A magnetite rapid development, mining and beneficiation integrated multi-stage tailing discarding device and its tailing discarding process

Abstract

The present invention discloses a magnetite rapid development and beneficiation combined multi-stage tailing discarding device and its tailing discarding process, belonging to the technical field of beneficiation processes. The present invention includes a first bar feeder and a second bar feeder. The over-screen output end of the first bar feeder is provided with a first jaw crusher. The output end of the first jaw crusher is provided with a first primary dry magnetic separator. The output end of the first primary dry magnetic separator is provided with a first circular vibrating screen and a first medium crushing cone crusher. The output end of the first medium crushing cone crusher is provided with a first secondary dry magnetic separator. The present invention can accelerate the development speed of open-pit magnetite mines, improve the comprehensive utilization rate of mine resources, improve the grade of the raw ore to be selected through magnetic tailing discarding, reduce the transportation volume, lower the beneficiation cost, relieve the inventory pressure of the tailing pond, and the closed belt conveying system can effectively reduce dust, with better environmental protection effect; crushing and classifying the surrounding rock as building materials for sale can improve the resource utilization rate and comprehensive benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of ore dressing processes, and more specifically, to a combined multi-stage tailing discarding device for rapid development of magnetite mining and beneficiation and its tailing discarding process. Background Art

[0002] Open-pit iron ore is a very important form of iron ore resources. In recent years, due to the increasing demand for iron ore resources in industrial production, the exploitable life of mines under the new policy is also constantly shortening. This requires a rapid development method to enable enterprises to efficiently extract most of the ore resources within a limited time period. Most of the open-pit iron ore mines in China directly transport the mined raw ore to a beneficiation plant several kilometers away by electric locomotives for processing, and the iron-bearing surrounding rock is discharged as tailings to the waste dump. This method cannot effectively improve the stope development speed and also causes waste of resources.

[0003] At the same time, in many mines, the ore and rock are interlaced and the ore-rock boundary is not obvious. It is very difficult to completely separate the ore from the low-grade iron-bearing surrounding rock during the mining process. If a large amount of low-grade ore is directly mixed with industrial-grade ore and enters the beneficiation plant for production, it will lower the feed grade of the concentrator, increase the transportation and beneficiation costs, and a large amount of tailings entering the tailings pond will increase the storage capacity pressure. The surrounding rock that can be sold as building materials is not well utilized, resulting in waste of resources. Therefore, adopting the combined multi-stage tailing discarding process to pre-treat the raw ore in the stope can effectively improve the feed grade of the concentrator, reduce production costs. At the same time, the magnetic separation tailing discarding product can be sold as building materials, improving the comprehensive utilization rate of resources and enhancing the enterprise benefits. Summary of the Invention

[0004] 1. Technical Problems to be Solved by the Invention

[0005] Aiming at the defects and deficiencies existing in the prior art, the present invention provides a combined multi-stage tailing discarding device for rapid development of magnetite mining and beneficiation and its tailing discarding process. The invention is applicable to open-pit magnetite with a large transportation distance, interlaced ore and rock, and an unclear ore-rock boundary. It can accelerate the stope development speed of open-pit magnetite, improve the comprehensive utilization rate of mine resources, pre-treat the raw ore in the stope and the iron-bearing surrounding rock in the stope, and improve the feed grade of the raw ore to be selected, reduce the transportation volume, lower the beneficiation cost, and relieve the inventory pressure of the tailings pond through magnetic separation tailing discarding.

[0006] 2. Technical Solutions

[0007] To achieve the above object, the technical solutions provided by the present invention are as follows:

[0008] A combined multi-stage tailing discarding device for rapid development, mining and beneficiation of magnetite of the present invention includes a first bar feeder and a second bar feeder. A first jaw crusher is arranged at the oversize output end of the first bar feeder. An No. 1 primary dry magnetic separator is arranged at the output end of the first jaw crusher. A first circular vibrating screen is arranged at the output end of the No. 1 primary dry magnetic separator. A first medium crushing cone crusher is arranged at the oversize output end of the first circular vibrating screen. An No. 1 secondary dry magnetic separator is arranged at the output end of the first medium crushing cone crusher. A long-distance belt conveyor and a double-deck vibrating screen are respectively arranged at the output end of the No. 1 secondary dry magnetic separator. The concentrate magnetically separated by the No. 1 secondary dry magnetic separator is conveyed to the double-deck vibrating screen through the long-distance belt conveyor.

