Device and method for magnetic field enhanced recovery of fine particle size ilmenite

Abstract

The application discloses a micro-fine particle grade ilmenite magnetic field reinforced recovery device and method, relates to the magnetic separation field of separating solid materials from fluid, and solves the problem that micro-fine particle grade ilmenite and gangue are difficult to separate. The technical scheme is as follows: the micro-fine particle grade ilmenite magnetic field reinforced recovery device comprises a shell and an inclined plate, the shell has an inner cavity in the shape of an inclined quadrangular prism, at least two inclined plates are fixed in the inner cavity of the shell, the inclined plates are double-layer structures, the double-layer structures are respectively upper layers and lower layers, the upper surface of the lower layer is provided with continuous or intermittent tines; a separation channel is formed between the two adjacent inclined plates, the upper and lower ends of the separation channel are overflow outlets and underflow outlets, the underflow outlet is provided with an opening adjusting device, each separation channel is provided with a feeding port and a water inlet, and the shell is further provided with a magnetic field generator. The tines of the lower layer of the inclined plate form a magnetic field reinforced area in the separation channel, the force and the movement direction of the ore particles are changed, and the purpose of separating ilmenite and gangue is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of magnetic separation and gravity separation of solid materials with different magnetism and specific gravity from fluid, in particular to a device and method for recovering fine-grained ilmenite by magnetic field intensification. BACKGROUND

[0002] Vanadium-titanium magnetite in Panxi area is an important strategic resource of iron, vanadium and titanium in China. The main valuable minerals in the ore are ilmenite and titanomagnetite, and the main gangue minerals are pyroxene, feldspar, olivine and amphibole, as well as their altered minerals. Ilmenite and other associated minerals have certain differences in magnetism, specific gravity, wettability and electrical properties. The main beneficiation process for recovering ilmenite includes magnetic separation-flotation, magnetic separation-gravity separation-flotation and gravity separation-magnetic separation. The equipment used in magnetic separation and gravity separation is mainly high gradient magnetic separator and spiral chute, which is suitable for ilmenite pre-concentration.

[0003] The existing beneficiation process produces tailings containing a large amount of fine-grained ilmenite with a particle size less than 38 μm. The fine-grained ilmenite has a small particle size, and the existing beneficiation process and corresponding equipment have poor recovery capacity for fine-grained ilmenite. SUMMARY

[0004] The present application first provides a fine-grained ilmenite magnetic field intensification recovery device to solve the problem that the existing magnetic separation equipment cannot separate fine-grained ilmenite from gangue minerals.

[0005] The technical solution adopted by the present application to solve the above technical problems is: a fine-grained ilmenite magnetic field intensification recovery device, which comprises a shell and an inclined plate installed in the shell. The shell is made of non-magnetic material and has an inner cavity in the shape of an inclined quadrangular prism. The upper and lower surfaces of the inclined quadrangular prism correspond to the upper and lower ends of the shell, respectively. At least two inclined plates are fixed in the inner cavity of the shell. Each inclined plate is a rectangular plate and is identical. The large surface of each inclined plate is parallel to the rectangular side surface of the inclined quadrangular prism. The inclined plates are arranged at equal intervals. The two side surfaces of each inclined plate are in sealing cooperation with the inner wall of the shell. Each inclined plate has a double-layer structure, which comprises an upper layer made of non-magnetic material and a lower layer made of magnetic material. The upper surface of the upper layer and the lower surface of the lower layer are flat surfaces. The upper surface of the lower layer is provided with continuous or intermittent sharp teeth. A separation channel is formed between two adjacent inclined plates. The upper and lower ends of the separation channel are overflow outlet and underflow outlet, respectively. An opening adjusting device is arranged at the underflow outlet. Each separation channel is provided with a feed inlet and a water inlet. The feed inlet is opened in the shell and located between the overflow outlet and the underflow outlet. The water inlet is opened in the shell and located between the feed inlet and the underflow outlet. Two side surfaces of the shell corresponding to the two rectangular side surfaces of the inclined quadrangular prism are respectively provided with magnetic field generators. The S level and the N level of the two magnetic field generators are oppositely arranged.

