Equipment and method for recovering ilmenite in vanadium titano-magnetite through magnetic-gravity combination

Abstract

The invention discloses equipment for recovering ilmenite in vanadium titano-magnetite through magnetic-gravity combination. The equipment comprises a slope separation device, a vertical pipe body device, an ore feeding and magnetic-gravity combination separation device, a vertical sedimentation separation section device, a fluidizer, a concentrate discharging device and a tailing discharging device. Magnets are arranged on the inner wall of the ore feeding and magnetic-gravity combined separation device, the slope separation device comprises a slope pipeline and an inclined plate, low-density gangue minerals large in relative particle size are in a suspended state, continue to move upwards on the inclined plate and are conveyed to the tailing discharging device, and high-density ilmenite small in relative particle size is settled on the surface of the inclined plate and slides downwards. And the concentration of the ilmenite in the vertical pipe body device is increased, so that the ilmenite diffuses downwards and is discharged from the lower part, the treatment process is simple, the treatment efficiency is high, the separation precision of the ilmenite can be improved, the TiO2 grade can be improved, and the separation cost of the ilmenite can be reduced. The invention further discloses a method for recovering the ilmenite in the vanadium titano-magnetite through magnetic-gravity combination.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing equipment technology, and in particular relates to a device and method for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite. Background Technology

[0002] Vanadium-titanium magnetite is a complex mineral resource containing multiple valuable components such as iron, vanadium, and titanium, and contains valuable elements such as iron, titanium, sulfur, and cobalt, possessing extremely high comprehensive utilization value. Ilmenite in vanadium-titanium magnetite is mainly hosted in the valuable mineral ilmenite. The low content of valuable components and complex mineral composition of vanadium-titanium magnetite ore make iron and titanium extraction difficult. Currently, high-gradient magnetic separation-flotation technology is used for ilmenite recovery. However, because ilmenite in vanadium-titanium magnetite has similar specific magnetic susceptibility to gangue minerals such as olivine and pyroxene, they are difficult to effectively separate using high-gradient magnetic separation. This results in low TiO2 grade in the titanium concentrate obtained from high-gradient magnetic separation, leading to large reagent consumption in subsequent separation and flotation, significant environmental pollution, and high production costs. It should be noted that specific magnetic susceptibility represents the ratio of the additional magnetic induction intensity produced by a unit volume of material after being magnetized in an external magnetic field to the intensity of the external magnetic field; it reflects the magnetic strength of the material. When recovering ilmenite using conventional gravity separation equipment, it is difficult to simultaneously achieve both processing efficiency and separation accuracy. Hydrocyclones are relatively simple in structure and have a small footprint, but their separation accuracy is low and they produce a lot of mismatched materials. Liquid-solid fluidized beds are easy to operate and have a large throughput, but their control parameters are not clearly defined. Spiral separators have the advantage of low power consumption, but their separation efficiency is also relatively low. Shaking tables have relatively high separation accuracy, but their processing efficiency is relatively low. Therefore, conventional gravity separation methods are not suitable for the separation and recovery of ilmenite from vanadium-titanium magnetite. None of them can improve the separation accuracy of ilmenite, increase the grade of TiO2, and reduce the separation cost while maintaining a simple processing flow and high processing efficiency. Therefore, it is urgent to solve this problem. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides an apparatus and method for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite. This method improves the sorting accuracy of ilmenite, increases the grade of TiO2, and reduces the cost of ilmenite sorting while maintaining a simple and efficient processing flow.

[0004] The present invention provides a device for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, comprising, from top to bottom, a slope separation device, a vertical pipe device, a feed and combined magnetic and gravity separation device, a vertical settling separation section device, a fluidizer, and a concentrate discharge device.

[0005] The top of the inclined plane sorting device is equipped with a tailings removal device.

[0006] The inner wall of the feeding and magnetic-gravity combined separation device is distributed with magnets, and includes a feeding pipe and a secondary fluidized water supply pipe located below the feeding pipe. The secondary fluidized water supply pipe is used to feed in secondary fluidized water and make the secondary fluidized water flow towards the inclined separation device until it flows out from the tailings discharge device.

[0007] The minerals fed into the feed pipe move upward under the upward thrust of the secondary fluidized water and enter the inclined plane sorting device;

[0008] The inclined plane separation device includes an inclined pipe and inclined plates with a preset spacing disposed therein. Relatively large low-density gangue minerals are suspended and continue to move upwards on the inclined plates and are conveyed to the tailings discharge device. Relatively small high-density ilmenite settles on the surface of the inclined plates and slides downwards, returning to the vertical pipe device. The concentration of ilmenite in the vertical pipe device gradually increases. When a preset concentration is reached, the ilmenite diffuses downwards to the low-flow-velocity area below the feed pipe. Under the combined action of gravity and magnetism, the ilmenite passes through the feed and magnetic-gravity combined separation device and continues to move downwards to the vertical settling separation section device, finally being discharged below the fluidizer and concentrate discharge device. Meanwhile, the relatively large low-density gangue minerals mixed in are pushed upwards by the secondary fluidized water and enter the inclined plane separation device, finally exiting from the tailings discharge device, thus achieving the recovery of ilmenite.