[0009] The first bar feeder and the second bar feeder are arranged in parallel. A second jaw crusher is arranged at the oversize output end of the second bar feeder. An No. 2 primary dry magnetic separator is arranged at the output end of the second jaw crusher. A second circular vibrating screen is arranged at the output end of the No. 2 primary dry magnetic separator. A second medium crushing cone crusher is arranged at the oversize output end of the second circular vibrating screen. An No. 2 secondary dry magnetic separator is arranged at the output end of the second medium crushing cone crusher. A long-distance belt conveyor and a double-deck vibrating screen are respectively arranged at the output end of the No. 2 secondary dry magnetic separator. The concentrate magnetically separated by the No. 2 secondary dry magnetic separator is conveyed to the double-deck vibrating screen through the long-distance belt conveyor. A fine crushing cone crusher is arranged at the oversize output end of the double-deck vibrating screen. A tertiary dry magnetic separator is arranged at the undersize output end of the double-deck vibrating screen.

[0010] Further, the undersize output end of the first bar feeder outputs to the inside of the No. 1 primary dry magnetic separator, and the undersize output end of the first circular vibrating screen outputs to the inside of the No. 1 secondary dry magnetic separator.

[0011] Further, ore is input into the input end of the first bar feeder, and iron-bearing wall rock is input into the input end of the second bar feeder. The first bar feeder, the first jaw crusher, the No. 1 primary dry magnetic separator, the first circular vibrating screen, the first medium crushing cone crusher and the No. 1 secondary dry magnetic separator form an ore treatment system, and the second bar feeder, the second jaw crusher, the No. 2 primary dry magnetic separator, the second circular vibrating screen, the second medium crushing cone crusher and the No. 2 secondary dry magnetic separator form an iron-bearing wall rock treatment system.

[0012] Further, the undersize output end of the second bar feeder outputs to the inside of the No. 2 primary dry magnetic separator, and the undersize output end of the second circular vibrating screen outputs to the inside of the No. 2 secondary dry magnetic separator.

[0013] Further, the concentrate selected by the first primary dry magnetic separator is fed into the first circular vibrating screen, and the concentrate selected by the second primary dry magnetic separator is fed into the second circular vibrating screen. The tailings selected by the first and second primary dry magnetic separators are large blocky stones, and the tailings selected by the first and second secondary dry magnetic separators are small blocky stones.

[0014] Further, the tailings selected by the tertiary dry magnetic separator are flake stones, and the concentrate selected by the tertiary dry magnetic separator enters the subsequent process.

[0015] A tailing process for a rapid development, mining and dressing integrated multi-stage tailing discarding device for magnetite, the steps of which are as follows:

[0016] Step 1: Arrange two sets of identical coarse and medium crushing pre-tailing discarding systems on opposite sides within the stope boundary, which are divided into an ore treatment system and an iron-bearing surrounding rock treatment system;

[0017] Step 2: The stope is developed from two directions, and the ore is transported to the ore treatment system by mining trucks respectively, and the iron-bearing surrounding rock is transported to the iron-bearing surrounding rock treatment system;

[0018] Step 3: After the ore is transported to the ore treatment system, it undergoes a pre-screening operation through the first grizzly feeder. The materials with a particle size of +300 mm on the screen enter the first jaw crusher for crushing operation. After crushing, the materials are combined with the materials with a particle size of 0 - 300 mm under the screen and enter the first primary dry magnetic separator for magnetic separation operation. The magnetic separation tailings are transported to the yard for sale as large blocky stones. The magnetic separation concentrate is transported to the first circular vibrating screen for pre-screening operation. The materials with a particle size of +70 mm on the screen enter the first medium crushing cone crusher for crushing operation. After crushing, the materials are combined with the materials with a particle size of 0 - 70 mm under the screen and enter the first secondary dry magnetic separator for magnetic separation operation. The magnetic separation tailings are transported to the yard for sale as small blocky stones. The magnetic separation concentrate is transported to the long-distance belt conveyor;

