A method for recovering wolframite from argillaceous tungsten polymetallic ore

Abstract

The present invention belongs to the technical field of wolframite beneficiation, and particularly relates to a method for recovering wolframite from muddy tungsten polymetallic ore. The method removes magnetite and discards tailings through a single coarse beneficiation, resulting in a high-grade magnetite and negligible wolframite and magnetite content in the tailings. After concentration, the wolframite is centrifugally separated in a centrifugal concentrator. The wolframite is of high grade and has a considerable recovery rate. Targeted improvements are made to the concentrator. To accelerate the concentration process, improve concentration efficiency, and achieve rapid concentration, a downward directional conveying belt is provided in the concentrator to accelerate sedimentation and reduce viscosity, significantly enhancing the concentration effect.

Description

Technical Field

[0001] The invention belongs to the technical field of wolframite beneficiation, and in particular relates to a method for recovering wolframite from muddy tungsten polymetallic ore. Background Art

[0002] Wolframite, with its chemical composition of (Fe, Mn)WO4, is a monoclinic oxide mineral. Its mineral and streak color vary with the iron and manganese content, generally ranging from brownish-red to black, with streaks ranging from yellowish-brown to dark brown. It has a metallic to semi-metallic luster and exhibits a complete set of plate-like cleavage. Wolframite also has a specific gravity of 7.2-7.5, a Mohs hardness of 4-4.5, and is generally weakly magnetic.

[0003] Existing polymetallic mud ores require multiple magnetic separations to remove magnetite and non-magnetic tailings during recovery and beneficiation, which makes the production line lengthy and the process more complicated. The cost often outweighs the benefits, that is, the production cost is greater than the sales price of the ore. Therefore, it is necessary to develop a process method that uses a simple magnetic separation process to ensure the grade of wolframite and achieve efficient recovery. Summary of the Invention

[0004] The technical problems to be solved by the present invention are:

[0005] How to efficiently recover wolframite from polymetallic mud mines.

[0006] In order to solve the above technical problems, the inventors have come up with the technical solution of the present invention through practice and summary. The magnetite is removed and the tailings are discarded through a rough concentration. The grade of magnetite is high, and the wolframite and magnetite in the tailings can be basically ignored. After concentration, the wolframite is centrifuged in a centrifugal concentrator to separate the wolframite. The wolframite has a high grade and a considerable recovery rate. The technical solution is as follows:

[0007] A method for recovering wolframite from argillaceous tungsten polymetallic ore by mineral processing, comprising:

[0008] Step 1, Grinding

[0009] Grind the raw ore to obtain 80%-95% by weight of mud ore with a particle size of -74μm, and mix the mud ore into 30% ore pulp;

[0010] Step 2: Magnetic separation of magnetite

[0011] The ore pulp is subjected to weak magnetic roughing with a magnetic field strength of 4000 Gauss to obtain magnetic roughing concentrate, magnetic roughing tailings, and magnetic roughing ore;

[0012] Step 3: Magnetic separation of wolframite

[0013] The ore from the magnetic roughing is separated by a strong magnetic separation of 1.0-1.3 Tesla to obtain weak magnetic separation ore and demagnetized tailings;

[0014] The weak magnetic separation minerals are subjected to shaking table gravity separation to obtain wolframite concentrate I and gravity separation tailings. The gravity separation tailings are subjected to one coarse and two fine centrifugal gravity separation to obtain wolframite concentrate II and wolframite centrifuge tailings. Wolframite concentrate I and wolframite concentrate II are used as target wolframite concentrates.

[0015] During production, it is necessary to concentrate the wolframite before centrifugation to ensure the recovery rate and grade of the mineral. Traditional concentration often only uses the sedimentation effect to achieve concentration. Due to the small particle size of the mud ore, it cannot be quickly settled, resulting in unsatisfactory sedimentation efficiency. In step 3, the gravity separation tailings are first concentrated and then enter the centrifugal concentrator. The concentration adopts a two-stage concentration device, which includes two concentration tanks arranged in series.

[0016] The concentration tank includes a feed port, a concentration port and an overflow port. A conical structure is provided at the bottom of the concentration tank. Notches are provided on both sides of the conical structure. Polyurethane sealing strips are installed around the notches. A driver and a driven roller are installed on the side of the concentration tank. An active transmission roller is installed at the output end of the driver. A receiving belt is wound around the active transmission roller and the driven roller. An abutment is installed in the area between the active transmission roller and the driven roller. A plurality of abutment rollers are provided on the abutment. The abutment rollers are used to squeeze the receiving belt on the outside of the notch.

