High-pressure high-gradient magnetic separator and magnetic separation method thereof

Abstract

The invention provides a high-pressure high-gradient magnetic separator and a magnetic separation method thereof, and relates to the technical field of magnetic separation. The exciting coil is embedded into the inner wall of the inner cavity of the magnet yoke; the high-pressure separation cavity comprises an outer cylinder body, an inner cylinder body and a magnetic medium, the outer cylinder body is fixedly arranged in the inner cavity, the inner cylinder body is embedded into the outer cylinder body in a sliding mode, and the magnetic medium is arranged in the inner cylinder body; and the ore feeding, water feeding and gas feeding device is communicated with the inner barrel through a pipeline, is used for inputting to-be-magnetically separated ore pulp containing high-pressure gas into the inner barrel, and can be connected with the discharging container for circulating high-pressure magnetic separation. The high-gradient magnetic separation device can be used for developing high-gradient magnetic separation test research under the high-pressure condition, liquid-solid ore pulp in a traditional magnetic separation cavity is changed into high-pressure gas-liquid-solid mutual soluble ore pulp, and the adsorption effect among particles under the high-gradient magnetic field effect is weakened through Van der Waals repulsive force of high-pressure gas dissolved in the high-pressure gas-liquid-solid mutual soluble ore pulp; the method can be used for efficient separation of micro-fine particle level weak magnetic minerals.

Description

Technical Field

[0001] The present invention relates to the field of magnetic separation technology, and in particular to a high-pressure high-gradient magnetic separator and a magnetic separation method thereof. Background Art

[0002] High gradient magnetic separator is one of the common methods used to purify and remove iron or separate iron-containing minerals from non-metallic minerals, metal minerals and solid waste resources such as kaolin, hematite, and red mud. However, there are a large number of low-grade and difficult-to-purify mineral resources at home and abroad. The main reason for the difficulty in purification is that the strong adsorption force at the interface between non-magnetic minerals and magnetic minerals in the fine-grained mineral particles makes them easy to agglomerate when flowing in the magnetic separation cavity, resulting in a large amount of entrainment loss on the magnetic medium steel wool.

[0003] It is well known that the specific surface area, surface energy and activity of mineral particles will increase as the size of the mineral decreases. Especially when the mineral particles are smaller than the micron scale, the interfacial adsorption strength between the particles will be greatly enhanced, which will make it difficult to separate the magnetic particles during the magnetic separation process. During the magnetic separation process, the magnetic particles in the slurry are mainly affected by the adsorption force between the particles, the adsorption force between the particles and the magnetic medium, the fluid impact force of the slurry liquid and various surface tensions. Among them, the interfacial adsorption force between the particles, such as the double-layer electrostatic force and hydrogen bonding, will increase significantly as the size of the mineral particles decreases, resulting in serious agglomeration between the particles.

[0004] In recent years, new magnetic separators have been developed at home and abroad to solve the problem of magnetic separation of fine-grained mineral particles, such as pulsating high-gradient magnetic separators (patents CN1010832B, CN102614983B, CN112452535B, CN113976313A), ultrasonic-assisted high-gradient magnetic separators (patent CN202538920U), ultrasonic pulsating high-gradient magnetic separators (patent CN116159668A), and centrifugal high-gradient magnetic separators (patent CN111558456B). However, generally speaking, fine-grained impurities smaller than 2 microns have the characteristics of high surface energy and fast particle adsorption, and tend to agglomerate within seconds in the slurry system. At present, the commonly used pulsating high-gradient magnetic separators use pulsating mechanisms to apply periodic pulsating vibration force fields in the magnetic field to reduce the blockage of magnetic media and promote the separation of magnetic particles. Although they can reduce the agglomeration of large particles in the slurry and have been successful in separating magnetic particles with a particle size greater than 400 mesh, they still cannot solve the problem of entrainment of fine impurities less than 2 microns. Similarly, ultrasonic magnetic separators can promote the dispersion of slurry through ultrasonic dispersion pretreatment, but they cannot avoid the agglomeration problem of slurry after it leaves the ultrasonic field and enters the magnetic separation chamber.

