Sedimentation method of low-grade fluorite tailings in ore dressing plant

Abstract

The invention discloses a method for settling low-grade fluorite tailings in a ore dressing plant, and relates to the technical field of low-grade fluorite tailings treatment; pretreatment of tailings and pretreatment of raw ore to reduce the number of particle meshes to less than 120 meshes; adding water to form slurry, and controlling the concentration to be greater than 10%; detecting pH value, and controlling the pH value to be 7.5-8.6; taking 500ml of slurry and placing it in a graduated cylinder with a scale of 500ml; adding hydrochloric acid and flocculant respectively; and providing a test group of natural sedimentation of the tailings slurry with a control; flocculant, including one or more of polyacrylamide, polyaluminium chloride and composite salts; adding flocculants of different densities as an experimental group, and putting the tailings slurry into it for stirring at room temperature, so that the flocculant is fully in contact with the tailings particles; stirring time is 10-30min, using a first fast and then slow method; sedimentation separation; supernatant recovery; sludge treatment. The invention solves the technical problem that the existing single use of polymer flocculants or inorganic flocculants brings about insufficient treatment effect.

Description

Technical Field

[0001] The invention relates to the technical field of low-grade fluorite tailings treatment, in particular to a low-grade fluorite tailings sedimentation method in a ore dressing plant. Background Art

[0002] Low-grade fluorite tailings mainly refer to tailings with relatively low fluorite content produced during the mining and processing of fluorite. Low-grade fluorite tailings are mainly composed of incompletely recovered fluorite, gangue and other impurities. Their chemical composition is complex and usually contains a certain amount of calcium, silicon, aluminum and other elements. Source: During the mining and processing of fluorite, due to the different grades of the ore, the limitations of mineral processing technology and the limitations of equipment conditions, some fluorite cannot be completely recovered, thus forming tailings.

[0003] The experimental sedimentation of low-grade fluorite tailings is mainly to remove suspended matter in the tailings water and reduce the turbidity of the tailings water so that the treated tailings water can be returned to the concentrator for reuse or discharged to meet the standards, thereby reducing pollution to the environment.

[0004] During the sedimentation process, flocculants are usually used to increase the agglomeration particle size of tailings particles, thereby achieving rapid separation of the liquid-solid system. Flocculants are roughly divided into two categories: inorganic flocculants and polymer flocculants. Inorganic flocculants mainly play the role of agglomerating particles by reducing surface potential and other methods. They are relatively cheap, but the dosage is large and the flocculation effect is poor; polymer flocculants generally have a long chain structure and contain more functional groups with strong adsorption capacity on the chain. They can be adsorbed on the surfaces of different particles, thereby producing a bridging effect and forming coarse flocs, but they are expensive.

[0005] To this end, we provide a method for settling low-grade fluorite tailings in a mineral processing plant. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] The method for settling low-grade fluorite tailings in a ore dressing plant is characterized by comprising the following steps:

[0008] Step 1, tailings pretreatment: pre-treating the tailings, crushing and grinding them to reduce the particle size to less than 120 mesh;

[0009] Step 2, ore pretreatment: pre-treat the ore, crush and grind it, and reduce the particle size to less than 120 mesh;

[0010] Step 3, adding water to the tailings to form tailings slurry, and the concentration is controlled to be greater than 10%; detecting the pH value and controlling the pH value to be between 7.5 and 8.6;

[0011] The raw ore is added with water to form raw ore slurry, and the concentration and pH value are the same as those of the tailings slurry;

[0012] Step 4, experimental method: take 500 ml of tailings slurry and place it in a graduated cylinder marked with 500 ml;

[0013] A comparative test was conducted, with group A containing tailings slurry and group B containing raw ore slurry.

[0014] A plurality of parallel measuring cylinders are arranged in group A of tailings slurry, and at least hydrochloric acid and flocculant are added respectively to form and; and a test group of natural sedimentation of tailings slurry with control is arranged;

[0015] The stirring is carried out by circumferential rotation;

[0016] Step 5, the flocculant in step 4 includes one or more of polyacrylamide, polyaluminium chloride and composite salts;

[0017] Add flocculants of different densities as the experimental group, and put them into the tailings slurry for stirring at room temperature to make the flocculants fully contact with the tailings particles; the stirring time is 10-30 minutes, and the method of first fast and then slow is adopted;

[0018] Step 6, sedimentation separation: after stirring and mixing, let the tailings slurry stand for a period of time, the length of time is 5-20 minutes, if no obvious sediment continues to appear, the time can be shortened to no more than 10 minutes; the tailings particles are gradually settled to the bottom under the action of the flocculant;

[0019] Record the separation position, separation time and separation supernatant phenomenon; select the appropriate flocculant component group;

[0020] Step 7, supernatant recovery: recovering and treating the supernatant after sedimentation for use in other production links or as wastewater discharge;

[0021] Step 8, sludge treatment: recover and dry the mineral materials that settle to the bottom.

