A settling device for ore liquid static separation

Abstract

The present application relates to the technical field of ore powder dissolution precipitation, and particularly relates to a settling device for ore liquid standing separation. The present application comprises a shell and a settling inclined plate, the shell is internally provided with the settling inclined plate, a feeding port is opened at the top of the shell and is connected with a feeding pipe, a discharging port is opened at the bottom of the shell and is connected with a slurry discharge pipe, a magnetic grid plate is arranged directly above the settling inclined plate, a cooling pipe is further arranged in the shell, and an ultrasonic longitudinal wave generator is arranged at the top of the shell. The settling plate can increase the settling area, the magnetic grid plate increases the speed of ore powder particle settling through the magnetic field attraction to metal particles, the magnetic grid plate generates and controls the magnetic field through the energized coil, the cooling pipe is used for cooling the high-temperature ore liquid, slows down the movement of ore powder particles and increases the precipitation rate of ore powder particles, and the ultrasonic longitudinal wave generator improves the mutual coagulation effect of ore powder particles by sending ultrasonic waves to the ore liquid, so as to accelerate the settling speed of the tiny ore powder.

Description

Technical Field

[0001] This invention relates to the technical field of mineral powder leaching and precipitation, and in particular to a sedimentation device for the static separation of mineral liquid. Background Technology

[0002] Monazite is one of the main minerals in rare earth metal ores, often containing minerals such as thorium and zirconium. Its crystals are monoclinic and occur in small, tabular forms. The color is brownish-red, yellow, or yellowish-green, with a greasy or vitreous luster. The fracture is conchoidal and uneven. It is brittle, with a hardness of 5-5.5 and a density of 4.9-5.5 g / cm³. 3 Monazite fluoresces bright green under ultraviolet light. Because it often contains uranium, thorium, and radium, it is radioactive. Monazite is mainly found in pegmatites, granites, and related post-mineral deposits. Associated minerals may include bastnaesite, xenotime, spodumene, zircon, beryl, apatite, rutile, ilmenite, fluorite, barite, or columbite. Due to its relatively stable chemical properties and high density, monazite often forms coastal placer deposits and alluvial placer deposits. Monazite is soluble in sulfuric acid, and when combined with KOH and ammonium molybdate is added, a yellow precipitate of ammonium phosphomolybdate appears.

[0003] Currently, the main process for processing monazite concentrate is concentrated sulfuric acid roasting, supplemented by sodium hydroxide decomposition. The main advantages of concentrated sulfuric acid roasting are low rare earth grade requirements, simple process, short process flow, and ease of large-scale production. Another important smelting process is sodium hydroxide decomposition. This process first requires chemical beneficiation to remove calcium, then water washing and filtration, followed by decomposition with liquid alkali, then water washing to remove soluble salts such as alkali, sodium phosphate, sodium fluoride, and sodium carbonate, and finally hydrochloric acid leaching to obtain rare earth chloride solution. Compared with the acid process, this process is clean, efficient, and allows for comprehensive resource recovery. There is also a third process, the acid-alkali combined method, which first directly leaches mixed rare earth concentrate or bastnaesite with hydrochloric acid, then uses sodium hydroxide to decompose the acid leaching residue with alkali, and finally, after water washing, acid leaching, and neutralization, the resulting neutralized solution is the rare earth chloride solution.

[0004] After acid-base leaching, monazite undergoes neutralization treatment to separate and precipitate the crystals in the leaching solution. Traditional thickeners have a simple structure and rely solely on natural sedimentation to allow the leaching solution to settle. This process is slow and severely affects the efficiency of mineral processing. Furthermore, the natural sedimentation precipitation rate is low, resulting in a large portion of the mineral remaining floating in the leaching solution and being difficult to separate, thus reducing the mineral yield. Summary of the Invention

[0005] In order to improve the speed of mineral liquid separation and sedimentation and increase the yield, the present invention provides a sedimentation device for mineral liquid static separation.

