Turbulent flow stirring demagnetization device and control method

Abstract

The present application relates to a turbulent stirring demagnetization device and a control method. The turbulent stirring demagnetization device includes: a control terminal, a magnetic monitor, a turbulent stirring device, a barrel, and an excitation coil. The barrel is provided with a slurry inlet and a slurry outlet. The turbulent stirring device and the excitation coil are provided in the barrel. The magnetic monitor is located at the slurry outlet. The control terminal is connected to the magnetic monitor, the turbulent stirring device, and the excitation coil. The control terminal is used to output an excitation current to excite the excitation coil, generate a periodic oscillating attenuated magnetic field, and control the turbulent stirring device to generate an irregular turbulent flow field inside the barrel. After the slurry enters the barrel through the slurry inlet for demagnetization, it flows out from the slurry outlet. The magnetic monitor is used to perform magnetic detection of the discharged material and feed 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 slurry magnetism within a preset range, thereby improving the demagnetization effect.

Description

Technical Field

[0001] The present application relates to the technical field of mineral processing and demagnetization, and in particular to a turbulent stirring demagnetization device and a control method thereof. Background Art

[0002] During magnetic separation, strongly magnetic minerals like magnetite not only become magnetized but also form agglomerates. After leaving the magnetic field, some of these agglomerates remain in agglomerate form. This agglomeration not only reduces the efficiency of subsequent grading and screening operations but also causes gangue minerals to become encapsulated within the agglomerates, impacting the production performance of the magnetic separation process. Applying a reverse magnetic field to the agglomerates can remove most of the residual magnetism of the magnetite. This process is called demagnetization.

[0003] Traditional demagnetizers utilize a tubular, straight-through demagnetizer. These utilize a conductive coil wrapped around the outer tube wall and, through the application of a voltage and current regulator, generate a continuously changing magnetic field based on the principle of electromagnetic induction. As the slurry flows through the tubular, straight-through demagnetizer, the demagnetizing magnetic field reduces the slurry's residual magnetism, achieving demagnetization. However, since different slurry flow rates experience varying effects in the demagnetizer's magnetic field, the demagnetization effect of tubular, straight-through demagnetizers can be poor. Summary of the Invention

[0004] Based on this, it is necessary to provide a turbulent stirring demagnetization device and a control method that can improve the demagnetization effect in order to address the above problems.

[0005] A turbulent stirring demagnetization device, comprising: a control end, a magnetic monitor, a turbulent stirring device, a barrel, and an excitation coil, wherein the barrel is provided with a slurry inlet and a slurry outlet, the turbulent stirring device and the excitation coil are arranged in the barrel, the magnetic monitor is located at the slurry outlet, and the control end is connected to the magnetic monitor, the turbulent stirring device, and the excitation coil;

[0006] The control end is used to output an excitation current to excite the excitation coil, generate a periodic oscillating attenuated magnetic field, and control the turbulent stirring device to generate an irregular turbulent flow field inside the barrel body; the slurry enters the barrel body through the slurry inlet for demagnetization, and then flows out from the slurry outlet; the magnetic monitor is used to perform magnetic detection of the discharge material and feed back an electrical signal to the control end, and the control end also adjusts the output excitation current according to the electrical signal to maintain the magnetic properties of the slurry within a preset range.

[0007] In one embodiment, the control end is further used to adjust the stirring gear of the turbulent stirring device according to the excitation current.

[0008] In one embodiment, the control end detects the ratio of the real-time value of the excitation current to the average value. If the ratio is less than or equal to a first threshold value, the turbulent stirring device is adjusted to weak stirring; if the ratio is greater than the first threshold value and less than a second threshold value, the turbulent stirring device is adjusted to moderate stirring; if the ratio is greater than or equal to the second threshold value, the turbulent stirring device is adjusted to strong stirring; wherein, the first threshold value is less than the second threshold value.

[0009] In one embodiment, the excitation coil is spirally wound on the outside of the barrel, and / or the distance between two adjacent coils of the excitation coil is 1 / 5 to 1 / 8 of the diameter of the barrel.

