A full-process beneficiation process for muddy tungsten polymetallic ore

Abstract

The present invention relates to polymetallic ore beneficiation technology, specifically a full-process beneficiation process for argillized tungsten polymetallic ores. The process utilizes magnetic separation to separate magnetite, high-intensity magnetic separation to separate wolframite (followed by shaker gravity separation and centrifugal gravity separation to obtain wolframite concentrate), oxalic acid pickling to activate the sulfide ore, reflotation to separate the sulfide ore, oxalic acid pickling and co-flotation to separate scheelite and fluorite, and finally centrifugal gravity separation to obtain scheelite and fluorite concentrates. Each ore is recovered with high grade and high recovery rate.

Description

Technical Field

[0001] The present invention relates to a polymetallic ore beneficiation technology, and in particular to a full-process beneficiation process for muddy tungsten polymetallic ore. Background Art

[0002] my country boasts abundant reserves of scheelite and a favorable mineralization environment, making it a superior mineral resource. However, due to the prevalence of poor ores and the scarcity of rich ores, as well as the complex composition of some deposits, scheelite is brittle and easily over-crushed, and is mostly embedded in fine particles. Gangue minerals are typically calcium-containing minerals with similar floatability to scheelite. These minerals coexist closely with tungsten minerals, making their separation difficult. With the large-scale mining of scheelite, the problems of "poor, fine, and mixed" scheelite resources have become increasingly prominent. Furthermore, scheelite deposits are associated with a variety of useful minerals, primarily tin, molybdenum, bismuth, copper, lead, and zinc; followed by sulfur, lithium, niobium, tantalum, and fluorite. Comprehensively recovering these beneficial components is not only a key approach to the rational development and utilization of mineral resources, but also a key way to improve the economic benefits of mining.

[0003] A search of CN113369005A reveals that flotation, magnetic separation, and other processes, if first subjected to flotation followed by magnetic separation, can result in residual pharmaceuticals in the selected minerals, which can corrode the magnetic separation equipment. Furthermore, oxidation of the raw ore can lead to unstable molybdenum and bismuth recoveries and poor bismuth recovery during the full flotation of sulfide ore. Furthermore, surface denaturation of scheelite and residual pharmaceuticals in the feed ore can result in insufficient purity in the selected fluorite and scheelite concentrates.

[0004] Therefore, it is of great significance to develop a mineral processing technology that can comprehensively recover tungsten resources and associated elements. Summary of the Invention

[0005] 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 present invention adopts the following technical solution:

[0006] A full-process beneficiation process for muddy tungsten polymetallic ore, comprising:

[0007] Step 1, Grinding

[0008] 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;

[0009] Step 2: Magnetic separation of magnetite

[0010] The ore pulp is subjected to weak magnetic roughing with a magnetic field strength of 4000 Gauss to obtain magnetic roughing concentrate and magnetic roughing tailings;

[0011] The magnetic roughing concentrate is subjected to weak magnetic concentration to obtain magnetic roughing concentrate and weak magnetic concentration tailings;

[0012] Step 3: Magnetic separation of wolframite

[0013] The magnetic roughing tailings and weak magnetic concentrator tailings are mixed and then subjected to strong magnetic separation at 1.0-1.3 Tesla to obtain weak magnetic separation minerals 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] Step 4, pickling

[0016] Add 1kg / t of oxalic acid to the demagnetized tailings and stir for 10 minutes to obtain acid-washed sulfide ore;

[0017] Step 5, sulfide ore flotation

[0018] To the pickled sulfide ore, add 800g / t water glass and stir for 2 minutes, 100g / t ethyl thiocyanate and stir for 2 minutes, 50g / t xanthate and stir for 2 minutes, and 100g / t BK-205 and stir for 2 minutes.

[0019] After all components are fully mixed, they are sent to the flotation machine for roughing for 4 minutes to obtain roughing concentrate and roughing tailings;

[0020] Add 200g / t of water glass to the rougher concentrate, stir for 1min, and concentrate for 3min to obtain the concentrated concentrate and concentrated tailings;

[0021] Add 10g / t of ethyl thiocyanate to the selected tailings, stir for 1 minute, and perform fine sweeping for 3 minutes to obtain fine sweep concentrate and fine sweep tailings;

[0022] Add 10g / t BK-205 to the rougher tailings and stir for 1min, then scavenge for 3min to obtain scavenged concentrate and scavenged tailings. The scavenged concentrate is added to the rougher concentrate.

