A beneficiation process for recovering scheelite and fluorite from muddy tungsten polymetallic ore

Abstract

The present invention discloses a beneficiation process for recovering scheelite and fluorite from muddy tungsten polymetallic ore. The process sequentially removes magnetite, removes weak magnetic ore, acidifies and removes sulfide ore, selects a mixed scheelite-fluorite mixture, and then centrifuges to obtain scheelite concentrate and fluorite concentrate. The process employs magnetic separation followed by flotation to reduce equipment corrosion while also improving the grade and recovery rate of the scheelite concentrate and fluorite. Under the conditions of a strong magnetic tailings containing 0.34% tungsten and 25.65% fluorite, experiments have shown that a scheelite concentrate with a tungsten content of 17.96% and a cumulative recovery rate of 20.42% can be obtained; a fluorite concentrate with a fluorite content of 77.86% and a cumulative recovery rate of 47.72% can be obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of tungsten ore beneficiation, and specifically relates to a beneficiation process for recovering scheelite and fluorite from muddy tungsten polymetallic ore. Background Art

[0002] my country is a major producer of nonferrous metals, with huge reserves of tungsten-associated fluorite polymetallic mineral resources. The crushing process currently used for this type of ore is generally a three-stage and one-closed-circuit crushing method, with the final crushing particle size of -15mm accounting for about 90%. The grinding and classification process used is a closed-circuit classification of ball mills and cyclones or spiral classifiers. The flotation principle process is sulfide ore flotation → scheelite flotation or sulfide ore flotation → mixed flotation of black and white tungsten → fluorite flotation process.

[0003] The existing scheelite-fluorite beneficiation technology has the following shortcomings:

[0004] 1. In the existing mineral processing technology, the recovery rates of molybdenum and bismuth are unstable and the bismuth recovery rate is poor during the full flotation process of sulfide ore. The inventors have found that this may be due to partial oxidation and contamination of the ore surface. In order to eliminate the oxidation and contamination of the surface, sulfide ore remains in the tailings, which in turn affects the subsequent beneficiation of scheelite and fluorite.

[0005] 2. Existing mineral processing technologies mostly operate under neutral or alkaline conditions when recovering scheelite. For example, in CN112354684A, whether sodium carbonate or mixed alkali is used as a pH adjuster, effective recovery of tungsten concentrate is not achieved under a single flotation process. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: how to solve the problem that the existing mineral processing technology cannot effectively remove sulfide ores and effectively recover scheelite.

[0007] 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:

[0008] The beneficiation process for recovering scheelite and fluorite from argillized tungsten polymetallic ore is as follows:

[0009] Step 1: Removal of magnetite

[0010] The polymetallic mineral is ground and then the ground material is screened to obtain the mineral to be selected, in which the particle size of the mineral to be selected is -74μm, accounting for 80%-95% by weight. The mineral is then mixed into a slurry with a concentration of 30%. The mineral is passed through a permanent magnetic separator with a magnetic field strength of 4500 Gauss to remove magnetite from the slurry.

[0011] Step 2: Removal of weak magnetic separation minerals

[0012] The slurry from which magnetite has been removed is fed into a strong magnetic separator with a magnetic field strength of 1.0 Tesla to 1.3 Tesla to remove weak magnetic minerals;

[0013] Step 3: Acidification to remove sulfide ore

[0014] The slurry after weak magnetic separation is sent to the mixing tank and oxalic acid, water glass, ethylthiocyanate, butyl xanthate, and BK-205 are added. After the components are fully mixed, they are sent to the flotation machine together to remove the sulfide ore by flotation.

[0015] Step 4: Scheelite-fluorite mixed selection

[0016] The pulp from which the sulfide ore has been removed is fed into a mixing tank, and oxalic acid, water glass, and collector LLR are added and stirred for at least 30 minutes. The stirred pulp is then fed into a flotation machine, and after three flotation operations (one coarse and two fine), a scheelite-fluorite mixed concentrate is obtained.

