A system for efficiently recovering scheelite and fluorite from polymetallic mud ore

Abstract

The present invention discloses a system for efficiently recovering scheelite and fluorite from polymetallic mud ore, comprising a crushing box, a first magnetic separation tank, a second magnetic separation tank, a first mixing tank, a first flotation machine, a second mixing tank, a second flotation machine, and a centrifugal unit, to obtain scheelite concentrate and fluorite concentrate. By adopting the method of first magnetic separation and then flotation, the corrosion of the acidity of the ore pulp on the magnetic separation equipment is reduced. At the same time, the ore pulp is acidic by pickling with oxalic acid. Oxalic acid, as an organic acid, has strong chelating ability and reducing properties, and can effectively react with oxides and pollutants on the surface of the mineral to remove them from the mineral surface. At the same time, oxalic acid can also react with sulfide minerals, changing the properties of their surface, making them easier to be captured and recovered during the flotation process. Under acidic conditions, oxalic acid can more effectively react with metal ions on the surface of fluorite to form stable complexes. The hydrophobicity of fluorite particles is enhanced, so that they are captured by the flotation agent and float to the surface of the ore pulp, thereby enhancing the flotation of fluorite and reducing interference with the flotation of scheelite.

Description

Technical Field

[0001] The present invention belongs to the field of mineral processing technology, and in particular relates to a system for efficiently recovering scheelite and fluorite from polymetallic mud ore. Background Art

[0002] Tungsten is one of the irreplaceable basic materials for the national economy and modern national defense. It is an important strategic material and is widely used in important fields such as aerospace, machinery manufacturing, and defense industry. Therefore, the country attaches great importance to the development and utilization of tungsten resources.

[0003] At present, the difficulty in recycling scheelite lies in the fact that fluorite is associated with non-ferrous metals and rare metals such as tungsten and molybdenum. The relationship between the co-existence of minerals is complex, the types of gangue minerals are diverse, and fluorite is difficult to enrich efficiently. Oleic acid anion collectors have poor selectivity, weak adaptability, and insufficient low-temperature resistance. It is difficult to overcome the effects of calcium-containing gangue minerals, temperature, water quality, impurity ions and other factors on fluorite flotation, resulting in low recovery efficiency of associated fluorite and serious waste of resources.

[0004] Existing beneficiation processes mostly use neutral or alkaline conditions to single-source scheelite. Oxidation and surface denaturation in the raw ore lead to incomplete flotation of the sulfide ore, affecting the subsequent grade of scheelite and fluorite. Furthermore, conventional beneficiation processes perform flotation followed by magnetic separation, which can easily lead to equipment corrosion during magnetic separation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: how to solve the problem that the existing mineral processing technology cannot efficiently recover scheelite fluorite.

[0006] In order to solve the above technical problems, the inventors have come up with the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

[0007] A system for efficiently recovering scheelite and fluorite from polymetallic mud ore, comprising:

[0008] Crushing box, with a discharge port, is equipped with a crushing tooth roller and a roller grinding roller. The crushing tooth roller is circumferentially installed with multiple crushing tooth blocks, which are used to crush the raw ore. The roller grinding roller grinds the crushed raw ore to a particle size of -74μm, accounting for 80%-95% of the total weight.

[0009] Magnetic separation tank 1 is provided with a feed port 1, a discharge port 1 and a tailings port 1. The feed port 1 is connected to the discharge port of the crushing box. A weak magnetic group with a magnetic field strength of 4000 Gauss is installed in the magnetic separation tank 1. The weak magnetic group performs magnetic separation on the slurry to select magnetite and demagnetized ore;

[0010] Magnetic separation tank 2 is provided with a second feed port, a second unloading port and a second tailings port. The second feed port is connected to the first tailings port. A strong magnetic group with a magnetic field strength of 1.0-1.3 Tesla is installed in the magnetic separation tank 2. The strong magnetic group performs magnetic separation on the demagnetized slurry to select wolframite and demagnetized ore.