[0019] Step 4: After the iron-bearing surrounding rock is transported to the iron-bearing surrounding rock treatment system, it undergoes a pre-screening operation through the second grizzly feeder. The materials with a particle size of +300 mm on the screen enter the second jaw crusher for crushing operation. After crushing, the materials are combined with the materials with a particle size of 0 - 300 mm under the screen and enter the second primary dry magnetic separator for magnetic separation operation. The magnetic separation tailings are transported to the yard for sale as large blocky stones. The magnetic separation concentrate is transported to the second circular vibrating screen for pre-screening operation. The materials with a particle size of +70 mm on the screen enter the second medium crushing cone crusher for crushing operation. After crushing, the materials are combined with the materials with a particle size of 0 - 70 mm under the screen and enter the second secondary dry magnetic separator for magnetic separation operation. The magnetic separation tailings are transported to the yard for sale as small blocky stones. The magnetic separation concentrate is transported to the long-distance belt conveyor;

[0020] Step 5: The concentrates after the ore and iron-bearing surrounding rock are respectively subjected to magnetic separation operations by the first secondary dry magnetic separator and the second secondary dry magnetic separator are merged as raw ore and transported to the concentrator through a long-distance belt conveyor;

[0021] Step 6: After the raw ore enters the concentrator, it first enters a double-deck vibrating screen for pre-screening operation. The materials with a particle size of +16 mm on the screen are fed into a fine crushing cone crusher for closed-circuit crushing operation. The materials with a particle size of 0-16 mm under the screen are fed into a tertiary dry magnetic separator for magnetic separation operation. The magnetic separation tailings are transported to the stockyard for sale as crushed stones, and the magnetic separation concentrates are transported to the subsequent process for processing.

[0022] Further, the particle size of the large crushed stones is 0-300 mm, the particle size of the small crushed stones is 0-70 mm, and the particle size of the crushed stones is 0-16 mm.

[0023] Further, the ore treatment system and the iron-bearing surrounding rock treatment system can be mutually converted when the ore and rock parts in the stope change.

[0024] 3. Beneficial effects

[0025] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0026] The present invention is applicable to open-pit magnetite with a large haulage distance, interlaced ore and rock, and an unclear ore-rock boundary. It can accelerate the development speed of the open-pit magnetite stope, improve the comprehensive utilization rate of mine resources, pre-treat the raw ore and iron-bearing surrounding rock in the stope, improve the grade of the raw ore to be selected by magnetic separation tailing discharge, reduce the transportation volume, reduce the beneficiation cost, and relieve the inventory pressure of the tailing pond; use a long-distance belt conveyor to transport the pretreated ore, and continuous production can be achieved compared with the intermittent transportation method of electric locomotives, reducing the intermediate links in production organization and improving the operation efficiency; the closed belt conveying system can effectively reduce dust, and the environmental protection effect is better; crushing and classifying the surrounding rock as building materials for sale improves the resource utilization rate and comprehensive benefits. Brief description of the drawings

[0027] Figure 1 It is the process flow chart of the present invention.

[0028] In the figure: 1. First grizzly feeder; 2. Second grizzly feeder; 3. First jaw crusher; 4. Second jaw crusher; 5. First primary dry magnetic separator; 6. Second primary dry magnetic separator; 7. First circular vibrating screen; 8. Second circular vibrating screen; 9. First intermediate crushing cone crusher; 10. Second intermediate crushing cone crusher; 11. First secondary dry magnetic separator; 12. Second secondary dry magnetic separator; 13. Long-distance belt conveyor; 14. Double-deck vibrating screen; 15. Fine crushing cone crusher; 16. Tertiary dry magnetic separator. Detailed implementation manners

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0030] Embodiment 1

[0031] From Figure 1 It can be seen that a rapid development, mining, dressing and combined multi-stage tailing discarding device for magnetite in this embodiment includes a first bar feeder 1 and a second bar feeder 2. A first jaw crusher 3 is arranged at the oversize output end of the first bar feeder 1. A first primary dry magnetic separator 5 is arranged at the output end of the first jaw crusher 3. A first circular vibrating screen 7 is arranged at the output end of the first primary dry magnetic separator 5. A first intermediate crushing cone crusher 9 is arranged at the oversize output end of the first circular vibrating screen 7. A second primary dry magnetic separator 11 is arranged at the output end of the first intermediate crushing cone crusher 9. A long-distance belt conveyor 13 and a double-deck vibrating screen 14 are respectively arranged at the output end of the second primary dry magnetic separator 11. The concentrate magnetically separated by the second primary dry magnetic separator 11 is conveyed to the double-deck vibrating screen 14 through the long-distance belt conveyor 13.

