Step-coupled demagnetization device and control method

Abstract

The application relates to a step coupling demagnetization device and a control method, the step coupling demagnetization device comprising a control end, a magnetic force monitor, a demagnetization pipeline and excitation coils, the demagnetization pipeline is provided with a slurry inlet and a slurry outlet, the number of the excitation coils is two or more than two, and each excitation coil is arranged in the demagnetization pipeline in sequence along the slurry flow direction, and the control end is connected with the magnetic force monitor and the excitation coils; the control end is used for outputting excitation currents to excite each excitation coil, generating a periodic oscillation decay magnetic field, forming a demagnetization area with a magnetic field strength gradually decreasing along the slurry flow direction; the slurry enters the demagnetization pipeline through the slurry inlet, is demagnetized and then flows out through the slurry outlet; the magnetic force monitor is used for magnetically detecting the slurry in each demagnetization area and feeding back an electric signal to the control end, and the control end further adjusts the output excitation current according to the electric signal, so that the slurry magnetism in each demagnetization area is maintained in a corresponding preset range, and the demagnetization effect is improved.

Description

Technical Field

[0001] This application relates to the field of mineral processing and demagnetization technology, and in particular to a cascade coupling demagnetization device and 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 step-coupling demagnetizing device and control method that can improve the demagnetizing effect in order to address the above problems.

[0005] A cascade coupling demagnetizing device includes: a control terminal, a magnetic force monitor, a demagnetizing pipe, and an excitation coil. The demagnetizing pipe is provided with a slurry inlet and a slurry outlet. The number of excitation coils is two or more, and each excitation coil is arranged sequentially along the slurry flow direction in the demagnetizing pipe. The control terminal is connected to the magnetic force monitor and the excitation coil.

[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 slurry enters the demagnetizing pipe through the slurry inlet for demagnetization and then flows out through the slurry outlet; the magnetic force monitor is used to detect the magnetic properties of the slurry in each of the demagnetizing regions 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 magnetic properties of the slurry in each of the demagnetizing regions within the corresponding preset range.

[0007] In one embodiment, the control terminal gradually adjusts the excitation current of the excitation coil corresponding to each demagnetized region along the slurry flow direction according to the electrical signal obtained by detecting the magnetic properties of the slurry in each demagnetized region, so as to maintain the magnetic properties of the slurry in each demagnetized region within the corresponding preset range.

[0008] 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.

[0009] 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.

[0010] In one embodiment, the excitation coil is spirally wound around the outside of the demagnetizing pipe.

[0011] In one embodiment, the magnetic monitoring device is positioned at the tail end of each of the demagnetizing zones along the slurry flow direction.

[0012] In one embodiment, the preset range corresponding to each demagnetization region is determined based on the magnetic threshold corresponding to each demagnetization region and a preset error range.

[0013] 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.

[0014] A step-coupling demagnetization control method, based on the aforementioned step-coupling demagnetization device, includes the following steps:

[0015] The system receives electrical signals fed back from a magnetic force monitor; these signals are obtained by the magnetic force monitor detecting the magnetic properties of the slurry in each demagnetization zone when the slurry enters the demagnetization pipeline through the slurry inlet for demagnetization.

[0016] The excitation current output to the excitation coil is adjusted according to the electrical signal so that the slurry magnetism in each of the demagnetizing regions is maintained within the corresponding preset range; the excitation current is used to excite the excitation coil to generate a periodically oscillating decaying magnetic field, forming a demagnetizing region with the magnetic field strength decreasing sequentially along the slurry flow direction.

[0017] In one embodiment, adjusting the excitation current output to the excitation coil according to the electrical signal to maintain the slurry magnetism in each of the demagnetized regions within a corresponding preset range includes: gradually adjusting the excitation current of the excitation coil corresponding to each of the demagnetized regions along the slurry flow direction according to the electrical signal obtained by detecting the magnetism of the slurry in each of the demagnetized regions, so as to maintain the slurry magnetism in each of the demagnetized regions within a corresponding preset range.