[0011] A mixing tank is provided with an ore inlet and an ore outlet, the ore inlet is connected to the tailings outlet, and a stirrer, an oxalic acid addition pipe and a reagent addition pipe are installed in the mixing tank. The stirrer is used to fully mix the components to obtain the pickling slurry;

[0012] Flotation machine 1 and flotation machine 2 are used to float the acid-washed slurry to separate the sulfide ore and the desulfurized ore. The flotation machine 1 is provided with a flotation inlet 1, a flotation outlet 1 and a flotation tail outlet 1, and the flotation inlet 1 is connected to the ore outlet 1;

[0013] Mixing tank 2, which is provided with ore inlet 2 and ore outlet 2, and is connected to flotation tail outlet 1. Mixing tank 2 is provided with a stirrer 2, oxalic acid addition pipe 2 and reagent addition pipe 2. Stirrer 2 is used to fully mix the components to obtain pickling mixed ore pulp;

[0014] Flotation machine 2 is installed in the flotation machine to float out scheelite fluorite mixed ore and tailings. Flotation machine 2 is provided with flotation inlet 2, flotation outlet 2 and flotation tail outlet 2. Flotation inlet 2 is connected to ore outlet 2.

[0015] The centrifuge unit is connected to the flotation outlet for gravity separation of scheelite concentrate and fluorite concentrate.

[0016] In this solution, in order to solve the problem of being unable to quickly replace the tooth plate due to the blockage of the bolt holes when replacing the tooth plate, preferably, four pressure-bearing shaft strips are provided on the circumference of the outer side of the crushing tooth roller. The pressure-bearing shaft strips are 3-8 mm thick and have a rectangular cross-section. An adapting groove is provided on the side of the crushing tooth block opposite to the crushing tooth roller. The adapting groove and the pressure-bearing shaft strip are installed with a clearance fit.

[0017] The tooth-breaking blocks are divided into two tooth-breaking blocks: one is symmetrically arranged in two pieces, and the other is symmetrically arranged in two pieces. The sides of the tooth-breaking blocks are fitted together.

[0018] The first crushing tooth block and the second crushing tooth block are both radially installed on the outside of the crushing tooth roller.

[0019] Preferably, a sink is provided in the middle of the side of the crushing tooth block opposite to the crushing tooth roller, a fixed block is installed in the sink, a blind hole is provided on the side of the fixed block opposite to the crushing tooth block, a magnetic moving block is slidably fitted in the blind hole, a fine hole is provided at the root of the blind hole, a connecting main rope is installed in the fine hole, and the connecting main rope is connected to the magnetic moving block;

[0020] The fixed block is integrally provided with a connector on the side facing away from the tooth-breaking block, and a fine hole passes through the connector. At least two groups of symmetrically distributed vertical holes are provided on the side of the connector and communicate with the fine holes. A connecting auxiliary rope connected to the connecting main rope is installed in the vertical holes. An external expansion hole is provided at the end of the vertical hole away from the fine hole. A limit pin and a spring located on the side of the limit pin close to the fine hole are slidably fitted in the external expansion hole. The connecting auxiliary rope passes through the spring and is connected to the limit pin. The end of the limit pin away from the spring is partially exposed on the outside of the connector;

[0021] The pressure-bearing shaft is provided with a socket slot corresponding to the position of the fixed block, and the side of the socket slot is provided with a track groove that slides with the limit pin. The track groove includes a deep groove at the end and a shallow groove at the socket slot slot and connected to the deep groove.

[0022] Preferably, a vertical dovetail slot is provided on one side of the tooth breaking block, and vertical dovetail blocks are provided on two sides of the tooth breaking block. The vertical dovetail slot and the vertical dovetail blocks are installed in a vertical socket-type adapter manner.