[0022] In a further technical solution, the composite salt in the flocculant in step 5 includes a molar ratio of calcium salt: magnesium salt: aluminum salt = (1-1.2): (1.1-1.5): (2-2.3);

[0023] Among them, the calcium salt includes calcium oxide or calcium carbonate, the magnesium salt includes magnesium sulfate, and the aluminum salt includes aluminum sulfate or alum.

[0024] In a further technical solution, the flocculant in step 5 uses polyacrylamide:complex salt in a mass ratio of 1.8:1.

[0025] In a further technical solution, a shaker is used in step 4 to achieve synchronous shaking of multiple groups of experiments; the shaker includes a base, a fixed plate is arranged on the base, and two groups of fixed plates are arranged and a rotating shaft is installed between them, one end of the rotating shaft extends out of the fixed plate and is installed with a reduction motor, and the output end of the reduction motor is suitable for driving the rotating shaft to rotate;

[0026] The rotating shaft is provided with a plurality of mounting openings, and the mounting openings are suitable for mounting measuring cylinders.

[0027] In a further technical solution, both sets of fixed plates are equipped with synchronous plates, which are fixedly mounted on the rotating shaft, and a short shaft and a guide wheel are installed on the side opposite to the fixed plate, and the guide material rotates on the short shaft; an annular groove is opened on the fixed plate, and the guide wheel is suitable for moving in the annular groove.

[0028] In a further technical solution, a bottom support plate and a clamping plate are installed between the two sets of synchronous plates, and both ends of the bottom support plate are fixedly connected to the synchronous plates; a mounting port is provided on the bottom support plate, and the mounting port is suitable for mounting the bottom of the measuring cylinder;

[0029] A movable plunger is installed on the clamping plate and is suitable for being clamped in a measuring cylinder; a strong irradiation lamp is installed in the movable plunger, a sinker floats in the measuring cylinder, and the strong irradiation lamp irradiates the sinker toward the bottom.

[0030] In a further technical solution, the sinker includes a light guide cover, a light guide tube and a transverse plate, the light guide cover is fixed on the top of the light guide tube, and a transverse channel is arranged in the transverse plate, and the light guide tube is arranged vertically.

[0031] In a further technical solution, a fixing block and an adjusting block are installed on the clamping plate, a guide bar is installed on the clamping plate, and the adjusting block is installed on the guide bar;

[0032] A rotating screw is installed on the side of the fixed block opposite to the adjusting block, and a connecting bearing is installed on the rotating screw on the fixed block. The inner ring of the connecting bearing is connected to the rotating screw, and the outer ring of the connecting bearing is fixedly connected to the fixed block; a threaded hole is provided on the adjusting block and is threadedly connected to the rotating screw, and a rotating handle is installed on the rotating screw; symmetrical U-shaped openings are provided on both the fixed block and the adjusting block.

[0033] In a further technical solution, an extension cap is installed outside the movable plunger, a plugging head is arranged at the bottom of the extension cap, and the plugging head is suitable for driving and plugging the pouring tip of the measuring cylinder; a connecting belt is installed between the extension cap and the fixed block;

[0034] In step 4, the measuring cylinder is installed from the clamping plate, the rotating shaft to the bottom support plate from top to bottom, and multiple groups of measuring cylinders are placed in the rotating shaft, with the bottom placed on the installation port of the bottom support plate, and the top is inserted into the measuring cylinder through the movable plunger, and the extension cap plays a guiding and sealing role; the rotating screw rotates to realize the movement of the adjusting block relative to the fixed block, so as to clamp the measuring cylinder on the clamping plate; the reduction motor is driven to rotate to realize the rotation and shaking of the measuring cylinder; after shaking, the movable plunger is located at the top to achieve static state, and the cavity irradiation lamp is turned on, and the light is irradiated horizontally out of the sedimentation plate and marked on the horizontal scale on the measuring cylinder.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention can test the sedimentation effect of the material on the slurry of fluorite tailings through a sedimentation method, and experimentally measures that the flocculant of PAM combined with composite salts can effectively remove impurities in the tailings, improve the fineness and dispersibility of the tailings, and is beneficial to subsequent sedimentation treatment and mineral recovery.