[0017] Step 5, centrifugation

[0018] The scheelite-fluorite mixed concentrate is fed into a centrifugal concentrator. After the heavy minerals obtained by the centrifugal concentrator are concentrated to a concentration of 30%, they are fed into the centrifugal concentrator again. This process is repeated four times. The heavy minerals finally obtained are scheelite concentrate, and the centrifugal roughing tailings are fluorite concentrate. The frequencies of the four centrifugal concentrators are set to 50Hz, 45Hz, 40Hz, and 30Hz respectively.

[0019] Preferably, in step 3, 1 kg / t of oxalic acid is first added and stirred for 10 minutes, and then 800 g / t of water glass is added and stirred for 2 minutes, 100 g / t of ethyl thiocyanate is added and stirred for 2 minutes, 50 g / t of xanthate is added and stirred for 2 minutes, and 100 g / t of BK-205 is added and stirred for 2 minutes.

[0020] Preferably, the specific process of flotation removal of sulfide ore is:

[0021] Step 31, rough selection

[0022] 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;

[0023] Step 32, Select

[0024] 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;

[0025] Step 33, Precision Scan

[0026] 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;

[0027] Step 34, Scan

[0028] Add 10g / t of BK-205 to the rougher tailings and stir for 1min, and scavenging for 3min to obtain scavenging concentrate and scavenging tailings. The scavenging concentrate is added to the rougher concentrate, and the scavenging tailings are desulfurized ore as the raw ore for scheelite-fluorite mixed selection.

[0029] Preferably, in step 4, 4 kg / t of oxalic acid is first added and stirred for 30 min, and then 1 kg / t of water glass is added and stirred for 2 min, and 1 kg of scavenger LLR is added and stirred for 2 min.

[0030] Preferably, the flotation machine comprises a pulp tank, a driver 1 and a driver 2 are installed on the pulp tank, and a flow stabilizing plate is provided at the bottom of the pulp tank;

[0031] The flotation mechanism includes a flotation tube, a drive shaft is installed inside the flotation tube, the top of the drive shaft is connected to the driver, a mixing sleeve is provided at the bottom of the flotation tube, and a fluid distributor is provided at the bottom of the drive shaft, and the fluid distributor is located at the inner bottom of the mixing sleeve;

[0032] An air inlet pipe is arranged obliquely downward, with its bottom connected to the flotation pipe and its top higher than the liquid level of the slurry tank;

[0033] The ore pipe and the reagent pipe are both connected to the flotation pipe, and the inlet height of the ore pipe to the flotation pipe is greater than the inlet height of the reagent pipe to the flotation pipe. The mixture of ore, reagent and air is dispersed outward by the diverter flow.

[0034] A recovery tank is provided on one side of the slurry tank;

[0035] The bubble scraping mechanism includes a bubble scraping plate, which is connected to the driver via a rotating shaft and is used to clean the bubbles into a recovery tank.

[0036] Preferably, the bubble scraping plate includes a connecting plate and a movable plate, one end of the connecting plate is fixed on the rotating shaft, and the other end of the connecting plate is socket-sliding fitted on the movable plate, the movable plate is a hollow plate, a movable bin is provided on one side of the movable plate and a limiting plate is installed on the end of the movable bin, the connecting plate is slidingly fitted in the movable bin and the maximum extension stroke is limited by the limiting plate.

[0037] Preferably, the bubble scraping mechanism also includes a flushing pipe, a guide wheel and a pulling plate. The flushing pipe is used to flush the foam on the surface of the movable plate. Rotating disks are installed at both ends of the flushing pipe. The rotating disks are rotatably installed on the inner side of the slurry tank. The guide wheel is installed on the side of the slurry tank. An arc groove is provided on the inner side of the slurry tank. The center of the arc groove is located on the axis of the rotating shaft. The inner side of the arc groove slides with the pulling plate. The pulling plate is connected to the rotating disk via a connecting rope and the connecting rope is wrapped around the guide wheel. The pulling plate includes a sliding body and a rotating body. The sliding body slides in the arc groove. The rotating body is rotatably installed on the sliding body and a torsion spring is installed on the rotating node. An elastic limit pin 1 is installed inside the arc groove to limit the sliding body. An elastic limit pin 2 is installed on the inner side of the slurry tank to limit the deflection angle of the rotating disk.