[0006] The thickness of the sorting channel (the net distance between two adjacent inclined plates) is small, and the sorting channel is at risk of being blocked. In order to facilitate the quick unblocking of the sorting channel when it is blocked, further, each sorting channel is provided with a flushing port, which is opened in the shell and located at each opening adjusting device.

[0007] In order to facilitate the collection of overflow liquid overflowing from each overflow outlet, further, an annular overflow groove is further arranged around the upper end of the shell. In order to facilitate the collection of underflow liquid flowing out of each underflow outlet, further, a liquid collecting groove is arranged at the bottom of the shell, and each underflow outlet is in communication with the liquid collecting groove.

[0008] In order to quickly and uniformly distribute and laminarize the ore liquid after entering the sorting channel, further, each feed inlet of the shell is connected with a distributing pipe at one end in the sorting channel. The axis of the distributing pipe is parallel to the upper and lower bottom surfaces of the corresponding inclined quadrilateral prism in the inner cavity of the shell. The axis of the distributing pipe is also parallel to the corresponding plane of the inclined plate. The length of the distributing pipe is equal to the distance between the two parallelogram sides of the corresponding inclined quadrilateral prism in the inner cavity of the shell. The side of the distributing pipe facing the overflow outlet is provided with a plurality of discharge holes, or the side of the distributing pipe facing the overflow outlet is provided with a discharge groove.

[0009] The lower layer of the inclined plate is a magnetic material, that is, the lower layer is a material that can be magnetized. For example, the material of the lower layer of the inclined plate is paramagnetic field material or ferromagnetic material. The shell and the upper layer of the inclined plate are both non-magnetic materials. For example, the shell and the upper layer of the inclined plate are both plastic.

[0010] The magnetic field generator is an object or device that can generate a magnetic field. For example, the magnetic field generator is a permanent magnet or an electromagnet.

[0011] The tines of the lower layer of the inclined plate form a magnetic field strengthening area in the sorting channel, which changes the stress and movement direction of the fine particle grade ilmenite. Specifically, the upper surface of the lower layer of the inclined plate is in a stepped shape, and the tread surface of the step is parallel to the upper and lower bottom surfaces of the corresponding inclined quadrilateral prism in the inner cavity of the shell. Alternatively, the upper surface of the lower layer of the inclined plate is provided with staggered tines.

[0012] In order to avoid the existence of a cavity between the upper layer and the lower layer of the inclined plate and improve the stability between the upper layer and the lower layer of the inclined plate, further, the shape of the lower surface of the upper layer of the inclined plate and the upper surface of the lower layer of the inclined plate is mutually matched.

[0013] The upper layer of the inclined plate and the shell both have the function of fixing the lower layer of the inclined plate. Specifically, the upper layer of the inclined plate and the shell are an integral or fixed connection, and the lower layer of the inclined plate is fixed to the upper layer of the inclined plate.

[0014] The application provides a micro-fine ilmenite magnetic field strengthening recovery method, which solves the problem of difficult separation of micro-fine ilmenite and gangue. The micro-fine ilmenite magnetic field strengthening recovery method uses any micro-fine ilmenite magnetic field strengthening recovery device to recover ilmenite, first, the magnetic field generator is turned on, and clean water is introduced into the separation channel through the water inlet, the clean water flows in the separation channel in a laminar flow and flows out from the overflow outlet and the underflow outlet of the separation channel, then the ore liquid containing micro-fine ilmenite and gangue is sent into the separation channel from the feed inlet, the micro-fine ilmenite sinks to the underflow outlet, and finally the sand is collected from the underflow outlet.

[0015] In order to avoid the separation channel being blocked, further, the ore liquid first removes titanomagnetite in the ore liquid, and then is sent into the separation channel.

