Magnetic separation equipment for improving fluorite concentrate grade

Abstract

The utility model discloses magnetic separation equipment for improving the grade of fluorite concentrate, which relates to the technical field of mineral separation and comprises a first feeding box, a first drum screen, a first gradient high-intensity magnetic separator, a flotation machine, a second feeding box, a second drum screen, a second gradient high-intensity magnetic separator and a third gradient high-intensity magnetic separator. The top of the first gradient high-intensity magnetic separator is used for being communicated with the bottom of the first drum screen to output first-grade fluorite concentrate; the flotation machine communicates with the first gradient high-intensity magnetic separator to receive the first-grade fluorite concentrate, desliming flotation can be conducted on the first-grade fluorite concentrate, and second-grade fluorite concentrate is output; the top of the second gradient high-intensity magnetic separator is used for being communicated with the bottom of the second drum screen to output third-grade fluorite concentrate; the third gradient high-intensity magnetic separator can purify and sort third-grade fluorite concentrate and output fourth-grade fluorite secondary concentrate and fifth-grade fluorite concentrate, the structure is simple, and fluorite ore is efficiently recycled.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ore dressing, particularly to a magnetic separation equipment for improving fluorite concentrate grade. BACKGROUND

[0002] In 2011, Baotou Steel Group carried out the project of Baotou Oxide Ore Dressing Relocation and Baiyunebo Mine Resource Comprehensive Utilization Engineering. In addition to iron concentrate and rare earth concentrate products, fluorite selection and niobium ore selection were taken as new highlights to increase the recovery of fluorite concentrate and niobium concentrate. However, the original design process was used for fluorite concentrate sorting, which could not normally promote industrialization. The fluorite concentrate grade remained at about 60%, which was unstable, and there was no fluorite concentrate product on the ground, and the production lagged behind. SUMMARY

[0003] The utility model aims at providing a magnetic separation equipment for improving fluorite concentrate grade to solve the problems of the prior art, which has a simple structure and efficiently recovers fluorite ore.

[0004] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0005] The utility model provides a magnetic separation equipment for improving fluorite concentrate grade, which comprises: a first ore feeding box, a first cylindrical screen, a first gradient high-intensity magnetic separator, a flotation machine, a second ore feeding box, a second cylindrical screen, a second gradient high-intensity magnetic separator and a third gradient high-intensity magnetic separator. The first ore feeding box is used for receiving fluorite ore slurry and buffering and adjusting the flow of the fluorite ore slurry. The top of the first cylindrical screen is connected and communicated with the bottom of the first ore feeding box to remove large-particle impurities in the fluorite ore slurry. The top of the first gradient high-intensity magnetic separator is connected and communicated with the bottom of the first cylindrical screen, and can throw out weakly magnetic impurity minerals in the fluorite ore slurry to output first-grade fluorite concentrate. The flotation machine is connected and communicated with the first gradient high-intensity magnetic separator to receive the first-grade fluorite concentrate and can deslime and float the first-grade fluorite concentrate to output second-grade fluorite concentrate. The second ore feeding box is connected and communicated with the flotation machine to receive the second-grade fluorite concentrate and can buffer and adjust the flow of the second-grade fluorite concentrate. The top of the second cylindrical screen is connected and communicated with the bottom of the second ore feeding box. The top of the second gradient high-intensity magnetic separator is connected and communicated with the bottom of the second cylindrical screen, and can throw out weakly magnetic impurity minerals in the second-grade fluorite concentrate to output third-grade fluorite concentrate. The third gradient high-intensity magnetic separator is connected and communicated with the second gradient high-intensity magnetic separator, and can purify and sort the third-grade fluorite concentrate to output fourth-grade fluorite sub-concentrate and fifth-grade fluorite concentrate.

[0006] Preferably, the first pipeline, the second pipeline, the third pipeline and the first conveying pump are further included, one end of the first pipeline is communicated with the first feeding box, the other end is communicated with the source of the fluorite ore slurry, the first conveying pump is arranged on the first pipeline, one end of the second pipeline is connected with the first pipeline and communicated, the other end is communicated with the first tail outlet of the first gradient high-intensity magnetic separator to guide the first tailings screened by the first gradient high-intensity magnetic separator into the first pipeline, one end of the third pipeline is connected with the first pipeline and communicated, the other end is communicated with the second tail outlet of the second gradient high-intensity magnetic separator to guide the second tailings screened by the second gradient high-intensity magnetic separator into the first pipeline.

