A black tungsten recovery process

Abstract

The present invention discloses a wolframite recovery process, which relates to the technical field of preparing wolframite from muddy tungsten. The process comprises preparing a 30% concentration ore pulp; passing the ore pulp through a permanent magnetic separator with a magnetic field strength of 4500 gauss to remove magnetite from the ore pulp; feeding the magnetite-removed ore pulp into a high-intensity magnetic separator with a magnetic field strength of 1.0T to 1.3T to recover the wolframite therein; feeding the wolframite crude concentrate into a concentrate thickener to concentrate the concentrate to a concentration of 25-35%; feeding the concentrate into a centrifugal concentrator to concentrate the heavy minerals obtained by the centrifugal concentrator; controlling the concentration to less than 30%; and then feeding the centrifugal concentrator multiple times; flotation; adding wolframite ore and water into the flotation machine; adding an appropriate amount of collector and frother to make the surface of the wolframite particles hydrophobic; carried by bubbles, the wolframite particles float to the surface of the ore pulp to form a foam layer; capturing the wolframite particles floating on the surface, washing with water, and then drying to obtain a wolframite concentrate. The present invention solves the technical problem of the difficulty in recovering wolframite from muddy tungsten polymetallic ores.

Description

Technical Field

[0001] The invention relates to the technical field of preparing wolframite from tungsten mud, and in particular to a process for recovering wolframite. 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, from which ferromagnetic tungsten is recovered by beneficiation to produce tungsten containing more than 15% (measured in WO3). Most of the existing technologies are aimed at recovering ferromagnetic tungsten from primary ores, and there is a lack of processes for beneficiation using 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 ferromagnetic 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 shortcomings of the existing technology and provide a black tungsten recovery process to solve the technical problem that it is difficult to recover black tungsten from muddy tungsten polymetallic ore.

[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 from 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 is formed into a weak magnetic fine separation, and then the magnetite on the permanent magnetic separator is cleaned to form a magnetite coarse concentrate;

[0009] Step 3: Send the slurry from which the 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 crude concentrate to the concentrate thickener for concentration, and the concentration is controlled at 25-35%;

[0011] Step 5: The concentrated slurry is fed into a centrifugal concentrator to concentrate the heavy minerals obtained by the centrifugal concentrator;

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

[0013] This process is repeated three times to finally obtain wolframite ore. The frequencies of the centrifugal concentrator are set to 50HZ, 40HZ, and 30HZ respectively.

[0014] Step 6: Flotation. Add wolframite ore and water into the flotation machine. Add appropriate amounts of collector and frother to make the surface of the wolframite particles hydrophobic. Carried by 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 315-1070g / t; the foaming agent is added in the form of a stock solution;

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

[0018] Step 7: Capture wolframite particles floating on the surface, wash with water, and then dry to obtain wolframite concentrate.

[0019] In a further technical solution, the high-intensity magnetic separator includes a frame, a material receiving box and a material feeding box, the material receiving box and the material feeding box are fixed in the frame, a magnetic separation drum is installed in the material receiving box, and the material feeding 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 separator, multiple sets of mounting slots are provided in the circular shell, and partition plates are detachably installed in the mounting slots; and two sets of partition plates are installed in the circular shell, and multiple sets of magnetic systems are suitable for abutting and mounting between the partition plates;

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

[0023] The circular shell includes 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 slot is provided on the top of the magnetic separator, 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 separator share 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 is suitable for movably inserting into the side opening to cover the feed box.

[0026] In a further technical solution, a slide rod is mounted on the circular shell, the slide rod extends out of the magnetic separation drum and is mounted with a sliding handle; an upper arc-shaped groove is opened on the circular shell, and the upper arc-shaped groove is suitable for the slide rod 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 includes a pull ring, a connecting groove is provided on the slide rod; the top end of the pull ring is suitable for being sleeved in the connecting groove; the pull ring is provided with an arc portion, and one end portion of the rotating shaft is suitable for passing through the arc portion;

[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 provided on the outside of 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 on the linear screw, manually pull the sliding handle that extends to the surface of the magnetic separator, select the appropriate 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 is installed in the water spray port and is arranged obliquely upward and is suitable for spraying water onto the surface of the magnetic separation drum.