[0005] In addition, patents CN 112439542 A and CN 112657671 A also disclose high-temperature, high-pressure, high-gradient magnetic separators for liquid-solid magnetic separation in the chemical industry, and found that backwashing the magnetic medium with gas and / or flushing liquid can improve the removal rate of magnetic particles, and introducing an ultrasonic transmitter in the magnetic cavity can greatly improve the separation efficiency. However, experiments have shown that the increase in pressure of this type of magnetic separator under high temperature and high pressure conditions cannot solve the problem of entrainment of fine-grained impurities less than 2 microns.

[0006] Therefore, the current high-gradient magnetic separators are still unable to solve the problem of separating fine-grained weakly magnetic minerals with strong adsorption behavior. It is urgent to solve the problem of entrainment of magnetic mineral particles and non-magnetic mineral particles during the magnetic separation process in order to achieve efficient separation. Summary of the invention

[0007] In view of this, in order to solve the problem of separating fine-grained weak magnetic minerals with strong adsorption behavior caused by the strong adsorption force at the interface between non-magnetic minerals and magnetic minerals in fine-grained mineral particles, the present invention provides a high-pressure high-gradient magnetic separator, which promotes the efficient separation of fine-grained weak magnetic minerals through the coupling of the repulsive force between solid particles inside the high-pressure gas-liquid-solid miscible slurry in the high-pressure separation chamber and the high-gradient magnetic field force.

[0008] An embodiment of the present invention provides a high-pressure high-gradient magnetic separator, comprising a high-pressure separation chamber, an ore-feeding, water-feeding and air-feeding device, a frame, a magnetic yoke, an exciting coil, a magnetic medium and a discharging device;

[0009] A magnetic yoke, which is mounted on the frame and has an annular inner cavity;

[0010] An exciting coil embedded in the inner wall of the inner cavity of the magnetic yoke;

[0011] A high-pressure separation chamber, comprising an outer cylinder and an inner cylinder, wherein the outer cylinder is fixedly arranged in the inner chamber, the inner cylinder is slidably embedded in the outer cylinder, an openable end cover is arranged at the upper end of the inner cylinder, the lower end of the inner cylinder is closed and provided with a discharge port, and the magnetic medium is arranged in the inner cylinder;

[0012] A ore-feeding, water-feeding and air-feeding device, which is connected to the end cover through a pipeline to communicate with the inner cylinder, and is used to input liquid containing high-pressure gas and ore pulp to be magnetically separated containing high-pressure gas into the inner cylinder to convert the liquid-solid ore pulp into a high-pressure gas-liquid-solid miscible ore pulp;

[0013] The inner cylinder of the high-pressure separation chamber is a pressure vessel, which can perform magnetic separation under high-pressure conditions after being magnetized, and utilizes the van der Waals repulsion of the gas inside the slurry to weaken the adsorption between the magnetic particles and the non-magnetic particles in the slurry, so that the magnetic particles are adsorbed and separated by the magnetic medium under the condition of dispersion and homogenization;

[0014] The discharging device is connected to the lower end of the inner cylinder.

[0015] Furthermore, the ore-feeding, water-feeding and gas-feeding device comprises a feed pipe and a pressurizing device, wherein the feed pipe is connected to the end cover, and the pressurizing device is connected to the feed pipe so as to input pressurized gas into the inner cylinder through the feed pipe.

[0016] Furthermore, the pressurizing equipment is a reaction kettle, a booster pump or a high-pressure gas cylinder.

[0017] Furthermore, a first valve is provided on the feed pipe.