[0016] In order to better control the beneficiation process, further, the volume concentration of the ore liquid sent into the separation channel is higher than 30%, the volume concentration of the ore liquid flowing out from the overflow outlet is lower than 10%, and the volume concentration of the sand is higher than 50%.

[0017] In order to facilitate the collection of micro-fine ilmenite, further, the volume concentration of the sand flowing out from the underflow outlet is higher than 50%.

[0018] The application has the advantages that: the upper surface of the inclined plate (i.e. the upper surface of the upper layer) and the lower surface of the inclined plate (i.e. the lower surface of the lower layer) are flat surfaces, i.e. the upper and lower sides of the separation channel are flat surfaces, the inclined plates are arranged in parallel and at equal intervals, the separation channel is formed between the adjacent two inclined plates, the thickness of the separation channel (the net interval between the adjacent two inclined plates) is small and uniform, the ore liquid is dispersed in a stable laminar flow after entering the separation channel from the feed inlet, and the laminar flow velocity is greater the farther away from the inclined plate, and the separation channel eliminates the influence of turbulence. The upper layer of the inclined plate is a non-magnetic material, the lower layer of the inclined plate is a magnetic material, and the upper surface is provided with continuous or intermittent tines, the lower layer of the inclined plate is magnetized by the magnetic field generator, and then the magnetic field strength of the lower side of the separation channel near the tines is enhanced, and the magnetic field is a gradient magnetic field, the change direction of the magnetic field is perpendicular to the slurry flow direction in the separation channel, the gradient magnetic field is used as a strengthening separation measure, unlike the general high-intensity magnetic separators which resist the impact force of high flow rate water flow through adsorption, the water flow rate in the application is slow, and the required magnetic field strength is weak, so that the equipment cost is low and the operation energy consumption is small. The fine particle grade ilmenite has the characteristics of large specific magnetization coefficient and large specific gravity compared with the gangue, under the combined action of the magnetic field and gravity, the ilmenite has a greater component force to the downward inclined plate, so that the settling speed is faster, the ilmenite and the gangue have different stress and movement directions in the separation channel, most of the gangue flows out from the overflow outlet at the upper end of the separation channel, and the ilmenite flows out from the underflow outlet at the lower end of the separation channel, so that the separation of the ilmenite and the gangue is finally realized, and the separation efficiency is high. The application separates solid materials with different magnetism and specific gravity from fluid by using the methods of magnetic separation and gravity separation, can effectively enrich the fine particle grade ilmenite lost in the tailings, and improve the comprehensive utilization efficiency of vanadium-titanium-magnetite. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective structural schematic view of an embodiment of the fine particle grade ilmenite magnetic field reinforced recovery device.

[0020] Figure 2 is Figure 1 the embodiment shown in the structure schematic view of the longitudinal section perpendicular to the inclined plate.

[0021] Figure 3 is Figure 2 the enlarged view of the lower part.

[0022] Figure 4 is Figure 2 the flow velocity, magnetic field and movement trajectory of the mineral particles in the separation channel.

[0023] Figure reference numerals: 1. Shell; 2. Inclined plate; 3. Upper layer 2-1; 4. Lower layer 2-2; 5. Opening adjustment device; 6. Feed inlet; 7. Magnetic field generator; 8. Water inlet; 9. Overflow trough; 10. Liquid collection trough; 11. Schematic diagram of velocity distribution; 12. Schematic diagram of magnetic field distribution; 13. Trajectory of ilmenite; 14. Trajectory of gangue ore. Detailed Implementation