[0038] Preferably, the slurry flotation operation:

[0039] Step 1: Slurry and reagents enter

[0040] After the ore pulp and reagent are preliminarily mixed, they enter the flotation tube mixing sleeve through the ore pipe for mixing;

[0041] Step 2: Mix the components

[0042] The driver drives the drive shaft to rotate and disperse the slurry and reagent mixture from the inside through the distribution fluid to the outside into the slurry tank. At the same time, air enters the mixing sleeve through the air inlet pipe to achieve full mixing of the slurry, reagent and air.

[0043] Step 3, scrape the foam

[0044] The reagent captures the corresponding minerals in the slurry and the bubbles float up. The second driver drives the rotating shaft to rotate. Under the action of gravity, the movable plate first moves down 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 bubbles to the recovery tank.

[0045] Step 4. Clean up

[0046] After the movable plate transports the bubbles into the recovery tank, the flushing pipe flushes the bubble-pushing 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;

[0047] Step 5, Reset

[0048] As the movable plate continues to move, the movable plate moves downward relative to the connecting plate, the external leakage length of the connecting plate decreases, and the movable plate acts 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.

[0049] Repeat steps 1 to 5 until the flotation operation is completed.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1. The prior art presents unstable molybdenum and bismuth recoveries, and relatively poor bismuth recovery, during the full flotation of sulfide ores. The inventors, through years of mineral processing experience, discovered that this may be due to partial oxidation and contamination of the ore surface. To eliminate this oxidation and contamination, they decided to subject the mud ore to an acid wash process. For acidic mineral raw materials, oxalic acid was added to the mineral surface before flotation to clean and activate the sulfide minerals. Oxalic acid, as an organic acid, possesses strong chelating and reducing properties, effectively reacting with oxides and contaminants on the mineral surface, removing them. Oxalic acid also interacts with the sulfide minerals, altering their surface properties and making them easier to capture and recover during flotation. After acid washing, the molybdenum and bismuth recoveries reached 62.55% and 15.94%, respectively, representing increases of 16.12 and 5.13 percentage points compared to the non-acid wash process.

[0052] 2. Compared to existing technologies that use acidic flotation conditions for mixed scheelite and fluorite, oxalic acid reacts more effectively with metal ions on the fluorite surface under acidic conditions, forming stable complexes. This helps enhance the hydrophobicity of fluorite particles, making them more easily captured by the flotation agent and floated to the slurry surface. This enhances the flotation of fluorite while minimizing interference with the flotation of scheelite.

[0053] 3. On the basis of the above, compared with the existing technology, the demagnetization followed by flotation beneficiation process is adopted to remove magnetic minerals, so as to avoid the corrosion of strong magnetic equipment by the full-floating tailings of sulfide ore.

[0054] 4. Compared to existing flotation equipment, a new scraper cleaning method is adopted. The front and back surfaces of the scraper are flushed at different points using flushing pipes to prevent the surface from sticking to the flotation minerals, which can contaminate the rotating shaft and bearing assembly. In serious cases, this can affect the normal operation of the scraper and cause surface agglomeration. By timely flushing of the front and back surfaces and appropriately adjusting the flushing direction at different times, cleaning is achieved after each scraping, thereby solving the problem of surface sticking of flotation minerals and causing agglomeration. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 Schematic diagram of the internal structure of the flotation machine of the present invention;

[0056] Figure 2 For the present invention Figure 1 A partial schematic diagram of the middle scraping bubble mechanism;

[0057] Figure 3 for Figure 2 Position relationship diagram of the middle traction plate and the arc groove;

[0058] Figure 4 is a position relationship diagram of the rotating disk and the elastic limiting pin 2;

[0059] Figure 5 This is a diagram showing the position relationship between the movable plate and the connecting plate.

