Synergistic recovery device and method for pulverized coal, pyrite and tailings in high-sulfur coal gangue

Abstract

The invention discloses a collaborative recovery device and method for pulverized coal, pyrite and tailings in high-sulfur coal gangue, and belongs to the technical field of solid waste resource utilization. The device comprises a flotation box body, a coal gangue slurry input mechanism, an aeration mechanism, a pulverized coal collecting hopper, a tailing collecting hopper and a pyrite collecting hopper, and a slurry output port of the coal gangue slurry input mechanism penetrates through the left side wall of the flotation box body and horizontally extends into the flotation box body; the aeration mechanism penetrates through the left side wall of the flotation box body and extends into the flotation box body, the pulverized coal collecting hopper is fixedly installed on the upper portion of the right side wall of the flotation box body, a pulverized coal discharging port communicated with the pulverized coal collecting hopper and the interior of the flotation box body is formed in the right side wall of the flotation box body, and the bottom edge of the pulverized coal discharging port is higher than the bottom face of the pulverized coal collecting hopper. According to the invention, the device and the method are matched, so that the pulverized coal, the pyrite and the tailings in the high-sulfur coal gangue are effectively and efficiently separated, the resource utilization rate of the high-sulfur coal gangue is enhanced, and the resource waste is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid waste resource utilization, and relates to a device and method for collaboratively recovering coal powder, pyrite and tailings from high-sulfur coal gangue. Background Art

[0002] Gangue, the primary solid waste generated during coal mining and washing, is crucial for resource utilization in mining environmental protection. The primary methods for treating gangue include stockpiling and landfilling. However, according to statistics, my country's gangue stockpiles exceed 7 billion tons, occupying significant space and facing long-standing challenges of low utilization and significant environmental pollution risks. High-sulfur gangue (sulfur content ≥3%) accounts for approximately 15% of all gangue stockpiles. Its high sulfur content and complex composition contribute to sulfur waste and environmental pollution. Furthermore, research has shown that when the sulfur content of gangue exceeds 3%, it is prone to spontaneous combustion, making stockpiling or landfilling highly hazardous. Furthermore, when high-sulfur gangue is directly used in building materials production, the calcination process releases SO2, causing environmental pollution.

[0003] High-sulfur coal gangue usually contains coal powder, pyrite and tailings. Among them, coal powder belongs to coal resources, and pyrite (also known as pyrite, pyrrhotite, and marcasite) is an important sulfur-containing iron mineral that can be used to manufacture sulfuric acid and as a chemical mineral raw material. Combined with the above-mentioned high-sulfur coal gangue storage or landfill will have many negative effects. Therefore, it is of great significance to separate the high-sulfur coal gangue and recover the valuable resources therein.

[0004] At present, coal powder in coal gangue is usually enriched by flotation or gravity separation process. However, in the process of enriching coal powder in coal gangue by flotation or gravity separation process, on the one hand, due to the poor effectiveness of flotation agents such as collectors, the separation and enrichment effect of coal powder is poor, and the coal powder recovery rate is low. After sorting, there is still a large amount of coal powder in the remaining materials, resulting in coal powder waste, and it is difficult to achieve full dissociation and selective enrichment of pyrite, resulting in the pyrite grade after sorting generally being lower than 40%; on the other hand, after the separation and recovery of coal powder in coal gangue, the remaining materials are usually directly utilized without directional sorting. First, the remaining materials contain more pyrite and coal powder, and secondly, the remaining materials also contain more silicate. Direct utilization results in poor refinement of resource utilization, which easily leads to waste of coal powder, pyrite, silicon and aluminum resources.

[0005] Therefore, it is necessary to provide a device and method for the coordinated recovery of coal powder, pyrite and tailings in high-sulfur coal gangue, which can directly separate and recover coal powder, pyrite and tailings in high-sulfur coal gangue in one operation, and make more refined and targeted resource utilization of the three resources. Summary of the Invention

[0006] In order to overcome the problems in background technology, the present invention is by using the mixture of fatty acid methyl ester and sodium petroleum sulfonate as collecting agent, utilizing the characteristic that fatty acid methyl ester can be selectively adsorbed on the hydrophobic surface of coal dust, strengthen coal dust and bubble binding ability, thus improve the probability that coal dust is adsorbed by micro-bubble, more bubbles are produced by aeration mode, while fine-grained coal dust is assisted by sodium petroleum sulfonate, improve the adsorption efficiency of fatty acid methyl ester at coal dust-gangue interface, be 8~9 effectively suppress tailings to float by regulating flotation reagent pH, and then promote coal dust selective separation, improve coal dust recovery rate.By utilizing the larger density difference of pyrite and other tailings components, pyrite and other tailings components are sunk in corresponding collecting hopper along different parabolic tracks, thus realize the separation and recovery of pyrite and other tailings components.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions: On the one hand, the present invention proposes a coordinated recovery device for coal powder, pyrite and tailings in high-sulfur coal gangue, the device comprising a flotation box 1, a coal gangue slurry input mechanism 2, an aeration mechanism 3, a coal powder collection hopper 4, a tailings collection hopper 5, and a pyrite collection hopper 6. The flotation box 1 is a rectangular parallelepiped structure. The slurry output port of the coal gangue slurry input mechanism 2 extends horizontally through the left side wall of the flotation box 1 to the interior of the flotation box 1 to input the coal gangue slurry into the flotation box 1. The aeration mechanism 3 passes through the left side wall of the flotation box 1 and extends into the interior of the flotation box 1. The coal powder collection hopper 4 is fixedly installed on the upper right side wall of the flotation box 1. A coal powder discharge port 7 connecting the coal powder collection hopper 4 and the interior of the flotation box 1 is provided on the right side wall of the flotation box 1. The coal powder discharge port 7 is sealed by a sealing plug 8, and the bottom edge of the coal powder discharge port 7 is higher than the bottom surface of the coal powder collection hopper 4.