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] The first subject of this invention is a magnetic field-enhanced recovery device for fine-grained ilmenite. For example... Figure 1 As shown, the micro-particle-scale ilmenite magnetic field-enhanced recovery device includes a shell 1 and inclined plates 2 installed inside the shell 1. The shell 1 is made of a non-magnetic material, that is, a material that cannot be magnetized, such as plastic or a non-magnetized metal. The shell 1 has an inner cavity in the shape of an oblique quadrangular prism. The upper and lower bases of the oblique quadrangular prism correspond to the upper and lower ends of the shell 1, respectively. The oblique quadrangular prism has four sides, two of which are rectangular sides arranged opposite each other, and two are parallelogram sides arranged opposite each other. Assuming the upper and lower bases of the oblique quadrangular prism corresponding to the inner cavity of the shell 1 are horizontal, the rectangular sides of the oblique quadrangular prism are arranged at an angle, and the parallelogram sides are arranged vertically. At least two inclined plates 2 are fixed in the inner cavity of the shell 1. Each inclined plate 2 is a rectangular plate and identical. "Identical" means that each inclined plate 2 has the same shape, structure, and material. The larger surface of each inclined plate 2 is parallel to the rectangular side of the oblique quadrangular prism, that is, each inclined plate 2 is arranged at an angle. The larger surface of the inclined plate 2 refers to the surface with the largest surface area. The inclined plates 2 are arranged at equal intervals and are parallel to each other, with the distance between any two adjacent inclined plates 2 being equal. A sorting channel 3 is formed between two adjacent inclined plates 2, and the thickness of each sorting channel 3 is equal, meaning the net distance between two adjacent inclined plates 2 is equal. Both sides of each inclined plate 2 are sealed to the inner wall of the housing 1, specifically, the two sides of the inclined plate 2 are sealed to the inner wall corresponding to the two parallelogram sides of the inclined quadrangular prism.

[0026] Each of the inclined plates 2 is double-layered, and the double layers are an upper layer 2-1 of non-magnetic material and a lower layer 2-2 of magnetic material. The upper surface of the upper layer 2-1 and the lower surface of the lower layer 2-2 are flat, so that both large surfaces of the inclined plate 2 are flat. The lower layer 2-2 of the inclined plate 2 is of magnetic material, i.e. the lower layer 2-2 is of material that can be magnetized. For example, the material of the lower layer 2-2 of the inclined plate 2 is paramagnetic material or ferromagnetic material. The upper layer 2-1 of the inclined plate 2 is of non-magnetic material. For example, the upper layer 2-1 of the inclined plate 2 is plastic or metal that cannot be magnetized. The lower surface of the upper layer 2-1 and the upper surface of the lower layer 2-2 are in close contact with each other and are relatively fixed. The upper surface of the lower layer 2-2 is provided with continuous or discontinuous sharp teeth. The lower surface of the upper layer 2-1 can be flat, in which case there is a cavity between the upper layer 2-1 and the lower layer 2-2. The lower surface of the upper layer 2-1 can also be of a shape complementary to the upper surface of the lower layer 2-2, in which case there is no cavity between the upper layer 2-1 and the lower layer 2-2. In order to prevent ore liquid from entering the cavity between the upper layer 2-1 and the lower layer 2-2 of the inclined plate 2, the lower surface of the upper layer 2-1 and the upper surface of the lower layer 2-2 are preferably complementary to each other, i.e. there is no cavity between the upper layer 2-1 and the lower layer 2-2. The upper layer 2-1 of the inclined plate 2 and the shell 1 both have the function of fixing the lower layer 2-2 of the inclined plate 2. The lower layer 2-2 of the inclined plate 2 can be directly fixed to the shell 1, or the lower layer 2-2 is fixed to the upper layer 2-1, and the upper layer 2-1 and the shell 1 are integrated or fixedly connected.

