Large electromagnetic elutriation machine

Abstract

The invention discloses a large electromagnetic elutriation machine, which belongs to the technical field of mineral concentration equipment, and comprises a vertically arranged separation cylinder, a plurality of magnet exciting coils are sleeved outside the separation cylinder from top to bottom, and adjacent magnet exciting coils are arranged at intervals; the control system can control all the magnet exciting coils to be powered on and powered off orderly and circularly, within a time period, the magnet exciting coil between every two magnet exciting coils is powered off, the two magnet exciting coils on the two sides of the powered-off magnet exciting coil and adjacent to each other are powered on, and every time period, the magnet exciting coils are powered off. And the next adjacent magnet exciting coil is powered off in the axis direction of the separation cylinder, the two adjacent magnet exciting coils on the two sides of the corresponding powered-off magnet exciting coil are powered on, and the process is repeated till all the magnet exciting coils are powered off. According to the structure, all the magnet exciting coils can be integrally controlled, power on and power off are orderly and circularly carried out, the magnetic attenuation phenomenon occurring when the diameter of the separation cylinder is increased is effectively avoided, and the device is suitable for a large-scale elutriating machine.

Description

Technical Field

[0001] The invention relates to the technical field of mineral concentration equipment, and in particular to a large-scale electromagnetic elutriator. Background Art

[0002] To realize the large-scale washing machine and improve the equipment processing capacity and production efficiency, the diameter of the separation cylinder must be increased. As the diameter of the separation cylinder increases, the magnetic field distribution inside the separation cylinder will change accordingly, and excessive magnetic attenuation will occur around the axis of the separation cylinder, and even magnetic voids will appear. Figure 7 As shown in the figure, this phenomenon will make the magnetic field strength around the axis of the separation drum fail to meet the mineral separation requirements, which will seriously affect the mineral separation, resulting in incomplete mineral separation and greatly reduced processing capacity.

[0003] At present, most electromagnetic washing machines divide the excitation coils into three types according to the mineral processing requirements, namely, the tail control coil, the circulation coil and the compensation coil.

[0004] Among them, the magnetic field generated by the excitation of the tail control coil is mainly used to control the tail, prevent the overflow of magnetic iron and the overflow ratio of the rich-poor intertwined bodies; the magnetic field generated by the excitation of the circulating coil is the sorting magnetic field, which mainly controls the length of the magnetic chain and the downward speed to control the grade of the concentrate; the magnetic field generated by the excitation of the compensation coil mainly forms a uniform downward background magnetic field to prevent the magnetic chain from agglomerating and forming a central "magnetic void". This method of distinguishing the sorting coils and controlling the coils separately is relatively cumbersome and complicated in terms of equipment manufacturing, wiring and control, and also increases the professional skills requirements of the manufacturing, installation and on-site operation personnel.

[0005] In view of the above problems, the present invention designs and manufactures a large-scale electromagnetic washing machine to overcome the above defects. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a large electromagnetic washing machine, which can control all the excitation coils in an integrated manner and cycle power on and off in an orderly manner, thereby effectively solving the magnetic attenuation phenomenon that occurs when the diameter of the sorting drum increases, and is suitable for large-scale washing machines.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows: a large electromagnetic elutriator, comprising a vertically arranged sorting drum, the outer part of which is provided with a plurality of excitation coils from top to bottom, and adjacent excitation coils are arranged at intervals; A control system, wherein the control system can control all the excitation coils to be cyclically powered on and off in an orderly manner. Within a time period, the excitation coil between every two excitation coils is powered off, while the two adjacent excitation coils on both sides of the powered-off excitation coil are energized. After each time period, the next adjacent excitation coil along the axis of the sorting drum is powered off, and the two adjacent excitation coils on both sides of the corresponding powered-off excitation coil are energized, until all the excitation coils are powered off and the cycle repeats again.

[0008] Preferably, an overflow assembly is provided on the top of the separation barrel, a feeding assembly is stacked on the overflow assembly, the lower end of the feeding assembly extends into the separation barrel, and the minerals are scattered into the separation barrel in a high-pressure state through the feeding assembly; The bottom of the separation drum is provided with a concentrate discharge port, and the side of the separation drum is connected with a water inlet pipe.