[0007] Preferably, the first rubber plug and the fourth pipeline are further included, the bottom of the first feeding box is provided with a first discharge port, one end of the fourth pipeline is communicated with the first discharge port, the other end is communicated with the first cylindrical screen, the first rubber plug is arranged at the first discharge port to control the flow of the first discharge port.

[0008] Preferably, the fifth pipeline is further included, one end of the fifth pipeline is communicated with the first cylindrical screen, the other end is communicated with the first gradient high-intensity magnetic separator, the first gradient high-intensity magnetic separator is a 1.7T high-intensity magnetic separator.

[0009] Preferably, the sixth pipeline and the second conveying pump are further included, one end of the sixth pipeline is communicated with the first product outlet of the first gradient high-intensity magnetic separator, the other end is communicated with the flotation machine, the second conveying pump is arranged on the sixth pipeline.

[0010] Preferably, the seventh pipeline and the third conveying pump are further included, one end of the seventh pipeline is communicated with the flotation machine, the other end is communicated with the second feeding box.

[0011] Preferably, the second rubber plug and the eighth pipeline are further included, the bottom of the second feeding box is provided with a second discharge port, one end of the eighth pipeline is communicated with the second discharge port, the other end is communicated with the second cylindrical screen, the second rubber plug is arranged at the second discharge port to control the flow of the second discharge port.

[0012] Preferably, the ninth pipeline is further included, one end of the ninth pipeline is communicated with the second cylindrical screen, the other end is communicated with the second gradient high-intensity magnetic separator, the second gradient high-intensity magnetic separator is a 1.7T high-intensity magnetic separator.

[0013] Preferably, the tenth pipeline, the eleventh pipeline, the twelfth pipeline and the fourth conveying pump are further included, one end of the tenth pipeline is communicated with the second gradient magnetic separator, the other end is communicated with the third gradient magnetic separator, the fourth conveying pump is arranged on the tenth pipeline, one end of the eleventh pipeline is communicated with the third gradient magnetic separator, the other end is communicated with the fourth grade fluorite sub- concentrate collecting device, one end of the twelfth pipeline is communicated with the third gradient magnetic separator, the other end is communicated with the fifth grade fluorite concentrate collecting device, and the third gradient magnetic separator is a 5T high gradient superconducting magnetic separator.

[0014] Preferably, the first grade fluorite concentrate is a fluorite concentrate with a grade of 82%-83%, the second grade fluorite concentrate is a fluorite concentrate with a grade of 85%-86%, the third grade fluorite concentrate is a fluorite concentrate with a grade of 88%, the fourth grade fluorite sub-concentrate is a fluorite concentrate with a grade of 80%, and the fifth grade fluorite concentrate is a fluorite concentrate with a grade of 95%.

[0015] The utility model discloses relative to prior art has obtained following technical effect:

[0016] The utility model provides a kind of magnetic separation equipment for improving fluorite concentrate grade, by the combination process of multistage magnetic separation and flotation, gradually remove weak magnetic impurity minerals and impurities such as argillaceous in fluorite slurry, significantly improve the fluorite concentrate grade of final output.From initial fluorite slurry through the processing of first gradient magnetic separator, flotation machine, second gradient magnetic separator and third gradient magnetic separator, the grade of fifth grade fluorite concentrate is greatly promoted to 95%, meet the market demand of high grade fluorite concentrate;In addition, the setting of first feed bin and second feed bin effectively buffers and adjusts the flow of slurry, which enables the entire magnetic separation equipment combination system to maintain a stable feed speed during operation, avoiding the impact of excessive flow fluctuations on separation efficiency and equipment life.Stable flow is also conducive to the coordinated operation of each device, improving production efficiency;First cylinder screen and second cylinder screen remove large particle impurities in different stages of slurry respectively, prevent these impurities from damaging magnetic separators and other equipment, reduce the probability of equipment failure.In addition, cylinder screen also carries out preliminary particle size classification on slurry, provides more suitable slurry particle size distribution for subsequent magnetic separation process, improves magnetic separation efficiency and precision. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will be briefly introduced the drawings needed to be used in the embodiments, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0018] Figure 1 The magnetic separation equipment for improving the grade of fluorite concentrate provided by the utility model has the advantages of simple structure, high efficiency and high recovery rate of fluorite ore.

