Beneficiation method for recovering tungsten from polymetallic tungsten ore tailings

Abstract

The invention discloses a beneficiation method for recovering tungsten from polymetallic tungsten ore tailings, which is characterized by comprising the following steps: carrying out strong magnetic separation to obtain strong magnetic concentrate and strong magnetic tailings; concentrating the strong magnetic concentrate until the concentration is 30% of ore pulp, adding sodium carbonate until the pH value of the ore pulp is 7.0-9.0, then adding sodium hexametaphosphate, OS, salinized water glass, lead nitrate and a tungsten catching agent, mixing, and feeding into a flotation machine to obtain wolframite concentrate and wolframite tailings; the strong magnetic tailings are blended into ore pulp with the concentration being 30%, oxalic acid, water glass and a catching agent LLR are added, the mixture enters a flotation machine after being mixed, and scheelite-fluorite concentrate and co-flotation tailings are obtained; and the scheelite-fluorite concentrate is concentrated until the concentration is 30%, and then one-roughing and three-refining centrifugal reselection is carried out, so that scheelite concentrate and fluorite concentrate are obtained. Under the acidic condition, the flotation effect of fluorite is enhanced, interference on scheelite flotation is reduced as much as possible, and the recovery rate and grade of wolframite concentrate and scheelite concentrate are both improved.

Description

Technical Field

[0001] The present invention relates to a technical field, and in particular to a beneficiation method for recovering tungsten from polymetallic tungsten ore tailings. Background Art

[0002] Tungsten is an important strategic material and is widely used in important fields such as aerospace, machinery manufacturing, and national defense industry.

[0003] Black and white tungsten paragenetic ore is a difficult ore to be processed, which is often accompanied by calcium-rich fluorite, calcite and calcium- and magnesium-rich tremolite. These gangues have similar surface properties to scheelite. In order to suppress these gangues, a large amount of inhibitors are often needed. Common inhibitors are water glass, sodium hexametaphosphate, sodium fluorosilicate, carboxymethyl cellulose, etc. In the mixed flotation of black and white tungsten paragenetic ore, the addition of lead nitrate helps to enhance the chelating agent's ability to collect scheelite and wolframite, and reduce the amount of collector. The collectors used in the mixed flotation of black and white tungsten paragenetic ore are generally fatty acid collectors, chelating collectors and fatty acid collectors. In terms of the process flow of black and white tungsten paragenetic ore beneficiation, it is also particularly important to choose a suitable process flow, which is also the key to achieving better mineral processing technical indicators.

[0004] After searching, it was found that CN113369005A discloses a beneficiation method for mixed refractory tungsten ore, which includes the following steps: (1) grinding the crushed black and white tungsten paragenetic ore to obtain slurry; (2) the pH value of the slurry is 7.0-9.0, and inhibitors, activators, lead nitrate, and collectors are added to perform mixed tungsten roughing to obtain tungsten rough concentrate slurry and roughing tailings slurry respectively; (3) the roughing tailings slurry is subjected to two mixed tungsten sweeping operations, The tungsten scavenging tailings I are obtained; (4) weak magnetic iron removal is performed on the tungsten rough concentrate pulp to obtain magnetic iron products and magnetic tailings pulp; (5) strong magnetic roughing and scavenging are performed on the magnetic tailings pulp to obtain black tungsten concentrate products and scavenging tailings respectively; (6) the scavenging tailings are dehydrated by dense concentration to obtain a pulp with a concentration of 60% to 70%; (7) the 60% to 70% pulp is subjected to scheelite flotation to obtain scheelite concentrate and tungsten scavenging tailings II respectively. This technology ignores the oxidation problem of the original ore, resulting in the denaturation of the scheelite surface, the occurrence of tailings during flotation, and the decrease of the scheelite recovery rate. Summary of the invention

[0005] The technical problem to be solved by the present invention is that oxidation of the raw ore occurs in the existing mineral processing technology, resulting in surface denaturation of scheelite, tailing occurs during flotation, and the recovery rate of scheelite decreases.