[0017] The weak magnetic separation minerals first enter the buffer tank before entering the concentration tank, which receives and stores the slurry or water flow from the upstream process, and plays a role in regulating the flow. When the slurry flow of the upstream process is too large or unstable, the buffer tank can absorb these excess flows and smoothly release the flow to the downstream process when needed, thereby ensuring the stable operation of the entire mineral processing system. A mounting plate and a fixed plate are installed in the buffer tank, and a connecting ball is rotatably installed on the mounting plate. A connecting rod 1 is installed on the top of the connecting ball, and a stirring head is installed on the bottom. A slave gear is installed on the top of the connecting rod 1, and multiple stirring rods are hinged on the stirring head. The fixed plate is installed on the side top of the buffer tank, and a drive motor is installed on the fixed plate. A main gear is installed on the output end of the drive motor. The main gear and the slave gear are meshed, and the slave gear rotates while making circumferential motion around the periphery of the main gear.

[0018] Preferably, the weak magnetic roughing adopts a magnetic separator, which includes a magnetic separation box, a feeding trough and an unloading trough. An arc-shaped magnetic separation trough is arranged in the magnetic separation box, and a magnetic separation drum is installed on the magnetic separation box. A transmission shaft is installed at one end of the magnetic separation drum and a bearing seat 1 is matched with the outer side, and the other end is a shaft ring and a roller support seat is abutted at the lower side of the outer side of the shaft ring. The bearing seat 1 and the roller support seat are both installed on the magnetic separation box, and a permanent magnet group is horizontally eccentrically arranged in the magnetic separation drum. A maximum field strength position and a minimum field strength position are formed on the magnetic separation drum. One end of the permanent magnet group is rotatably mounted on the inner side of one end of the transmission shaft of the magnetic separation drum through an eccentric disk, and the other end extends to the outer side of the shaft ring and is equipped with a bearing seat 2. The bearing seat 2 is installed on the magnetic separation box, and two reduction motors are installed on the magnetic separation box. The two reduction motors are respectively located on both sides of the magnetic separation box, and the two reduction motors are respectively used to drive the magnetic separation drum and the permanent magnet group;

[0019] The feed chute is set above the side of the maximum field strength position, and the unloading chute is set below the side of the minimum field strength position;

[0020] A magnetic separation channel is formed between the arc-shaped magnetic separation tank and the magnetic separation drum;

[0021] There are two unloading ports on the arc-shaped magnetic separation tank, which are symmetrically distributed on both sides of the arc-shaped magnetic separation tank. The two unloading ports are the tailings port and the middling port respectively.

[0022] Preferably, an adjustable switch plate is installed at the ore unloading port.

[0023] Preferably, a magnetic isolation plate is installed on the eccentric disk, the bottom of the magnetic isolation plate covers the maximum field strength position and is higher than the top of the ore unloading chute, a top support rod is provided between the magnetic isolation plate and the permanent magnet group, and the end of the magnetic isolation plate away from the eccentric disk extends to the outside of the magnetic separation drum through the connecting plate and is fixed on the magnetic separation box.

[0024] Preferably, lifting plates are provided on both sides of the magnetic separation box, and the lifting plates are used to install the first bearing seat, the second bearing seat and the reduction motor;

[0025] A guide rod is fixedly installed at the bottom of the lifting plate, and the guide rod is vertically slidably fitted on the magnetic separation box;

[0026] An upper adjusting block is installed at the bottom of the lifting plate, and a lower adjusting block is correspondingly arranged below the upper adjusting block. The lower adjusting block is horizontally installed on the magnetic separation box. Horizontal guide rails are independently installed on both sides of the lower adjusting block, and the horizontal guide rails are fixedly installed on the magnetic separation box. A fine-thread top shaft is installed on one side of the lower adjusting block, and the fine-thread top shaft is threadedly connected to the magnetic separation box. The fine-thread top shaft is used to push and pull the lower adjusting block horizontally.

[0027] Preferably, a groove is provided on the bottom surface of the lower adjustment block, a backstop plate is provided in the area between the two horizontal guide rails, the backstop plate and the groove are positioned correspondingly, a vertical groove is provided on the lower adjustment block, a slider is slidably fitted in the vertical groove, and a spring is installed at the bottom of the slider, a slide groove is provided on the slider, the bottom of the slide groove is obliquely arranged downward and gradually approaches the fine thread top shaft, and a connecting pin is slidably fitted in the slide groove;

[0028] A through slot is provided on one side of the lower adjustment block relative to the fine thread top shaft. The fine thread top shaft is connected and fixed with a connecting pin through the through slot. An elastic locking block is provided at the bottom of the slider.

[0029] Preferably, the vertical slot is a stepped hole that is larger at the top and smaller at the bottom, and is divided into an upper mounting area and a lower guide area.

[0030] Preferably, the elastic locking block includes a mounting groove arranged at the bottom of the slider, a spring body and a T-shaped block are installed in the mounting groove, the top of the T-shaped block slides and fits in the inner side of the mounting groove and the top surface abuts against the bottom end of the spring body, a limit block is installed at the bottom of the mounting groove, the limit block is mounted on the outer side of the T-shaped block, an anti-retreat plate is provided at the bottom of the T-shaped block, and one-way ratchets are provided on the opposite sides of the anti-retreat plate and the stop plate.

