Test method for operating parameters of elutriation magnetic separation device

Abstract

The present invention discloses a test method for the operating parameters of an elutriation magnetic separation device, comprising the following steps: step A, preparation of ore pulp: putting a sample into a container and adding water, adding the prepared ore pulp into the elutriation magnetic separation device after stirring, or directly putting the sample into the elutriation magnetic separation device and adding water and stirring; step B, elutriation: setting the magnetic field intensity setting value, elutriation time and water flow rate in the elutriation magnetic separation device, starting to elutriate the ore pulp after power on, collecting tailings ore pulp during the elutriation process, and collecting concentrate ore pulp after reaching the set time. The present invention realizes the timing and quantitative operation of the mineral processing experiment process through one-time feeding, setting water flow rate and magnetic field intensity. During the experiment, tailings, concentrate and water are all recovered, and the full closed-loop operation can accurately calculate the concentrate yield, recovery rate and water consumption, so as to be used for the calibration and optimization of the operating parameters of the elutriation magnetic separator.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic mineral separation equipment, and in particular relates to a test method for operating parameters of an elutriation magnetic separation device. Background Art

[0002] The elutriation magnetic separator is an electromagnetic-gravity separation equipment for highly magnetic minerals. The working principle of the elutriation magnetic separator is: multiple sets of electromagnetic coils are installed on the outside of the separation drum. After power is turned on, a composite magnetic field from top to bottom is generated in the separation drum. The particles are impacted by the rising water added from the bottom, gravity and magnetism. The highly magnetic minerals move to the bottom of the separation drum to form concentrates due to the gravity + magnetism being greater than the impact of water. Non-magnetic materials, weakly magnetic minerals and low-grade conjoined bodies move along the water flow direction to the overflow weir to form tailings due to the gravity + magnetism being less than the impact of water during the continuous elutriation process, so as to achieve the purpose of highly efficient separation of highly magnetic minerals.

[0003] In order to determine the operating parameters of the above-mentioned on-site elutriation magnetic separators, the existing laboratory small-scale elutriation magnetic separator test machines are often manufactured by imitating the principles of large-scale elutriation magnetic separators, with continuous feeding of ore, continuous water supply, and continuous output of concentrate during the experiment. Due to the small amount of experimental ore samples, coupled with the fact that the control valves and metering instruments and meters cannot be miniaturized, the experimental results of the small-scale elutriation magnetic separator test machine are not repeatable, and are quite different from the operating results of the large-scale elutriation machine, and the experimental deviation cannot be controlled. In addition, there are too many disturbances that affect the operation of the small-scale elutriation magnetic separator test machine. In order to stabilize the experimental conditions, multiple people need to operate at the same time, and quantitative experiments and calibrations cannot be performed, resulting in the experimental conclusions sometimes losing their guiding significance. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a test method for the operating parameters of a washing and magnetic separation device. The test is carried out by feeding a certain amount of material once, continuously supplying water for a certain period of time and maintaining a magnetic field of a certain intensity to obtain concentrate slurry and tailings slurry, and then the grades of the concentrate and tailings are obtained by drying, weighing and testing. The best separation effect is then confirmed by adjusting the parameters and conducting multiple experiments, so as to calibrate and optimize the operating indicators of large-scale washing machines.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a test method for the operating parameters of an elutriation magnetic separation device, based on an elutriation magnetic separation test system, the elutriation magnetic separation test system includes an elutriation magnetic separation device and a matching controller, the method includes the following steps: step A, preparation of slurry: put the sample into a container and add water, add the prepared slurry into the elutriation magnetic separation device after stirring, or directly put the sample into the elutriation magnetic separation device and add water and stir; step B, elutriation: set the magnetic field strength setting value, elutriation time and water flow rate in the elutriation magnetic separation device, start to elutriate the slurry after power is turned on, collect the tailings slurry with a tailings collection container during the elutriation process, and after the set time is reached, open the bottom valve in the elutriation magnetic separation device and collect the concentrate slurry with a concentrate collection container.

[0006] Furthermore, the particle size of the sample in step A is less than 0.3 mm, and the volume of the prepared slurry is smaller than the volume of the washing drum in the washing magnetic separation device.

[0007] Furthermore, the setting value of the magnetic field in step B includes a fixed magnetic field setting value, a circulating magnetic field setting value and a compensation magnetic field setting value, and the setting range is 800-1300Oe; the setting range of the washing time is 60-300s.

[0008] Furthermore, a water supply regulating valve, a flow meter and a water supply solenoid valve controlled by the PLC controller are provided on the water supply pipeline connected to the washing and magnetic separation device.

[0009] Furthermore, the controller includes a PLC controller arranged in a control cabinet, a control panel and a relay connected to the PLC controller, an input end of the relay is connected to the PLC controller, and an output end is connected to the water supply solenoid valve.

