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

Abstract

The invention discloses a micro-fine fraction ilmenite magnetic field strengthening recovery device and method, relates to the field of magnetic separation for separating solid materials from fluid, solves the problem that micro-fine fraction ilmenite and gangue ore are difficult to separate, and adopts the technical scheme that the micro-fine fraction ilmenite magnetic field strengthening recovery device comprises a shell and an inclined plate, the shell is provided with an inner cavity in an inclined quadrangular prism shape, at least two inclined plates are fixed in the inner cavity of the shell, each inclined plate is of a double-layer structure, the double-layer structure comprises an upper layer and a lower layer, and continuous or discontinuous sharp teeth are arranged on the upper surface of the lower layer; a separation channel is formed between every two adjacent inclined plates, the upper ends and the lower ends of the separation channels are overflow outlets and underflow outlets, opening adjusting devices are arranged at the underflow outlets, 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 sharp teeth on the lower layer of the inclined plate are used for forming a magnetic field strengthening area in the separation channel, the stress and the movement direction of ore grains are changed, and the purpose of separating ilmenite and gangue ore is achieved.

Description

Technical Field

[0001] The invention relates to the field of magnetic separation and gravity separation for separating solid materials with different magnetic properties and specific gravities from fluids, and in particular to a device and method for recovering fine-grained ilmenite by strengthening a magnetic field. Background Art

[0002] The vanadium-titanium magnetite in the Panzhihua area is an important strategic resource of iron, vanadium and titanium in my country. The main valuable minerals in the ore are ilmenite and titanomagnetite, and the main gangue minerals are pyroxene, feldspar, olivine, amphibole and its altered minerals. Ilmenite and other associated minerals have certain differences in various physical and chemical properties such as magnetism, specific gravity, wettability, and electrical properties. The main mineral processing processes for recovering ilmenite include magnetic separation-flotation, magnetic separation-gravity separation-flotation, and gravity separation-magnetic separation. The equipment used for magnetic separation and gravity separation is mainly high-gradient magnetic separator and spiral chute, which are suitable for ilmenite pre-enrichment.

[0003] The tailings produced by the existing mineral processing technology contain a large amount of fine-grained ilmenite with a particle size of less than 38μm. The particle size of the fine-grained ilmenite is small, and the existing mineral processing technology and corresponding equipment have poor recovery capabilities for the fine-grained ilmenite. Summary of the invention

[0004] The present invention firstly provides a device for recovering fine-grained ilmenite by magnetic field enhancement, which solves the problem that the existing magnetic separation equipment is difficult to separate fine-grained ilmenite from gangue ore.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a fine-grained ilmenite magnetic field enhancement recovery device comprises a shell and an inclined plate installed in the shell, the shell is made of non-magnetic material, the shell has an inner cavity in the shape of an oblique quadrangular prism, the upper and lower bottom surfaces of the oblique 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 oblique quadrangular prism, each inclined plate is arranged at equal intervals, the two side surfaces of each inclined plate are sealed with the inner wall of the shell, and each inclined plate is a double-layer structure, the double-layer structure is respectively an upper layer of non-magnetic material and a magnetic The lower layer of the material, the upper surface of the upper layer and the lower surface of the lower layer are all flat surfaces, and the upper surface of the lower layer is provided with continuous or discontinuous sharp teeth; a sorting channel is formed between two adjacent inclined plates, the upper and lower ends of the sorting channel are respectively an overflow outlet and an underflow outlet, and an opening adjustment device is also provided at the underflow outlet, each sorting channel is provided with a feed port and a water inlet, the feed port is opened in the shell and is located between the overflow outlet and the underflow outlet, and the water inlet is opened in the shell and is located between the feed port and the underflow outlet; magnetic field generators are respectively arranged on the two sides corresponding to the two rectangular sides of the shell and the oblique quadrangular prism, and the S level and N level of the two magnetic field generators are arranged relatively.

[0006] The thickness of the sorting channel (the net distance between two adjacent inclined plates) is small, and there is a risk of the sorting channel being blocked. In order to facilitate rapid 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 adjustment device.