[0031] Preferably, the slurry is fed from the feed trough to the magnetic separation drum and then enters the arc-shaped magnetic separation tank. A horizontally offset permanent magnet group is provided inside the magnetic separation drum. A maximum field strength position and a minimum field strength position are formed on the magnetic separation drum. The feed position is located above one side of the magnetic separation drum at the maximum field strength position.

[0032] The magnetic material in the slurry is adsorbed on the magnetic separation drum, and the slurry is then fed to the magnetic separation drum for a second time through the feeding arc plate;

[0033] The slurry rotates around the axes of the magnetic separation drum and the internal permanent magnet group. The permanent magnet group consists of multiple alternating N and S poles. The magnetic material rolls on the surface of the magnetic separation drum and is transported to the unloading chute.

[0034] The magnetic roughing tailings are flushed by water in the arc-shaped magnetic separation tank and discharged through the tailings outlet. The magnetic roughing concentrate continues to pass through the bottom area of ​​the arc-shaped magnetic separation tank and is flushed by water, and the magnetic roughing concentrate is discharged through the middling outlet.

[0035] The magnetic material still adsorbed on the magnetic separation drum is discharged through the unloading chute, which is located below the side of the magnetic separation drum at the minimum field strength position;

[0036] When the fine-thread top shaft moves the lower adjustment block horizontally toward the upper adjustment block, it moves upward along the slide slot via the connecting pin, and moves the slider downward to compress the spring member, so that the elastic locking block fits on the anti-retraction plate, thereby preventing the lower adjustment block from retreating;

[0037] When the fine-thread top shaft moves the lower adjusting block horizontally away from the upper adjusting block, it moves down the slide groove through the connecting pin and moves the slider upward, and the spring part resets, so that the elastic locking block and the backstop plate are released from the adaptation state.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The present invention can select magnetic concentrate by a single magnetic separation. The internal horizontal eccentric permanent magnetic group forms a maximum field strength position and a minimum field strength position on the magnetic separation drum. The maximum field strength position is used to adsorb the slurry fed by the feed trough at the first time. The internal permanent magnetic group is used to rotate around its own axis. The surface of the permanent magnetic group is spaced with N poles and S poles, so that the adsorbed minerals continuously roll toward the unloading trough on the magnetic separation drum, repeatedly breaking up the agglomeration, separating the non-magnetic minerals in the agglomeration, and washing them with water in the magnetic separation drum and the arc-shaped magnetic separation trough. The non-magnetic minerals are discharged through the tailings port and enter the high-intensity magnetic separator. (1.0-1.3 Tesla magnetic field strength), the adsorbed magnetic minerals and the remaining non-magnetic and very weak magnetic minerals move to the middle ore port through the bottom of the arc-shaped magnetic separation tank, and are also washed once in the process. As the magnetic field becomes smaller, a concentration operation will be completed in this process. The magnetic minerals will still be adsorbed on the magnetic separation drum and continue to move to the unloading chute, and the concentrate will be unloaded in the unloading chute. The weak magnetic and very weak magnetic minerals will be discharged at the middle ore port and then enter the strong magnetic separator (1.0-1.3 Tesla magnetic field strength), thereby realizing the completion of roughing and concentrating operations by a single magnetic separation equipment, greatly saving production costs and shortening the mineral processing process.

[0040] 2. The weak magnetic and very weak magnetic of the present invention are used to roughly select the wolframite by a strong magnetic separator. The roughly selected wolframite crude ore is concentrated and centrifuged multiple times to obtain the wolframite concentrate. The grade and recovery rate of the wolframite recovered by this method are improved.

[0041] 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. After each concentration, a cleaning operation is required, 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.

[0042] 4. The present invention sets a stirring structure in the buffer tank, and uses the stirring structure to maintain the uniformity of the slurry, thereby avoiding precipitation at this location and affecting the recovery rate of black tungsten. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the process for recovering wolframite according to the present invention;

[0044] Figure 2 It is the internal structure diagram of the magnetic separator of the present invention;

[0045] Figure 3 is a transverse cross-sectional view of the magnetic separator of the present invention;

[0046] Figure 4 for Figure 3 A partial enlarged view of point A in the middle;

[0047] Figure 5 for Figure 4 Structural diagram of the middle elastic locking block;

[0048] Figure 6 A side view of the magnetic separation drum of the present invention, which is away from the corresponding driver;

[0049] Figure 7 It is a schematic diagram of the structure inside the buffer tank of the present invention;

[0050] Figure 8 Schematic diagram of the internal structure of the concentration tank of the present invention;

[0051] Figure 9 for Figure 8 Side view of the concentrator tank. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention will be clearly and completely described 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.