[0018] The aforementioned tiered coupling demagnetizing device and control method involves sequentially arranging excitation coils along the slurry flow direction in the demagnetizing pipeline. 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. The output excitation current is adjusted based on the feedback signal from a magnetic field monitor detecting the magnetic properties of the slurry in each demagnetizing region, ensuring that the magnetic properties of the slurry in each demagnetizing region remain within a preset range. Combining periodically oscillating and decaying current, multi-channel tiered excitation coil arrangement, and demagnetizing feedback adjustment achieves highly efficient slurry demagnetization, effectively adapting to fluctuations in material magnetic properties and improving the demagnetizing effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a ladder coupling demagnetizing device in one embodiment;

[0020] Figure 2 This is a schematic diagram of the tiered coupling demagnetizing device in another embodiment;

[0021] Figure 3 This is a flowchart illustrating a step-by-step demagnetization control method in one embodiment;

[0022] Figure 4 This is a schematic diagram of the demagnetization effect monitoring feedback adjustment process in one embodiment;

[0023] Figure 5 This is a schematic diagram of the periodically decaying excitation current and magnetic field in one embodiment;

[0024] Figure 6 This is a structural block diagram of a ladder coupling demagnetization control device in one embodiment;

[0025] Figure 7 This is an internal structural diagram of a computer device in one embodiment.

[0026] Explanation of reference numerals in the attached diagram: 1. Computer; 2. Excitation control cabinet; 3. Excitation connection; 4. Slurry inlet; 5. Excitation coil; 6. Magnetic force monitor; 7. Slurry outlet; 8. Magnetic force monitoring wire; 9. Demagnetization pipe. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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 cross-section of a circular pipe follows a parabolic distribution, and the slurry velocity is non-uniform. Slurries with different flow velocities experience varying effects under the magnetic field generated by the demagnetizer, resulting in a generally limited demagnetization effect for the tubular straight-through type demagnetizer. Therefore, this application provides a stepped coupling demagnetizing device and control method. By utilizing periodically oscillating attenuated current, multi-channel stepped excitation coils, and demagnetization feedback adjustment, a stepped, controllable, periodically oscillating attenuated magnetic field can be formed on the demagnetizing working surface. This enables efficient demagnetization of the slurry and effectively adapts to fluctuations in the magnetic properties of the material.

[0033] In one embodiment, such as Figure 1 As shown, a stepped coupling demagnetizing device is provided, including: a control terminal, a magnetic field monitor 6, a demagnetizing pipe 9, and excitation coils 5. The demagnetizing pipe 9 is provided with a slurry inlet 4 and a slurry outlet 7. The number of excitation coils 5 is two or more, and each excitation coil 5 is arranged sequentially along the slurry flow direction in the demagnetizing pipe 9. The control terminal is connected to the magnetic field monitor 6 and the excitation coils 5. The control terminal is used to output an excitation current to excite each excitation coil 5, 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 slurry enters the demagnetizing pipe 9 through the slurry inlet 4 for demagnetization and then flows out through the slurry outlet 7. The magnetic field monitor 6 is used to detect the magnetic properties of the slurry in each demagnetizing region 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 magnetic properties of the slurry in each demagnetizing region within the corresponding preset range.

[0034] 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 6 via a magnetic monitoring wire 8, and the excitation control cabinet 2 is connected to the computer 1. The excitation control cabinet 2 is connected to the excitation coil 5 via an excitation connection 3. The computer 1 receives the electrical signal fed back from the magnetic monitor 6, generates a controllable current through the excitation control cabinet 2, and inputs it to the excitation coil 5 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 5, the magnetic field strength of the demagnetizing region corresponding to each excitation coil 5 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.

