An experimental device and method for obtaining the magnetic field intensity suitable for magnetic separation

Abstract

The present invention relates to a test device for obtaining a magnetic separation applicable magnetic field intensity, which includes a conveying pipe that gradually extends obliquely to the right from top to bottom. The upper end of the conveying pipe is a feeding port, and the lower end is a discharging port. The test device further includes a feeding device for feeding materials into the feeding port and a material receiving device arranged at the position of the discharging port. The test device also includes a magnet support arranged on the lower side of the conveying pipe. An adjustable-height magnet crossbeam arranged side by side on the lower side of the conveying pipe is provided on the magnet support. A left magnet and a right magnet with adjustable spacing and opposite magnetic poles are arranged on the magnet crossbeam. The conveying pipe has a magnetic separation section corresponding to the left magnet and the right magnet. The present invention provides a test device for obtaining a magnetic separation applicable magnetic field intensity and a test method using the test device.

Description

Technical Field

[0001] The present invention relates to the technical field of pulp magnetic separation, and particularly relates to a test device and a test method for obtaining the applicable magnetic field intensity for magnetic separation. Background Art

[0002] A magnetic separator is a common impurity removal device for metal impurities in pulp. Its basic working principle is to magnetize the medium box through a magnetic field. When the pulp flows through the medium box, the medium box sucks out the metal impurities in the pulp by magnetic force.

[0003] Conventional methods for separating medium-magnetic and weakly magnetic minerals at home and abroad mainly rely on magnetic separation. Medium-magnetic and weakly magnetic minerals exist either in the form of monomer dissociation or in the form of intergrowths, or in a mixed form of monomer dissociation and intergrowths. Usually, they exist in a mixed form of monomer dissociation and intergrowths. Due to different mineral types and different contents of intergrowths in the minerals, the applicable separation magnetic field intensities for medium-magnetic and weakly magnetic minerals vary greatly.

[0004] In actual scientific research, in order to verify the suitability of the magnetic field intensity through experiments with actual minerals, a large number of experimental studies are often required using magnetic separators with different field intensities. If the field intensities are different, nearly 10 magnetic separators are needed, and there are also many conditional experiments for each one. This results in a large number of devices being required for the experiment, as well as a large amount of pulp and a large amount of manpower being needed to obtain the final result. This brings inconvenience to scientific research experiments and requires a large investment. Therefore, in actual scientific research, a simple device and method for quickly testing the applicable magnetic field intensity for medium-magnetic and weakly magnetic minerals are needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a test device for obtaining the applicable magnetic field intensity for magnetic separation; the purpose of the present invention is also to provide a test method using this test device.

[0006] To solve the above technical problems, the technical solution of a test device for obtaining the applicable magnetic field intensity for magnetic separation in the present invention is as follows:

[0007] A test device for obtaining the applicable magnetic field intensity for magnetic separation includes a conveying pipe that gradually extends obliquely to the right from top to bottom. The upper end of the conveying pipe is the feed inlet, and the lower end is the discharge outlet. The test device also includes a feeding device for feeding materials into the feed inlet and a receiving device arranged at the position of the discharge outlet. The test device also includes a magnet support arranged on the lower side of the conveying pipe. An adjustable-height magnet crossbeam arranged side by side on the lower side of the conveying pipe is provided on the magnet support. A left magnet and a right magnet with adjustable spacing and opposite magnetic poles are arranged on the magnet crossbeam. The conveying pipe has a magnetic separation section corresponding to the left magnet and the right magnet.

[0008] Furthermore, the magnet bracket includes a left support rod and a right support rod, and the upper ends of the left support rod and the right support rod are provided with vertical guide grooves extending in the up and down directions. The two end guides of the magnet beam are assembled in the corresponding vertical guide grooves, and the magnet beam and the corresponding support rod are fixed by a first bolt.

[0009] Furthermore, a beam guide hole extending along the length direction of the magnet beam is provided on the magnet beam, and a second bolt connected to the corresponding magnet is passed through the beam guide hole.

[0010] Furthermore, the material receiving device includes a material receiving plate with a rotating axis extending in the up-and-down direction and a material receiving driving mechanism for driving the material receiving plate to rotate in a step-by-step manner. At least two groups of material receiving mechanisms are arranged in circumferential sequence on the material receiving plate, and each group of material receiving mechanisms includes a material receiving barrel and a magnetic material receiving barrel arranged at intervals along the circumferential direction.