[0007] In order to collect the overflow liquid from each overflow outlet, further: an annular overflow groove is arranged around the upper end of the shell. In order to collect the underflow liquid from each underflow outlet, further: a liquid collecting groove is arranged at the bottom of the shell, and each underflow outlet is connected to the liquid collecting groove.

[0008] In order to ensure that the ore liquid can be quickly and evenly distributed and laminar after entering the sorting channel, further: each feed port of the shell is located at one end of the sorting channel connected to a distribution pipe, the axis of the distribution pipe is parallel to the upper and lower bottom surfaces of the oblique quadrangular prism corresponding to the inner cavity of the shell, the axis of the distribution pipe is also parallel to the plane corresponding to the inclined plate, the length of the distribution pipe is equal to the distance between the two parallelogram sides of the oblique quadrangular prism corresponding to the inner cavity of the shell, and a plurality of discharge holes are provided on the side of the distribution pipe facing the overflow outlet, or a discharge trough is provided on the side of the distribution pipe facing the overflow outlet.

[0009] The lower layer of the inclined plate is a magnetic material, that is, the lower layer is a magnetizable material. For example, the material of the lower layer of the inclined plate is a paramagnetic field material or a ferromagnetic material. The upper layers of the shell and the inclined plate are both non-magnetic materials. For example, the upper layers of the shell and 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 sharp teeth of the lower layer of the inclined plate form a magnetic field strengthening zone in the sorting channel, changing the force and movement direction of the fine-grained ilmenite. Specifically: the upper surface of the lower layer of the inclined plate 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; or, the upper surface of the lower layer of the inclined plate is provided with staggered pointed cones.

[0012] In order to avoid 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 shapes of the lower surface of the upper layer of the inclined plate and the upper surface of the lower layer match each other.

[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 whole or fixedly connected, and the lower layer of the inclined plate is fixed to the upper layer of the inclined plate.

[0014] The present invention provides a method for recovering fine-grained ilmenite by magnetic field enhancement, which solves the problem that fine-grained ilmenite and gangue ore are difficult to separate. The method for recovering fine-grained ilmenite by magnetic field enhancement, using any of the above-mentioned fine-grained ilmenite magnetic field enhancement recovery devices to recover ilmenite, firstly turning on the magnetic field generator, and introducing clean water into the sorting channel through the water inlet, the clean water flows in the sorting channel in a laminar manner and flows out from the overflow outlet and the bottom flow outlet of the sorting channel, then the ore liquid containing fine-grained ilmenite and gangue ore is fed into the sorting channel from the feed inlet, the fine-grained ilmenite sinks to the bottom flow outlet, and finally the sediment flowing out from the bottom flow outlet is collected.

[0015] In order to avoid the separation channel from being blocked, further steps are as follows: the titanomagnetite in the ore liquid is firstly removed, and then the ore liquid is fed into the separation channel.

[0016] In order to better control the mineral processing process, further: the volume concentration of the mineral solution fed into the separation channel is higher than 30%, the volume concentration of the mineral solution flowing out of the overflow outlet is lower than 10%, and the volume concentration of the sediment is higher than 50%.

[0017] In order to facilitate the collection of fine-grained ilmenite, further, the volume concentration of the sediment flowing out from the bottom flow outlet is higher than 50%.