[0032] The first bar feeder 1 and the second bar feeder 2 are arranged in parallel. A second jaw crusher 4 is arranged at the oversize output end of the second bar feeder 2. A second primary dry magnetic separator 6 is arranged at the output end of the second jaw crusher 4. A second circular vibrating screen 8 is arranged at the output end of the second primary dry magnetic separator 6. A second intermediate crushing cone crusher 10 is arranged at the oversize output end of the second circular vibrating screen 8. A second secondary dry magnetic separator 12 is arranged at the output end of the second intermediate crushing cone crusher 10. A long-distance belt conveyor 13 and a double-deck vibrating screen 14 are respectively arranged at the output end of the second secondary dry magnetic separator 12. The concentrate magnetically separated by the second secondary dry magnetic separator 12 is conveyed to the double-deck vibrating screen 14 through the long-distance belt conveyor 13. A fine crushing cone crusher 15 is arranged at the oversize output end of the double-deck vibrating screen 14. A third dry magnetic separator 16 is arranged at the undersize output end of the double-deck vibrating screen 14.

[0033] Minerals are conveyed from the stope to the concentrator through the long-distance belt conveyor 13. Compared with the discontinuous transportation mode of the electric locomotive, continuous production can be achieved, the intermediate links in production organization can be reduced, and the operation efficiency can be improved; at the same time, the belt transportation system has a lower cost than the electric locomotive transportation, and can effectively reduce the transportation cost; the closed belt transportation system can effectively reduce dust, and has better environmental protection effect.

[0034] The undersize output end of the first bar feeder 1 outputs to the inside of the first primary dry magnetic separator 5, and the undersize output end of the first circular vibrating screen 7 outputs to the inside of the second primary dry magnetic separator 11.

[0035] The undersize output end of the second bar feeder 2 outputs to the inside of the second primary dry magnetic separator 6, and the undersize output end of the second circular vibrating screen 8 outputs to the inside of the second secondary dry magnetic separator 12.

[0036] Ore is input into the input end of the first bar feeder 1, and iron-bearing wall rock is input into the input end of the second bar feeder 2. The first bar feeder 1, the first jaw crusher 3, the first primary dry magnetic separator 5, the first circular vibrating screen 7, the first intermediate crushing cone crusher 9, and the first secondary dry magnetic separator 11 form an ore processing system, and the second bar feeder 2, the second jaw crusher 4, the second primary dry magnetic separator 6, the second circular vibrating screen 8, the second intermediate crushing cone crusher 10, and the second secondary dry magnetic separator 12 form an iron-bearing wall rock processing system.

[0037] The concentrate selected by the first primary dry magnetic separator 5 is input into the first circular vibrating screen 7, and the concentrate selected by the second primary dry magnetic separator 6 is input into the second circular vibrating screen 8. The tailings selected by the first primary dry magnetic separator 5 and the second primary dry magnetic separator 6 are large block stones, and the tailings selected by the first secondary dry magnetic separator 11 and the second secondary dry magnetic separator 12 are small block stones.

[0038] The tailings selected by the tertiary dry magnetic separator 16 are melon seeds-shaped pieces, and the concentrate selected by the tertiary dry magnetic separator 16 enters the subsequent process.