[0010] In one embodiment, the turbulent stirring device includes a speed motor and a stirring rod, the stirring rod is arranged in the barrel body, and the speed motor is connected to the control end and the stirring rod.

[0011] In one embodiment, the stirring rod includes a rod body and a hard paddle fixed to the rod body, and the rod body is connected to the speed motor.

[0012] In one embodiment, the control end includes a computer and an excitation control cabinet, the computer is connected to the magnetic monitor through a magnetic monitoring wire, and is connected to the turbulent stirring device through a speed transmission control wire, the excitation control cabinet is connected to the computer, and the excitation control cabinet is connected to the excitation coil through an excitation connection line.

[0013] A turbulent stirring demagnetization control method is implemented based on the above-mentioned turbulent stirring demagnetization device, and the method includes:

[0014] Receive the electrical signal fed back by the magnetic monitor; the electrical signal is obtained by the magnetic monitor performing magnetic detection on the discharge material when the slurry enters the barrel through the slurry inlet for demagnetization and then flows out from the slurry outlet;

[0015] The excitation current output to the excitation coil is adjusted according to the electrical signal to maintain the magnetic properties of the slurry within a preset range; the excitation current is used to excite the excitation coil to generate a periodic oscillating attenuated magnetic field; the turbulent stirring device generates an irregular turbulent flow field inside the barrel.

[0016] In one embodiment, the method further includes: adjusting a stirring gear of the turbulent stirring device according to the excitation current.

[0017] In one embodiment, adjusting the stirring gear of the turbulent stirring device according to the excitation current includes: detecting the ratio of the real-time value of the excitation current to the average value; if the ratio is less than or equal to a first threshold, adjusting the turbulent stirring device to weak stirring; if the ratio is greater than the first threshold and less than a second threshold, adjusting the turbulent stirring device to moderate stirring; if the ratio is greater than or equal to the second threshold, adjusting the turbulent stirring device to strong stirring; wherein, the first threshold is less than the second threshold.

[0018] In the above-mentioned turbulent stirring demagnetization device and control method, the control end outputs an excitation current to excite the excitation coil, generating a periodic oscillating attenuated magnetic field, and controls the turbulent stirring device to generate an irregular turbulent flow field inside the barrel. The slurry enters the barrel through the slurry inlet for demagnetization and flows out from the slurry outlet. The magnetic monitor performs discharge magnetic detection and feeds back an electrical signal to the control end. The control end also adjusts the output excitation current according to the electrical signal to maintain the slurry magnetism within a preset range. By forming a periodic oscillating attenuated magnetic field with controllable intensity and an irregular turbulent demagnetization area, efficient demagnetization of the slurry can be achieved. Combined with the discharge magnetic feedback adjustment control, it can well adapt to the magnetic difference fluctuations of the material and improve the demagnetization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a turbulent stirring demagnetization device in one embodiment;

[0020] Figure 2 This is a schematic diagram of the front view of the barrel of a turbulent stirring demagnetization device in one embodiment;

[0021] Figure 3 A schematic diagram of a top view of a barrel of a turbulent stirring demagnetization device according to one embodiment;

[0022] Figure 4 Schematic diagram of a flow chart of a turbulent stirring demagnetization control method according to one embodiment;

[0023] Figure 5 A schematic diagram of a demagnetization effect monitoring and feedback adjustment process in one embodiment;

[0024] Figure 6 A schematic diagram of periodically decaying excitation current and magnetic field in one embodiment;

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

[0026] Figure 8 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment.

[0027] Explanation of the accompanying symbols: 1. Computer; 2. Excitation control cabinet; 3. Excitation connection line; 4. Magnetic monitoring wire; 5. Magnetic monitor; 6. Speed transmission control wire; 7. Speed motor; 8. Stirring rod; 9. Barrel body; 10. Slurry outlet; 11. Excitation coil; 12. Slurry inlet. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0029] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0030] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0031] Iron ore is an important raw material for steel production. Generally, iron ore with a grade below 50% needs to be beneficiated to improve its grade before it can be smelted and used. The technology of using the magnetic differences of different minerals to separate and enrich minerals is called magnetic separation. Magnetic separation is the most widely used technology for separating magnetic iron ore. In magnetic separation, the material has a higher magnetic susceptibility than the magnetic susceptibility of the material. χ >4.0×10 -5 m 3 / kg minerals are called strong magnetic minerals. When the magnetic separation intensity is (0.8~1.36)×10 5 A / m weak magnetic field magnetic separator can be recovered, such minerals mainly include magnetite, hematite, titanomagnetite, pyrrhotite and zinc-iron spinel.