[0009] Preferably, the overflow assembly is provided with a tailings concentration meter; A concentrate concentration meter is arranged near the concentrate discharge port.

[0010] Preferably, an excitation coil is provided outside the separation drum and below the water inlet pipe; The other excitation coils are arranged above the water inlet pipe.

[0011] Preferably, adjacent excitation coils are spaced apart by a positioning assembly.

[0012] Preferably, the excitation coil is wound by alloy electromagnetic wire.

[0013] Preferably, the number of the excitation coils is at least 5.

[0014] Preferably, the inner diameter of the sorting barrel is not less than 2.2 m.

[0015] Preferably, an outer cylinder is sleeved on the outside of the separation cylinder, and the excitation coil is located between the outer cylinder and the separation cylinder.

[0016] Preferably, the control system is configured as a PLC.

[0017] The invention is beneficial in that: 1. In each time period of the present invention, two adjacent excitation coils on both sides of the de-energized excitation coil are energized, and the magnetic field can be superimposed with the help of the two adjacent energized excitation coils, which effectively improves the magnetic field strength and depth in the sorting drum, reduces the magnetic attenuation phenomenon around the axis of the sorting drum, prevents the occurrence of magnetic voids, ensures that the minerals entering the sorting drum are fully sorted, and makes it possible to scale up the washing machine.

[0018] 2. The present invention no longer divides each excitation coil into a tail control coil, a circulation coil and a compensation coil, but implements an integrated control form for all the excitation coils, which is simple to control, operate and maintain. Moreover, all the excitation coils are circulated on and off in an orderly manner, so that all the excitation coils play the role of controlling the concentrate grade of the traditional circulation coils, increase the number of tumbling times of the mineral in the separation drum, and the "elution" effect is more significant, and the control of the concentrate grade is more accurate.

[0019] 3. In each control cycle, the two excitation coils at the top of the sorting drum will be in a cyclic on-off state. Therefore, the two excitation coils at the top play the role of sorting and selecting minerals as traditional circulating coils. Moreover, since the two excitation coils at the top have no power-off gap, they also play the role of pulsating magnetic field tail control, and also play a buffering and stabilizing role on overflow, thereby maintaining the stability of the liquid level and eliminating intermittent fluctuations of the liquid level.

[0020] 4. In each control cycle, the time when the excitation coil at the bottom of the sorting drum of the present invention is in the energized state is longer than the time when it is in the de-energized state. Since the excitation coil at the bottom is in the energized state for a longer time, it will play a certain function similar to the "compensation coil" of the traditional washing machine.

[0021] 5. If the two excitation coils at the bottom are viewed as a whole, during the operation of the excitation coils, when one of the two excitation coils at the bottom is powered off, the other will be powered on. Since at least one is always powered on, a "compensation coil" similar to that of a traditional elutriator will appear at the bottom of the electromagnetic elutriator separation drum, which has the effect of preventing "magnetic voids". In other words, the two excitation coils at the bottom, in addition to the functions of selecting and selecting minerals as traditional circulating coils, also have the function of preventing "magnetic voids" of the compensation coils of traditional elutriators.

[0022] 6. In each control cycle, the two excitation coils at the bottom will be energized at the same time for a period of time. The superposition of the magnetic fields generated by the two excitation coils further enhances the effect of preventing the occurrence of the "magnetic void" phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a large electromagnetic elutriator; Figure 2 This is a schematic diagram of the magnetic lines of force of two adjacent excitation coils of a large electromagnetic elutriator; Figure 3 It is a schematic diagram of the energization rule of eight excitation coils of the present invention; Figure 4 This is a schematic diagram of the power-on rule of the two top excitation coils of the present invention; Figure 5 This is a schematic diagram of the power-on rule of the bottom excitation coil of the present invention; Figure 6 This is a schematic diagram of the energization rule of the two lower excitation coils of the present invention; Figure 7 Schematic diagram of the magnetic lines of force of a single excitation coil of a large electromagnetic washing machine.