[0010] Furthermore, the washing magnetic separation device includes a test body, a washing drum arranged in the test body, a plurality of excitation coils arranged on the outside of the washing drum, an overflow trough arranged on the top of the washing drum, a tailings pipe connected to the overflow trough, and a flushing pipeline arranged in the test body and connected to the water supply pipeline, the water outlet end of the flushing pipeline is connected to the bottom of the washing drum, and a bottom valve is provided at the discharge port at the conical bottom of the washing drum.

[0011] Furthermore, a feeder is provided on the top of the test machine body, a feeding pipe is provided at the bottom of the feeder, and the bottom of the feeding pipe is located in the washing cylinder.

[0012] Furthermore, an excitation cable plug for connecting to the PLC controller is provided on the test machine body.

[0013] Furthermore, the bottom of the test body is arranged on the base by means of a connecting plate.

[0014] Furthermore, a leveling assembly is provided between the connecting plate and the base, and the leveling assembly includes a leveling nut fixed at a connection of the connecting plate and a leveling bolt threadedly connected to the leveling nut and having a bottom in contact with the base.

[0015] The present invention realizes the timed and quantitative operation of the mineral processing experiment process under the control of the controller by one-time feeding, setting the water flow rate and the magnetic field strength. During the experiment, the tailings, concentrates and water are all recovered, and the full closed-loop operation can accurately calculate the concentrate yield, recovery rate and water consumption for calibration and optimization of the operating parameters of the elutriation magnetic separator. The flow meter, water supply solenoid valve and water supply regulating valve are designed, and under the control of the PLC controller, an intelligent timed and quantitative water supply circuit can be realized to supply water to the elutriation magnetic separator.

[0016] The present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an elutriation magnetic separation test system in a test method for operating parameters of an elutriation magnetic separation device of the present invention;

[0018] Figure 2 It is a schematic diagram of the internal structure of the elutriation magnetic separation device in the test method of the operating parameters of the elutriation magnetic separation device of the present invention.

[0019] In the attached drawings, 1. test machine body, 2. PLC controller, 3. control panel, 4. control cabinet, 5. water supply solenoid valve, 6. flow meter, 7. water supply pipeline, 8. base, 9. relay, 10. excitation cable plug, 11. flushing pipeline, 12. water supply regulating valve, 13. bottom valve, 14. excitation coil, 15. washing cylinder, 16. overflow tank, 17. tailings pipe, 18. feeder, 19. feeding pipe, 20. connecting plate, 21. leveling nut, 22. leveling bolt. DETAILED DESCRIPTION

[0020] See attached Figure 1 and 2 The present invention provides an elutriation magnetic separation test system, which includes an elutriation magnetic separation device and a matching controller.

[0021] A water supply regulating valve 12, a flow meter 6 and a water supply solenoid valve 5 controlled by a PLC controller 2 are provided on the water supply pipeline 7 connected to the washing and magnetic separation device. One end of the water supply regulating valve 12 is connected to the water supply system (such as a municipal water pipeline), and water supply can also be achieved through a water tank, a water pump and a matching water pipe. The water flow rate can be adjusted by manually adjusting the water supply regulating valve 12, and then the water supply is controlled by the water supply solenoid valve 5. The flow meter 6 records the water supply volume, and then the excitation amount of the washing and magnetic separation device during operation is adjusted by the PLC controller 2. The concentrate yield, recovery rate and water consumption can be accurately calculated, and the operating indicators of the large-scale washing machine can be calibrated and optimized.

[0022] The above-mentioned controller is arranged in the control cabinet 4. The control cabinet 4 is provided with a PLC controller 2, a control panel 3 and a relay 9. The control panel 3 adopts a touch screen, through which the current of the excitation coil 14, the washing time and other parameters can be adjusted. The input end of the relay 9 is connected to the PLC controller 2, and the output end is connected to the water supply solenoid valve 5. The PLC controller 2 inputs a pull-in control signal to the relay 9, and then the relay 9 is pulled in, thereby controlling the water supply solenoid valve 5 to open, so that water flows into the washing magnetic separation device.