[0060] In the figure: 100, slurry tank; 101, driver 1; 102, driver 2; 103, flotation tube; 104, flow stabilizing plate; 105, drive shaft; 106, mixing sleeve; 107, flow distributor; 108, air inlet pipe; 109, ore pipe; 111, recovery tank; 112, bubble scraper; 113, pulling plate; 1121, connecting plate; 1122, movable plate; 1123, limit plate; 1124, flushing pipe; 1125, guide wheel; 1126, rotating disk; 1127, arc groove; 11271, elastic limit pin 1; 11272, elastic limit pin 2; 1128, rotating shaft; 1129, connecting rope; 113, pulling plate; 1131, sliding body; 1132, rotating body. DETAILED DESCRIPTION

[0061] 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.

[0062] 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.

[0063] Example 1

[0064] The beneficiation process for recovering scheelite and fluorite from argillized tungsten polymetallic ore is as follows:

[0065] Step 1: Removal of magnetite

[0066] The multi-metallic mineral is ground and then the ground material is screened to obtain the mineral to be selected. The particle size of the mineral to be selected is -74μm, accounting for 80%-95% by weight. The mineral is prepared into a slurry with a concentration of 30%. The mineral is passed through a permanent magnetic separator with a magnetic field strength of 4500 Gauss to remove magnetite from the slurry.

[0067] Step 2: Removal of weak magnetic separation minerals

[0068] The slurry from which magnetite has been removed is fed into a strong magnetic separator with a magnetic field strength of 1.0 Tesla to 1.3 Tesla to remove weak magnetic minerals;

[0069] Step 3: Acidification to remove sulfide ore

[0070] The slurry after weak magnetic separation is sent to the mixing tank and oxalic acid, water glass, ethylthiocyanate, butyl xanthate, and BK-205 are added. After the components are fully mixed, they are sent to the flotation machine together to remove the sulfide ore by flotation.

[0071] Step 4: Scheelite-fluorite mixed selection

[0072] The pulp from which the sulfide ore has been removed is fed into a mixing tank, and oxalic acid, water glass, and collector LLR are added and stirred for at least 30 minutes. The stirred pulp is then fed into a flotation machine, and after three flotation operations (one coarse and two fine), a scheelite-fluorite mixed concentrate is obtained.

[0073] Step 5, centrifugation

[0074] The scheelite-fluorite mixed concentrate is fed into a centrifugal concentrator. After the heavy minerals obtained by the centrifugal concentrator are concentrated to a concentration of 30%, they are fed into the centrifugal concentrator again. This process is repeated four times. The heavy minerals finally obtained are scheelite concentrate, and the centrifugal roughing tailings are fluorite concentrate. The frequencies of the four centrifugal concentrators are set to 50Hz, 45Hz, 40Hz, and 30Hz respectively.

[0075] In step 3, first add 1kg / t of oxalic acid and stir for 10 minutes, then add 800g / t of water glass and stir for 2 minutes, 100g / t of ethyl thiocyanate and stir for 2 minutes, 50g / t of xanthate and stir for 2 minutes, and 100g / t of BK-205 and stir for 2 minutes.

[0076] Among them, the specific process of flotation removal of sulfide ore:

[0077] Step 31, rough selection

[0078] 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;

[0079] Step 32, Select

[0080] 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;

[0081] Step 33, Precision Scan

[0082] 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;

[0083] Step 34, Scan

[0084] Add 10g / t of BK-205 to the rougher tailings and stir for 1min, and scavenging for 3min to obtain scavenging concentrate and scavenging tailings. The scavenging concentrate is added to the rougher concentrate, and the scavenging tailings are desulfurized ore as the raw ore for scheelite-fluorite mixed selection.

[0085] In step 4, 4 kg / t of oxalic acid was first added and stirred for 30 min, and then 1 kg / t of water glass was added and stirred for 2 min, and 1 kg of scavenger LLR was added and stirred for 2 min.

[0086] Under the conditions that the original ore contains 0.48% tungsten and 23.29% fluorite, and under the conditions that the strong magnetic tailings contain 0.34% tungsten and 25.65% fluorite, after experiments, we can obtain scheelite concentrate with 17.96% tungsten and a cumulative recovery rate of 20.42%; fluorite concentrate with 77.86% fluorite and a cumulative recovery rate of 47.72%.

