feed the ground slurry of a certain concentration into the inner wall of the left side of the upper cone inner sleeve 3 through the ore feeding pipe 5, and then feed the spray flushing water through the slurry flushing water pipe 4. Since the cone inner sleeve 3 has a certain inclination, under the combined action of centrifugal force, gravity, magnetism and flushing water, the minerals and gangue in the slurry roll down along the cone, and continue to roll under the push of the subsequent slurry. Due to the difference in specific gravity and magnetism, the magnetic minerals gradually stick to the inner wall of the cone inner sleeve 3 during the rolling, and resist the impact of the subsequent slurry under the action of friction and adhere to the inner wall of the cone inner sleeve 3. Under the rotation of the cone inner sleeve 3, it is separated from the magnetic field on the surface of the cone outer sleeve 1 and is taken to the right side to be discharged as concentrate; while the gangue minerals with smaller specific gravity and smaller magnetism are easier to be washed down by the flushing water due to the small friction between the gangue mineral layer and the mineral layer, and the magnetic force is also small, and finally they are impacted by the subsequent slurry to the tailings tank and discharged as tailings.

[0027] Preferably, the cone angle of the conical inner sleeve 3 in the above device is 5 to 180°. Those skilled in the art will appreciate that the cone angle of the conical inner sleeve 3 of the device is preferably 5 to 180°, so as to control the force component of the slurry on the side wall of the conical outer sleeve 1 and control the falling speed of the slurry. In practice, the cone angle of the conical outer sleeve 3 can be preferably 30 to 150°.

[0028] Preferably, the above device further includes a concentrate flushing pipe 6, which is arranged above the conical inner sleeve 3 and located opposite to the slurry flushing water pipe 4. Those skilled in the art can understand that the function of the concentrate flushing pipe 6 is mainly to separate and screen the concentrate from the side wall of the conical inner sleeve 3 through flushing water. Therefore, in order to facilitate the discharge of the concentrate, the present device preferably arranges the concentrate flushing pipe 6 on the opposite side of the slurry flushing water pipe 4, so that the flushing water from the concentrate flushing pipe 6 directly acts on the concentrate on the surface of the conical inner sleeve 3, and the concentrate is discharged under the action of centrifugal force.

[0029] Preferably, the concentrate washing pipe 6 in the above device is an arc-shaped pipe structure, and a plurality of through holes are arranged at intervals on the pipe wall, and the outlets of the through holes face the inner wall of the conical inner sleeve 3 on the same side. It can be understood by those skilled in the art that the present device is only further preferred that the concentrate washing pipe 6 is an arc-shaped pipe structure, and a plurality of through holes are arranged at intervals on the pipe wall of the concentrate washing pipe 6, and the outlets of the through holes face the inner wall of the conical inner sleeve 3 on the same side, so as to realize the washing and screening of the slurry, make the washing water inlet more uniform, and avoid the washing water directly impacting the slurry and causing the concentrate to fall into the tailings port.

[0030] Preferably, the receiving plate 8 in the above device is slidably connected to the inner wall at the lower outlet of the conical outer casing 1. Those skilled in the art can understand that, in order to facilitate the adjustment of the yield of concentrate and tailings, the receiving plate 8 of the device is preferably slidably connected to the inner wall at the lower outlet of the conical outer casing 1, and the receiving plate 8 can actually be moved to different positions to control the size of the concentrate outlet and the tailings outlet.

[0031] Preferably, the slurry flushing water pipe 4 in the above device is an arc-shaped pipe structure, and a plurality of through holes are arranged at intervals on the pipe wall, and the through hole outlets face the inner wall of the conical inner sleeve 3 on the same side. It can be understood by those skilled in the art that, in order to make the flushing water more uniform, the slurry flushing water pipe 4 is preferably set as an arc-shaped pipe structure, and a plurality of through holes are arranged at intervals on the pipe wall, and the through hole outlets face the inner wall of the conical inner sleeve 3 on the same side.

[0032] Preferably, the inner wall of the conical inner sleeve 3 in the above device is a concave-convex surface structure. It can be understood by those skilled in the art that since the slurry directly contacts the side wall of the conical inner sleeve 3, it will slide down along the side wall. In order to increase the friction force, the device preferably has a concave-convex surface structure on the inner wall of the conical inner sleeve 3. In practice, the purpose of the concave-convex surface of the inner wall of the conical inner sleeve 3 can be achieved by spraying paint.

