Black tungsten recovery process

Abstract

The invention discloses a black tungsten recovery process, and relates to the technical field of preparation of black tungsten from muddy tungsten. Ore pulp with the concentration of 30% is prepared; magnetite in the ore pulp is removed through a permanent magnetic separator with the magnetic field intensity of 4500 gauss; the ore pulp without the magnetite is fed into a high-intensity magnetic separator with the magnetic field intensity ranging from 1.0 T to 1.3 T, and wolframite in the ore pulp is recycled; the wolframite rough concentrate is fed into a concentrate thickener to be concentrated, and the concentration is controlled to be 25%-35%; feeding into a centrifugal separator, and concentrating heavy minerals obtained by the centrifugal separator; concentration control lt; 30%; feeding into a centrifugal separator for many times; performing flotation; adding wolframite raw ore and water into a flotation machine; a proper amount of collecting agent and foaming agent are added, so that hydrophobicity is generated on the surfaces of wolframite particles; under the carrying of the bubbles, the wolframite particles float upwards to the surface of the ore pulp to form a foam layer; and wolframite particles floating on the surface are captured, washed with water and then dried, and wolframite concentrate is obtained. The method solves the technical problem that wolframite is difficult to recover from the argillized tungsten polymetallic ore.

Description

Technical Field

[0001] The invention relates to the technical field of preparing scheelite from tungsten sludge, and in particular to a scheelite recovery process. Background Art

[0002] Muddy tungsten polymetallic ore, muddy means that the mineral particle size is less than 0.15mm, and the content of particles less than 0.02mm is greater than 40%. Polymetallic ore refers to useful metals in the mineral, including but not limited to tungsten, molybdenum, bismuth, iron, and tin. The black tungsten is recovered by beneficiation to produce tungsten (measured in WO3) greater than 15%. Most of the existing technologies are aimed at recovering black tungsten from primary ores, and there is a lack of processes in the beneficiation of muddy tungsten polymetallic ore as raw material. Secondly, although the current high-intensity magnetic separator can adjust the magnetic field strength, it mostly uses high-pressure water guns for cleaning or shutdown and disassembly for cleaning when cleaning magnetically attracted materials, which takes a lot of time. To this end, we provide a black tungsten recovery process to solve the above problems.

[0003] Therefore, we provide a new type of elastomer and detection mechanism for the high pressure roller grinding cylinder to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to make up for the deficiencies of the prior art and to provide a black tungsten recovery process to solve the technical problem that it is difficult to recover black tungsten from muddy tungsten polymetallic ores.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A black tungsten recovery process comprises the following steps:

[0007] Step 1: Set up a slurry mixer and add water to dissolve the mineral raw materials to form a 30% concentration slurry;

[0008] Step 2, the ore pulp is passed through a permanent magnetic separator with a magnetic field strength of 4500 Gauss to remove magnetite in the ore pulp; the ore pulp is magnetically separated to form a weak magnetic roughing separation, and then the ore pulp after magnetic separation is passed into the feed port of the permanent magnetic separator again, and the weak magnetic roughing separation forms a weak magnetic fine separation, and then the magnetite on the permanent magnetic separator is cleaned to form a magnetite rough concentrate;

[0009] Step 3, sending the slurry from which magnetite has been removed into a high-intensity magnetic separator with a magnetic field strength of 1.0 Tesla to 1.3 Tesla to recover the wolframite therein to form a rough wolframite concentrate;

[0010] Step 4: Send the wolframite rough concentrate to the concentrate thickener for concentration, and the concentration is controlled at 25-35%;

[0011] Step 5, sending the concentrated slurry to a centrifugal concentrator, and concentrating the heavy minerals obtained by the centrifugal concentrator;

[0012] The concentration is controlled to be less than 30%; then it is sent to the centrifugal concentrator again;

[0013] This process is repeated three times to finally obtain the black tungsten ore; the frequency of the centrifugal concentrator is set to 50HZ, 40HZ, and 30HZ respectively;

[0014] Step 6, flotation; add wolframite ore and water into the flotation machine; add appropriate amount of collector and frother to make the surface of wolframite particles hydrophobic; under the influence of bubbles, the wolframite particles float to the surface of the pulp to form a foam layer;

[0015] The collector is an oxide ore collector, which includes one or more of alkyl sulfonates, alkyl sulfates, phosphates, arsenates, fatty amines, rosin amines and amphoteric surfactants; the concentration is usually between 0.01% and 0.5%, and the dosage is 460 to 870 g / t;

[0016] The foaming agent is one or more of pine oil, aliphatic hydrocarbon ester foaming agent and aromatic hydrocarbon ester foaming agent; the dosage is 315-1070 g / t; the foaming agent is added in the form of original solution;

[0017] The stirring speed of the flotation machine is not higher than 60r / min; and an observation port is provided to observe the flotation situation;

[0018] Step 7, capturing wolframite particles floating on the surface, washing with water and drying to obtain wolframite concentrate.