[0009] Preferably, in the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the inclined angle of the inclined pipe and the inclined plate relative to the horizontal plane is 45° to 70°.

[0010] Preferably, in the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the preset spacing ranges from 0.1 mm to 10 mm, and the ratio of the length of the inclined pipe and the inclined plate to the preset spacing ranges from 10 to 200.

[0011] Preferably, in the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the tailings discharge device includes a receiving hopper disposed at the top of the inclined plane sorting device and a tailings discharge pipe disposed on the lower surface of the receiving hopper.

[0012] Preferably, in the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the cross-section of the vertical tube device has the same shape and size as the cross-section of the inclined pipe, and its length is 1 / 20 to 1 / 10 of the length of the inclined pipe.

[0013] Preferably, in the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the feeding and combined magnetic and gravity separation device includes a reducing pipe and a cylindrical pipe disposed inside the reducing pipe. The secondary fluidizing water supply pipe is disposed on the side facing the cylindrical pipe. The upper part of the reducing pipe has the same shape and size as the vertical pipe device, and the lower part has the same shape and size as the vertical settling separation section device. The cross-section of the reducing pipe gradually changes from square to circular from top to bottom, and the diameter of the lower circular cross-section of the reducing pipe is 1 / 10 to 9 / 10 of the width of the upper vertical pipe device.

[0014] Preferably, in the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the magnet is a circular magnet with a diameter of 3mm to 40mm, and is fixed in the hole opened in the inner wall of the feeding and magnetic-gravity combined separation device by means of adhesive or screws, and the magnet is arranged in an alternating manner of N pole and S pole in both the circumferential and axial directions of the inner wall of the feeding and magnetic-gravity combined separation device.

[0015] Preferably, in the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the vertical settling and sorting section is equipped with a grid device, and the grid unit of the grid device is square or hexagonal.

[0016] Preferably, in the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the fluidizer and concentrate discharge device includes a circular pipe with a base, multiple water supply pipes are provided on the side of the circular pipe with the base, an agitator is provided inside, and a discharge pipe is connected to the bottom. The inner diameter of the water supply pipe is 6mm to 10mm, and one water supply pipe is arranged every 3° to 90°. The agitator is a three-blade agitator, a turbine agitator, an anchor agitator, or a ribbon agitator.

[0017] This invention provides a method for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, utilizing the equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite as described in any of the above claims, comprising:

[0018] Turn on the secondary fluidized water supply pipe to feed in secondary fluidized water and make the secondary fluidized water flow towards the inclined plane separation device until it flows out from the tailings discharge device.

[0019] Minerals are fed into the feed pipe, and under the upward thrust of the secondary fluidized water, the minerals move upward and enter the inclined plane sorting device.

[0020] The relatively large-particle-size low-density gangue minerals are suspended in the inclined plane sorting device and continue to move upward on the inclined plate and are transported to the tailings discharge device. The relatively small-particle-size high-density ilmenite settles on the surface of the inclined plate and slides downward, and returns to the vertical tube device, and the concentration of ilmenite in the vertical tube device gradually increases.

[0021] Once the preset concentration is reached, the ilmenite diffuses downwards into the low water flow velocity area below the feed pipe. Under the combined action of gravity and magnetism, the ilmenite passes through the feed and magnetic-gravity combined separation device and continues to move downwards to the vertical settling separation section device, and is finally discharged from below the fluidizer and concentrate discharge device.

[0022] The relatively large-particle-size low-density gangue minerals mixed in are drawn upwards again into the inclined separation device under the action of the secondary fluidized water, and finally discharged from the tailings discharge device, thereby realizing the recovery of ilmenite.

