A beneficiation method for recovering tungsten from polymetallic tungsten tailings

Abstract

The application discloses a beneficiation method for recovering tungsten from polymetallic tungsten tailings, and is characterized by comprising the following steps: obtaining strong magnetic concentrate and strong magnetic tailings through strong magnetic separation; concentrating the strong magnetic concentrate to a slurry with a concentration of 30%, adding sodium carbonate to the slurry to make the pH value of the slurry reach 7.0-9.0, then adding sodium hexametaphosphate, OS, salted water glass, lead nitrate and a tungsten capturing agent, and then feeding the mixture into a flotation machine to obtain wolframite concentrate and wolframite tailings; adjusting the strong magnetic tailings to a slurry with a concentration of 30%, adding oxalic acid, water glass and a capturing agent LLR to the slurry, and then feeding the mixture into a flotation machine to obtain scheelite-fluorite concentrate and co-floating tailings; and concentrating the scheelite-fluorite concentrate to a slurry with a concentration of 30%, and then performing 'one roughing and three cleaning' centrifugal gravity separation to obtain scheelite concentrate and fluorite concentrate. Under the acid condition, the flotation effect of the fluorite is enhanced, the interference on the scheelite flotation is reduced as much as possible, and the recovery rate and grade of the wolframite concentrate and the scheelite concentrate are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mineral processing, and particularly relates to a mineral processing method for recovering tungsten from a multi-metal tungsten tailing. BACKGROUND

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

[0003] Black and white tungsten paragenetic ore is a refractory ore, and is often associated with fluorite, calcite and tremolite rich in calcium and magnesium. In order to inhibit these gangues, a large amount of inhibitors needs to be added because the surface properties of these gangues are similar to those of scheelite. Commonly used inhibitors include water glass, sodium hexametaphosphate, sodium fluorosilicate and carboxymethyl cellulose. In the mixed flotation of black and white tungsten paragenetic ore, the addition of lead nitrate helps to enhance the collecting ability of the chelating agent for white tungsten ore and black tungsten ore and reduce the dosage of the collector. The collector used in the mixed flotation of black and white tungsten paragenetic ore is generally a fatty acid collector, a chelating collector or a combination of a fatty acid collector and a chelating collector. In the process flow of the mineral processing of black and white tungsten paragenetic ore, it is particularly important to select a suitable process flow, which is also the key to achieving good technical indexes of mineral processing.

[0004] After searching, it is found that CN113369005A discloses a mineral processing method for mixed refractory tungsten ore, which comprises the following steps: 1, obtaining a slurry by grinding the broken black and white tungsten paragenetic ore; 2, adding inhibitors, activator lead nitrate and collectors to the slurry with a pH value of 7.0-9.0 to perform mixed tungsten roughing to obtain a tungsten rough concentrate slurry and a roughing tailing slurry; 3, performing two mixed tungsten scavenging operations on the roughing tailing slurry to obtain tungsten scavenging tailings I; 4, performing weak magnetic iron removal on the tungsten rough concentrate slurry to obtain a magnetic iron product and a magnetic tailing slurry; 5, performing strong magnetic roughing and scavenging on the magnetic tailing slurry to obtain a black tungsten concentrate product and a scavenging tailing; 6, performing thickening and dewatering on the scavenging tailing to obtain a slurry with a concentration of 60%-70%; and 7, performing white tungsten flotation on the slurry with a concentration of 60%-70% to obtain a white tungsten concentrate and tungsten scavenging tailings II. The technology ignores the oxidation of the raw ore, which leads to the denaturation of the surface of white tungsten and the tailing running in the flotation, thereby reducing the recovery rate of white tungsten. SUMMARY

[0005] The technical problem to be solved by the present application is that the oxidation of the raw ore in the existing mineral processing process leads to the denaturation of the surface of white tungsten and the tailing running in the flotation, thereby reducing the recovery rate of white tungsten.