[0039] A tailing discarding process of a rapid development, mining, and beneficiation combined multi-stage tailing discarding device for magnetite, the steps of which are as follows:

[0040] Step 1: Arrange two sets of identical coarse and intermediate crushing pre-tailing discarding systems on opposite sides within the stope boundary, which are divided into two systems: an ore processing system and an iron-bearing wall rock processing system;

[0041] Step 2: The stope is developed from two directions, and ore trucks are used to transport ore to the ore processing system and iron-bearing wall rock to the iron-bearing wall rock processing system respectively;

[0042] Step 3: After the ore is transported to the ore processing system, it undergoes a pre-screening operation through the first bar feeder 1. The +300 mm particle size material on the screen enters the first jaw crusher 3 for crushing operation. After crushing, the material is combined with the 0 - 300 mm particle size material under the screen and enters the first primary dry magnetic separator 5 for magnetic separation operation. The magnetic separation tailings are transported to the yard for sale as large block stones. The magnetic separation concentrate is transported to the first circular vibrating screen 7 for pre-screening operation. The +70 mm particle size material on the screen enters the first intermediate crushing cone crusher 9 for crushing operation. After crushing, the material is combined with the 0 - 70 mm particle size material under the screen and enters the first secondary dry magnetic separator 11 for magnetic separation operation. The magnetic separation tailings are transported to the yard for sale as small block stones. The magnetic separation concentrate is transported onto the long-distance belt conveyor 13;

[0043] Step 4: After the iron-bearing surrounding rock is transported to the iron-bearing surrounding rock treatment system, it undergoes a pre-screening operation through the second grizzly feeder 2. The oversize +300 mm sized materials enter the second jaw crusher 4 for crushing. After crushing, the materials are combined with the undersize 0-300 mm sized materials and enter the No. 2 primary dry magnetic separator 6 for magnetic separation. The magnetic separation tailings are transported to the yard for sale as large block stones. The magnetic separation concentrate is transported to the second circular vibrating screen 8 for pre-screening. The oversize +70 mm sized materials enter the second intermediate crushing cone crusher 10 for crushing. After crushing, the materials are combined with the undersize 0-70 mm sized materials and enter the No. 2 secondary dry magnetic separator 12 for magnetic separation. The magnetic separation tailings are transported to the yard for sale as small block stones. The magnetic separation concentrate is transported onto the long-distance belt conveyor 13;

[0044] Step 5: The concentrates after magnetic separation of the ore and the iron-bearing surrounding rock through the No. 1 secondary dry magnetic separator 11 and the No. 2 secondary dry magnetic separator 12 respectively are combined as raw ore and transported to the concentrator through the long-distance belt conveyor 13;

[0045] Step 6: After the raw ore enters the concentrator, it first enters the double-deck vibrating screen 14 for pre-screening. The oversize +16 mm sized materials enter the fine crushing cone crusher 15 for closed-circuit crushing. The undersize 0-16 mm sized materials enter the third dry magnetic separator 16 for magnetic separation. The magnetic separation tailings are transported to the yard for sale as pea gravel. The magnetic separation concentrate is transported to the subsequent process for processing.

[0046] The particle size of the large block stones is 0-300 mm, the particle size of the small block stones is 0-70 mm, and the particle size of the pea gravel is 0-16 mm. The ore treatment system and the iron-bearing surrounding rock treatment system can be mutually converted when the ore and rock parts in the stope change.

[0047] By simultaneously developing from two directions in the stope, the present invention can effectively improve the development speed, and at the same time can effectively shorten the transportation distance and improve the efficiency. When the ore and rock parts change, they can be switched with each other to improve the stope development speed.

[0048] The present invention adopts a three-stage magnetic separation and tailing discarding process of rough, intermediate and fine stages. For a stope with interlaced ore and rock and unclear ore and rock boundaries, the industrial-grade ore and low-grade iron-bearing surrounding rock can be mixed and input into the system to improve the mining efficiency. After multi-stage magnetic separation operations, the magnetic separation concentrate is used as the raw ore for beneficiation, which improves the grade of the raw ore for beneficiation, can reduce the beneficiation cost and the pressure on the tailings pond capacity; reduce the material transportation volume and transportation cost. The magnetic separation tailings produce three building material products of large block stones, small block stones and pea gravel, which improves the comprehensive utilization efficiency of resources and increases the enterprise benefits. The adoption of a three-stage one-closed-circuit crushing of rough-intermediate-fine crushing can ensure the qualified crushing particle size. Before the rough, intermediate and fine crushing operations, corresponding equipment is used for pre-screening operations, which can effectively improve the crushing operation efficiency, reduce the equipment load and equipment loss.