[0037] The present invention can achieve batch synchronous sedimentation experiment effects by setting a shaker, and the measuring cylinder can be directly installed on the measuring cylinder by rotating the shaft without installing it on the test container separately; and the bottom support plate and the clamping plate are connected to the measuring cylinder to achieve the limiting effect and synchronous rotation effect. The top of the measuring cylinder is blocked by the piston plunger and the blocking head at the top; the strong irradiation lamp installed in the middle emits ray light on the sinker, and the sinker realizes the horizontal emission of light through refraction and reflection effects, which is convenient for observing the horizontal scale at the separation position in the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 It is a front structural schematic diagram of the shaker of the present invention;

[0040] Figure 2 It is a side schematic diagram of the fixing plate of the present invention;

[0041] Figure 3 It is a front cross-sectional schematic diagram of the shaker of the present invention;

[0042] Figure 4 for Figure 3 A magnified view of part A;

[0043] Figure 5 It is a top view schematic diagram of the clamping plate in the present invention;

[0044] Figure 6 for Figure 5 A magnified view of part B;

[0045] Figure 7 It is a cross-sectional view of the sinker of the present invention. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Example 1

[0048] Combination Figure 1-7 As shown, a technical solution is provided for the invention: a method for settling low-grade fluorite tailings in a ore dressing plant, characterized in that it comprises the following steps:

[0049] Step 1, tailings pretreatment: pre-treating the tailings, crushing and grinding them to reduce the particle size to less than 120 mesh;

[0050] Step 2, ore pretreatment: pre-treat the ore, crush and grind it, and reduce the particle size to less than 120 mesh;

[0051] Step 3, adding water to the tailings to form tailings slurry, and the concentration is controlled to be greater than 10%; detecting the pH value and controlling the pH value to be between 7.5 and 8.6;

[0052] The raw ore is added with water to form raw ore slurry, and the concentration and pH value are the same as those of the tailings slurry;

[0053] Step 4, experimental method: take 500 ml of tailings slurry and place it in a measuring cylinder 6 marked with 500 ml;

[0054] A comparative test was conducted, with group A containing tailings slurry and group B containing raw ore slurry.

[0055] A plurality of parallel measuring cylinders 6 are arranged in group A of tailings slurry, and at least hydrochloric acid and flocculant are added respectively to form and; and a test group of natural sedimentation of tailings slurry with control is arranged;

[0056] The stirring is carried out by circumferential rotation;

[0057] Step 5, the flocculant in step 4 includes one or more of polyacrylamide, polyaluminium chloride and composite salts;

[0058] Add flocculants of different densities as the experimental group, and put them into the tailings slurry for stirring at room temperature to make the flocculants fully contact with the tailings particles; the stirring time is 10-30 minutes, and the method of first fast and then slow is adopted;

[0059] Step 6, sedimentation separation: after stirring and mixing, let the tailings slurry stand for a period of time, the length of time is 5-20 minutes, if no obvious sediment continues to appear, the time can be shortened to no more than 10 minutes; the tailings particles are gradually settled to the bottom under the action of the flocculant;

[0060] Record the separation position, separation time and separation supernatant phenomenon; select the appropriate flocculant component group;

[0061] Step 7, supernatant recovery: recovering and treating the supernatant after sedimentation for use in other production links or as wastewater discharge;

[0062] Step 8, sludge treatment: recover and dry the mineral materials that settle to the bottom.

[0063] In a further technical solution, the composite salt in the flocculant in step 5 includes a molar ratio of calcium salt: magnesium salt: aluminum salt = 1-1.2: 1.1-1.5: 2-2.3;

[0064] Among them, the calcium salt includes calcium oxide or calcium carbonate, the magnesium salt includes magnesium sulfate, and the aluminum salt includes aluminum sulfate or alum.

[0065] In a further technical solution, the flocculant in step 5 uses polyacrylamide:complex salt in a mass ratio of 1.8:1.

[0066] Test sample: low-grade fluorite tailings, measured concentration 10.76%, pH 8.19. φ53m feed ore (raw ore), measured concentration 23.58%.