[0023] In summary, the equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite provided by the present invention includes, from top to bottom, a slope separation device, a vertical pipe device, a feed and combined magnetic and gravity separation device, a vertical settling separation section device, a fluidizer, and a concentrate discharge device, all connected sequentially. A tailings discharge device is provided at the top of the slope separation device. Magnets are distributed on the inner wall of the feed and combined magnetic and gravity separation device, and the device includes a feed pipe and a secondary fluidized water supply pipe located below the feed pipe. The water supply pipe is used to supply secondary fluidized water and cause it to flow towards the inclined plane separation device until it flows out from the tailings discharge device. The minerals transported in through the water supply pipe move upwards under the upward thrust of the secondary fluidized water and enter the inclined plane separation device. The inclined plane separation device includes an inclined pipe and inclined plates with a preset spacing disposed therein. Relatively large, low-density gangue minerals are in a suspended state and continue to move upwards on the inclined plates and are transported to the tailings discharge device. High-density ilmenite with small particle size settles on the surface of the inclined plate and slides downwards, returning to the vertical tube device. The concentration of ilmenite in the vertical tube device gradually increases. When a preset concentration is reached, the ilmenite diffuses downwards to the low water flow velocity area below the feed pipe. Under the combined action of gravity and magnetism, the ilmenite passes through the feed and magnetic-gravity combined separation device and continues to move downwards to the vertical settling separation section device, finally being discharged from below the fluidizer and concentrate discharge device. Meanwhile, the relatively large-particle-size low-density gangue minerals mixed in enter the inclined separation device under the action of the secondary fluidized water and finally exit from the tailings discharge device, thus realizing the recovery of ilmenite. It can be seen that this equipment can quickly and effectively separate low-density gangue minerals from ilmenite, thereby improving the TiO2 grade of ilmenite. Therefore, this equipment can improve the separation accuracy of ilmenite, increase the TiO2 grade, and reduce the cost of ilmenite separation while having a simple processing flow and high processing efficiency. The method for recovering ilmenite from vanadium-titanium magnetite using a combination of magnetic and gravity methods provided by this invention has the same advantages as the aforementioned equipment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of an embodiment of a device for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite provided by the present invention;

[0026] Figure 2 This is a schematic diagram of an embodiment of a method for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite provided by the present invention. Detailed Implementation

[0027] The core of this invention is to provide a device and method for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite. This method can improve the sorting accuracy of ilmenite, increase the grade of TiO2, and reduce the cost of ilmenite sorting while maintaining a simple and efficient processing flow.

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] An embodiment of the device for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite provided by the present invention is as follows: Figure 1 As shown, Figure 1 This is a schematic diagram of an embodiment of an apparatus for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite provided by the present invention. The apparatus may include, from top to bottom, a slope separation device A, a vertical pipe device B, a feed and combined magnetic and gravity separation device C, a vertical settling separation section device D, and a fluidizer and concentrate discharge device E, which are connected in sequence. In other words, the interiors of these devices are interconnected, and water can flow freely inside these devices.

[0030] Moreover, the top of the inclined plane sorting device A is equipped with a tailings discharge device F, which is used to discharge the tailings from this part to the outside, so as to achieve effective separation of tailings and ilmenite.

[0031] The inner wall of the aforementioned ore feeding and magnetic-gravity combined separation device C is equipped with magnets 6, which can form a certain magnetic field inside. Therefore, it can generate magnetic force for some magnetic minerals inside. Combined with the gravity of the magnetic minerals themselves, it can increase the force that makes the magnetic minerals fall and overcome the upward force of the water flow, so that the magnetic minerals can move downward. Non-magnetic minerals are not attracted by the magnets, so they will not fall downward under their own gravity. Instead, they will be pushed upward by the force of the water flow to the inclined separation device A, and finally pushed out from the tailings discharge device F. This can effectively separate the minerals. The device also includes an ore feeding pipe 7 and a secondary fluidizing water supply pipe 9 located below the ore feeding pipe 7. The slurry containing ilmenite enters through the ore feeding pipe 7. The ore can be fed tangentially. The pipe diameter can be 5mm to 200mm. The secondary fluidizing water supply pipe 9 is used to feed secondary fluidizing water and make the secondary fluidizing water flow to the inclined separation device A until it flows out from the tailings discharge device F. It can be seen that it can give the minerals an upward push.

[0032] The minerals fed into the ore pipe 7 move upward under the upward thrust of the secondary fluidized water and enter the inclined plane sorting device A. It should be noted that the flow rate of the secondary fluidized water is relatively high in the area between the secondary fluidized water supply pipe 9 and the inclined plane sorting device A, so the thrust provided is large enough that all the minerals fed in at the beginning will be pushed upward into the inclined plane sorting device A, thus achieving sorting in the inclined plane sorting device A first.

[0033] The inclined separation device A includes an inclined pipe 3 and inclined plates 4 with a preset spacing disposed therein. The cross-section of the inclined pipe 3 is preferably square. The relatively large-particle-size low-density gangue minerals are in a suspended state and continue to move upward on the inclined plates 4 and are transported to the tailings discharge device F. The relatively small-particle-size high-density ilmenite settles on the surface of the inclined plates 4 and slides downward, returning to the vertical pipe device B. The concentration of ilmenite in the vertical pipe device B gradually increases. When the preset concentration is reached, the ilmenite diffuses downward to the low water flow velocity area below the feed pipe 7. Under the combined action of gravity and magnetic force, the ilmenite passes through the feed and magnetic-gravity combined separation device C and continues to move downward to the vertical settling separation section device D, and is finally discharged from below the fluidizer and concentrate discharge device E. Meanwhile, the relatively large-particle-size low-density gangue minerals mixed in enter the inclined separation device A upward under the action of secondary fluidized water and finally exit from the tailings discharge device F, thereby realizing the recovery of ilmenite.