[0035] Furthermore, the upper and lower limits of the preset range are not unique. In one embodiment, the preset range corresponding to each demagnetization region is determined based on the magnetic threshold corresponding to each demagnetization region and the preset error range. It can be understood that the specific values ​​of the magnetic threshold and the error range can be set according to actual needs. In this embodiment, if the error range is 0.1 times the magnetic threshold, then the preset range is 0.9 times the magnetic threshold - 1.1 times the magnetic threshold. The computer 1 can determine the slurry magnetic flux Bt in the corresponding demagnetization region based on the electrical signal fed back by the magnetic force monitor 6. If the slurry magnetic flux Bt is greater than or equal to 0.9 times the magnetic threshold and less than or equal to 1.1 times the magnetic threshold, then the slurry magnetic flux meets the requirements; if the slurry magnetic flux Bt is greater than 1.1 times the magnetic threshold, then the current value It is increased; if the slurry magnetic flux Bt is less than 0.9 times the magnetic threshold, then the current value It is decreased.

[0036] The specific number and arrangement of the excitation coils 5 are not unique; the number of excitation coils 5 can be two, three, or more. Specifically, each excitation coil 5 can be supplied with a different excitation current, causing each excitation coil 5 to form a demagnetization region with a different magnetic field strength. Alternatively, some adjacent excitation coils 5 can be supplied with the same excitation current, forming a demagnetization region with the same magnetic field strength. The excitation coils 5 can be located inside or outside the demagnetization pipe 9. In one embodiment, the excitation coils 5 are spirally wound around the outside of the demagnetization pipe 9. Specifically, each excitation coil 5 is spirally wound around the outside of the demagnetization pipe 9 in an "S"-shaped loop, forming a demagnetization region with a corresponding magnetic field strength. The location of the magnetic force monitor 6 is also not unique; it can be located in the middle or at the end of each demagnetization region along the slurry flow direction. In this embodiment, the magnetic force monitor 6 is located at the end of each demagnetization region along the slurry flow direction, which can accurately detect the magnetism of the slurry after passing through each demagnetization region.

[0037] The aforementioned stepped coupling demagnetizing device combines periodic oscillating decaying current, multi-channel stepped excitation coils, and demagnetizing feedback adjustment. It can form a stepped distributed periodic oscillating decaying magnetic field with controllable intensity on the demagnetizing working surface, which can achieve efficient demagnetization of slurry and can well adapt to the fluctuation of material magnetic differences, thus improving the demagnetizing effect.

[0038] In one embodiment, the control terminal gradually adjusts the excitation current of the excitation coil 5 corresponding to each demagnetized region along the slurry flow direction based on the electrical signal obtained from the magnetic detection of the slurry in each demagnetized region, so as to maintain the magnetic properties of the slurry in each demagnetized region within the corresponding preset range. By performing progressive detection control on each demagnetized region along the slurry flow direction, the slurry flows through each demagnetized region during the demagnetization process within the corresponding preset range.

[0039] In one embodiment, such as Figure 2As shown, there are three excitation coils 5, which sequentially form a strong demagnetization region, a medium demagnetization region, and a weak demagnetization region along the slurry flow direction according to the received excitation current. Specifically, the excitation coils 5 include excitation coils 5-1, 5-2, and 5-3. The excitation connection 3 connects to ports 3-1, 3-2, 3-3, 3-4, 3-5, and 3-6, respectively, forming three levels of demagnetization regions of strong, medium, and weak intensity with excitation coils 5-1, 5-2, and 5-3. Ports 3-1 and 3-2 connected to excitation coil 5-1 form the strong demagnetization region, ports 3-3 and 3-4 connected to excitation coil 5-2 form the medium demagnetization region, and ports 3-5 and 3-6 connected to excitation coil 5-3 form the weak demagnetization region. It is understood that in this embodiment, the demagnetization area is divided into three partitions: a strong demagnetization area, a moderate demagnetization area, and a weak demagnetization area. In other embodiments, the demagnetization area can also be divided into partitions of other levels, which can be set according to actual needs.