[0067] This test mainly compares the difference in sedimentation rate of low-concentration fluorite tailings when using natural sedimentation, hydrochloric acid sedimentation, and PAM sedimentation, and also compares the natural sedimentation rate of the same concentration of raw ore. Hydrochloric acid sedimentation exploration test.

[0068] The results are shown in Table 1 for the hydrochloric acid sedimentation classification test table, and Table 2 for the flocculant sedimentation exploration test results.

[0069] Table 1. Results of hydrochloric acid precipitation exploration test

[0070]

[0071]

[0072] Table 2. Results of sedimentation exploration test of low-grade fluorite tailings with PAM + composite salts

[0073]

[0074] Note: When the clear water layer settles to the scale line of 100mL, the corresponding pulp concentration is 42.65%, when it is 125mL, the pulp concentration is 36.14%, and when it is 150mL, the pulp concentration is 31.35%.

[0075] Result analysis:

[0076] 1) Sedimentation rate of low-grade fluorite tailings: The sedimentation rate of PAM+composite salt is the fastest, which is much faster than the sedimentation rate of adding hydrochloric acid. The sedimentation rate of adding hydrochloric acid is slightly faster than the natural sedimentation. At the same time, the clarity of the supernatant water is consistent with the sedimentation rate.

[0077] 2) The sedimentation rate of low-grade fluorite tailings is slower than that of the original ore, which may be caused by the difference in residual mineral processing reagents in the water and the mineral particle size composition.

[0078] Taking into account the cost and effect, it is recommended to use a mixed flocculant of 3-5g / m3 PAM + composite salts for sedimentation.

[0079] 3) In the industrial batch fluorite tailings sedimentation process, the dry ore processing capacity of a single deep cone thickener when adding flocculants is 2000-3000t / d. At present, the dry ore volume of low-grade fluorite tailings is 600-700t / d. If a small amount of flocculants is added, sedimentation can be completely processed. If it settles naturally, a deep cone thickener can also ensure a 35% concentration of the underflow, but the overflow water will always be slightly turbid. Changsha Mining Institute recommends that a thickener with a larger cross-sectional area and shallower depth be used.

[0080] like Figure 1 As shown, in step 4, a shaker is used to achieve synchronous shaking of multiple groups of experiments; the shaker includes a base 1, on which a fixed plate 2 is provided, and the fixed plate 2 is provided with two groups and a rotating shaft 3 is installed between them, one end of the rotating shaft 3 extends out of the fixed plate 2 and is installed with a reduction motor 4, and the output end of the reduction motor 4 is suitable for driving the rotating shaft 3 to rotate; multiple groups of mounting openings 5 ​​are provided on the rotating shaft 3, and the mounting openings 5 ​​are suitable for installing a measuring cylinder 6. Synchronous plates 7 are installed on both groups of fixed plates 2, and the synchronous plates 7 are fixedly installed on the rotating shaft 3, and a short shaft and a guide wheel 8 are installed on the side relative to the fixed plate 2, and the guide material rotates on the short shaft; an annular groove 9 is provided on the fixed plate 2, and the guide wheel 8 is suitable for moving in the annular groove 9. A bottom support plate 10 and a clamping plate 11 are installed between the two groups of synchronous plates 7, and the two ends of the bottom support plate 10 are fixedly connected to the synchronous plate 7; the bottom support plate 10 is provided with a mounting opening 5, and the mounting opening 5 is suitable for installing the bottom of the measuring cylinder 6;

[0081] A movable plunger 12 is installed on the clamping plate 11, and the movable plunger 12 is suitable for being clamped in the measuring cylinder 6; a strong irradiation lamp 13 is installed in the movable plunger 12, and a sedimentation plate floats in the measuring cylinder 6, and the strong irradiation lamp 13 irradiates the sedimentation plate toward the bottom.

[0082] like Figure 7 As shown, the sinker includes a light guide cover 14, a light guide tube 15 and a transverse plate 16. The light guide cover 14 is fixed on the top of the light guide tube 15, and a transverse channel is arranged in the transverse plate 16. The light guide tube 15 is arranged vertically. The sinker is put in when the measuring cylinder is finally blocked, and its outer diameter is matched with the inner wall of the measuring cylinder, and it is then settled at the fixed settlement dividing line.