[0034] In summary, the embodiments of the equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite provided by the present invention include, from top to bottom, a slope separation device, a vertical pipe device, a feed and combined magnetic and gravity separation device, a vertical settling separation section device, a fluidizer, and a concentrate discharge device; a tailings discharge device is provided at the top of the slope separation device; magnets are distributed on the inner wall of the feed and combined magnetic and gravity separation device, and it includes a feed pipe and a secondary fluidizing water supply pipe located below the feed pipe. The secondary fluidizing water supply pipe is used to feed secondary fluidizing water and make the secondary fluidizing water flow towards the slope separation device until it flows out from the tailings discharge device; the minerals transported in by the feed pipe move upward under the upward thrust of the secondary fluidizing water and enter the slope separation device; the slope separation device includes a slope pipe and inclined plates with a preset spacing disposed therein, and the relatively large low-density gangue minerals are in a suspended state and continue to move upward on the inclined plates and are transported to the tailings discharge device. The relatively small-particle-size high-density ilmenite settles on the surface of the inclined plate and slides downwards, returning to the vertical tube device. The ilmenite concentration within the vertical tube device gradually increases. When a preset concentration is reached, the ilmenite diffuses downwards to the low-flow-velocity area below the feed pipe. Under the combined action of gravity and magnetism, the ilmenite passes through the feed and magnetic-gravity combined separation device and continues downwards to the vertical settling separation section, finally being discharged below the fluidizer and concentrate discharge device. Meanwhile, the relatively large-particle-size low-density gangue minerals mixed in rise upwards into the inclined plate separation device under the action of secondary fluidized water, ultimately exiting through the tailings discharge device. This achieves ilmenite recovery. It is evident that this equipment can quickly and effectively separate low-density gangue minerals from ilmenite, thereby increasing the TiO2 grade of the ilmenite. Therefore, this equipment can improve the separation accuracy of ilmenite, increase the TiO2 grade, and reduce the cost of ilmenite separation while maintaining a simple and efficient processing flow.

[0035] In a specific embodiment of the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the inclined pipe and inclined plate are inclined at an angle of 45° to 70° relative to the horizontal plane. This inclination angle can be selected according to actual needs. The larger the angle, the greater the component of gravity along the direction of the mineral, and the easier it is to fall, and vice versa. The inclination angle here can be further preferred to be 70°.

[0036] In another specific embodiment of the aforementioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the preset spacing ranges from 0.1 mm to 10 mm. When the mineral particles to be processed are small, the preset spacing is set smaller, while when the mineral particles to be processed are large, the preset spacing is set larger. This can be selected as needed. Moreover, the inclined plate can be detachable, and the number of inclined plates can be increased or decreased as needed to enhance its adaptability to processing different particle minerals. The ratio of the length of the inclined pipe and the inclined plate to the preset spacing ranges from 10 to 200. This ratio must be matched with many other factors, such as the flow rate of the secondary fluidizing water. It must be ensured that the secondary fluidizing water can flow out after passing through the entire length of the inclined plate in order to achieve the separation effect. Moreover, the longer the length of the inclined plate, the longer the mineral particles are separated on it, and the better the separation effect. Of course, this can also be selected according to actual needs.

[0037] Continue to refer to Figure 1 In another specific embodiment of the aforementioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the tailings discharge device F may include a receiving hopper 1 located at the top of the inclined plane sorting device A and a tailings discharge pipe 2 located on the lower surface of the receiving hopper 1. The receiving hopper 1 can first catch the tailings from the inclined plane sorting device A, and its internal space can temporarily accommodate the tailings. The tailings discharge pipe 2 provides a discharge channel for these tailings. After the tailings are discharged from here, effective separation from ilmenite is achieved. The size of this tailings discharge pipe must ensure that all the separated tailings can be discharged.

[0038] Furthermore, the cross-section of the aforementioned vertical pipe device B is preferably identical in shape and size to the cross-section of the inclined pipe 3, and its length is 1 / 20 to 1 / 10 of the length of the inclined pipe 3. The main body of this vertical pipe device B can be... Figure 1 The square tube 5 shown has a top that ensures seamless connection between all parts and the bottom surface of the inclined pipe 3. The space formed inside can accommodate some ilmenite flowing down from the inclined pipe 3, as well as a small amount of low-density gangue minerals that are still mixed in, which can then be further sorted.

