Cascade-coupled demagnetizing shaking table and control method

Abstract

This application relates to a stepped coupling demagnetizing shaker and its control method. The stepped coupling demagnetizing shaker includes: a control terminal, excitation coils, a shaker platform, a magnetic force monitor, and a power unit. The shaker platform has a slurry inlet and a slurry outlet. The magnetic force monitor is located at the slurry outlet. There are two or more excitation coils, which are arranged sequentially along the slurry flow direction on the shaker platform. The shaker platform is tilted and mounted on the power unit. The control terminal is connected to the magnetic force monitor and the excitation coils. The control terminal outputs an excitation current to excite each excitation coil, generating a periodically oscillating and decaying magnetic field, forming a demagnetizing region where the magnetic field strength decreases sequentially along the slurry flow direction. The power unit controls the shaker platform to perform horizontal reciprocating motion. The magnetic force monitor detects the magnetic properties of the discharged material and feeds back an electrical signal to the control terminal. The control terminal also adjusts the output excitation current according to the electrical signal to maintain the slurry magnetic properties within a preset range, thereby improving the demagnetizing effect.

Description

Technical Field

[0001] This application relates to the field of mineral processing and demagnetization technology, and in particular to a stepped coupling demagnetizing shaking table and its control method. Background Technology

[0002] When strongly magnetic minerals such as magnetite are separated in a magnetic field, in addition to the magnetization of the particles themselves, they also form agglomerates. After leaving the magnetic field, some of these agglomerates retain their agglomerate form. This magnetic agglomeration phenomenon not only reduces the efficiency of subsequent classification and screening operations, but also causes gangue minerals to be encapsulated and mixed within the magnetic agglomerates, affecting the production indicators of the magnetic separation process. If a reverse magnetic field is applied to the magnetic agglomerates, most of the residual magnetism in the magnetite ore can be removed; this process is called demagnetization (or demagnetization).

[0003] Traditional demagnetizers employ a tubular straight-through type. This type works by winding conductive coils around the outer tube wall and using voltage and current regulating devices to create a continuously changing magnetic field based on the principle of electromagnetic induction. When the slurry flows through the tubular straight-through demagnetizer, the residual magnetism of the slurry is reduced by the demagnetizing magnetic field, thus achieving demagnetization. However, because slurry flow rates vary under the influence of the magnetic field generated by the demagnetizer, the demagnetization effect of the tubular straight-through demagnetizer can be poor. Summary of the Invention

[0004] Therefore, it is necessary to provide a stepped coupling demagnetizing shaker and its control method that can improve the demagnetization effect in response to the above problems.

[0005] A stepped coupling demagnetizing shaking table includes: a control terminal, excitation coils, a shaking table platform, a magnetic force monitor, and a power unit. The shaking table platform is provided with a slurry inlet and a slurry outlet. The magnetic force monitor is located at the slurry outlet. The number of excitation coils is two or more, and each excitation coil is arranged sequentially along the slurry flow direction on the shaking table platform. The shaking table platform is inclined to the power unit. The control terminal is connected to the magnetic force monitor and the excitation coils.

[0006] The control terminal is used to output an excitation current to excite each of the excitation coils, generating a periodically oscillating and decaying magnetic field, forming a demagnetizing region with the magnetic field strength decreasing sequentially along the slurry flow direction. The power device is used to control the shaking table platform to perform horizontal reciprocating motion. After the slurry reaches the shaking table platform through the slurry inlet and undergoes planar flow demagnetization, it flows out through the slurry outlet. The magnetic force monitor is used to detect the magnetic properties of the discharged material and feed back an electrical signal to the control terminal. The control terminal also adjusts the output excitation current according to the electrical signal to maintain the slurry magnetic properties within a preset range.

[0007] In one embodiment, the power unit includes a power slide roller and a support frame, the power slide roller being mounted on the support frame, and the shaking table platform being inclinedly disposed on the power slide roller.

[0008] In one embodiment, the installation tilt angle of the shaking table platform is 3 to 6 degrees.