[0024] In the figure: 1. Sorting cylinder; 2. Excitation coil; 3. Outer cylinder; 4. Water inlet pipe; 5. Concentrate discharge port; 6. Feeding assembly; 7. Overflow assembly; 8. Tailings concentration meter; 9. Concentrate concentration meter. DETAILED DESCRIPTION

[0025] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, a large electromagnetic washing machine includes a vertically arranged sorting drum 1, the inner diameter of the sorting drum 1 is not less than 2.2m, a plurality of excitation coils 2 are sleeved from top to bottom on the outside of the sorting drum 1, an outer drum 3 is sleeved on the outside of the sorting drum 1, and the excitation coil 2 is located between the outer drum 3 and the sorting drum 1.

[0027] The excitation coil 2 is wound by alloy electromagnetic wire. Adjacent excitation coils 2 are spaced apart by positioning components. There are at least 5 excitation coils 2. In this embodiment, 8 excitation coils 2 are introduced as an example. The specific excitation coils 2 are set as X1, X2...X7, X8 from top to bottom.

[0028] An overflow assembly 7 is provided on the top of the sorting barrel 1. The overflow assembly 7 is preferably an overflower. A feeding assembly 6 is stacked on the overflow assembly 7. The feeding assembly 6 is preferably a feeding barrel. The lower end of the feeding assembly 6 extends into the sorting barrel 1. The minerals are scattered into the sorting barrel 1 in a high-pressure state through the feeding assembly 6. A concentrate discharge port 5 is provided at the bottom of the sorting barrel 1. The side of the sorting barrel 1 is connected to a water inlet pipe 4. Flushing water enters the sorting barrel 1 through the water inlet pipe 4. The sorted magnetic materials can be discharged from the concentrate discharge port 5 at the bottom of the sorting barrel 1, and the tailings are discharged from the sorting barrel 1 from the overflow assembly 7.

[0029] It also includes a control system, which is preferably set to PLC. The control system can control all the excitation coils 2 to be turned on and off in an orderly manner, so as to form intermittent strong magnetic field areas and weak magnetic field areas in the sorting drum 1. The intermittent strong magnetic field and weak magnetic field respectively produce adsorption and discarding effects on minerals, and repeatedly "wash" the minerals. Under the joint action of flushing water, the magnetic materials agglomerate and disperse in the water, and the non-magnetic impurities wrapped in the minerals are gradually removed to form magnetic agglomerates. In the sinking process of the magnetic agglomerates, they are continuously agglomerated, dispersed, and agglomerated, so that the non-magnetic impurities wrapped inside them become less and less, and finally become concentrate and flow out from the concentrate discharge port 5. The non-magnetic impurities rise and overflow under the action of the rising flushing water flow, thereby realizing the washing of the minerals and completing the mineral processing function.

[0030] To achieve the above function, the following control method is used: within a time period, the excitation coil 2 between every two excitation coils 2 is powered off, while the two adjacent excitation coils 2 on both sides of the powered-off excitation coil 2 are energized; after each time period, the next adjacent excitation coil 2 along the axial direction of the sorting drum 1 is powered off, and the two adjacent excitation coils 2 on both sides of the corresponding powered-off excitation coil 2 are energized, and the cycle repeats again after all the excitation coils 2 are powered off, that is, there is no state where two adjacent excitation coils 2 are powered off at the same time.

[0031] Specifically, the number of the excitation coils 2 is 8, for example. Figure 3 As shown, the power-on and power-off sequence and rules are as follows: During time 1T, the excitation coils X1 and X2 are energized at the same time, the adjacent excitation coil X3 is de-energized, the excitation coils X4 and X5 below them are energized at the same time, the excitation coil X6 is de-energized, and the excitation coils X7 and X8 are energized at the same time. During time 2T, the excitation coil X1 is de-energized, the adjacent excitation coils X2 and X3 are energized, the excitation coil X4 below them is de-energized, the excitation coils X5 and X6 are energized, the excitation coil X7 is de-energized, and the excitation coil X8 is energized. During time 3T, the excitation coil X1 is energized, the excitation coil X2 is de-energized, the excitation coils X3 and X4 are energized, the excitation coil X5 below them is de-energized, the adjacent excitation coils X6 and X7 are energized, and the excitation coil X8 is de-energized. In this way, a complete control cycle is completed, and then this control cycle is repeated.