[0019] In the figure: 1, first feeding box; 2, first cylinder screen; 3, first gradient high intensity magnetic separator; 4, flotation machine; 5, second feeding box; 6, second cylinder screen; 7, second gradient high intensity magnetic separator; 8, third gradient high intensity magnetic separator. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0021] The utility model aims at providing a kind of magnetic separation equipment for improving the grade of fluorite concentrate to solve the problems existing in the above prior art, and it has the advantages of simple structure, high efficiency and high recovery rate of fluorite ore.

[0022] In order to make the above purposes, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0023] The utility model provides a kind of magnetic separation equipment for improving the grade of fluorite concentrate, as shown in Figure 1As shown, it comprises: a first feeding box 1, a first cylinder screen 2, a first gradient high-intensity magnetic separator 3, a flotation machine 4, a second feeding box 5, a second cylinder screen 6, a second gradient high-intensity magnetic separator 7, a third gradient high-intensity magnetic separator 8, the first feeding box 1 is used to receive the fluorite ore slurry and buffer and adjust the flow of the fluorite ore slurry; the top of the first cylinder screen 2 is used to be connected with and communicate with the bottom of the first feeding box 1 to remove the large-particle impurities in the fluorite ore slurry; the top of the first gradient high-intensity magnetic separator 3 is used to be connected with and communicate with the bottom of the first cylinder screen 2, and can throw out the weakly magnetic impurity minerals in the fluorite ore slurry to output the first-grade fluorite concentrate; the flotation machine 4 is connected with and communicates with the first gradient high-intensity magnetic separator 3 to receive the first-grade fluorite concentrate and can carry out desliming flotation on the first-grade fluorite concentrate and output the second-grade fluorite concentrate; the second feeding box 5 is connected with and communicates with the flotation machine 4 to receive the second-grade fluorite concentrate and can buffer and adjust the flow of the second-grade fluorite concentrate; the top of the second cylinder screen 6 is connected with and communicates with the bottom of the second feeding box 5; the top of the second gradient high-intensity magnetic separator 7 is used to be connected with and communicate with the bottom of the second cylinder screen 6, and can throw out the weakly magnetic impurity minerals in the second-grade fluorite concentrate to output the third-grade fluorite concentrate; the third gradient high-intensity magnetic separator 8 is connected with and communicates with the second gradient high-intensity magnetic separator 7, the third gradient high-intensity magnetic separator 8 can carry out purification and separation on the third-grade fluorite concentrate and output the fourth-grade fluorite sub-concentrate and the fifth-grade fluorite concentrate, through the combined process of multi-stage magnetic separation and flotation, the weakly magnetic impurity minerals and impurities such as argillaceous in the fluorite ore slurry are gradually removed, and the grade of the finally output fluorite concentrate is significantly improved. From the initial fluorite ore slurry, through the processing of the first gradient high-intensity magnetic separator 3, the flotation machine 4, the second gradient high-intensity magnetic separator 7 and the third gradient high-intensity magnetic separator 8, the grade of the fifth-grade fluorite concentrate is greatly improved to 95%, which meets the market demand for high-grade fluorite concentrate; in addition, the setting of the first feeding box 1 and the second feeding box 5 effectively buffers and adjusts the flow of the ore slurry, which enables the entire magnetic separation equipment combination system to maintain a stable feeding speed during operation, avoiding the influence of excessive flow fluctuation on the separation effect and equipment life. At the same time, stable flow is also conducive to the coordinated operation between devices, improving production efficiency; the first cylinder screen 2 and the second cylinder screen 6 respectively remove large-particle impurities in the ore slurry at different stages, preventing these impurities from damaging the magnetic separator and other equipment, and reducing the probability of equipment failure. In addition, the cylinder screen also preliminarily classifies the particle size of the ore slurry, providing a more suitable ore slurry particle size distribution for the subsequent magnetic separation process, improving the magnetic separation efficiency and precision.