[0006] On the one hand, the sedimentation device for mineral liquid static separation provided by the present invention adopts the following technical solution:

[0007] A settling device for the static separation of slurry includes a shell and a settling inclined plate. The settling inclined plate is disposed inside the shell. The top of the shell has an inlet connected to a feed pipe, and the bottom of the shell has an outlet connected to a slurry discharge pipe. A magnetic grid plate is disposed directly above the settling inclined plate. An energized coil is disposed inside the magnetic grid plate. A cooling pipe is also disposed inside the shell and connected to a heat exchange device. An ultrasonic longitudinal wave generator is disposed on the top of the shell. The ultrasonic longitudinal wave generators are spaced apart from each other and vertically downward.

[0008] By adopting the above technical solutions, the settling plate can increase the settling area and the adhesion area of ​​mineral powder particles, thereby accelerating the settling of mineral powder particles. The magnetic grid plate increases the settling speed of mineral powder particles by attracting metal particles with a magnetic field. The magnetic grid plate generates and controls the generation of a magnetic field through an energized coil. The cooling pipe is used to cool the high-temperature mineral liquid, slow down the movement of mineral powder particles, and increase the precipitation rate of mineral powder particles. The ultrasonic longitudinal wave generator improves the mutual aggregation effect of mineral powder particles by sending ultrasonic waves to the mineral liquid, thereby accelerating the settling speed of small mineral powder particles. At the same time, the longitudinal wave can increase the pressure on the mineral powder particles in the vertical direction, accelerating the settling of mineral powder particles.

[0009] Preferably, the bottom of the shell is inclined towards the middle and a slurry discharge trough is installed at the inclined bottom end. The bottom of the slurry discharge trough is inclined to one side and a slurry discharge pipe is connected to the inclined bottom end. A guide plate is provided at intervals on the upper part of the slurry discharge trough. The guide plate is inclined and the inclination direction is opposite to the inclination direction of the bottom of the slurry discharge trough.

[0010] By adopting the above technical solution, the slurry discharge tank is used to store the mineral powder particles that have settled in the ore liquid, and the guide plate is used to guide the settled mineral powder particles and reduce siltation.

[0011] Preferably, the settling inclined plate is composed of multiple rectangular frames arranged in a multi-square shape, and each rectangular frame is inclined inward and installed near the bottom of the inner side of the shell through a fixed cross plate.

[0012] By adopting the above technical solution, the settling inclined plate is used not only to increase the settling area but also to guide the settled mineral powder particles into the slurry discharge tank.

[0013] Preferably, the top of the housing is provided with a top cover, the feed pipe is connected to the top cover and the ultrasonic longitudinal wave generator is disposed on the outer surface of the top cover, and the top cover is placed on the top cover support on the top of the housing.

[0014] Preferably, a drainage groove is provided on one side of the housing. The drainage groove is a vertically arranged through hole. A pipe support is provided on the outside of the drainage groove. The pipe support is a hollow cylindrical shape. The drainage groove is connected to the pipe support. A drainage pipe is slidably arranged inside the pipe support. The drainage pipe is movably installed on the support frame at the bottom of the housing through the drainage pipe support.

[0015] By adopting the above technical solution, the drainage pipe moves up and down in the drainage tank to draw out the mineral liquid at different water levels without interfering with the sedimentation process below.

[0016] Preferably, multiple turbidity monitoring devices are arranged sequentially from top to bottom inside the housing.

[0017] By adopting the above technical solution, multiple turbidity monitoring devices can detect the turbidity of multiple liquid surfaces, promptly feed back liquids that meet emission standards to the drainage pipe, and adjust the height of the drainage pipe to draw out the mineral liquid residue.

[0018] On the other hand, the sedimentation process for mineral liquid static separation provided by the present invention adopts the following technical solution:

[0019] A sedimentation process for the static separation of mineral liquid includes the following process steps:

[0020] Step 1: Pour the slurry into the settling device and let it stand for a period of time. Larger mineral powder particles will settle to the bottom of the settling tank.

[0021] Step 2: Cool the molten ore through cooling pipes, and continuously monitor the temperature of the molten ore during the cooling process;

[0022] Step 3: During the cooling process of the ore liquid, the magnetic grid plate is energized to generate magnetism, and the magnetic attraction of the metal particles accelerates the sedimentation of the ore powder.

[0023] Step 4: After most of the mineral powder particles have settled, turn on the ultrasonic longitudinal wave generator to vertically emit ultrasonic longitudinal waves, which promotes the aggregation of tiny mineral powder particles and causes them to settle under the attraction of the magnetic grid plate.