[0053] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0054] Example 1, as Figure 1 As shown, a method for recovering wolframite from argillaceous tungsten polymetallic ore by beneficiation comprises:

[0055] Step 1, Grinding

[0056] Grind the raw ore to obtain 80%-95% by weight of mud ore with a particle size of -74μm, and mix the mud ore into 30% ore pulp;

[0057] Step 2: Magnetic separation of magnetite

[0058] The ore pulp is subjected to weak magnetic roughing with a magnetic field strength of 4000 Gauss to obtain magnetic roughing concentrate, magnetic roughing tailings, and magnetic roughing ore;

[0059] Step 3: Magnetic separation of wolframite

[0060] The ore from the magnetic roughing is separated by a strong magnetic separation of 1.0-1.3 Tesla. The strong magnetic separation uses a strong magnetic separator 200 to obtain weak magnetic separation ore and demagnetized tailings.

[0061] The weak magnetic separation minerals are subjected to shaking table gravity separation to obtain wolframite concentrate I and gravity separation tailings. The gravity separation tailings are subjected to one coarse and two fine centrifugal gravity separation to obtain wolframite concentrate II and wolframite centrifuge tailings. Wolframite concentrate I and wolframite concentrate II are used as target wolframite concentrates.

[0062] In step 3, the gravity separation tailings are first concentrated and then enter the centrifugal concentrator 500. The concentration adopts the secondary concentration equipment 400, and the secondary concentration equipment 400 includes two concentration tanks 401 arranged in series;

[0063] The concentrating tank 401 includes a feed port 4011, a concentrating port 4012, and an overflow port 4013. The bottom of the concentrating tank 401 is provided with a conical structure, and notches 4014 are provided on both sides of the conical structure. Polyurethane sealing strips 4015 are installed around the notches 4014. The polyurethane sealing strips 4015 at the bottom also serve to scrape out mineral particles on the receiving belt 4019. A driver 4016 and a driven roller 4017 are installed on the side of the concentrating tank 401. An active transmission roller 4018 is installed at the output end of the driver 4016. A receiving belt 4019 is wound around the active drive roller 4018 and the driven roller 4017. An abutment member 4020 is installed in the area between the active drive roller 4018 and the driven roller 4017. A plurality of abutment rollers 4021 are provided on the abutment member 4020. The abutment rollers 4021 are used to squeeze the receiving belt 4019 against the outside of the notch 4014 and can move downward relative to it at a speed of 3-10 mm / min. The downward conveyance of the receiving belt 4019 does not affect the sedimentation of the particles and does not cause internal crossflow. A switch valve and a concentration sensor are installed at the concentration port 4012. The concentration sensor and the switch valve at the concentration port are connected to a PLC controller. The concentration signal collected by the concentration sensor is transmitted to the PLC controller, which determines whether the signal meets the set threshold. If so, it controls the switch valve to open the concentration port, completing the concentrated discharge.

[0064] The weak magnetically separated mineral first enters the buffer tank 300 before entering the concentration tank 401. A mounting plate 301 and a fixed plate 302 are installed in the buffer tank 300. A connecting ball 3011 is rotatably installed on the mounting plate 301. A connecting rod 3012 is installed on the top of the connecting ball 3011, and a stirring head 3013 is installed on the bottom. A slave gear 3014 is installed on the top of the connecting rod 3012. A plurality of stirring rods 3014 are hinged on the stirring head 3013. The fixed plate 302 is installed on the side top of the buffer tank 300. A drive motor 3021 is installed on the fixed plate 302. A main gear 3022 is installed on the output end of the drive motor 3021. The main gear 3022 is meshed with the slave gear 3014, and the slave gear 3014 rotates while making circumferential motion around the periphery of the main gear 3022. The main gear 3022 is driven to rotate by the driving motor 3021, and the slave gear 3014 rotates while making circumferential motion around the periphery of the main gear 3022. The stirring head 3013 at the bottom is used to stir the bottom. At the same time, the stirring rod 3014 on it will stir the four dead corners of the buffer tank 300 to prevent precipitation.

[0065] The yield, grade and recovery of each step in this embodiment are as follows:

[0066]

[0067] Example 2. In the above embodiment, the weak magnetic roughing adopts a magnetic separator, which includes a magnetic separation box 101, a feed trough 102, and a discharge trough 103. An arc-shaped magnetic separation trough 113 is set in the magnetic separation box 101, and a magnetic separation drum 104 is installed on the magnetic separation box 101. One end of the magnetic separation drum 104 is equipped with a transmission shaft 105 and a bearing seat 106 is installed on the outside. The other end is a shaft ring 107 and a roller support seat 108 is abutted on the outside of the shaft ring 107. The bearing seat 106 and the roller support seat 108 are both installed on the magnetic separation box 101. The magnetic separation drum 104 is horizontally eccentrically arranged. There is a permanent magnet group 109, and a maximum field strength position and a minimum field strength position are formed on the magnetic separation drum 104. One end of the permanent magnet group 109 is rotatably mounted on the inner side of one end of the transmission shaft 105 of the magnetic separation drum 104 through an eccentric disk 110, and the other end extends to the outside of the shaft ring 107 and is installed with a bearing seat 2 111. The bearing seat 2 111 is installed on the magnetic separation box 101. Two reduction motors 112 are installed on the magnetic separation box 101. The two reduction motors 112 are respectively located on both sides of the magnetic separation box 101, and the two reduction motors 112 are used to drive the magnetic separation drum 104 and the permanent magnet group 109 respectively.