[0018] The beneficial effects of the present invention are as follows: the upper surface of the inclined plate (i.e. the upper surface of the upper layer) and the lower surface (i.e. the lower surface of the lower layer) are both flat surfaces, that is, the upper and lower sides of the sorting channel are both flat surfaces, the inclined plates are parallel to each other and arranged at equal intervals, and a sorting channel is formed between two adjacent inclined plates. The thickness of the sorting channel (the net distance between two adjacent inclined plates) is small and the thickness is consistent everywhere. After the ore liquid enters the sorting channel from the feed port, it is dispersed in a stable laminar flow, and the laminar flow velocity increases as it is farther away from the inclined plate, and the sorting channel eliminates the influence of turbulence. The upper layer of the inclined plate is made of non-magnetic material, the lower layer of the inclined plate is made of magnetic material and has continuous or intermittent sharp teeth on the upper surface. The magnetic field generator magnetizes the lower layer of the inclined plate, thereby enhancing the magnetic field strength on the lower side of the sorting channel near the sharp teeth. The magnetic field is a gradient magnetic field, and the direction of magnetic field change is perpendicular to the slurry flow direction in the sorting channel. The gradient magnetic field is used as an enhanced separation measure. Different from general high-strength magnetic separators that resist the impact force of high-velocity water flow through adsorption, the water flow velocity in the present invention is slower, the required magnetic field strength is weaker, the equipment cost is low, and the operating energy consumption is small. Fine-grained ilmenite has the characteristics of greater specific magnetic susceptibility and greater specific gravity than gangue ore. Under the combined action of magnetic field and gravity, ilmenite has a greater component force of the inclined plate downward, so it has a faster sedimentation speed. The ilmenite and gangue ore are subjected to different forces and movement directions in the sorting channel. Most of the gangue ore flows out from the overflow outlet at the upper end of the sorting channel, while the ilmenite flows out from the bottom flow outlet at the lower end of the sorting channel, and finally the ilmenite and gangue ore are sorted, and the sorting efficiency is high. The present invention separates solid materials with different magnetic properties and specific gravities from the fluid, adopts the method of magnetic separation and gravity separation, can effectively enrich the fine-grained ilmenite lost in the tailings, and improves the comprehensive utilization efficiency of vanadium-titanium magnetite. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a magnetic field enhancement recovery device for fine-grained ilmenite of the present invention.

[0020] Figure 2 yes Figure 1 The illustrated embodiment is a schematic structural diagram of a longitudinal section perpendicular to the inclined plate.

[0021] Figure 3 yes Figure 2 Enlarged view of the lower part.

[0022] Figure 4 yes Figure 2 Schematic diagram of flow velocity, magnetic field and movement trajectory of mineral particles in the sorting channel.

[0023] Figure numerals: shell 1, inclined plate 2, upper layer 2-1, lower layer 2-2, sorting channel 3, opening adjustment device 4, feed port 5, magnetic field generator 6, water inlet 7, overflow tank 8, liquid collecting tank 9, velocity distribution diagram 10, magnetic field distribution diagram 11, ilmenite movement trajectory 12, gangue ore movement trajectory 13. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] The first subject of the present invention is a device for recovering fine-grained ilmenite by magnetic field enhancement. Figure 1 As shown, the magnetic field enhancement recovery device for fine-grained ilmenite includes a shell 1 and an inclined plate 2 installed in the shell 1. The shell 1 is a non-magnetic material, that is, the shell 1 is a material that cannot be magnetized, such as plastic or a metal that cannot be magnetized. The shell 1 has an inner cavity in the shape of an oblique quadrangular prism, and the upper and lower bottom surfaces 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 and arranged relative to each other, and two are parallelogram sides and arranged relative to each other. If the upper and lower bottom surfaces of the oblique quadrangular prism corresponding to the inner cavity of the shell 1 are set horizontally, the rectangular side of the oblique quadrangular prism is arranged obliquely, and the parallelogram side of the oblique quadrangular prism is arranged vertically. At least two inclined plates 2 are fixed in the inner cavity of the shell 1, and each inclined plate 2 is a rectangular plate and the same. The same of each inclined plate 2 means the same shape, the same structure, and the same material. The large 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 obliquely, wherein the large surface of the inclined plate 2 refers to the surface with the largest surface area of ​​the inclined plate 2. Each inclined plate 2 is arranged at equal intervals, and each inclined plate 2 is parallel to each other, and the interval between any two adjacent inclined plates 2 is equal. A sorting channel 3 is formed between two adjacent inclined plates 2, and each sorting channel 3 has an equal thickness, that is, the net interval between two adjacent inclined plates 2 is equal. Both sides of each inclined plate 2 are sealed with the inner wall of the housing 1, and the two sides of the inclined plate 2 are specifically sealed with the inner walls corresponding to the two parallelogram sides of the oblique quadrangular prism.