[0018] Furthermore, a four-way joint is provided on the feed pipe, and the four-way joint is also connected to a reflux pipe and a flushing pipe. The reflux pipe is connected to the lower end of the inner cylinder, a second valve is provided at one end of the reflux pipe close to the four-way joint, and a third valve is provided on the flushing pipe.

[0019] Furthermore, the discharging device includes a discharging pipe, the discharging pipe is connected to the discharging port, a fourth valve and a three-way joint are provided on the discharging pipe, the three-way joint is connected to the reflux pipe, and a fifth valve is provided at one end of the reflux pipe close to the three-way joint.

[0020] Furthermore, the end cover is a quick-opening flange, and a flange mounting seat is provided at the upper end of the inner cylinder. The quick-opening flange is rotatably connected to the flange mounting seat, and a plurality of rotatable locking bolts are provided on the flange mounting seat. A plurality of fixing grooves are provided on the edge of the quick-opening flange, and each of the locking bolts can be rotated upward to be inserted into a fixing groove and locked by a locking nut.

[0021] In addition, an embodiment of the present invention also provides a magnetic separation method of the above-mentioned high pressure high gradient magnetic separator for purifying clay minerals:

[0022] S1, closing the discharge port, inputting a high-pressure gas-liquid miscible liquid of a predetermined pressure into the inner cylinder through an ore-feeding, water-feeding and gas-feeding device, wherein the high-pressure gas-liquid miscible liquid contains gas soluble in the ore slurry, so that the inner cylinder is filled with the high-pressure gas-liquid miscible liquid;

[0023] S2, starting the excitation coil to make the background magnetic induction intensity in the magnetic yoke reach a predetermined magnetic induction intensity;

[0024] S3, opening the discharge port, inputting the high-pressure gas-liquid-solid miscible ore slurry to be magnetically separated into the inner cylinder through the ore feeding, water feeding and air feeding device, and performing magnetic separation in the inner cylinder under the conditions of a composite force field coupled with a high pressure field containing a gas van der Waals repulsive force, a liquid flow field and a high gradient magnetic field, wherein the composite force field containing a gas van der Waals repulsive force can reduce the adsorption of magnetic particle matter and non-magnetic particle matter, so that the magnetic particle matter is adsorbed and separated by the magnetic medium;

[0025] S4. After the slurry stops flowing out of the high-pressure separation cavity outlet, the outlet is closed to complete a single magnetic separation; or the slurry output from the outlet is repeatedly input into the inner cylinder for cyclic magnetic separation until the required number of magnetic separations is reached.

[0026] Furthermore, the ore-feeding, water-feeding and air-feeding device and related pipelines in S1 can withstand a maximum pressure of 0.8 to 20 MPa, and the inner cylinder can withstand a maximum pressure of 0.8 to 20 MPa.

[0027] Furthermore, in step S3, the material particle size range of the high-pressure gas-liquid-solid solution slurry to be magnetically separated input into the inner cylinder is 0-0.074mm, the slurry concentration is 1-50wt%, the slurry temperature is 0-80°C, and the slurry pressure is 0.8-20Mpa.

[0028] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention are:

[0029] 1. A high-pressure high-gradient magnetic separator and a magnetic separation method thereof of the present invention, wherein an inner cylinder is arranged as a closed magnetic separation space, and a liquid containing high-pressure gas and a slurry to be magnetically separated containing high-pressure gas are inputted. After the high-pressure separation cavity is magnetized, magnetic separation can be performed under high-pressure conditions to convert the liquid-solid slurry into a high-pressure gas-liquid-solid miscible slurry, and the van der Waals repulsion of the gas inside the slurry is utilized to weaken the adsorption between the magnetic particle material and the non-magnetic particle material in the slurry, so that the magnetic particle material is adsorbed and separated by the magnetic medium under the condition of dispersion and homogenization, and the slurry pressure and slurry flow rate are controlled, and a single high-pressure magnetic separation or a cyclic high-pressure magnetic separation process is adopted to realize the efficient separation of the magnetic substance and the non-magnetic substance in the fine-grained mineral particles.