[0009] In one embodiment, the shaking table platform is also equipped with baffles spaced apart along the slurry flow direction.

[0010] In one embodiment, the height of the baffle is 1 mm to 2 mm, and / or the interval between two adjacent baffles is 1 cm to 3 cm.

[0011] In one embodiment, the baffle includes long baffles and short baffles that are alternately arranged along the slurry flow direction, and all the long baffles gradually increase in length along the slurry flow direction, and all the short baffles gradually increase in length along the slurry flow direction.

[0012] In one embodiment, the number of excitation coils is three, and according to the received excitation current, a strong demagnetization region, a moderate demagnetization region, and a weak demagnetization region are formed sequentially along the slurry flow direction.

[0013] In one embodiment, the ratio of the excitation current in the strong demagnetization region, the moderate demagnetization region, and the weak demagnetization region is 1:0.7:0.5.

[0014] In one embodiment, the control terminal includes a computer and an excitation control cabinet. The computer is connected to the magnetic monitor via a magnetic monitoring wire, and the excitation control cabinet is connected to the computer. The excitation control cabinet is connected to the excitation coil via an excitation connection line.

[0015] A step-coupling demagnetization control method, based on the above-mentioned step-coupling demagnetization shaking table, includes the following steps:

[0016] The system receives an electrical signal fed back from a magnetic force monitor; the electrical signal is obtained by the magnetic force monitor detecting the magnetic discharge of the slurry when it flows out of the slurry outlet after the slurry reaches the shaking table platform through the slurry inlet and undergoes planar flow demagnetization; the power unit controls the shaking table platform to perform horizontal reciprocating motion;

[0017] The excitation current output to the excitation coil is adjusted according to the electrical signal so that the slurry magnetism is maintained within a preset range; the excitation current is used to excite the excitation coil to generate a periodically oscillating and decaying magnetic field, forming a demagnetizing region where the magnetic field strength decreases sequentially along the slurry flow direction.

[0018] The aforementioned stepped coupling demagnetizing shaking table and control method involves sequentially arranging excitation coils along the slurry flow direction on the shaking table platform. An excitation current is output from the control terminal to energize each excitation coil, generating a periodically oscillating and decaying magnetic field. This creates demagnetizing regions where the magnetic field strength decreases sequentially along the slurry flow direction. A power unit controls the shaking table platform to perform horizontal reciprocating motion, causing the slurry to undergo planar flow demagnetization. Based on the electrical signal from the magnetic field monitoring device detecting the magnetic properties of the slurry in each demagnetizing region, the output excitation current is adjusted to maintain the slurry's magnetic properties within a preset range. Combining periodically oscillating and decaying current, multi-channel stepped excitation coils, and planar flow allows for highly efficient slurry demagnetization, effectively adapting to fluctuations in material magnetic properties and improving the demagnetization effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a ladder-coupled demagnetizing shaker in one embodiment;

[0020] Figure 2 This is a schematic diagram of the layout of the stepped coupling excitation coils in one embodiment;

[0021] Figure 3 This is a schematic diagram of the demagnetization working surface of the shaking table platform in one embodiment;

[0022] Figure 4 This is a flowchart illustrating a step-by-step demagnetization control method in one embodiment;

[0023] Figure 5 This is a schematic diagram of the demagnetization effect monitoring feedback adjustment process in one embodiment;

[0024] Figure 6 This is a schematic diagram of the periodically decaying excitation current and magnetic field in one embodiment;

[0025] Figure 7 This is a structural block diagram of a ladder coupling demagnetization control device in one embodiment;

[0026] Figure 8 This is an internal structural diagram of a computer device in one embodiment.