[0023] The scavenging tailings and the fine scavenging tailings are mixed as the raw ore for the mixed beneficiation of scheelite and fluorite;

[0024] Step 6: Scheelite-fluorite simultaneous flotation

[0025] To the mixed ore of scavenging tailings and concentrated scavenging tailings, 4kg / t of oxalic acid was added in sequence and stirred for 30 minutes, 1kg / t of water glass was stirred for 2 minutes, and 1kg / t of scavenger LLR was stirred for 2 minutes. The mixture was then put into the flotation machine to obtain scheelite-fluorite flotation concentrate and co-floating tailings.

[0026] The scheelite-fluorite flotation concentrate is subjected to two blank concentrations to obtain the scheelite-fluorite concentrate;

[0027] Step 7: Scheelite and fluorite separation

[0028] The scheelite-fluorite concentrate is subjected to four centrifugal gravity separations to separate the scheelite concentrate and fluorite concentrate.

[0029] In the present application, in step 2, the slurry is fed from the feed trough to the magnetic separation drum and enters the 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.

[0030] 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;

[0031] The slurry rotates around the respective axes in 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 concentrate discharge port.

[0032] The magnetic roughing tailings are flushed by water in the magnetic separation tank and discharged through the tailings port. The magnetic roughing concentrate continues to pass through the bottom area of ​​the magnetic separation tank and is flushed by water, and the weak magnetic concentrate tailings are discharged through the middling port.

[0033] The magnetic material still adsorbed on the magnetic separation drum is discharged from the concentrate discharge port, where the concentrate discharge port is located below the side of the magnetic separation drum at the minimum field strength position.

[0034] In the present application, a magnetic isolation plate is independently provided between the magnetic separation drum and the permanent magnet group, and the magnetic isolation plate is located above the interior of the magnetic separation drum at the minimum field strength position;

[0035] An unloading water pipe is provided on the outside of the magnetic separation drum. The unloading water pipe is located above one side of the magnetic separation drum at the minimum field strength position and the water flow direction is set obliquely downward.

[0036] In the solution of the present application, opening and closing arc plates are provided at both the intermediate ore opening and the tailings opening, and the opening and closing arc plates are used to adjust the size of the intermediate ore opening and the tailings opening.

[0037] In the present application, in step 5, after the components are fully mixed and fed into the flotation machine, the reagent captures the sulfide ore and the mixed bubbles float together. After floating, the sulfide ore is sent from the slurry tank to the recovery tank under the action of the rotating scraper.

[0038] The scraper plate includes a connecting plate and a movable plate. The connecting plate is slidably installed in the movable plate. The movable plate is a hollow plate. The bottom of the movable plate floats on the surface of the slurry. The connecting plate is fixed on the rotating shaft. The rotating shaft is equipped with an independent reduction motor. An arc groove is provided in the slurry tank. An adjusting block is installed in the arc groove. The adjusting block includes a sliding body slidingly fitted in the arc groove and a rotating body rotatably installed on the sliding body. A torsion spring is installed between the rotating body and the sliding body. A connecting rope is installed on the sliding body. One end of the connecting rope is passed around the guide wheel and connected to the rotating disk. The rotating disk and the guide wheel are installed inside the recovery tank. A flushing pipe is installed on the rotating disk. A plurality of linearly distributed flushing water outlets are provided on the flushing pipe. The flushing water outlets are used to flush the front and back of the movable plate.

[0039] In the present application, a limit plate is provided on the top of the movable plate, which is used to limit the maximum outward extension length of the connecting plate relative to the movable plate. A baffle is provided on the side of the limit plate facing away from the rotating axis, and the baffle is gradually arranged away from the rotating axis along the side away from the movable plate.

[0040] In the present application, an elastic limit pin 1 is installed in the arc groove, and the elastic limit pin 1 is used to limit the sliding body when the flushing pipe flushes the front of the movable plate.

[0041] In the solution of the present application, a second elastic limit pin is provided on the top of the recovery tank, and the second elastic limit pin is used to limit the rotating disk when the flushing pipe flushes the back of the movable plate.