[0030] 2. A high-pressure and high-gradient magnetic separator of the present invention is provided with a quick-opening flange at the upper end of the inner cylinder. The quick-opening flange is easy to open and close, and the magnetic medium in the inner cylinder can be quickly removed and cleaned; and the quick-opening flange is provided with a feed pipe, the feed pipe is connected to the flushing pipe, the feed pipe is provided with a first valve, and the flushing pipe is provided with a third valve, which can be used for the inflow of high-pressure slurry and the flushing of the magnetic medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of a high-pressure high-gradient magnetic separator of the present invention;

[0032] Figure 2 It is a schematic diagram of the high-pressure sorting chamber.

[0033] In the figure: 1. high-pressure sorting chamber; 2. discharge pipe; 3. ore, water and air feeding device; 4. frame; 5. yoke; 6. excitation coil; 7. magnetic medium; 8. fourth valve; 9. feed pipe; 10. first valve; 11. outer cylinder; 12. inner cylinder; 13. inner cylinder bracket; 14. outer cylinder bracket; 15. end cover; 16. locking bolt; 17. locking nut; 18. return pipe; 19. second valve; 20. flushing pipe; 21. third valve; 22. four-way joint; 23. three-way joint; 24. fifth valve. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in conjunction with the accompanying drawings. The following is a preferred embodiment of the present invention, which is intended to provide a basic understanding of the present invention, but is not intended to confirm the key or decisive elements of the present invention or to limit the scope of protection.

[0035] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0036] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0037] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0038] It should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Please refer to Figure 1An embodiment of the present invention provides a high-pressure high-gradient magnetic separator, including a mine water and air supply device 3, a frame 4, a magnetic yoke 5, an exciting coil 6, a high-pressure separation cavity 1, a magnetic medium 7 and a discharging device.

[0040] The magnetic yoke 5 has a circular inner cavity, and the exciting coil 6 is embedded in the inner wall of the inner cavity of the magnetic yoke 5. The magnetic yoke 5 is mainly used to be fixed to the exciting coil 6, so that the magnetic field generated by the exciting coil 6 is distributed inside the magnetic yoke 5, reducing the loss of magnetic field energy; and can also make the magnetic field generated by the exciting coil 6 more uniformly distributed.

[0041] The yoke 5 can generally be set in a ring or disc shape. For example, the yoke 5 in this embodiment is set in a ring shape, and a cylindrical inner cavity is formed inside. The yoke 5 is fixed on the frame 4, and an annular mounting groove is provided on the inner wall of the yoke 5, so that the excitation coil 6 can be completely embedded in the inner wall of the yoke 5.

[0042] The high-pressure sorting chamber 1 is arranged in the inner cavity, and the high-pressure sorting chamber 1 mainly includes an outer cylinder 11 and an inner cylinder 12. The inner cylinder 12 and the outer cylinder 11 are generally made of iron materials. The outer cylinder 11 is fixedly arranged in the inner cavity, and the inner cylinder 12 can be slidably embedded in the outer cylinder 11. Here, the upper end of the outer cylinder 11 is provided with an outer cylinder support 14 with a radially extending edge, and the middle outer wall of the inner cylinder 12 is provided with a radially extending inner cylinder support 13. The inner diameter of the outer cylinder 11 is approximately the same as the outer diameter of the inner cylinder 12, so that the inner cylinder 12 can be inserted into the outer cylinder 11 and slide along the outer cylinder 11, and the inner cylinder support 13 can be supported on the outer cylinder support 14 to ensure that the inner cylinder 12 is in a stable state. Preferably, the inner cylinder support 13 and the outer cylinder support 14 are both set as annular plates, which can be stably overlapped and supported.