[0024] In a preferred embodiment, the magnetic separation device for improving the grade of fluorite concentrate further comprises a first pipeline, a second pipeline, a third pipeline and a first conveying pump, one end of the first pipeline is in communication with the first feeding box 1, the other end is in communication with a fluorite ore slurry source, the first conveying pump is arranged on the first pipeline, one end of the second pipeline is connected with the first pipeline and in communication, the other end is in communication with the first tailings outlet of the first gradient high-intensity magnetic separator 3 to guide the first tailings screened by the first gradient high-intensity magnetic separator 3 into the first pipeline, one end of the third pipeline is connected with the first pipeline and in communication, the other end is in communication with the second tailings outlet of the second gradient high-intensity magnetic separator 7 to guide the second tailings screened by the second gradient high-intensity magnetic separator 7 into the first pipeline, the first pipeline and the first conveying pump ensure that the fluorite ore slurry can be stably conveyed to the first feeding box 1. The second pipeline and the third pipeline guide the first tailings and the second tailings into the first pipeline again, realize the reprocessing of the tailings, improve the resource utilization rate and reduce the waste.

[0025] In a preferred embodiment, the magnetic separation device for improving the grade of fluorite concentrate further comprises a first rubber plug and a fourth pipeline, the bottom of the first feeding box 1 is provided with a first discharge port, one end of the fourth pipeline is in communication with the first discharge port, the other end is in communication with the first cylindrical screen 2, the first rubber plug is arranged at the first discharge port to control the flow of the first discharge port, the first rubber plug can accurately control the discharge flow of the first feeding box 1, ensure that the fluorite ore slurry enters the first cylindrical screen 2 at a suitable speed, avoid damage to the cylindrical screen caused by excessive flow, and at the same time ensure the stability of the subsequent processing process.

[0026] In a preferred embodiment, the magnetic separation device for improving the grade of fluorite concentrate further comprises a fifth pipeline, one end of the fifth pipeline is in communication with the first cylindrical screen 2, the other end is in communication with the first gradient high-intensity magnetic separator 3, the first gradient high-intensity magnetic separator 3 is a 1.7T high-intensity magnetic separator, the fifth pipeline connects the first cylindrical screen 2 and the first gradient high-intensity magnetic separator 3, ensures that the fluorite ore slurry treated by the impurity separation can smoothly enter the high-intensity magnetic separator for removal of weakly magnetic impurity minerals, and prepares for the next step of improving the grade of fluorite concentrate.

[0027] In a preferred embodiment, the magnetic separation device for improving the grade of fluorite concentrate further comprises a sixth pipeline and a second conveying pump, one end of the sixth pipeline is in communication with the first product outlet of the first gradient high-intensity magnetic separator 3, the other end is in communication with the flotation machine 4, the second conveying pump is arranged on the sixth pipeline, the second conveying pump pumps the first grade fluorite concentrate to the flotation machine 4 through the sixth pipeline, ensures the stable conveying of the ore slurry, so that the first grade fluorite concentrate can be timely desliming and flotation treatment, and improves the production efficiency.

[0028] In a preferred embodiment, the magnetic separation device for improving the grade of fluorite concentrate further comprises a seventh pipeline and a third conveying pump, one end of the seventh pipeline is in communication with the flotation machine 4, and the other end is in communication with the second feed bin 5, the third conveying pump and the seventh pipeline convey the second grade fluorite concentrate after flotation treatment to the second feed bin 5, ensuring efficient circulation of the ore slurry between different devices and providing stable feed for subsequent processing steps.

[0029] In a preferred embodiment, the magnetic separation device for improving the grade of fluorite concentrate further comprises a second rubber plug and an eighth pipeline, the bottom of the second feed bin 5 is provided with a second discharge port, one end of the eighth pipeline is in communication with the second discharge port, and the other end is in communication with the second cylindrical screen 6, the second rubber plug is arranged at the second discharge port to control the flow of the second discharge port, the second rubber plug controls the discharge flow of the second feed bin 5, so that the second grade fluorite concentrate slurry enters the second cylindrical screen 6 for impurity separation treatment at a suitable speed, ensuring the stability and reliability of the subsequent processing process.

[0030] In a preferred embodiment, the magnetic separation device for improving the grade of fluorite concentrate further comprises a ninth pipeline, one end of the ninth pipeline is in communication with the second cylindrical screen 6, and the other end is in communication with the second gradient high-intensity magnetic separator 7, the second gradient high-intensity magnetic separator 7 is a 1.7T high-intensity magnetic separator, the ninth pipeline connects the second cylindrical screen 6 and the second gradient high-intensity magnetic separator 7, ensuring that the second grade fluorite concentrate after impurity separation treatment can smoothly enter the high-intensity magnetic separator for further removal of weakly magnetic impurity minerals, thereby improving the grade of fluorite concentrate.

