Mineral processing technology for recovering scheelite and fluorite from argillized tungsten polymetallic ore

Abstract

The invention discloses a beneficiation process for beneficiation and recovery of scheelite and fluorite from argillized tungsten polymetallic ore. The beneficiation process sequentially comprises the steps of magnetite removal, low-intensity magnetic separation mineral removal, sulphide ore removal through acidification, scheelite-fluorite mixed concentration and centrifugal separation to obtain scheelite concentrate and fluorite concentrate. By adopting magnetic separation and flotation operation, corrosion to equipment can be reduced, meanwhile, the grade and the recovery rate of the scheelite concentrate and the fluorite can be improved, and under the condition that the strong magnetic tailings contain 0.34% of tungsten and 25.65% of fluorite, the scheelite concentrate with the tungsten content of 17.96% and the accumulative recovery rate of 20.42% can be obtained through tests; the content of fluorite in the fluorite concentrate is 77.86%, and the accumulative recovery rate is 47.72%.

Description

Technical Field

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

[0002] my country is a major producer of nonferrous metals, and has huge reserves of tungsten-associated fluorite polymetallic ore resources. The crushing process currently used for this type of ore is generally a three-stage and one-closed-circuit crushing method. The final crushing particle size is -15mm, accounting for about 90%. The grinding and classification process used is a closed-circuit formation of ball milling and cyclone or spiral classifier classification. The flotation principle process is sulfide ore flotation → scheelite flotation or sulfide ore flotation → white tungsten mixed flotation → 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 of sulfide ore. The inventors have found through research 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 mineral processing of scheelite and fluorite.

[0005] 2. In the existing mineral processing technology, the recovery of scheelite is mostly carried out under neutral or alkaline conditions. For example, in CN112354684A, whether sodium carbonate or mixed alkali is used as the pH adjuster, the 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 obtained 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 muddy tungsten polymetallic ore is as follows:

[0009] Step 1: Removal of magnetite

[0010] The multi-metallic minerals are ground, and then the ground materials are screened to obtain the minerals to be selected, wherein the particle size of the minerals to be selected is -74μm, accounting for 80%-95% by weight, and the minerals are prepared into a slurry with a concentration of 30%. The minerals are 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 sent to 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 from which weak magnetic separation minerals have been removed is sent to a mixing barrel and oxalic acid, water glass, ethylthiocyanate, butyl xanthate, and BK-205 are added. After all components are fully mixed, they are sent to a flotation machine together to remove sulfide minerals by flotation.

[0015] Step 4: Scheelite-fluorite mixed selection

[0016] The pulp from which the sulfide ore has been removed is sent to a mixing barrel, and oxalic acid, water glass, and collector LLR are added and stirred for at least 30 minutes. The stirred pulp is sent to a flotation machine, and after three flotation operations of "one rough and two fine", a mixed concentrate of scheelite and fluorite is obtained;

[0017] Step 5, centrifugation

[0018] The scheelite-fluorite mixed concentrate is sent to the centrifugal concentrator. After the heavy minerals obtained by the centrifugal concentrator are concentrated to a concentration of 30%, they are sent to the centrifugal concentrator again. This process is repeated 4 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 in sequence 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 together 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 rough concentrate, stir for 1min, and concentrate for 3min to obtain concentrated concentrate and concentrated tailings;

[0025] Step 33, Precision Scan

[0026] Add 10g / t of ethyl thiocyanate to the selected tailings, stir for 1min, and perform fine sweeping for 3min to obtain fine sweep concentrate and fine sweep tailings;

[0027] Step 34, Scan

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

[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, on which a driver 1 and a driver 2 are installed, and a flow stabilizing plate is provided at the bottom of the pulp tank;

[0031] The flotation mechanism comprises a flotation tube, a driving shaft is installed inside the flotation tube, the top of the driving shaft is connected to the driver, a mixing sleeve is arranged at the bottom of the flotation tube, a flow divider is arranged at the bottom of the driving shaft, and the flow divider is located at the inner bottom of the mixing sleeve;

[0032] An air inlet pipe, which is arranged obliquely downward and has a bottom connected to the flotation pipe and a 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 distributing fluid.