[0033] Preferably, the inner wall of the conical inner sleeve 3 in the above device is provided with grooves of a spiral structure at intervals. It can be understood by those skilled in the art that in order to increase the friction between the mineral and the conical inner sleeve 3, to achieve the screening of small-particle minerals, and to improve the tumbling degree of minerals and gangue minerals, the device preferably has grooves of a spiral structure at intervals on the inner wall of the conical inner sleeve 3.

[0034] Preferably, the depth of the groove on the inner wall of the conical inner sleeve 3 in the above device decreases from top to bottom. It can be understood by those skilled in the art that the main function of the groove is to increase the friction between the concentrate and the conical inner sleeve 3, so part of the concentrate will be stored in the groove, and the concentrate can fall from top to bottom along the groove under the action of gravity. In fact, in order to facilitate the flushing water to take out the concentrate, the device preferably decreases the depth of the groove 8 from top to bottom to facilitate the discharge of the concentrate.

[0035] Preferably, the above device further includes a rotating driving member 9, and a rotating connecting member 7 is provided at the upper end of the conical inner sleeve 3, and the rotating driving member 9 is connected to the rotating connecting member 7, so that the rotating driving member 9 drives the conical inner sleeve 3 to rotate. It can be understood by those skilled in the art that, in order to facilitate the driving of the conical inner sleeve 3, the present device preferably also includes a rotating driving member 9, and the rotating connecting member 7 is actually provided at the upper end of the conical inner sleeve 3, and the conical inner sleeve 3 can be rotatably set on the frame at the same time, so that the conical inner sleeve 3 can rotate in the horizontal direction, and the rotating driving member 9 is connected to the rotating connecting member 7, so that the rotating driving member 9 drives the conical inner sleeve 3 to rotate, and the rotating driving member 9 can be preferably a motor with a reducer, and the rotating connecting member 7 is a pulley, and the two are connected by a belt to realize the rotation of the conical inner sleeve 3.

Claims

1. Inverted cone magnetic separator, characterized by: The invention comprises a conical outer sleeve (1), a conical inner sleeve (3), a feed pipe (5) and a slurry flushing water pipe (4); the large end of the conical outer sleeve (1) is upwardly directed and fixedly arranged; the conical inner sleeve (3) is arranged at intervals on the inner side of the conical outer sleeve (1); and the conical inner sleeve (3) can rotate horizontally; the feed pipe (5) and the slurry flushing water pipe (4) are arranged above the conical inner sleeve (3); an ore receiving plate (8) is arranged radially at the outlet of the lower end of the conical outer sleeve (1); a plurality of magnet blocks (2) are arranged at intervals on the outer wall of the conical outer sleeve (1); and the magnet blocks (2) are located at the inner side of the conical outer sleeve (1). The conical inner sleeve (3) is provided with a concave-convex surface structure on its inner wall; and further comprises a concentrate flushing pipe (6), which is arranged above the conical inner sleeve (3) and is located on the opposite side of the slurry flushing water pipe (4); the concentrate flushing pipe (6) is an arc-shaped pipe structure, and a plurality of through holes are arranged at intervals on the pipe wall, and the outlets of the through holes face the inner wall of the conical inner sleeve (3) on the same side; the inner wall of the conical inner sleeve (3) is provided with grooves of a spiral structure at intervals; the depth of the grooves on the inner wall of the conical inner sleeve (3) decreases from top to bottom.

2. The inverted cone magnetic separator according to claim 1, characterized in that: The cone angle of the conical inner sleeve (3) is 5 to 180 degrees.

3. The inverted cone magnetic separator according to claim 1, characterized in that: The ore receiving plate (8) is slidably connected to the inner wall of the lower outlet of the conical outer casing (1).

4. The inverted cone magnetic separator according to claim 1, characterized in that: The slurry flushing water pipe (4) is an arc-shaped pipe structure, and a plurality of through holes are arranged at intervals on the pipe wall, and the outlets of the through holes face the inner wall of the conical inner sleeve (3) on the same side.

5. The inverted cone magnetic separator according to claim 1, characterized in that: It also comprises a rotating driving member (9), and a rotating connecting member (7) is arranged at the upper end of the conical inner sleeve (3). The rotating driving member (9) is connected to the rotating connecting member (7), so that the rotating driving member (9) drives the conical inner sleeve (3) to rotate.

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