[0039] Continue to refer to Figure 1In a preferred embodiment of the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the feed and combined magnetic and gravity separation device C may include a reducing pipe 8 and a cylindrical pipe 15 disposed inside the reducing pipe 8. The secondary fluidizing water supply pipe 9 is disposed on the side facing the cylindrical pipe 15. The upper shape and size of the reducing pipe 8 are the same as the shape and size of the vertical pipe device B, and the lower shape and size are the same as the vertical settling separation section device D. The cross-section of the reducing pipe 8 gradually changes from square to circular from top to bottom, and the diameter of the lower circular cross-section of the reducing pipe 8 is 1 / 10 to 9 / 10 of the width of the upper vertical pipe device B. It should be noted that the vertical pipe device B can have a square cross-section. In this case, the cross-sectional shape of the reducing pipe 8 can gradually change from square to circular, thereby effectively connecting the vertical pipe device B and the vertical settling and sorting section device D, ensuring smooth water flow without obstruction. Moreover, the purpose of setting up this cylindrical pipe 15 is to block the newly entered secondary fluidized water, so that the water flows upward or downward, avoiding the secondary fluidized water from the opposite pipe from colliding. The specific size of the cylindrical pipe 15 is not limited and can be selected according to actual needs.

[0040] In another preferred embodiment of the above-mentioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the magnet 6 can be a circular magnet with a diameter of 3mm to 40mm, and is fixed in the hole opened in the inner wall of the feed and combined magnetic and gravity separation device C by means of adhesive or screws. This ensures that it is consistent with the inner surface of the reducing pipe 8 and there will be no protrusion, so as not to obstruct the water flow. In addition, the magnet 6 is arranged with alternating N poles and S poles in both the circumferential and axial directions on the inner wall of the feed and combined magnetic and gravity separation device C. This results in a magnetic field with consistent direction, stronger attraction to magnetic minerals and better uniformity in all directions. In one example, the magnetic field strength can preferably be 1000Oe to 6000Oe.

[0041] In another preferred embodiment of the aforementioned equipment for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, the main body of the vertical settling and sorting section D can be a cylindrical tube 10, inside which a grid device 11 can be installed. The grid units of the grid device 11 are preferably square or hexagonal. It should be noted that the function of this grid device 11 is to prevent the upper slurry from becoming unstable due to excessive stirring intensity, and the side length of its grid unit is preferably 4mm to 8mm, and the height is preferably 10mm to 200mm, which can be selected according to actual needs.

[0042] Further reference Figure 1The fluidizer and concentrate discharge device E mentioned above may include a circular tube 16 with a base. Multiple water supply pipes 12 are provided on the side of the circular tube 16 with a base. An agitator 13 is provided inside the tube, and a discharge pipe 14 is connected to the bottom. The inner diameter of the water supply pipe 12 is preferably 6 mm to 10 mm, and a water supply pipe 12 can be arranged every 3° to 90° along the outer periphery of the circular tube 16 with a base. The agitator 13 can be a three-blade agitator, a turbine agitator, an anchor agitator, or a ribbon agitator. The agitation speed can be selected within 3000 rpm, which can be selected according to actual needs.

[0043] An embodiment of the method for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite provided by this invention is as follows: Figure 2 As shown, Figure 2 This is a schematic diagram of an embodiment of a method for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite provided by the present invention. The apparatus for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, as described in any of the above claims, may include the following steps:

[0044] S1: Open the secondary fluidized water supply pipe to supply secondary fluidized water and make the secondary fluidized water flow towards the inclined separation device until it flows out from the tailings discharge device.

[0045] It should be noted that this secondary fluidized water can provide an upward driving force for mineral particles, which can overcome the gravity of some small mineral particles to move upward to a certain extent. However, large mineral particles, due to their greater gravity, cannot be offset by the driving force of this secondary fluidized water and will fall down. This can achieve a preliminary sorting.

[0046] S2: Minerals are fed into the feed pipe. Under the upward thrust of the secondary fluidized water, the minerals move upward and enter the inclined plane sorting device.

[0047] It should be noted that the minerals entering the inclined plane sorting device at this time include both high-density and low-density particles. When moving inside this inclined plane sorting device, due to the certain inclination angle, gravity will have a component that moves downwards along the inclination, which is smaller than gravity itself. As a result, low-density and high-density mineral particles will have different movement paths on this inclined plane. After all, low-density mineral particles will float up, while high-density particles will sink on the inclined plane and slide down under the influence of gravity, thus achieving separation from high-density mineral particles.

[0048] S3: The relatively large-particle-size low-density gangue minerals are suspended in the inclined plate sorting device and continue to move upward on the inclined plate and are transported to the tailings discharge device. The relatively small-particle-size high-density ilmenite settles on the surface of the inclined plate and slides downward, and returns to the vertical tube device, and the concentration of ilmenite in the vertical tube device gradually increases.

[0049] It should be noted that in this step, the relatively large-grained low-density gangue minerals move upwards, while the relatively small-grained high-density ilmenite moves downwards, thus achieving separation between the two. However, this step alone is not enough to completely separate them. At this point, there are still a small amount of low-density gangue minerals mixed in with the high-density ilmenite, which requires further separation in subsequent steps.

