CN112958269B

CN112958269B - Sand ilmenite tailing separation system and treatment process

Info

Publication number: CN112958269B
Application number: CN202110313824.4A
Authority: CN
Inventors: 李继文
Original assignee: Wuding Zeyuan Mining Co ltd
Current assignee: Wuding Zeyuan Mining Co ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2022-12-16
Anticipated expiration: 2041-03-24
Also published as: CN112958269A

Abstract

The invention relates to the technical field of ore dressing, in particular to a sand ilmenite tailing dressing system and a treatment process. Including the pond, the outside in pond is equipped with the mixing tank, and the rear end outside in mixing tank is equipped with the ball mill, and the rear end outside of ball mill is equipped with gravity screw machine, and one side of gravity screw machine is equipped with the filter-tank outward, and the lower extreme of gravity screw machine is equipped with the concentrated tank outward, is equipped with the mud groove under the concentrated tank, and the rear end outside in mud groove is equipped with the chamber filter press, and the outside of chamber filter press is equipped with screw compressor machine. The design of the invention can realize grading, reselection and grading concentration of the ore pulp, effectively recycle the tail water in each process, save resources and energy consumption, realize wet-separation and dry-stacking of the tailings, simultaneously ensure that the filtrate is clear and can be continuously recycled, meet the policy requirements of national emergency departments on reducing and not increasing the tailings ponds and protecting the environment, be environment-friendly and ecological, have low treatment cost, and further save the capital for safety and ecological treatment, energy conservation and emission reduction and the maintenance cost of the tailings ponds.

Description

Sand ilmenite tailing separation system and treatment process

Technical Field

The invention relates to the technical field of ore dressing, in particular to a sand ilmenite tailing dressing system and a treatment process.

Background

Titanium is a silvery white metal, and the titanium ores are of a wide variety, and rutile and ilmenite are mainly used in the current industry. In the traditional mineral processing process flow commonly adopted at home and abroad at present, the problems of high energy consumption, more water, difficult recovery of most of particulate minerals in ore pulp, large ore grinding amount, low recovery efficiency (about 60%), land occupation by tailings, generation of polluting wastewater by flotation and the like exist. Meanwhile, a thickener and a plate-frame filter press which are adopted in the traditional tailing filter pressing have large occupied area, poor precipitation effect and the need of adding medicaments, so that the energy consumption is high, the production cost is high, the production time is long, mine resources cannot be fully utilized (the ore content in the traditional process is higher than 6 percent and has mining value), and the problem that reuse water cannot be completely recycled exists.

The sand-coated ilmenite tail separation system and the treatment process can realize better comprehensive utilization of resources, and can completely recycle low-grade raw ores and waste ores (the ore content can be produced by more than 3%). The occupied area of the equipment is small, and the equipment basically realizes automatic control by adopting a DCS (distributed control system). The recovery rate is high (about 75%), no medicament is needed to be added in the treatment process, the production water can be recycled by 100%, the environment is not polluted, and a tailing pond is not needed to be built for dry stacking. The tailings can be recycled by 100 percent (used for brick firing in nearby brick factories and greening and recovering the soil for treatment in nearby mined-out areas of mines). The method meets the requirements of national industrial policies, realizes the comprehensive utilization of resources, and effectively controls the safety and environmental protection. Low production cost and high recovery rate, and can realize larger economic benefit.

Disclosure of Invention

The invention aims to provide a sand ilmenite tailing separation system and a treatment process, which aim to solve the problems in the background technology.

In order to solve the technical problems, one of the purposes of the present invention is to provide a sand ilmenite tailing separation system, which comprises a water tank, wherein a mixing tank is arranged outside the water tank, a ball mill is arranged outside the rear end of the mixing tank, a gravity screw machine is arranged outside the rear end of the ball mill, a filter tank is arranged outside one side of the gravity screw machine, a concentration tank is arranged outside the lower end of the gravity screw machine, a slurry tank is arranged under the concentration tank, a chamber filter press is arranged outside the rear end of the slurry tank, and a screw air compressor is assembled outside the chamber filter press.