[0032] In each time period of the present invention, two adjacent excitation coils 2 on both sides of the de-energized excitation coil 2 are energized, and the magnetic field can be superimposed by means of the two adjacent energized excitation coils 2, such as Figure 2 As shown, the magnetic field strength and depth in the separation drum 1 are effectively improved, the magnetic attenuation phenomenon around the axis of the separation drum 1 is reduced, the occurrence of magnetic voids is prevented, and the minerals entering the separation drum 1 are ensured to be fully sorted, making it possible to scale up the washing machine.

[0033] Since each excitation coil 2 is no longer divided into a tail control coil, a circulation coil and a compensation coil, all the excitation coils 2 are controlled in an integrated manner, which is simple to control, operate and maintain. Moreover, all the excitation coils 2 are circulated on and off in an orderly manner, so that all the excitation coils 2 play the role of controlling the concentrate grade of the traditional circulation coils, increase the number of tumbling times of the mineral in the separation drum 1, the "elution" effect is more significant, and the control of the concentrate grade is more accurate.

[0034] Although the present invention does not have a tail control coil, the two excitation coils 2 at the top of the separation cylinder 1 can also play a role in pulsating magnetic field tail control. Figure 4 As shown, in each control cycle, the excitation coils X1 and X2 are in a cyclic on-off state. Since the excitation coils X1 and X2 have no off-off gap, they can play a role in controlling the tail with a pulsating magnetic field. After the magnetic field of the excitation coil X1 adsorbs a certain amount of ferromagnetic minerals, it will be powered off, allowing the ferromagnetic minerals adsorbed on the excitation coil X1 to fall when the magnetic field is weakened. At this time, the size of the ferromagnetic mineral chain on the excitation coil X1 is moderate, which effectively prevents the ferromagnetic minerals from being too large near the excitation coil X1, allowing the ferromagnetic minerals to enter the sorting area for effective sorting, eliminating the phenomenon of running ore, thereby effectively reducing the magnetic iron content of the tailings and reducing the grade of the tailings. The two excitation coils X1 and X2 are regularly cycled on and off, which can well reduce the discharge of magnetic iron in the tailings. It also plays a buffering and stabilizing role in the overflow, thereby being able to keep the liquid level stable and eliminate intermittent fluctuations in the liquid level. In addition, the two excitation coils 2 at the top play the role of sorting and selecting minerals that traditional circulating coils also have.

[0035] Although the present invention does not have a compensation coil, the excitation coil 2 or two adjacent excitation coils 2 at the bottom of the sorting drum 1 have the effect of a traditional compensation coil and can eliminate the "magnetic void" phenomenon at the bottom. Specifically, the excitation coil X8 at the bottom of the sorting drum 1 of the present invention is Figure 5 As shown, the time in the power-on state is longer than the time in the power-off state. Since the bottom excitation coil 2 is in the power-on state for a longer time, it will play a certain function similar to the "compensation coil" of a traditional washing machine.

[0036] If we consider the two excitation coils X7 and X8 at the bottom as a whole, Figure 6As shown, during the operation of the excitation coil 2, at least one of the two excitation coils X7 and X8 at the bottom will always be energized, and a "compensation coil" similar to that of a traditional elutriator will appear at the bottom of the electromagnetic elutriator separation drum 1, which has the effect of preventing "magnetic voids". In other words, the two excitation coils 2 at the bottom, in addition to the functions of selecting and selecting minerals as traditional circulating coils, also have the function of preventing "magnetic voids" of the compensation coils of traditional elutriators.