[0006] In order to solve the above technical problems, the inventors have obtained the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

[0007] A beneficiation method for recovering tungsten from polymetallic tungsten ore tailings, comprising:

[0008] Step 1: Strong magnetic separation

[0009] Taking the sulfide ore full float tailings as the raw ore, the particle size is -74μm accounting for 80%-95% of the weight, and through 1.0-1.3 Tesla strong magnetic separation, strong magnetic concentrate and strong magnetic tailings are obtained;

[0010] Step 2, black tungsten flotation

[0011] The strong magnetic concentrate is concentrated to a pulp with a concentration of 30%, and 500g / t of sodium carbonate is added to the pulp until the pH value is 7.0-9.0, then 20g / t of sodium hexametaphosphate is added and stirred for 2min, 50g / t of OS is added and stirred for 2min, 1500g / t of salted water glass is added and stirred for 2min, 500g / t of lead nitrate is added and stirred for 2min, 800g / t of tungsten capture agent is added and stirred for 2min, and then mixed and fed into a flotation machine to obtain wolframite concentrate and wolframite tailings;

[0012] Step 3, Scheelite-Fluorite Flotation

[0013] The strong magnetic tailings are prepared into a slurry with a concentration of 30%, and 4kg / t of oxalic acid is added and stirred for 30 minutes, then 1kg / t of water glass is added and stirred for 2 minutes, and 1kg / t of capture agent LLR is added and stirred for 2 minutes, and then mixed and fed into a flotation machine to obtain scheelite-fluorite concentrate and co-floating tailings;

[0014] Step 4: Centrifugal re-selection

[0015] The scheelite-fluorite concentrate is concentrated to a concentration of 30%, and then subjected to "one coarse and three fine" centrifugal gravity separation to obtain scheelite concentrate and fluorite concentrate.

[0016] Preferably, the stirring process is completed in a mixing tank, which is provided with a mounting plate, a fixed plate, and a drug adding tube, a horizontal plate is provided on the top of the fixed plate, the horizontal plate extends to the middle position of the top of the mixing tank, a reduction motor is installed on the horizontal plate, a driving gear is installed on the output end of the reduction motor, the mounting plate is located in the mixing tank, a mounting slot is provided in the middle of the mounting plate, and the slot wall of the mounting slot is a spherical surface, a sphere is installed in the mounting slot, a fixing hoop is mounted on the outer side of the sphere, the fixing hoop is mounted on the mounting plate, symmetrically distributed connecting rod 1 and connecting rod 2 are installed on the sphere, a gear disk is installed on the end of the connecting rod 1 away from the sphere, a stirring head is installed on the end of the connecting rod 2 away from the sphere, the gear disk is meshed with the driving gear and the connecting rods are arranged obliquely.

[0017] Preferably, a stirring body is installed on the side of the stirring head. The stirring body is made of flexible material or is rotatably installed on the side of the stirring head to mix and stir the dead corners in the mixing tank.

[0018] Preferably, the drug mixing process:

[0019] The set amount of reagent is added through the reagent adding tube, and the reduction motor drives the driving gear to rotate. The driving gear drives the meshing gear plate to rotate around the driving gear while rotating. The stirring head mixes and stirs in a large range at the bottom of the mixing tank, and at the same time drives the stirring body to mix and stir the dead corners of the mixing tank.

[0020] Preferably, the concentration operation is completed in a two-stage concentration tank, which is two concentration tanks arranged in series, and the concentration tank is provided with a feed port, a concentration port, and an overflow port. The concentration tank is provided with an inclined baffle, and the bottom of the baffle is arranged close to the feed port;

[0021] The bottom of the concentration tank is a conical structure. A notch is provided at the bottom of the concentration tank. A polyurethane sealing strip is installed at the notch. A deposition and conveying structure is provided outside the notch to convey the concentrated mineral particles to the concentration port.

[0022] Preferably, the deposition conveying structure includes a motor group, a conveying roller one and a conveying roller two installed on the outer wall of the concentration tank, the output end of the motor group is connected to the conveying roller one, a deposition belt is installed on the outside of the conveying roller one and the conveying roller two, a clamping member is installed in the area between the conveying roller one and the conveying roller two, the clamping member runs through the interior of the deposition belt, and a clamping roller evenly distributed across the notch is arranged on the side of the clamping member opposite to the notch.

[0023] Preferably, a vibration block is provided on the side of the baffle facing away from the feed inlet.

[0024] Preferably, the baffle surface is evenly distributed with horizontally arranged flow-uniform holes.

[0025] Preferably, the concentration process is:

[0026] Step 11, initial concentration

[0027] The slurry slowly enters the concentration tank through the feed port. The incoming slurry is intercepted by the baffle and initially concentrated. The concentration near the feed port of the baffle is greater than the concentration near the overflow port. At the same time, the flow-uniform hole makes the slurry flow horizontally to avoid crosstalk and affect the concentration of the slurry at the bottom.