[0043] An openable end cap 15 is provided at the upper end of the inner cylinder 12. The end cap 15 closes the upper end of the inner cylinder 12 during magnetic separation, and opens the upper end of the inner cylinder 12 when the inner cylinder 12 needs to be cleaned or repaired. It is understandable that the end cap 15 can be set in various forms, as long as it meets the requirements of opening or closing the upper end of the inner cylinder 12. A sealing ring can also be provided between the end cap 15 and the upper end of the inner cylinder 12 to enhance the sealing effect.

[0044] like Figure 2As shown, the end cover 15 in this embodiment is a quick-opening flange, and a flange mounting seat is provided at the upper end of the inner cylinder 12. The quick-opening flange is rotatably connected to the flange mounting seat, and a plurality of rotatable locking bolts 16 are provided on the flange mounting seat, and one end of the locking bolt 16 is rotatably connected to the flange mounting seat, so that it can rotate freely around a horizontal axis. The edge of the quick-opening flange is provided with a plurality of fixing grooves, and the fixing grooves are U-shaped grooves. The fixing grooves correspond to the locking bolts 16 one by one. Each of the locking bolts 16 can be rotated upward to be inserted into its corresponding fixing groove and locked by a locking nut 17. When all the locking bolts 16 are locked by the locking nuts 17, all the locking nuts 17 press the quick-opening flange, thereby sealing the upper end of the inner cylinder 12. The locking nuts 17 are generally sleeved on the locking bolts 16. When the nuts are loosened, the locking bolts 16 can rotate freely, thereby releasing and opening the quick-opening flange.

[0045] The lower end of the inner cylinder 12 is closed and provided with a discharge port. The magnetic medium 7 is arranged in the inner cylinder 12, and the magnetic medium 7 can be selected from steel wool, steel mesh or composite medium mesh. Generally, the magnetic medium 7 is arranged in the middle of the inner cylinder 12, and the magnetic medium 7 is arranged horizontally, and the edge is detachably connected to the inner wall of the inner cylinder 12.

[0046] The ore-feeding, water-feeding and air-feeding device 3 is connected to the end cover 15 through a pipeline to communicate with the inner cylinder 12. The ore-feeding, water-feeding and air-feeding device is used to first input liquid with gas dissolved inside into the inner cylinder 12, and then input the ore pulp to be magnetically separated into the inner cylinder 12, so that the van der Waals repulsion of the gas inside the liquid weakens the adsorption effect between the magnetic particle matter and the non-magnetic particle matter in the ore pulp, so that the magnetic particle matter is adsorbed and separated by the magnetic medium 7.

[0047] The ore-feeding, water-feeding and air-feeding device 3 can be flexibly set according to the actual application needs, and only needs to meet the requirements of outputting gas of a predetermined pressure, a predetermined volume of liquid and slurry to be magnetically separated. The liquid can be water. The ore-feeding, water-feeding and air-feeding device 3 generally includes a feed pipe 9 and a pressurizing device, wherein the feed pipe 9 is connected to the end cover 15, and the pressurizing device is connected to the feed pipe 9, so as to input pressurized gas into the inner cylinder 12 through the feed pipe 9. The pressurizing device can be a reactor, a booster pump or a high-pressure gas cylinder, etc., which can pressurize the air to a predetermined pressure and then input it into the feed pipe 9, and then into the inner cylinder 12. At the same time, the feed pipe 9 can also be connected to liquid and slurry conveying equipment, and a predetermined volume of liquid and a predetermined flow of slurry are respectively input into the feed pipe 9. In order to control the gas, liquid or slurry input into the feed pipe 9, a first valve 10 is provided on the feed pipe 9.

[0048] like Figure 2As shown, in some other embodiments, the feed pipe 9 is provided with a four-way joint 22, and the four-way joint 22 is also connected to the return pipe 18 and the flushing pipe 20, the return pipe 18 is connected to the lower end of the inner cylinder 12, and the return pipe 18 is provided with a second valve 19 at one end close to the four-way joint 22, and the flushing pipe 20 is provided with a third valve 21. The return pipe 18 can transport the slurry after magnetic separation in the inner cylinder 12 back to the inner cylinder 12 for circulating magnetic separation. The flushing pipe 20 is used to input high-pressure cleaning water, high-pressure cleaning liquid or high-pressure gas into the inner cylinder 12 to flush the inner cylinder 12.