[0032] During magnetic separation in a magnetic field, strongly magnetic minerals such as magnetite not only become magnetized but also form agglomerates. After leaving the magnetic field, some of these agglomerates remain in agglomerate form. This magnetic agglomeration not only reduces the efficiency of subsequent grading and screening operations but also causes gangue minerals to be encapsulated within the magnetic agglomerates, affecting the production performance of the magnetic separation process. Applying a reverse magnetic field to the magnetic agglomerates can remove most of the residual magnetism of the magnetite. This process is called demagnetization (or demagnetization). Depending on the magnetic field excitation principle and characteristics of the demagnetizer, the output power can vary greatly, such as harmonic wave mode, pulse mode, and so on. However, actual mining operations have found that the application of demagnetizers in mineral processing plants is limited, and some of the results are unsatisfactory.

[0033] At present, the mainstream demagnetizer adopts a tubular straight-through demagnetizer, which forms a continuously changing magnetic field based on the principle of electromagnetic induction by winding a conductive coil on the outer tube wall and applying a voltage and current regulating device. When the slurry flows through the tubular straight-through demagnetizer, the demagnetization magnetic field reduces the remanence of the slurry, thereby achieving the purpose of demagnetization. However, according to fluid mechanics theory and Stokes equation calculations, the flow velocity on the water section flowing through the middle layer of the circular tube is parabolically distributed, and the flow velocity of the slurry is non-uniform. Slurries with different flow rates have different effects under the action of the magnetic field formed by the demagnetizer, resulting in the general demagnetization effect of the tubular straight-through demagnetizer. Based on this, the present application provides a turbulent stirring demagnetization device and control method, which can achieve efficient demagnetization of the slurry by forming a periodic oscillating attenuation magnetic field with controllable intensity and an irregular turbulent demagnetization area. In addition, the discharge magnetic feedback regulation control system is equipped, and the demagnetization magnetic field excitation current and turbulent stirring intensity are coupled, which can well adapt to the fluctuation of material magnetic differences.

[0034] In one embodiment, Figure 1 As shown, a turbulent stirring demagnetization device is provided, comprising: a control end, a magnetic monitor 5, a turbulent stirring device, a barrel body 9 and an excitation coil 11. The barrel body 9 is provided with a slurry inlet 12 and a slurry outlet 10. The turbulent stirring device and the excitation coil 11 are provided in the barrel body 9. The magnetic monitor 5 is located at the slurry outlet 10. The control end is connected to the magnetic monitor 5, the turbulent stirring device and the excitation coil 11. The control end is used to output an excitation current to excite the excitation coil 11, generate a periodic oscillating attenuated magnetic field, and control the turbulent stirring device to generate an irregular turbulent flow field inside the barrel body 9; after the slurry enters the barrel body 9 through the slurry inlet 12 for demagnetization, it flows out from the slurry outlet 10; the magnetic monitor 5 is used to perform magnetic detection of the discharged material and feed back an electrical signal to the control end. The control end also adjusts the output excitation current according to the electrical signal to maintain the magnetic properties of the slurry within a preset range.