[0042] In the present application, the flotation froth is transported from the pulp tank to the recovery tank by the flotation scraper:

[0043] Step 51: The reduction motor drives the rotating shaft to rotate. Under the action of gravity, the movable plate first moves downward along the connecting plate until the movable plate floats on the liquid surface. As the rotating shaft rotates, the bottom of the movable plate always moves along the liquid surface, transporting the flotation foam to the recovery tank.

[0044] In step 52, after the movable plate transports the bubbles into the recovery tank, the flushing pipe flushes the front surface of the movable plate. As the movable plate rotates, it contacts the flushing pipe and drives the flushing pipe to rotate relative to the slurry tank to the end position. The rotating disk is limited by the elastic limit pin 2. At this time, the flushing pipe flushes the non-bubble-pushing surface of the movable plate, and the flushing water and foam enter the recovery tank.

[0045] Step 53, as the movable plate continues to move, the movable plate moves downward relative to the connecting plate, the leakage length of the connecting plate decreases, the movable plate will act on the rotating body, and the rotating body and the movable plate move to the initial position together. When moving to the initial position, the flushing pipe returns to the initial position. At this time, the sliding body is restricted by the elastic limit pin; after moving to the initial position, as the movable plate continues to rotate, the rotating body deflects relative to the sliding body and compresses the torsion spring. When the movable plate passes the rotating body, the rotating body is reset under the action of the torsion spring.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The present invention selects magnetite by magnetic separation, selects wolframite by strong magnetic separation (followed by shaking table gravity separation + centrifugal gravity separation to obtain wolframite concentrate), activates sulfide ore by oxalic acid pickling, selects sulfide ore by refloatation, selects scheelite and fluorite by oxalic acid pickling + co-floatation, and finally centrifuges to reselect scheelite concentrate and fluorite concentrate. The recovery grade of each ore is high and the recovery rate is also high. The whole process recovers components such as Figure 2 shown. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a process flow chart of the present invention.

[0049] Figure 2 This is a full-process test data diagram of the present invention.

[0050] Figure 3 It is a schematic diagram of the structure inside the magnetic separation tank of the present invention.

[0051] Figure 4 for Figure 3 Structural relationship diagram of the medium magnetic separation drum and permanent magnet group.

[0052] Figure 5 for Figure 3 Side view of the middle magnetic separation drum away from the drive end.

[0053] Figure 6 Schematic diagram of the internal structure of the flotation machine.

[0054] Figure 7 for Figure 6 Partial schematic diagram of the middle scraper plate.

[0055] Figure 8 for Figure 7 Position relationship diagram of the middle adjustment block and arc groove.

[0056] Figure 9 for Figure 7 Position relationship diagram of the middle rotating disk and the elastic limit pin;

[0057] Figure 10 This is a diagram showing the position relationship between the movable plate and the connecting plate. DETAILED DESCRIPTION

[0058] 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.

[0059] 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.

[0060] Example 1

[0061] like Figure 1 As shown, a full-process beneficiation process for muddy tungsten polymetallic ore includes:

[0062] Step 1, Grinding

[0063] The raw ore is ground to obtain a mud ore with a particle size of -74μm and a weight percentage of 80%-95%, such as Figure 2 As shown, the mud ore is prepared into 30% slurry;

[0064] Step 2: Magnetic separation of magnetite

[0065] The ore pulp is subjected to weak magnetic roughing with a magnetic field strength of 4000 Gauss to obtain magnetic roughing concentrate and magnetic roughing tailings;

[0066] The magnetic roughing concentrate is subjected to weak magnetic concentration to obtain magnetic roughing concentrate and weak magnetic concentration tailings;

[0067] Step 3: Magnetic separation of wolframite

[0068] The magnetic roughing tailings and weak magnetic concentrator tailings are mixed and then subjected to strong magnetic separation at 1.0-1.3 Tesla to obtain weak magnetic separation minerals and demagnetized tailings;

[0069] 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.

[0070] Step 4, pickling

[0071] Add 1kg / t of oxalic acid to the demagnetized tailings and stir for 10 minutes to obtain acid-washed sulfide ore;

[0072] Step 5, sulfide ore flotation

[0073] To the pickled sulfide ore, add 800g / t water glass and stir for 2 minutes, 100g / t ethyl thiocyanate and stir for 2 minutes, 50g / t xanthate and stir for 2 minutes, and 100g / t BK-205 and stir for 2 minutes.