[0027] The two adjacent inclined plates 2 form a separation channel 3, and the upper and lower ends of the separation channel 3 are overflow outlets and underflow outlets, respectively. In order to facilitate the collection of overflow liquid overflowing from each overflow outlet, an annular overflow groove 8 is further arranged at the upper end of the shell 1, and the overflow liquid of each separation channel 3 enters the overflow groove 8. In order to facilitate the collection of underflow liquid flowing from each underflow outlet, a liquid collecting groove 9 is arranged at the bottom of the shell 1, and each underflow outlet is in communication with the liquid collecting groove 9. For example, the bottom of the shell 1 is provided with a bucket-shaped liquid collecting groove 9, and the underflow liquid of each separation channel 3 flows into the bucket-shaped liquid collecting groove 9. An opening adjusting device 4 is arranged at the underflow outlet, and the opening adjusting device 4 is used to adjust the size of the underflow outlet. For example, the opening adjusting device 4 is an adjusting plate rotatably arranged at the overflow outlet. The underflow outlet of the separation channel 3 is rectangular, and the width of the rectangle is the thickness of the separation channel 3, i.e. the width of the rectangle is the net distance between the two adjacent inclined plates 2. The opening adjusting device 4 is only used to adjust the width of the rectangle corresponding to the underflow outlet, and the opening adjusting device 4 does not change the length of the rectangle corresponding to the underflow outlet.

[0028] Each sorting channel 3 is provided with a feed inlet 5 and a water inlet 7. The feed inlet 5 is used for the ore liquid to enter the sorting channel 3, and the feed inlet 5 is arranged on the shell 1 and located between the overflow outlet and the underflow outlet. The feed inlet 5 is generally arranged at a lower position in the middle of the shell 1. The water inlet 7 is used for feeding clean water into the sorting channel 3 before ore dressing, and forming laminar flow at the upper and lower ends of the sorting channel 3, so as to prepare for the ore liquid to enter the sorting channel 3. The water inlet 7 is arranged on the shell 1 and located between the feed inlet 5 and the underflow outlet. In order to enable the ore liquid to be quickly and uniformly distributed in the sorting channel 3 and form laminar flow after entering the sorting channel 3, the feed inlet 5 of each sorting channel 3 is connected with a distribution pipe, the axis of the distribution pipe is parallel to the upper and lower bottom surfaces of the corresponding oblique quadrilateral prism in the inner cavity of the shell 1, the axis of the distribution pipe is also parallel to the corresponding plane of the inclined plate 2, the length of the distribution pipe is equal to the distance between the two parallelogram sides of the corresponding oblique quadrilateral prism in the inner cavity of the shell 1, and a plurality of discharge holes are arranged on the side of the distribution pipe facing the overflow outlet or a discharge slot is arranged on the side of the distribution pipe facing the overflow outlet. In order to enable the clean water to quickly form laminar flow after entering the sorting channel 3 through the water inlet 7, the water inlet 7 of each sorting channel 3 is connected with a distribution pipe, the axis of the distribution pipe is parallel to the upper and lower bottom surfaces of the corresponding oblique quadrilateral prism in the inner cavity of the shell 1, the axis of the distribution pipe is also parallel to the corresponding plane of the inclined plate 2, the length of the distribution pipe is equal to the distance between the two parallelogram sides of the corresponding oblique quadrilateral prism in the inner cavity of the shell 1, and a plurality of discharge holes are arranged on the side of the distribution pipe facing the overflow outlet or a discharge slot is arranged on the side of the distribution pipe facing the overflow outlet.

[0029] The thickness of the sorting channel 3 is small, and the sorting channel 3 has a risk of being blocked, especially the underflow outlet at the lower end of the sorting channel 3. In order to facilitate the quick dredging of the sorting channel 3 when it is blocked, each sorting channel 3 is provided with a flushing port, and the flushing port is arranged on the shell 1 and located at each opening adjusting device 4. The flushing water can directly enter the sorting channel 3 from the flushing port. Since the underflow outlet of the sorting channel 3 is rectangular, in order to improve the flushing efficiency, the flushing port of each sorting channel 3 is connected with a water inlet pipe at one end in the sorting channel 3, the axis of the water inlet pipe is parallel to the upper and lower bottom surfaces of the corresponding oblique quadrilateral prism in the inner cavity of the shell 1, the axis of the water inlet pipe is also parallel to the corresponding plane of the inclined plate 2, the length of the water inlet pipe is equal to the distance between the two parallelogram sides of the corresponding oblique quadrilateral prism in the inner cavity of the shell 1, and a plurality of water outlet holes are arranged on the side of the water inlet pipe facing the underflow outlet or a water outlet slot is arranged on the side of the water inlet pipe facing the underflow outlet, so that the flushing water can flush the underflow outlet in the form of jet. After ore dressing, the flushing port can also be used for cleaning the sorting channel 3. The distribution pipe and the water inlet pipe are generally circular pipes and are located on the lower surface of the lower layer 2-2 of the inclined plate 2.