[0035] Specifically, the barrel body 9 can be arranged vertically, the slurry inlet 12 is located at the bottom of the barrel body 9, and the slurry outlet 10 is located at the top of the barrel body 9. The slurry flows from bottom to top in a surging manner through the periodic oscillating attenuated magnetic field, and is demagnetized while being turbulently stirred. The specific structure of the control end is not unique, and may include one or more controllers. In one embodiment, the control end includes a computer 1 and an excitation control cabinet 2, and the computer 1 is connected to the magnetic monitor 5 through the magnetic monitoring wire 4, and is connected to the turbulent stirring device through the speed transmission control wire 6. The excitation control cabinet 2 is connected to the computer 1, and the excitation control cabinet 2 is connected to the excitation coil 11 through the excitation connection 3. The computer 1 receives the electrical signal fed back by the magnetic monitor 5, generates a controllable current through the excitation control cabinet 2, and inputs it to the excitation coil 11 with the help of the excitation connection 3 connected to the excitation control cabinet 2, thereby generating a periodic oscillation attenuated magnetic field. The periodic oscillation attenuated magnetic field is determined by the current value It, the attenuation period t and the periodic oscillation frequency. For slurries primarily composed of natural magnetite, the demagnetization magnetic field strength is maintained above 48 kA / m by adjusting the excitation current. Specifically, 50 Hz AC current can be used to ensure that the magnetic field repeatedly changes at least 12 times within a cycle. The controllable current generated by the excitation control cabinet 2 can be an oscillating damping current, which is input to the excitation coil 11 via the excitation connection 3. In other embodiments, the oscillating damping current can be replaced by a reciprocating oscillating current.

[0036] Furthermore, the upper limit and lower limit values of the preset range are not unique. In one embodiment, the preset range can be determined based on the magnetic threshold B0 and the allowable error margin. It can be understood that the specific values of the magnetic threshold B0 and the error margin can be set according to actual needs. In this embodiment, the error margin is 0.1 times the magnetic threshold B0, and the preset range is 0.9 times the magnetic threshold B0-1.1 times the magnetic threshold B0. The computer 1 can determine the slurry magnetic properties Bt based on the electrical signal fed back by the magnetic monitor 5. If the slurry magnetic properties 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 properties meet the requirements and the slurry demagnetization and discharge are completed; if the slurry magnetic properties Bt is greater than 1.1 times the magnetic threshold B0, the current value It is increased; if the slurry magnetic properties Bt is less than 0.9 times the magnetic threshold B0, the current value It is reduced.

[0037] In one embodiment, the control terminal is further configured to adjust the stirring level of the turbulent stirring device based on the excitation current. Specifically, the stirring level of the turbulent stirring device can be adjusted based on the excitation current generated by the excitation control cabinet 2 via program instructions from the computer 1, thereby generating a random turbulent flow field. By coupling the demagnetization field excitation current and the turbulent stirring intensity, the device can better adapt to fluctuations in material magnetic properties.

[0038] In one embodiment, the control end detects the ratio of the real-time value of the excitation current to the average value. If the ratio is less than or equal to a first threshold value, the turbulent stirring device is adjusted to weak stirring; if the ratio is greater than the first threshold value and less than a second threshold value, the turbulent stirring device is adjusted to moderate stirring; if the ratio is greater than or equal to the second threshold value, the turbulent stirring device is adjusted to strong stirring.

[0039] Wherein, the first threshold value is less than the second threshold value. The values of the first threshold value and the second threshold value are not unique and can be set according to actual needs. In the present embodiment, the first threshold value is 0.8 and the second threshold value is 1.2. Specifically, the stirring gear of the turbulent stirring device can be divided into weak stirring (speed range 200-400rpm), moderate stirring (speed range 400-600rpm) and strong stirring (speed range 600-1000rpm) according to the different stirring speeds. When the turbulent stirring demagnetization device is just started, the turbulent stirring device can be controlled to perform moderate stirring, and then the real-time size of the excitation current and the average value within the set time period are recorded, and the ratio K of the real-time value of the excitation current to the average value is calculated. If K is less than or equal to 0.8, the turbulent stirring device is adjusted to weak stirring; if the ratio K is greater than 0.8 and less than 1.2, the turbulent stirring device is adjusted to moderate stirring; if the ratio K is greater than or equal to 1.2, the turbulent stirring device is adjusted to strong stirring. It can be understood that in this embodiment, the stirring gears of the turbulent stirring device are divided into three gears: weak stirring, medium stirring and strong stirring. In other embodiments, the stirring gears of the turbulent stirring device can also be divided into other levels of gears, which can be set according to actual needs.