[0074] After all components are fully mixed, they are sent to the flotation machine for roughing for 4 minutes to obtain roughing concentrate and roughing tailings;

[0075] Add 200g / t of water glass to the rougher concentrate, stir for 1min, and concentrate for 3min to obtain the concentrated concentrate and concentrated tailings;

[0076] Add 10g / t of ethyl thiocyanate to the selected tailings, stir for 1 minute, and perform fine sweeping for 3 minutes to obtain fine sweep concentrate and fine sweep tailings;

[0077] Add 10g / t BK-205 to the rougher tailings and stir for 1min, then scavenge for 3min to obtain scavenged concentrate and scavenged tailings. The scavenged concentrate is added to the rougher concentrate.

[0078] The scavenging tailings and the fine scavenging tailings are mixed as the raw ore for the mixed beneficiation of scheelite and fluorite;

[0079] Step 6: Scheelite-fluorite simultaneous flotation

[0080] To the mixed ore of scavenging tailings and concentrated scavenging tailings, 4kg / t of oxalic acid was added in sequence and stirred for 30 minutes, 1kg / t of water glass was stirred for 2 minutes, and 1kg / t of scavenger LLR was stirred for 2 minutes. The mixture was then put into the flotation machine to obtain scheelite-fluorite flotation concentrate and co-floating tailings.

[0081] The scheelite-fluorite flotation concentrate is subjected to two blank concentrations to obtain the scheelite-fluorite concentrate;

[0082] Step 7: Scheelite and fluorite separation

[0083] The scheelite-fluorite concentrate is subjected to four centrifugal gravity separations to separate the scheelite concentrate and fluorite concentrate.

[0084] The grade index and cumulative recovery rate index of each step are as follows: Figure 2 shown.

[0085] In step 2, if Figures 3 to 5 As shown, the slurry is fed from the feed trough 301 to the magnetic separation drum 302 and enters the magnetic separation tank 304. A horizontally offset permanent magnet group 303 is provided inside the magnetic separation drum 302. A maximum field strength position and a minimum field strength position are formed on the magnetic separation drum 302. The feed position is located above the side of the magnetic separation drum 302 at the maximum field strength position.

[0086] The magnetic material in the slurry is adsorbed on the magnetic separation drum 302, and the slurry is then fed to the magnetic separation drum 302 for a second time through the feeding arc plate 305;

[0087] The slurry rotates around the respective axes in the magnetic separation drum 302 and the internal permanent magnet group 303. The specific arrangement structure is not limited. The permanent magnet group 303 has multiple alternating N poles and S poles. The magnetic material rolls on the surface of the magnetic separation drum 302 and is transported to the concentrate discharge port.

[0088] The magnetic rougher tailings are flushed by water in the magnetic separation tank 304 and discharged through the tailings outlet. The magnetic rougher concentrate continues to pass through the bottom area of ​​the magnetic separation tank 304 and is flushed by water, and the weak magnetic concentrate tailings are discharged through the middling outlet.

[0089] The magnetic materials still adsorbed on the magnetic separation drum 302 are discharged from the concentrate discharge port, wherein the concentrate discharge port is located below the side of the magnetic separation drum 302 at the minimum field strength position.

[0090] A magnetic isolation plate 306 is independently arranged between the magnetic separation drum 302 and the permanent magnet group 303. The bottom of the magnetic isolation plate 306 covers the maximum field strength position and is higher than the top of the concentrate discharge port. A top support rod 307 is arranged between the magnetic isolation plate 306 and the permanent magnet group 303. The top support rod 307 can be a threaded telescopic rod. The end of the top support rod 307 away from the magnetic isolation plate 306 is rolled and installed on the outside of the permanent magnet group 109. An eccentric disk 310 is installed at one end of the magnetic isolation plate 306. One end of the permanent magnet group 303 is installed in the magnetic separation drum 302 through the eccentric disk 310. The end of the magnetic isolation plate 306 away from the eccentric disk 310 extends to the outside of the magnetic separation drum 302 through the connecting plate and is independently fixed. One end of the permanent magnet group 303 is equipped with a driver, and one end of the magnetic separation drum 302 is also equipped with a driver. The two drivers are respectively located at both ends of the magnetic separation drum 302. The magnetic isolation plate 303 blocks the position near the minimum field strength to prevent the magnetic minerals on the surface of the magnetic separation drum 103 from continuing to adsorb on the surface, and complete the unloading of the ore as much as possible.