[0008] The tailings collecting bucket 5 and the pyrite collecting bucket 6 are fixedly arranged on the bottom surface of the flotation box 1. The tailings collecting bucket 5 and the pyrite collecting bucket 6 are both chamfered truncated structures. The side lengths of the top surfaces of the tailings collecting bucket 5 and the pyrite collecting bucket 6 from left to right are 1 / 2 of the side lengths of the flotation box 1 in the same direction. There is a gap between the front and rear sides of the top surfaces of the tailings collecting bucket 5 and the pyrite collecting bucket 6 and the front and rear sides of the flotation box 1. The heights of the tailings collecting bucket 5 and the pyrite collecting bucket 6 are both 80- 90cm, the aeration mechanism 3 is located above the pyrite collecting hopper 6 and the distance between the aeration mechanism 3 and the top surface of the pyrite collecting hopper 6 is 40-45cm, the slurry output port of the gangue slurry input mechanism 2 is located above the pyrite collecting hopper 6 and the distance between the slurry output port of the gangue slurry input mechanism 2 and the top surface of the pyrite collecting hopper 6 is 50-55cm, and the distance between the slurry output port of the gangue slurry input mechanism 2 and the left side wall of the flotation box 1 is 10-15cm.

[0009] Preferably, the gangue slurry input mechanism 2 includes a gangue slurry preparation and storage tank 201, a horizontal centrifugal slurry pump 202, and a feed pipe 203. The gangue slurry preparation and storage tank 201 is connected to the feed port of the horizontal centrifugal slurry pump 202 through a pipeline, and the discharge port of the horizontal centrifugal slurry pump 202 is connected to one end of the feed pipe 203. The other end of the feed pipe 203 extends horizontally through the left side wall of the flotation box 1 to the inside of the flotation box 1. The end of the feed pipe 203 located inside the flotation box 1 is 10~15 cm away from the left side wall of the flotation box 1, and the horizontal extension section of the feed pipe 203 is 50~55 cm away from the top surface of the pyrite collection bucket 6.

[0010] Preferably, one end of the feed pipe 203 located in the flotation box 1 is in an outwardly expanding bell-mouth structure, and the acute angle formed by the side wall of the outwardly expanding bell-mouth structure and the side wall of the horizontal section of the feed pipe 203 is 30°.

[0011] Preferably, the aeration mechanism 3 includes a blower 301, an air pipe 302, and a polyurethane microporous aeration plate 303. The air outlet of the blower 301 is connected to one end of the air pipe 302, and the other end of the air pipe 302 passes through the left side wall of the flotation box 1 and is connected to the polyurethane microporous aeration plate 303. The left side wall of the polyurethane microporous aeration plate 303 is in contact with the left side wall of the flotation box 1, and the polyurethane microporous aeration plate 303 is horizontally arranged. The thickness of the polyurethane microporous aeration plate 303 is ≥15 mm, the distance between the bottom surface of the polyurethane microporous aeration plate 303 and the top surface of the pyrite collection bucket 6 is 40~45 cm, and the diameter of the polyurethane microporous aeration plate 303 is 30~40 cm.

[0012] Preferably, the aeration mechanism 3 also includes a horizontal connecting rod 304 and a rectangular baffle 305, one end of the horizontal connecting rod 304 is fixedly connected to the right side wall of the polyurethane microporous aeration disk 303, and the other end of the horizontal connecting rod 304 is fixedly connected to the bottom of the rectangular baffle 305, the rectangular baffle 305 is inclined to the upper right, the obtuse angle formed by the rectangular baffle 305 and the horizontal plane is 105°, the length of the inclined side of the rectangular baffle 305 is 30~35cm, the length of the horizontal side of the rectangular baffle 305 is the same as the diameter of the polyurethane microporous aeration disk 303, the thickness of the rectangular baffle 305 is 1.5~2cm, and the length of the horizontal connecting rod 304 is 10cm.

[0013] Preferably, a rectangular vertical baffle 9 is provided at the top contact position of the tailings collecting bucket 5 and the pyrite collecting bucket 6. The rectangular vertical baffle 9 is 25 cm high and 2 to 3 cm thick. The length of the top edge of the rectangular vertical baffle 9 is the same as the distance between the front and rear sides of the top of the tailings collecting bucket 5.

[0014] Preferably, a drain port 10, a tailings outlet 11, and a pyrite outlet 12 are provided on the bottom surface of the flotation box 1. The drain port 10 is located outside the encirclement of the tailings collecting bucket 5 and the pyrite collecting bucket 6, the tailings outlet 11 is located within the encirclement of the tailings collecting bucket 5, and the pyrite outlet 12 is located within the encirclement of the pyrite collecting bucket 6. The drain port 10, the tailings outlet 11, and the pyrite outlet 12 are all sealed by a sealing plug 8.