[0049] The present invention is applicable to open-pit magnetite mines with large haulage distances, interlaced ore and rock, and indistinct ore-rock boundaries. It can accelerate the development speed of the open-pit magnetite stope, improve the comprehensive utilization rate of mine resources, pre-treat the raw ore and iron-bearing surrounding rock in the stope, improve the grade of the raw ore to be selected by magnetic separation tailing rejection, reduce the transportation volume, lower the beneficiation cost, and relieve the inventory pressure of the tailings pond; use the long-distance belt conveyor 13 to transport the pre-treated ore, and continuous production can be achieved compared with the intermittent transportation mode of the electric locomotive, reducing the intermediate links in production organization and improving the operation efficiency; the closed belt conveying system can effectively reduce dust, and the environmental protection effect is better; crushing and classifying the surrounding rock for building materials sales can improve the resource utilization rate and comprehensive benefits.

[0050] The above has schematically described the present invention and its implementation manners. This description is not restrictive, and only one of the implementation manners of the present invention is shown in the drawings. The actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments to this technical solution without creative work without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A rapid development, mining and dressing integrated multi-stage tailing discarding device for magnetite, comprising a first bar feeder (1) and a second bar feeder (2), characterized in that: The screen upper output end of the described first bar feeder (1) is provided with a first jaw crusher (3), the output end of the first jaw crusher (3) is provided with a first primary dry magnetic separator (5), the output end of the first primary dry magnetic separator (5) is provided with a first circular vibrating screen (7), the screen upper output end of the first circular vibrating screen (7) is provided with a first medium crushing cone crusher (9), the output end of the first medium crushing cone crusher (9) is provided with a second primary dry magnetic separator (11), and the output end of the second primary dry magnetic separator (11) is respectively provided with a long-distance belt conveyor (13) and a double-deck vibrating screen (14). The concentrate magnetically separated by the second primary dry magnetic separator (11) is conveyed to the double-deck vibrating screen (14) through the long-distance belt conveyor (13). The described first bar feeder (1) and the second bar feeder (2) are arranged in parallel. The screen upper output end of the second bar feeder (2) is provided with a second jaw crusher (4), the output end of the second jaw crusher (4) is provided with a second primary dry magnetic separator (6), the output end of the second primary dry magnetic separator (6) is provided with a second circular vibrating screen (8), the screen upper output end of the second circular vibrating screen (8) is provided with a second medium crushing cone crusher (10), the output end of the second medium crushing cone crusher (10) is provided with a second secondary dry magnetic separator (12), and the output end of the second secondary dry magnetic separator (12) is respectively provided with a long-distance belt conveyor (13) and a double-deck vibrating screen (14). The concentrate magnetically separated by the second secondary dry magnetic separator (12) is conveyed to the double-deck vibrating screen (14) through the long-distance belt conveyor (13). The screen upper output end of the described double-deck vibrating screen (14) is provided with a fine crushing cone crusher (15), and the screen lower output end of the double-deck vibrating screen (14) is provided with a third dry magnetic separator (16). Ores are input into the input end of the described first bar feeder (1), and iron-bearing surrounding rocks are input into the input end of the second bar feeder (2). The first bar feeder (1), the first jaw crusher (3), the first primary dry magnetic separator (5), the first circular vibrating screen (7), the first medium crushing cone crusher (9), and the second primary dry magnetic separator (11) form an ore processing system, and the second bar feeder (2), the second jaw crusher (4), the second primary dry magnetic separator (6), the second circular vibrating screen (8), the second medium crushing cone crusher (10), and the second secondary dry magnetic separator (12) form an iron-bearing surrounding rock processing system. The screen lower output end of the first bar feeder (1) outputs into the first primary dry magnetic separator (5), and the screen lower output end of the first circular vibrating screen (7) outputs into the second primary dry magnetic separator (11).

2. A combined multi-stage tailing discarding device for rapid development and mining and beneficiation of magnetite according to claim 1, characterized in that: The screen lower output end of the second bar feeder (2) outputs into the second primary dry magnetic separator (6), and the screen lower output end of the second circular vibrating screen (8) outputs into the second secondary dry magnetic separator (12).