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

[0007] A mineral processing method for recovering tungsten from a multi-metal tungsten tailing, comprising:

[0008] Step 1, strong magnetic separation

[0009] The strong magnetic concentrate and the strong magnetic tailings are obtained by strong magnetic separation of the whole flotation tailings of sulfide ore with particle size of 80%-95% of -74μm;

[0010] Step 2, wolframite flotation

[0011] The strong magnetic concentrate is concentrated to a slurry with a concentration of 30%, and 500g / t of sodium carbonate is added to the slurry to adjust the pH value to 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, and 800g / t of tungsten capture agent is added and stirred for 2min, and then the mixture is fed into a flotation machine to obtain wolframite concentrate and wolframite tailings.

[0012] Step 3, scheelite-fluorite flotation

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

[0014] Step 4, centrifugal gravity separation

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

[0016] Preferably, the stirring process is completed in a mixing tank, and a mounting plate and a fixed plate, a medicament adding pipe are arranged on the mixing tank, a horizontal plate is arranged on the top of the fixed plate and extends to the middle position of the top of the mixing tank, a reduction motor is mounted on the horizontal plate, a drive gear is mounted on the output end of the reduction motor, the mounting plate is located in the mixing tank, a mounting slot is arranged in the middle of the mounting plate and the slot wall of the mounting slot is a spherical surface, a ball is mounted in the mounting slot, a fixed collar is sleeved on the outside of the ball, the fixed collar is mounted on the mounting plate, symmetrically distributed connecting rod one and connecting rod two are mounted on the ball, a gear disc is mounted on the end of the connecting rod one away from the ball, a stirring head is mounted on the end of the connecting rod two away from the ball, the gear disc is engaged with the drive gear, and the connecting rods are inclinedly arranged.

[0017] Preferably, a stirring body is mounted on the side of the stirring head, the stirring body is made of flexible material or is rotatably mounted on the side of the stirring head, and is used for mixing the dead angle in the mixing tank.

[0018] Preferably, the medicament mixing process comprises the following steps:

[0019] The medicament is added into the setting amount through the medicament adding pipe, the deceleration motor drives the driving gear to rotate, the driving gear drives the meshed gear plate to rotate while self-rotating around the driving gear, the stirring head mixes and stirs in a large range at the bottom of the mixing tank, and the stirring body is driven to mix and stir the dead angle of the mixing tank.

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

[0021] The bottom of the concentration tank is in a conical structure, the bottom of the concentration tank is provided with an opening, a polyurethane sealing strip is installed at the opening, and a deposition conveying structure is arranged outside the opening to convey the concentrated mineral particles to the concentration outlet.

[0022] Preferably, the deposition conveying structure comprises a motor set installed on the outer wall of the concentration tank, a conveying roller one and a conveying roller two, the motor set is connected to the conveying roller one in output, the conveying roller one and the conveying roller two are provided with a deposition belt outside, a pressing piece is installed between the conveying roller one and the conveying roller two, the pressing piece penetrates the inside of the deposition belt, and the pressing piece is provided with pressing rollers distributed uniformly across the opening on the side opposite to the opening.

[0023] Preferably, the side of the baffle opposite to the inlet is provided with a vibrating block.

[0024] Preferably, the surface of the baffle is uniformly provided with horizontally arranged uniform flow holes.

[0025] Preferably, the concentration operation process is as follows:

[0026] Step 11, preliminary concentration

[0027] The ore pulp slowly enters the concentration tank through the inlet, the entering ore pulp is intercepted by the baffle to obtain preliminary concentration, the concentration close to the inlet side of the baffle is greater than the concentration close to the overflow outlet, and the uniform flow holes horizontally uniformly flow the ore pulp to avoid disturbance and affect the concentration of the ore pulp at the bottom.

[0028] Step 12, deposition conveying

[0029] The baffle near the feed inlet side deposits the ore pulp into the bottom of the thickening tank for thickening, when the ore pulp is deposited and thickened, the ore pulp particles are deposited on the deposition zone, the deposition zone is oriented to the thickening port under the action of the motor set, the conveying speed is 10-20 mm / min, a concentration sensor is arranged at the thickening port, the concentration sensor and the on-off valve at the thickening port are connected through a PLC controller, the concentration signal collected by the concentration sensor is transmitted to the PLC controller, the PLC controller judges whether the concentration signal meets the set threshold value, if yes, the on-off valve is controlled to open the thickening port, and the thickening and discharging are completed;

[0030] Step 13, overflow secondary thickening

[0031] The ore pulp overflowing through the overflow port enters the second thickening tank, and steps 11 and 12 are repeated, and the overflowed ore pulp is discharged after meeting the discharge standard.