[0031] In a preferred embodiment, the magnetic separation device for improving the grade of fluorite concentrate further comprises a tenth pipeline, an eleventh pipeline, a twelfth pipeline and a fourth conveying pump, one end of the tenth pipeline is in communication with the second gradient high-intensity magnetic separator 7, and the other end is in communication with the third gradient high-intensity magnetic separator 8, the fourth conveying pump is arranged on the tenth pipeline, one end of the eleventh pipeline is in communication with the third gradient high-intensity magnetic separator 8, and the other end is in communication with the fourth grade fluorite sub-concentrate collecting device, one end of the twelfth pipeline is in communication with the third gradient high-intensity magnetic separator 8, and the other end is in communication with the fifth grade fluorite concentrate collecting device, the third gradient high-intensity magnetic separator 8 is a 5T high gradient superconducting magnetic separator, the fourth conveying pump and the tenth pipeline pump the third grade fluorite concentrate slurry to the third gradient high-intensity magnetic separator 8 for purification and separation. The eleventh pipeline and the twelfth pipeline convey fluorite concentrate of different grades to the corresponding collecting devices respectively, realizing classified collection of products and improving the degree of refinement of production.

[0032] In a preferred embodiment, the first grade fluorite concentrate is a fluorite concentrate with a grade of 82%-83%, the second grade fluorite concentrate is a fluorite concentrate with a grade of 85%-86%, the third grade fluorite concentrate is a fluorite concentrate with a grade of 88%, the fourth grade fluorite sub-concentrate is a fluorite concentrate with a grade of 80%, and the fifth grade fluorite concentrate is a fluorite concentrate with a grade of 95%, which clearly defines the grades of fluorite concentrates at different stages, making the target of the entire production process more clear. By gradually increasing the grade, a high-grade fifth grade fluorite concentrate is finally obtained, which meets the market demand for high-quality fluorite concentrate.

[0033] The utility model provides a kind of method for using the magnetic separation equipment of improving fluorite concentrate grade comprising the following steps:

[0034] 1) the fluorite ore slurry with granularity-200 mesh accounting for 94%-95%, -325 mesh accounting for 85%, grade 60% or so, concentration 40%±5 is pumped into the first ore feeder box 1, the first discharge port of the first ore feeder box 1 passes through first rubber plug control flow, fluorite ore slurry is first separated by first barrel screen, and then flows into the ore feeding pipeline of the first gradient high-intensity magnetic separator 3, after being separated by 1.7T high-intensity magnetic field, middlings and tailings of the first gradient high-intensity magnetic separator 3 are combined as first tailings;Detailed description of the initial feeding condition of the equipment and the first step processing process. Through the first ore feeder box 1 and the first rubber plug control flow, the stable input of the ore slurry is guaranteed. After being separated by the first cylinder screen 2, the first gradient high-intensity magnetic separator 3 can effectively remove weakly magnetic impurity minerals, laying a foundation for subsequent processing.

[0035] 2) the first grade fluorite concentrate with grade 82%-83% of high-intensity fluorite concentrate output by the first gradient high-intensity magnetic separator 3 is pumped to the flotation machine 4 by the second delivery pump, and after desliming flotation of the first grade fluorite concentrate, the second grade fluorite concentrate with grade 85%-86% is floated out, and the flotation concentrate has a concentration of 35%-40%, which is pumped to the second ore feeder box 5 by the third delivery pump, the second discharge port of the second ore feeder box 5 passes through the second rubber plug control flow, the second grade fluorite concentrate slurry is first separated by the second barrel screen, and then flows into the second gradient high-intensity magnetic separator 7, after being separated by 1.7T high-intensity magnetic field, middlings and tailings of the second gradient high-intensity magnetic separator 7 are combined as second tailings;This step shows the process of obtaining the second grade fluorite concentrate with higher grade from the first grade fluorite concentrate after flotation treatment. The delivery pump ensures the stable circulation of the ore slurry, and the second ore feeder box 5 and the second rubber plug control flow again ensure the stability of the system. After being separated by the second cylinder screen 6, the second gradient high-intensity magnetic separator 7 further removes impurity minerals, improving the grade of fluorite concentrate.

[0036] 3) The third grade fluorite concentrate with a grade of 88% output by the second high gradient magnetic separator 7 is pumped into the third high gradient magnetic separator 8 by the fourth delivery pump, and the superconducting fluorite concentrate with a grade of 95% is obtained after purification by the 5T high gradient field, and the fourth grade fluorite sub-concentrate with a grade of 80% is obtained.