[0068] The feed chute 102 is arranged above the side of the maximum field strength position, and the unloading chute 103 is arranged below the side of the minimum field strength position;

[0069] A magnetic separation channel is formed between the arc-shaped magnetic separation tank 113 and the magnetic separation drum 104;

[0070] The arc-shaped magnetic separation tank 113 is provided with two unloading openings 114 , which are symmetrically distributed on both sides of the arc-shaped magnetic separation tank 113 . The two unloading openings 114 are a tailing opening and a middling opening respectively.

[0071] The unloading port 114 is provided with an adjustable switch plate 115 , through which the opening size can be adapted and selected according to the specific implementation situation, thereby obtaining the required grade and recovery rate.

[0072] A magnetic isolation plate 1101 is installed on the eccentric disk 110. The bottom of the magnetic isolation plate 1101 covers the maximum field strength position and is higher than the top of the unloading chute 103. A top support rod 1102 is provided between the magnetic isolation plate 1101 and the permanent magnet group 109. One end of the top support rod 1102 is fixed on the magnetic isolation plate 1101 and the other end is rollingly installed on the permanent magnet group 109. The end of the magnetic isolation plate 1101 away from the eccentric disk 110 extends to the outside of the magnetic separation drum 104 through the connecting plate and is fixed to the magnetic separation box 101. The magnetic isolation plate 1101 can ensure that all magnetic materials on the magnetic separation drum 104 are cleaned up. Of course, a flushing water pipe is configured on the outside of the magnetic separation drum 104 where the magnetic isolation plate 1101 is located to flush and remove magnetic minerals on the surface.

[0073] This arrangement enables the magnetic separation drum 104 to be at its maximum field strength position when feeding ore and to complete roughing before the tailings outlet, and to complete concentrating between the tailings outlet and the unloading chute 103 .

[0074] For the ore to be processed with a particle size of -74μm accounting for 80%-95% of the total weight, a slurry with a concentration of 30% is prepared. The magnetite and weak magnetic ore are roughly selected by the weak magnetic separator 100, and the magnetite (selected at a field strength of 4000 Gauss) has a higher grade. Specifically, the slurry is fed from the feed trough 102 to the magnetic separation drum 104 above the maximum field strength position, so that the magnetic minerals are adsorbed on the surface in time. After passing the maximum field strength position, the magnetic field strength will initially decrease. At the same time, since the magnetic separation drum 104 and the permanent magnet group 109 are both rotating on their own, the adsorbed minerals are It will be transported to the unloading chute 103 and the agglomerates will be repeatedly opened during the transportation process to expose the non-magnetic minerals inside. After washing, it will be discharged through the tailings outlet. As the magnetic field strength gradually decreases, the weakly magnetic and very weakly magnetic minerals will fall off the magnetic separation drum and then be discharged from the mid-ore outlet. The magnetically separated concentrate is discharged from the unloading chute 103 to obtain magnetite. The tailings are non-magnetic ores, and the mid-ore are weakly magnetic ores and very weakly magnetic ores. The weakly magnetic ores and very weakly magnetic ores enter the high-intensity magnetic separator 200 to complete the selection and discard the tailings. The selected magnetic minerals are then concentrated and centrifuged to obtain wolframite concentrate.

[0075] Example 3: In the above embodiment, lifting plates 1011 are provided on both sides of the magnetic separation box 101, and the lifting plates 1011 are used to install the bearing seat 106, the bearing seat 2 111 and the reduction motor 112;

[0076] A guide rod 1012 is fixedly installed at the bottom of the lifting plate 1011, and the guide rod 1012 is vertically slidably fitted on the magnetic separation box 101;

[0077] An upper adjustment block 1013 is installed at the bottom of the lifting plate 1011, and a lower adjustment block 1014 is correspondingly provided below the upper adjustment block 1013. The lower adjustment block 1014 is horizontally mounted on the magnetic separation box 101. Horizontal guide rails 1015 are independently mounted on both sides of the lower adjustment block 1014. The horizontal guide rails 1015 are fixedly mounted on the magnetic separation box 101. A fine-thread top shaft 1016 is installed on one side of the lower adjustment block 1014. The fine-thread top shaft 1016 is threadedly connected to the magnetic separation box 101 and is used to horizontally push and pull the lower adjustment block 1014. During implementation, the lower adjustment block 1014 is horizontally moved by the fine-thread top shaft 1016, and the upper adjustment block 1013 is adjusted up and down to realize the overall magnetic separation structure to modify the magnetic field strength of the magnetic separation channel, thereby completing an efficient magnetic separation operation.