[0011] Furthermore, the feeding device includes a feeding tray with a rotating axis extending in the up-and-down direction and a feeding drive mechanism that drives the feeding tray to rotate step by step. At least two groups of feeding mechanisms are arranged in circumferential sequence on the feeding tray, and each group of feeding mechanisms includes a material feeding cylinder and a water feeding cylinder that are fixedly arranged at intervals along the circumferential direction.

[0012] Furthermore, each group of material receiving mechanisms also includes a material receiving lever fixed to the lower end of the corresponding material receiving barrel and the magnetic material receiving barrel, the bottom of the material receiving lever is hingedly connected to the material receiving tray, and a lever spring is arranged between the two ends of the material receiving lever and the material receiving tray.

[0013] Furthermore, a hinged structure with an axis extending in the left and right directions is provided at the bottom of the magnet bracket, and a bracket reset spring for maintaining the magnet bracket in an upright posture is provided on the front and rear sides of the magnet bracket. The test device also includes a transmission plate coaxially connected to the receiving disc, and fan-shaped transmission gears are arranged at intervals along the circumference of the transmission plate. The number of fan-shaped transmission gears is the same as the number of magnetic material receiving barrels. The test device also includes a working gear for meshing transmission with the fan-shaped transmission gear, and a rope winding wheel is coaxially connected to the working gear, and a bracket pull rope for applying a forward force to the magnet bracket is wound on the rope winding wheel. When the material receiving barrel corresponds to the position of the discharge port, the working gear corresponds to the gap between the two adjacent fan-shaped transmission gears. When the receiving disc rotates with the magnetic material receiving barrel to correspond to the position of the discharge port, the corresponding fan-shaped transmission gear meshes with the working gear, and the magnet bracket is pulled down by the bracket pull rope.

[0014] Furthermore, in the first step and the fourth step, the magnetic field strength of the magnetic selection section can be different by replacing the left magnet and the right magnet with different magnetic properties.

[0015] The technical scheme of the test method in the present invention is as follows:

[0016] The test method includes the following steps. In the first step, adjust the distance between the left and right magnets and / or the height of the magnet crossbeam so that the left magnet and the right magnet generate a first magnetic field with a certain magnetic field intensity at the magnetic separation section. In the second step, the feeding device feeds a certain amount of pulp into the feeding port. The pulp relies on its own gravity and is collected by the receiving device through the discharging port. The metal impurities in the pulp are adsorbed on the inner wall of the magnetic separation section. In the third step, eliminate the influence of the first magnetic field on the magnetic separation section. The feeding device feeds a certain amount of water into the inlet. The water flushes the metal impurities on the inner wall of the magnetic separation section to the receiving device for collection. In the fourth step, adjust the distance between the left and right magnets and / or the height of the magnet crossbeam so that the left magnet and the right magnet generate a second magnetic field with a certain magnetic field intensity at the magnetic separation section. The intensity of the second magnetic field is different from that of the first magnetic field. Repeat the second step and the third step to find the corresponding magnet distance and magnet height with more adsorbed metal impurities. In the fifth step, under the conditions of the magnet distance and magnet height corresponding to the fourth step, sequentially replace the left magnet and the right magnet with gradually increasing or decreasing magnetism, and repeat the second step and the third step.

[0017] The beneficial effects of the present invention are as follows. In the present invention, the material enters the conveying pipe through the feeding port and is then discharged through the discharging port and collected by the receiving device. When the material passes through the magnetic separation section, the metal substances in the material are adsorbed on the inner wall of the magnetic separation section of the conveying pipe. For different magnet distances and magnet heights, the quantity of adsorbed metal substances is different. By adjusting the distance between the left magnet and the right magnet and the distance between the magnet crossbeam and the conveying pipe, the optimal magnet distance and magnet height can be obtained. Description of the Drawings

[0018] By reading the following detailed description with reference to the drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, where:

[0019] Figure 1 is a schematic structural diagram of an embodiment of a test device for obtaining a magnetic separation applicable magnetic field intensity in the present invention;

[0020] Figure 2 is Figure 1 a schematic structural diagram of the feeding device in;

[0021] Figure 3 is Figure 2 a top view of;