[0030] The two side surfaces of the shell 1 corresponding to the two rectangular side surfaces of the oblique quadrangular prism are respectively provided with magnetic field generators 6, and the S level and the N level of the two magnetic field generators 6 are oppositely arranged. The magnetic field generator 6 is an object or device capable of generating a magnetic field, and the magnetic field generator 6 is a permanent magnet or an electromagnet. The upper surface of the lower layer 2-2 of the inclined plate 2 is provided with continuous or intermittent sharp teeth, and the sharp teeth are long strips or staggered sharp cones. For example, the upper surface of the lower layer 2-2 of the inclined plate 2 is in a stepped shape, and the tread surface of the step is parallel to the upper and lower bottom surfaces of the oblique quadrangular prism corresponding to the inner cavity of the shell 1; or the upper surface of the lower layer 2-2 of the inclined plate 2 is provided with staggered sharp cones. Under the joint action of the two magnetic field generators 6 and the lower layer 2-2 of the inclined plate 2, a gradient magnetic field is formed in the sorting channel 3, and the magnetic field strength near the lower layer 2-2 of the inclined plate 2 is higher, as shown in Figure 4 .

[0031] The ore particles (including ilmenite and gangue) in the sorting channel 3 are subjected to four forces, which are gravity, buoyancy, viscous resistance and magnetic force. Among them, the direction of gravity is vertically upward, the direction of buoyancy is vertically upward, the size of gravity and buoyancy is fixed and the direction of resultant force is vertically downward. The viscous resistance is affected by the relative motion speed difference between the ore particles and the water flow, and the direction is opposite to the relative motion direction. The size of the magnetic force is affected by the magnetic field gradient, and the magnetic force is along the magnetic induction line and towards the direction where the magnetic induction lines are dense. When the ore particles just enter the sorting channel 3, the four forces of gravity, buoyancy, viscous resistance and magnetic force acting on the ore particles in the direction perpendicular to the upper surface of the inclined plate 2 are not zero, and the ilmenite with the same particle size and the same initial speed has a larger force in this direction, so it has a larger acceleration in this direction. The ilmenite will be closer to the lower wall surface (the upper surface of the inclined plate 2) of the sorting channel 3 than the gangue entering the sorting channel 3 at the same time, and the ilmenite will start to move downward because the water flow velocity near the lower wall surface of the sorting channel 3 is small, and the resistance received by the ilmenite is small. Therefore, the ilmenite finally enters the underflow outlet of the sorting channel 3. The gangue needs a longer inclined plate length to flow into the underflow outlet, and when the length of the inclined plate is reduced, the gangue will enter the overflow outlet. The velocity distribution in the sorting channel 3, the magnetic field distribution, the movement trajectory of the ilmenite and the movement trajectory of the gangue are shown in Figure 4 . The present application forms a magnetic field strengthening area in the sorting channel 3 by using the sharp teeth of the lower layer 2-2 of the inclined plate 2, changes the force and movement direction of the fine particle grade ore particles, and achieves the purpose of separating ilmenite and gangue.