[0078] The bottom surface of the lower adjustment block 1014 is provided with a groove, and the area between the two horizontal guide rails 1015 is provided with a backstop plate 1017, and the backstop plate 1017 corresponds to the position of the groove. The lower adjustment block 1014 is provided with a vertical groove 10141, and a slider 10142 is slidably engaged in the vertical groove 10141, and a spring member is installed at the bottom of the slider 10142. A slide groove 1019 is provided on the slider 10142, and the bottom of the slide groove 1019 is set obliquely downward and gradually approaches the fine-tooth top shaft 1016. A connecting pin 10191 is slidably engaged in the slide groove 1019;

[0079] A through groove is provided on one side of the lower adjustment block 1014 relative to the fine-thread top shaft 1016 , and the fine-thread top shaft 1016 is connected and fixed to the connecting pin 10191 through the through groove. An elastic locking block 1018 is provided at the bottom of the slider 10142 .

[0080] The vertical groove 10141 is a stepped hole that is larger at the top and smaller at the bottom, and is divided into an upper mounting area and a lower guide area.

[0081] The elastic locking block 1018 includes a mounting groove arranged at the bottom of the slider 10142, in which a spring body 10181 and a T-shaped block 10182 are installed. The top of the T-shaped block 10182 slides and fits in the inner side of the mounting groove, and the top surface abuts against the bottom end of the spring body 10181. A limiting block 10183 is installed at the bottom of the mounting groove, and the limiting block 10183 is mounted on the outer side of the T-shaped block 10182. An anti-recoil plate 10184 is arranged at the bottom of the T-shaped block 10182, and a one-way ratchet is arranged on the opposite side of the anti-recoil plate 10184 and the anti-recoil plate 10184 and the stop plate 1017.

[0082] The slurry is fed from the feed trough 102 to the magnetic separation drum 104 and enters the arc-shaped magnetic separation tank 113. A horizontally offset permanent magnet group 109 is provided inside the magnetic separation drum 104. A maximum field strength position and a minimum field strength position are formed on the magnetic separation drum 104. The feed position is located above the side of the magnetic separation drum 104 at the maximum field strength position.

[0083] The magnetic material in the slurry is adsorbed on the magnetic separation drum 104, and the slurry is then fed to the magnetic separation drum 104 for a second time through the feeding arc plate 1131;

[0084] The slurry rotates around the respective axes of the magnetic separation drum 104 and the internal permanent magnet group 109. The permanent magnet group 109 has multiple alternating N and S poles. The magnetic material rolls on the surface of the magnetic separation drum 104 and is transported to the ore discharge chute 103.

[0085] The magnetic roughing tailings are flushed by water in the arc-shaped magnetic separation tank 113 and discharged through the tailings outlet. The magnetic roughing concentrate continues to pass through the bottom area of ​​the arc-shaped magnetic separation tank 113 and is flushed by water, and the magnetic roughing concentrate is discharged through the middling outlet.

[0086] The magnetic material still adsorbed on the magnetic separation drum 104 is discharged from the unloading chute 103, wherein the unloading chute 103 is located below the side of the magnetic separation drum 104 at the minimum field strength position;

[0087] When the fine-thread top shaft 1016 moves the lower adjustment block 1014 horizontally toward the upper adjustment block 1013, it moves upward along the slide groove 1019 via the connecting pin 10191, and moves the slider 10142 downward to compress the spring member, so that the elastic locking block 1018 fits on the anti-retraction plate 1017, thereby preventing the lower adjustment block 1014 from retreating.

[0088] When the fine-tooth top shaft 1016 moves the lower adjustment block 1014 horizontally away from the upper adjustment block 1013, it moves downward along the slide groove 1019 through the connecting pin 10191 and moves the slider 10142 upward, and the spring part is reset, so that the elastic locking block 1018 and the stop plate 1017 are released from the adaptation state.