[0034] A recovery tank, which is arranged on one side of the slurry tank;

[0035] The bubble scraping mechanism comprises 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 scraper 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-slidably 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 slidably fitted in the movable bin and the maximum extension stroke is limited by the limiting plate.

[0037] Preferably, the 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 wound 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 initially 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 disperses the slurry and reagent mixture from the inside to the outside through the distribution fluid and enters the slurry tank. At the same time, the 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. The movable plate first moves down along the connecting plate under the action of gravity 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 to transport the bubbles to the recovery tank.

[0045] Step 4. Clean up

[0046] After the movable plate transports the bubbles to 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 to the final position relative to the slurry tank. The rotating disk is limited by the elastic limit pin. 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 moves to the initial position together with the movable plate. When moving to the initial position, the flushing pipe returns to the initial position, and the sliding body is limited 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. In the prior art, the recovery rates of molybdenum and bismuth in the full flotation process of sulfide ore are unstable and the recovery rate of bismuth is poor. The inventor has found through many years of experience in mineral processing that this may be caused by partial oxidation and contamination of the ore surface. In order to eliminate the oxidation and contaminated surface, it is decided to carry out an acid washing process for the mud ore. For acidic mineral raw materials, oxalic acid is added to the mineral surface before flotation to clean and activate the sulfide mineral. Oxalic acid, as an organic acid, has strong chelating ability and reducing property, and can effectively react with oxides and pollutants on the mineral surface to remove them from the mineral surface. At the same time, oxalic acid can also react with sulfide minerals to change the properties of their surface, making them easier to be captured and recovered during the flotation process. After acid washing, the recovery rates of molybdenum and bismuth reached 62.55% and 15.94%, respectively, which were 16.12 and 5.13 percentage points higher than those of the non-acid washing process.

[0052] 2. Compared with the prior art that uses acidic conditions to float mixed scheelite-fluorite ore, under acidic conditions, oxalic acid can more effectively react with metal ions on the surface of fluorite to form a stable complex. This helps to enhance the hydrophobicity of fluorite particles, making it easier for them to be captured by the flotation agent and float to the surface of the pulp. This can enhance the flotation effect of fluorite while minimizing the 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 fully floated tailings of sulfide ore.

[0054] 4. Compared with the existing flotation equipment, a new scraper cleaning method is adopted, and the front and back sides of the scraper are washed at different points using a flushing pipe to prevent the surface from sticking to the flotation minerals, polluting the rotating shaft and the bearing assembly position, and in serious cases affecting the normal operation of the scraper and the surface agglomeration. Through timely flushing of the front and back sides and appropriate adjustments to the flushing direction at different times, cleaning is achieved after each scraping, thereby solving the problem of surface sticking to the flotation minerals and causing agglomeration. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a 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 positional relationship diagram of 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 intake 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 described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0062] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] Example 1

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

[0065] Step 1: Removal of magnetite

[0066] The multi-metallic minerals are ground, and then the ground materials are screened to obtain the minerals to be selected, wherein the particle size of the minerals to be selected is -74μm, accounting for 80%-95% by weight, and the minerals are prepared into a slurry with a concentration of 30%. The minerals are 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 sent to 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 from which weak magnetic separation minerals have been removed is sent to a mixing barrel and oxalic acid, water glass, ethylthiocyanate, butyl xanthate, and BK-205 are added. After all components are fully mixed, they are sent to a flotation machine together to remove sulfide minerals by flotation.