[0040] The specific structure of the turbulent stirring device is not unique. In one embodiment, Figure 1 As shown, the turbulent stirring device includes a speed motor 7 and a stirring rod 8. The stirring rod 8 is arranged in a barrel 9. The speed motor 7 is connected to the control end and the stirring rod 8. Specifically, the computer 1 is connected to the speed motor 7 through the speed transmission control wire 6, thereby controlling the rotation of the stirring rod 8. In addition, as Figure 2 and Figure 3 As shown, in this embodiment, the stirring rod 8 includes a rod body and a hard paddle fixed to the rod body, and the rod body is connected to the speed motor 7. The hard paddle can be arranged perpendicular to the rod body or inclined to the rod body. Alternatively, some hard paddles can be arranged perpendicular to the rod body, while others can be arranged inclined to the rod body. By installing hard paddles on the rod body, the stirring effect can be enhanced. It is understood that in other embodiments, the turbulent stirring device can be replaced with other devices with the same function.

[0041] The specific arrangement of the excitation coil 11 is not unique; the excitation coil 11 can be arranged inside or outside the barrel 9. In one embodiment, the excitation coil 11 is spirally wound around the outside of the barrel 9, specifically before the slurry inlet 12 and the slurry outlet 10, to demagnetize the slurry in the barrel 9. Furthermore, the distance between two adjacent coils of the excitation coil 11 is 1 / 5 to 1 / 8 of the diameter of the barrel 9 to ensure magnetic field strength and demagnetization effect.

[0042] The above-mentioned turbulent stirring demagnetization device can achieve efficient demagnetization of the slurry by forming a periodic oscillating attenuation magnetic field with controllable intensity and an irregular turbulent demagnetization area. Combined with the discharge magnetic feedback adjustment control, it can adapt well to the fluctuation of the material magnetic difference and improve the demagnetization effect.

[0043] In one embodiment, a turbulent stirring demagnetization control method is also provided, which is implemented based on the above-mentioned turbulent stirring demagnetization device, such as Figure 4 As shown, the method includes:

[0044] Step S110: Receive the electrical signal fed back by the magnetic monitor. The electrical signal is obtained when the slurry enters the barrel through the slurry inlet for demagnetization and flows out of the slurry outlet, and the magnetic monitor performs magnetic detection on the discharge.

[0045] Step S120: Adjust the excitation current output to the excitation coil based on the electrical signal to maintain the slurry's magnetic properties within a preset range. The excitation current is used to excite the excitation coil, generating a periodic oscillating attenuated magnetic field; the turbulent agitation device generates a random turbulent flow field within the barrel.

[0046] In one embodiment, the method further includes step S130: adjusting the stirring gear of the turbulent stirring device according to the excitation current.

[0047] In one embodiment, step S130 includes: detecting the ratio of the real-time value of the excitation current to the average value; if the ratio is less than or equal to a first threshold, adjusting the turbulent stirring device to weak stirring; if the ratio is greater than the first threshold and less than a second threshold, adjusting the turbulent stirring device to moderate stirring; if the ratio is greater than or equal to the second threshold, adjusting the turbulent stirring device to strong stirring; wherein the first threshold is less than the second threshold.

[0048] It can be understood that the specific implementation of the above-mentioned turbulent stirring demagnetization control method has been explained in detail in the above-mentioned turbulent stirring demagnetization device, and will not be repeated here.

[0049] In order to facilitate a better understanding of the above-mentioned turbulent stirring demagnetization device and control method, a detailed explanation is given below in conjunction with specific embodiments.

[0050] like Figure 1As shown, the turbulent stirring demagnetization device includes a computer 1, an excitation control cabinet 2, an excitation connection line 3, a magnetic monitoring wire 4, a magnetic monitor 5, a speed transmission control wire 6, a speed motor 7, a stirring rod 8, a barrel 9, a slurry outlet 10, an excitation coil 11 and a slurry inlet 12.

[0051] Reference Figure 1 The computer 1 is connected to the excitation control cabinet 2 to form an integrated control end, which receives the signal fed back by the magnetic monitor 5. Through the program instructions of the computer 1, the excitation control cabinet 2 generates a controllable current, which is input to the excitation coil 11 with the help of the excitation connection line 3 connected to the excitation control cabinet 2 to generate a controllable magnetic field.