[0022] Figure 4 is Figure 1 a schematic structural diagram of the receiving device in;

[0023] Figure 5 is Figure 4Top view;

[0024] Figure 6 is Figure 1 Schematic diagram of the cooperation between the magnet support and the magnet cross beam in

[0025] Figure 7 is Figure 1 Schematic diagram of the cooperation between the drive disk, the working gear and the support cable in

[0026] Explanation of reference numerals: 1, feeding device; 2, feed inlet; 3, conveying pipe; 4, magnetic separation section; 5, discharge outlet; 6, material receiving device; 7, right leg of the conveying pipe; 8, right magnet; 9, magnet cross beam; 10, left magnet; 11, magnet support; 12, left leg of the conveying pipe; 13, feeding tray; 14, material feeding cylinder; 15, water feeding cylinder; 16, material receiving cylinder; 17, receiving lever; 18, lever spring; 19, drive disk; 20, receiving tray; 21, transmission gear; 22, receiving drive motor; 23, magnetic material receiving cylinder; 24, left support rod; 25, right support rod; 26, first bolt; 27, second bolt; 28, hinge structure; 29, support return spring; 30, vertical guide groove; 31, reversing pulley; 32, support cable; 33, sector transmission gear; 34, working gear; 35, rope winding wheel. Detailed implementation manners

[0027] For the convenience of understanding the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention.

[0029] An embodiment of a test device for obtaining a magnetic field strength suitable for magnetic separation in the present invention is as Figures 1 to 7 shown: It includes a conveying pipe 3 that gradually extends obliquely to the right from top to bottom. The upper end of the conveying pipe 3 is a feed inlet 2, and the lower end is a discharge outlet 5. The left end of the conveying pipe 3 is fixed on the left leg 12 of the conveying pipe, and the right end of the conveying pipe 3 is fixed on the right leg 7 of the conveying pipe.

[0030] The test device further includes a feeding device 1 for feeding materials into the feeding port and a material receiving device 6 arranged at the position of the discharging port. The test device further includes a magnet support 11 arranged under the conveying pipe. An adjustable-height magnet cross beam 9 arranged side by side under the conveying pipe is arranged on the magnet support 11. A left magnet 10 and a right magnet 8 with opposite magnetic poles and adjustable spacing are arranged on the magnet cross beam 9. In this embodiment, the left magnet, the right magnet and the magnet cross beam 9 are detachably connected. The test device in this embodiment includes multiple groups of left magnets and right magnets with different magnetic field intensities. During use, a corresponding group of left magnet and right magnet can be fixed on the magnet cross beam according to needs.

[0031] The left magnet and the right magnet are the same in size, shape and field strength. The upper end surfaces of the left magnet and the right magnet are on the same plane. For the adjacent ends of the left magnet and the right magnet, one is an N pole and the other is an S pole.

[0032] The conveying pipe has a magnetic separation section 4 corresponding to the left magnet and the right magnet. The magnetic separation section 4 is located in the magnetic field generated by the left magnet and the right magnet. In this embodiment, both the left magnet and the right magnet are permanent magnets, and the upper end surfaces of the left magnet and the right magnet are flat surfaces. In other embodiments of the present invention, the upper end surfaces of the left magnet and the right magnet can also be cylindrical surfaces, tower-shaped surfaces, hyperbolic cross-section tooth-shaped surfaces, etc.

[0033] The magnet support includes a left support rod 24 and a right support rod 25. Vertical guide grooves 30 extending in the up and down direction are arranged at the upper ends of the left support rod 24 and the right support rod 25. The two ends of the magnet cross beam are assembled in the corresponding vertical guide grooves in the up and down direction and fixed to the corresponding support rods by first bolts 26. That is to say, when the first bolts are loosened, the two ends of the magnet cross beam can move up and down for adjustment, and when the first bolts are tightened, the position of the magnet cross beam can be fixed.

[0034] A cross beam guide hole extending in the length direction of the magnet cross beam is arranged on the magnet cross beam. A second bolt 27 connected to the corresponding magnet is inserted through the cross beam guide hole. By loosening the second bolt 27, the relative positions of the left magnet and the right magnet can be adjusted, and by tightening the second bolt, the positions of the left magnet and the right magnet can be fixed.