[0028] Step 12, deposition and delivery

[0029] The slurry on the side of the baffle plate close to the feed port enters the bottom of the concentration tank for sedimentation and concentration. When the slurry is deposited and concentrated, the slurry particles are deposited on the sedimentation belt. The sedimentation belt is transported to the concentration port in a direction under the action of the motor group. The conveying speed is 10-20mm / min. A concentration sensor is provided at the concentration port. The concentration sensor and the switch valve at the concentration port are connected through a PLC controller. The concentration signal collected by the concentration sensor is transmitted to the PLC controller. The PLC controller determines whether the setting threshold is met. If it is met, the switch valve is controlled to open the concentration port to complete the concentration discharge.

[0030] Step 13, overflow secondary concentration

[0031] The slurry overflowing from the overflow port enters the second thickening tank, and steps 11 and 12 are repeated. The overflow slurry is discharged after being treated to meet the discharge standards.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention uses sulfide ore full float tailings as raw materials (containing 0.43% tungsten) to obtain strong magnetic concentrate and strong magnetic tailings through strong magnetic separation, concentrates the strong magnetic concentrate, and then flots scheelite to obtain scheelite concentrate with a grade of 67.27% and a cumulative recovery rate of 22.06%, then performs a scheelite-fluorite co-floatation operation to obtain scheelite-fluorite concentrate, and then performs centrifugal gravity separation to obtain scheelite concentrate with a grade of 17.96% and a cumulative recovery rate of 20.42%, thereby improving the recovery rate and grade of scheelite concentrate and scheelite concentrate.

[0034] 2. In the present invention, when scheelite and fluorite are floated together, under acidic conditions, oxalic acid can more effectively react with metal ions on the surface of fluorite to form a stable complex. This helps to enhance the hydrophobicity of fluorite particles, making it easier to be captured by the flotation agent and float to the surface of the pulp. This achieves the effect of enhancing the flotation of fluorite while minimizing the interference with the flotation of scheelite.

[0035] 3. The present invention makes targeted improvements to the concentration tank in order to accelerate the concentration process and improve the concentration efficiency to achieve rapid concentration. Since the concentration of the bottom concentration layer is relatively high, the viscosity of the slurry will gradually increase as the concentration increases, and it is very easy for the slurry to stick to the bottom inner wall. Cleaning operations are required after each concentration, making it impossible to complete continuous concentration operations. A receiving belt for directional downward transportation is added to the concentration tank. The receiving belt is used to accelerate mineral concentration and prevent the mineral from sticking to the bottom inner wall.

[0036] 4. The present invention also makes targeted improvements to the mixing tank, using a stirring head to mix and stir in a large range at the bottom of the mixing tank to achieve rapid and uniform mixing, while also avoiding dead corners in mixing and stirring, and preventing the slurry from settling on the inside, which affects the mineral processing grade and recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the mineral processing process of the present invention;

[0038] Figure 2 It is the structure distribution diagram in the mixing tank of the present invention;

[0039] Figure 3 It is a structural schematic diagram of the two-stage concentrating tank of the present invention;

[0040] Figure 4 for Figure 3 Structural schematic diagram of the deposition transport structure;

[0041] Figure 5 for Figure 4 Side view of the intermediate concentrator tank. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] Example 1

[0045] like Figure 1 As shown, a beneficiation method for recovering tungsten from polymetallic tungsten ore tailings comprises:

[0046] Step 1: Strong magnetic separation

[0047] The sulfide ore full float tailings are used as the raw ore, and the strong magnetic concentrate and strong magnetic tailings are obtained through 1.0-1.3 Tesla strong magnetic separation.

[0048] Step 2, black tungsten flotation

[0049] The strong magnetic concentrate is concentrated to a pulp with a concentration of 30%, and 500g / t of sodium carbonate is added to the pulp until the pH value is 7.0-9.0, then 20g / t of sodium hexametaphosphate is added and stirred for 2min, 50g / t of OS is added and stirred for 2min, 1500g / t of salted water glass is added and stirred for 2min, 500g / t of lead nitrate is added and stirred for 2min, 800g / t of tungsten capture agent is added and stirred for 2min, and then mixed and fed into a flotation machine to obtain wolframite concentrate and wolframite tailings;

[0050] Step 3, Scheelite-Fluorite Flotation

[0051] The strong magnetic tailings are prepared into a slurry with a concentration of 30%, and 4kg / t of oxalic acid is added and stirred for 30 minutes, then 1kg / t of water glass is added and stirred for 2 minutes, and 1kg / t of capture agent LLR is added and stirred for 2 minutes, and then mixed and fed into a flotation machine to obtain scheelite-fluorite concentrate and co-floating tailings;

[0052] Step 4: Centrifugal re-selection

[0053] The scheelite-fluorite concentrate is concentrated to a concentration of 30%, and then subjected to "one coarse and three fine" centrifugal gravity separation to obtain scheelite concentrate and fluorite concentrate.