[0089] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The replacement may be a replacement of a portion of a structure, device, or method step, or it may be a complete technical solution. Any equivalent replacement or modification based on the technical solution and inventive concept of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A method for recovering wolframite from tungsten-rich polymetallic ore, characterized in that: include: Step 1, Grinding Grind the raw ore to obtain a sludge ore with a particle size of -74μm accounting for 80%-95% by weight, and mix the sludge into a 30% slurry; Step 2: Magnetic separation of magnetite The ore pulp is subjected to weak magnetic roughing with a magnetic field strength of 4000 Gauss to obtain magnetic roughing concentrate, magnetic roughing tailings, and magnetic roughing ore; Step 3: Magnetic separation of wolframite The ore from the magnetic roughing is separated by a strong magnetic field of 1.0-1.3 Tesla to obtain weakly magnetic minerals and demagnetized tailings; The weak magnetic separation minerals are subjected to shaking table gravity separation to obtain wolframite concentrate I and gravity separation tailings. The gravity separation tailings are subjected to one coarse and two fine centrifugal gravity separation to obtain wolframite concentrate II and wolframite centrifuge tailings. Wolframite concentrate I and wolframite concentrate II are used as target wolframite concentrates. In step 3, the gravity separation tailings are first concentrated and then enter the centrifugal concentrator, and the concentration adopts a secondary concentration device (400), and the secondary concentration device (400) includes two concentration tanks (401) arranged in series; The concentration tank (401) includes a feed port (4011), a concentration port (4012) and an overflow port (4013). The bottom of the concentration tank is provided with a conical structure, and notches (4014) are provided on both sides of the conical structure. Polyurethane sealing strips (4015) are installed around the notches (4014). A driver (4016) and a driven roller (4017) are installed on the side of the concentration tank (401). The output end of the driver (4016) is provided with a There is an active transmission roller (4018), a receiving belt (4019) is wound around the active transmission roller (4018) and the driven roller (4017), an abutment member (4020) is installed in the area between the active transmission roller (4018) and the driven roller (4017), and a plurality of abutment rollers (4021) are provided on the abutment member (4020), and the abutment rollers (4021) are used to squeeze the receiving belt (4019) outside the notch (4014); The weak magnetic separation mineral first enters the buffer tank (300) before entering the concentration tank (401). The buffer tank (300) is installed with a mounting plate (301) and a fixed plate (302). A connecting ball (3011) is rotatably mounted on the mounting plate (301). A connecting rod 1 (3012) is mounted on the top of the connecting ball (3011), and a stirring head (3013) is mounted on the bottom. A slave gear (3014) is mounted on the top of the connecting rod 1 (3012). A plurality of stirring rods (3014) are hingedly connected to the mixing head (3013), a fixed plate (302) is mounted on the side top of the buffer tank (300), a driving motor (3021) is mounted on the fixed plate (302), a main gear (3022) is mounted on the output end of the driving motor (3021), the main gear (3022) is meshed with the slave gear (3014), and the slave gear (3014) rotates while performing circumferential motion around the periphery of the main gear (3022).

2. The method for recovering wolframite from tungsten-rich polymetallic ore according to claim 1, characterized in that: The weak magnetic roughing adopts a magnetic separator, which includes a magnetic separation box (101), a feed trough (102), and an unloading trough (103). An arc-shaped magnetic separation trough (113) is provided in the magnetic separation box (101). A magnetic separation roller (104) is installed on the magnetic separation box (101). A transmission shaft (105) is installed at one end of the magnetic separation roller (104), and a bearing seat (106) is installed on the outer side thereof. The other end is a shaft ring (107), and a roller support seat (108) is abutted on the outer side of the shaft ring (107). The bearing seat (106) and the roller support seat (108) are both installed on the magnetic separation box (101). A permanent magnet group (105) is horizontally eccentrically provided in the magnetic separation roller (104). 09), a maximum field strength position and a minimum field strength position are formed on the magnetic separation drum (104), one end of the permanent magnet group (109) is rotatably mounted on the inner side of one end of the transmission shaft (105) provided on the magnetic separation drum (104) through an eccentric disk (110), and the other end extends to the outer side of the shaft ring (107) and is mounted with a bearing seat 2 (111), and the bearing seat 2 (111) is mounted on the magnetic separation box (101), and two reduction motors (112) are mounted on the magnetic separation box (101), and the two reduction motors (112) are respectively located on both sides of the magnetic separation box (101), and the two reduction motors (112) are respectively used to drive the magnetic separation drum (104) and the permanent magnet group (109); The feed chute (102) is arranged above the side of the maximum field strength position, and the unloading chute (103) is arranged below the side of the minimum field strength position; A magnetic separation channel is formed between the arc-shaped magnetic separation tank (113) and the magnetic separation roller (104); The arc-shaped magnetic separation tank (113) is provided with two ore discharge openings (114), which are symmetrically distributed on both sides of the arc-shaped magnetic separation tank (113). The two ore discharge openings (114) are a tailings opening and a middling opening, respectively.

3. The method for recovering wolframite from argillaceous tungsten polymetallic ore according to claim 2, characterized in that: An adjustable switch plate (115) is installed at the ore unloading port (114).

4. The method for recovering wolframite from argillaceous tungsten polymetallic ore according to claim 2, characterized in that: A magnetic isolation plate (1101) is installed on the eccentric disk (110), the bottom of the magnetic isolation plate (1101) covers the maximum field strength position and is higher than the top of the ore unloading chute (103), a top support rod (1102) is provided between the magnetic isolation plate (1101) and the permanent magnet group (109), and one end of the magnetic isolation plate (1101) away from the eccentric disk (110) extends to the outside of the magnetic separation drum (104) through a connecting plate and is fixed to the magnetic separation box (101).