[0026] Each inclined plate 2 is a double-layer structure, and the double-layer structure is 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 both flat surfaces, so that the two large surfaces of the inclined plate 2 are both flat surfaces. The lower layer 2-2 of the inclined plate 2 is a magnetic material, that is, the lower layer 2-2 is a magnetizable material. For example, the material of the lower layer 2-2 of the inclined plate 2 is a paramagnetic field material or a ferromagnetic material. The upper layer 2-1 of the inclined plate 2 is a non-magnetic material. For example, the upper layer 2-1 of the inclined plate 2 is plastic or a metal that cannot be magnetized. The lower surface of the upper layer 2-1 is attached to the lower surface of the upper layer and remains 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 a flat surface, 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 in 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 the mineral liquid from entering the cavity between the upper layer 2-1 and the lower layer 2-2 of the inclined plate 2, 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 are preferably matched with each other, that is, 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 a whole or fixedly connected.

[0027] A sorting channel 3 is formed between two adjacent inclined plates 2, and the upper and lower ends of the sorting channel 3 are an overflow outlet and an underflow outlet, respectively. In order to facilitate the collection of overflow liquid overflowing from each overflow outlet, an annular overflow trough 8 is also arranged around the upper end of the shell 1, and the overflow liquid of each sorting channel 3 enters the overflow trough 8. In order to facilitate the collection of underflow liquid flowing out of each underflow outlet, a liquid collecting trough 9 is arranged at the bottom of the shell 1, and each underflow outlet is connected to the liquid collecting trough 9. For example, a bucket-shaped liquid collecting trough 9 is arranged at the bottom of the shell 1, and the underflow liquid of each sorting channel 3 flows into the bucket-shaped liquid collecting trough 9. An opening adjustment device 4 is arranged at the underflow outlet, and the opening adjustment device 4 is used to adjust the size of the underflow outlet. For example, the opening adjustment device 4 is an adjustment plate rotatably mounted on the overflow outlet. The bottom flow outlet of the sorting channel 3 is rectangular, and the width of the rectangle is the thickness of the sorting channel 3, that is, the width of the rectangle is the net distance between two adjacent inclined plates 2. The opening adjustment device 4 is only used to adjust the width of the rectangle corresponding to the bottom flow outlet, and the opening adjustment device 4 does not change the length of the rectangle corresponding to the bottom flow outlet.

[0028] Each sorting channel 3 is provided with a feed port 5 and a water inlet 7. The feed port 5 is used for the ore liquid to enter the sorting channel 3. The feed port 5 is opened in the shell 1 and is located between the overflow outlet and the bottom flow outlet. The feed port 5 is generally set at the lower middle part of the shell 1. The water inlet 7 is used to introduce clean water into the sorting channel 3 before the ore dressing, and form a laminar flow of water at the upper and lower ends of the sorting channel 3 to prepare for the ore liquid to enter the sorting channel 3. The water inlet 7 is opened in the shell 1 and is located between the feed port 5 and the bottom flow outlet. In order to ensure that the ore liquid can be quickly and evenly distributed in the sorting channel 3 and laminarly flow after entering the sorting channel 3, each feed port 5 of the shell 1 is located in the sorting channel 3. One end is connected to a distribution pipe, the axis of the distribution pipe is parallel to the upper and lower bottom surfaces of the oblique quadrangular prism corresponding to the inner cavity of the shell 1, and the axis of the distribution pipe is also parallel to the plane corresponding to the inclined plate 2. The length of the distribution pipe is equal to the distance between the two parallelogram sides of the oblique quadrangular prism corresponding to the inner cavity of the shell 1, and a plurality of discharge holes are provided on the side of the distribution pipe facing the overflow outlet, or a discharge trough is provided on the side of the distribution pipe facing the overflow outlet. In order to enable clean water to quickly form laminar flow after entering the sorting channel 3 through the water inlet 7, each water inlet 7 of the shell 1 is connected to a distribution pipe at one end located in the sorting channel 3, and the axis of the distribution pipe is parallel to the upper and lower bottom surfaces of the oblique quadrangular prism corresponding to the inner cavity of the shell 1. The axis of the distribution pipe is also parallel to the plane corresponding to the inclined plate 2. The length of the distribution pipe is equal to the distance between the two parallelogram sides of the oblique quadrangular prism corresponding to the inner cavity of the shell 1. A plurality of discharge holes are provided on the side of the distribution pipe facing the overflow outlet, or a discharge trough is provided on the side of the distribution pipe facing the overflow outlet.