[0071] Step 4: Scheelite-fluorite mixed selection

[0072] The pulp from which the sulfide ore has been removed is sent to a mixing barrel, and oxalic acid, water glass, and collector LLR are added and stirred for at least 30 minutes. The stirred pulp is sent to a flotation machine, and after three flotation operations of "one rough and two fine", a mixed concentrate of scheelite and fluorite is obtained;

[0073] Step 5, centrifugation

[0074] The scheelite-fluorite mixed concentrate is sent to the centrifugal concentrator. After the heavy minerals obtained by the centrifugal concentrator are concentrated to a concentration of 30%, they are sent to the centrifugal concentrator again. This process is repeated 4 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] Wherein, 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 together 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 rough concentrate, stir for 1min, and concentrate for 3min to obtain concentrated concentrate and concentrated tailings;

[0081] Step 33, Precision Scan

[0082] Add 10g / t of ethyl thiocyanate to the selected tailings, stir for 1min, and perform fine sweeping for 3min to obtain fine sweep concentrate and fine sweep tailings;

[0083] Step 34, Scan

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

[0085] Wherein, 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.

[0086] Under the conditions that the original ore contains 0.48% tungsten and 23.29% fluorite, and 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 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 arranged at the bottom of the flotation tube 103, a flow divider 107 is arranged at the bottom of the driving shaft 105, and the flow divider 107 is located at the inner bottom of the mixing sleeve 106. The mixing sleeve 106 is used for mixing the components, and then ejecting them 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 is connected to the flotation pipe 103, and the top is higher than the liquid level of the slurry tank 100. It supplies air to the inside 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 flow divider 107.

[0094] A recovery tank 111, which is disposed on one side of the slurry tank 100;

[0095] The bubble scraping mechanism includes a bubble scraping plate 112 , which is connected to the driver 2 102 via a rotating shaft 1128 and is used to clean the 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-slidably 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 baffle can be provided on the limiting plate 1123, and the baffle blocks the flushing water flow from entering the slurry tank 100 and drains it into the recovery tank 111. The connecting plate 1121 is slidably fitted in the movable bin and the maximum extension stroke is limited 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 inner side of the arc groove 1127 slides with the pulling plate 113. The pulling plate 113 is pulled by the rotating shaft 1128. The connecting rope 1129 is connected to the rotating disk 1126 and the connecting rope 1129 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 installed 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, a baffle and a limit plate are provided on the movable pin, the baffle and the limit plate are respectively located on both sides of the fixed sleeve, and a spring is mounted on the outer side of the movable pin between the limit plate and the fixed sleeve. The limit surface of the movable pin is an arc surface, and the limit release can be completed by only overcoming the force of the limit 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] The driver 101 drives the driving shaft 105 to rotate, and the slurry and reagent mixture is dispersed from the inside to the outside through the distributing fluid 107 and enters the slurry tank 100. At the same time, the air enters the mixing sleeve 106 through the air inlet pipe 108, so as to achieve 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 the bubbles float up. The second driver 102 drives the rotating shaft 1128 to rotate. The movable plate 1122 moves down 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 to transport the bubbles to 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 to the final position relative to the slurry tank 100. 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, 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 moves to the initial position together with the movable plate 1122. When moving to the initial position, the flushing pipe 1124 returns to the initial position. At this time, the sliding body 1131 is limited 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 is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. The replacement may be a replacement of a part of the structure, device, method step, or a complete technical solution. Any equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A beneficiation process for recovering scheelite and fluorite from muddy tungsten polymetallic ore, characterized in that: Here are the steps: Step 1: Removal of magnetite The multi-metallic minerals are ground, and then the ground materials are screened to obtain the minerals to be selected, wherein the particle size of the minerals to be selected is -74μm, accounting for 80%-95% by weight, and the minerals are prepared into a slurry with a concentration of 30%. The minerals are 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 sent to 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 from which weak magnetic separation minerals have been removed is sent to a mixing barrel and oxalic acid, water glass, ethylthiocyanate, butyl xanthate, and BK-205 are added. After mixing, the mixture is sent to a flotation machine to remove sulfide minerals by flotation. Step 4: Scheelite-fluorite mixed selection The pulp from which the sulfide ore has been removed is sent to a mixing barrel, and oxalic acid, water glass, and collector LLR are added and stirred for at least 30 minutes. The stirred pulp is sent to a flotation machine, and after three flotation operations of "one rough and two fine", a mixed concentrate of scheelite and fluorite is obtained; Step 5, centrifugation The scheelite-fluorite mixed concentrate is sent to the centrifugal concentrator. After the heavy minerals obtained by the centrifugal concentrator are concentrated to a concentration of 30%, they are sent to the centrifugal concentrator again. This process is repeated 4 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 ore dressing process for recovering scheelite and fluorite from muddy tungsten polymetallic ore according to claim 1 is 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 ore dressing process for recovering scheelite and fluorite from muddy tungsten polymetallic ore according to claim 1 is 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 together for roughing for 4 minutes to obtain roughing concentrate and roughing tailings; Step 32, Select Add 200g / t of water glass to the rough concentrate, stir for 1min, and concentrate for 3min to obtain concentrated concentrate and concentrated tailings; Step 33, Precision Scan Add 10g / t of ethyl thiocyanate to the selected tailings, stir for 1min, and perform fine sweeping for 3min to obtain fine sweep concentrate and fine sweep tailings; Step 34, Scan Add 10g / t BK-205 to the rougher tailings, stir for 1min, and scavenge for 3min to obtain scavenge concentrate and scavenge tailings. The scavenge concentrate is added to the rougher concentrate, and the scavenge tailings are desulfurized ore as the raw ore for mixed scheelite-fluorite selection.