[0035] The feeding device includes a feeding tray 13 whose rotation axis extends in the up-down direction and a feeding drive mechanism that drives the feeding tray to rotate step by step. The feeding drive mechanism includes a feeding drive motor, which is a servo motor. The feeding drive motor is connected to the feeding tray in a transmission manner. Three groups of feeding mechanisms are arranged in sequence along the circumferential direction on the feeding tray. Each group of feeding mechanisms includes a material feeding cylinder 14 and a water feeding cylinder 15 that are fixedly arranged at intervals along the circumferential direction. The bottom of the material feeding cylinder 14 and the water feeding cylinder 15 is provided with a discharge port 5, and a discharge door is provided at the discharge port. When in use, each material feeding cylinder is filled with materials of the same mass, and each water feeding cylinder is filled with water of the same weight.

[0036] The material receiving device includes a material receiving tray 20 whose rotating axis extends in the up-down direction and a material receiving driving mechanism for driving the material receiving tray to rotate step by step. The material receiving driving mechanism includes a material receiving driving motor, which is a servo motor. A transmission gear is fixed coaxially on the material receiving tray. A motor shaft gear engaged with the transmission gear is fixed on the motor shaft of the material receiving driving motor. Three groups of material receiving mechanisms are sequentially arranged along the circumferential direction on the material receiving tray, and each group of material receiving mechanisms includes a material receiving barrel 16 and a magnetic material receiving barrel 23 arranged at intervals along the circumferential direction.

[0037] Each group of receiving mechanism also includes a receiving lever 17 fixed to the lower end of the corresponding material receiving barrel and the magnetic receiving barrel. The bottom of the receiving lever 17 is hingedly connected to the receiving tray 20, and a lever spring 18 is arranged between the two ends of the receiving lever and the receiving tray. When in use, the weight of the material receiving barrel 16 and the magnetic receiving barrel 23 is different, which causes the lever to tilt. If the magnetic field has a good adsorption of metal impurities, the weight of the impurities subsequently flushed into the magnetic receiving barrel will be large, while the weight of the material receiving barrel will be lighter. According to the different inclination angles of each group of receiving levers, it can be intuitively seen which test has a better adsorption of metal impurities.

[0038] The bottom of the magnet bracket is provided with a hinge structure 28 with an axis extending in the left-right direction, that is to say, the bottom of the left support rod and the right support rod are provided with a hinge structure 28 with an axis extending in the left-right direction, the left support rod and the right support rod can be flipped forward, and the front and rear sides of the left support rod and the front and rear sides of the right support rod are provided with bracket reset springs 29 for maintaining the upright posture of the magnet bracket. The bracket reset spring is a tension spring. In the absence of external force, the magnet bracket, i.e. the left support rod and the right support rod, are pulled to a vertical usage posture through the bracket reset springs 29 on the front and rear sides.

[0039] The test device further includes a driving disk 19 that is coaxially and drivingly connected to the material receiving tray. Sector driving gears 33 are circumferentially and spacedly arranged on the driving disk 19. The number of sector driving gears is the same as the number of magnetic material receiving cylinders. Therefore, in this embodiment, the number of sector driving gears is three. The test device further includes a working gear 34 that engages and drives with the sector driving gears. A rope winding wheel 35 is coaxially and drivingly connected to the working gear 34. A bracket pulling rope 32 for applying a forward force to the magnet bracket is wound around the rope winding wheel 35. Item 31 in the figure represents a reversing pulley for the bracket pulling rope to pass through for reversing.

[0040] When the material receiving cylinder corresponds to the position of the discharge port, the gap between the working gear and two adjacent sector driving gears corresponds. When the receiving tray drives the magnetic material receiving cylinder to rotate to the position corresponding to the discharge port, the corresponding sector driving gear engages with the working gear, and the magnet bracket is pulled down through the bracket pulling rope.

[0041] The usage method of this test device is as follows: Prepare permanent magnet groups with multiple magnetic field intensities. For example, in this embodiment, prepare permanent magnet groups with magnetic field intensities of 1500 Oe, 2000 Oe, 2500 Oe, 3000 Oe, 3500 Oe, 4000 Oe, 4500 Oe, 5000 Oe, 5500 Oe, and 6000 Oe respectively.