[0052] Reference Figure 1 The computer 1 is connected to the excitation control cabinet 2 to form an integrated control end, which receives the signal fed back by the magnetic monitor 5, couples the excitation current generated by the excitation control cabinet 2 through the program instructions of the computer 1, adjusts the stirring speed of the speed motor 7, and generates an irregular turbulent flow field.

[0053] Reference Figure 1 The excitation coil 11 is spirally wound on the outside of the barrel 9 , with the distance between two adjacent coils being 1 / 5-1 / 8 of the barrel diameter, and the winding range is between the slurry inlet 12 and the slurry outlet 10 .

[0054] Reference Figure 1 The slurry outlet 10 is connected to the magnetic monitor 5 to monitor the magnetism of the discharged material and feed it back to the computer 1 through the magnetic monitoring wire 4.

[0055] Reference Figures 1 to 3 The computer 1 is connected to the speed motor 7 through the speed transmission control wire 6, thereby controlling the rotation of the stirring rod 8. The stirring rod 8 is located inside the barrel and has a hard paddle that enhances the stirring effect.

[0056] like Figure 5 As shown, the monitoring, feedback, and regulation process for the turbulent agitation demagnetization device is as follows: Slurry is continuously fed into the demagnetization barrel 9, where it is excited and stirred by controlling the current to create a turbulent demagnetization environment. The discharge magnetic field (Bt) is then tested. If the slurry magnetic field (Bt) is between 0.9 and 1.1 times the magnetic threshold (B0), the slurry is demagnetized and discharged. If the slurry magnetic field (Bt) is greater than 1.1 times the magnetic threshold (B0), the current value (It) is increased by the previous control level. If the slurry magnetic field (Bt) is less than 0.9 times the magnetic threshold (B0), the current value (It) is decreased by the previous control level.

[0057] Reference Figure 2 、 Figure 3 and Figure 5, the turbulence intensity formed by stirring is controlled by the stirring speed, which is divided into weak stirring (speed range 200 - 400 rpm), medium stirring (speed range 400 - 600 rpm), and strong stirring (speed range 600 - 1000 rpm).

[0058] Refer to Figure 5 , the stirring speed is determined according to the ratio K of the real-time value to the average value of the exciting current. If K ≤ ≤ 0.8, weak stirring is enabled; if 0.8 < K < 1.2, medium stirring is enabled; if K ≥ 1.2, strong stirring is enabled.

[0059] Refer to Figure 6 , the periodically oscillating decaying magnetic field is determined by the current value It, the decay period t, and the periodic oscillation frequency. For the slurry mainly composed of natural magnetite, the exciting current value should ensure that the demagnetizing magnetic field strength is above 48 kA / m. Using alternating current with a frequency of 50 Hz, the magnetic field should change repeatedly more than 12 times within one period.

[0060] The demagnetization working process is described as follows:

[0061] Step 1, the computer 1 and the exciting current control cabinet 2 generate and control the exciting current to excite the exciting coil 11, generating a periodically oscillating decaying magnetic field.

[0062] Step 2, the stirring rod 8 performs medium stirring under the drive of the stirring motor 7, with a stirring speed of 400 - 600 rpm.

[0063] Step 3, the slurry with a mass concentration of 30% - 40% is fed into the barrel body 9 through the slurry inlet 12. The slurry passes through the periodically oscillating decaying magnetic field from bottom to top in a gushing manner, and is demagnetized while being turbulently stirred. The time for the slurry to enter and leave the barrel body 9 for demagnetization should be greater than 0.24 s.

[0064] Step 4, the stirring speed is automatically coupled with the fast and slow according to the magnitude of the ratio K of the real-time value to the average value of the exciting current. If K ≤ 0.8, weak stirring is enabled; if 0.8 < K < 1.2, medium stirring is enabled; if K ≥ 1.2, strong stirring is enabled.