[0019] In a further technical solution, the high-intensity magnetic separator includes a frame, a material receiving box and a feed box, the material receiving box and the feed box are fixed in the frame, a magnetic separation drum is installed in the material receiving box, and the feed box is installed on one side of the magnetic separation drum; a discharge port is provided at the bottom of the material receiving box and is located at the bottom of the magnetic separation drum;

[0020] In step 3, the ore pulp is added to the high-intensity magnetic separator; a guide plate is provided at the bottom of the feed box, and the ore pulp enters the receiving box along the guide plate.

[0021] In a further technical solution, a circular shell is installed in the magnetic separation cylinder, a plurality of mounting grooves are arranged in the circular shell, and a partition plate is detachably installed in the mounting groove; and two groups of partition plates are installed in the circular shell, and a plurality of magnetic systems are suitable for abutting and installing between the partition plates;

[0022] A rotating shaft is arranged in the middle of the circular shell, and a connecting rod is arranged on the rotating shaft, and the connecting rod is fixedly connected to the circular shell;

[0023] The circular shell comprises a magnetic isolation portion and a mounting portion, wherein the mounting portion and the magnetic isolation portion are separated by a mounting groove; and the magnetic isolation portion is made of magnetic shielding material.

[0024] In a further technical solution, an open groove is provided on the top of the magnetic separation cylinder, and an extension plate is installed on the circular shell; and an arc-shaped baffle is installed outside the extension plate; the arc-shaped baffle, the circular shell and the magnetic separation cylinder have a common rotation axis.

[0025] In a further technical solution, a side opening is provided on the feed box, and a baffle plate is installed in the side opening, the top of the baffle plate is rotatably connected to the inner wall of the feed box, and a connecting spring is installed between the baffle plate and the feed box; the arc-shaped baffle plate is suitable for movably inserting into the side opening to cover the feed box.

[0026] In a further technical solution, a slide bar is installed on the circular shell, the slide bar extends out of the magnetic separation cylinder and is installed with a sliding handle; an upper arc groove is opened on the circular shell, and the upper arc groove is suitable for the slide bar to pass through;

[0027] A limiting piece is installed outside the circular shell, and the limiting piece is suitable for locking the sliding rod in the upper arc groove.

[0028] In a further technical solution, the limiter comprises a pull collar, a connecting groove is provided on the slide rod; the top end of the pull collar is suitable for being sleeved in the connecting groove; the pull collar is provided with an arc body, and one end of the rotating shaft is suitable for passing through the arc body;

[0029] A slider is installed at the bottom of the pull ring, and the slider slides in the pull ring; a lower linear groove is arranged outside the magnetic separation cylinder, a linear screw is installed in the lower linear groove, the slider is installed on the linear screw, and locking nuts are installed on both sides for locking;

[0030] In step 3, loosen the two sets of locking nuts of the linear screw, manually pull the sliding handle extending to the surface of the magnetic separation cylinder, select a suitable magnetic field strength, and fix the two sets of locking nuts;

[0031] When the wolframite needs to be cleaned, the two sets of locking nuts of the linear screw need to be loosened, the sliding handle needs to be turned to the end of the upper arc groove close to the feed box, and the two sets of locking nuts need to be fixed.

[0032] In a further technical solution, a water spray port is installed on the material receiving box, and a high-pressure water spray head arranged obliquely upward is installed in the water spray port and is suitable for spraying water onto the surface of the magnetic separation cylinder.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention adopts a combined beneficiation process of "magnetic-magnetic-gravity" for muddy tungsten polymetallic ores. Through the strong magnetic method in the strong magnetic separator, the magnetic field strength is controlled at 1.0 Tesla to 1.3 Tesla, and the gravity separation adopts three consecutive centrifugal beneficiation operations. Then, the black tungsten concentrate is extracted through flotation to achieve material quality improvement.