5. The method for recovering wolframite from tungsten-rich polymetallic ore according to claim 2, characterized in that: Lifting plates (1011) are provided on both sides of the magnetic separation box (101), and the lifting plates (1011) are used to install a first bearing seat (106), a second bearing seat (111) and a reduction motor (112); A guide rod (1012) is fixedly mounted on the bottom of the lifting plate (1011), and the guide rod (1012) is vertically slidably engaged with the magnetic separation box (101); An upper adjustment block (1013) is installed at the bottom of the lifting plate (1011), and a lower adjustment block (1014) is correspondingly provided below the upper adjustment block (1013). The lower adjustment block (1014) is horizontally installed on the magnetic separation box (101). Horizontal guide rails (1015) are independently installed on both sides of the lower adjustment block (1014). The horizontal guide rails (1015) are fixedly installed on the magnetic separation box (101). A fine-thread top shaft (1016) is installed on one side of the lower adjustment block (1014). The fine-thread top shaft (1016) is threadedly connected to the magnetic separation box (101). The fine-thread top shaft (1016) is used to push and pull the lower adjustment block (1014) horizontally.

6. The method for recovering wolframite from argillaceous tungsten polymetallic ore according to claim 5, characterized in that: The bottom surface of the lower adjustment block (1014) is provided with a groove, and a backstop plate (1017) is provided in the area between the two horizontal guide rails (1015), and the backstop plate (1017) corresponds to the position of the groove. The lower adjustment block (1014) is provided with a vertical groove (10141), and a slider (10142) is slidably engaged in the vertical groove (10141), and a spring member is installed at the bottom of the slider (10142). A slide groove (1019) is provided on the slider (10142), and the bottom of the slide groove (1019) is arranged obliquely downward and gradually approaches the fine tooth top shaft (1016), and a connecting pin (10191) is slidably engaged in the slide groove (1019); A through groove is provided on one side of the lower adjustment block (1014) relative to the fine thread top shaft (1016), and the fine thread top shaft (1016) is connected and fixed to the connecting pin (10191) through the through groove. An elastic locking block (1018) is provided at the bottom of the slider (10142).

7. The method for recovering wolframite from argillaceous tungsten polymetallic ore according to claim 6, characterized in that: The vertical groove (10141) is a stepped hole that is larger at the top and smaller at the bottom, and is divided into an upper mounting area and a lower guide area.

8. The method for recovering wolframite from argillaceous tungsten polymetallic ore according to claim 6, characterized in that: The elastic locking block (1018) comprises a mounting groove arranged at the bottom of the slider (10142), a spring body (10181) and a T-shaped block (10182) being installed in the mounting groove, the top of the T-shaped block (10182) being slidably fitted in the inner side of the mounting groove and the top surface abutting against the bottom end of the spring body (10181), a limiting block (10183) being installed in the bottom of the mounting groove, the limiting block (10183) being sleeved on the outer side of the T-shaped block (10182), an anti-recoil plate (10184) being provided at the bottom of the T-shaped block (10182), and one-way ratchets being provided on opposite sides of the anti-recoil plate (10184) and the anti-recoil plate (1017).

9. The method for recovering wolframite from argillaceous tungsten polymetallic ore according to claim 8, characterized in that: The ore pulp is fed from the feed trough (102) to the magnetic separation drum (104) and enters the arc-shaped magnetic separation trough (113). A horizontally biased permanent magnet group (109) is provided inside the magnetic separation drum (104). A maximum field strength position and a minimum field strength position are formed on the magnetic separation drum (104). The feed position is located above one side of the magnetic separation drum (104) at the maximum field strength position. The magnetic material in the ore pulp is adsorbed on the magnetic separation drum (104), and the ore pulp is then fed to the magnetic separation drum (104) for a second time via the feeding arc plate (1131); The slurry rotates around the respective axes of the magnetic separation drum (104) and the internal permanent magnet group (109). The permanent magnet group (109) comprises a plurality of alternatingly distributed N poles and S poles. The magnetic material rolls on the surface of the magnetic separation drum (104) and is transported to the ore discharge chute (103). The magnetic roughing tailings are flushed by water in the arc-shaped magnetic separation tank (113) and discharged through the tailings outlet. The magnetic roughing concentrate continues to pass through the bottom area of ​​the arc-shaped magnetic separation tank (113) and is flushed by water, and the magnetic roughing concentrate is discharged through the middling outlet. The magnetic material still adsorbed on the magnetic separation drum (104) is discharged through the unloading chute (103), wherein the unloading chute (103) is located below the side of the magnetic separation drum (104) at the minimum field strength position; When the fine-tooth top shaft (1016) moves the lower adjustment block (1014) horizontally toward the upper adjustment block (1013), the connecting pin (10191) moves upward along the slide groove (1019), and the slider (10142) moves downward to compress the spring member, so that the elastic locking block (1018) fits on the anti-retraction plate (1017), thereby preventing the lower adjustment block (1014) from retreating; When the fine-tooth top shaft (1016) moves the lower adjustment block (1014) horizontally away from the upper adjustment block (1013), it moves downward along the slide groove (1019) through the connecting pin (10191) and moves the slider (10142) upward, and the spring member resets, so that the elastic locking block (1018) and the stop plate (1017) are released from the adapted state.

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