As a further improvement of the technical scheme, a water pump is arranged on one side of the water tank, a water supply pipe is connected to the water pump, and one end, far away from the water tank, of the water supply pipe is communicated into the mixing tank.

As a further improvement of the technical scheme, a plurality of spiral stirring rods are rotatably connected in the mixing tank, a discharging chute is fixedly welded at the rear end of the mixing tank, and the bottom end of the discharging chute extends to the feeding port of the ball mill.

As a further improvement of the technical scheme, top one side of gravity screw machine is equipped with the feeder hopper, the feeder hopper is located the discharge gate below department of ball mill, the bottom of gravity screw machine is equipped with ejection of compact side pipe, the bottom of gravity screw machine still is equipped with the filtrate pipe, the filtrate pipe is kept away from the one end of gravity screw machine communicates in the filter-tank, the middle department welded fastening of filtrate pipe has the filtrating branch pipe, the filtrating branch pipe is kept away from the one end of filtrate pipe extends to the feed inlet department of ball mill.

As a further improvement of the technical scheme, one end of the filter tank, which is far away from the filtrate pipe, is provided with a circulating pipe, and one end of the circulating pipe, which is far away from the filter tank, extends to the position above the feed hopper.

As the further improvement of this technical scheme, the concentrator tank includes the separating tank, welded fastening has the feeding pipe chute on the outer wall of one side of separating tank, the top mouth of pipe of feeding pipe chute is located department under ejection of compact side's pipe, welded fastening has the clear water drain pipe on the opposite side outer wall of separating tank, the clear water drain pipe is kept away from the one end of concentrator tank communicates in the pond, the orificial level in feeding pipe chute bottom is less than the level of clear water drain pipe entrance point, the bottom welded fastening of separating tank has the back taper subsider, the bottom welded fastening of back taper subsider has the end of a cone discharging pipe, one side of end of a cone discharging pipe is equipped with the back flush pipe, the inner of back flush pipe runs through extend to intraductal behind the lateral wall of end of a cone discharging pipe.

As a further improvement of the technical scheme, a stirring device is arranged in the middle of the slurry tank, a filter press delivery pump is arranged on one side of the slurry tank, a slurry pipe is connected to the filter press delivery pump, and one end, far away from the slurry tank, of the slurry pipe is communicated into the box type filter press.

As a further improvement of the technical scheme, a filtrate collecting tank is arranged on one side of the bottom end of the chamber type filter press, a water return pipe is connected to the bottom end of the filtrate collecting tank, and one end, far away from the chamber type filter press, of the water return pipe is communicated into the water pool.

The second purpose of the invention is to provide a sand ilmenite tail separation treatment process, which adopts any one sand ilmenite tail separation system and comprises the following steps:

s1, mixing placer and water according to a weight ratio of 1;

s2, transferring the ore pulp into a ball mill, and uniformly ball-milling for 20-30 min at a critical rotating speed of 76-78%;

s3, transferring the ball-milled ore pulp into a gravity screw machine, feeding the ore pulp with different particle sizes into different spiral chutes, and carrying out graded gravity separation for 10-30 min;

s4, in the grading and gravity separation process, part of filtrate discharged by the gravity screw machine is directly recycled into the ball mill, the other part of filtrate is discharged into a filter tank, and clear liquid obtained after filtering and precipitating in the filter tank is recycled into the gravity screw machine to wash the spiral chute;

s5, transferring the ore pulp subjected to grading and gravity separation into a concentration tank, wherein sludge in the ore pulp is automatically deposited downwards under the action of gravity, and then, overflowing clear liquid separated from the upper layer in the concentration tank is conveyed into a water return tank along a clear water discharge pipe;

s6, when the solid content of the sludge settled at the bottom of the thickening tank reaches more than 20%, the slurry can be discharged downwards into a slurry tank;

s7, continuously rotating the stirring device in the slurry tank to keep the slurry flowing and avoid slurry deposition and agglomeration;

s8, conveying the sludge in the sludge tank into a box type filter press through a filter press conveying pump, and providing driving force by a screw air compressor to push a filter plate to filter the sludge into a filter cake with the water content of 25% -30%;

s9, transporting the filter cake out of the dry stack through a loader, and meanwhile, discharging the press-filtered filtrate in a centralized manner and then returning the filtrate to the water tank through a return pipe.