4. The ore dressing process for recovering scheelite and fluorite from muddy tungsten polymetallic ore according to claim 1 is 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. A beneficiation process for recovering scheelite and fluorite from muddy 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 arranged 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 arranged at the bottom of the flotation tube (103), a flow divider (107) is arranged at the bottom of the driving shaft (105), and the flow divider (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); A mineral material pipe (109), the mineral material pipe (109) is connected to the flotation pipe (103), and a mixture of mineral material, reagent and air is dispersed outward by a distributing fluid (107); A recovery tank (111), wherein the recovery tank (111) is arranged on one side of the slurry tank (100); The bubble scraping mechanism comprises a bubble scraping plate (112), the bubble scraping plate (112) 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 ore dressing process for recovering scheelite and fluorite from muddy tungsten polymetallic ore according to claim 5 is 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); the other end of the connecting plate (1121) is slidably fitted on the movable plate (1122) in a socket-shaped manner; 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 slidably fitted in the movable bin and the maximum extension stroke is limited by the limiting plate (1123).

7. The ore dressing process for recovering scheelite and fluorite from muddy tungsten polymetallic ore according to claim 6 is 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 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) 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 a guide wheel (1125). The pulling plate (113) comprises a sliding body (1131) and a rotating body (1132). The sliding body (1131) is slidably fitted in an arc groove (1127). The rotating body (1132) is rotatably mounted on the sliding body (1131) and a torsion spring is mounted on a rotating node. An elastic limiting pin 1 (11271) is mounted inside the arc groove (1127) for limiting the sliding body (1131). An elastic limiting pin 2 (11272) is mounted on the inner side of the slurry tank (100) for limiting the deflection angle of the rotating disk (1126).

8. The process for recovering scheelite and fluorite from argillaceous tungsten polymetallic ore according to claim 7 is 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 driver 1 (101) drives the driving shaft (105) to rotate, so that the slurry and reagent mixture is dispersed from the inside to the outside through the distributing fluid (107) and enters the slurry tank (100), and at the same time, the air enters the mixing sleeve (106) through the air inlet pipe (108), so that the slurry, reagent and air are fully mixed; Step 3, scrape the foam The reagent captures the corresponding minerals in the ore slurry and the bubbles float up, the second driver (102) drives the rotating shaft (1128) to rotate, and the movable plate (1122) first moves down 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, and the bubbles are transported 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 to a final position relative to the slurry tank (100). The rotating disk (1126) is limited by the second 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); Step 5, Reset As the movable plate (1122) continues to move, the movable plate (1122) moves downward relative to the connecting plate (1121), the external leakage length of the connecting plate (1121) decreases, and 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, and the sliding body (1131) is limited by the elastic limiting pin 1 (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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