[0042] Taking graphite vanadium ore as an example, graphite vanadium ore contains pyrrhotite, i.e., metal impurities, and it is required to quickly test the magnetic field intensity suitable for separating this pyrrhotite through experiments.

[0043] According to the characteristics that pyrrhotite generally has strong magnetism or medium magnetism,

[0044] First, install the left magnet and the right magnet of the permanent magnet group with a magnetic field intensity of 2000 Oe on the magnet crossbeam. Adjust the height of the magnet crossbeam. The purpose of adjusting the height of the magnet crossbeam is to adjust the distance b between the left magnet and the right magnet from the magnetic separation section, and adjust the distance a between the left magnet and the right magnet. Among the three feeding mechanisms of the feeding device, the same mass of pulp is contained in each material feeding cylinder, and the same weight of water is contained in each water feeding cylinder.

[0045] The feeding tray rotates one of the material feeding cylinders to the position of the feed port of the conveying pipe, and the receiving tray rotates one of the material receiving cylinders to the position of the discharge port of the conveying pipe. At this time, the gap between the working gear and two adjacent sector driving gears corresponds. That is to say, there is no transmission between the working gear and the driving disk. Under the action of the bracket reset spring, the magnet bracket maintains a vertical posture.

[0046] The material feeding barrel feeds slurry into the feeding port. The slurry flows along the conveying pipe to the discharging port by its own gravity, and then flows into the material receiving barrel. The metal impurities in the slurry are adsorbed on the inner wall of the magnetic separation section. Then the feeding plate rotates clockwise to rotate the water feeding barrel adjacent to the material feeding barrel to the feeding port position, and the receiving plate rotates counterclockwise to rotate the magnetic receiving barrel adjacent to the material receiving barrel to the discharging port position. During the rotation of the receiving plate, the fan-shaped transmission gear meshes with the working gear, and the working gear rotates with the rope wheel. One end of the bracket pull rope is wound around the rope winding wheel, and the other end of the bracket pull rope applies a forward force to the magnet bracket to pull down the magnet bracket. Pulling down the magnet bracket has two functions. One is to make the magnetic separation section separate from the magnetic fields of the left and right magnets, so as to facilitate the washing of metal impurities in the magnetic separation section. The other is that after the magnet bracket is pulled down, the height of the magnet beam is lowered, so the position of the magnet beam and the relative distance between the left and right magnets can be easily adjusted, and the a value and b value can be adjusted.

[0047] The water feeding barrel feeds water into the conveying pipe, and the water washes the metal impurities on the inner wall of the magnetic selection section into the magnetic material receiving barrel. Then the feeding disc continues to rotate clockwise to rotate the next material feeding barrel to the feed port position, and the receiving disc continues to rotate counterclockwise to rotate the next material receiving barrel to the discharge port position. During the rotation of the receiving disc, the working gear corresponds to the gap between the two adjacent fan-shaped transmission gears again. At this time, the working gear and the transmission disc no longer transmit. Under the action of the bracket reset spring, the magnet bracket resumes the inverted vertical posture, and the magnetic selection section is again located in the magnetic field of the left magnet and the right magnet for the next test.

[0048] In three experiments, when the a parameter was 1cm, 2cm, and 3cm, the b parameter was 0.5cm, 1.0cm, and 1.5cm. Through three experiments, it can be analyzed that at 2000Oe, the appropriate a parameter is 2cm and the appropriate b parameter is 1cm. However, even under the appropriate parameters, non-magnetic materials still contain pyrrhotite, which shows that the field strength is too small and a larger field strength experiment should be conducted. Therefore, under the condition of fixing the a and b parameters at 2cm and 1cm respectively, subsequent experiments with field strengths of 2500Oe and 3000Oe were conducted, and a set of experimental results were obtained. The comparison of the three sets of results is shown in Table 1.

[0049] Table 1 Experimental results of quickly determining the suitable magnetic field for pyrrhotite separation

[0050]

[0051]

[0052] By comparing the results, when the magnetic field strength is 2500 Oe, the recovery rate of magnetic substances is close to saturation, exceeding 94%, and the grade is good; further increasing the magnetic field strength results in only a small increase in the recovery rate of magnetic substances, but a significant decrease in the S grade of magnetic substances. Therefore, the appropriate magnetic field is determined to be 2500 Oe.