[0023] In this solution, in order to solve the problem that the scraping bubbles are not cleaned in time, resulting in condensation on the scraper surface and dripping and adhering to the connection between the rotating shaft and the bearing, causing wear or affecting the concentration operation, preferably, the flotation machine includes a slurry tank, the top of the slurry tank is equipped with a driver 1 and a driver 2, and the bottom of the slurry tank is provided with a flow stabilizer;

[0024] 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;

[0025] 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;

[0026] The ore pipe is connected to the flotation pipe, and the mixture of ore, reagent and air is dispersed outward by the diverter;

[0027] A recovery tank is provided on one side of the slurry tank;

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In this solution, in order to solve the problem of mixing dead corners that easily occur when the components are mixed in the mixing tank, preferably, the agitator 1 and the agitator 2 both include a stirring head and a stirring rod rotatably installed on the side of the stirring head, a gear plate is installed on the top of the stirring head, a sphere is installed on the body of the stirring head, an independently set fixing hoop is installed on the outside of the sphere, the sphere is rotatably installed in the fixing hoop, a gear body is independently engaged with the outside of the gear plate, and the gear body is powered by an independently set servo motor.

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

[0033] 1. The present invention employs magnetic separation followed by flotation to reduce the corrosion of the magnetic separation equipment caused by the acidity of the ore pulp. Furthermore, the ore pulp is acidified by oxalic acid pickling. As an organic acid, oxalic acid has strong chelating and reducing properties, effectively reacting with oxides and contaminants on the mineral surface, removing them. Oxalic acid also interacts with sulfide minerals, altering their surface properties and making them more easily captured and recovered during flotation. After pickling, 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-pickling process. Furthermore, the flotation of the scheelite-fluorite mixed ore is carried out under acidic conditions. Under acidic conditions, oxalic acid more effectively reacts with metal ions on the fluorite surface, forming stable complexes. This helps to enhance the hydrophobicity of the fluorite particles, making them more easily captured by the flotation agent and floating to the ore pulp surface. This enhances the flotation efficiency of the fluorite while minimizing interference with the flotation of the scheelite.

[0034] 2. The present invention also makes structural improvements to the crushing mechanism used in the crushing process. The tooth rollers of the tooth roller crusher need to be replaced after long-term operation due to wear. However, in the past, axial dovetail-shaped socket fitting was used to prevent radial shedding and then bolted. This would require complicated operations to complete the replacement of the crushing tooth plate. At the same time, when crushing minerals, it is easy to cause clogging of the dense mounting holes, which would burden subsequent replacement operations. The present application combines a set of radially non-passive tooth ring parts through a direct radial installation and circumferential adaptation method. During subsequent replacement, it is only necessary to cooperate with the external magnetic block to overcome the spring force and remove the limit pin from the socket to easily complete the replacement operation.

[0035] 3. This invention adopts a novel scraper cleaning method, using flushing pipes to flush the front and back of the scraper at different points 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 caking. By timely flushing of the front and back and appropriately adjusting 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 caking. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the system structure of the present invention;

[0037] Figure 2 for Figure 1 Schematic diagram of the crushing tooth roller structure in the middle crushing box;

[0038] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0039] Figure 4 for Figure 3 Connection diagram of the middle connector and the socket;

[0040] Figure 5 This is a diagram showing the connection between the tooth-crushing block 1 and the tooth-crushing block 2;

[0041] Figure 6 Schematic diagram of the structure inside the mixing tank;

[0042] Figure 7 This is the internal structure diagram of the flotation machine;

[0043] Figure 8 for Figure 7 Schematic diagram of the structure of the middle scraping bubble mechanism;

[0044] Figure 9 for Figure 7 Position relationship diagram of the middle traction plate and the arc groove;

[0045] Figure 10is a position relationship diagram of the rotating disk and the elastic limiting pin 2;

[0046] Figure 11 This is a diagram showing the position relationship between the movable plate and the connecting plate.

[0047] In the figure: 100, slurry tank; 101, driver 1; 102, driver 2; 103, flotation tube; 104, flow stabilizer; 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, limiting plate; 1124, flushing pipe; 1125, guide wheel; 1126, rotating disk; 1127, arc groove; 11271, elastic limiting pin 1; 11272, elastic limiting pin 2; 1128, rotating shaft; 1129, connecting rope; 113, pulling plate; 1131, sliding body; 1132, rotating body.