[0040] The slurry is fed into the demagnetizing pipe 9 through the slurry inlet 4 on the left side, and passes sequentially through the strong demagnetizing zone, the medium demagnetizing zone, and the weak demagnetizing zone. After demagnetization, it flows out through the slurry outlet 7. On the demagnetizing pipe 9, each demagnetizing zone is equipped with a magnetic field monitor 6. Magnetic field monitors 6-1, 6-2, and 6-3 are arranged sequentially to detect the magnetism of the slurry inside the demagnetizing pipe 9, corresponding to the three levels of strong, medium, and weak demagnetizing intensity. These monitors generate electrical signals that are fed back to the computer 1 via the magnetic field monitoring wire 8. It is understood that different slurries require different demagnetizing magnetic fields. The specific values ​​of the excitation current in the strong, medium, and weak demagnetizing zones can be set according to actual needs. In this embodiment, the ratio of the excitation current in the strong, medium, and weak demagnetizing zones is 1:0.7:0.5, achieving step-wise demagnetization of the slurry. Furthermore, the decay period t and periodic oscillation frequency are the same in the strong demagnetization region, the moderate demagnetization region, and the weak demagnetization region.

[0041] In one embodiment, a step-coupling demagnetization control method is also provided, implemented based on the aforementioned step-coupling demagnetization device, such as... Figure 3 As shown, the method includes:

[0042] Step S110: Receive the electrical signal fed back by the magnetic monitoring device. The electrical signal is obtained by the magnetic monitoring device detecting the magnetic properties of the slurry in each demagnetization area when the slurry enters the demagnetization pipeline through the slurry inlet for demagnetization.

[0043] Step S120: Adjust the excitation current output to the excitation coil according to the electrical signal to maintain the slurry magnetism in each demagnetization zone within the corresponding preset range. The excitation current is used to excite the excitation coil, generating a periodically oscillating and decaying magnetic field, forming demagnetization zones with decreasing magnetic field strength along the slurry flow direction.

[0044] In one embodiment, step S120 includes: adjusting the excitation current of the excitation coil corresponding to each demagnetized region along the slurry flow direction according to the electrical signal obtained by magnetic detection of the slurry in each demagnetized region, so as to maintain the magnetic properties of the slurry in each demagnetized region within the corresponding preset range.

[0045] It is understood that the specific implementation method of the above-mentioned cascade coupling demagnetization control method has been explained in detail in the above-mentioned cascade coupling demagnetization device, and will not be repeated here.

[0046] To facilitate a better understanding of the above-described tiered coupling demagnetizing device and control method, a detailed explanation is provided below with reference to specific embodiments.

[0047] Reference Figure 2 The cascade coupling demagnetizing device includes a computer 1, an excitation control cabinet 2, an excitation connection line 3, a slurry inlet 4, an excitation coil 5, a magnetic force monitor 6, a slurry outlet 7, a magnetic force monitoring wire 8, and a demagnetizing pipe 9. 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 5 via the excitation connection line 3 connected to the excitation control cabinet 2.

[0048] The 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—together with excitation coils 5-1, 5-2, and 5-3. Ports 3-1 and 3-2 connected to excitation coil 5-1 form the strong demagnetization region; ports 3-3 and 3-4 connected to excitation coil 5-2 form the medium demagnetization region; and ports 3-5 and 3-6 connected to excitation coil 5-3 form the weak demagnetization region. The excitation coil 5 is spirally wound around the outside of the demagnetization pipe 9.

[0049] The slurry is fed into the demagnetizing pipe 9 through the slurry inlet 4 on the left side, and passes through the strong demagnetizing zone, the medium demagnetizing zone, and the weak demagnetizing zone in sequence. After demagnetization, it flows out through the slurry outlet 7. On the demagnetizing pipe 9, each demagnetizing zone is equipped with a magnetic field monitor 6. Magnetic field monitors 6-1, 6-2, and 6-3 are arranged sequentially to detect the magnetism of the slurry inside the demagnetizing pipe 9, corresponding to the three levels of strong, medium, and weak demagnetizing intensity. The generated electrical signals are fed back to the computer 1 through the magnetic field monitoring wire 8.

[0050] Reference Figure 2 and Figure 4 The monitoring, feedback, and adjustment process for the demagnetization effect of the cascaded coupling demagnetizing pipe is as follows: The slurry is fed into the demagnetizing pipe 9 and sequentially passes through the high-intensity demagnetizing zone, the medium-intensity demagnetizing zone, and the low-intensity demagnetizing zone for demagnetization. The excitation current value Ia in the high-intensity demagnetizing zone is set to the discharge magnetic threshold B1; the excitation current value Ib in the high-intensity demagnetizing zone is set to the discharge magnetic threshold B2; and the excitation current value Ic in the high-intensity demagnetizing zone is set to the discharge magnetic threshold B3.