[0024] Step 5: Repeatedly turn on the ultrasonic longitudinal wave generator and the magnetic grid plate, and monitor the turbidity of the mineral liquid on both the upper and lower sides of the magnetic grid plate;

[0025] Step Six: When the turbidity of the slurry on the upper side of the magnetic grid plate reaches the predetermined value that indicates that sedimentation is complete, control the drain pipe on one side of the sedimentation device to slowly descend, and slowly discharge the liquid in the sedimentation device from top to bottom.

[0026] Step 7: Let the sediment at the bottom of the settling device flow out through the slurry discharge pipe, and then proceed with the settling of the next batch of ore liquid or clean the residual mineral powder particles in the settling device.

[0027] By adopting the above technical solutions, on the basis of traditional static sedimentation, the precipitation rate of mineral liquid is increased by cooling, the settling speed of mineral powder particles is accelerated by magnetic grid plate, the aggregation of mineral powder particles is improved by ultrasonic longitudinal wave generator, and the sedimented mineral liquid is discharged in layers through drainage pipe, thereby accelerating the sedimentation efficiency of mineral liquid.

[0028] Preferably, when pouring the slurry into the settling device in step one, it is either poured into the feed pipe through a pipeline or poured in directly after removing the top cover. Then, the top cover is used to seal the settling device, and the feed pipe is also sealed to create a closed space inside the settling device.

[0029] By adopting the above technical solutions, the two packing methods facilitate both one-time large-scale packing and small-scale replenishment packing. Small-scale replenishment packing can seal the settling device and reduce the emission of volatile harmful gases.

[0030] Preferably, when cooling the ore liquid in step two, the internal ore liquid temperature is monitored in real time and heat preservation treatment is performed on the outside of the settling device. When energizing the magnetic grid plate in step three, the energizing frequency is controlled to intermittently energize the magnetic grid plate and repeatedly apply electromagnetic force to the ore liquid intermittently.

[0031] By adopting the above technical solution, the heat preservation treatment helps to reduce the interference of the external environment on the settling device, and the intermittent application of electromagnetic force attracts the upper mineral powder particles through the pulse force generated by the electromagnetic force, while reducing the interference to the bottom mineral powder particles.

[0032] Preferably, in step five, the turbidity of the mineral liquid on both sides of the magnetic grid plate is monitored. Multiple turbidity monitoring devices installed from top to bottom inside the settling device detect the turbidity value of the mineral liquid from top to bottom, which is used as a reference for controlling the height of the drainage pipe.

[0033] By adopting the above technical solution, the height of the drainage pipe is automatically controlled to automatically drain the mineral liquid by detecting the turbidity value from top to bottom using multiple turbidity monitoring devices.

[0034] In summary, the present invention has the following beneficial technical effects:

[0035] 1. The settling plate can increase the settling area and the adhesion area of ​​mineral powder particles, thereby accelerating the settling of mineral powder particles. The magnetic grid plate increases the settling speed of mineral powder particles by attracting metal particles with a magnetic field. The magnetic grid plate generates and controls the magnetic field through an energized coil. The cooling pipe is used to cool the high-temperature mineral liquid, slow down the movement of mineral powder particles and increase the precipitation rate of mineral powder particles. The ultrasonic longitudinal wave generator improves the mutual coagulation effect of mineral powder particles by sending ultrasonic waves to the mineral liquid, thereby accelerating the settling speed of small mineral powder particles. At the same time, the longitudinal wave can increase the pressure on the mineral powder particles in the vertical direction, accelerating the settling of mineral powder particles.

[0036] 2. The slurry discharge tank is used to collect the precipitated mineral powder particles in the slurry. The guide plate is used to guide the precipitated mineral powder particles and reduce siltation. The settling inclined plate is used to increase the settling area and also to guide the settled mineral powder particles into the slurry discharge tank. The drain pipe moves up and down in the drain tank to draw out the slurry at different water levels without interfering with the sedimentation process below. Multiple turbidity monitoring devices can detect the turbidity of multiple liquid levels and promptly feed back the liquid that meets the discharge standards to the drain pipe, adjusting the height of the drain pipe to draw out the remaining slurry.