[0015] Another aspect of the present invention provides a method for collaboratively recovering coal powder, pyrite, and tailings from high-sulfur coal gangue using the above-mentioned device. The recovery method comprises the following steps: S1: Fatty acid methyl ester and sodium petroleum sulfonate are mixed in a mass ratio of fatty acid methyl ester: sodium petroleum sulfonate = 1:0.05-0.1 to obtain a collector, and then methyl isobutyl carbinol (1 / 3 of the mass of the collector) is added to the collector as a foaming agent. Finally, lime is added to adjust the liquid pH to 8.0-9.0 to obtain a flotation agent. The flotation agent is added to the flotation box 1 so that the flotation agent liquid level is higher than the top edge of the coal powder discharge port 7, and the amount of collector used is recorded; S2: Grind the high-sulfur coal gangue to a particle size of 150-100 mesh, add the ground high-sulfur coal gangue to water, and prepare a coal gangue slurry, wherein the solid-liquid ratio of the high-sulfur coal gangue to water is high-sulfur coal gangue: water = 1 kg: 3 L; S3: According to the ratio of 1 kg collector to 1 t high sulfur gangue, according to the amount of collector added to the flotation box 1, take the corresponding mass of gangue slurry and add it to the gangue slurry input mechanism 2. Set the speed of the gangue slurry input mechanism 2 to 1.5 m / s, and set the aeration intensity of the aeration mechanism 3 to 1.2 cm / s. Then open the gangue slurry input mechanism 2 and input the gangue slurry into the flotation box. In step 1, 0.5 to 1 second after the gangue slurry input mechanism 2 is turned on, the aeration mechanism 3 is turned on. After the gangue slurry contacts the flotation agent, the coal powder in the gangue is separated and floats to the liquid surface. The remaining material sinks along a parabolic trajectory. During the sinking process of the remaining material, pyrite is separated from the remaining material and sinks along a parabolic trajectory into the pyrite collection hopper 6. The tailings also sink along a parabolic trajectory into the tailings collection hopper 5. S4: When all the gangue slurry in the gangue slurry input mechanism 2 is transported to the flotation box 1 and there is no more solid movement in the flotation box 1, it is determined that the separation of coal powder, pyrite and tailings in the gangue is completed. First, remove the sealing plug 8 at the coal powder discharge port 7, and the coal powder floating on the liquid surface is discharged to the coal powder collection bucket 4 through the coal powder discharge port 7 along with the liquid. When the liquid level in the flotation box 1 drops below the coal powder discharge port 7, remove the sealing plug 8 of the drain port 10, and the liquid in the flotation box 1 is discharged from the drain port 10. After the liquid in the flotation box 1 is discharged, remove the sealing plugs 8 of the tailings outlet 11 and the pyrite outlet 12, and collect the materials discharged from the tailings outlet 11 and the pyrite outlet 12 respectively.

[0016] Beneficial effects of the present invention: 1. The present invention uses a mixture of fatty acid methyl ester and sodium petroleum sulfonate as a collector, and combines it with aeration to increase the floating amount and buoyancy of coal powder in coal gangue. At the same time, by adjusting the pH, the tailings containing pyrite in the coal gangue are suppressed, thereby improving the separation effect of coal powder and tailings and increasing the coal powder recovery rate.

[0017] 2. The present invention utilizes the density difference between pyrite and other tailings in the tailings. By rationally designing the device and combining the device's operating parameters, the pyrite and other tailings are made to move along different parabolic trajectories in the liquid and are directly separated and fall into corresponding collection buckets, thereby improving the device's ease of use and simplifying the device structure.

[0018] 3. The present invention provides a plate-shaped electromagnet and utilizes the weak magnetic property of pyrite to further enhance the separation effect of pyrite and other tailings, thereby improving the pyrite separation recovery rate.

[0019] 4. By using the device of the present invention in combination with the specific method of use, coal powder, pyrite and other tailings can be separated and recovered in a single operation, thereby making the coal powder, pyrite and tailings in the coal gangue resource-utilized, which is beneficial to reducing the stockpile of high-sulfur coal gangue and reducing the negative impact of the stockpile of high-sulfur coal gangue. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view schematic diagram of the overall structure of the device of the present invention; Figure 2 Schematic diagram of the outward-expanding bell mouth structure of the feed pipe of the present invention; Figure 3 This is a schematic top view of the structure of the polyurethane aeration disk connected to the rectangular baffle of the present invention.

[0021] Figure 4 It is a left side schematic diagram of the overall structure of the device of the present invention.

[0022] Among them, 1-flotation box, 2-gangue slurry input mechanism, 201-gangue slurry preparation and storage tank, 202-horizontal centrifugal slurry pump, 203-feed pipe, 3-aeration mechanism, 301-blower, 302-air transmission pipe, 303-polyurethane microporous aeration disk, 304-horizontal connecting rod, 305-rectangular baffle, 4, coal powder collection hopper, 5-tailings collection hopper, 6-pyrite collection hopper, 7-coal powder discharge port, 8-sealing plug, 9-rectangular vertical baffle, 10-drainage port, 11-tailings outlet, 12-pyrite outlet. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited to the contents described above.

[0024] like Figure 1-3 As shown, the device includes a flotation box 1, a gangue slurry input mechanism 2, an aeration mechanism 3, a coal powder collecting hopper 4, a tailings collecting hopper 5, and a pyrite collecting hopper 6. The flotation box 1 is a rectangular structure. The slurry output port of the gangue slurry input mechanism 2 extends horizontally through the left side wall of the flotation box 1 to the inside of the flotation box 1 to input the gangue slurry into the flotation box 1. The aeration mechanism 3 passes through the left side wall of the flotation box 1 and extends to the inside of the flotation box 1. The coal powder collecting hopper 4 is fixedly installed on the upper right side wall of the flotation box 1. A coal powder discharge port 7 connecting the coal powder collecting hopper 4 and the inside of the flotation box 1 is opened on the right side wall of the flotation box 1. The coal powder discharge port 7 is sealed by a sealing plug 8. The bottom edge of the coal powder discharge port 7 is higher than the bottom surface of the coal powder collecting hopper 4.

[0025] The tailings collecting bucket 5 and the pyrite collecting bucket 6 are fixedly arranged on the bottom surface of the flotation box 1. The tailings collecting bucket 5 and the pyrite collecting bucket 6 are both chamfered truncated structures. The side lengths of the top surfaces of the tailings collecting bucket 5 and the pyrite collecting bucket 6 from left to right are 1 / 2 of the side lengths of the flotation box 1 in the same direction. A gap is set between the front and rear sides of the top surfaces of the tailings collecting bucket 5 and the pyrite collecting bucket 6 and the front and rear sides of the flotation box 1 (the gap distance can be 5-10 cm, to ensure that the flotation reagent can flow to the bottom of the flotation box through the gap). The heights of the collecting hopper 5 and the pyrite collecting hopper 6 are both 80-90 cm. The aeration mechanism 3 is located above the pyrite collecting hopper 6 and the distance between the aeration mechanism 3 and the top surface of the pyrite collecting hopper 6 is 40-45 cm. The slurry output port of the gangue slurry input mechanism 2 is located above the pyrite collecting hopper 6 and the distance between the slurry output port of the gangue slurry input mechanism 2 and the top surface of the pyrite collecting hopper 6 is 50-55 cm. The distance between the slurry output port of the gangue slurry input mechanism 2 and the left side wall of the flotation box 1 is 10-15 cm.