[0091] An ore unloading water pipe 308 is provided on the outside of the magnetic separation drum 302. The ore unloading water pipe 308 is located above one side of the magnetic separation drum 302 at the minimum field strength position and the water flow direction is set obliquely downward to facilitate ore unloading.

[0092] The opening and closing ports of appropriate size are selected according to the required requirements to obtain the required accuracy and recovery rate. The middle ore port and the tailing port are both provided with opening and closing arc plates 309, which are used to adjust the size of the middle ore port and the tailing port.

[0093] Example 2

[0094] In the above process, Figures 6 to 9 As shown, in step 5, after the components are fully mixed and fed into the flotation machine, the reagent captures the sulfide ore and the mixed bubbles float together. After floating, the sulfide ore is sent to the recovery tank 503 through the slurry tank 502 under the action of the rotating bubble scraper 501;

[0095] The scraping plate 501 includes a connecting plate 5011 and a movable plate 5012. The connecting plate 5011 is partially slidably mounted in the movable plate 5012. The movable plate 5012 is a hollow plate that can float on the liquid surface when scraping bubbles. The bottom of the movable plate 5012 floats on the surface of the slurry. The connecting plate 5011 is fixed to the rotating shaft 504. The rotating shaft 504 is equipped with an independent reduction motor. An arc groove 505 is provided in the slurry tank 502. An adjustment block 5051 is installed in the arc groove 505. The adjustment block 5051 includes a sliding block that slides in the arc groove 505. The movable plate 5012 is provided with a body 50511 and a rotating body 50512 rotatably mounted on the sliding body 50511, a torsion spring is installed between the rotating body 50512 and the sliding body 50511, a connecting rope 506 is installed on the sliding body 50511, one end of the connecting rope 506 is passed around the guide wheel 508 and is connected to the rotating disk 507, the rotating disk 507 and the guide wheel 508 are installed inside the recovery tank 503, a flushing pipe 509 is installed on the rotating disk 507, and a plurality of linearly distributed flushing water outlets are provided on the flushing pipe 509, and the flushing water outlets are used to flush the front and back sides of the movable plate 5012.

[0096] A limit plate 5010 is provided on the top of the movable plate 5012 to limit the maximum extension length of the connecting plate 5011 relative to the movable plate 5012. A stop bar is provided on the side of the limit plate 5010 facing away from the rotating shaft 504. The stop bar is arranged gradually away from the rotating shaft 504 along the side away from the movable plate 5012 to drain the slurry washed on the surface of the movable plate 5012 into the recovery tank 503.

[0097] An elastic limiting pin 5052 is installed in the arc groove 505 , and the elastic limiting pin 5052 is used to limit the sliding body 50511 when the flushing pipe 509 flushes the front of the movable plate 5012 .

[0098] A second elastic limiting pin 5053 is provided on the top of the recovery tank 503 , and the second elastic limiting pin 5053 is used to limit the rotating disk 507 when the flushing pipe 509 flushes the back of the movable plate 5012 .

[0099] The flotation froth is transported from the pulp tank 502 to the recovery tank 503 by the flotation scraper 501:

[0100] Step 51: The reduction motor drives the rotating shaft 504 to rotate. Under the action of gravity, the movable plate 5012 first moves downward along the connecting plate 5011 until the movable plate 5012 floats on the liquid surface. As the rotating shaft 504 rotates, the bottom of the movable plate 5012 always moves along the liquid surface, transporting the flotation foam to the recovery tank 503.

[0101] In step 52, after the movable plate 5012 transports the bubbles into the recovery tank 503, the flushing pipe 509 flushes the front surface of the movable plate 5012. As the movable plate 5012 rotates, it contacts the flushing pipe 509 and drives the flushing pipe 509 to rotate relative to the slurry tank 502 to the final position. The rotating disk 507 is limited by the elastic limit pin 2 5012. At this time, the flushing pipe 509 flushes the non-bubble-pushing surface of the movable plate 5012, and the flushing water and foam enter the recovery tank 503.