[0048] 200, crushing box; 201, discharge port; 202, crushing roller; 2021, bearing shaft; 2022, socket slot; 2023, shallow slot; 2024, deep slot; 203, crushing tooth block; 2031, adapter slot; 2032, crushing tooth block 1; 20321, vertical dovetail slot; 2033, crushing tooth block 2; 20331, vertical dovetail block; 2034, fixed block; 2035, blind hole; 2036, magnetic movable block; 2037, main rope connection; 2038, connector; 2039, fine hole; 20310, auxiliary rope connection; 20311, limit pin; 20312, spring;

[0049] 300, magnetic separation tank 1; 301, ore feeding port 1; 302, ore unloading port 1; 303, tailings port 1; 304, weak magnetic group;

[0050] 400, magnetic separation tank 2; 401, ore feeding port 2; 402, ore unloading port 2; 403, tailings port 2; 404, strong magnetic group;

[0051] 500, mixing tank 1; 501, ore inlet 1; 502, ore outlet 1; 504, stirrer 1; 5041, stirring head; 5042, stirring rod; 5043, gear plate; 5044, ball; 5045, fixing hoop; 5047, gear body; 5048, servo motor; 505, oxalic acid addition tube 1; 506, reagent addition tube 1;

[0052] 600, mixing tank 2; 601, ore inlet 2; 602, ore outlet 2; 604, stirrer 2; 605, oxalic acid addition pipe 2; 606, reagent addition pipe 2;

[0053] 700, centrifugal unit;

[0054] 800, flotation machine 1; 801, flotation inlet 1; 802, flotation outlet 1; 803, flotation tail outlet 1;

[0055] 900, flotation machine 2; 901, flotation inlet 2; 902, flotation outlet 2; 903, flotation tail outlet 2. DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] Example 1, as Figure 1 As shown, a system for efficiently recovering scheelite and fluorite from polymetallic mud ore includes:

[0059] A crushing box 200 is provided with a discharge port 201. A crushing tooth roller 202 and a roller grinding roller 204 are provided inside the crushing box 200. The crushing tooth roller 202 is circumferentially provided with a plurality of crushing tooth blocks 203. The crushing tooth blocks 203 are used for crushing the raw ore. The roller grinding roller 204 grinds the crushed raw ore to a particle size of -74μm accounting for 80%-95% of the total weight.

[0060] A magnetic separation tank 300 is provided with a feed port 301, a discharge port 302, and a tailings port 303. The feed port 301 is connected to the discharge port 201 of the crushing box 200. A weak magnetic group 304 with a magnetic field strength of 4000 Gauss is installed in the magnetic separation tank 300. The weak magnetic group 304 performs magnetic separation on the slurry to select magnetite and demagnetized ore.

[0061] The second magnetic separation tank 400 is provided with a second feed port 401, a second unloading port 402, and a second tailings port 403. The second feed port 401 is connected to the first tailings port 303. A strong magnetic group 404 with a magnetic field strength of 1.0-1.3 Tesla is installed in the second magnetic separation tank 400. The strong magnetic group 404 performs magnetic separation on the demagnetized slurry to select wolframite and demagnetized ore.

[0062] A mixing tank 500 is provided with an ore inlet 501 and an ore outlet 502. The ore inlet 501 is connected to the tailings outlet 403. A stirrer 504, an oxalic acid addition pipe 505, and a reagent addition pipe 506 are installed in the mixing tank 500. The stirrer 504 is used to fully mix the components to obtain the pickling slurry.

[0063] Flotation machine 800, flotation machine 800 floats the acid-washed pulp to obtain sulfide ore and desulfurized ore. Flotation machine 800 is provided with a flotation inlet 801, a flotation outlet 802 and a flotation tail outlet 803. The flotation inlet 801 is connected to the ore outlet 502.