[0026] When the device of the present invention is used to carry out the coordinated recovery of coal powder, pyrite and tailings in high-sulfur coal gangue, the prepared flotation reagent is first added to the flotation box 1 (a flotation reagent addition port is provided on the top surface of the flotation box 1, and the flotation reagent addition port is sealed by conventional covering technology, conventional technology, not shown in the figure), and then the prepared coal gangue slurry is added to the coal gangue slurry input mechanism 2. After the flotation reagent and coal gangue slurry are added, the coal gangue slurry input mechanism 2 is first opened, and the coal gangue slurry input mechanism 2 transports the coal gangue slurry into the flotation box 1, and the coal gangue slurry enters the flotation reagent. Under the action of the flotation agent, the coal powder is separated from the gangue and floats up. After the gangue slurry input mechanism 2 is turned on for 0.5 to 1 second, the aeration mechanism 3 is turned on. Then, under the joint action of the flotation agent and the aeration mechanism 3, the coal powder has a stronger floating strength, and more coal powder can be separated from the gangue and floated to the surface of the flotation agent liquid. When the gangue slurry is transported to the flotation box 1 by the gangue slurry input mechanism 2, it has an initial velocity in the horizontal direction. At the same time, the remaining materials after the separation of the gangue and coal powder are also affected by gravity. As a result, the remaining materials will move along a parabolic trajectory. Among the remaining materials, pyrite (density is about 4.5 to 5.2 g / cm 3 ) and other materials (tailings, density of about 2.4~3.2g / cm 3 ) have different densities. Therefore, after pyrite and tailings enter the same medium with the same initial velocity, their parabolic trajectories are different. By designing the dimensions of components such as the pyrite collecting hopper 6 and the tailings collecting hopper 5, and designing the position distance relationship between matching components, and combining the working parameters of the components, the parabolic trajectory of the pyrite can be made to enter the pyrite collecting hopper 6, while the parabolic trajectory of the tailings can be made to enter the tailings collecting hopper 5, thereby separating the coal powder, pyrite and tailings in the high-sulfur coal gangue.

[0027] When the separation process is completed, the coal powder will still float on the surface of the flotation agent liquid. The sealing plug 8 at the coal powder discharge port 7 is removed, and the flotation agent will flow out from the coal powder discharge port 7 to the coal powder collecting hopper 4. The coal powder floating on the surface of the flotation agent liquid will also flow out through the coal powder discharge port 7 to the coal powder collecting hopper 4 along with the flotation agent. The mixture of coal powder and liquid in the coal powder collecting hopper 4 is then uniformly collected and solid-liquid separated (filtered or dried) to obtain coal powder.

[0028] The gangue slurry input mechanism 2 includes a gangue slurry preparation and storage tank 201, a horizontal centrifugal slurry pump 202, and a feed pipe 203. The gangue slurry preparation and storage tank 201 is connected to the feed port of the horizontal centrifugal slurry pump 202 through a pipeline, and the discharge port of the horizontal centrifugal slurry pump 202 is connected to one end of the feed pipe 203. The other end of the feed pipe 203 extends horizontally through the left side wall of the flotation box 1 to the inside of the flotation box 1. The end of the feed pipe 203 located inside the flotation box 1 is 10~15 cm away from the left side wall of the flotation box 1, and the horizontal extension section of the feed pipe 203 is 50~55 cm away from the top surface of the pyrite collection bucket 6.

[0029] The prepared gangue slurry is added to the gangue slurry preparation and storage tank 201. After the horizontal centrifugal slurry pump 202 is turned on, the horizontal centrifugal slurry pump 202 can extract the gangue slurry from the gangue slurry preparation and storage tank 201, and then pump it into the flotation box 1 through the feed pipe 203. By adjusting the working parameters of the horizontal centrifugal slurry pump 202, the speed of pumping the gangue slurry can be controlled, thereby controlling the initial velocity of the gangue slurry output from the end of the feed pipe 203.

[0030] One end of the feed pipe 203 located in the flotation box 1 is in an outward-expanding bell-mouth structure, and the acute angle formed by the side wall of the outward-expanding bell-mouth structure and the side wall of the horizontal section of the feed pipe 203 is 30°.

[0031] Since the coal gangue slurry enters the flotation box 1 and contacts the flotation reagent, the coal powder will float up. The above structure can further reduce the blocking effect of the feed pipe 203 on the floating of the coal powder, allowing the coal powder to float up smoothly along the upward inclined pipe wall.

[0032] The aeration mechanism 3 includes a blower 301, an air pipe 302, and a polyurethane microporous aeration plate 303. The air outlet of the blower 301 is connected to one end of the air pipe 302. The other end of the air pipe 302 passes through the left side wall of the flotation box 1 and is connected to the polyurethane microporous aeration plate 303. The left side wall of the polyurethane microporous aeration plate 303 is in contact with the left side wall of the flotation box 1, and the polyurethane microporous aeration plate 303 is arranged horizontally. The thickness of the polyurethane microporous aeration plate 303 is ≥15 mm, the distance between the bottom surface of the polyurethane microporous aeration plate 303 and the top surface of the pyrite collection hopper 6 is 40-45 cm, and the diameter of the polyurethane microporous aeration plate 303 is 30-40 cm.