[0050] S4: When the preset concentration is reached, the ilmenite diffuses downwards to the low water flow velocity area below the feed pipe. Under the combined action of gravity and magnetism, the ilmenite passes through the feed and magnetic-gravity combined separation device and continues to move downwards to the vertical settling separation section device, and is finally discharged from below the fluidizer and concentrate discharge device.

[0051] It should be noted that as the concentration of ilmenite increases, it continuously moves downwards. However, since there is no thrust generated during the feeding process below the feed pipe, the water flow velocity in this area is low. Once the ilmenite enters this area, it is no longer subject to strong water flow thrust. Instead, due to the attraction of the magnetic field below, this magnetic force, combined with the gravity of the ilmenite itself, provides a greater downward suction force. This allows the ilmenite to move downwards, pass through the vertical settling and separation section, and finally be discharged to the outside from below the fluidizer and concentrate discharge device, thus achieving effective recovery of ilmenite.

[0052] S5: The relatively large-particle-size low-density gangue minerals mixed in are fed upwards again into the inclined separation device under the action of secondary fluidized water, and finally discharged from the tailings discharge device, thereby realizing the recovery of ilmenite.

[0053] It should be noted that in this step, the small amount of low-density gangue minerals still mixed in with the ilmenite are not magnetic and therefore will not be attracted by the magnet. Moreover, their low density means that their gravity is relatively small and cannot counteract the upward thrust provided by the secondary fluidized water. As a result, the low-density gangue minerals will not be attracted downward in the feed and magnetic-gravity combined separation device. Instead, under the upward thrust of the water flow, they will return upward to the inclined plate and finally be discharged from the tailings discharge device above. It can be seen that this scheme can achieve more efficient recovery of ilmenite and greatly reduce the impurity content in ilmenite.

[0054] The steps for using the above-mentioned equipment are as follows:

[0055] The ilmenite-bearing slurry enters through feed pipe 7. Larger particles and those capable of faster settling, along with some weakly magnetic ilmenite with a higher magnetic susceptibility, immediately settle downwards to the lower part of the vertical section. However, the water flow velocity is relatively high above feed pipe 7, so most of the incoming solids are initially conveyed upwards. Therefore, many valuable fine-grained ilmenite particles are conveyed upwards to inclined pipe 3, where they then enter closely spaced inclined plates with a spacing of 0.1 mm to 10 mm. The length of inclined pipe 3 can be 100 mm to 1000 mm, thus allowing for a high aspect ratio of 10 to 10000, which provides the advantage of long mineral particle trajectories and large settling distances. A significant shear rate is formed between the surfaces of the inclined plates, promoting shear-induced lift and shear-induced hydrodynamic diffusion. Therefore, relatively large, low-density gangue minerals are resuspended and continue to be conveyed upwards to the receiving hopper, while relatively fine, high-density ilmenite settles on the surface and slides downwards, eventually returning to the vertical pipe assembly 5. Ultimately, these fine, high-density ilmenite particles leave the inclined pipe 3 via overflow or underflow, reaching a concentration sufficient to diffuse downwards into the underflow through the vertical pipe assembly. Once these particles are transported below the level of the feed pipe 7, they are exposed to much lower surface velocities, thus making their transport into the underflow suddenly much easier. Once located below the feed pipe 7, many particles settle downwards. Large, low-density mineral particles, under the influence of secondary fluidizing water and the reducing pipe, flow upwards into the inclined pipe 3. Meanwhile, the magnetically strong and dense ilmenite particles, attracted by the magnet's force, struggle to rise and, under gravity, continue sliding down the reducing pipe wall. Passing through the gap between the cylindrical pipe 15 and the reducing pipe 8, and through the vertical cylindrical pipe 10, a low-density fluidized bed with high suspension density is formed. This high suspension density, in turn, creates a dense medium effect, promoting the upward movement of displaced, coarse, low-density impurity particles until they finally enter the inclined pipe 3 and are transported to the receiving hopper 1, ultimately being discharged to the outside. The dense ilmenite particles settle in the vertical cylindrical pipe 10, where the grid device 11 forms an isolation section, ensuring vertical settling of the ilmenite particles without strong agitation. A suitable amount of water is introduced into the water supply pipe 12. Under the strong stirring action of the agitator, the water and ilmenite mineral particles form a stable and uniform fluidized state, and some ilmenite minerals are discharged through the discharge pipe 14. Therefore, it can be seen that in this magnetic-gravity combined recovery equipment for ilmenite, there is a strong synergistic effect among the inclined plane separation device A, the feeding and magnetic-gravity combined separation device C, the vertical settling separation section device D, and the fluidizer and concentrate discharge device E. Under the attraction of the magnetic force of the magnet, the magnetic ilmenite particles are difficult to rise, and under the action of gravity, they continue to slide down the pipe wall of the variable diameter pipe, thereby achieving efficient separation.