[0087] Table: Test data of products in each step

[0088]

[0089] Example 2

[0090] In the above scheme, if Figures 2 to 5 As shown, the flotation machine includes a pulp tank 100, on which a driver 101 and a driver 2 102 are installed, both of which are reduction motor units. A flow stabilizer 104 is provided at the bottom of the pulp tank 100, and the flow stabilizer 104 is used to reduce the eddy current of the pulp in the pulp tank 100, avoid the occurrence of waves, and ensure efficient flotation.

[0091] The flotation mechanism includes a flotation tube 103, a drive shaft 105 is installed inside the flotation tube 103, the top of the drive shaft 105 is connected to the driver 101, a mixing sleeve 106 is provided at the bottom of the flotation tube 103, and a flow divider 107 is provided at the bottom of the drive shaft 105. The flow divider 107 is located at the inner bottom of the mixing sleeve 106. The mixing sleeve 106 is used to mix the components, and then the components are ejected into the slurry tank 100 at high speed through the flow divider 107.

[0092] The air inlet pipe 108 is arranged obliquely downward, and the bottom of the air inlet pipe 108 is connected to the flotation pipe 103, and the top of the air inlet pipe 108 is higher than the liquid level of the slurry tank 100. It supplies air to the interior during mixing and jetting, and cooperates with the reagent to achieve efficient flotation.

[0093] The mineral material pipe 109 and the reagent pipe 110 are both connected to the flotation tube 103 and the inlet height of the mineral material pipe 109 to the flotation tube 103 is greater than the inlet height of the reagent pipe 110 to the flotation tube 103. The mixture of mineral material, reagent and air is dispersed outward by the diverter 107.

[0094] Recovery tank 111, which is provided on one side of the slurry tank 100;

[0095] The bubble scraping mechanism includes a bubble scraping plate 112 , which is connected to the second driver 102 via a rotating shaft 1128 and is used to clean bubbles into the recovery tank 111 .

[0096] Among them, the scraping bubble plate 112 includes a connecting plate 1121 and a movable plate 1122, one end of the connecting plate 1121 is fixed on the rotating shaft 1128, and the other end of the connecting plate 1121 is socket-slidingly fitted on the movable plate 1122, and the movable plate 1122 is a hollow plate. When scraping bubbles, the movable plate 1122 can float on the surface of the slurry liquid. A movable bin is provided on one side of the movable plate 1122 and a limiting plate 1123 is installed at the end of the movable bin. A fluid blocking fluid can be provided on the limiting plate 1123, which blocks the flushing water flow from entering the slurry tank 100 and drains it into the recovery tank 111. The connecting plate 1121 slides in the movable bin and is limited to the maximum extension stroke by the limiting plate 1123.

[0097] The foam scraping mechanism also includes a flushing pipe 1124, a guide wheel 1125 and a pulling plate 113. The flushing pipe 1124 is used to flush the foam on the surface of the movable plate 1122. Rotating disks 1126 are installed at both ends of the flushing pipe 1124. The rotating disk 1126 is rotatably installed on the inner side of the slurry tank 100. The guide wheel 1125 is installed on the side of the slurry tank 100. An arc groove 1127 is provided on the inner side of the slurry tank 100. The center of the arc groove 1127 is located on the axis of the rotating shaft 1128. The interior of the arc groove 1127 slides with the pulling plate 113. The pulling plate 113 is pulled by The connecting rope 1129 is connected to the rotating disk 1126 and the connecting rope 1129 is wrapped around the guide wheel 1125. The pulling plate 113 includes a sliding body 1131 and a rotating body 1132. The sliding body 1131 slides in the arc groove 1127. The rotating body 1132 is rotatably mounted on the sliding body 1131 and a torsion spring is installed on the rotating node. An elastic limit pin 11271 is installed inside the arc groove 1127 to limit the sliding body 1131. An elastic limit pin 2 11272 is installed on the inner side of the slurry tank 100 to limit the deflection angle of the rotating disk 1126. The elastic limit pin 1 1271 and the elastic limit pin 2 11272 both include a fixed sleeve, a movable pin is inserted in the fixed sleeve, and a blocking plate and a limiting plate are provided on the movable pin. The blocking plate and the limiting plate are respectively located on both sides of the fixed sleeve, and a spring is provided on the outer side of the movable pin between the limiting plate and the fixed sleeve. The limiting surface of the movable pin is an arc surface, and the limit release can be completed by only overcoming the force of the limiting surface.