[0051] Reference Figure 4 Demagnetization control in the intensity demagnetization zone: Excitation is performed by controlling the current value Ia, followed by detection of the discharge magnetic field Bt. If the slurry magnetic field Bt is between 0.9 and 1.1 times the magnetic threshold B1, the slurry demagnetization and discharge are completed; if the slurry magnetic field Bt is greater than 1.1 times the magnetic threshold B1, the current value Ia is increased in the next higher level control; if the slurry magnetic field Bt is less than 0.9 times the magnetic threshold B1, the current value Ia is decreased in the next higher level control.

[0052] Reference Figure 4 Demagnetization control in the moderate demagnetization zone: Excitation is performed by controlling the current value Ib, followed by detection of the discharge magnetic field Bt. If the slurry magnetic field Bt is between 0.9 and 1.1 times the magnetic threshold B2, the slurry demagnetization and discharge are completed; if the slurry magnetic field Bt is greater than 1.1 times the magnetic threshold B2, the current value Ib is increased in the next higher control stage; if the slurry magnetic field Bt is less than 0.9 times the magnetic threshold B2, the current value Ib is decreased in the next higher control stage.

[0053] Reference Figure 4 Demagnetization control in the weak demagnetization zone: Excitation is performed by controlling the current value Ic, followed by detection of the discharge magnetic field Bt. If the slurry magnetic field Bt is between 0.9 and 1.1 times the magnetic threshold B3, the slurry demagnetization and discharge are completed; if the slurry magnetic field Bt is greater than 1.1 times the magnetic threshold B3, the current value Ic is increased in the next higher control stage; if the slurry magnetic field Bt is less than 0.9 times the magnetic threshold B3, the current value Ic is decreased in the next higher control stage.

[0054] Reference Figure 5 The 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 of the strong demagnetizing region, the medium demagnetizing region, and the weak demagnetizing region is 1:0.7:0.5; the decay period t and the periodic oscillation frequency are the same in the three demagnetizing regions.

[0055] The demagnetization process is described as follows:

[0056] Step 1: Computer 1 and excitation control cabinet 2 generate a control excitation current to excite excitation coil 5, 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.

[0057] Step two: Slurry with a mass concentration of 30%-40% is fed into demagnetizing pipe 9 through slurry inlet 4, and demagnetized sequentially through three periodically oscillating decaying magnetic fields: a strong demagnetizing zone, a medium demagnetizing zone, and a weak demagnetizing zone. The time for the slurry to enter and exit the shaking table platform for demagnetization should be greater than 0.24 seconds.

[0058] Step four: The demagnetized slurry is discharged through slurry outlet 7. During the demagnetization process, the magnetic flux density (Bt) of the slurry is detected by the magnetic force monitors 6 in the three demagnetization zones. If the magnetic flux density (Bt) of the slurry is between 0.9 and 1.1 times the magnetic threshold, the demagnetization and discharge of the slurry is completed; if the magnetic flux density (Bt) of the slurry is greater than 1.1 times the magnetic threshold, the current value is increased in the next stage of control; if the magnetic flux density (Bt) of the slurry is less than 0.9 times the magnetic threshold, the current value is decreased in the next stage of control.

[0059] 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 mineral processing plants, this application proposes a stepped coupling demagnetization device and control method. The excitation coil 5 is spirally wound in an "S"-shaped loop around the outside of the pipe, 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 the excitation coil, and the progressive detection control method, a stepped, controllable periodically oscillating decaying magnetic field can be formed on the demagnetization working face, achieving efficient demagnetization of the slurry and effectively adapting to fluctuations in the magnetic properties of the material.

[0060] 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.

[0061] In one embodiment, such as Figure 6 As shown, a step-coupling demagnetization control device is provided, which is based on the above-mentioned step-coupling demagnetization device and includes:

[0062] 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 detecting the magnetic properties of the slurry in each demagnetization area when the slurry enters the demagnetization pipeline through the slurry inlet for demagnetization.