[0054] Example 2: In the above-mentioned mineral processing method, in order to accelerate the rapid mixing during the stirring process and prevent the minerals from gathering and settling at the bottom of the mixing tank during the mixing process, thereby affecting the subsequent mineral processing operations, the following improvements are made:

[0055] like Figure 2 As shown, the stirring process is completed in the mixing tank 100, and the mixing tank 100 is provided with a mounting plate 110, a fixed plate 120, and a medicine adding pipe 130. A horizontal plate 121 is provided on the top of the fixed plate 120, and the horizontal plate 121 extends to the middle position of the top of the mixing tank 100. A reduction motor 122 is installed on the horizontal plate 121, and a driving gear 123 is installed at the output end of the reduction motor 122. The mounting plate 110 is located in the mixing tank 100, and a mounting notch is provided in the middle of the mounting plate 110 and is installed. The groove wall of the groove is a spherical surface, and a sphere 111 is installed in the installation groove. A fixing hoop 112 is mounted on the outer side of the sphere 111, and the fixing hoop 112 is installed on the mounting plate 110. A symmetrically distributed connecting rod 113 and a connecting rod 2 114 are installed on the sphere 111. A gear plate 115 is installed at the end of the connecting rod 113 away from the sphere 111, and a stirring head 116 is installed at the end of the connecting rod 113 away from the sphere 111. The gear plate 115 is meshed with the driving gear 123 and the connecting rods are arranged obliquely.

[0056] The stirring head 116 is provided with a stirring body 117 on its side. The stirring body 117 is made of a flexible material or is rotatably mounted on the side of the stirring head 116 for mixing and stirring the dead corners in the mixing tank 100 .

[0057] The pharmaceutical mixing process:

[0058] A set amount of medicine is added through the medicine adding tube 130, and the reduction motor 122 drives the driving gear 123 to rotate. The driving gear 123 drives the meshing gear plate to rotate around the driving gear 123 while rotating on its own. The stirring head 116 mixes and stirs a large area at the bottom of the mixing tank 100, and at the same time drives the stirring body 117 to mix and stir the dead corners of the mixing tank 100.

[0059] Example 3: In the above-mentioned mineral processing method, in order to accelerate concentration and reduce operation time, the following improvements are made:

[0060] like Figures 3 to 5 As shown, the concentration operation is completed in a two-stage concentration tank, which is two concentration tanks 200 arranged in series, and the concentration tank 200 is provided with a feed port 201, a concentration port 202, and an overflow port 203. The concentration tank 200 is provided with an inclined baffle 204, and the bottom of the baffle 204 is arranged close to the feed port 201;

[0061] The bottom of the concentration tank 200 is a conical structure. A notch is provided at the bottom of the concentration tank 200. A polyurethane sealing strip 205 is installed at the notch. The polyurethane sealing strip 205 at the bottom cleans the surface of the deposition belt 209. A deposition conveying structure is provided outside the notch to convey the concentrated mineral particles to the concentration port 202.

[0062] As the concentration of slurry increases during the concentration process, the viscosity of the slurry increases, resulting in increased viscosity on the bottom wall of the concentration tank. The following improvements are made:

[0063] The deposition and conveying structure includes a motor group 206, a conveying roller 207 and a conveying roller 208 installed on the outer wall of the concentration tank 200. The output end of the motor group 206 is connected to the conveying roller 207. A deposition belt 209 is installed on the outer side of the conveying roller 207 and the conveying roller 208. The deposition belt 209 is made of anti-sticking and wear-resistant material and is not prone to short-term over-wear problems. A clamping member 210 is installed in the area between the conveying roller 207 and the conveying roller 208. The clamping member 210 runs through the interior of the deposition belt 209. The side of the clamping member 210 opposite to the notch is provided with clamping rollers 211 evenly distributed across the notch.