[0083] like Figure 5 and 6 As shown, a fixing block 17 and an adjusting block 18 are installed on the clamping plate 11, a guide bar 19 is installed on the clamping plate 11, and the adjusting block 18 is installed on the guide bar 19;

[0084] A rotating screw 20 is installed on the side of the fixed block 17 opposite to the adjusting block 18, and a connecting bearing 21 is installed on the fixed block 17. The inner ring of the connecting bearing 21 is connected to the rotating screw 20, and the outer ring of the connecting bearing 21 is fixedly connected to the fixed block 17; a threaded hole is opened on the adjusting block 18 and is threadedly connected to the rotating screw 20, and a rotating handle 22 is installed on the rotating screw 20; symmetrical U-shaped openings 23 are opened on both the fixed block 17 and the adjusting block 18.

[0085] like Figure 4 As shown, an extension cap 24 is installed outside the movable plunger 12, and a plugging head 25 is arranged at the bottom of the extension cap 24, and the plugging head 25 is suitable for driving and plugging the pouring tip of the measuring cylinder 6; a connecting belt 26 is installed between the extension cap 24 and the fixed block 17;

[0086] In step 4, the measuring cylinder 6 is installed from the clamping plate 11, the rotating shaft 3 to the bottom support plate 10 from top to bottom, and multiple groups of measuring cylinders 6 are placed in the rotating shaft 3, with the bottom placed on the installation port 5 of the bottom support plate 10, and the top is inserted into the measuring cylinder 6 through the movable plunger, and the extension cap 24 plays a guiding and sealing role; the rotating screw 20 is rotated to realize the movement of the adjusting block 18 relative to the fixed block 17, so as to clamp the measuring cylinder 6 on the clamping plate 11; the reduction motor 4 is driven to rotate to realize the rotation and shaking of the measuring cylinder 6; after shaking, the movable plunger 12 is located at the top to achieve static state, and the cavity irradiation lamp is turned on, and the light is irradiated laterally out of the sedimentation plate and marked on the horizontal scale on the measuring cylinder 6.

[0087] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0088] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for settling low-grade fluorite tailings in a ore dressing plant, characterized in that: The following steps are involved: Step 1, tailings pretreatment: pre-treating the tailings, crushing and grinding them to reduce the particle size to less than 120 mesh; Step 2, ore pretreatment: pre-treat the ore, crush and grind it, and reduce the particle size to less than 120 mesh; Step 3, adding water to the tailings to form tailings slurry, and the concentration is controlled to be greater than 10%; detecting the pH value and controlling the pH value to be between 7.5 and 8.6; The raw ore is added with water to form raw ore slurry, and the concentration and pH value are the same as those of the tailings slurry; Step 4, taking 500 ml of tailings slurry and placing it in a measuring cylinder (6) marked with 500 ml; A comparative test was conducted, with group A containing tailings slurry and group B containing raw ore slurry. A plurality of parallel measuring cylinders (6) are arranged in group A of tailings slurry, and at least hydrochloric acid and flocculant are added respectively to form and; and a control test group of natural sedimentation of tailings slurry is arranged; The stirring is carried out by circumferential rotation; Step 5, the flocculant in step 4 includes one or more of polyacrylamide, polyaluminium chloride and composite salts; Add flocculants of different densities as the experimental group, and put them into the tailings slurry for stirring at room temperature to make the flocculants fully contact with the tailings particles; the stirring time is 10-30 minutes, and the method of first fast and then slow is adopted; Step 6, sedimentation separation: after stirring and mixing, let the tailings slurry stand for a period of time, the length of time is 5-20 minutes, if no obvious sediment continues to appear, the time can be shortened to no more than 10 minutes; the tailings particles are gradually settled to the bottom under the action of the flocculant; Record the separation position, separation time and separation supernatant phenomenon; select the appropriate flocculant component group; Step 7, supernatant recovery: recovering and treating the supernatant after sedimentation for use in other production links or as wastewater discharge; Step 8, sludge treatment: recover and dry the mineral materials that settle to the bottom.

2. The method for settling low-grade fluorite tailings in a ore dressing plant according to claim 1, characterized in that: In step 5, the composite salts in the flocculant include a molar ratio of calcium salt: magnesium salt: aluminum salt = (1-1.2): (1.1-1.5): (2-2.3); Among them, the calcium salt includes calcium oxide or calcium carbonate, the magnesium salt includes magnesium sulfate, and the aluminum salt includes aluminum sulfate or alum.

3. The method for settling low-grade fluorite tailings in a ore dressing plant according to claim 1, characterized in that: In step 5, the mass ratio of polyacrylamide to composite salt used as flocculant is 1.8:

1.