[0035] The present invention ensures the magnetic field strength by installing multiple sets of magnetic systems in the cylindrical shell, and realizes opening and closing or shielding the feed of the feed barrel through the arc-shaped baffle plate arranged outside, and realizes stable magnetic separation and cleaning of magnetic minerals on the magnetic separation barrel. The connection rotation and fixation are realized by the adjustable pull ring, and the position adjustment and fixation of the magnetic system in the magnetic separation barrel are realized. The magnetic system material at the bottom of the magnetic separation barrel can be dropped by adjusting the position of the magnetic shielding material, thereby achieving the effect of rapid cleaning. The present invention moves the connecting barrel on the linear screw, and has a limiting effect through two sets of locking nuts. The slider plate is provided with protrusions on both sides to slide in the pull ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The figure is a schematic diagram of the process flow of recovering black tungsten of the present invention;

[0037] Figure 2 It is a front view schematic diagram of the high-intensity magnetic separator of the present invention;

[0038] Figure 3 It is a front structural schematic diagram of the magnetic separation cylinder of the present invention;

[0039] Figure 4 It is a cross-sectional schematic diagram of the magnetic separation cylinder, the material receiving box and the material feeding box of the present invention;

[0040] Figure 5 for Figure 4 The enlarged structural diagram at A in the middle;

[0041] Figure 6 It is a schematic diagram of the sliding rod structure in the present invention;

[0042] Figure 7 It is a schematic diagram of the structure of the slider of the present invention;

[0043] Figure 8 It is a schematic structural diagram of the circular shell of the present invention.

[0044] In the figure:

[0045] 1. Frame; 2. Material receiving box; 3. Material feeding box; 4. Magnetic separation cylinder; 5. Guide plate; 6. Discharge port; 7. Round shell; 8. Mounting groove; 9. Partition plate; 10. Magnetic system; 11. Rotating shaft; 71. Magnetic isolation part; 72. Mounting part; 13. Opening groove; 14. Arc baffle plate; 15. Baffle plate; 16. Slide rod; 17. Sliding handle; 18. Upper arc groove; 19. Pull sleeve ring; 20. Connecting groove; 21. Arc body; 22. Sliding block; 23. Lower linear groove; 24. Linear screw; 25. Locking nut; 26. High-pressure sprinkler head. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Example 1

[0048] like Figure 1 As shown, an embodiment of the present invention is a black tungsten recovery process, comprising the following steps:

[0049] Step 1: Set up a slurry mixer and add water to dissolve the mineral raw materials to form a 30% concentration slurry;

[0050] Step 2, the ore pulp is passed through a permanent magnetic separator with a magnetic field strength of 4500 Gauss to remove magnetite in the ore pulp; the ore pulp is magnetically separated to form a weak magnetic roughing separation, and then the ore pulp after magnetic separation is passed into the feed port of the permanent magnetic separator again, and the weak magnetic roughing separation forms a weak magnetic fine separation, and then the magnetite on the permanent magnetic separator is cleaned to form a magnetite rough concentrate;

[0051] Step 3, sending the slurry from which magnetite has been removed into a high-intensity magnetic separator with a magnetic field strength of 1.0 Tesla to 1.3 Tesla to recover the wolframite therein to form a rough wolframite concentrate;

[0052] Step 4: Send the wolframite rough concentrate to the concentrate thickener for concentration, and the concentration is controlled at 25-35%;

[0053] Step 5, sending the concentrated slurry to a centrifugal concentrator, and concentrating the heavy minerals obtained by the centrifugal concentrator;

[0054] The concentration is controlled to be less than 30%; then it is sent to the centrifugal concentrator again;

[0055] This process is repeated three times to finally obtain the black tungsten ore; the frequency of the centrifugal concentrator is set to 50HZ, 40HZ, and 30HZ respectively;

[0056] Step 6, flotation; add wolframite ore and water into the flotation machine; add appropriate amount of collector and frother to make the surface of wolframite particles hydrophobic; carried by bubbles, wolframite particles float to the surface of the pulp to form a foam layer; while hydrophilic particles such as gangue minerals remain in the pulp, so as to separate wolframite from other minerals.