[0023] See attached Figure 2 The above-mentioned washing and magnetic separation device includes a test body 1, a washing drum 15 arranged in the test body 1, a plurality of excitation coils 14 arranged outside the washing drum 15 and arranged along its axial direction, an overflow trough 16 arranged at the top of the washing drum 15, a tailings pipe 17 connected to the overflow trough 16, and a flushing pipeline 11 arranged in the test body 1 and connected to the water supply pipeline 7, wherein the water outlet end of the flushing pipeline 11 is connected to the bottom of the washing drum 15 and a water outlet hole is provided in the circumferential direction of the water outlet end. A protective shell is provided outside the excitation coil 14. The excitation current passing through the excitation coil 14 can be changed by the PLC controller 2 and the control panel 3, thereby adjusting the strength of the magnetic field generated in the washing drum 15. The test body 1 is made of non-magnetic stainless steel material and has a height of less than 1 meter. An excitation cable plug 10 connected to the PLC controller 2 through a cable is provided on the test body 1. A feeder 18 is provided at the top of the test machine body 1, and a feed pipe 19 is provided at the bottom of the feeder 18. The bottom end of the feed pipe 19 is located in the middle of the washing drum 15. A bottom valve 13 is provided at the discharge port at the conical bottom of the washing drum 15. Different from a complete set of large-scale equipment, in this system, the magnetite sample to be separated is quantitatively fed into the washing drum 15 at one time, and water is continuously supplied at a certain flow rate and for a certain period of time. Under the action of a magnetic field of a certain intensity, impurities are separated from the magnetic concentrate. During the continuous water supply, the bottom valve 13 is closed. After the washing is completed, the bottom valve 13 is opened to obtain the magnetic concentrate.

[0024] The bottom of the test machine body 1 is fixed to the base 8 by means of a connecting plate 20 and matching connecting bolts and connecting nuts. The base 8 is welded by steel pipes, steel plates, etc., and its top plane is a mounting surface, on which mounting holes are provided. In order to ensure that the test machine body 1 is in a vertical state after installation, a leveling assembly is provided between the connecting plate 20 and the base 8. The leveling assembly is provided around the connecting plate 20 and two groups are provided on each side. The leveling assembly includes a leveling nut 21 fixed at the connection of the connecting plate 20 and a leveling bolt 22 threadedly connected to the leveling nut 21 and the bottom of which contacts the top surface of the base 8. A level ruler is provided at the overflow surface of the overflow tank 16. During the connection process between the test body 1 and the base 8, the connection plate 20 and the base 8 are pre-fixed by connecting bolts and nuts, and the distance between the leveling nut 21 and the leveling bolt 22 is adjusted. The level ruler is rotated at multiple angles to ensure the level as much as possible. Then, the water valve is opened to inject water into the device. When the water rises to the overflow surface, the overflow of the overflow surface is observed. The test body 1 is adjusted to make the water overflow evenly by adjusting the distance between the threaded connection of the leveling bolts 22 and the leveling nuts 21 around. After adjustment, the connecting bolts and nuts are finally tightened.

[0025] The system of the present invention is different from the existing industrial washing magnetic separators during the test process. It does not continuously feed ore and continuously discharge concentrates. Instead, a fixed amount of magnetite sample to be separated is added to the feeder 18 at one time. Through timed washing, water supply and magnetic supply, tailings, concentrates and water can be fully recovered during the test process, and a full closed-loop operation can be achieved. Therefore, the concentrate yield, recovery rate and water consumption can be accurately calculated. The specific magnetic field, water volume and time of the washing magnetic separator during operation are determined through experiments. While obtaining the best separation effect, a better balance can be achieved in the magnetic field, water volume and time to reduce costs.

[0026] Based on the above system, the test method of the operating parameters of the washing and magnetic separation device of the present invention includes the following steps.

[0027] Step A, preparation of slurry: put the sample into a container and add water, stir until the particles are fully stirred and there are no compacted solid particles, then add the prepared slurry into the elutriation magnetic separation device through the feeder 18. The particle size of the sample is less than 0.3mm, and the volume of the prepared slurry is less than the volume of the washing drum 15 in the elutriation magnetic separation device to ensure that there is no overflow after adding the slurry. Alternatively, the sample can be directly loaded into the washing drum 15 in the elutriation magnetic separation device and stirred into slurry with water.

[0028] Step B, elutriation: Set the magnetic field strength setting value, elutriation time and water flow rate in the elutriation magnetic separation device. The PLC controller 2 controls the water supply solenoid valve 5 through the relay 9 to open the pipeline to supply water to the device. After the elutriation magnetic separation device is powered on, the excitation coil 14 is energized to generate a magnetic field. The device starts to elutriate the slurry. During the elutriation process, the tailings slurry is collected with a tailings collection container. After the set time is reached, the bottom valve 13 in the elutriation magnetic separation device is opened, and the concentrate slurry is collected with a concentrate collection container. The set value of the magnetic field includes a fixed magnetic field set value, a circulating magnetic field set value and a compensation magnetic field set value, and the setting range is 800-1300Oe. The setting range of the elutriation time is 60-300s.

[0029] Step C: process the collected tailings slurry and concentrate slurry respectively (such as drying, weighing and testing) to obtain the concentrate grade and tailings grade. If the concentrate grade is low, in the next test: appropriately reduce the magnetic field strength, appropriately increase the water supply and increase the flushing time; if the tailings grade is high, in the next test: appropriately increase the magnetic field strength, appropriately supply water and reduce the flushing time. Through multiple tests, the best magnetic field strength, water supply and washing time are finally determined. After each test, the equipment needs to be shut down and cleaned before the next test.