[0037] 3. Based on traditional static sedimentation, the precipitation rate of the ore solution is increased by cooling, the settling speed of the ore powder particles is accelerated by a magnetic grid plate, the aggregation of the ore powder particles is improved by an ultrasonic longitudinal wave generator, and the ore solution after sedimentation is discharged in layers through a drainage pipe, thereby accelerating the sedimentation efficiency of the ore solution.

[0038] 4. Two filling methods are available for convenient one-time large-scale filling and small-scale replenishment filling. Small-scale replenishment filling can seal the settling device, reducing the emission of volatile harmful gases. The heat preservation treatment helps to reduce the interference of the external environment on the settling device. Intermittent application of electromagnetic force attracts the upper mineral powder particles through the pulse force generated by electromagnetic force, while reducing the interference to the bottom mineral powder particles. The height of the drainage pipe is automatically controlled by detecting the turbidity value of the mineral liquid from top to bottom through multiple turbidity monitoring devices to achieve automatic drainage. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0040] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0041] Figure 3 This is a schematic diagram of the full section at the center plane;

[0042] Figure 4 for Figure 3 A magnified view of part A.

[0043] The dashed lines in the diagram are reference lines drawn to facilitate understanding of structural features and relationships.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Shell; 11. Support frame; 12. Top cover; 121. Feed pipe; 13. Top cover support; 14. Pipe support; 15. Drainage trough; 151. Drainage pipe; 152. Drainage pipe support; 16. Slurry discharge trough; 161. Slurry discharge pipe; 162. Guide plate; 2. Settling inclined plate; 21. Fixed cross plate; 3. Magnetic grid plate; 4. Ultrasonic longitudinal wave generator; 5. Cooling pipe; 6. Turbidity monitoring device. Detailed Implementation

[0046] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0047] Example 1:

[0048] This invention discloses a settling device for the static separation of mineral liquid, referring to... Figure 1-4 The system includes a shell 1 and a settling inclined plate 2. The settling inclined plate 2 is installed inside the shell 1. The top of the shell 1 has a feed inlet connected to a feed pipe 121. The bottom of the shell 1 has a discharge outlet connected to a slurry discharge pipe 161. A magnetic grid plate 3 is installed directly above the settling inclined plate 2. An energized coil is installed inside the magnetic grid plate 3. A cooling pipe 5 is also installed inside the shell 1. The cooling pipe 5 is connected to a heat exchange device. An ultrasonic longitudinal wave generator 4 is installed on the top of the shell 1. The ultrasonic longitudinal wave generators 4 are spaced apart and vertically downward.

[0049] The implementation method of Example 1 is as follows:

[0050] The slurry is poured into the settling device, and the slurry is cooled by the cooling pipe 5. The magnetic grid plate 3 is energized to generate magnetic attraction to the mineral powder particles to fall. The ultrasonic longitudinal wave generator 4 is turned on to emit ultrasonic longitudinal waves vertically, which promotes the aggregation of tiny mineral powder particles. The magnetic grid plate 3 is energized again, and finally the sediment at the bottom of the settling device flows out through the slurry discharge pipe 161.

[0051] Example 2:

[0052] Based on Example 1, the following is added:

[0053] Reference Figure 1-3 The bottom of the housing 1 is inclined towards the middle and a slurry discharge trough 16 is installed at the inclined bottom end. The bottom of the slurry discharge trough 16 is inclined to one side and a slurry discharge pipe 161 is connected at the inclined bottom end. A guide plate 162 is provided at intervals on the upper part of the slurry discharge trough 16. The guide plate 162 is inclined and the inclination direction is opposite to the inclination direction of the bottom of the slurry discharge trough 16.

[0054] Reference Figure 2 and 3 The settling inclined plate 2 is composed of multiple rectangular frames arranged in a multi-square shape, and each rectangular frame is inclined inward and installed near the bottom of the inner side of the shell 1 by fixing cross plate 21.

[0055] Reference Figure 1-3 The housing 1 is provided with a top cover 12, the feed pipe 121 is connected to the top cover 12 and the ultrasonic longitudinal wave generator 4 is provided on the outer surface of the top cover, and the top cover 12 is placed on the top cover support 13 at the top of the housing 1.