[0057] The collector is an oxide ore collector, which includes one or more of alkyl sulfonates, alkyl sulfates, phosphates, arsenates, fatty amines, rosin amines and amphoteric surfactants; the concentration is usually between 0.01% and 0.5%, and the dosage is 460 to 870 g / t;

[0058] The foaming agent is one or more of pine oil, aliphatic hydrocarbon ester foaming agent and aromatic hydrocarbon ester foaming agent; the dosage is 315-1070 g / t; the foaming agent is added in the form of stock solution. The foaming agent in this embodiment is not easily soluble in water, and the addition method can be selected to be added in stages;

[0059] The stirring speed of the flotation machine is not higher than 60r / min, and an observation port is provided to observe the flotation situation. Low speed can achieve stirring and avoid damaging the floating black tungsten particles.

[0060] Step 7, capturing wolframite particles floating on the surface, washing with water and drying to obtain wolframite concentrate.

[0061] The present invention can solve the problem that muddy tungsten ore cannot be recycled, and adopts a combined beneficiation scheme of magnetic separation and gravity separation. There is no residual beneficiation agent in the beneficiation wastewater, and there is no environmental burden. The present invention adopts a combined beneficiation process of "magnetic-magnetic-gravity" for muddy tungsten polymetallic ore. Through the strong magnetic method in the strong magnetic separator, the magnetic field intensity is controlled at 1.0 Tesla to 1.3 Tesla, and the gravity separation adopts three continuous centrifugal beneficiation operations. Then, the black tungsten concentrate is extracted by flotation to achieve material quality improvement.

[0062] Example 2

[0063] like Figure 2-8 As shown, another embodiment of the present invention is based on Example 1. Figure 2 As shown, the high-intensity magnetic separator includes a frame 1, a material receiving box 2 and a feed box 3, the material receiving box 2 and the feed box 3 are fixed in the frame 1, a magnetic separation cylinder 4 is installed in the material receiving box 2, and the feed box 3 is installed on one side of the magnetic separation cylinder 4; a discharge port 6 is provided at the bottom of the material receiving box 2 and is located at the bottom of the magnetic separation cylinder 4;

[0064] In step 3, the ore pulp is added into the high-intensity magnetic separator; a guide plate 5 is provided at the bottom of the feed box 3, and the ore pulp enters the receiving box 2 along the guide plate 5.

[0065] like Figure 4 and 8 As shown, a circular shell 7 is installed in the magnetic separation cylinder 4, a plurality of mounting grooves 8 are arranged in the circular shell 7, and a partition plate 9 is detachably installed in the mounting groove 8; and two groups of partition plates 9 are installed in the circular shell 7, and a plurality of magnetic systems 10 are suitable for being abutted and installed between the partition plates 9; a rotating shaft 11 is arranged in the middle of the circular shell 7, and a connecting rod 12 is arranged on the rotating shaft 11, and the connecting rod 12 is fixedly connected to the circular shell 7; the circular shell 7 includes a magnetic isolation portion 71 and an installation portion 72, and the installation portion 72 is separated from the magnetic isolation portion 71 by the installation groove 8; and the magnetic isolation portion 71 is a magnetic shielding material, and adjusting the position of the magnetic shielding material can realize the falling of the magnetic material at the bottom of the magnetic separation cylinder, thereby achieving a quick cleaning effect.

[0066] like Figure 4 As shown, the top of the magnetic separator 4 is provided with an opening slot 13, and an extension plate is installed on the circular shell 7; and an arc-shaped baffle 14 is installed outside the extension plate; the arc-shaped baffle 14, the circular shell 7 and the magnetic separator 4 share a common rotation axis. The feed box 3 is provided with a lateral opening, and a baffle plate 15 is installed in the lateral opening, the top of the baffle plate 15 is rotatably connected to the inner wall of the feed box 3, and a connecting spring is installed between the baffle plate 15 and the feed box 3; the arc-shaped baffle 14 is suitable for movably inserting into the lateral opening to shield the feed box 3.

[0067] Combination Figure 3 and 6 As shown, a slide rod 16 is installed on the circular shell 7, and the slide rod 16 extends out of the magnetic separation cylinder 4 and is installed with a sliding handle 17; an upper arc groove 18 is opened on the circular shell 7, and the upper arc groove 18 is suitable for the slide rod 16 to pass through; a limit member is installed outside the circular shell 7, and the limit member is suitable for locking the slide rod 16 in the upper arc groove 18.