[0027] Explanation of reference numerals in the attached diagram: 1. Computer; 2. Excitation control cabinet; 3. Excitation connection; 4. Excitation coil; 5. Slurry inlet; 6. Shaking table platform; 7. Power roller; 8. Slurry outlet; 9. Magnetic force monitor; 10. Magnetic force monitoring wire; 11. Support frame. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0030] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0031] Iron ore is a crucial raw material for steel production. Generally, iron ore with a grade below 50% needs to undergo beneficiation to increase its grade before it can be smelted and utilized. The technique of separating and enriching minerals based on their magnetic differences is called magnetic separation. Magnetic separation is the most widely used technique for separating magnetic iron ore. In magnetic separation, the specific magnetic susceptibility of the material... χ >4.0×10 -5 m 3 Minerals with a density of / kg are called strongly magnetic minerals, and the magnetic separation intensity is (0.8~1.36)×10 5 These minerals can be recovered in a weak magnetic field separator with an A / m range. They mainly include magnetite, maghemite, titanomagnetite, pyrrhotite, and zinc iron spinel.

[0032] When strongly magnetic minerals such as magnetite are separated by magnetic field, in addition to the magnetization of the particles themselves, they also form agglomerates. Even after leaving the magnetic field, some of these agglomerates retain their clustered form. This magnetic agglomeration not only reduces the efficiency of subsequent classification and screening operations but also causes gangue minerals to be trapped within the magnetic agglomerates, affecting the production indicators of the magnetic separation process. Applying a reverse magnetic field to the magnetic agglomerates can remove most of the residual magnetism from the magnetite ore; this process is called demagnetization (or demagnetization). Depending on the magnetic field excitation principle and characteristics of the demagnetizer, the output power varies greatly, such as harmonic wave type, pulse type, etc. However, in actual mining operations, it has been found that the application of demagnetizers in mineral processing plants has limitations, and some effects are not ideal.

[0033] Currently, the mainstream demagnetizers are tubular straight-through type demagnetizers. These demagnetizers generate a continuously changing magnetic field based on the principle of electromagnetic induction by winding conductive coils around the outer tube wall and adjusting the applied voltage and current. When the slurry flows through the tubular straight-through type demagnetizer, the remanence of the slurry is reduced by the demagnetizing magnetic field, achieving demagnetization. However, according to fluid mechanics theory and Stokes' equations, the flow velocity in the laminar flow section of a circular pipe follows a parabolic distribution, and the slurry velocity is non-uniform. Slurries with different flow velocities exhibit varying effects under the magnetic field generated by the demagnetizer, resulting in a generally limited demagnetization effect for the tubular straight-through type demagnetizer. Based on this, this application provides a stepped coupling demagnetizing shaker and its control method. By utilizing periodic oscillating attenuated current, multi-channel stepped excitation coils, and planar flow, a stepped, controllable, periodic oscillating attenuated magnetic field can be formed on the demagnetizing working surface, achieving efficient demagnetization of the slurry. Furthermore, the assembly of discharge magnetic feedback adjustment control can effectively adapt to fluctuations in the magnetic properties of the material.

[0034] In one embodiment, such as Figure 1 As shown, a stepped coupling demagnetizing shaking table is provided, including: a control terminal, excitation coils 4, a shaking table platform 6, a magnetic force monitor 9, and a power unit. The shaking table platform 6 is provided with a slurry inlet 5 and a slurry outlet 8. The magnetic force monitor 9 is located at the slurry outlet 8. There are two or more excitation coils 4, and each excitation coil 4 is arranged sequentially along the slurry flow direction on the shaking table platform 6. The shaking table platform 6 is inclined and positioned on the power unit. The control terminal is connected to the magnetic force monitor 9 and the excitation coils 4. The control terminal is used to output an excitation current to excite each excitation coil 4, generating a periodically oscillating and decaying magnetic field, forming a demagnetizing region with the magnetic field strength decreasing sequentially along the slurry flow direction. The power unit is used to control the horizontal reciprocating motion of the shaking table platform 6. The slurry reaches the shaking table platform 6 through the slurry inlet 5, undergoes planar flow demagnetization, and then flows out through the slurry outlet 8. The magnetic force monitor 9 is used to detect the magnetic properties of the discharged material and feed back an electrical signal to the control terminal. The control terminal also adjusts the output excitation current according to the electrical signal to maintain the slurry magnetic properties within a preset range.