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

[0033] 1. The present application uses sulfide ore tailings as raw material (containing 0.43% tungsten) to obtain strong magnetic concentrate and strong magnetic tailings through strong magnetic separation, and then carries out thickening operation on the strong magnetic concentrate, obtains black tungsten concentrate through flotation of black tungsten, the grade is 67.27%, and the cumulative recovery rate is 22.06%, then carries out white tungsten-fluorite flotation operation to obtain white tungsten-fluorite concentrate, and then carries out centrifugal gravity separation to obtain white tungsten concentrate, the grade is 17.96%, and the cumulative recovery rate is 20.42%, so that the recovery rate and grade of black tungsten concentrate and white tungsten concentrate are improved.

[0034] 2. In the white tungsten-fluorite flotation, under the acidic condition, oxalic acid can more effectively react with the metal ions on the surface of fluorite to form a stable complex, which helps to enhance the hydrophobicity of fluorite particles, making them more easily captured by the flotation agent and floated to the surface of the ore pulp. The flotation effect of fluorite is enhanced, and the interference on the flotation of white tungsten ore is minimized.

[0035] 3. The present application is improved for the thickening tank, in order to accelerate the thickening process and improve the thickening efficiency to realize rapid thickening, because the concentration of the bottom concentration layer is high, the viscosity of the ore pulp gradually increases with the increase of the concentration, and it is easy to stick to the inner wall of the bottom, so cleaning operation is needed after each thickening, which makes it impossible to complete continuous thickening operation. A downward conveying receiving belt is added in the thickening tank, which is used to accelerate the mineral thickening and avoid the sticking of the mineral to the inner wall of the bottom.

[0036] 4. The present application also improves the mixing tank, which uses the mixing head to mix and stir in a large range at the bottom of the mixing tank, realizes rapid and uniform mixing, and avoids mixing dead angles and ore pulp settlement on the inner side, which affects the beneficiation grade and recovery rate. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 A beneficiation process schematic diagram of the present application;

[0038] Figure 2 A structural distribution diagram in the mixing tank of the present application;

[0039] Figure 3 A structural schematic diagram of the two-stage thickening tank of the present application;

[0040] Figure 4 A structural schematic diagram of the intermediate deposition conveying structure; Figure 3

[0041] A structural schematic diagram of the intermediate deposition conveying structure; Figure 5 Figure 4 A side view of the thickening tank. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0043] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0044] Embodiment 1

[0045] As shown in the figure, a beneficiation method for recovering tungsten from a polymetallic tungsten ore tailing, comprising: Figure 1

[0046] Step 1, strong magnetic separation

[0047] With sulfide ore full-flotation tailings as raw ore, strong magnetic separation is carried out at 1.0-1.3 Tesla to obtain strong magnetic concentrate and strong magnetic tailings;

[0048] Step 2, wolframite flotation

[0049] The strong magnetic concentrate is thickened to a slurry concentration of 30%, and 500g / t of sodium carbonate is added to the slurry to a pH value of 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 the mixture is fed into a flotation machine to obtain wolframite concentrate and wolframite tailings;​​

[0050] Step 3, Scheelite-fluorite flotation

[0051] The strong magnetic tailings are mixed with the slurry with a concentration of 30% and 4 kg / t of oxalic acid is added and stirred for 30 min, then 1 kg / t of sodium silicate is added and stirred for 2 min, 1 kg / t of the capturing agent LLR is added and stirred for 2 min, and then the mixture is fed into the flotation machine to obtain scheelite-fluorite concentrate and co-flotation tailings.

[0052] Step 4, centrifugal reselection

[0053] The scheelite-fluorite concentrate is concentrated to a concentration of 30% and then subjected to "one roughing and three cleaning" centrifugal reselection to obtain scheelite concentrate and fluorite concentrate.