[0049] In some other embodiments, the discharge device includes a discharge pipe 2, the discharge pipe 2 is connected to the discharge port, a fourth valve 8 and a three-way joint 23 are provided on the discharge pipe 2, the three-way joint is connected to the return pipe 18, and a fifth valve 24 is provided at one end of the return pipe 18 close to the three-way joint 23. The fifth valve 24 prevents the discharge pipe 2 from entering the return pipe 18 after the ore pulp after magnetic separation is discharged.

[0050] It should be noted that, in this embodiment, the inner cylinder 12 is in a high-pressure environment when working, so the first valve 10, the second valve 19, the third valve 21, the fourth valve 8 and the fifth valve 24 are all high-pressure valves.

[0051] In addition, an embodiment of the present invention also provides a magnetic separation method of the above-mentioned high pressure high gradient magnetic separator for purifying clay minerals:

[0052] S1. Close the discharge port, and use the ore-feeding, water-feeding and air-feeding device 3 to feed the inner cylinder 12 with a high-pressure gas-liquid miscible liquid of a predetermined pressure, wherein the high-pressure gas-liquid miscible liquid contains a gas that is insoluble in the ore slurry, so that the inner cylinder 12 is filled with the high-pressure gas-liquid miscible liquid.

[0053] As in this embodiment, the fourth valve 8 is closed to seal the lower end of the inner cylinder 12; at the same time, the end cap 15 at the upper end of the inner cylinder 12 is closed. A high-pressure gas-liquid miscible liquid is input into the inner cylinder 12 through the ore supply, water supply and gas supply device 3. The high-pressure gas-liquid miscible liquid is a liquid containing high-pressure gas. The liquid can be water or other liquids used to carry the particulate matter to be magnetically separated, and the gas can be CO2 or other gases that can be dissolved in liquid under high pressure conditions.

[0054] S2, starting the excitation coil 6 to make the background magnetic induction intensity in the magnetic yoke 5 reach a predetermined magnetic induction intensity.

[0055] The excitation coil 6 is turned on to make the excitation current of the excitation coil 6 reach the required background magnetic induction intensity in the magnetic yoke 5, and the required background magnetic induction intensity is 0.5-5.0 T. Under the action of strong magnetic force, the inner cylinder support 13 and the outer cylinder support 14 overlap and are stably fixed.

[0056] S3, open the discharge port, that is, open the fourth valve 8, open the discharge pipe 2, and input the high-pressure gas-liquid-solid miscible ore slurry to be magnetically separated into the inner cylinder 12 through the ore feeding, water feeding and air feeding device 3. A composite force field of high pressure field containing gas van der Waals repulsion, liquid flow force field and high gradient magnetic field coupling is formed in the inner cylinder 12, wherein the composite force field containing gas van der Waals repulsion can reduce the adsorption of magnetic particle matter and non-magnetic particle matter, so that the magnetic particle matter is adsorbed and separated by the magnetic medium 7.

[0057] It should be noted that the concentration and pressure of the high-pressure gas-liquid-solid solution slurry to be magnetically separated are generally adjusted in advance so that the pressure of the high-pressure gas-liquid-solid solution slurry formed after the slurry to be magnetically separated is input into the inner cylinder 12 is maintained within a predetermined pressure range. As in the present embodiment, the material particle size range of the slurry to be magnetically separated input into the inner cylinder 12 is 0 to 0.074 mm, the slurry concentration is 1 to 50 wt%, the slurry temperature is 0 to 80 ° C, and the slurry pressure is 0.8 to 20 MPa. The pressure of the high-pressure gas-liquid-solid solution slurry formed after the slurry to be magnetically separated is input into the inner cylinder 12 is 0.8 to 20 MPa.