As a further improvement of the technical scheme, in S3, ore pulp of different particle sizes enters different spiral chutes, specifically: coarse particles enter a 720-pitch plane spiral, medium particles enter a 640-pitch plane spiral, and fine particles enter a 640-pitch notch spiral.

Compared with the prior art, the invention has the beneficial effects that:

1. in the sand ilmenite tailing selecting system, the requirement of the process on the fineness of the ore pulp grain size is reduced, the ore grinding amount and the water consumption are reduced, the content of particles in the ore pulp is reduced, meanwhile, the ore pulp is subjected to graded reselection and graded concentration through gravity spiral, tail water in each process is effectively recycled, resources and energy consumption are saved, the pollution risk is reduced, and the problem that a large amount of micro powder is difficult to recycle due to the loss of the micro powder along with the tail water is solved;

2. in the sand ilmenite tailing selecting treatment process, by designing the process flow of mixing slurry, ball milling, gravity spiral, concentration and filter pressing, the tailing slurry has low water content, and dust, pollution, leakage and harmful chemical elements are not generated in the discharging process, so that the national environmental protection related standard is met, the filtrate is clear and can be continuously recycled, a large amount of water resources are saved, the tailing wet separation dry stack can be achieved, the occupied area and the environmental pollution are reduced, the tailing pond is reduced or even not required to be built, the requirement of the national emergency department on the policy that the tailing pond is only reduced or not increased is met, the environment and the ecology are protected, the potential safety hazard in the aspects of seepage prevention, flood prevention, pollution prevention and the like is avoided, the treatment cost is low, and further the safety and ecological treatment fund, the energy conservation and emission reduction and the maintenance cost of the tailing pond are saved.

Drawings

FIG. 1 is a schematic structural diagram of a tail selection system according to the present invention;

FIG. 2 is a block flow diagram of the treatment process of the present invention;

FIG. 3 is a flow chart of a method of the treatment process of the present invention.

In the figure:

1. a water pool; 11. a water pump; 12. a first water pipe;

2. a mixing tank; 21. a helical agitator shaft; 22. a discharge chute;

3. a ball mill;

4. a gravity screw machine; 41. a feed hopper; 42. discharging square tubes; 43. a filtrate pipe; 431. a filtrate branch pipe;

5. a filter tank; 51. a circulation pipe;

6. a slurry tank; 61. a separation tank; 611. a feeding inclined tube; 612. a clear water drain pipe; 62. an inverted cone settling tank; 63. a conical bottom discharge pipe; 631. a backwash pipe;

7. a slurry tank; 71. a stirring device; 72. a filter press delivery pump; 73. a mud pipe;

8. a chamber filter press; 81. a filtrate collecting tank; 82. a water return pipe;

9. a screw air compressor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

System embodiment

As shown in fig. 1, the purpose of this embodiment is to provide a sand ilmenite tail separation system, including pond 1, the outside of pond 1 is equipped with mixing tank 2, the rear end outside of mixing tank 2 is equipped with ball mill 3, the rear end outside of ball mill 3 is equipped with gravity screw machine 4, one side of gravity screw machine 4 is equipped with filter tank 5 outward, the lower extreme of gravity screw machine 4 is equipped with concentrator tank 6 outward, be equipped with mud groove 7 under concentrator tank 6, the rear end outside of mud groove 7 is equipped with chamber filter press 8, the outside of chamber filter press 8 is equipped with screw compressor 9.

In this embodiment, a water pump 11 is disposed on one side of the water tank 1, and a water supply pipe 12 is connected to the water pump 11.

Further, one end of the water supply pipe 12 extends into the water tank 1, and one end of the water supply pipe 12 away from the water tank 1 is communicated into the mixing tank 2, so that clean water is delivered into the mixing tank 2 through the water pump 11 and the water supply pipe 12.