[0053] Taking the recycling of magnetic seeds in sludge generated from sewage treatment as an example, it is necessary to quickly determine the appropriate magnetic field strength for magnetic seed recovery.

[0054] According to the characteristics that magnetic seeds used for solid content in sewage and wastewater treatment generally have strong or medium magnetism, a permanent magnet with a magnetic field strength of 1500 Oe in the first group was initially selected for experiments, and conditional experiments were carried out with a parameters of 1 cm, 1.5 cm, and 2.5 cm and b parameters of 0.6 cm, 1.2 cm, and 1.6 cm respectively. Through the analysis of the experimental results, it was obtained that at 2000 Oe, the appropriate a parameter is 1.5 cm and the appropriate b parameter is 0.6 cm. There are still magnetic seed particles in the non-magnetic substances, and the recovery rate of magnetic seeds in the magnetic substances is relatively low. This indicates that the magnetic field strength is too small, and experiments with a larger magnetic field strength should be carried out. Therefore, under the condition of fixing the a and b parameters at 1.5 cm and 0.6 cm respectively, subsequent experiments with magnetic field strengths of 2000 Oe and 2500 Oe were carried out, and a set of experimental results was obtained. The comparison of the three groups of results is shown in Table 2.

[0055] Table 2 Experimental results for quickly determining the appropriate separation magnetic field for magnetic seed recovery

[0056]

[0057]

[0058] By comparing the results, it can be seen that the recovery rate of magnetic seeds has reached over 98% when the magnetic field strength is 2000 Oe. Further increasing the magnetic field strength results in a slow increase in the recovery rate of magnetic seeds. Therefore, the appropriate magnetic field strength is 2000 Oe.

[0059] An example of the implementation of a test method for obtaining the applicable magnetic field strength for magnetic separation is as follows Figures 1 to 7As shown, the test method includes the following steps. First step: adjust the distance between the left and right magnets and / or the height of the magnet crossbeam so that the left magnet and the right magnet generate a first magnetic field with a certain magnetic field intensity at the magnetic separation section. Second step: the feeding device feeds a certain amount of materials into the feeding port, and the materials are collected by the receiving device through the discharging port relying on their own gravity, and the metal substances in the materials are adsorbed on the inner wall of the magnetic separation section. Third step: eliminate the influence of the first magnetic field on the magnetic separation section, and the feeding device feeds a certain amount of water into the inlet. The water flushes the metal substances on the inner wall of the magnetic separation section to the receiving device for collection. Fourth step: adjust the distance between the left and right magnets and / or the height of the magnet crossbeam so that the left magnet and the right magnet generate a second magnetic field with a certain magnetic field intensity at the magnetic separation section. The intensity of the second magnetic field is different from that of the first magnetic field. Repeat the second step and the third step to find out the corresponding magnet distance and magnet height with more adsorbed metal substances. Fifth step: under the conditions of the magnet distance and magnet height corresponding to the fourth step, sequentially replace the left magnet and the right magnet with gradually increasing or decreasing magnetism, and repeat the second step and the third step. The test device in this embodiment is the same as the test devices in the above-mentioned test device embodiments and will not be elaborated here.

[0060] In the above description of this specification, unless otherwise clearly specified and limited, terms such as "fixed", "installed", "connected" or "coupled" should be understood in a broad sense. For example, for the term "connected", it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the communication inside two components or the interaction relationship between two components. Therefore, unless otherwise clearly limited in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

[0061] According to the above description of this specification, those skilled in the art can also understand the following terms used. For example, terms indicating orientation or position relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise" are based on the orientation or position relationship shown in the drawings of this specification. They are only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or components involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above orientation or position relationship terms cannot be understood or interpreted as a limitation to the solution of the present invention.