[0064] The second mixing tank 600 is provided with a second ore inlet 601 and a second ore outlet 602. The second ore inlet 601 is connected to the first flotation tail outlet 803. The second mixing tank 600 is equipped with a second agitator 604, a second oxalic acid addition pipe 607 and a second reagent addition pipe 606. The second agitator 604 is used to fully mix the components to obtain the acid-washed mixed ore pulp.

[0065] The second flotation machine 900 is equipped with a flotation device for flotating scheelite-fluorite mixed ore and tailings. The second flotation machine 900 is provided with a flotation inlet 901, a flotation outlet 902 and a flotation tail outlet 903. The flotation inlet 901 is connected to the second ore outlet 602.

[0066] The centrifugal unit 700 is connected to the second flotation outlet 902 and is used for re-selecting scheelite concentrate and fluorite concentrate.

[0067] Magnetic separation is performed before flotation to reduce the corrosion of the magnetic separation equipment caused by the acidity of the ore pulp. The ore pulp is also acidified by oxalic acid. As an organic acid, oxalic acid has strong chelating and reducing properties, effectively reacting with oxides and contaminants on the mineral surface, removing them. Oxalic acid also interacts with sulfide minerals, modifying their surface properties and making them more easily captured and recovered during flotation. After acid washing, the recoveries of molybdenum and bismuth reached 62.55% and 15.94%, respectively, representing increases of 16.12 and 5.13 percentage points compared to the non-acid washing process. Furthermore, the flotation of the scheelite-fluorite mixture is performed under acidic conditions. Under acidic conditions, oxalic acid more effectively reacts with metal ions on the fluorite surface, forming stable complexes. This helps to enhance the hydrophobicity of the fluorite particles, making them more easily captured by the flotation agent and floating to the pulp surface. This enhances the flotation efficiency of the fluorite while minimizing interference with the flotation of the scheelite.

[0068] Example 2, in the above-mentioned system, as Figures 2 to 5As shown, four pressure-bearing shafts 2021 are circumferentially arranged on the outer side of the crushing tooth roller 202. The pressure-bearing shafts 2021 are 3-8 mm thick and have a rectangular cross-section. An adapting groove 2031 is provided on the side of the crushing tooth block 203 opposite to the crushing tooth roller 202. The adapting groove 2031 and the pressure-bearing shaft 2021 are installed with clearance fit.

[0069] The tooth-breaking block 203 is divided into a tooth-breaking block 1 2032 and a tooth-breaking block 2 2033. Two tooth-breaking blocks 1 2032 are symmetrically arranged up and down, and two tooth-breaking blocks 2 2033 are symmetrically arranged up and down. The sides of the tooth-breaking block 1 2032 and the tooth-breaking block 2 2033 fit together.

[0070] The tooth-breaking block 1 2032 and the tooth-breaking block 2 2033 are both radially installed on the outside of the tooth-breaking roller 202 to form a tooth-breaking ring member with good integrity and durability.

[0071] The tooth-breaking block 203 is provided with a recessed groove in the middle of a side opposite to the tooth-breaking roller 202, in which a fixed block 2034 is installed. The fixed block 2034 is provided with a blind hole 2035 on a side opposite to the tooth-breaking block 203. A magnetic movable block 2036 is slidably fitted in the blind hole 2035. A fine hole 2039 is provided at the root of the blind hole 2035. A connecting main rope 2037 is installed in the fine hole 2039, connecting the connecting main rope 2037 and the magnetic movable block 2036.

[0072] A connector 2038 is integrally formed on the side of the fixing block 2034 facing away from the tooth-breaking block 203. A fine hole 2039 passes through the connector 2038. At least two groups of symmetrically distributed vertical holes are provided on the side of the connector 2038 and communicate with the fine hole 2039. A connecting secondary rope 20310 connected to the connecting main rope 2037 is installed in the vertical holes. An external expansion hole is provided at the end of the vertical hole away from the fine hole 2039. A limit pin 20311 and a spring 20312 located on the side of the limit pin 20311 near the fine hole 2039 are slidably fitted in the external expansion hole. The connecting secondary rope 20310 passes through the spring 20312 and is connected to the limit pin 20311. The end of the limit pin 20311 away from the spring 20312 is partially exposed on the outside of the connector 2038.