In this embodiment, the mixing tank 2 is rotatably connected with a plurality of spiral stirring rods 21, and the outer ends of the spiral stirring rods 21 are driven by a motor.

Specifically, the placer and the clean water are mixed in the mixing tank 2 and stirred by the spiral stirring rod 21, so that the placer and the clean water are fully mixed to form slurry with uniform solid and liquid.

Further, the rear end welded fastening of mixing tank 2 has ejection of compact spout 22, and the bottom of ejection of compact spout 22 extends to the feed inlet department of ball mill 3, can directly carry mud in the ball mill 3 through ejection of compact spout 22, saves the trouble of transporting.

Further, the ball mill 3 is used for grinding and crushing large particles in the slurry, so that minerals wrapped by large-particle sludge blocks can be broken conveniently, the texture of the slurry is more uniform, the follow-up procedures can be performed conveniently, and the output of ore dressing can be improved.

In this embodiment, top one side of gravity screw machine 4 is equipped with feeder hopper 41, and feeder hopper 41 is located the discharge gate below department of ball mill 3, is convenient for directly carry the mud after the ball-milling 4 in the gravity screw machine, saves the trouble of transporting.

Further, the bottom end of the gravity screw machine 4 is provided with a discharging square pipe 42, and the gravity screw machine 4 is used for grading ore dressing of the ore in the slurry and respectively outputting the screened slurry through the discharging square pipe 42.

Specifically, in the operation process of the gravity screw machine 4, slurry enters different spiral chutes from the ore pulp feed hopper 41 due to different deposition speeds of minerals with different particle sizes, so that 'fractional concentration and fractional gravity separation' can be realized, and the recovery rate and the concentrate quality are improved.

Further, the bottom end of the gravity screw machine 4 is also provided with a filtrate pipe 43 for discharging filtrate removed in the process of spiral ore dressing.

Furthermore, one end of the filtrate pipe 43, which is far away from the gravity screw machine 4, is communicated into the filter tank 5, one end of the filter tank 5, which is far away from the filtrate pipe 43, is provided with a circulating pipe 51, and one end of the circulating pipe 51, which is far away from the clear liquid tank 53, extends to the upper part of the feed hopper 41, so that the filtrate can be conveniently filtered and precipitated for recycling.

Specifically, clear liquid is conveyed back to the gravity screw machine 4 by the circulating pipe 51, so that low concentration of slurry can be kept, classified screening is facilitated, a spiral chute in the gravity screw machine 4 can be washed, slurry retention and accumulation are reduced, and efficient operation of the gravity screw machine 4 is guaranteed.

Further, the middle of filtrate pipe 43 is fixed with filtrating branch pipe 431, and the one end that filtrating branch pipe 431 kept away from filtrate pipe 43 extends to the feed inlet department of ball mill 3, can reuse partial filtrating in ball mill 3, not only can filter the particle mineral that probably exists in the filtrating once more, also can wash 3 insides of ball mill, improves ball mill 3's ball-milling effect.

In this embodiment, the concentration tank 6 includes a separation tank 61, a feeding inclined tube 611 is welded and fixed on an outer wall of one side of the separation tank 61, and a top nozzle of the feeding inclined tube 611 is located right below the discharging square tube 42, so that the ore pulp screened by the gravity screw machine 4 can be directly conveyed into the concentration tank 6.

It should be noted that the number of the concentration tanks 6 is equal to the number of stages of the gravity screw machine 4 and the number of the discharge square pipes 42, and the concentration tanks are used for concentrating ore pulps with different thickness stages.

Furthermore, a clean water drain pipe 612 is fixedly welded on the outer wall of the other side of the separation tank 61, and one end of the clean water drain pipe 612, which is far away from the concentration tank 6, is communicated into the water tank 1, so that the concentrated and separated clean water can be directly conveyed back into the water tank 1 for recycling.

Specifically, the horizontal height of the pipe orifice at the bottom end of the feeding inclined pipe 611 is smaller than the horizontal height of the inlet end of the clear water drain pipe 612, so that slurry can directly settle to the bottom of the tank during feeding, pollution to upper-layer separated water in the feeding process is reduced, and the amount of slurry possibly carried in the separated water is reduced.