[0037] In each control cycle, the two excitation coils X7 and X8 at the bottom will be energized at the same time for a period of time. The superposition of the magnetic fields generated by the two excitation coils X7 and X8 further enhances the effect of preventing the occurrence of the "magnetic void" phenomenon.

[0038] The overflow assembly 7 of the present invention is provided with a tailings concentration meter 8, and a concentrate concentration meter 9 is provided near the concentrate discharge port 5. The detection signal of the tailings concentration meter 8 is fed back to the control system, and then compared with the concentration setting value, so as to achieve real-time control of the magnetic field strength of the excitation coil 2; the detection signal of the concentrate concentration meter 9 is fed back to the control system, and then compared with the concentration setting value, so as to achieve real-time control of the concentrate discharge port 5. Finally, in the control system, by setting the target values ​​of the tailings concentration and the concentrate concentration, the control system adopts a PID control algorithm to control the magnetic field force and the opening of the concentrate discharge port 5, so that the target value is maintained within a certain working range.

[0039] An excitation coil 2 is provided outside the separation drum 1 of the present invention and below the water inlet pipe 4 to ensure that the lowest excitation coil 2 can help transport the selected minerals; other excitation coils 2 are arranged above the water inlet pipe 4 to ensure repeated "washing" of the minerals.

[0040] It should be understood that the purpose of these embodiments is only to illustrate the present invention and is not intended to limit the protection scope of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art can make various changes, modifications and / or variations to the present invention, and all of these equivalent forms also fall within the protection scope defined by the claims attached to this application.

Claims

1. A large electromagnetic elutriator, characterized in that: It comprises a vertically arranged sorting cylinder (1), wherein a plurality of excitation coils (2) are sleeved on the outside of the sorting cylinder (1) from top to bottom, and adjacent excitation coils (2) are arranged at intervals; A control system, wherein the control system can control all the excitation coils (2) to be energized in an orderly cycle, wherein within a time period, the excitation coil (2) between every two excitation coils (2) is de-energized, while two adjacent excitation coils (2) on both sides of the de-energized excitation coil (2) are energized, and after each time period, the next adjacent excitation coil (2) along the axis direction of the sorting drum (1) is de-energized, and the two adjacent excitation coils (2) on both sides of the corresponding de-energized excitation coil (2) are energized, and the cycle repeats again until all the excitation coils (2) are de-energized.

2. A large electromagnetic elutriator according to claim 1, characterized in that: An overflow assembly (7) is provided at the top of the separation barrel (1), a feed assembly (6) is stacked on the overflow assembly (7), the lower end of the feed assembly (6) extends into the separation barrel (1), and minerals are scattered into the separation barrel (1) in a high-pressure state through the feed assembly (6); The bottom of the separation drum (1) is provided with a concentrate discharge port (5), and the side of the separation drum (1) is connected to a water inlet pipe (4).

3. A large electromagnetic elutriator according to claim 2, characterized in that: An excitation coil (2) is provided outside the separation drum (1) and below the water inlet pipe (4); The other excitation coils (2) are arranged above the water inlet pipe (4).

4. A large electromagnetic elutriator according to claim 2, characterized in that: The overflow assembly (7) is provided with a tailings concentration meter (8); A concentrate concentration meter (9) is provided near the concentrate discharge port (5).

5. A large electromagnetic elutriator according to claim 1, characterized in that: Adjacent excitation coils (2) are spaced apart by positioning components.

6. A large electromagnetic elutriator according to claim 1, characterized in that: The excitation coil (2) is wound from alloy electromagnetic wire.

7. A large electromagnetic elutriator according to claim 1, characterized in that: The number of the excitation coils (2) is at least five.

8. A large electromagnetic elutriator according to claim 1, characterized in that: The inner diameter of the separation barrel (1) is not less than 2.2 m.

9. A large electromagnetic elutriator according to claim 1, characterized in that: The outer portion of the separation cylinder (1) is provided with an outer cylinder (3), and the excitation coil (2) is located between the outer cylinder (3) and the separation cylinder (1).

10. A large electromagnetic elutriator according to claim 1, characterized in that: The control system is set as PLC.

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