[0102] Step 53. As the movable plate 5012 continues to move, the movable plate 5012 moves downward relative to the connecting plate 5011, and the exposed length of the connecting plate 5011 decreases. The movable plate 5012 will act on the rotating body 50512, and the rotating body 50512 moves to the initial position together with the movable plate 5012. When moving to the initial position, the flushing pipe 509 returns to the initial position. At this time, the sliding body 50511 is restricted by the elastic limit pin 5011; after moving to the initial position, as the movable plate 5012 continues to rotate, the rotating body 50512 deflects relative to the sliding body 50511 and compresses the torsion spring. When the movable plate 5012 passes the rotating body 50512, the rotating body 50512 is reset under the action of the torsion spring.

[0103] 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 full-process beneficiation process for muddy tungsten polymetallic ore, characterized in that: include: Step 1, Grinding 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; 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 and magnetic roughing tailings; The magnetic roughing concentrate is subjected to weak magnetic concentration to obtain magnetic roughing concentrate and weak magnetic concentration tailings; Step 3: Magnetic separation of wolframite The magnetic roughing tailings and weak magnetic concentrator tailings are mixed and then subjected to strong magnetic separation at 1.0-1.3 Tesla to obtain weak magnetic separation 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. Step 4, pickling Add 1kg / t of oxalic acid to the demagnetized tailings and stir for 10 minutes to obtain acid-washed sulfide ore; Step 5, sulfide ore flotation To the pickled sulfide ore, add 800g / t water glass and stir for 2 minutes, 100g / t ethyl thiocyanate and stir for 2 minutes, 50g / t xanthate and stir for 2 minutes, and 100g / t BK-205 and stir for 2 minutes. After all components are fully mixed, they are sent to the flotation machine for roughing for 4 minutes to obtain roughing concentrate and roughing tailings; Add 200g / t of water glass to the rougher concentrate, stir for 1min, and concentrate for 3min to obtain the concentrated concentrate and concentrated tailings; Add 10g / t of ethyl thiocyanate to the selected tailings, stir for 1 minute, and perform fine sweeping for 3 minutes to obtain fine sweep concentrate and fine sweep tailings; Add 10g / t BK-205 to the rougher tailings and stir for 1min, then scavenge for 3min to obtain scavenged concentrate and scavenged tailings. The scavenged concentrate is added to the rougher concentrate. The scavenging tailings and the fine scavenging tailings are mixed as the raw ore for the mixed beneficiation of scheelite and fluorite; Step 6: Scheelite-fluorite simultaneous flotation To the mixed ore of scavenging tailings and concentrated scavenging tailings, 4kg / t of oxalic acid was added in sequence and stirred for 30 minutes, 1kg / t of water glass was stirred for 2 minutes, and 1kg / t of scavenger LLR was stirred for 2 minutes. The mixture was then put into the flotation machine to obtain scheelite-fluorite flotation concentrate and co-floating tailings. The scheelite-fluorite flotation concentrate is subjected to two blank concentrations to obtain the scheelite-fluorite concentrate; Step 7: Scheelite and fluorite separation The scheelite-fluorite concentrate is subjected to four centrifugal gravity separations to obtain scheelite concentrate and fluorite concentrate.

2. The full-process beneficiation process of muddy tungsten polymetallic ore according to claim 1 is characterized in that: In step 2, the slurry is fed from the feed trough to the magnetic separation drum and enters the 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 the side of the magnetic separation drum at the maximum field strength position. 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; The slurry rotates around the respective axes in 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 concentrate discharge port. The magnetic roughing tailings are flushed by water in the magnetic separation tank and discharged through the tailings outlet. The magnetic roughing concentrate continues to pass through the bottom area of ​​the magnetic separation tank and is flushed by water, and the weak magnetic concentrate tailings are discharged through the middling outlet. The magnetic material still adsorbed on the magnetic separation drum is discharged from the concentrate discharge port, where the concentrate discharge port is located below the side of the magnetic separation drum at the minimum field strength position.