[0033] When the blower 301 is turned on, the blower 301 delivers gas to the polyurethane microporous aeration plate 303 through the air supply pipe 302, thereby starting aeration of the polyurethane microporous aeration plate 303. By selecting the polyurethane microporous aeration plate 303 of the aforementioned size and combining it with the position setting of the microporous aeration plate, the impact of aeration on the parabolic trajectory of the remaining material can be effectively reduced. In addition, by setting the working parameters of the blower 301, the aeration intensity of the polyurethane microporous aeration plate 303 can be adjusted, and the working parameters of the polyurethane microporous aeration plate 303 can be further controlled to be within a reasonable working range.

[0034] The aeration mechanism 3 also includes a horizontal connecting rod 304 and a rectangular baffle 305. One end of the horizontal connecting rod 304 is fixedly connected to the right side wall of the polyurethane microporous aeration disk 303, and the other end of the horizontal connecting rod 304 is fixedly connected to the bottom of the rectangular baffle 305. The rectangular baffle 305 is inclined to the upper right, and the obtuse angle formed by the rectangular baffle 305 and the horizontal plane is 105°. The length of the inclined side of the rectangular baffle 305 is 30~35cm, the length of the horizontal side of the rectangular baffle 305 is the same as the diameter of the polyurethane microporous aeration disk 303, the thickness of the rectangular baffle 305 is 1.5~2cm, and the length of the horizontal connecting rod 304 is 10cm.

[0035] When the gangue slurry is ejected through the feed pipe 203, it has a certain horizontal initial velocity. The coal powder floats under the combined action of the flotation agent and the polyurethane aeration plate 303. By using the components of the aforementioned structure and size and combining the control of the aeration intensity and the initial velocity of the gangue slurry conveying, the remaining materials can be made to float first when subjected to the aeration effect, bypass the rectangular baffle 305, and then fall. When the aeration intensity and the initial velocity of the gangue slurry conveying are the same, since the density of pyrite is larger, its floating degree is smaller, while the density of tailings is smaller, its floating degree is larger. Therefore, the tailings are more likely to bypass the rectangular baffle 305 from the top of the rectangular baffle 305. Since the density of pyrite is larger, it is more likely to be blocked by the rectangular baffle 305 and fall directly into the pyrite collection bucket 6, thereby effectively enhancing the separation effect of pyrite and tailings (such as Figure 1 shown).

[0036] A rectangular vertical baffle 9 is set at the top contact position of the tailings collecting bucket 5 and the pyrite collecting bucket 6. The rectangular vertical baffle 9 is 25 cm high and 2 to 3 cm thick. The length of the top edge of the rectangular vertical baffle 9 is the same as the distance between the front and rear sides of the top of the tailings collecting bucket 5.

[0037] By setting a rectangular vertical baffle between the tailings collection hopper and the pyrite collection hopper, the separation effect of pyrite and tailings can be further enhanced, and the recovery rate of pyrite and tailings can be improved.

[0038] A drain port 10, a tailings outlet 11, and a pyrite outlet 12 are provided on the bottom surface of the flotation box 1. The drain port 10 is located outside the encirclement of the tailings collecting bucket 5 and the pyrite collecting bucket 6. The tailings outlet 11 is located within the encirclement of the tailings collecting bucket 5. The pyrite outlet 12 is located within the encirclement of the pyrite collecting bucket 6. The drain port 10, the tailings outlet 11, and the pyrite outlet 12 are all sealed by a sealing plug 8.

[0039] After separation is completed, the pyrite enters the pyrite collection bucket 6, and the tailings enter the tailings collection bucket 5. At the same time, there is still a lot of liquid inside the flotation box 1. First, remove the sealing plug 8 of the drain port 10, and the liquid in the flotation box 1 will be discharged from the drain port 10. At this time, as the liquid is discharged, the liquid level in the flotation box 1 will drop. Since the liquid is discharged from the drain port 10 on the bottom surface of the flotation box 1, the liquid discharge will not affect the tailings and pyrite in the tailings collection bucket 5 and the pyrite collection bucket 6. The drain port 10 can The liquid inside the flotation box 1 except the tailings collecting hopper 5 and the pyrite collecting hopper 6 is drained, and then the sealing plugs 8 of the tailings outlet 11 and the pyrite outlet 12 are removed. Then, the residual liquid and tailings in the tailings collecting hopper 5 are discharged through the tailings outlet 11, and the residual liquid and pyrite in the pyrite collecting hopper 6 are discharged from the pyrite outlet 12. The mixture of tailings and liquid and the mixture of pyrite and liquid are collected separately and uniformly, and then the tailings and liquid can be separated, and the pyrite and liquid can be separated by simple filtration or drying.

[0040] In the examples and comparative examples of the present invention, the high-sulfur coal gangue was selected from a high-sulfur coal gangue mine in Yunnan Province, and the sulfur content in the high-sulfur coal gangue was 4.2%.

[0041] Example 1 This embodiment uses a device to separate and recover high-sulfur coal gangue according to the following method: (1) Fatty acid methyl ester and sodium petroleum sulfonate were mixed in a mass ratio of fatty acid methyl ester to sodium petroleum sulfonate = 1:0.08 to obtain a collector. Methyl isobutyl carbinol (1 / 3 of the mass of the collector) was added to the collector as a foaming agent. Finally, lime was added to adjust the pH of the liquid to 8.0-9.0 to obtain a flotation agent. The flotation agent was added to the flotation box 1 until the flotation agent liquid level was higher than the top edge of the coal powder discharge port 7, and the amount of collector used was recorded.

[0042] (2) Grind the high-sulfur coal gangue to a particle size of 150-100 mesh, add the ground high-sulfur coal gangue into water, and prepare a coal gangue slurry, wherein the solid-liquid ratio of high-sulfur coal gangue to water is high-sulfur coal gangue: water = 1kg:3L.