[0033] Compared with the existing technology, it 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 continuous centrifugal beneficiation operations. Then, the wolframite concentrate is extracted by 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 the opening and closing or shielding of the feed barrel through the arc-shaped baffle installed on the outside, thereby realizing 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. Adjusting the position of the magnetic shielding material can make the magnetic material at the bottom of the magnetic separation barrel fall, 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 within the pull ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the process flow for recovering wolframite 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 drum, the material receiving box and the material feeding box of the present invention;

[0040] Figure 5 for Figure 4 A schematic diagram of the structure enlarged in the middle;

[0041] Figure 6 Schematic diagram of the sliding rod structure in the present invention;

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

[0043] Figure 8 Schematic diagram of the structure of the circular shell of the present invention.

[0044] In the picture:

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

[0046] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] Example 1

[0048] like Figure 1 As shown in FIG. 1 , an embodiment of the present invention is a 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 from 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 is formed into a weak magnetic fine separation, and then the magnetite on the permanent magnetic separator is cleaned to form a magnetite coarse concentrate;

[0051] Step 3: Send the slurry from which the 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 crude concentrate to the concentrate thickener for concentration, and the concentration is controlled at 25-35%;

[0053] Step 5: The concentrated slurry is fed into a centrifugal concentrator to concentrate the heavy minerals obtained by the centrifugal concentrator;

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

[0055] This process is repeated three times to finally obtain wolframite ore. The frequencies of the centrifugal concentrator are set to 50HZ, 40HZ, and 30HZ respectively.

[0056] Step 6: Flotation. Add wolframite ore and water into the flotation machine. Add appropriate amounts of collector and frother to make the surface of the wolframite particles hydrophobic. Carried by the bubbles, the wolframite particles float to the surface of the slurry to form a foam layer. Hydrophilic particles such as gangue minerals remain in the slurry, thus separating the 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 315-1070g / t; the foaming agent is added in the form of a stock solution. The foaming agent in this embodiment is not easily soluble in water, so 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: Capture wolframite particles floating on the surface, wash with water, and then dry to obtain wolframite concentrate.

[0061] This invention addresses the problem of unrecoverable argillized tungsten ore. It utilizes a combined magnetic and gravity separation process, eliminating residual dressing agents in the wastewater and minimizing environmental impact. This process utilizes a combined "magnetic-magnetic-gravity" separation process for argillized tungsten polymetallic ores. The high-intensity magnetic separation method in the high-intensity magnetic separator controls the magnetic field strength to between 1.0 and 1.3 Tesla. Gravity separation utilizes three continuous centrifugal separation operations. Wolframite concentrate is then extracted through flotation, achieving improved material quality.

[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 drum 4 is installed in the material receiving box 2, and the feed box 3 is installed on one side of the magnetic separation drum 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 drum 4.

[0064] 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.

[0065] like Figure 4 and 8 As shown, a circular shell 7 is installed in the magnetic separation cylinder 4, and multiple groups of mounting grooves 8 are provided in the circular shell 7, and partition plates 9 are detachably installed in the mounting grooves 8; and two groups of partition plates 9 are installed in the circular shell 7, and multiple groups of magnetic systems 10 are suitable for being abutted and installed between the partition plates 9; a rotating shaft 11 is provided in the middle of the circular shell 7, and a connecting rod 12 is provided 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 mounted on the circular shell 7; an arc-shaped baffle 14 is mounted 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 side opening, and a baffle plate 15 is mounted within 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 14 is adapted to be movably inserted into the side opening to shield the feed box 3.