[0056] The above equipment and methods are explained in detail below with two practical examples:

[0057] First example:

[0058] The chemical composition of the vanadium-titanium magnetite tailings used for iron beneficiation is as follows: containing 11.51% TFe, 8.32% TiO2, 2.77% MgO, 6.57% SiO2, 5.88% Al2O3, and 4.32% CaO.

[0059] (1) Vanadium-titanium magnetite is fed into a first-stage grinding operation for grinding, and the fineness of the grinding product is controlled to be -0.074 mm, accounting for 75%;

[0060] (2) The grinding product from step (1) is fed into a device for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite. The surface magnetic field strength of the magnet is controlled at 4000 Oe, the feed concentration is 33.00%, the feed volume rate is 1 L / min, the secondary fluidizing water rate is 0.5 L / min, the stirring speed of the agitator is 20 rpm, the volume rate of the feed water in the lower fluidizer is 0.5 L / min, the upper overflow yields tailings, and the lower discharge pipe yields titanium concentrate.

[0061] (3) The specific equipment parameters used are as follows: the cross section of the inclined pipe is a 100mm×100mm square, which is inclined at a 70° angle to the horizontal plane, the spacing between the inclined plates is 7mm, and its length is 1000mm; the length of the square vertical pipe device is 300mm, and its cross section is 100mm×100mm; the ore is fed tangentially, the diameter of the ore feed pipe is 10mm, the diameter reducer 8 changes from the square above to a circle, wherein the square above the diameter reducer is a 100mm×100mm square, and the diameter of the circle below the diameter reducer is 60mm; the diameter of the cylindrical pipe 15 is 60mm; the magnet is a round magnet with a diameter of 5mm, which is fixed by adhesive or screws, embedded in the diameter reducer, and is flush with the inner surface of the diameter reducer. The magnets are arranged with alternating N and S poles in both the radial and axial directions, with a magnetic field strength of 4000 Oe. The cylindrical tube 10 inside the vertical settling and sorting device has a diameter of 60 mm and contains a hexagonal grid device with a width of 4 mm and a height of 100 mm. The fluidizer's water supply pipe has an inner diameter of 8 mm and is arranged circumferentially along the cylindrical tube 10, with a spacing of one pipe every 90°. The agitator is a ribbon agitator with a stirring speed of 20 rpm. The discharge pipe has a diameter of 10 mm. The final results are shown in Table 1, which is the product specification table for the first example.

[0062] Table 1. Product Indicators Obtained from the First Example

[0063]

[0064] Second example:

[0065] The vanadium-titanium magnetite tailings used in the iron beneficiation process came from the high-gradient magnetic separation concentrate of the titanium beneficiation operation of vanadium-titanium magnetite. Its chemical composition is as follows: containing TFe 21%, TiO2 17.02%, MgO 3.75%, SiO2 5.89%, Al2O3 5.01%, and CaO 3.66%.

[0066] (1) The high gradient magnetic separation concentrate of the first stage of the titanium beneficiation operation of the above vanadium-titanium magnetite is fed into the equipment for combined magnetic and gravity recovery of ilmenite in vanadium-titanium magnetite. The surface magnetic field strength of the magnet is controlled at 3000 Oe, the feed concentration is 33.00%, the feed volume rate is 1L / min, the secondary fluidizing water rate is 0.75L / min, the stirring speed of the agitator is 30rpm, the volume rate of the feed water in the lower fluidizer is 0.5L / min, the upper overflow is the tailings, and the lower discharge pipe is the titanium concentrate.

[0067] (2) The equipment parameters used are the same as in the first example. The final results are shown in Table 2, which is the product index table obtained in the second example.

[0068] Table 2. Product Indicators Table from the Second Example

[0069]

[0070] It is evident that by utilizing the aforementioned equipment and method provided in this application, the enrichment level of titanium dioxide can be increased to 2 to 4 times the original level, and the recovery rate can be greatly improved.