[0043] (3) According to the ratio of 1 kg of collector to 1 t of high sulfur gangue, the corresponding mass of gangue slurry is added to the gangue slurry preparation storage tank 201 according to the amount of collector added to the flotation box 1, and the horizontal centrifugal slurry pump 202 is set to pump the slurry at a speed of 1.5 m / s. At the same time, the parameters of the blower 301 are set so that the aeration intensity of the polyurethane microporous aeration disk 303 is 1.2 cm / s, and then the horizontal centrifugal slurry pump 202 is turned on. Centrifugal pump 202 draws gangue slurry from gangue preparation and storage tank 201 and pumps it into flotation tank 1 via feed pipe 203. 0.8 seconds after horizontal centrifugal pump 202 is turned on, blower 301 is turned on and delivers gas to polyurethane microporous aeration disk 303 via air pipe 302, causing the polyurethane microporous aeration disk 303 to begin operation. After the gangue slurry comes into contact with the flotation reagent, the coal fines in the gangue are separated and float to the liquid surface, while the remaining material sinks along a parabolic trajectory. During this sinking process, pyrite is separated from the remaining material and sinks along a parabolic trajectory into pyrite collection hopper 6, while tailings also sink along a parabolic trajectory into tailings collection hopper 5.

[0044] When the gangue slurry is input into the flotation box 1 through the gangue slurry input mechanism 2, since the flotation agent has been added to the flotation box 1, as the gangue slurry is input, the volume of the material in the flotation box 1 will increase and the liquid level will rise. Therefore, by increasing the overall height of the flotation box 1 and increasing the distance between the coal powder discharge port 7 and the top surface of the flotation box 1, after the flotation agent level is higher than the coal powder discharge port 7, there is still space above the flotation agent level to accommodate the input gangue slurry.

[0045] (4) When all the gangue slurry in the gangue slurry input mechanism 2 is transported to the flotation box 1 and there is no more solid movement in the flotation box 1, it is determined that the separation of coal powder, pyrite and tailings in the gangue is completed. First, the sealing plug 8 at the coal powder discharge port 7 is removed, and the coal powder floating on the liquid surface is discharged with the liquid through the coal powder discharge port 7 to the coal powder collection hopper 4. Then, the mixture of coal powder and liquid is filtered, dried and other solid-liquid separation operations are performed to obtain coal powder. When the flotation box is closed, the coal powder is discharged. When the liquid level in the flotation tank 1 drops below the coal powder discharge port 7, the sealing plug 8 of the liquid discharge port 10 is removed, and the liquid in the flotation tank 1 is discharged from the liquid discharge port 10. After the liquid in the flotation tank 1 is discharged, the sealing plugs 8 of the tailings outlet 11 and the pyrite outlet 12 are removed, and the materials discharged from the tailings outlet 11 and the pyrite outlet 12 are collected respectively. Thereafter, conventional solid-liquid separation operations are performed on the mixture of tailings and liquid, and the mixture of pyrite and liquid, to obtain tailings and pyrite.

[0046] In this embodiment, the polyurethane microporous aeration disc 303 has a diameter of 35 cm and a thickness of 15 mm, and is 43 cm away from the top surface of the pyrite collection hopper 6; the inclined side length of the rectangular baffle 305 is 32 cm and the thickness is 1.7 cm; the rectangular vertical baffle 9 is 2.5 cm thick; the distance between the end of the feed pipe 203 outputting the slurry and the left side wall of the flotation box 1 is 12 cm, and the distance between the horizontal extension section of the feed pipe 203 and the top surface of the pyrite collection hopper 6 is 52 cm.

[0047] After the coordinated recovery of coal powder, pyrite and tailings from high-sulfur coal gangue in this embodiment is completed, the recovery rates of coal powder and pyrite are calculated respectively, and the SiO2 content in the tailings is measured. The results are shown in Table 1.

[0048] Example 2 This embodiment uses a device to separate and recover high-sulfur coal gangue according to the following method: (1) Fatty acid methyl ester and sodium petroleum sulfonate were mixed in a mass ratio of fatty acid methyl ester to sodium petroleum sulfonate = 1:0.05 to obtain a collector. Methyl isobutyl carbinol (1 / 3 of the mass of the collector) was then added to the collector as a foaming agent. Finally, lime was added to adjust the pH of the liquid to 8.0-9.0 to obtain a flotation agent. The flotation agent was added to the flotation box 1 until the flotation agent liquid level was higher than the top edge of the coal powder discharge port 7, and the amount of collector used was recorded.

[0049] (2) Grind the high-sulfur coal gangue to a particle size of 150-100 mesh, add the ground high-sulfur coal gangue into water, and prepare a coal gangue slurry, wherein the solid-liquid ratio of high-sulfur coal gangue to water is high-sulfur coal gangue: water = 1kg:3L.