3. The full-process beneficiation process for muddy tungsten polymetallic ore according to claim 2 is characterized in that: A magnetic isolation plate is independently provided between the magnetic separation drum and the permanent magnet group, and the magnetic isolation plate is located above the interior of the magnetic separation drum at the minimum field strength position; An unloading water pipe is provided on the outside of the magnetic separation drum. The unloading water pipe is located above one side of the magnetic separation drum at the minimum field strength position and the water flow direction is set obliquely downward.

4. The full-process beneficiation process for muddy tungsten polymetallic ore according to claim 3 is characterized in that: The intermediate ore opening and the tailing opening are both provided with opening and closing arc plates, which are used to adjust the sizes of the intermediate ore opening and the tailing opening.

5. The full-process beneficiation process for muddy tungsten polymetallic ore according to claim 4 is characterized in that: In step 5, after all the components are fully mixed and fed into the flotation machine, the reagent captures the sulfide ore and the mixed bubbles float up together. After floating, they are sent from the slurry tank to the recovery tank under the action of the rotating scraper. The scraper plate includes a connecting plate and a movable plate. The connecting plate is slidably installed in the movable plate. The movable plate is a hollow plate. The bottom of the movable plate floats on the surface of the slurry. The connecting plate is fixed on the rotating shaft. The rotating shaft is equipped with an independent reduction motor. An arc groove is provided in the slurry tank. An adjusting block is installed in the arc groove. The adjusting block includes a sliding body slidingly fitted in the arc groove and a rotating body rotatably installed on the sliding body. A torsion spring is installed between the rotating body and the sliding body. A connecting rope is installed on the sliding body. One end of the connecting rope is passed around the guide wheel and connected to the rotating disk. The rotating disk and the guide wheel are installed inside the recovery tank. A flushing pipe is installed on the rotating disk. A plurality of linearly distributed flushing water outlets are provided on the flushing pipe. The flushing water outlets are used to flush the front and back of the movable plate.

6. The full-process beneficiation process for muddy tungsten polymetallic ore according to claim 5 is characterized in that: A limit plate is provided on the top of the movable plate, which is used to limit the maximum extension length of the connecting plate relative to the movable plate. A baffle is provided on the side of the limit plate facing away from the rotating shaft, and the baffle is gradually arranged away from the rotating shaft along the side away from the movable plate.

7. The full-process beneficiation process for muddy tungsten polymetallic ore according to claim 5 is characterized in that: An elastic limiting pin 1 is installed in the arc groove, and the elastic limiting pin 1 is used to limit the sliding body when the flushing pipe flushes the front side of the movable plate.

8. The full-process beneficiation process for muddy tungsten polymetallic ore according to claim 5 is characterized in that: A second elastic limiting pin is provided on the top of the recovery tank, and the second elastic limiting pin is used to limit the rotating disk when the flushing pipe flushes the back of the movable plate.

9. The full-process beneficiation process for muddy tungsten polymetallic ore according to claim 5 is characterized in that: The flotation froth is transported from the pulp tank to the recovery tank by the flotation scraper: Step 51: The reduction motor drives the rotating shaft to rotate. Under the action of gravity, the movable plate first moves downward along the connecting plate until the movable plate floats on the liquid surface. As the rotating shaft rotates, the bottom of the movable plate always moves along the liquid surface, transporting the flotation foam to the recovery tank. In step 52, after the movable plate transports the bubbles into the recovery tank, the flushing pipe flushes the front surface of the movable plate. As the movable plate rotates, it contacts the flushing pipe and drives the flushing pipe to rotate relative to the slurry tank to the end position. The rotating disk is limited by the elastic limit pin 2. At this time, the flushing pipe flushes the non-bubble-pushing surface of the movable plate, and the flushing water and foam enter the recovery tank. Step 53, as the movable plate continues to move, the movable plate moves downward relative to the connecting plate, the leakage length of the connecting plate decreases, the movable plate will act on the rotating body, and the rotating body and the movable plate move to the initial position together. When moving to the initial position, the flushing pipe returns to the initial position. At this time, the sliding body is restricted by the elastic limit pin; after moving to the initial position, as the movable plate continues to rotate, the rotating body deflects relative to the sliding body and compresses the torsion spring. When the movable plate passes the rotating body, the rotating body is reset under the action of the torsion spring.

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