[0071] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, characterized in that, It includes, from top to bottom, a series of interconnected inclined plane separation devices, vertical tube devices, ore feeding and magnetic-gravity combined separation devices, vertical settling separation devices, fluidizers and concentrate discharge devices; The top of the inclined plane sorting device is equipped with a tailings removal device. The inner wall of the feeding and magnetic-gravity combined separation device is distributed with magnets, and includes a feeding pipe and a secondary fluidized water supply pipe located below the feeding pipe. The secondary fluidized water supply pipe is used to feed in secondary fluidized water and make the secondary fluidized water flow towards the inclined separation device until it flows out from the tailings discharge device. The minerals fed into the feed pipe move upward under the upward thrust of the secondary fluidized water and enter the inclined plane sorting device; The inclined plane separation device includes an inclined pipe and inclined plates with a preset spacing disposed therein. Relatively large low-density gangue minerals are suspended and continue to move upwards on the inclined plates and are conveyed to the tailings discharge device. Relatively small high-density ilmenite settles on the surface of the inclined plates and slides downwards, returning to the vertical pipe device. The concentration of ilmenite in the vertical pipe device gradually increases. When a preset concentration is reached, the ilmenite diffuses downwards to the low-flow-velocity area below the feed pipe. Under the combined action of gravity and magnetism, the ilmenite passes through the feed and magnetic-gravity combined separation device and continues to move downwards to the vertical settling separation section device, finally being discharged below the fluidizer and concentrate discharge device. Meanwhile, the relatively large low-density gangue minerals mixed in are pushed upwards by the secondary fluidized water and enter the inclined plane separation device, finally exiting from the tailings discharge device, thus achieving the recovery of ilmenite.

2. The equipment for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite according to claim 1, characterized in that, The inclined pipe and the inclined plate are inclined at an angle of 45° to 70° relative to the horizontal plane.

3. The equipment for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite according to claim 1, characterized in that, The preset spacing ranges from 0.1 mm to 10 mm, and the ratio of the length of the inclined pipe and the inclined plate to the preset spacing ranges from 10 to 200.

4. The equipment for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite according to claim 1, characterized in that, The tailings removal device includes a receiving hopper located at the top of the inclined plane sorting device and a tailings discharge pipe located on the lower surface of the receiving hopper.

5. The equipment for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite according to claim 1, characterized in that, The cross-section of the vertical tube device has the same shape and size as the cross-section of the inclined pipe, and its length is 1 / 20 to 1 / 10 of the length of the inclined pipe.

6. The equipment for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite according to claim 1, characterized in that, The ore feeding and magnetic-gravity combined separation device includes a reducing pipe and a cylindrical pipe disposed inside the reducing pipe. The secondary fluidizing water supply pipe is disposed on the side facing the cylindrical pipe. The upper part of the reducing pipe has the same shape and size as the vertical pipe device, and the lower part has the same shape and size as the vertical settling separation section device. The cross-section of the reducing pipe gradually changes from square to circular from top to bottom, and the diameter of the lower circular cross-section of the reducing pipe is 1 / 10 to 9 / 10 of the width of the upper vertical pipe device.

7. The equipment for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite according to claim 6, characterized in that, The magnet is a circular magnet with a diameter of 3mm to 40mm, and is fixed in the hole opened in the inner wall of the ore feeding and magnetic gravity combined separation device by means of adhesive or screw. The magnet is arranged with alternating N poles and S poles in both the circumferential and axial directions of the inner wall of the ore feeding and magnetic gravity combined separation device.

8. The equipment for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite according to claim 1, characterized in that, The vertical settlement sorting device is equipped with a grid device, and the grid unit of the grid device is square or hexagonal.

9. The equipment for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite according to claim 1, characterized in that, The fluidizer and concentrate discharge device includes a circular pipe with a base. Multiple water supply pipes are provided on the side of the circular pipe with the base. An agitator is installed inside the pipe, and a discharge pipe is connected to the bottom. The inner diameter of the water supply pipe is 6mm to 10mm, and one water supply pipe is arranged every 3° to 90°. The agitator is a three-blade agitator, a turbine agitator, an anchor agitator, or a ribbon agitator.

10. A method for the combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite, characterized in that, The apparatus for combined magnetic and gravity recovery of ilmenite from vanadium-titanium magnetite as described in any one of claims 1-9 comprises: Turn on the secondary fluidized water supply pipe to feed in secondary fluidized water and make the secondary fluidized water flow towards the inclined plane separation device until it flows out from the tailings discharge device. Minerals are fed into the feed pipe, and under the upward thrust of the secondary fluidized water, the minerals move upward and enter the inclined plane sorting device. The relatively large-particle-size low-density gangue minerals are suspended in the inclined plane sorting device and continue to move upward on the inclined plate and are transported to the tailings discharge device. The relatively small-particle-size high-density ilmenite settles on the surface of the inclined plate and slides downward, and returns to the vertical tube device, and the concentration of ilmenite in the vertical tube device gradually increases. Once the preset concentration is reached, the ilmenite diffuses downwards into the low water flow velocity area below the feed pipe. Under the combined action of gravity and magnetism, the ilmenite passes through the feed and magnetic-gravity combined separation device and continues to move downwards to the vertical settling separation section device, and is finally discharged from below the fluidizer and concentrate discharge device. The relatively large-particle-size low-density gangue minerals mixed in are drawn upwards again into the inclined separation device under the action of the secondary fluidized water, and finally discharged from the tailings discharge device, thereby realizing the recovery of ilmenite.

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