[0056] Reference Figure 1-4The housing 1 has a drainage groove 15 on one side, which is a vertically arranged through hole. A pipe support 14 is provided on the outside of the drainage groove 15. The pipe support 14 is a hollow cylinder. The drainage groove 15 is connected to the pipe support 14. A drainage pipe 151 is slidably arranged inside the pipe support 14. The drainage pipe 151 is movably installed on the support frame 11 at the bottom of the housing 1 through the drainage pipe support 152.

[0057] Reference Figure 3 Multiple turbidity monitoring devices 6 are arranged sequentially from top to bottom inside the housing 1.

[0058] The implementation method of Example 2 is as follows:

[0059] Once the turbidity of the slurry on the upper side of the magnetic grid plate 3 reaches a predetermined value that indicates the sedimentation is complete, the drain pipe 151 on one side of the sedimentation device is slowly lowered to gradually drain the liquid from the sedimentation device from top to bottom. Example

[0060] This invention discloses a sedimentation process for the static separation of mineral liquid, comprising the following process steps:

[0061] Step 1: Pour the slurry into the settling device and let it stand for a period of time. Larger mineral powder particles will settle to the bottom of the settling tank.

[0062] Step 2: Cool the molten ore through cooling pipe 5, and continuously monitor the temperature of the molten ore during the cooling process;

[0063] Step 3: During the cooling process of the ore liquid, the magnetic grid plate 3 is energized to generate magnetism, and the magnetic attraction of metal particles accelerates the sedimentation of ore powder particles.

[0064] Step 4: After most of the mineral powder particles have settled, turn on the ultrasonic longitudinal wave generator 4 to vertically emit ultrasonic longitudinal waves, which promotes the aggregation of tiny mineral powder particles and causes them to settle under the attraction of the magnetic grid plate 3.

[0065] Step 5: Repeatedly turn on the ultrasonic longitudinal wave generator 4 and the magnetic grid plate 3, and monitor the turbidity of the mineral liquid on both the upper and lower sides of the magnetic grid plate 3.

[0066] Step 6: When the turbidity of the mineral liquid on the upper side of the magnetic grid plate 3 reaches the predetermined value that can be judged as the sedimentation is complete, control the drain pipe 151 on one side of the sedimentation device to slowly descend, and slowly discharge the liquid in the sedimentation device from top to bottom.

[0067] Step 7: Let the sediment at the bottom of the settling device flow out through the slurry discharge pipe 161, and then carry out the settling of the next batch of mineral liquid or clean the residual mineral powder particles in the settling device.

[0068] Example 4:

[0069] Based on Example 3, the following is added:

[0070] When pouring the slurry into the settling device as described in step one, it can be poured into the feed pipe 121 through the pipeline or directly poured in after removing the top cover 12. Then, the top cover 12 is used to seal the settling device, and the feed pipe 121 is also sealed to form a closed space inside the settling device.

[0071] When cooling the ore liquid in step two, the internal temperature of the ore liquid is monitored in real time and heat preservation treatment is performed on the outside of the settling device. When energizing the magnetic grid plate 3 in step three, the energizing frequency is controlled to intermittently energize the magnetic grid plate 3, and electromagnetic force is repeatedly applied to the ore liquid intermittently.

[0072] Step 5 involves monitoring the turbidity of the mineral liquid on both sides of the magnetic grid plate 3. Multiple turbidity monitoring devices 6, installed from top to bottom inside the settling device, detect the turbidity value of the mineral liquid from top to bottom, which is used as a reference for controlling the height of the drain pipe 151.