[0037] 4) The fifth grade fluorite concentrate and the fourth grade fluorite sub-concentrate are filtered in the filtering system.

[0038] 5) The first tailings and the second tailings are ground in the ball mill and then fed into the first feeding box 1.

[0039] In step 1), the particle size of the feed into the first high gradient magnetic separator 3 is 94%-95% of-200 mesh and 85% of-325 mesh.

[0040] Further, in step 1), the separation density of the first high gradient magnetic separator 3 is 40%±5, the SS (suspended solids content) of the magnetic separator flushing water is less than or equal to 20 mg / L, and the feed amount of the first high gradient magnetic separator 3 is 45 t / h+±10 (dry basis).

[0041] Further, in step 2), the separation density of the second high gradient magnetic separator 7 is 40%±5, the SS (suspended solids content) of the magnetic separator flushing water is less than or equal to 20 mg / L, and the feed amount of the second high gradient magnetic separator 7 is 45 t / h+±10 (dry basis).

[0042] Further, in step 3), the separation density of the third high gradient magnetic separator 8 is 20%±5, the SS (suspended solids content) of the flushing water is less than or equal to 10 mg / L, and the feed amount of the third high gradient magnetic separator 8 is 3 t / h-45 t / h+±1 (dry basis). The specific parameter requirements of the high gradient magnetic separators in each stage are clarified, which provides a basis for the operation and optimization of the equipment. Strict control of parameters such as particle size, separation density and suspended solids content can improve the separation effect and efficiency of the magnetic separator and ensure the grade and quality of the fluorite concentrate.

[0043] The principles and implementation modes of the specific examples are described in the utility model, and the above examples are only used to help understand the method and core idea of the utility model; meanwhile, for those skilled in the art, the specific implementation modes and application ranges will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as a limitation of the utility model.

Claims

1. A magnetic separation apparatus for upgrading the grade of a fluorite concentrate, characterised in that: The application relates to a fluorite ore processing system, which comprises: a first feeding box for receiving fluorite ore slurry and buffering and adjusting the flow of the fluorite ore slurry; a first cylinder screen, the top of which is connected with and communicates with the bottom of the first feeding box to remove large-particle impurities in the fluorite ore slurry; a first gradient high-intensity magnetic separator, the top of which is connected with and communicates with the bottom of the first cylinder screen and can throw out weakly-magnetic impurity minerals in the fluorite ore slurry to output first-grade fluorite concentrate; a flotation machine, which is connected with and communicates with the first gradient high-intensity magnetic separator to receive the first-grade fluorite concentrate and can perform desliming flotation on the first-grade fluorite concentrate and output second-grade fluorite concentrate; a second feeding box, which is connected with and communicates with the flotation machine to receive the second-grade fluorite concentrate and can buffer and adjust the flow of the second-grade fluorite concentrate; a second cylinder screen, the top of which is connected with and communicates with the bottom of the second feeding box; a second gradient high-intensity magnetic separator, the top of which is connected with and communicates with the bottom of the second cylinder screen and can throw out weakly-magnetic impurity minerals in the second-grade fluorite concentrate to output third-grade fluorite concentrate; and a third gradient high-intensity magnetic separator, which is connected with and communicates with the second gradient high-intensity magnetic separator and can perform purification separation on the third-grade fluorite concentrate and output fourth-grade fluorite sub-concentrate and fifth-grade fluorite concentrate. The application further comprises a first pipeline, a second pipeline, a third pipeline and a first conveying pump, one end of the first pipeline is connected with and communicates with the first feeding box, the other end of the first pipeline is connected with and communicates with a fluorite ore slurry source, the first conveying pump is arranged on the first pipeline, one end of the second pipeline is connected with and communicates with the first pipeline, the other end of the second pipeline is connected with and communicates with a first tail outlet of the first gradient high-intensity magnetic separator to guide first tailing screened by the first gradient high-intensity magnetic separator into the first pipeline, one end of the third pipeline is connected with and communicates with the first pipeline, the other end of the third pipeline is connected with and communicates with a second tail outlet of the second gradient high-intensity magnetic separator to guide second tailing screened by the second gradient high-intensity magnetic separator into the first pipeline.