[0073] The pressure-bearing shaft 2021 is provided with a socket slot 2022 corresponding to the position of the fixed block 2034, and the side of the socket slot 2022 is provided with a track groove that slides with the limit pin 20311. The track groove includes a deep groove 2024 located at the end and a shallow groove 2023 located at the slot mouth of the socket slot 2022 and connected to the deep groove 2024.

[0074] like Figure 5As shown, in order to realize radial installation of the gear ring components, the side of the tooth block 1 2032 is provided with a vertical dovetail slot 20321, and the side of the tooth block 2 2033 is provided with a vertical dovetail block 20331. The vertical dovetail slot 20321 and the vertical dovetail block 20331 are installed in a vertical socket-type adapter manner.

[0075] During assembly, first install the second tooth block 2033, then radially install the first tooth block 2032 to form the gear ring. During installation, an electromagnet is added to the outside of the tooth block 203 and energized. This moves the magnetic movable block 2036 outward along the blind hole 2035, pulling the main connecting rope 2037 and the auxiliary connecting rope 20310 to retract the limit pin 20311, compressing the spring 20312 and allowing it to enter the shallow groove 2023 and then the deep groove 2024. The electromagnet is then disconnected from the power supply, and the magnetic movable block 2036 is reset by the spring 20312, causing the limit pin 20311 to mate with the deep groove 2024. To replace the block, the external electromagnet is energized, releasing the limit pin 20311 and deep groove 2024 and removing it from the socket 2022.

[0076] Example 3, in the above-mentioned system, if Figures 7 to 11 As shown, the flotation machine 1 800 and the flotation machine 2 900 both include a slurry tank 100;

[0077] Driver 1 101 and driver 2 102 are installed on the top of the slurry tank 100, and a flow stabilizing plate 104 is provided at the bottom of the slurry tank 100;

[0078] 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;

[0079] The air inlet pipe 108 is arranged obliquely downward, with the bottom connected to the flotation tube 103 and the top higher than the liquid level of the slurry tank 100;

[0080] The ore pipe 109 is connected to the flotation pipe 103, and the mixture of ore, reagent and air is dispersed outward by the diverter 107;

[0081] Recovery tank 111, which is provided on one side of the slurry tank 100;

[0082] 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 bubbles into the recovery tank 111 .

[0083] During operation, driver 101 mixes the slurry with reagents and air, which are then ejected outward by drive shaft 105 and flow divider 107. The flow stabilizer 104 prevents eddy currents from forming. The flotation foam rises and is removed to a recovery tank 111 by a foam scraper 112 driven by driver 2 102 for recycling.

[0084] The scraper 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. The movable plate 1122 is a hollow plate and can float on the liquid surface. It will not cause excessive cleaning of the slurry, thereby improving the recovery rate of scheelite and fluorite. 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 slides in the movable bin and is limited to the maximum extension stroke by the limiting plate 1123. A blocking fluid can be provided on the limiting plate 1123. The blocking fluid blocks the flushing water flow from entering the slurry tank 100 and drains it into the recovery tank 111.

[0085] 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.

[0086] 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.

[0087] As the movable plate 1122 continues to move, the movable plate 1122 moves downward relative to the connecting plate 1121, and the exposed length of the connecting plate 1121 decreases. The movable plate 1122 will act 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 restricted by the elastic limit 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.