[0035] The specific structure of the control terminal is not unique and may include one or more controllers. In one embodiment, the control terminal includes a computer 1 and an excitation control cabinet 2. The computer 1 is connected to a magnetic monitor 9 via a magnetic monitoring wire 10, and the excitation control cabinet 2 is connected to the computer 1. The excitation control cabinet 2 is connected to the excitation coil 4 via an excitation connection 3. The computer 1 receives the electrical signal fed back from the magnetic monitor 9, generates a controllable current through the excitation control cabinet 2, and inputs it to the excitation coil 4 via the excitation connection 3 connected to the excitation control cabinet 2, generating a periodically oscillating decaying magnetic field. By controlling the excitation current value output to each excitation coil 4, the magnetic field strength of the demagnetizing region corresponding to each excitation coil 4 decreases sequentially along the slurry flow direction. The periodically oscillating decaying magnetic field is determined by the current value It, the decay period t, and the periodic oscillation frequency. For a slurry mainly composed of natural magnetite, the demagnetizing magnetic field strength is ensured to be above 48kA / m by adjusting the excitation current value. Specifically, a 50Hz AC current can be used to ensure that the magnetic field changes repeatedly more than 12 times within one cycle.

[0036] Furthermore, the upper and lower limits of the preset range are not unique. In one embodiment, the preset range is determined based on the magnetic threshold B0 and a preset error range. It is understood that the specific values ​​of the magnetic threshold B0 and the error range can be set according to actual needs. In this embodiment, the error range is 0.1 times the magnetic threshold B0, so the preset range is 0.9 times the magnetic threshold B0 to 1.1 times the magnetic threshold B0. The computer 1 determines the slurry magnetic field Bt based on the electrical signal fed back by the magnetic force monitor 9. If the slurry magnetic field Bt is greater than or equal to 0.9 times the magnetic threshold B0 and less than or equal to 1.1 times the magnetic threshold B0, the slurry magnetic field meets the requirements; if the slurry magnetic field Bt is greater than 1.1 times the magnetic threshold B0, the current value It is increased; if the slurry magnetic field Bt is less than 0.9 times the magnetic threshold B0, the current value It is decreased.

[0037] The specific number and arrangement of the excitation coils 4 are not unique; there can be two, three, or more excitation coils 4. Specifically, each excitation coil 4 can be supplied with a different excitation current, creating a demagnetizing region with a different magnetic field strength. Alternatively, some adjacent excitation coils 4 can be supplied with the same excitation current, forming a demagnetizing region with the same magnetic field strength. The excitation coils 4 can be located on the upper surface of the shaking table platform 6 or on the lower surface. In this embodiment, the excitation coils 4 are laid out in a "W"-shaped loop on the lower surface of the shaking table platform 6, forming demagnetizing regions with corresponding magnetic field strengths.

[0038] In one embodiment, the number of excitation coils 4 is three, and they sequentially form a strong demagnetization region, a moderate demagnetization region, and a weak demagnetization region along the slurry flow direction according to the received excitation current. Specifically, as shown... Figure 2 As shown, excitation line 3 connects to ports 3-1, 3-2, 3-3, 3-4, 3-5, and 3-6, forming three levels of demagnetization regions—strong, medium, and weak—with the three excitation coils. Ports 3-1 and 3-2, connected to the first excitation coil, form the strong demagnetization region; ports 3-3 and 3-4, connected to the second excitation coil, form the medium demagnetization region; and ports 3-5 and 3-6, connected to the third excitation coil, form the weak demagnetization region. It can be understood that in this embodiment, the demagnetization region is divided into three partitions: strong, medium, and weak. In other embodiments, the demagnetization region can be divided into other levels of partitions, depending on actual needs.