[0062] In addition, the terms "first" or "second" and other terms used to refer to numbers or ordinals in this specification are for descriptive purposes only and should not be construed as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise specifically defined.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An experimental device for obtaining the applicable magnetic field intensity for magnetic separation, characterized in that: The invention comprises a conveying pipe which extends gradually from top to bottom and tilts toward the right, the upper end of the conveying pipe is a feed port, and the lower end is a discharge port, the test device also comprises a feeding device for feeding materials into the feed port and a receiving device arranged at the discharge port, the test device also comprises a magnet bracket arranged at the lower side of the conveying pipe, the magnet bracket is provided with a height-adjustable magnet beam arranged in parallel at the lower side of the conveying pipe, the magnet beam is provided with a left magnet and a right magnet with opposite magnetic poles with adjustable spacing, the conveying pipe has a magnetic selection section arranged corresponding to the left magnet and the right magnet, the receiving device comprises a receiving disk with a rotating axis extending in the up-down direction and a receiving drive mechanism for driving the receiving disk to rotate step by step, at least two groups of receiving mechanisms are arranged in circumferential order on the receiving disk, each group of receiving mechanisms comprises a material receiving barrel and a magnetic receiving barrel arranged at intervals along the circumferential direction, and an axial The test device also comprises a hinged structure extending in the left and right directions of the line, and a bracket reset spring for maintaining the upright posture of the magnet bracket is arranged on the front and rear sides of the magnet bracket. The test device also comprises a transmission plate coaxially connected to the receiving disk, and fan-shaped transmission gears are arranged at intervals along the circumference of the transmission plate. The number of fan-shaped transmission gears is the same as the number of magnetic material receiving barrels. The test device also comprises a working gear for meshing transmission with the fan-shaped transmission gear, and a rope winding wheel is coaxially connected to the working gear, and a bracket pull rope for applying a forward force to the magnet bracket is wound on the rope winding wheel. When the material receiving barrel corresponds to the position of the discharge port, the working gear corresponds to the gap between the two adjacent fan-shaped transmission gears. When the receiving disk rotates with the magnetic material receiving barrel to correspond to the position of the discharge port, the corresponding fan-shaped transmission gear meshes with the working gear, and the magnet bracket is pulled down by the bracket pull rope.

2. The experimental device according to claim 1, characterized in that: The magnet bracket includes a left support rod and a right support rod. The upper ends of the left support rod and the right support rod are provided with vertical guide grooves extending in the up and down directions. The two ends of the magnet beam are guided and assembled in the corresponding vertical guide grooves. The magnet beam and the corresponding support rod are fixed by a first bolt.

3. The experimental device according to claim 1, characterized in that: The magnet cross beam is provided with a cross beam guide hole extending along the length direction of the magnet cross beam, and a second bolt connected with the corresponding magnet is passed through the cross beam guide hole.

4. The experimental device according to claim 1, characterized in that: The feeding device includes a feeding tray with a rotating axis extending in the up-down direction and a feeding drive mechanism driving the feeding tray to rotate step by step. At least two groups of feeding mechanisms are arranged in circumferential sequence on the feeding tray, and each group of feeding mechanisms includes a material feeding cylinder and a water feeding cylinder fixedly arranged at intervals along the circumferential direction.

5. The experimental device according to claim 1, characterized in that: Each group of material receiving mechanisms also includes a material receiving lever fixed to the lower end of the corresponding material receiving barrel and the magnetic material receiving barrel, the bottom of the material receiving lever is hingedly connected to the material receiving tray, and a lever spring is arranged between the two ends of the material receiving lever and the material receiving tray.

6. An experimental method using the experimental device according to any one of claims 1 to 5, characterized in that: The test method includes the following steps. First step: adjust the distance between the left and right magnets and / or the height of the magnet crossbeam so that the left magnet and the right magnet generate a first magnetic field with a certain magnetic field intensity at the magnetic separation section. Second step: the feeding device feeds a certain amount of materials into the feeding port, and the materials are collected by the receiving device through the discharging port relying on their own gravity, and the metal substances in the materials are adsorbed on the inner wall of the magnetic separation section. Third step: eliminate the influence of the first magnetic field on the magnetic separation section, and the feeding device feeds a certain amount of water into the inlet, and the water flushes the metal substances on the inner wall of the magnetic separation section to the receiving device for collection. Fourth step: adjust the distance between the left and right magnets and / or the height of the magnet crossbeam so that the left magnet and the right magnet generate a second magnetic field with a certain magnetic field intensity at the magnetic separation section, and the second magnetic field intensity is different from the first magnetic field intensity. Repeat the second step and the third step to find out the corresponding magnet distance and magnet height with more adsorbed metal substances. Fifth step: under the conditions of the magnet distance and magnet height corresponding to the fourth step, sequentially replace the left magnet and the right magnet with gradually increasing or gradually decreasing magnetism, and repeat the second step and the third step.

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