[0032] The second subject of the present application is a micro-fine ilmenite magnetic field reinforced recovery method. The micro-fine ilmenite magnetic field reinforced recovery method recovers ilmenite by using the micro-fine ilmenite magnetic field reinforced recovery device of the first subject. First, the magnetic field generator 6 is turned on, and clean water is fed into the separation channel 3 through the water inlet 7. The clean water flows in the separation channel 3 in a laminar flow and flows out from the overflow outlet and the underflow outlet of the separation channel 3. Then, the ore liquid containing micro-fine ilmenite and gangue is fed into the separation channel 3 from the feed inlet 5. The micro-fine ilmenite sinks to the underflow outlet. Finally, the sand is collected from the underflow outlet. The sand is actually the selected ore slurry, mainly the ore slurry of titanomagnetite and ilmenite. The volume concentration of the sand is generally controlled to be higher than 50%. The selected sand can be repeatedly cleaned according to the micro-fine ilmenite magnetic field reinforced recovery method to improve the grade of ilmenite.

[0033] Before recovering ilmenite, the water inlet 7 is opened and the water inlet pressure is adjusted. At the same time, the opening degree adjusting device at the underflow outlet is adjusted to ensure that the flow rates of the overflow outlet and the underflow outlet are appropriate values. The flow rate of the underflow outlet should be as small as possible as long as it does not block. The flow rate of the overflow outlet should be appropriate to form a laminar flow in the separation channel 3, and the flow rate should match the particle size and density of the mineral. At the same time, the magnetic field generator 6 is turned on, and the distance between the permanent magnets or the current of the electromagnet is adjusted to appropriate values. The titanomagnetite in the ore liquid is easy to be adsorbed on the inclined plate 2, which may cause the separation channel 3 to be blocked. In order to avoid the separation channel 3 being blocked, the titanomagnetite in the ore liquid is preferably removed before being fed into the separation channel 3. When the ore liquid containing micro-fine ilmenite and gangue is fed into the separation channel 3 from the feed inlet 5, the ore feeding flow rate is controlled. The volume concentration of the ore liquid fed into the separation channel 3 is generally higher than 30%, but the ore feeding concentration should not be too high. The volume concentration of the ore liquid flowing out from the overflow outlet is lower than 10%. After the recovery of ilmenite is completed, the feed inlet 5 is closed to stop ore feeding. The water inlet 7 continues to feed water to flush the separation channel 3. After a period of operation, the water inlet 7 is closed, and the opening degree adjusting device 4 is used to increase the underflow outlet to flush the remaining ore into the underflow outlet and discharge it.

Claims

1. A magnetic field-enhanced recovery device for fine-grained ilmenite, characterized in that: Includes a shell (1) and inclined plates (2) installed inside the shell (1). The shell (1) is made of non-magnetic material and has an inner cavity in the shape of an oblique quadrangular prism. The upper and lower bases of the oblique quadrangular prism correspond to the upper and lower ends of the shell (1), respectively. At least two inclined plates (2) are fixed in the inner cavity of the shell (1). Each inclined plate (2) is a rectangular plate and is the same. The large surface of each inclined plate (2) is parallel to the rectangular side surface of the oblique quadrangular prism. The inclined plates (2) are arranged at equal intervals. The two sides of each inclined plate (2) are sealed to the inner wall of the shell (1). Each inclined plate (2) has a double-layer structure, consisting of an upper layer (2-1) of non-magnetic material and a lower layer (2-2) of magnetic material. The upper surface of the upper layer (2-1) and the lower layer (2-2) are sealed together. The lower surface of 2-2) is flat, and the upper surface of the lower layer (2-2) is provided with continuous or intermittent sharp teeth; a sorting channel (3) is formed between two adjacent inclined plates (2), and the upper and lower ends of the sorting channel (3) are the overflow outlet and the underflow outlet, respectively. An opening adjustment device (4) is also provided at the underflow outlet. Each sorting channel (3) is provided with a feed inlet (5) and a water inlet (7). The feed inlet (5) is opened in the shell (1) and located between the overflow outlet and the underflow outlet. The water inlet (7) is opened in the shell (1) and located between the feed inlet (5) and the underflow outlet. Magnetic field generators (6) are respectively set on the two sides corresponding to the two rectangular sides of the inclined quadrangular prism. The S-stage and N-stage of the two magnetic field generators (6) are arranged opposite to each other.