[0039] The slurry inlet 5 and slurry outlet 8 are respectively installed at the top and bottom of the shaking table platform 6. The slurry is fed into the shaking table platform 6 through the slurry inlet 5, reaching the upper surface of the shaking table platform 6, and sequentially passing through the strong demagnetization zone, the medium demagnetization zone, and the weak demagnetization zone. After demagnetization, it flows out through the slurry outlet 8. A magnetic force monitor 9 is installed on the slurry outlet 8, which can monitor the magnetic value Bt of the slurry online in real time and generate an electrical signal. The electrical signal is fed back to the computer 1 through the magnetic force monitoring wire 10. It can be understood that different slurries are suitable for different demagnetizing magnetic fields. The specific values ​​of the excitation current in the strong demagnetization zone, the medium demagnetization zone, and the weak demagnetization zone can be set according to actual needs. In this embodiment, the ratio of the excitation current in the strong demagnetization zone, the medium demagnetization zone, and the weak demagnetization zone is 1:0.7:0.5, realizing the step-like demagnetization of the slurry. In addition, the decay period t and the periodic oscillation frequency are the same in the strong demagnetization zone, the medium demagnetization zone, and the weak demagnetization zone.

[0040] The aforementioned stepped coupling demagnetizing shaker combines periodic oscillating decaying current, multi-channel stepped excitation coils, and planar flow to form a stepped, controllable, periodic oscillating decaying magnetic field on the demagnetizing working surface. This enables efficient demagnetization of the slurry. Furthermore, the assembly of magnetic feedback adjustment and control for discharge allows it to adapt well to fluctuations in the magnetic properties of materials, thus improving the demagnetization effect.

[0041] The specific structure of the power unit is not unique. In one embodiment, the power unit includes a power slide roller 7 and a support frame 11. The power slide roller 7 is mounted on the support frame 11, and the shaking table platform 6 is inclinedly arranged on the power slide roller 7. The power slide roller 7 may include two slide rollers of different heights. The two slide rollers are mounted on the support frame 11 to support the shaking table platform 6, so that the shaking table platform 6 is inclined. The structure is simple and reliable.

[0042] The installation tilt angle of the shaking table platform 6 is not unique and can be set according to actual needs. In one embodiment, the installation tilt angle of the shaking table platform 6 is 3 to 6 degrees to avoid the slurry flowing too fast due to an excessively high tilt angle, and to avoid the slurry flowing too slowly due to an excessively low tilt angle, thus ensuring the demagnetization effect while improving the demagnetization efficiency.

[0043] Furthermore, such as Figure 3 As shown, in one embodiment, the shaking table platform 6 is also equipped with baffles arranged at intervals along the slurry flow direction to slow down the slurry flow and further improve the demagnetization effect. The number, size, and arrangement of the baffles are not unique. In this embodiment, the height of the baffles is 1 mm to 2 mm to avoid the baffles being too high and obstructing the slurry, and to avoid the baffles being too low and failing to slow down the slurry flow. Furthermore, the interval between two adjacent baffles is 1 cm to 3 cm, which can better achieve the effect of slowing down the slurry flow. In this embodiment, the interval between two adjacent baffles is 2 cm.

[0044] In one embodiment, the baffles include alternating long and short baffles arranged along the slurry flow direction, with all long baffles gradually increasing in length along the slurry flow direction, and all short baffles gradually increasing in length along the slurry flow direction. Specifically, as... Figure 3 As shown, on the shaking table platform 6, from the slurry inlet 5 to the slurry outlet 8, a short baffle is set, then a long baffle is set, and then another short baffle is set, and so on, alternating. From the slurry inlet 5 to the slurry outlet 8, all the short baffles have a gradually increasing length, and all the long baffles also have a gradually increasing length. This can better slow down the slurry flow and improve the demagnetization effect.

[0045] In one embodiment, a step-coupling demagnetization control method is also provided, which is implemented based on the above-described step-coupling demagnetization shaking table, such as... Figure 4 As shown, the method includes:

[0046] Step S110: Receive the electrical signal fed back by the magnetic force monitor. The electrical signal is obtained by the magnetic force monitor when the slurry flows out of the slurry outlet after being demagnetized by planar flow through the slurry inlet to the shaking table platform; the power unit controls the shaking table platform to perform horizontal reciprocating motion.

[0047] Step S120: Adjust the excitation current output to the excitation coil according to the electrical signal to maintain the slurry magnetism within a preset range. The excitation current is used to excite the excitation coil, generating a periodically oscillating and decaying magnetic field, forming a demagnetizing region where the magnetic field strength decreases sequentially along the slurry flow direction.