[0065] Step 5, the demagnetized slurry is discharged through the slurry outlet 10, and is detected by the magnetic force monitor 5 for the discharge magnetism Bt during the discharge process, and an electrical signal is fed back to the computer 1. If the slurry magnetism Bt is between 0.9 - 1.1 times the magnetic threshold B0, the slurry demagnetization discharge is completed; if the slurry magnetism Bt is greater than 1.1 times the magnetic threshold B0, the previous-level control is fed back to increase the current value It; if the slurry magnetism Bt is less than 0.9 times the magnetic threshold B0, the previous-level control is fed back to decrease the current value It.

[0066] In response to the technical problems of poor demagnetization effect and lack of feedback correction control method for demagnetization effect in the tubular straight-through demagnetizer equipment currently used in mineral processing plants, this application proposes a turbulent stirring demagnetization device and control method, which introduces a turbulent demagnetization function in the process of electromagnetic induction demagnetization of slurry, couples the demagnetization current and turbulent stirring intensity, and forms a closed-loop control with the demagnetization effect evaluation. The periodic oscillation attenuation magnetic field generated by the excitation current is suitable for slurries with different magnetic properties and can be controlled by the current value It, the current period t and the periodic oscillation frequency. By utilizing the periodic oscillation attenuation current, the turbulent strong dispersion and the demagnetization feedback coupling adjustment method, a periodic oscillation attenuation magnetic field with controllable intensity and an irregular turbulent demagnetization area can be formed, which can achieve efficient demagnetization of the slurry; in addition, the discharge magnetic feedback adjustment control system is equipped to couple the demagnetization magnetic field excitation current and the turbulent stirring intensity, which can well adapt to the fluctuation of material magnetic differences.

[0067] Based on the same inventive concept, embodiments of the present application also provide a turbulent agitation demagnetization control device for implementing the aforementioned turbulent agitation demagnetization control method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more turbulent agitation demagnetization control device embodiments provided below can be found in the limitations of the turbulent agitation demagnetization control method described above and will not be repeated here.

[0068] In one embodiment, Figure 7 As shown, a turbulent stirring demagnetization control device is provided, which is implemented based on the above-mentioned turbulent stirring demagnetization device and includes:

[0069] The signal receiving module 110 is used to receive the electrical signal fed back by the magnetic monitor. The electrical signal is obtained by the magnetic monitor performing magnetic detection on the slurry when the slurry enters the barrel through the slurry inlet for demagnetization and then flows out of the slurry outlet.

[0070] The current regulation module 120 is used to adjust the excitation current output to the excitation coil based on the electrical signal to maintain the slurry's magnetic properties within a preset range. The excitation current is used to excite the excitation coil, generating a periodically oscillating, attenuated magnetic field. The turbulent agitation device generates a random turbulent flow field within the barrel.

[0071] In one embodiment, the device further includes a stirring adjustment module 130 for adjusting the stirring gear of the turbulent stirring device according to the excitation current.

[0072] In one embodiment, the stirring adjustment module 130 detects the ratio of the real-time value of the excitation current to the average value. If the ratio is less than or equal to a first threshold value, the turbulent stirring device is adjusted to weak stirring; if the ratio is greater than the first threshold value and less than a second threshold value, the turbulent stirring device is adjusted to moderate stirring; if the ratio is greater than or equal to the second threshold value, the turbulent stirring device is adjusted to strong stirring; wherein the first threshold value is less than the second threshold value.

[0073] Each module in the turbulent agitation demagnetization control device can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0074] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 8 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a turbulent stirring demagnetization control method is implemented.

[0075] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0076] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method are implemented.

[0077] In one embodiment, a computer program product is provided, comprising a computer program, which implements the steps of the above method when executed by a processor.