2. The magnetic separation apparatus for upgrading the grade of a fluorite concentrate according to claim 1, characterized in that: The application further comprises a first rubber plug and a fourth pipeline, the bottom of the first feeding box is provided with a first discharge port, one end of the fourth pipeline is connected with and communicates with the first discharge port, the other end of the fourth pipeline is connected with and communicates with the first cylinder screen, and the first rubber plug is arranged on the first discharge port to control the flow of the first discharge port.

3. The magnetic separation apparatus for upgrading the grade of a fluorite concentrate according to claim 2, characterized in that: The application further comprises a fifth pipeline, one end of the fifth pipeline is connected with and communicates with the first cylinder screen, the other end of the fifth pipeline is connected with and communicates with the first gradient high-intensity magnetic separator, and the first gradient high-intensity magnetic separator is a 1.7T high-intensity magnetic separator.

4. The magnetic separation apparatus for upgrading the grade of a fluorite concentrate according to claim 3, characterized in that: The application further comprises a sixth pipeline and a second conveying pump, one end of the sixth pipeline is connected with and communicates with a first product outlet of the first gradient high-intensity magnetic separator, the other end of the sixth pipeline is connected with and communicates with the flotation machine, and the second conveying pump is arranged on the sixth pipeline.

5. The magnetic separation apparatus for upgrading the grade of a fluorite concentrate according to claim 4, characterized in that: The application further comprises a seventh pipeline and a third conveying pump, one end of the seventh pipeline is connected with and communicates with the flotation machine, the other end of the seventh pipeline is connected with and communicates with the second feeding box.

6. The magnetic separation apparatus for upgrading the grade of a fluorite concentrate according to claim 5, characterized in that: ​ 7. The magnetic separation apparatus for upgrading the grade of a fluorite concentrate according to claim 6, characterized in that: The second rubber plug and the eighth pipeline are further included, the bottom of the second feeding box is provided with a second discharge port, one end of the eighth pipeline is communicated with the second discharge port, and the other end of the eighth pipeline is communicated with the second cylindrical screen, and the second rubber plug is arranged on the second discharge port to control the flow of the second discharge port.

8. The magnetic separation apparatus for upgrading the grade of a fluorite concentrate according to claim 7, characterized in that: The ninth pipeline is further included, one end of the ninth pipeline is communicated with the second cylindrical screen, and the other end of the ninth pipeline is communicated with the second gradient high-intensity magnetic separator, and the second gradient high-intensity magnetic separator is a 1.7T high-intensity magnetic separator.

9. The magnetic separation apparatus for upgrading the grade of a fluorite concentrate according to claim 8, characterized in that: The tenth pipeline, the eleventh pipeline, the twelfth pipeline and the fourth conveying pump are further included, one end of the tenth pipeline is communicated with the second gradient high-intensity magnetic separator, and the other end of the tenth pipeline is communicated with the third gradient high-intensity magnetic separator, the fourth conveying pump is arranged on the tenth pipeline, one end of the eleventh pipeline is communicated with the third gradient high-intensity magnetic separator, and the other end of the eleventh pipeline is communicated with the fourth grade fluorite sub- concentrate collecting device, one end of the twelfth pipeline is communicated with the third gradient high-intensity magnetic separator, and the other end of the twelfth pipeline is communicated with the fifth grade fluorite concentrate collecting device, and the third gradient high-intensity magnetic separator is a 5T high-gradient superconducting magnetic separator.

10. The magnetic separation apparatus for upgrading the grade of a fluorite concentrate according to claim 9, characterized in that: The first grade fluorite concentrate is a fluorite concentrate with a grade of 82%-83%, the second grade fluorite concentrate is a fluorite concentrate with a grade of 85%-86%, the third grade fluorite concentrate is a fluorite concentrate with a grade of 88%, the fourth grade fluorite sub-concentrate is a fluorite concentrate with a grade of 80%, and the fifth grade fluorite concentrate is a fluorite concentrate with a grade of 95%. The first grade fluorite concentrate is a fluorite concentrate with a grade of 82%-83%, the second grade fluorite concentrate is a fluorite concentrate with a grade of 85%-86%, the third grade fluorite concentrate is a fluorite concentrate with a grade of 88%, the fourth grade fluorite sub-concentrate is a fluorite concentrate with a grade of 80%, and the fifth grade fluorite concentrate is a fluorite concentrate with a grade of 95%.

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