[0058] After the magnetic particles in the ore pulp are adsorbed and separated by the magnetic medium 7, the non-magnetic particles in the ore pulp flow through the magnetic medium 7 and flow out from the discharge pipe 2 at the lower end of the inner cylinder 12. If the ore pulp flowing out at this time meets the magnetic separation requirements, the fourth valve 8 is opened to discharge the ore pulp directly from the discharge pipe 2; if the ore pulp flowing out at this time does not meet the magnetic separation requirements, the fourth valve 8 is opened, the second valve 19 and the fifth valve 24 are opened, and the ore pulp is transported back to the inner cylinder through the reflux pipe 18 for further circulation magnetic separation, until the circulation magnetic separation meets the magnetic separation requirements and the ore pulp is discharged. Finally, after the ore pulp is discharged, the excitation coil 6 is closed, so that the magnetic particles adsorbed by the magnetic medium 7 flow out from the discharge pipe 2 to form a magnetic product.

[0059] After the magnetic separation is completed, high-pressure cleaning water, cleaning liquid or gas can be introduced into the inner cylinder 12 through the flushing pipe 20 to flush the magnetic medium 7 in the inner cylinder 12 in preparation for the next magnetic separation. After multiple magnetic separations, when the magnetic medium 7 is blocked, the end cover 15 of the inner cylinder 12 can be opened, and the magnetic medium 7 can be taken out for comprehensive cleaning.

[0060] A high-pressure and high-gradient magnetic separator of the present invention forms a composite force field containing the van der Waals repulsive force of high-pressure gas inside the inner cylinder 12, which can greatly reduce the agglomeration and entrainment of fine-grained magnetic particles and non-magnetic particles near the magnetic medium, and enhance the capture ability of the magnetic medium 7 for magnetic substances, thereby improving the purity and recovery rate of the magnetic product.

[0061] In this article, the directional words such as front, back, top, and bottom involved are defined by the positions of the parts in the drawings and the positions of the parts relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different ways of use and placement, and the use of the directional words should not limit the scope of protection claimed in this application.

[0062] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure high-gradient magnetic separator, characterized in that: It includes a high-pressure separation chamber, an ore-feeding, water-feeding and air-feeding device, a frame, a magnetic yoke, an exciting coil, a magnetic medium and a discharging device; A magnetic yoke, which is mounted on the frame and has an annular inner cavity; An exciting coil embedded in the inner wall of the inner cavity of the magnetic yoke; A high-pressure separation chamber, comprising an outer cylinder and an inner cylinder, wherein the outer cylinder is fixedly arranged in the inner chamber, the inner cylinder is slidably embedded in the outer cylinder, an openable end cover is arranged at the upper end of the inner cylinder, the lower end of the inner cylinder is closed and provided with a discharge port, and the magnetic medium is arranged in the inner cylinder; A ore-feeding, water-feeding and air-feeding device, which is connected to the end cover through a pipeline to communicate with the inner cylinder, and is used to input liquid containing high-pressure gas and ore pulp to be magnetically separated containing high-pressure gas into the inner cylinder to convert the liquid-solid ore pulp into a high-pressure gas-liquid-solid miscible ore pulp; The inner cylinder of the high-pressure separation chamber is a pressure vessel, which can perform magnetic separation under high-pressure conditions after being magnetized, and utilizes the van der Waals repulsion of the gas inside the slurry to weaken the adsorption between the magnetic particles and the non-magnetic particles in the slurry, so that the magnetic particles are adsorbed and separated by the magnetic medium under the condition of dispersion and homogenization; The discharging device is connected to the lower end of the inner cylinder.