[0029] The thickness of the sorting channel 3 is small, and there is a risk of the sorting channel 3 being blocked, especially the risk of the bottom flow outlet at the lower end of the sorting channel 3 being blocked is relatively large. In order to facilitate the rapid unblocking of the sorting channel 3 when it is blocked, each sorting channel 3 is provided with a flushing port, which is opened in the shell 1 and located at each opening adjustment device 4. Flushing water can directly enter the sorting channel 3 from the flushing port. Since the bottom flow outlet of the sorting channel 3 is rectangular, in order to improve the flushing efficiency, each flushing port of the shell 1 is located at one end of the sorting channel 3 connected to the water inlet pipe, the axis of the water inlet pipe is parallel to the upper and lower bottom surfaces of the oblique quadrangular prism corresponding to the inner cavity of the shell 1, the axis of the water inlet pipe is also parallel to the plane corresponding to the inclined plate 2, the length of the water inlet pipe is equal to the distance between the two parallelogram sides of the oblique quadrangular prism corresponding to the inner cavity of the shell 1, and the side of the water inlet pipe facing the bottom flow outlet is provided with multiple water outlet holes or the side of the water inlet pipe facing the bottom flow outlet is provided with a water outlet trough, so that the flushing water can flush the bottom flow outlet in a jetting manner. After the mineral processing is completed, the flushing port can also be used to clean the sorting channel 3. The material 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] Magnetic field generators 6 are respectively arranged on the two sides of the shell 1 corresponding to the two rectangular sides of the oblique quadrangular prism, and the S level and N level of the two magnetic field generators 6 are arranged relatively. The magnetic field generator 6 is an object or device that can generate 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 discontinuous sharp teeth, and the sharp teeth are long strips or staggered pointed cones. For example, the upper surface of the lower layer 2-2 of the inclined plate 2 is in the shape of steps, and the treads of the steps are 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. 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 intensity is relatively high near the lower layer 2-2 of the inclined plate 2, such as Figure 4 shown.

[0031] The mineral particles (including ilmenite and gangue ore) are acted upon by four forces in the sorting channel 3, namely gravity, buoyancy, viscous resistance and magnetic force. Among them, the direction of gravity is vertically upward, the direction of buoyancy is vertically upward, the magnitude of gravity and buoyancy is fixed and the direction of the combined force is vertically downward. The viscous resistance is affected by the relative speed difference between the mineral particles and the water flow, and the direction is opposite to the relative movement direction. The magnitude of the magnetic force is affected by the magnetic field gradient, extending along the magnetic induction line and toward the direction of the dense magnetic induction line. When the mineral particles just enter the sorting channel 3, the resultant force of the four forces of gravity, buoyancy, viscous resistance and magnetic force on the mineral particles in the direction perpendicular to the upper surface of the inclined plate 2 is not zero. The ilmenite with the same particle size and the same initial velocity has a larger component of force in this direction than the gangue, and therefore has a greater acceleration in this direction. The ilmenite will be closer to the lower wall of the sorting channel 3 (the upper surface of the inclined plate 2) than the gangue entering the sorting channel 3 at the same time. Since the water flow velocity near the lower wall of the sorting channel 3 is small, the ilmenite encounters little resistance and therefore begins to move downward and eventually enters the bottom flow outlet of the sorting channel 3. The gangue ore requires a longer inclined plate length to flow into the bottom flow outlet. When the inclined plate length is reduced, the gangue ore will enter the overflow outlet. The velocity distribution, magnetic field distribution, ilmenite movement trajectory, and gangue ore movement trajectory in the sorting channel 3 are shown in the figure. Figure 4 The present invention utilizes the sharp teeth of the lower layer 2-2 of the inclined plate 2 to form a magnetic field strengthening zone in the separation channel 3, thereby changing the force and movement direction of the fine-grained ore particles, thereby achieving the purpose of separating ilmenite and gangue ore.