4. The method for settling low-grade fluorite tailings in a ore dressing plant according to claim 3, characterized in that: In step 4, a shaker is used to achieve synchronous shaking of multiple groups of experiments; the shaker comprises a base (1), a fixed plate (2) is arranged on the base (1), and the fixed plate (2) is provided with two groups and a rotating shaft (3) is installed between them, one end of the rotating shaft (3) extends out of the fixed plate (2) and is installed with a reduction motor (4), and the output end of the reduction motor (4) is suitable for driving the rotating shaft (3) to rotate; The rotating shaft (3) is provided with a plurality of installation openings (5), and the installation openings (5) are suitable for installing a measuring cylinder (6).

5. The method for settling low-grade fluorite tailings in a ore dressing plant according to claim 4, characterized in that: Both sets of fixed plates (2) are provided with a synchronous plate (7), the synchronous plate (7) is fixedly mounted on the rotating shaft (3), and a short shaft and a guide wheel (8) are mounted on the side opposite to the fixed plate (2), the guide material rotates on the short shaft; an annular groove (9) is provided on the fixed plate (2), and the guide wheel (8) is suitable for moving in the annular groove (9).

6. The method for settling low-grade fluorite tailings in a ore dressing plant according to claim 5, characterized in that: A bottom support plate (10) and a clamping plate (11) are installed between the two sets of synchronous plates (7), and both ends of the bottom support plate (10) are fixedly connected to the synchronous plates (7); a mounting opening (5) is provided on the bottom support plate (10), and the mounting opening (5) is suitable for mounting the bottom of the measuring cylinder (6); A movable plunger (12) is installed on the clamping plate (11), and the movable plunger (12) is suitable for being clamped in a measuring cylinder (6); a strong irradiation lamp (13) is installed in the movable plunger (12), and a sinker floats in the measuring cylinder (6), and the strong irradiation lamp (13) irradiates the sinker toward the bottom.

7. The method for settling low-grade fluorite tailings in a ore dressing plant according to claim 5, characterized in that: The sinker comprises a light guide cover (14), a light guide tube (15) and a transverse plate (16); the light guide cover (14) is fixed on the top of the light guide tube (15); a transverse channel is arranged in the transverse plate (16); and the light guide tube (15) is arranged vertically.

8. The method for settling low-grade fluorite tailings in a ore dressing plant according to claim 5, characterized in that: A fixing block (17) and an adjusting block (18) are installed on the clamping plate (11), a guide bar (19) is installed on the clamping plate (11), and the adjusting block (18) is installed on the guide bar (19); A rotating screw (20) is installed on one side of the fixed block (17) opposite to the adjusting block (18); a connecting bearing (21) is installed on the fixed block (17) for the rotating screw (20); the inner ring of the connecting bearing (21) is connected to the rotating screw (20); and the outer ring of the connecting bearing (21) is fixedly connected to the fixed block (17); a threaded hole is provided on the adjusting block (18) and is threadedly connected to the rotating screw (20); a rotating handle (22) is installed on the rotating screw (20); and symmetrical U-shaped openings (23) are provided on both the fixed block (17) and the adjusting block (18).

9. The method for settling low-grade fluorite tailings in a ore dressing plant according to claim 5, characterized in that: An extension cap (24) is installed outside the movable plunger (12), and a plugging head (25) is arranged at the bottom of the extension cap (24), and the plugging head (25) is suitable for driving and plugging the pouring tip of the measuring cylinder (6); a connecting belt (26) is installed between the extension cap (24) and the fixed block (17); In step 4, the measuring cylinder (6) is installed from the clamping plate (11), the rotating shaft (3) to the bottom support plate (10) from top to bottom, and multiple groups of measuring cylinders (6) are placed in the rotating shaft (3), with the bottom placed on the installation port (5) of the bottom support plate (10), and the top is inserted into the measuring cylinder (6) through the piston, and the extension cap (24) plays a guiding and sealing role; the rotating screw (20) is rotated to realize the movement of the adjustment block (18) relative to the fixed block (17), so as to clamp the measuring cylinder (6) on the clamping plate (11); the reduction motor (4) is driven to rotate to realize the rotation and shaking of the measuring cylinder (6); after shaking until the movable plunger (12) is located at the top to achieve static, the cavity irradiation lamp is turned on, and the light is irradiated horizontally out of the sedimentation plate and marked on the horizontal scale on the measuring cylinder (6).

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