2. A high pressure high gradient magnetic separator as claimed in claim 1, characterized in that: The ore-feeding, water-feeding and gas-feeding device comprises a feed pipe and a pressurizing device, wherein the feed pipe is connected to the end cover, and the pressurizing device is connected to the feed pipe so as to input pressurized gas into the inner cylinder through the feed pipe.

3. A high pressure high gradient magnetic separator as claimed in claim 2, characterized in that: The pressurizing equipment is a reaction kettle, a booster pump or a high-pressure gas cylinder.

4. A high pressure high gradient magnetic separator as claimed in claim 2, characterized in that: The feed pipe is provided with a first valve.

5. A high pressure high gradient magnetic separator as claimed in claim 4, characterized in that: The feed pipe is provided with a four-way joint, which is also connected to a reflux pipe and a flushing pipe. The reflux pipe is connected to the lower end of the inner cylinder. A second valve is provided at one end of the reflux pipe close to the four-way joint, and a third valve is provided on the flushing pipe.

6. A high pressure high gradient magnetic separator as claimed in claim 5, characterized in that: The discharging device comprises a discharging pipe, the discharging pipe is connected to the discharging port, a fourth valve and a three-way joint are arranged on the discharging pipe, the three-way joint is connected to the reflux pipe, and a fifth valve is arranged at one end of the reflux pipe close to the three-way joint.

7. A high pressure high gradient magnetic separator as claimed in claim 1, characterized in that: The end cover is a quick-opening flange, and a flange mounting seat is provided at the upper end of the inner cylinder. The quick-opening flange is rotatably connected to the flange mounting seat, and a plurality of rotatable locking bolts are provided on the flange mounting seat. A plurality of fixing grooves are provided on the edge of the quick-opening flange, and each of the locking bolts can be rotated upward to be inserted into a fixing groove and locked by a locking nut.

8. A magnetic separation method using a high pressure high gradient magnetic separator according to any one of claims 1 to 7: S1, closing the discharge port, inputting a high-pressure gas-liquid miscible liquid of a predetermined pressure into the inner cylinder through an ore-feeding, water-feeding, and air-feeding device and related pipelines, wherein the high-pressure gas-liquid miscible liquid contains gas soluble in the ore slurry, so that the inner cylinder is filled with the high-pressure gas-liquid miscible liquid; S2, starting the excitation coil to make the background magnetic induction intensity in the magnetic yoke reach a predetermined magnetic induction intensity; S3, opening the discharge port, inputting the high-pressure gas-liquid-solid miscible ore slurry to be magnetically separated into the inner cylinder through the ore feeding, water feeding and air feeding device, and performing magnetic separation in the inner cylinder under the conditions of a composite force field coupled with a high pressure field containing a gas van der Waals repulsive force, a liquid flow field and a high gradient magnetic field, wherein the composite force field containing a gas van der Waals repulsive force can reduce the adsorption of magnetic particle matter and non-magnetic particle matter, so that the magnetic particle matter is adsorbed and separated by the magnetic medium; S4. After the slurry stops flowing out of the high-pressure separation cavity outlet, the outlet is closed to complete a single magnetic separation; or the slurry output from the outlet is repeatedly input into the inner cylinder for cyclic magnetic separation until the required number of magnetic separations is reached.

9. A magnetic separation method of a high pressure high gradient magnetic separator as claimed in claim 8, characterized in that: The maximum pressure that the ore-feeding, water-feeding and air-feeding devices and related pipelines in step S1 can withstand is 0.8-20 MPa, and the maximum pressure that the inner cylinder can withstand is 0.8-20 MPa.

10. A magnetic separation method of a high pressure high gradient magnetic separator as claimed in claim 8, characterized in that: In the step S3, the material particle size range of the high-pressure gas-liquid-solid miscible slurry to be magnetically separated input into the inner cylinder is 0-0.074 mm, the slurry concentration is 1-50 wt%, the slurry temperature is 0-80° C., and the slurry pressure is 0.8-20 MPa.

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