[0068] The limiting member includes a pull ring 19, and a connecting groove 20 is provided on the slide rod 16; the top of the pull ring 19 is suitable for being sleeved in the connecting groove 20; the pull ring 19 is provided with an arc portion 21, and one end of the rotating shaft 11 is suitable for passing through the arc portion 21; a slider 22 is installed at the bottom of the pull ring 19, and the slider 22 is as shown in FIG. Figure 7 The figure shows a set of connecting cylinders and a set of slider plates connected by hinges, the two can rotate with each other, the slider 22 slides in the pull ring 19; the magnetic separation cylinder 4 is provided with a lower linear groove 23, a linear screw 24 is installed in the lower linear groove 23, the slider 22 is installed on the linear screw 24, and locking nuts 25 are installed on both sides for locking; this embodiment moves on the linear screw through the connecting cylinder, rather than threaded connection, and the two sets of locking nuts play a limiting effect. The slider plate is provided with protrusions on both sides to slide in the pull ring, and the corresponding pull ring is provided with grooves, which are adapted to the protrusions, but not drawn in this figure.

[0069] In step 3, the two sets of locking nuts 25 of the linear screw 24 are loosened, the sliding handle 17 extending to the surface of the magnetic separation cylinder 4 is manually pulled, a suitable magnetic field strength is selected, and the two sets of locking nuts 25 are fixed;

[0070] When the wolframite needs to be cleaned, the two sets of locking nuts 25 of the linear screw 24 need to be loosened, the sliding handle 17 needs to be rotated to the end of the upper arc groove 18 close to the feed box 3, and the two sets of locking nuts 25 need to be fixed.

[0071] A water spray port is installed on the receiving box 2, and a high-pressure water spray head 26 is installed in the water spray port and is suitable for spraying water on the surface of the magnetic separation cylinder 4. The present invention ensures the magnetic field strength by installing multiple sets of magnetic systems in the cylindrical shell, and realizes opening and closing or shielding the feeding of the feed cylinder through the arc-shaped baffle plate arranged outside, and realizes stable magnetic separation and cleaning of magnetic minerals on the magnetic separation cylinder. And the connection rotation and fixation are realized through the adjustable pull ring, and the position adjustment and fixation of the magnetic system in the magnetic separation cylinder are realized.

[0072] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0073] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A black tungsten recovery process, characterized in that: The following steps are involved: Step 1: Set up a slurry mixer and add water to dissolve the mineral raw materials to form a 30% concentration slurry; Step 2, the ore pulp is passed through a permanent magnetic separator with a magnetic field strength of 4500 Gauss to remove magnetite in the ore pulp; the ore pulp is magnetically separated to form a weak magnetic roughing separation, and then the ore pulp after magnetic separation is passed into the feed port of the permanent magnetic separator again, and the weak magnetic roughing separation forms a weak magnetic fine separation, and then the magnetite on the permanent magnetic separator is cleaned to form a magnetite rough concentrate; Step 3, sending the slurry from which magnetite has been removed into a high-intensity magnetic separator with a magnetic field strength of 1.0 Tesla to 1.3 Tesla to recover the wolframite therein to form a rough wolframite concentrate; Step 4: Send the wolframite rough concentrate to the concentrate thickener for concentration, and the concentration is controlled at 25-35%; Step 5, sending the concentrated slurry to a centrifugal concentrator, and concentrating the heavy minerals obtained by the centrifugal concentrator; The concentration is controlled to be less than 30%; then it is sent to the centrifugal concentrator again; This process is repeated three times to finally obtain the black tungsten ore; the frequency of the centrifugal concentrator is set to 50HZ, 40HZ, and 30HZ respectively; Step 6, flotation; add wolframite ore and water into the flotation machine; add appropriate amount of collector and frother to make the surface of wolframite particles hydrophobic; under the influence of bubbles, the wolframite particles float to the surface of the pulp to form a foam layer; The collector is an oxide ore collector, which includes one or more of alkyl sulfonates, alkyl sulfates, phosphates, arsenates, fatty amines, rosin amines and amphoteric surfactants; the concentration is usually between 0.01% and 0.5%, and the dosage is 460 to 870 g / t; The foaming agent is one or more of pine oil, aliphatic hydrocarbon ester foaming agent and aromatic hydrocarbon ester foaming agent; the dosage is 315-1070 g / t; the foaming agent is added in the form of original solution; The stirring speed of the flotation machine is not higher than 60r / min; and an observation port is provided to observe the flotation situation; Step 7, capturing wolframite particles floating on the surface, washing with water and drying to obtain wolframite concentrate.