Furthermore, the bottom end of the separation tank 61 is fixedly welded with the inverted cone settling tank 62, so that the slurry can be settled conveniently, and the concentration effect is improved.

Further, back taper settling tank 62's bottom welded fastening has awl end discharging pipe 63, and one side of awl end discharging pipe 63 is equipped with backwash pipe 631, and the inner of backwash pipe 631 runs through and extends to intraductally behind the lateral wall of awl end discharging pipe 63, is convenient for discharge the mud after the concentration downwards, can carry out the back flush to the bottom of concentrator bowl 6 after backwash pipe 631 switch-on water source simultaneously, especially can play the effect of siphunculus when awl end discharging pipe 63 is blockked up.

In this embodiment, the middle of mud pit 7 is equipped with agitating unit 71, and agitating unit 71's driving motor passes through the backup pad and installs outside the top of mud pit 7, and agitating unit 71 can continue the stirring to mud, avoids mud to subside the caking, makes mud keep the texture even.

Furthermore, a filter press delivery pump 72 is arranged on one side of the slurry tank 7, a slurry pipe 73 is connected to the filter press delivery pump 72, one end of the slurry pipe 73, which is far away from the slurry tank 7, is communicated into the chamber filter press 8, and slurry can be delivered into the chamber filter press 8 through the filter press delivery pump 72 and the slurry pipe 73 for filter press dehydration operation.

In this embodiment, bottom one side of box filter press 8 is equipped with filtrating collecting vat 81, and the bottom of filtrating collecting vat 81 is connected with wet return 82, and wet return 82 is kept away from the one end of box filter press 8 and is communicated to pond 1 in, be convenient for collect the filtrating of pressure filtration and carry the filtrating in pond 1 so that the retrieval and utilization.

Further, screw air compressor 9 passes through the bolt fastening on the lateral wall of van-type pressure filter 8, provides the drive power of filter-pressing for van-type pressure filter 8 through screw air compressor 9, and its power is sufficient and stable, can effectively improve the filter-pressing effect.

In addition, a plurality of loaders are arranged outside the chamber filter press 8 for transporting the filter-pressed mud cakes outside in time.

Example of the Process

As shown in fig. 2 to fig. 3, the present embodiment aims to provide a sand ilmenite tailing separation treatment process, which includes the following steps:

s1, mixing placer and water according to a weight ratio of 1;

s2, transferring the ore pulp into a ball mill 3, and uniformly milling for 20-30 min at a critical rotating speed of 76-78%;

s3, transferring the ball-milled ore pulp into a gravity screw machine 4, feeding the ore pulp with different particle sizes into different spiral chutes, and performing graded gravity separation for 10-30 min;

s4, in the grading and gravity separation process, part of filtrate discharged by the gravity screw machine 4 is directly recycled into the ball mill 3, the other part of filtrate is discharged into the filter tank 5, and clear liquid obtained after filtering and precipitating in the filter tank 5 is recycled into the gravity screw machine 4 to flush the spiral chute;

s5, transferring the ore pulp subjected to grading and gravity separation into a concentration tank 6, automatically depositing sludge in the ore pulp downwards under the action of gravity, and conveying overflow clear liquid separated from the upper layer in the concentration tank back into the pool 1 along a clear water discharge pipe 612;

s6, when the solid content of the sludge settled at the bottom of the concentration tank 6 reaches more than 20%, the sludge can be discharged into the sludge tank 7 downwards;

s7, continuously rotating the stirring device 71 in the slurry tank 7 to keep the slurry flowing and avoid slurry deposition and agglomeration;

s8, conveying the sludge in the sludge tank 7 into the chamber type filter press 8 through a filter press conveying pump 72, and providing driving force by a screw air compressor 9 to push a filter plate to filter and press the slurry into a filter cake with the water content of 25% -30%;

s9, transporting the filter cake out of the dry pile through a loader, and meanwhile, discharging the filtrate which is subjected to pressure filtration in a centralized manner and then returning the filtrate to the water pool 1 through a water return pipe 82.