[0064] A vibration block 212 is disposed on the side of the baffle 204 facing away from the feed port 201 . The vibration frequency of the vibration block 212 is between 1-3 Hz and the amplitude is between 0.1-0.5 mm to prevent severe vibration from affecting the sedimentation effect.

[0065] The baffle 204 has evenly distributed horizontally arranged flow-uniform holes on its surface to reduce the surging degree of the internal slurry.

[0066] The concentration process is as follows:

[0067] Step 11, initial concentration

[0068] The slurry slowly enters the concentration tank 200 through the feed port 201, and the entering slurry is intercepted by the baffle 204 and initially concentrated. The concentration of the baffle 204 near the feed port 201 is greater than the concentration near the overflow port 203. At the same time, the flow-uniform hole performs horizontal flow uniformity on the slurry to avoid crosstalk and affect the concentration of the slurry at the bottom.

[0069] Step 12, deposition and delivery

[0070] The slurry on the side of the baffle 204 close to the feed port 201 enters the bottom of the concentration tank 200 for deposition and concentration. When the slurry is deposited and concentrated, the slurry particles are deposited on the deposition belt 209. The deposition belt 209 is directed to the concentration port 202 under the action of the motor group 206. The conveying speed is 10-20mm / min. A concentration sensor is provided at the concentration port 202. The concentration sensor and the switch valve at the concentration port 202 are connected via a PLC controller. The concentration signal collected by the concentration sensor is transmitted to the PLC controller. The PLC controller determines whether the setting meets the set threshold. If it meets the threshold, the switch valve is controlled to open the concentration port 202 to complete the concentration discharge.

[0071] Step 13, overflow secondary concentration

[0072] The slurry overflowing from the overflow port 203 enters the second concentration tank 200, and steps 11 and 12 are repeated. The overflow slurry is discharged after being treated to meet the discharge standards.

[0073] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. The replacement may be a replacement of a part of the structure, device, method step, or a complete technical solution. Any equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A beneficiation method for recovering tungsten from polymetallic tungsten ore tailings, characterized in that: include: Step 1: Strong magnetic separation The sulfide ore full float tailings are used as the raw ore, and the strong magnetic concentrate and strong magnetic tailings are obtained through 1.0-1.3 Tesla strong magnetic separation. Step 2, black tungsten flotation The strong magnetic concentrate is concentrated to a pulp with a concentration of 30%, and 500g / t of sodium carbonate is added to the pulp until the pH value is 7.0-9.0, then 20g / t of sodium hexametaphosphate is added and stirred for 2min, 50g / t of OS is added and stirred for 2min, 1500g / t of salted water glass is added and stirred for 2min, 500g / t of lead nitrate is added and stirred for 2min, 800g / t of tungsten capture agent is added and stirred for 2min, and then mixed and fed into a flotation machine to obtain wolframite concentrate and wolframite tailings; Step 3, Scheelite-Fluorite Flotation The strong magnetic tailings are prepared into a slurry with a concentration of 30%, and 4kg / t of oxalic acid is added and stirred for 30 minutes, then 1kg / t of water glass is added and stirred for 2 minutes, and 1kg / t of capture agent LLR is added and stirred for 2 minutes, and then mixed and fed into a flotation machine to obtain scheelite-fluorite concentrate and co-floating tailings; Step 4: Centrifugal re-selection The scheelite-fluorite concentrate is concentrated to a concentration of 30%, and then subjected to "one coarse and three fine" centrifugal gravity separation to obtain scheelite concentrate and fluorite concentrate.

2. A method for recovering tungsten from polymetallic tungsten ore tailings according to claim 1, characterized in that: The stirring process is completed in the mixing tank (100). The mixing tank (100) is provided with a mounting plate (110), a fixed plate (120), and a medicine adding pipe (130). A horizontal plate (121) is provided on the top of the fixed plate (120). The horizontal plate (121) extends to the middle position of the top of the mixing tank (100). A reduction motor (122) is installed on the horizontal plate (121). A driving gear (123) is installed at the output end of the reduction motor (122). The mounting plate (110) is located in the mixing tank (100). A mounting notch is provided in the middle of the mounting plate (110). The groove wall is a spherical surface, a sphere (111) is installed in the installation groove, a fixing hoop (112) is sleeved on the outer side of the sphere (111), the fixing hoop (112) is installed on the installation plate (110), and a symmetrically distributed connecting rod 1 (113) and a connecting rod 2 (114) are installed on the sphere (111), a gear plate (115) is installed at one end of the connecting rod 1 (113) away from the sphere (111), and a stirring head (116) is installed at one end of the connecting rod 2 (114) away from the sphere (111), the gear plate (115) and the driving gear (123) are meshed, and the connecting rods are arranged obliquely.