[0054] In the beneficiation method described above, in order to accelerate the realization of rapid mixing while preventing the settlement of minerals at the bottom of the mixing tank during the stirring process, which affects the subsequent beneficiation operation, the following improvements are made:

[0055] As shown in Figure 2 the stirring process is completed in the mixing tank 100, a mounting plate 110 and a fixed plate 120 are arranged on the mixing tank 100, a medicament adding pipe 130 is arranged, the top of the fixed plate 120 is provided with a horizontal plate 121 extending to the middle position of the top of the mixing tank 100, a reduction motor 122 is installed on the horizontal plate 121, a drive 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 slot is arranged in the middle of the mounting plate 110 and the slot wall of the mounting slot is a spherical surface, a ball 111 is installed in the mounting slot, a fixed collar 112 is sleeved on the outside of the ball 111, the fixed collar 112 is installed on the mounting plate 110, symmetrically distributed connecting rod one 113 and connecting rod two 114 are installed on the ball 111, a gear disc 115 is installed at the end of the connecting rod one 113 away from the ball 111, a stirring head 116 is installed at the end of the connecting rod two 114 away from the ball 111, the gear disc 115 is engaged with the drive gear 123 and the connecting rods are arranged obliquely.

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

[0057] The medicament mixing process is as follows:

[0058] The medicine is added into the setting amount through the medicine adding pipe 130, the deceleration motor 122 drives the driving gear 123 to rotate, the driving gear 123 drives the meshed gear plate to rotate while rotating around the driving gear 123, the stirring head 116 is mixed and stirred in a large range at the bottom of the mixing tank 100, and the stirring body 117 is driven to mix and stir the dead angle of the mixing tank 100.

[0059] In the beneficiation method described above, in order to accelerate the concentration and reduce the operation time, the following improvements are made:

[0060] As shown in Figures 3 to 5 The concentration operation is completed in the two-stage concentration tank, and the two-stage concentration tank is two concentration tanks 200 arranged in series. The concentration tank 200 is provided with a feed inlet 201, a concentration outlet 202 and an overflow outlet 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 inlet 201.

[0061] The bottom of the concentration tank 200 is in a conical structure, and the bottom of the concentration tank 200 is provided with an opening. A polyurethane sealing strip 205 is installed at the opening. The polyurethane sealing strip 205 at the bottom scrapes the surface of the deposition belt 209. A deposition conveying structure is arranged outside the opening to convey the concentrated mineral particles to the concentration outlet 202.

[0062] Due to the increase of the concentration of the ore pulp during the concentration process, the viscosity of the ore pulp is enhanced, which causes the adhesion of the ore pulp to the side wall of the bottom of the concentration tank to be enhanced. The following improvements are made:

[0063] The deposition conveying structure includes a motor set 206, a conveying roller one 207 and a conveying roller two 208 installed on the outer wall of the concentration tank 200. The output end of the motor set 206 is connected with the conveying roller one 207. The conveying roller one 207 and the conveying roller two 208 are provided with a deposition belt 209 outside. The deposition belt 209 is made of anti-sticking and wear-resistant material, and is not easy to be abraded in a short time. A pressing member 210 is arranged between the conveying roller one 207 and the conveying roller two 208. The pressing member 210 penetrates the inside of the deposition belt 209. The pressing member 210 is provided with a pressing roller 211 which is uniformly distributed and crosses the opening on one side of the pressing member 210.

[0064] The side of the baffle 204 opposite to the feed inlet 201 is provided with a vibrating block 212. The vibration frequency of the vibrating block 212 is between 1-3Hz, and the amplitude is between 0.1-0.5mm. The vibrating block 212 prevents the violent vibration from affecting the sedimentation effect.

[0065] The surface of the baffle 204 is uniformly provided with horizontally arranged uniform flow holes to reduce the degree of internal ore pulp turbulence.

[0066] The concentration operation process is as follows:

[0067] Step 11, preliminary concentration

[0068] 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 obtain preliminary concentration. The concentration near the feed port 201 side of the baffle 204 is greater than the concentration near the overflow port 203, and the uniform flow holes perform horizontal uniform flow on the ore pulp to avoid turbulence and affect the concentration of the bottom ore pulp.