[0030] Example: 1000g of domestic iron ore with a grinding fineness of material (-0.075mm, 90%) and a grade of 65.3% was selected, and the sample was placed in a container with a volume of 5000mL, 4500mL of water was added and stirred and allowed to stand for about 5 minutes for use. The fixed magnetic field, circulating magnetic field, and compensation magnetic field were set to 900, 800, and 900 respectively, the washing time value (120s), the water flow rate was 900 l / h, the prepared slurry was poured into the feeder 18, and the machine was turned on for washing for 120s. All tailings slurry and concentrate slurry were recovered. The following experimental data were obtained after filtration, drying, weighing, and testing.

[0031] Dry ore weight g grade% Particle size - 0.075mm % Theoretical yield% Theoretical yield% Give ore sample 999.9 65.30 90 100 100 Concentrate 925.1 69.06 93 92.73 98.71 Tailings 72.6 11.53 58 7.27 1.29

[0032] By adjusting the magnetic field, water supply and washing time and conducting multiple tests, the ideal separation effect is obtained based on the recorded data to determine the operating parameters of the washing equipment when the above-mentioned iron ore is actually applied.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A test method for operating parameters of an elutriation magnetic separation device, based on an elutriation magnetic separation test system, wherein the elutriation magnetic separation test system comprises an elutriation magnetic separation device and a matching controller, characterized in that: The method comprises the following steps: Step A, preparation of slurry: put the sample into a container and add water, stir and then add the prepared slurry into the elutriation and magnetic separation device or directly put the sample into the elutriation and magnetic separation device and add water and stir; Step B, washing: setting a magnetic field strength setting value, washing time and water flow rate in the washing magnetic separation device, and starting to wash the slurry after power is turned on. During the washing process, the bottom valve (13) is closed and the tailings slurry is collected by a tailings collection container. After the set time is reached, the bottom valve (13) in the washing magnetic separation device is opened, and the concentrate slurry is collected by a concentrate collection container; The controller comprises a PLC controller (2) arranged in a control cabinet (4), a control panel (3) connected to the PLC controller (2), and a relay (9), wherein an input end of the relay (9) is connected to the PLC controller (2) and an output end is connected to a water supply solenoid valve (5); A water supply regulating valve (12), a flow meter (6) and a water supply solenoid valve (5) controlled by the PLC controller (2) are provided on a water supply pipeline (7) connected to the elutriation magnetic separation device.

2. The test method for operating parameters of the elutriation magnetic separation device according to claim 1, characterized in that: The particle size of the sample in step A is less than 0.3 mm, and the volume of the prepared slurry is less than the volume of the washing drum (15) in the washing magnetic separation device.

3. The test method for operating parameters of the elutriation magnetic separation device according to claim 1, characterized in that: The setting values ​​of the magnetic field strength in step B include a fixed magnetic field setting value, a circulating magnetic field setting value and a compensation magnetic field setting value, and the setting ranges are all 800-1300 Oe; the setting range of the washing time is 60-300s.

4. The test method for the operating parameters of the elutriation magnetic separation device according to any one of claims 1 to 3, characterized in that: The washing magnetic separation device comprises a test body (1), a washing drum (15) arranged in the test body (1), a plurality of excitation coils (14) arranged outside the washing drum (15), an overflow trough (16) arranged at the top of the washing drum (15), a tailings pipe (17) connected to the overflow trough (16), and a flushing pipeline (11) arranged in the test body (1) and connected to the water supply pipeline (7), wherein the water outlet end of the flushing pipeline (11) is communicated with the bottom of the washing drum (15), and a bottom valve (13) is provided at the discharge port at the conical bottom of the washing drum (15).

5. The test method for operating parameters of an elutriation magnetic separation device according to claim 4, characterized in that: A feeder (18) is provided at the top of the test machine body (1), a feeder pipe (19) is provided at the bottom of the feeder (18), and the bottom of the feeder pipe (19) is located in the washing cylinder (15).

6. The test method for operating parameters of an elutriation magnetic separation device according to claim 4, characterized in that: An excitation cable plug (10) for connecting to the PLC controller (2) is provided on the test machine body (1).

7. The test method for operating parameters of an elutriation magnetic separation device according to claim 4, characterized in that: The bottom of the test machine body (1) is arranged on the base (8) by means of a connecting plate (20).

8. The test method for operating parameters of an elutriation magnetic separation device according to claim 7, characterized in that: A leveling assembly is provided between the connecting plate (20) and the base (8), the leveling assembly comprising a leveling nut (21) fixed at a connection point of the connecting plate (20) and a leveling bolt (22) threadedly connected to the leveling nut (21) and having a bottom in contact with the base (8).

Images