3. A method for recovering tungsten from polymetallic tungsten ore tailings according to claim 2, characterized in that: A stirring body (117) is installed on the side of the stirring head (116). The stirring body (117) is made of a flexible material or is rotatably installed on the side of the stirring head (116) and is used to mix and stir the dead corners in the mixing tank (100).

4. A method for recovering tungsten from polymetallic tungsten ore tailings according to claim 3, characterized in that: The pharmaceutical mixing process: A set amount of medicine is added through the medicine adding pipe (130), and the reduction motor (122) drives the driving gear (123) to rotate. The driving gear (123) drives the meshing gear plate to rotate around the driving gear (123) while rotating. The stirring head (116) mixes and stirs a large area at the bottom of the mixing tank (100), and at the same time drives the stirring body (117) to mix and stir the dead corners of the mixing tank (100).

5. A method for recovering tungsten from polymetallic tungsten ore tailings according to claim 1, characterized in that: The concentration operation is completed in a two-stage concentration tank, which is two concentration tanks (200) arranged in series, and the concentration tank (200) is provided with a feed port (201), a concentration port (202), and an overflow port (203). The concentration tank (200) is provided with an inclined baffle (204), and the bottom of the baffle (204) is arranged close to the feed port (201); The bottom of the concentration tank (200) is a conical structure. A notch is provided at the bottom of the concentration tank (200). A polyurethane sealing strip (205) is installed at the notch. A deposition and conveying structure is provided outside the notch for conveying concentrated mineral particles to the concentration port (202).

6. A method for recovering tungsten from polymetallic tungsten ore tailings according to claim 5, characterized in that: The deposition and conveying structure comprises a motor group (206), a conveying roller 1 (207) and a conveying roller 2 (208) installed on the outer wall of a concentration tank (200); the output end of the motor group (206) is connected to the conveying roller 1 (207); a deposition belt (209) is installed outside the conveying roller 1 (207) and the conveying roller 2 (208); a clamping member (210) is installed in the area between the conveying roller 1 (207) and the conveying roller 2 (208); the clamping member (210) runs through the interior of the deposition belt (209); and a clamping roller (211) evenly distributed across the notch is arranged on the side of the clamping member (210) opposite to the notch.

7. A method for recovering tungsten from polymetallic tungsten ore tailings according to claim 6, characterized in that: A vibration block (212) is provided on the side of the baffle (204) facing away from the feed inlet (201).

8. A method for recovering tungsten from polymetallic tungsten ore tailings according to claim 7, characterized in that: The baffle (204) has evenly distributed horizontally arranged flow-uniform holes on its surface.

9. A method for recovering tungsten from polymetallic tungsten ore tailings according to claim 8, characterized in that: The concentration process is as follows: Step 11, initial concentration The ore pulp slowly enters the concentration tank (200) through the feed port (201), and the entering ore pulp is intercepted by the baffle (204) to be initially concentrated. The concentration of the baffle (204) near the feed port (201) is greater than the concentration near the overflow port (203). At the same time, the flow-uniform hole performs horizontal flow uniformity on the ore pulp to avoid crosstalk and affect the concentration of the ore pulp at the bottom. Step 12, deposition and delivery The ore slurry on the side of the baffle (204) close to the feed port (201) enters the bottom of the concentration tank (200) for sedimentation and concentration. When the ore slurry is deposited and concentrated, the ore slurry particles are deposited on the sedimentation belt (209). The sedimentation belt (209) is directed to the concentration port (202) under the action of the motor group (206). The conveying speed is 10-20 mm / min. A concentration sensor is provided at the concentration port (202). The concentration sensor and the switch valve at the concentration port (202) are connected via a PLC controller. The concentration signal collected by the concentration sensor is transmitted to the PLC controller. The PLC controller determines whether the setting meets the set threshold. If it meets the setting, the switch valve is controlled to open the concentration port (202) to complete the concentration discharge. Step 13, overflow secondary concentration The ore pulp overflowing from the overflow port (203) enters the second concentration tank (200), and steps 11 and 12 are repeated. The overflow ore pulp is discharged after being treated to meet the discharge standards.

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