[0032] The second subject of the present invention is a method for recovering fine-grained ilmenite by magnetic field enhancement. The method for recovering fine-grained ilmenite by magnetic field enhancement is to recover ilmenite by using the device for recovering fine-grained ilmenite by magnetic field enhancement described in the first subject. First, 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 in the sorting channel 3 in a laminar manner and flows out from the overflow outlet and the bottom flow outlet of the sorting channel 3. Then, the ore liquid containing fine-grained ilmenite and gangue ore is fed into the sorting channel 3 from the feed port 5. The fine-grained ilmenite sinks to the bottom flow outlet, and finally the sediment flowing out from the bottom flow outlet is collected. The sediment is actually the ore pulp that has been sorted out. The sediment is mainly the ore pulp of titanomagnetite and ilmenite. Generally, the volume concentration of the sediment is controlled to be higher than 50%. For the sorted sediment, the grade of the ilmenite can be improved by multiple selection according to the method for recovering fine-grained ilmenite by magnetic field enhancement of the present invention.

[0033] Before recovering ilmenite, first open the water inlet 7 and adjust the water inlet pressure, and at the same time adjust the opening adjustment device at the bottom flow outlet to ensure that the flow of the overflow outlet and the bottom flow outlet is at a suitable value, wherein the flow of the bottom flow outlet should be as small as possible, as long as it is guaranteed not to be blocked, and the flow size of the overflow outlet should ensure that a laminar flow is formed inside the sorting channel 3, and the flow rate is appropriate, and the flow rate matches the mineral particle size and density. At the same time, after turning on the magnetic field generator 6, the permanent magnet spacing or the electromagnet current size is adjusted to a suitable value. Since the titanomagnetite in the ore liquid is easily adsorbed on the inclined plate 2, which leads to the blockage of the sorting channel 3, in order to avoid the blockage of the sorting channel 3, the ore liquid is preferably first removed from the titanomagnetite in the ore liquid, and then sent to the sorting channel 3. When the ore liquid containing fine-grained ilmenite and gangue ore is sent to the sorting channel 3 from the feed port 5, it is important to control the feed flow rate. The volume concentration of the ore liquid sent to the sorting channel 3 is generally higher than 30%, but the feed concentration should not be too high. The volume concentration of the ore liquid flowing out of the overflow outlet is less than 10%. After the recovery of ilmenite is completed, the feed port 5 is closed to stop feeding ore, and the water inlet 7 continues to feed water to flush the sorting channel 3. After running for a period of time, the water inlet 7 is closed, and the opening adjustment device 4 is used to increase the underflow outlet to flush the residual ore into the underflow outlet for discharge.