[0098] The slurry flotation operation:

[0099] Step 1: Slurry and reagents enter

[0100] After the ore pulp and reagent are preliminarily mixed, they enter the mixing sleeve 106 of the flotation tube 103 through the ore pipe 109 for mixing;

[0101] Step 2: Mix the components

[0102] Driver 101 drives the drive shaft 105 to rotate, dispersing the slurry and reagent mixture from the inside through the distributor 107 to the outside into the slurry tank 100. At the same time, air enters the mixing sleeve 106 through the air inlet pipe 108, achieving full mixing of the slurry, reagent and air.

[0103] Step 3, scrape the foam

[0104] The reagent captures the corresponding minerals in the slurry and causes the bubbles to float. The second driver 102 drives the rotating shaft 1128 to rotate. Under the action of gravity, the movable plate 1122 first moves downward along the connecting plate 1121 until the movable plate 1122 floats on the liquid surface. As the rotating shaft 1128 rotates, the bottom of the movable plate 1122 always moves along the liquid surface, transporting the bubbles into the recovery tank 111.

[0105] Step 4. Clean up

[0106] After the movable plate 1122 transports the bubbles into the recovery tank 111, the flushing pipe 1124 flushes the bubble-pushing surface of the movable plate 1122. As the movable plate 1122 rotates, it contacts the flushing pipe 1124 and drives the flushing pipe 1124 to rotate relative to the slurry tank 100 to the final position. The rotating disk 1126 is limited by the elastic limiting pin 11272. At this time, the flushing pipe 1124 flushes the non-bubble-pushing surface of the movable plate 1122, and the flushing water and foam enter the recovery tank 111.

[0107] Step 5, Reset

[0108] As the movable plate 1122 continues to move, the movable plate 1122 moves downward relative to the connecting plate 1121, the exposed length of the connecting plate 1121 decreases, and the movable plate 1122 acts on the rotating body 1132. The rotating body 1132 and the movable plate 1122 move to the initial position together. When moving to the initial position, the flushing pipe 1124 returns to the initial position. At this time, the sliding body 1131 is restricted by the elastic limiting pin 11271; after moving to the initial position, as the movable plate 1122 continues to rotate, the rotating body 1132 deflects relative to the sliding body 1131 and compresses the torsion spring. When the movable plate 1122 passes the rotating body 1132, the rotating body 1132 is reset under the action of the torsion spring.

[0109] Repeat steps 1 to 5 until the flotation operation is completed.

[0110] 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 beneficiation process for recovering scheelite and fluorite from argillaceous tungsten polymetallic ore, characterized in that: Here are the steps: Step 1: Removal of magnetite The polymetallic mineral is ground and then the ground material is screened to obtain the mineral to be selected, in which the particle size of the mineral to be selected is -74μm, accounting for 80%-95% by weight. The mineral is then mixed into a slurry with a concentration of 30%. The mineral is passed through a permanent magnetic separator with a magnetic field strength of 4500 Gauss to remove magnetite from the slurry. Step 2: Removal of weak magnetic separation minerals The slurry from which magnetite has been removed is fed into a strong magnetic separator with a magnetic field strength of 1.0 Tesla to 1.3 Tesla to remove weak magnetic minerals; Step 3: Acidification to remove sulfide ore The slurry after weak magnetic separation is sent to the mixing barrel and oxalic acid, water glass, ethylthiocyanate, butyl xanthate, and BK-205 are added. After mixing, the mixture is sent to the flotation machine to remove the sulfide ore by flotation. Step 4: Scheelite-fluorite mixed selection The pulp from which the sulfide ore has been removed is fed into a mixing tank, where oxalic acid, water glass, and collector LLR are added and stirred for at least 30 minutes. The stirred pulp is then fed into a flotation machine, where it undergoes three flotation operations (one coarse and two fine) to obtain a scheelite-fluorite mixed concentrate. Step 5, centrifugation The scheelite-fluorite mixed concentrate is fed into a centrifugal concentrator. After the heavy minerals obtained by the centrifugal concentrator are concentrated to a concentration of 30%, they are fed into the centrifugal concentrator again. This process is repeated four times. The heavy minerals finally obtained are scheelite concentrate, and the centrifugal roughing tailings are fluorite concentrate. The frequencies of the four centrifugal concentrators are set to 50Hz, 45Hz, 40Hz, and 30Hz respectively.