[0067] Combine 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, 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; an arc portion 21 is provided on the pull ring 19, 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 diagram shows a set of connecting cylinders and a set of slider plates connected by a hinge, allowing them to rotate relative to each other. The slider member 22 slides within the pull ring 19. The magnetic separation cylinder 4 is provided with a lower linear groove 23, within which a linear screw 24 is mounted. The slider member 22 is mounted on the linear screw 24 and secured with locking nuts 25 on both sides. In this embodiment, the connecting cylinder moves on the linear screw, rather than through a threaded connection, and two sets of locking nuts provide a position-limiting effect. The slider plates, on the other hand, have protrusions on both sides that slide within the pull ring. The pull ring has corresponding grooves that mate with the protrusions, though this figure does not show them.

[0069] In step 3, loosen the two sets of locking nuts 25 of the linear screw 24, manually pull the sliding handle 17 extending to the surface of the magnetic separation cylinder 4, select a suitable magnetic field strength, and fix the two sets of locking nuts 25;

[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 jet is mounted on the receiving box 2, and a high-pressure water jet head 26 is installed inside the jet, directed obliquely upward, to spray water onto the surface of the magnetic separator drum 4. The present invention maintains magnetic field strength by installing multiple magnetic systems within the cylindrical shell. Externally disposed curved baffles are used to open, close, or block the feed drum, achieving stable magnetic separation and cleaning of magnetic minerals on the drum. An adjustable pull ring is used to achieve connection, rotation, and fixation, allowing the magnetic system to be adjusted and fixed within the drum.

[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 invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0073] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A wolframite 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 from 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 is formed into a weak magnetic fine separation, and then the magnetite on the permanent magnetic separator is cleaned to form a magnetite coarse concentrate; Step 3: Send the slurry from which the 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 crude concentrate to the concentrate thickener for concentration, and the concentration is controlled at 25-35%; Step 5: The concentrated slurry is fed into a centrifugal concentrator to concentrate the heavy minerals obtained by the centrifugal concentrator; The concentration is controlled at <30% and then sent to the centrifugal concentrator again; This process is repeated three times to finally obtain wolframite ore. The frequencies of the centrifugal concentrator are set to 50HZ, 40HZ, and 30HZ respectively. Step 6: Flotation. Add wolframite ore and water into the flotation machine. Add appropriate amounts of collector and frother to make the surface of the wolframite particles hydrophobic. Carried by 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 315-1070g / t; the foaming agent is added in the form of a stock solution; The stirring speed of the flotation machine shall not exceed 60r / min; and an observation port shall be provided to observe the flotation situation; Step 7: Capture wolframite particles floating on the surface, wash with water, and then dry 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), wherein the material receiving box (2) and the material feeding box (3) are fixed in the frame (1), a magnetic separation drum (4) is installed in the material receiving box (2), and the material feeding box (3) is installed on one side of the magnetic separation drum (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 drum (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 mounting grooves (8) are provided 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 provided in the middle of the circular shell (7), and a connecting rod (12) is provided 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), wherein 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: An opening slot (13) is provided on the top of the magnetic separator (4), 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.

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 shield the feed box (3).

6. A black tungsten recovery process according to claim 4, characterized in that: A slide rod (16) is mounted on the circular shell (7), the slide rod (16) extending out of the magnetic separator (4) and being mounted with a slide handle (17); an upper arc-shaped groove (18) is formed on the circular shell (7), and the upper arc-shaped groove (18) is suitable for the slide rod (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 6, characterized in that: The limiting member includes 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 portion (21), and one end portion 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) slides in the pull ring (19); a lower linear groove (23) is provided 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, and the sliding handle (17) extending to the surface of the magnetic separation cylinder (4) is manually pulled, and 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) is installed in the water spray port and is arranged obliquely upward, and is suitable for spraying water onto the surface of the magnetic separation cylinder (4).

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