[0050] (3) According to the ratio of 1 kg of collector to 1 t of high sulfur gangue, the corresponding mass of gangue slurry is added to the gangue slurry preparation storage tank 201 according to the amount of collector added to the flotation box 1, and the horizontal centrifugal slurry pump 202 is set to pump the slurry at a speed of 1.5 m / s. At the same time, the parameters of the blower 301 are set so that the aeration intensity of the polyurethane microporous aeration disk 303 is 1.2 cm / s, and then the horizontal centrifugal slurry pump 202 is turned on. The horizontal centrifugal slurry pump 202 extracts gangue slurry from the gangue slurry preparation and storage tank 201 and pumps the gangue slurry into the flotation box 1 through the feed pipe 203. After 0.5 seconds of starting the horizontal centrifugal slurry pump 202, the blower 301 is turned on. The blower 301 delivers gas to the polyurethane microporous aeration disk 303 through the gas pipe 302, and the polyurethane microporous aeration disk 303 begins to work. After the gangue slurry comes into contact with the flotation reagent, the coal powder in the gangue is separated and floats to the liquid surface. The remaining material sinks along a parabolic trajectory. During the sinking process, pyrite is separated from the remaining material and sinks along a parabolic trajectory into the pyrite collection hopper 6. The tailings sink along a parabolic trajectory into the tailings collection hopper 5. (4) When all the gangue slurry in the gangue slurry input mechanism 2 is transported to the flotation box 1 and there is no more solid movement in the flotation box 11, it is determined that the separation of coal powder, pyrite and tailings in the gangue is completed. First, the sealing plug 8 at the coal powder discharge port 7 is removed, and the coal powder floating on the liquid surface is discharged with the liquid through the coal powder discharge port 7 to the coal powder collection hopper 4. Then, the mixture of coal powder and liquid is filtered, dried and other solid-liquid separation operations are performed to obtain coal powder. When the flotation box When the liquid level in the body 1 drops below the coal powder discharge port 7, the sealing plug 8 of the drain port 10 is removed, and the liquid in the flotation box 1 is discharged from the drain port 10. After the liquid in the flotation box 1 is discharged, the sealing plugs 8 of the tailings outlet 11 and the pyrite outlet 12 are removed, and the materials discharged from the tailings outlet 11 and the pyrite outlet 12 are collected respectively. Thereafter, conventional solid-liquid separation operations are performed on the mixture of tailings and liquid, and the mixture of pyrite and liquid, to obtain tailings and pyrite.

[0051] In this embodiment, the polyurethane microporous aeration disc 303 has a diameter of 30 cm and a thickness of 18 mm, and is 40 cm away from the top surface of the pyrite collection hopper 6; the inclined side length of the rectangular baffle 305 is 30 cm and the thickness is 1.5 cm; the rectangular vertical baffle 9 is 2 cm thick; the distance between the end of the feed pipe 203 outputting the slurry and the left side wall of the flotation box 1 is 10 cm, and the horizontal extension section of the feed pipe 203 is 50 cm away from the top surface of the pyrite collection hopper 6.

[0052] The recovery rates of coal powder, pyrite and tailings in high-sulfur coal gangue in this embodiment are similar to those in Example 1.

[0053] Example 3 This embodiment uses a device to separate and recover high-sulfur coal gangue according to the following method: (1) Fatty acid methyl ester and sodium petroleum sulfonate were mixed in a mass ratio of fatty acid methyl ester to sodium petroleum sulfonate = 1:0.1 to obtain a collector. Methyl isobutyl carbinol (1 / 3 of the mass of the collector) was added to the collector as a foaming agent. Finally, lime was added to adjust the pH of the liquid to 8.0-9.0 to obtain a flotation agent. The flotation agent was added to the flotation box 1 until the flotation agent liquid level was higher than the top edge of the coal powder discharge port 7, and the amount of collector used was recorded.

[0054] (2) Grind the high-sulfur coal gangue to a particle size of 150-100 mesh, add the ground high-sulfur coal gangue into water, and prepare a coal gangue slurry, wherein the solid-liquid ratio of high-sulfur coal gangue to water is high-sulfur coal gangue: water = 1kg:3L.

[0055] (3) According to the ratio of 1 kg of collector to 1 t of high sulfur gangue, the corresponding mass of gangue slurry is added to the gangue slurry preparation storage tank 201 according to the amount of collector added to the flotation box 1, and the horizontal centrifugal slurry pump 202 is set to pump the slurry at a speed of 1.5 m / s. At the same time, the parameters of the blower 301 are set so that the aeration intensity of the polyurethane microporous aeration disk 303 is 1.2 cm / s, and then the horizontal centrifugal slurry pump 202 is turned on. The horizontal centrifugal slurry pump 202 extracts gangue slurry from the gangue slurry preparation and storage tank 201 and pumps the gangue slurry into the flotation box 1 through the feed pipe 203. After the horizontal centrifugal slurry pump 202 is turned on for 1 second, the blower 301 is turned on. The blower 301 delivers gas to the polyurethane microporous aeration disk 303 through the gas pipe 302, and the polyurethane microporous aeration disk 303 begins to work. After the gangue slurry comes into contact with the flotation reagent, the coal powder in the gangue is separated and floats to the liquid surface. The remaining material sinks along a parabolic trajectory. During the sinking process of the remaining material, pyrite is separated from the remaining material and sinks along a parabolic trajectory into the pyrite collection hopper 6. The tailings sink along a parabolic trajectory into the tailings collection hopper 5. (4) When all the gangue slurry in the gangue slurry input mechanism 2 is transported to the flotation box 1 and there is no more solid movement in the flotation box 1, it is determined that the separation of coal powder, pyrite and tailings in the gangue is completed. First, the sealing plug 8 at the coal powder discharge port 7 is removed, and the coal powder floating on the liquid surface is discharged with the liquid through the coal powder discharge port 7 to the coal powder collection hopper 4. Then, the mixture of coal powder and liquid is filtered, dried and other solid-liquid separation operations are performed to obtain coal powder. When the flotation box is closed, the coal powder is discharged. When the liquid level in the flotation tank 1 drops below the coal powder discharge port 7, the sealing plug 8 of the liquid discharge port 10 is removed, and the liquid in the flotation tank 1 is discharged from the liquid discharge port 10. After the liquid in the flotation tank 1 is discharged, the sealing plugs 8 of the tailings outlet 11 and the pyrite outlet 12 are removed, and the materials discharged from the tailings outlet 11 and the pyrite outlet 12 are collected respectively. Thereafter, conventional solid-liquid separation operations are performed on the mixture of tailings and liquid, and the mixture of pyrite and liquid, to obtain tailings and pyrite.