2. The beneficiation process for recovering scheelite and fluorite from argillaceous tungsten polymetallic ore according to claim 1, characterized in that: In step 3, first add 1kg / t of oxalic acid and stir for 10 minutes, then add 800g / t of water glass and stir for 2 minutes, 100g / t of ethyl thiocyanate and stir for 2 minutes, 50g / t of xanthate and stir for 2 minutes, and 100g / t of BK-205 and stir for 2 minutes.

3. The beneficiation process for recovering scheelite and fluorite from argillaceous tungsten polymetallic ore according to claim 1, characterized in that: The specific process of flotation removal of sulfide ore: Step 31, rough selection After mixing, all components are sent to the flotation machine for roughing for 4 minutes to obtain roughing concentrate and roughing tailings; Step 32, Select 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; Step 33, Precision Scan 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; Step 34, Scan Add 10g / t of BK-205 to the rougher tailings, stir for 1min, and scavenging for 3min to obtain scavenging concentrate and scavenging tailings. The scavenging concentrate is added to the rougher concentrate, and the scavenging tailings are desulfurized ore as the raw ore for scheelite-fluorite mixed selection.

4. The beneficiation process for recovering scheelite and fluorite from argillaceous tungsten polymetallic ore according to claim 1, characterized in that: In step 4, 4 kg / t of oxalic acid was first added and stirred for 30 minutes, and then 1 kg / t of water glass was added and stirred for 2 minutes, and 1 kg / t of scavenger LLR was added and stirred for 2 minutes.

5. The beneficiation process for recovering scheelite and fluorite from argillaceous tungsten polymetallic ore according to any one of claims 1 to 4, characterized in that: The flotation machine comprises a pulp tank (100), a driver 1 (101) and a driver 2 (102) are installed on the pulp tank (100), and a flow stabilizing plate (104) is provided at the bottom of the pulp tank (100); The flotation mechanism comprises a flotation tube (103), a driving shaft (105) is installed inside the flotation tube (103), the top of the driving shaft (105) is connected to the driver (101), a mixing sleeve (106) is provided at the bottom of the flotation tube (103), a fluid distributor (107) is provided at the bottom of the driving shaft (105), and the fluid distributor (107) is located at the inner bottom of the mixing sleeve (106); An air inlet pipe (108), the air inlet pipe (108) is arranged obliquely downward, the bottom of the air inlet pipe is connected to the flotation pipe (103), and the top of the air inlet pipe (108) is higher than the liquid level of the slurry tank (100); The mineral material pipe (109) is connected to the flotation pipe (103), and the mixture of mineral material, reagent and air is dispersed outward by the diverter (107); A recovery trough (111), the recovery trough (111) is arranged on one side of the slurry trough (100); The bubble scraping mechanism comprises a bubble scraping plate (112), which is connected to the second driver (102) via a rotating shaft (1128) and is used for cleaning bubbles into a recovery tank (111).

6. The beneficiation process for recovering scheelite and fluorite from argillaceous tungsten polymetallic ore according to claim 5, characterized in that: The bubble scraping plate (112) comprises a connecting plate (1121) and a movable plate (1122), one end of the connecting plate (1121) is fixed on the rotating shaft (1128), and the other end of the connecting plate (1121) is socket-slidingly engaged with the movable plate (1122), the movable plate (1122) is a hollow plate, a movable bin is provided on one side of the movable plate (1122), and a limiting plate (1123) is installed at the end of the movable bin, the connecting plate (1121) is slidingly engaged in the movable bin and the maximum extension stroke is limited by the limiting plate (1123).