[0088] Example 4, in the above-mentioned system, if Figure 6 As shown, in order to solve the problem of mixing dead corners that are easily generated when the components are mixed in the mixing tank, the agitator 1 504 and the agitator 2 604 each include a stirring head 5041 and a stirring rod 5042 rotatably mounted on the side of the stirring head 5041. A gear plate 5043 is mounted on the top of the stirring head 5041, and a sphere 5044 is mounted on the body of the stirring head 5041. An independently arranged fixing hoop 5045 is mounted on the outside of the sphere 5044. The sphere 5044 is rotatably mounted in the fixing hoop 5045. A gear body 5047 is independently engaged on the outside of the gear plate 5043, and the gear body 5047 is powered by an independently arranged servo motor 5048. This design can provide a larger mixing area through the stirring head 5041, and secondly, the stirring rod 5042 is used to increase the mixing force in the dead corners of the mixing tank.

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

Claims

1. A system for efficiently recovering scheelite and fluorite from polymetallic mud ore, characterized in that: include: A crushing box (200) is provided with a discharge port (201) on the crushing box (200), a crushing tooth roller (202) and a roller grinding roller (204) are provided in the crushing box (200), a plurality of crushing tooth blocks (203) are circumferentially installed on the crushing tooth roller (202), the crushing tooth blocks (203) are used for crushing the raw ore, and the roller grinding roller (204) roll-grinds the crushed raw ore to a particle size of -74 μm accounting for 80% to 95% of the total weight; A magnetic separation tank (300) is provided with an ore feeding port (301), an ore discharging port (302) and a tailings port (303). The ore feeding port (301) is connected to the ore discharging port (201) of the crushing box (200). A weak magnetic group (304) with a magnetic field strength of 4000 Gauss is installed in the magnetic separation tank (300). The weak magnetic group (304) performs magnetic separation on the ore pulp to select magnetite and demagnetized ore. The second magnetic separation tank (400) is provided with a second feed port (401), a second unloading port (402) and a second tailing port (403). The second feed port (401) is connected to the first tailing port (303). A strong magnetic group (404) with a magnetic field strength of 1.0-1.3 Tesla is installed in the second magnetic separation tank (400). The strong magnetic group (404) performs magnetic separation on the demagnetized slurry to select wolframite and demagnetized ore. A mixing tank (500) is provided with an ore inlet (501) and an ore outlet (502), the ore inlet (501) is connected to the tailings outlet (403), and a stirrer (504), an oxalic acid addition pipe (505) and a reagent addition pipe (506) are installed in the mixing tank (500), and the stirrer (504) is used to fully mix the components to obtain the acid-washed ore pulp; A flotation machine (800) is provided. The flotation machine (800) floats the acid-washed slurry to obtain sulfide ore and desulfurized ore. The flotation machine (800) is provided with a flotation inlet (801), a flotation outlet (802) and a flotation tail outlet (803). The flotation inlet (801) is connected to an ore outlet (502). A second mixing tank (600) is provided with a second ore inlet (601) and a second ore outlet (602), the second ore inlet (601) is connected to a first flotation tail outlet (803), and a second stirrer (604), a second oxalic acid addition pipe (605) and a second reagent addition pipe (606) are installed in the second mixing tank (600), and the stirrer (604) is used to fully mix the components to obtain an acid-washed mixed ore pulp; The second flotation machine (900) is equipped with a device for flotating scheelite fluorite mixed ore and tailings. The second flotation machine (900) is provided with a second flotation inlet (901), a second flotation outlet (902) and a second flotation tail outlet (903). The second flotation inlet (901) is connected to the second ore outlet (602). The centrifugal unit (700) is connected to the second flotation outlet (902), and the centrifugal unit (700) is used for re-selecting scheelite concentrate and fluorite concentrate.