[0078] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may 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 may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0079] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0080] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A turbulent stirring demagnetization device, characterized in that: include: A control end, a magnetic monitor, a turbulent stirring device, a barrel and an excitation coil, wherein the barrel is provided with a slurry inlet and a slurry outlet, the turbulent stirring device and the excitation coil are provided in the barrel, the magnetic monitor is located at the slurry outlet, and the control end is connected to the magnetic monitor, the turbulent stirring device and the excitation coil; The control end is used to output an excitation current to excite the excitation coil, generate a periodic oscillating attenuated magnetic field, and control the turbulent stirring device to generate an irregular turbulent flow field inside the barrel body; the slurry enters the barrel body through the slurry inlet for demagnetization and then flows out from the slurry outlet; the magnetic monitor is used to perform magnetic detection of the discharged material and feed back an electrical signal to the control end, and the control end also adjusts the output excitation current according to the electrical signal to maintain the magnetic properties of the slurry within a preset range; The control end is also used to adjust the stirring gear of the turbulent stirring device according to the excitation current. The control end detects the ratio of the real-time value of the excitation current to the average value. If the ratio is less than or equal to a first threshold, the turbulent stirring device is adjusted to weak stirring; if the ratio is greater than the first threshold and less than a second threshold, the turbulent stirring device is adjusted to moderate stirring; if the ratio is greater than or equal to the second threshold, the turbulent stirring device is adjusted to strong stirring; wherein, the first threshold is less than the second threshold.

2. The turbulent stirring demagnetization device according to claim 1, characterized in that: The preset range is 0.9 times the magnetic threshold value to 1.1 times the magnetic threshold value.

3. The turbulent stirring demagnetization device according to claim 2, characterized in that: The first threshold value is 0.8, the second threshold value is 1.2; the rotation speed range of the weak stirring is 200-400 rpm, the rotation speed range of the moderate stirring is 400-600 rpm, and the rotation speed range of the strong stirring is 600-1000 rpm.

4. The turbulent stirring demagnetization device according to claim 1, characterized in that: The excitation coil is spirally wound on the outer side of the barrel, and / or the distance between two adjacent coils of the excitation coil is 1 / 5 to 1 / 8 of the diameter of the barrel.

5. The turbulent stirring demagnetization device according to claim 1, characterized in that: The turbulent stirring device includes a speed motor and a stirring rod. The stirring rod is arranged in the barrel body. The speed motor is connected to the control end and the stirring rod.

6. The turbulent stirring demagnetization device according to claim 5, characterized in that: The stirring rod comprises a rod body and a hard paddle fixed to the rod body, and the rod body is connected to the speed motor.

7. The turbulent stirring demagnetization device according to any one of claims 1 to 6, characterized in that: The control end includes a computer and an excitation control cabinet. The computer is connected to the magnetic monitor through a magnetic monitoring wire, and is connected to the turbulent stirring device through a speed transmission control wire. The excitation control cabinet is connected to the computer, and the excitation control cabinet is connected to the excitation coil through an excitation connection line.

8. A turbulent stirring demagnetization control method, characterized in that: The method is implemented based on the turbulent stirring demagnetization device according to any one of claims 1 to 7, comprising: Receive the electrical signal fed back by the magnetic monitor; the electrical signal is obtained when the slurry enters the barrel through the slurry inlet for demagnetization and then flows out of the slurry outlet, and the magnetic monitor performs discharge magnetic detection; The excitation current output to the excitation coil is adjusted according to the electrical signal to maintain the magnetic properties of the slurry within a preset range; the excitation current is used to excite the excitation coil to generate a periodic oscillating attenuated magnetic field; the turbulent stirring device generates a random turbulent flow field inside the barrel; The method also includes: detecting the ratio of the real-time value to the average value of the excitation current; if the ratio is less than or equal to a first threshold, adjusting the turbulent stirring device to weak stirring; if the ratio is greater than the first threshold and less than a second threshold, adjusting the turbulent stirring device to moderate stirring; if the ratio is greater than or equal to the second threshold, adjusting the turbulent stirring device to strong stirring; wherein, the first threshold is less than the second threshold.

9. The turbulent stirring demagnetization control method according to claim 8, characterized in that: The preset range is 0.9 times the magnetic threshold value to 1.1 times the magnetic threshold value.

10. The turbulent stirring demagnetization control method according to claim 9, characterized in that: The first threshold value is 0.8, the second threshold value is 1.2; the rotation speed range of the weak stirring is 200-400 rpm, the rotation speed range of the moderate stirring is 400-600 rpm, and the rotation speed range of the strong stirring is 600-1000 rpm.

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