[0048] It is understood that the specific implementation method of the above-mentioned step-coupling demagnetization control method has been explained in detail in the above-mentioned step-coupling demagnetization shaker, and will not be repeated here.

[0049] To facilitate a better understanding of the above-described stepped coupling demagnetizing rocker and control method, a detailed explanation is provided below with reference to specific embodiments.

[0050] Reference Figure 1 The stepped coupling demagnetizing shaking table includes a computer 1, an excitation control cabinet 2, an excitation connection line 3, an excitation coil 4, a slurry inlet 5, a shaking table platform 6, a power sliding roller 7, a slurry outlet 8, a magnetic force monitor 9, a magnetic force monitoring wire 10, and a support frame 11. The computer 1 is connected to the excitation control cabinet 2 to form an integrated control terminal. A controllable current is generated through the excitation control cabinet 2 and input to the excitation coil 4 via the excitation connection line 3 connected to the excitation control cabinet 2.

[0051] Reference Figure 1 and Figure 2 The excitation line 3 connects to six ports 3-1, 3-2, 3-3, 3-4, 3-5, and 3-6, forming a magnetic field of three levels of strength (strong, medium, and weak) with the excitation coil 4. The excitation coil 4 is laid flat on the lower surface of the shaking table platform 6 in a "W"-shaped loop.

[0052] Reference Figure 1 and Figure 3 The powered sliding roller 7 is mounted on the support frame 11. The shaking table platform 6 is mounted at an inclination on the powered sliding roller 7, enabling horizontal reciprocating motion; the tilt angle of the shaking table platform 6 is 3°–6°. The top of the shaking table platform 6 is equipped with a slurry inlet 5, and the bottom is equipped with a slurry outlet 8; the table surface of the shaking table platform 6 is equipped with baffles with a height of 1mm–2mm, and adjacent baffles are spaced 2cm apart to slow down the flow of slurry.

[0053] Reference Figure 1 The magnetic force monitor 9 is installed on the slurry outlet 8. It can monitor the magnetic value Bt of the slurry in real time and generate an electrical signal. The electrical signal is fed back to the computer 1 through the magnetic force monitoring wire 10.

[0054] Reference Figure 5 The demagnetization effect monitoring and feedback adjustment process of the cascade coupling demagnetizing shaker is as follows: The slurry is fed into the demagnetizing shaker, and excitation is performed by controlling the current value It. Then, the magnetic flux Bt of the discharged slurry is detected. If the magnetic flux Bt of the slurry is between 0.9 and 1.1 times the magnetic threshold B0, the demagnetization of the slurry is completed and the slurry is discharged. If the magnetic flux Bt of the slurry is greater than 1.1 times the magnetic threshold B0, the current value It is increased in the next stage control. If the magnetic flux Bt of the slurry is less than 0.9 times the magnetic threshold B0, the current value It is decreased in the next stage control.

[0055] Reference Figure 6The periodic oscillating decaying magnetic field is determined by the current value It, the decay period t, and the periodic oscillation frequency. Different demagnetizing magnetic fields are suitable for different slurries. The excitation current ratio for the three demagnetizing regions (strong, medium, and weak) is 1:0.7:0.5; the decay period t and the periodic oscillation frequency are the same for all three demagnetizing regions.

[0056] The demagnetization process is described as follows:

[0057] Step 1: Computer 1 and excitation control cabinet 2 generate a control excitation current to excite excitation coil 4, producing a periodically oscillating and decaying magnetic field. For slurry mainly composed of natural magnetite, the demagnetizing magnetic field strength should be above 48kA / m, using 50Hz AC current, ensuring that the magnetic field changes repeatedly more than 12 times within one cycle.

[0058] Step two, the shaking table platform 6 is driven by the power sliding roller 7 to perform reciprocating horizontal shaking.