2. A black tungsten recovery process according to claim 1, characterized in that: The high-intensity magnetic separator comprises a frame (1), a material receiving box (2) and a material feeding box (3); the material receiving box (2) and the material feeding box (3) are fixed in the frame (1); a magnetic separation cylinder (4) is installed in the material receiving box (2); and the material feeding box (3) is installed on one side of the magnetic separation cylinder (4); a discharge port (6) is provided at the bottom of the material receiving box (2) and is located at the bottom of the magnetic separation cylinder (4); In step 3, the ore pulp is added to the high-intensity magnetic separator; a guide plate (5) is provided at the bottom of the feed box (3), and the ore pulp enters the receiving box (2) along the guide plate (5).

3. A black tungsten recovery process according to claim 2, characterized in that: A circular shell (7) is installed in the magnetic separation cylinder (4), a plurality of installation grooves (8) are arranged in the circular shell (7), and a partition plate (9) is detachably installed in the installation groove (8); and two groups of partition plates (9) are installed in the circular shell (7), and a plurality of magnetic systems (10) are suitable for being abutted and installed between the partition plates (9); A rotating shaft (11) is arranged in the middle of the circular shell (7), and a connecting rod (12) is arranged on the rotating shaft (11), wherein the connecting rod (12) is fixedly connected to the circular shell (7); The circular shell (7) comprises a magnetic isolation portion (71) and a mounting portion (72); the mounting portion (72) and the magnetic isolation portion (71) are separated by a mounting groove (8); and the magnetic isolation portion (71) is made of magnetic shielding material.

4. A black tungsten recovery process according to claim 2, characterized in that: The top of the magnetic separation cylinder (4) is provided with an opening groove (13), and an extension plate is installed on the circular shell (7); and an arc-shaped baffle plate (14) is installed outside the extension plate; the arc-shaped baffle plate (14), the circular shell (7) and the magnetic separation cylinder (4) have a common rotation axis.

5. A black tungsten recovery process according to claim 4, characterized in that: The feed box (3) is provided with a side opening, and a baffle plate (15) is installed in the side opening, the top of the baffle plate (15) is rotatably connected to the inner wall of the feed box (3), and a connecting spring is installed between the baffle plate (15) and the feed box (3); the arc-shaped baffle plate (14) is suitable for being movably inserted into the side opening to cover the feed box (3).

6. A black tungsten recovery process according to claim 4, characterized in that: A slide bar (16) is installed on the circular shell (7), the slide bar (16) extends out of the magnetic separation cylinder (4) and is installed with a slide handle (17); an upper arc groove (18) is opened on the circular shell (7), and the upper arc groove (18) is suitable for the slide bar (16) to pass through; A limiting member is installed outside the circular shell (7), and the limiting member is suitable for locking the sliding rod (16) in the upper arc groove (18).

7. A black tungsten recovery process according to claim 4, characterized in that: The limiting member comprises a pull ring (19), and a connecting groove (20) is provided on the slide rod (16); the top end of the pull ring (19) is suitable for being sleeved in the connecting groove (20); the pull ring (19) is provided with an arc body (21), and one end of the rotating shaft (11) is suitable for passing through the arc body (21); A slider (22) is installed at the bottom of the pull ring (19), and the slider (22) slides in the pull ring (19); a lower linear groove (23) is arranged outside the magnetic separation cylinder (4), a linear screw (24) is installed in the lower linear groove (23), the slider (22) is installed on the linear screw (24), and locking nuts (25) are installed on both sides for locking; In step 3, the two sets of locking nuts (25) of the linear screw (24) are loosened, the sliding handle (17) extending to the surface of the magnetic separation cylinder (4) is manually pulled, a suitable magnetic field strength is selected, and the two sets of locking nuts (25) are fixed; When the wolframite needs to be cleaned, the two sets of locking nuts (25) of the linear screw (24) need to be loosened, the sliding handle (17) is rotated to the end of the upper arc groove (18) close to the feed box (3), and the two sets of locking nuts (25) are fixed.

8. A black tungsten recovery process according to claim 4, characterized in that: A water spray port is installed on the material receiving box (2), and a high-pressure water spray head (26) arranged obliquely upward is installed in the water spray port and is suitable for spraying water onto the surface of the magnetic separation cylinder (4).

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