[0069] Step 12, sedimentary delivery

[0070] The ore pulp near the feed port 201 side of the baffle 204 enters the bottom of the concentration tank 200 for sedimentary concentration. When the ore pulp is sedimentary concentrated, the ore pulp particles are deposited on the sedimentation zone 209, which is delivered to the concentration port 202 under the action of the motor set 206 at a delivery speed of 10-20 mm / min. The concentration sensor is arranged at the concentration port 202, and the concentration sensor and the on-off valve at the concentration port 202 are connected through the PLC controller. The concentration signal collected by the concentration sensor is transmitted to the PLC controller, and the PLC controller judges whether it meets the set threshold value. If it meets, the on-off valve is controlled to open the concentration port 202, and the concentration and discharge are completed.

[0071] Step 13, overflow secondary concentration

[0072] The ore pulp overflowed through the overflow port 203 enters the second concentration tank 200, and steps 11 and 12 are repeated. The overflowed ore pulp is discharged after meeting the discharge standard.

[0073] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. The alternatives can be partial structure, device, method step alternatives, or complete technical solutions. According to the technical solutions and inventive concepts of the present application, equivalent replacement or change should be covered within the protection scope of the present application.

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, Wolframite 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 2 minutes, 50g / t of OS is added and stirred for 2 minutes, 1500g / t of salted water glass is added and stirred for 2 minutes, 500g / t of lead nitrate is added and stirred for 2 minutes, and 800g / t of tungsten scavenger is added and stirred for 2 minutes. After mixing, it is 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 scavenger LLR is added and stirred for 2 minutes. After mixing, the mixture is fed into the flotation machine to obtain scheelite-fluorite concentrate and co-floating tailings; Step 4: Centrifugal reselection 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; The concentration operation is completed in a two-stage concentration tank, which is composed of two concentration tanks (200) arranged in series. The concentration tank (200) is provided with a feed port (201), a concentration port (202), and an overflow port (203). An inclined baffle (204) is provided in the concentration tank (200), 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).

2. The ore dressing 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 drug 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 (113) and a connecting rod (114) are installed on the sphere (111), a gear plate (115) is installed on the end of the connecting rod (113) away from the sphere (111), and a stirring head (116) is installed on the end of the connecting rod (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. The ore dressing 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. The 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) rotates and 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. The ore dressing method for recovering tungsten from polymetallic tungsten ore tailings according to claim 4, characterized in that: The deposition conveying structure comprises a motor group (206), a conveying roller 1 (207) and a conveying roller 2 (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 1 (207); a deposition belt (209) is installed on the outer side of the conveying roller 1 (207) and the conveying roller 2 (208); a tightening member (210) is installed in the area between the conveying roller 1 (207) and the conveying roller 2 (208); the tightening member (210) runs through the interior of the deposition belt (209); and a tightening roller (211) evenly distributed across the notch is provided on the side of the tightening member (210) opposite to the notch.

6. A beneficiation method for recovering tungsten from polymetallic tungsten ore tailings according to claim 5, characterized in that: A vibration block (212) is provided on the side of the baffle (204) facing away from the feed inlet (201).

7. A beneficiation method for recovering tungsten from polymetallic tungsten ore tailings according to claim 6, characterized in that: Horizontally arranged flow-uniform holes are evenly distributed on the surface of the baffle (204).

8. The method for recovering tungsten from polymetallic tungsten ore tailings according to claim 7, characterized in that: The concentration process is as follows: Step 11, initial concentration 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 on the side of the baffle (204) close to the feed port (201) is greater than the concentration on the side close to the overflow port (203). At the same time, the uniform flow holes uniformly flow the slurry horizontally to avoid crosstalk that affects the concentration of the slurry at the bottom. Step 12: Deposition and delivery The 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 slurry is deposited and concentrated, the slurry particles are deposited on the sedimentation belt (209). The sedimentation belt (209) is transported to the concentration port (202) in a direction under the action of the motor group (206). The transport 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 threshold, the switch valve is controlled to open the concentration port (202) to complete the concentration discharge. Step 13, overflow secondary concentration 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.

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