[0063] The current regulation module 120 is used to adjust the excitation current output to the excitation coil according to the electrical signal, so as to maintain the slurry magnetism in each demagnetization zone within the corresponding preset range. The excitation current is used to excite the excitation coil, generating a periodically oscillating and decaying magnetic field, forming demagnetization zones with successively decreasing magnetic field strength along the slurry flow direction.

[0064] In one embodiment, the current regulating module 120 gradually adjusts the excitation current of the excitation coil corresponding to each demagnetized region along the slurry flow direction according to the electrical signal obtained by detecting the magnetic properties of the slurry in each demagnetized region, so as to maintain the magnetic properties of the slurry in each demagnetized region within the corresponding preset range.

[0065] 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.

[0066] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 7 As 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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 device, characterized in that, include: Control terminal, magnetic field monitor, demagnetizing conduit and excitation wire The demagnetizing pipe is provided with a slurry inlet and a slurry outlet. The number of excitation coils is two or more, and each excitation coil is arranged sequentially along the slurry flow direction in the demagnetizing pipe. The control terminal is connected to the magnetic force monitor and the excitation coils. The control terminal outputs an excitation current to excite each of the excitation coils, generating a periodically oscillating and decaying magnetic field, forming demagnetizing regions where the magnetic field strength decreases sequentially along the slurry flow direction. The slurry enters the demagnetizing pipe through the slurry inlet for demagnetization and then flows out through the slurry outlet. The magnetic field monitor detects the magnetism of the slurry in each of the demagnetizing regions and feeds back an electrical signal to the control terminal. The control terminal also adjusts the output excitation current based on the electrical signal to maintain the magnetism of the slurry in each of the demagnetizing regions within a corresponding preset range. 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.

2. The ladder-coupled demagnetizing device according to claim 1, characterized in that, The control terminal gradually adjusts the excitation current of the excitation coil corresponding to each demagnetized region along the slurry flow direction according to the electrical signal obtained by detecting the magnetic properties of the slurry in each demagnetized region, so as to maintain the magnetic properties of the slurry in each demagnetized region within the corresponding preset range.

3. The step-coupling demagnetizing device according to claim 2, 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.

4. The step-coupling demagnetizing device according to claim 1, characterized in that, The excitation coil is spirally wound around the outside of the demagnetizing pipe.

5. The step-coupling demagnetizing device according to claim 1, characterized in that, The magnetic monitoring device is positioned at the tail end of each demagnetization zone along the slurry flow direction.

6. The step-coupling demagnetizing device according to claim 1, characterized in that, The preset range corresponding to each of the demagnetization regions is determined based on the magnetic threshold corresponding to each of the demagnetization regions and the preset error range.

7. The step-coupling demagnetizing device according to any one of claims 1-6, 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.

8. A step-coupling demagnetization control method, characterized in that, Based on the ladder coupling demagnetizing device according to any one of claims 1-7, the method includes: The system receives electrical signals fed back from a magnetic force monitor; these signals are obtained by the magnetic force monitor detecting the magnetic properties of the slurry in each demagnetization zone when the slurry enters the demagnetization pipeline through the slurry inlet for demagnetization. The excitation current output to the excitation coil is adjusted according to the electrical signal so that the slurry magnetism in each of the demagnetizing regions is maintained within the corresponding preset range; the excitation current is used to excite the excitation coil to generate a periodically oscillating decaying magnetic field, forming a demagnetizing region with the magnetic field strength decreasing sequentially along the slurry flow direction.

9. The step-coupling demagnetization control method according to claim 8, characterized in that, The step of adjusting the excitation current output to the excitation coil according to the electrical signal so that the slurry magnetism in each of the demagnetized regions is maintained within the corresponding preset range includes: gradually adjusting the excitation current of the excitation coil corresponding to each of the demagnetized regions along the slurry flow direction according to the electrical signal obtained by detecting the magnetism of the slurry in each of the demagnetized regions so that the slurry magnetism in each of the demagnetized regions is maintained within the corresponding preset range.

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