In this embodiment, in S3, the ore pulp of different granularities enters different spiral chutes, specifically: coarse particles enter a 720-pitch plane spiral, medium particles enter a 640-pitch plane spiral, and fine particles enter a 640-pitch notch spiral.

Wherein, the standard of coarse grains is preferably less than 60 meshes, the standard of medium grains is preferably 60 to 100 meshes, and the standard of fine grains is preferably more than or equal to 100 meshes.

Further, in step S3, harmful elements such as phosphorus, sulfur, calcium, magnesium, etc. may also be removed by physical means.

In this embodiment, in steps S5 to S6, the gap water of the sludge is mainly reduced in the slurry concentration process, the concentrated sludge is approximately pasty and still keeps fluidity, and the discharged sludge is sludge with a high solid content, so that the subsequent mechanical dehydration through a filter press is facilitated, and the improvement of the working efficiency and the dehydration effect of the filter press dehydration is facilitated.

In this embodiment, in step S8, the internal structure of the chamber filter press 8 is a filter chamber formed by arranging a plurality of filter plates, wherein pockmarks and bosses are provided on the surfaces of the filter plates for supporting filter cloth, through holes are provided in the centers and corners of the filter plates, and a completed filter passage is formed after assembly, and suspension, washing water, and filtrate can be introduced, and the filter plates are supported on a cross beam by handles on both sides of the filter plates, and the filter plates are compressed by a screw air compressor 9, and the filter cloth between the filter plates plays a role in sealing, thereby achieving a required pressure.

Further, under the pressure action of the filter press delivery pump 72, slurry is delivered into each filter chamber, solids and liquid are separated through the filter cloth, the slurry solids form filter residues on the filter cloth until the filter chambers are filled to form filter cakes, and filtrate passes through the filter cloth and flows to a liquid outlet channel below along the grooves of the filter plates to be discharged in a centralized manner.

And further, opening the filter press to remove the filter cake after the filter pressing is finished, cleaning the filter cloth, and then pressing the filter plate again for continuous use.

Particularly, the chamber filter press 8 has small floor area, high operation efficiency, good filter pressing effect, relatively durable filter cloth and lower use cost compared with the traditional thickener and plate and frame filter press.

The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A sand ilmenite tail separation system is characterized in that: the device comprises a water pool (1), wherein a mixing tank (2) is arranged on the outer side of the water pool (1), a ball mill (3) is arranged on the outer side of the rear end of the mixing tank (2), a gravity screw machine (4) is arranged on the outer side of the rear end of the ball mill (3), a filter tank (5) is arranged outside one side of the gravity screw machine (4), a concentration tank (6) is arranged outside the lower end of the gravity screw machine (4), a slurry tank (7) is arranged under the concentration tank (6), a box filter press (8) is arranged on the outer side of the rear end of the slurry tank (7), and a screw air compressor (9) is assembled on the outer side of the box filter press (8);

a feed hopper (41) is arranged on one side of the top end of the gravity screw machine (4), the feed hopper (41) is located below a discharge port of the ball mill (3), a discharge square pipe (42) is arranged at the bottom end of the gravity screw machine (4), a filtrate pipe (43) is further arranged at the bottom end of the gravity screw machine (4), one end, far away from the gravity screw machine (4), of the filtrate pipe (43) is communicated into the filter tank (5), a filtrate branch pipe (431) is fixedly welded in the middle of the filtrate pipe (43), and one end, far away from the filtrate pipe (43), of the filtrate branch pipe (431) extends to the feed port of the ball mill (3);

a circulating pipe (51) is arranged at one end of the filtering tank (5) far away from the filtrate pipe (43), and one end of the circulating pipe (51) far away from the filtering tank (5) extends to the position above the feed hopper (41);

concentrate groove (6) including separator tank (61), welded fastening has feeding pipe chute (611) on the one side outer wall of separator tank (61), the top mouth of pipe of feeding pipe chute (611) is located under ejection of compact side pipe (42), welded fastening has clear water drain pipe (612) on the opposite side outer wall of separator tank (61), clear water drain pipe (612) are kept away from the one end of concentrate groove (6) is communicated in pond (1), the orificial level in feeding pipe chute (611) bottom is less than the level of clear water drain pipe (612) entrance point, the bottom welded fastening of separator tank (61) has back taper settling tank (62), the bottom welded fastening of back taper settling tank (62) has end discharging pipe (63), one side of taper end discharging pipe (63) is equipped with back flushing pipe (631), the inner of back flushing pipe (631) runs through extend to intraductally behind the lateral wall of taper end discharging pipe (63).