[0059] Step 3: A slurry with a mass concentration of 30%-40% is fed into the shaking table platform 6 through the slurry inlet 5. It is demagnetized by a periodically oscillating and decaying magnetic field in a planar flow manner. The time for the slurry to enter and leave the shaking table platform for demagnetization should be greater than 0.24 s. Magnetic particles of different sizes form distinct regions on the shaking table surface, corresponding to specific magnetic fields with strong, medium, and weak gradient coupling for demagnetization.

[0060] Step four: The demagnetized slurry is discharged through slurry outlet 8. During the discharge process, the magnetic field Bt of the discharged slurry is detected by magnetic field monitor 9. If the magnetic field Bt of the slurry is between 0.9 and 1.1 times the magnetic threshold B0, it indicates that the magnetic properties of the demagnetized slurry product are qualified, and the slurry can be continuously fed in. If the magnetic field Bt of the slurry is greater than 1.1 times the magnetic threshold B0, the current value It is increased in the upper-level control. If the magnetic field Bt of the slurry is less than 0.9 times the magnetic threshold B0, the current value It is decreased in the upper-level control.

[0061] To address the technical problems of poor demagnetization effect and lack of feedback correction control methods in the tubular straight-through demagnetizer equipment currently used in mainstream ore dressing plants, this application proposes a stepped coupling demagnetizing shaking table and control method. The slurry is demagnetized by planar flow on a reciprocating shaking table platform 6. Excitation coils 4 are laid flat at the bottom of the shaking table platform 6 in a "W"-shaped loop, forming a coupled magnetic field with three stepped strengths: strong, medium, and weak. The generated periodically oscillating decaying magnetic field is suitable for different magnetic ores and can be controlled by the current value It, the current period t, and the periodic oscillation frequency. By utilizing the periodically oscillating decaying current, the multi-channel stepped arrangement of excitation coils, and the planar flow method, a stepped, controllable periodically oscillating decaying magnetic field can be formed on the demagnetizing working surface, achieving efficient demagnetization of the slurry. Furthermore, the addition of magnetic feedback adjustment control at the discharge point effectively adapts to fluctuations in the magnetic properties of the material.

[0062] Based on the same inventive concept, this application also provides a ladder coupling demagnetization control device for implementing the ladder coupling demagnetization control method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more embodiments of the ladder coupling demagnetization control device provided below can be found in the limitations of the ladder coupling demagnetization control method described above, and will not be repeated here.

[0063] In one embodiment, such as Figure 7 As shown, a step-coupling demagnetization control device is provided, which is based on the above-mentioned step-coupling demagnetization shaking table, and includes:

[0064] The signal receiving module 110 is used to receive the electrical signal fed back by the magnetic force monitor. The electrical signal is obtained by the magnetic force monitor when the slurry flows out of the slurry outlet after being demagnetized by planar flow through the slurry inlet to the shaking table platform; the power unit controls the shaking table platform to perform horizontal reciprocating motion.

[0065] The current regulation module 120 is used to regulate the excitation current output to the excitation coil according to the electrical signal so that the slurry magnetism is maintained within a preset range; the excitation current is used to excite the excitation coil, generating a periodically oscillating decaying magnetic field, forming a demagnetizing region where the magnetic field strength decreases sequentially along the slurry flow direction.

[0066] Each module in the aforementioned cascade coupling demagnetization control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0067] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 8As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores data. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a cascaded coupling demagnetization control method.

[0068] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method described above.

[0069] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0070] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the method described above.