2. The system for efficiently recovering scheelite and fluorite from polymetallic mud ore according to claim 1 is characterized in that: Four pressure-bearing shafts (2021) are circumferentially arranged on the outer side of the crushing tooth roller (202), the pressure-bearing shafts (2021) are 3-8 mm thick and have a rectangular cross-section, and an adapting groove (2031) is arranged on the side of the crushing tooth block (203) opposite to the crushing tooth roller (202), and the adapting groove (2031) and the pressure-bearing shaft (2021) are installed in a clearance fit; The tooth-breaking block (203) is divided into a tooth-breaking block 1 (2032) and a tooth-breaking block 2 (2033). Two tooth-breaking blocks 1 (2032) are symmetrically arranged in the upper and lower parts, and two tooth-breaking blocks 2 (2033) are symmetrically arranged in the upper and lower parts. The sides of the tooth-breaking block 1 (2032) and the tooth-breaking block 2 (2033) are in contact with each other. The first crushing tooth block (2032) and the second crushing tooth block (2033) are both radially mounted on the outside of the crushing tooth roller (202).

3. The system for efficiently recovering scheelite and fluorite from polymetallic mud ore according to claim 2 is characterized in that: A sink is provided in the middle of one side of the crushing tooth block (203) opposite to the crushing tooth roller (202), a fixed block (2034) is installed in the sink, a blind hole (2035) is provided on the side of the fixed block (2034) opposite to the crushing tooth block (203), a magnetic moving block (2036) is slidably fitted in the blind hole (2035), a fine hole (2039) is provided at the root of the blind hole (2035), a connecting main rope (2037) is installed in the fine hole (2039), and the connecting main rope (2037) and the magnetic moving block (2036) are connected; The fixing block (2034) is integrally provided with a connector (2038) on the side facing away from the tooth-breaking block (203), and a fine hole (2039) passes through the connector (2038). The side of the connector (2038) is provided with at least two groups of symmetrically distributed vertical holes that are in communication with the fine hole (2039). A connecting auxiliary rope (20310) connected to the connecting main rope (2037) is installed in the vertical hole. The vertical hole is away from the fine hole (2039). One end of the connector is provided with an external expansion hole, in which a limit pin (20311) and a spring (20312) located on the side of the limit pin (20311) close to the fine hole (2039) are slidably fitted, a connecting secondary rope (20310) passes through the spring (20312) and is connected to the limit pin (20311), and an end of the limit pin (20311) away from the spring (20312) is partially exposed on the outside of the connector (2038); The pressure-bearing shaft (2021) is provided with a socket slot (2022) corresponding to the position of the fixed block (2034); the side of the socket slot (2022) is provided with a track groove that slides with the limit pin (20311); the track groove includes a deep groove (2024) located at the end and a shallow groove (2023) located at the notch of the socket slot (2022) and connected to the deep groove (2024).

4. The system for efficiently recovering scheelite and fluorite from polymetallic mud ore according to claim 2 is characterized in that: The side of the first tooth-breaking block (2032) is provided with a vertical dovetail slot (20321), and the side of the second tooth-breaking block (2033) is provided with a vertical dovetail block (20331). The vertical dovetail slot (20321) and the vertical dovetail block (20331) are vertically socket-fitted and installed.

5. The system for efficiently recovering scheelite and fluorite from polymetallic mud ore according to claim 1 or 2, characterized in that: The flotation machine 1 (800) and the flotation machine 2 (900) both include a slurry tank (100); A driver 1 (101) and a driver 2 (102) are installed on the top of the slurry tank (100), and a flow stabilizing plate (104) is provided at the bottom of the slurry 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 system for efficiently recovering scheelite and fluorite from polymetallic mud 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), 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 system for efficiently recovering scheelite and fluorite from polymetallic mud 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 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 system for efficiently recovering scheelite and fluorite from polymetallic mud ore according to claim 1 is characterized in that: The stirrer 1 (504) and stirrer 2 (604) both comprise a stirring head (5041) and a stirring rod (5042) rotatably mounted on the side of the stirring head (5041); a gear plate (5043) is mounted on the top of the stirring head (5041); a sphere (5044) is mounted on the body of the stirring head (5041); an independently arranged fixing hoop (5045) is mounted on the outer side of the sphere (5044); the sphere (5044) is rotatably mounted in the fixing hoop (5045); a gear body (5047) is independently meshed with the outer side of the gear plate (5043); and the gear body (5047) is powered by an independently arranged servo motor (5048).

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