2. The sand ilmenite tailings separation system of claim 1, wherein: one side of the water pool (1) is provided with a water pump (11), the water pump (11) is connected with a water supply pipe (12), and one end, far away from the water pool (1), of the water supply pipe (12) is communicated into the mixing tank (2).

3. The sand ilmenite tailing beneficiation system according to claim 1, wherein: the rotary ball mill is characterized in that a plurality of spiral stirring rods (21) are connected in the mixing tank (2) in a rotating mode, a discharging chute (22) is fixed to the rear end of the mixing tank (2) in a welding mode, and the bottom end of the discharging chute (22) extends to the feeding port of the ball mill (3).

4. The sand ilmenite tailing beneficiation system according to claim 1, wherein: the mud tank (7) is provided with a stirring device (71) in the middle, one side of the mud tank (7) is provided with a filter press delivery pump (72), the filter press delivery pump (72) is connected with a mud pipe (73), and one end, far away from the mud tank (7), of the mud pipe (73) is communicated into the chamber type filter press (8).

5. The sand ilmenite tailings separation system of claim 1, wherein: one side of the bottom end of the box-type filter press (8) is provided with a filtrate collecting tank (81), the bottom end of the filtrate collecting tank (81) is connected with a water return pipe (82), and one end, far away from the box-type filter press (8), of the water return pipe (82) is communicated into the water pool (1).

6. A sand ilmenite tailing separation treatment process is characterized by comprising the following steps: the treatment process adopts the sand ilmenite tailing system of any one of claims 1 to 5, and comprises the following steps:

s1, mixing placer and water according to the weight ratio of 1;

s2, transferring the ore pulp into a ball mill (3), and uniformly milling for 20-30 min at a critical rotating speed of 76-78%;

s3, transferring the ball-milled ore pulp into a gravity screw machine (4), feeding the ore pulp with different particle sizes into different spiral chutes, and carrying out graded gravity separation for 10-30 min;

s4, in the grading and gravity separation process, part of filtrate discharged by the gravity screw machine (4) is directly recycled into the ball mill (3), the other part of filtrate is discharged into the filter tank (5), and clear liquid obtained after filtering and precipitating in the filter tank (5) is recycled into the gravity screw machine (4) to wash the screw chute;

s5, transferring the ore pulp subjected to grading and gravity separation into a concentration tank (6), wherein sludge in the ore pulp is automatically deposited downwards under the action of gravity, and at the moment, overflow clear liquid separated from the upper layer in the concentration tank is conveyed back into the water tank (1) along a clear water discharge pipe (612);

s6, when the solid content of the sludge settled at the bottom of the concentration tank (6) reaches more than 20%, discharging the slurry downwards into a slurry tank (7);

s7, continuously rotating a stirring device (71) in the slurry tank (7) to keep the slurry flowing and avoid slurry deposition and agglomeration;

s8, conveying the sludge in the sludge tank (7) into a box type filter press (8) through a filter press conveying pump (72), and providing driving force for a screw air compressor (9) to push a filter plate to filter and press the sludge into a filter cake with the water content of 25% -30%;

s9, the filter cake is transported out of the dry pile through a loader, and meanwhile, the filter liquor which is filtered out through pressing is discharged in a concentrated mode and then flows back into the water pool (1) through a water return pipe (82).

7. The sand ilmenite tailing beneficiation process according to claim 6, wherein: in S3, ore pulp with different granularities enters different spiral chutes, and the method specifically comprises the following steps: coarse particles enter a 720-pitch plane spiral, medium particles enter a 640-pitch plane spiral, and fine particles enter a 640-pitch notch spiral.