2. The magnetic field-enhanced recovery device for fine-grained ilmenite as described in claim 1, characterized in that: Each sorting channel (3) is equipped with a rinsing port, which is opened in the housing (1) and located at each opening adjustment device (4).

3. The magnetic field-enhanced recovery device for fine-grained ilmenite as described in claim 1, characterized in that: An annular overflow trough (8) is provided around the upper end of the shell (1), and a liquid collection trough (9) is provided at the bottom of the shell (1). Each underflow outlet is connected to the liquid collection trough (9).

4. The magnetic field-enhanced recovery device for fine-grained ilmenite as described in claim 1, characterized in that: Each feed inlet (5) of the housing (1) is connected to a feeding pipe at one end within the sorting channel (3). The axis of the feeding pipe is parallel to the upper and lower bottom surfaces of the oblique quadrangular prism corresponding to the inner cavity of the housing (1). The axis of the feeding pipe is also parallel to the plane corresponding to the inclined plate (2). The length of the feeding pipe is equal to the distance between the two parallelogram sides of the oblique quadrangular prism corresponding to the inner cavity of the housing (1). The feeding pipe has multiple discharge holes on the side facing the overflow outlet or a discharge trough on the side facing the overflow outlet.

5. The magnetic field-enhanced recovery device for fine-grained ilmenite as described in claim 1, characterized in that: The lower layer (2-2) of the inclined plate (2) is made of paramagnetic material or ferromagnetic material, and the upper layer (2-1) of the shell (1) and the inclined plate (2) is made of plastic. The magnetic field generator (6) is a permanent magnet or electromagnet.

6. The magnetic field-enhanced recovery device for fine-grained ilmenite as described in any one of claims 1 to 5, characterized in that: The upper surface of the lower layer (2-2) of the inclined plate (2) is stepped, and the tread of the step is parallel to the upper and lower bottom surfaces of the oblique quadrangular prism corresponding to the inner cavity of the shell (1); or, the upper surface of the lower layer (2-2) of the inclined plate (2) is provided with staggered pointed cones.

7. The magnetic field-enhanced recovery device for fine-grained ilmenite as described in any one of claims 1 to 5, characterized in that: The shapes of the lower surface of the upper layer (2-1) and the upper surface of the lower layer (2-2) of the inclined plate (2) match each other.

8. The magnetic field-enhanced recovery device for fine-grained ilmenite as described in any one of claims 1 to 5, characterized in that: The upper layer (2-1) of the inclined plate (2) is integral or fixedly connected to the shell (1), and the lower layer (2-2) of the inclined plate (2) is fixed to the upper layer (2-1) of the inclined plate (2).

9. A magnetic field-enhanced method for the recovery of fine-grained ilmenite, characterized in that: To recover ilmenite using the magnetic field enhanced recovery device for fine-grained ilmenite as described in any one of claims 1 to 8, firstly, the magnetic field generator (6) is turned on, and clean water is introduced into the sorting channel (3) through the water inlet (7). The clean water flows laminarly in the sorting channel (3) and flows out from the overflow outlet and the bottom outlet of the sorting channel (3). Then, the slurry containing fine-grained ilmenite and gangue is sent into the sorting channel (3) from the feed inlet (5). The fine-grained ilmenite sinks to the bottom outlet, and finally, the sediment flowing out from the bottom outlet is collected.

10. The method for magnetic field-enhanced recovery of fine-grained ilmenite as described in claim 9, characterized in that: The mineral solution first removes titanium magnetite from the mineral solution and then sends it into the sorting channel (3). The volume concentration of the mineral solution sent into the sorting channel (3) is higher than 30%, the volume concentration of the mineral solution flowing out from the overflow outlet is lower than 10%, and the volume concentration of the sediment is higher than 50%.

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