3. A combined multi-stage tailing discarding device for rapid development and mining and dressing of magnetite according to claim 1, characterized in that: The concentrate selected by the first primary dry magnetic separator (5) is fed into the first circular vibrating screen (7), and the concentrate selected by the second primary dry magnetic separator (6) is fed into the second circular vibrating screen (8). The tailings selected by the first primary dry magnetic separator (5) and the second primary dry magnetic separator (6) are large blocky stones, and the tailings selected by the first secondary dry magnetic separator (11) and the second secondary dry magnetic separator (12) are small blocky stones.

4. A combined multi-stage tailing discarding device for rapid development of magnetite mining and beneficiation according to claim 1, characterized in that: The tailings selected by the tertiary dry magnetic separator (16) are flake stones, and the concentrate selected by the tertiary dry magnetic separator (16) enters the subsequent process.

5. The tailing rejection process of a combined multi-stage tailing rejection device for rapid development of magnetite mining and beneficiation according to claim 1, characterized in that: The steps are as follows: Step 1: Arrange two sets of identical coarse and medium crushing pre-tailing rejection systems on opposite sides within the stope boundary, which are divided into an ore treatment system and an iron-bearing surrounding rock treatment system; Step 2: The stope is developed from two directions, and the ore is transported to the ore treatment system by mining trucks respectively, and the iron-bearing surrounding rock is transported to the iron-bearing surrounding rock treatment system; Step 3: After the ore is transported to the ore treatment system, it undergoes a pre-screening operation through the first grizzly feeder (1). The +300 mm sized material on the screen enters the first jaw crusher (3) for crushing. After crushing, the material is combined with the 0-300 mm sized material under the screen and enters the first primary dry magnetic separator (5) for magnetic separation. The magnetic separation tailings are transported to the yard for sale as large blocky stones. The magnetic separation concentrate is transported to the first circular vibrating screen (7) for pre-screening. The +70 mm sized material on the screen enters the first medium crushing cone crusher (9) for crushing. After crushing, the material is combined with the 0-70 mm sized material under the screen and enters the first secondary dry magnetic separator (11) for magnetic separation. The magnetic separation tailings are transported to the yard for sale as small blocky stones. The magnetic separation concentrate is transported onto the long-distance belt conveyor (13); Step 4: After the iron-bearing surrounding rock is transported to the iron-bearing surrounding rock treatment system, it undergoes a pre-screening operation through the second grizzly feeder (2). The +300 mm sized material on the screen enters the second jaw crusher (4) for crushing. After crushing, the material is combined with the 0-300 mm sized material under the screen and enters the second primary dry magnetic separator (6) for magnetic separation. The magnetic separation tailings are transported to the yard for sale as large blocky stones. The magnetic separation concentrate is transported to the second circular vibrating screen (8) for pre-screening. The +70 mm sized material on the screen enters the second medium crushing cone crusher (10) for crushing. After crushing, the material is combined with the 0-70 mm sized material under the screen and enters the second secondary dry magnetic separator (12) for magnetic separation. The magnetic separation tailings are transported to the yard for sale as small blocky stones. The magnetic separation concentrate is transported onto the long-distance belt conveyor (13); Step 5: The concentrates after magnetic separation of the ore and the iron-bearing surrounding rock through the first secondary dry magnetic separator (11) and the second secondary dry magnetic separator (12) respectively are combined as raw ore and transported to the concentrator through the long-distance belt conveyor (13); Step 6: After the raw ore enters the concentrator, it first enters the double-deck vibrating screen (14) for pre-screening operation. The materials with a particle size of +16 mm on the screen enter the fine crushing cone crusher (15) for closed-circuit crushing operation. The materials with a particle size of 0-16 mm under the screen enter the three-stage dry magnetic separator (16) for magnetic separation operation. The magnetic separation tailings are transported to the storage yard for sale as melon seeds, and the magnetic separation concentrate is transported to the subsequent process for processing.

6. The tailing discarding process of a magnetite rapid development, mining and dressing integrated multi-stage tailing discarding device according to claim 5, characterized in that: The ore processing system and the iron-bearing surrounding rock processing system can be converted into each other when the ore-rock part in the stope changes.

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