7. The beneficiation process for recovering scheelite and fluorite from argillaceous tungsten polymetallic ore according to claim 6, characterized in that: The foam scraping mechanism further comprises a flushing pipe (1124), a guide wheel (1125) and a pulling plate (113). The flushing pipe (1124) is used to flush foam on the surface of the movable plate (1122). Rotating disks (1126) are installed at both ends of the flushing pipe (1124). The rotating disks (1126) are rotatably installed on the inner side of the slurry tank (100). The guide wheel (1125) is installed on the side of the slurry tank (100). An arc groove (1127) is provided on the inner side of the slurry tank (100). The center of the arc groove (1127) is located on the axis of the rotating shaft (1128). The interior of the arc groove (1127) is slidably matched with the pulling plate (113). The pulling plate (113) The pulling plate (113) is connected to the rotating disk (1126) via a connecting rope (1129) which is wound around the guide wheel (1125). The pulling plate (113) includes a sliding body (1131) and a rotating body (1132). The sliding body (1131) is slidably fitted in the arc groove (1127). The rotating body (1132) is rotatably mounted on the sliding body (1131) and a torsion spring is installed at the rotating node. An elastic limiting pin 1 (11271) is installed inside the arc groove (1127) for limiting the sliding body (1131). An elastic limiting pin 2 (11272) is installed on the inner side of the slurry tank (100) for limiting the deflection angle of the rotating disk (1126).

8. The beneficiation process for recovering scheelite and fluorite from argillaceous tungsten polymetallic ore according to claim 7, characterized in that: The slurry flotation operation: Step 1: Slurry and reagents enter After the ore pulp and the reagent are preliminarily mixed, they enter the mixing sleeve (106) of the flotation tube (103) through the ore pipe (109) for mixing; Step 2: Mix the components The first driver (101) drives the driving shaft (105) to rotate, dispersing the ore pulp and reagent mixture from the inside through the distributing fluid (107) to the outside and entering the ore pulp tank (100). At the same time, air enters the mixing sleeve (106) through the air inlet pipe (108), thereby achieving full mixing of the ore pulp, reagent and air. Step 3, scrape the foam The reagent captures the corresponding minerals in the slurry and causes the bubbles to float up. The second driver (102) drives the rotating shaft (1128) to rotate. The movable plate (1122) first moves downward along the connecting plate (1121) under the action of gravity until the movable plate (1122) floats on the liquid surface. As the rotating shaft (1128) rotates, the bottom of the movable plate (1122) always moves along the liquid surface, transporting the bubbles to the recovery tank (111); Step 4. Clean up After the movable plate (1122) transports the bubbles into the recovery tank (111), the flushing pipe (1124) flushes the bubble-pushing surface of the movable plate (1122). As the movable plate (1122) rotates, it contacts the flushing pipe (1124) and drives the flushing pipe (1124) to rotate relative to the slurry tank (100) to a final position. The rotating disk (1126) is limited by the elastic limiting pin 2 (11272). At this time, the flushing pipe (1124) flushes the non-bubble-pushing surface of the movable plate (1122), and the flushing water and foam enter the recovery tank (111). Step 5, Reset As the movable plate (1122) continues to move, the movable plate (1122) moves downward relative to the connecting plate (1121), and the external leakage length of the connecting plate (1121) decreases. The movable plate (1122) acts on the rotating body (1132), and the rotating body (1132) and the movable plate (1122) move to the initial position together. When moving to the initial position, the flushing pipe (1124) returns to the initial position. At this time, the sliding body (1131) is restricted by the elastic limiting pin (11271); after moving to the initial position, as the movable plate (1122) continues to rotate, the rotating body (1132) deflects relative to the sliding body (1131) and compresses the torsion spring. When the movable plate (1122) passes the rotating body (1132), the rotating body (1132) is reset under the action of the torsion spring. Repeat steps 1 to 5 until the flotation operation is completed.

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