[0073] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A settling device for the static separation of mineral liquid, characterized in that: It includes a shell (1) and a settling inclined plate (2). The settling inclined plate (2) is provided inside the shell (1). The top of the shell (1) has a feed inlet and is connected to a feed pipe (121). The bottom of the shell (1) has a discharge outlet and is connected to a slurry discharge pipe (161). A magnetic grid plate (3) is provided directly above the settling inclined plate (2), and an energized coil is provided inside the magnetic grid plate (3); The housing (1) is also provided with a cooling pipe (5), and the cooling pipe (5) is connected to a heat exchange device. An ultrasonic longitudinal wave generator (4) is provided on the top of the housing (1), and the ultrasonic longitudinal wave generators (4) are spaced apart from each other and vertically downward. The bottom of the shell (1) is inclined towards the middle and a slurry discharge trough (16) is installed at the inclined bottom end. The bottom of the slurry discharge trough (16) is inclined to one side and a slurry discharge pipe (161) is connected at the inclined bottom end. A guide plate (162) is provided at intervals on the upper part of the slurry discharge trough (16). The guide plate (162) is inclined and the inclination direction is opposite to the inclination direction of the bottom of the slurry discharge trough (16). The settling inclined plate (2) is composed of multiple rectangular frames arranged in a multi-return shape, and each rectangular frame is inclined inward and installed near the bottom of the shell (1) through a fixed cross plate (21). A drainage groove (15) is provided on one side of the housing (1). The drainage groove (15) is a vertically arranged through hole. A pipe support (14) is provided on the outside of the drainage groove (15). The pipe support (14) is a hollow cylindrical shape. The drainage groove (15) is connected to the pipe support (14). A drainage pipe (151) is slidably arranged inside the pipe support (14). The drainage pipe (151) is movably installed on the support frame (11) at the bottom of the housing (1) through the drainage pipe support (152).

2. A settling device for mineral liquid static separation according to claim 1, characterized in that: The top of the housing (1) is provided with a top cover (12), the feed pipe (121) is connected to the top cover (12) and the ultrasonic longitudinal wave generator (4) is provided on the outer surface of the top cover. The top cover (12) is placed on the top cover support (13) on the top of the housing (1).

3. A settling device for mineral liquid static separation according to claim 1, characterized in that: Multiple turbidity monitoring devices (6) are arranged sequentially from top to bottom inside the housing (1).

4. A sedimentation process for the static separation of mineral liquid, characterized in that, The sedimentation process using the sedimentation device for mineral liquid static separation as described in claim 1 includes the following steps: Step 1: Pour the slurry into the settling device and let it stand for a period of time. Larger mineral powder particles will settle to the bottom of the settling tank. Step 2: Cool the molten ore through the cooling pipe (5), and continuously monitor the temperature of the molten ore during the cooling process; Step 3: During the cooling process of the ore liquid, the magnetic grid plate (3) is energized to generate magnetism, and the magnetic attraction of the metal particles accelerates the sedimentation of the ore powder particles. Step 4: After most of the mineral powder particles have settled, turn on the ultrasonic longitudinal wave generator (4) to vertically emit ultrasonic longitudinal waves, which promotes the aggregation of tiny mineral powder particles, and at the same time, they settle under the attraction of the magnetic grid plate (3). Step 5: Repeatedly turn on the ultrasonic longitudinal wave generator (4) and the magnetic grid plate (3) and monitor the turbidity of the mineral liquid on the upper and lower sides of the magnetic grid plate (3); Step 6: When the turbidity of the mineral liquid on the upper side of the magnetic grid plate (3) reaches the predetermined value that can be judged as the sedimentation is complete, control the drain pipe (151) on one side of the sedimentation device to slowly descend and slowly discharge the liquid in the sedimentation device from top to bottom. Step 7: Let the sediment at the bottom of the settling device flow out through the slurry discharge pipe (161), and then carry out the settling of the next batch of mineral liquid or clean the residual mineral powder particles in the settling device.

5. A sedimentation process for mineral liquid static separation according to claim 4, characterized in that: When pouring the slurry into the settling device as described in step one, it can be poured into the feed pipe (121) through the pipeline or directly poured in after removing the top cover (12). Then, the top cover (12) is used to seal the settling device, and the feed pipe (121) is also sealed to form a closed space inside the settling device.

6. A sedimentation process for mineral liquid static separation according to claim 4, characterized in that: When cooling the ore liquid in step two, the internal ore liquid temperature is monitored in real time and heat preservation treatment is carried out on the outside of the settling device. When energizing the magnetic grid plate (3) in step three, the energizing frequency is controlled to intermittently energize the magnetic grid plate (3) and repeatedly apply electromagnetic force to the ore liquid intermittently.

7. The sedimentation process for mineral liquid static separation according to claim 4, characterized in that: Step 5 involves monitoring the turbidity of the mineral liquid on both sides of the magnetic grid plate (3). Multiple turbidity monitoring devices (6) installed from top to bottom in the settling device detect the turbidity value of the mineral liquid from top to bottom, which is used as a reference to control the height of the drain pipe (151).

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