Claims

1. A magnetic field enhanced recovery device for fine-grained ilmenite, characterized in that: The invention comprises a shell (1) and an inclined plate (2) installed in the shell (1), wherein the shell (1) is made of non-magnetic material, and the shell (1) has an inner cavity in the shape of an oblique quadrangular prism, wherein the upper and lower bottom surfaces of the oblique quadrangular prism correspond to the upper and lower ends of the shell (1), respectively, and at least two inclined plates (2) are fixed in the inner cavity of the shell (1), wherein each inclined plate (2) is a rectangular plate and is identical, wherein the large surface of each inclined plate (2) is parallel to the rectangular side surface of the oblique quadrangular prism, wherein each inclined plate (2) is arranged at equal intervals, wherein the two side surfaces of each inclined plate (2) are sealed with the inner wall of the shell (1), and each inclined plate (2) is a double-layer structure, wherein the double-layer structure comprises an upper layer (2-1) of non-magnetic material and a lower layer (2-2) of magnetic material, wherein the upper surface of the upper layer (2-1) and the lower layer (2-2) are respectively provided on the upper surface of the upper layer (2-1) and the lower layer (2-2) of the magnetic material. The lower surfaces of the lower layer (2-2) are all flat surfaces, and the upper surface of the lower layer (2-2) is provided with continuous or discontinuous sharp teeth; a sorting channel (3) is formed between two adjacent inclined plates (2), the upper and lower ends of the sorting channel (3) are respectively an overflow outlet and an underflow outlet, and an opening adjustment device (4) is also provided at the underflow outlet; each sorting channel (3) is provided with a feed port (5) and a water inlet (7), the feed port (5) is opened in the shell (1) and is located between the overflow outlet and the underflow outlet, and the water inlet (7) is opened in the shell (1) and is located between the feed port (5) and the underflow outlet; 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 N level of the two magnetic field generators (6) are arranged relatively.

2. The device for recovering fine-grained ilmenite by magnetic field enhancement according to claim 1, characterized in that: Each sorting channel (3) is provided with a flushing port, which is opened in the housing (1) and located at each opening adjustment device (4).

3. The device for recovering fine-grained ilmenite by magnetic field enhancement according to claim 1, characterized in that: An annular overflow groove (8) is also arranged around the upper end of the shell (1), and a liquid collecting groove (9) is arranged at the bottom of the shell (1), and each bottom flow outlet is communicated with the liquid collecting groove (9).

4. The magnetic field enhanced recovery device for fine-grained ilmenite according to claim 1, characterized in that: One end of each feed port (5) of the shell (1) located in the sorting channel (3) is connected to a distribution pipe, the axis of the distribution pipe is parallel to the upper and lower bottom surfaces of the oblique quadrangular prism corresponding to the inner cavity of the shell (1), the axis of the distribution pipe is also parallel to the plane corresponding to the inclined plate (2), the length of the distribution pipe is equal to the distance between the two parallelogram side surfaces of the oblique quadrangular prism corresponding to the inner cavity of the shell (1), and a plurality of discharge holes are provided on the side of the distribution pipe facing the overflow outlet, or a discharge trough is provided on the side of the distribution pipe facing the overflow outlet.

5. The device for recovering fine-grained ilmenite by magnetic field enhancement according to claim 1, characterized in that: The material of the lower layer (2-2) of the inclined plate (2) is a paramagnetic field material or a ferromagnetic material, the shell (1) and the upper layer (2-1) of the inclined plate (2) are both plastic, and the magnetic field generator (6) is a permanent magnet or an electromagnet.

6. The device for recovering fine-grained ilmenite by magnetic field enhancement according to 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 in the shape of a step, 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 device for recovering fine-grained ilmenite by magnetic field enhancement according to 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 device for recovering fine-grained ilmenite by magnetic field enhancement according to any one of claims 1 to 5, characterized in that: The upper layer (2-1) of the inclined plate (2) and the shell (1) are integrally formed or fixedly connected, 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 method for recovering fine-grained ilmenite by magnetic field enhancement, characterized in that: The ilmenite is recovered by using the fine-grained ilmenite magnetic field enhancement recovery device as described in any one of claims 1 to 8. First, 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 in the sorting channel (3) in a laminar manner and flows out from the overflow outlet and the bottom flow outlet of the sorting channel (3). Then, the ore liquid containing fine-grained ilmenite and gangue ore is fed into the sorting channel (3) from the feed inlet (5). The fine-grained ilmenite sinks to the bottom flow outlet, and finally the sediment flowing out from the bottom flow outlet is collected.

10. The method for recovering fine-grained ilmenite by magnetic field enhancement according to claim 9, characterized in that: Titanomagnetite is first removed from the ore liquid and then sent to the sorting channel (3). The volume concentration of the ore liquid sent to the sorting channel (3) 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 sediment is higher than 50%.

Images