[0071] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A stepped coupling demagnetizing shaker, characterized in that, include: The device includes a control terminal, excitation coils, a shaking table platform, a magnetic force monitor, and a power unit. The shaking table platform has a slurry inlet and a slurry outlet. The magnetic force monitor is located at the slurry outlet. There are two or more excitation coils, and each excitation coil is arranged sequentially along the slurry flow direction on the shaking table platform. The shaking table platform is inclined to the power unit. The control terminal is connected to the magnetic force monitor and the excitation coils. The control terminal is used to output an excitation current to excite each of the excitation coils, generating a periodically oscillating and decaying magnetic field, forming a demagnetizing region with the magnetic field strength decreasing sequentially along the slurry flow direction. The power device is used to control the shaking table platform to perform horizontal reciprocating motion. After the slurry reaches the shaking table platform through the slurry inlet and undergoes planar flow demagnetization, it flows out through the slurry outlet. The magnetic force monitor is used to detect the magnetic properties of the discharged material and feed back an electrical signal to the control terminal. The control terminal also adjusts the output excitation current according to the electrical signal to maintain the slurry magnetic properties within a preset range. The periodic oscillating decaying magnetic field is determined by the current value It, the decay period t, and the periodic oscillation frequency, with a preset range of 0.9 times the magnetic threshold B0 to 1.1 times the magnetic threshold B0. If the slurry magnetic field Bt is greater than or equal to 0.9 times the magnetic threshold B0 and less than or equal to 1.1 times the magnetic threshold B0, the slurry magnetic field meets the requirements. If the slurry magnetic field Bt is greater than 1.1 times the magnetic threshold B0, the current value It is increased. If the slurry magnetic field Bt is less than 0.9 times the magnetic threshold B0, the current value It is decreased. The shaking table platform is also equipped with baffles arranged at intervals along the slurry flow direction. The baffles include long baffles and short baffles that are alternately arranged along the slurry flow direction, and all long baffles gradually increase in length along the slurry flow direction, and all short baffles gradually increase in length along the slurry flow direction. The height of the baffles is 1 mm to 2 mm, and the interval between two adjacent baffles is 1 cm to 3 cm.

2. The ladder-coupled demagnetizing shaker according to claim 1, characterized in that, The power unit includes a power slide roller and a support frame. The power slide roller is mounted on the support frame, and the shaking table platform is inclined to the power slide roller.

3. The ladder-coupled demagnetizing shaker according to claim 2, characterized in that, The installation tilt angle of the shaking table platform is 3 to 6 degrees.

4. The ladder-coupled demagnetizing shaker according to claim 1, characterized in that, The number of excitation coils is three, and according to the received excitation current, they sequentially form a strong demagnetization region, a medium demagnetization region, and a weak demagnetization region along the slurry flow direction.

5. The ladder-coupled demagnetizing shaker according to claim 4, characterized in that, The ratio of the excitation current in the strong demagnetization region, the moderate demagnetization region, and the weak demagnetization region is 1:0.7:0.

5.

6. The ladder-coupled demagnetizing shaker according to any one of claims 1-5, characterized in that, The control unit includes a computer and an excitation control cabinet. The computer is connected to the magnetic monitor via a magnetic monitoring wire, and the excitation control cabinet is connected to the computer. The excitation control cabinet is connected to the excitation coil via an excitation connection line.

7. A step-coupling demagnetization control method, characterized in that, Based on the ladder-coupled demagnetizing rocker according to any one of claims 1-6, the method includes: The system receives an electrical signal fed back from a magnetic force monitor; the electrical signal is obtained by the magnetic force monitor detecting the magnetic discharge of the slurry when it flows out of the slurry outlet after the slurry reaches the shaking table platform through the slurry inlet and undergoes planar flow demagnetization; the power unit controls the shaking table platform to perform horizontal reciprocating motion; The excitation current output to the excitation coil is adjusted according to the electrical signal so that the slurry magnetism is maintained within a preset range; the excitation current is used to excite the excitation coil to generate a periodically oscillating and decaying magnetic field, forming a demagnetizing region where the magnetic field strength decreases sequentially along the slurry flow direction. The periodic oscillating decaying magnetic field is determined by the current value It, the decay period t, and the periodic oscillation frequency, with a preset range of 0.9 times the magnetic threshold B0 to 1.1 times the magnetic threshold B0. If the slurry magnetic field Bt is greater than or equal to 0.9 times the magnetic threshold B0 and less than or equal to 1.1 times the magnetic threshold B0, the slurry magnetic field meets the requirements. If the slurry magnetic field Bt is greater than 1.1 times the magnetic threshold B0, the current value It is increased. If the slurry magnetic field Bt is less than 0.9 times the magnetic threshold B0, the current value It is decreased.

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