[0056] In this embodiment, the polyurethane microporous aeration disc 303 has a diameter of 40 cm and a thickness of 20 mm, and is 45 cm away from the top surface of the pyrite collection hopper 6; the inclined side of the rectangular baffle 305 is 35 cm long and 2 cm thick; the rectangular vertical baffle 9 is 3 cm thick; the distance between the end of the feed pipe 203 outputting the slurry and the left side wall of the flotation box 1 is 15 cm, and the distance between the horizontal extension section of the feed pipe 203 and the top surface of the pyrite collection hopper 6 is 55 cm.

[0057] The recovery rates of coal powder, pyrite and tailings in high-sulfur coal gangue in this embodiment are similar to those in Example 1.

[0058] Comparative Example 1 This comparative example uses the same method as Example 1 to collaboratively separate and recover coal powder, pyrite, and tailings from high-sulfur coal gangue, with the difference being that in this comparative example, no rectangular vertical baffle is provided.

[0059] After the coordinated recovery of coal powder, pyrite and tailings in high-sulfur coal gangue in this comparative example is completed, the recovery rates of coal powder and pyrite are calculated respectively, and the SiO2 content in the tailings is measured. The results are shown in Table 1.

[0060] Comparative Example 2 This comparative example uses the same method and apparatus as Example 1 to collaboratively separate and recover coal powder, pyrite, and tailings from high-sulfur coal gangue, with the difference being that in this comparative example, the collector is fatty acid methyl ester, and no sodium petroleum sulfonate is used.

[0061] After the coordinated recovery of coal powder, pyrite and tailings in high-sulfur coal gangue in this comparative example is completed, the recovery rates of coal powder and pyrite are calculated respectively, and the SiO2 content in the tailings is measured. The results are shown in Table 1.

[0062] Comparative Example 3 This comparative example uses the same method and apparatus as Example 1 to synergistically separate and recover coal powder, pyrite, and tailings from high-sulfur coal gangue, with the difference being that in this comparative example, the gangue slurry conveying speed is set to 1.0 m / s, and the aeration intensity is set to 0.8 cm / s.

[0063] After the coordinated recovery of coal powder, pyrite and tailings in high-sulfur coal gangue in this comparative example is completed, the recovery rates of coal powder and pyrite are calculated respectively, and the SiO2 content in the tailings is measured. The results are shown in Table 1.

[0064] Comparative Example 4 This comparative example uses the same method and apparatus as Example 1 to synergistically separate and recover coal powder, pyrite, and tailings from high-sulfur coal gangue, with the difference being that in this comparative example, the gangue slurry conveying speed is set to 2.0 m / s, and the aeration intensity is set to 1.6 cm / s.

[0065] After the coordinated recovery of coal powder, pyrite and tailings in high-sulfur coal gangue in this comparative example is completed, the recovery rates of coal powder and pyrite are calculated respectively, and the SiO2 content in the tailings is measured. The results are shown in Table 1.

[0066] Comparative Example 5 This comparative example uses the same method and apparatus as Example 1 to collaboratively separate and recover coal powder, pyrite, and tailings from high-sulfur coal gangue, with the difference being that in this comparative example, the obtuse angle formed by the rectangular baffle and the horizontal plane is 100°.

[0067] After the coordinated recovery of coal powder, pyrite and tailings in high-sulfur coal gangue in this comparative example is completed, the recovery rates of coal powder and pyrite are calculated respectively, and the SiO2 content in the tailings is measured. The results are shown in Table 1.

[0068] Comparative Example 6 This comparative example uses the same method and apparatus as Example 1 to collaboratively separate and recover coal powder, pyrite, and tailings from high-sulfur coal gangue, with the difference being that in this comparative example, the obtuse angle formed by the rectangular baffle and the horizontal plane is 90°.

[0069] After the coordinated recovery of coal powder, pyrite and tailings in high-sulfur coal gangue in this comparative example is completed, the recovery rates of coal powder and pyrite are calculated respectively, and the SiO2 content in the tailings is measured. The results are shown in Table 1.

[0070] Comparative Example 7 This comparative example uses the same method and apparatus as Example 1 to collaboratively separate and recover coal powder, pyrite, and tailings from high-sulfur coal gangue, with the difference being that in this comparative example, the rectangular vertical baffle is 20 cm high.

[0071] After the coordinated recovery of coal powder, pyrite and tailings in high-sulfur coal gangue in this comparative example is completed, the recovery rates of coal powder and pyrite are calculated respectively, and the SiO2 content in the tailings is measured. The results are shown in Table 1.

[0072] Comparative Example 8 This comparative example uses the same method and apparatus as Example 1 to collaboratively separate and recover coal powder, pyrite, and tailings from high-sulfur coal gangue, with the difference being that in this comparative example, the rectangular vertical baffle is 30 cm high.

[0073] After the coordinated recovery of coal powder, pyrite and tailings in high-sulfur coal gangue in this comparative example is completed, the recovery rates of coal powder and pyrite are calculated respectively, and the SiO2 content in the tailings is measured. The results are shown in Table 1.

[0074] Since the remaining materials after separation of coal powder from high-sulfur coal gangue mainly contain silicate substances in addition to pyrite, the SiO2 content can reflect the tailings recovery rate in the remaining materials.

[0075] By comparing Example 1 with Comparative Example 1, it can be seen that when the rectangular vertical baffle is not set in the device (Comparative Example 1), the recovery rates of coal powder, pyrite and tailings can basically be maintained at a relatively high level, and setting a rectangular vertical baffle can effectively further enhance the recovery rates of pyrite and tailings.

[0076] By comparing Example 1 with Comparative Example 2, it can be seen that the collector of the present invention can effectively promote the separation of coal powder and improve the recovery rate of coal powder. At the same time, the collector has a good inhibitory effect on the residual material, causing more residual material to move downward along the parabola, thereby promoting the separation of pyrite and tailings.

[0077] By comparing Example 1 with Comparative Examples 3 and 4, it can be seen that the coal gangue conveying speed and the aeration intensity of the polyurethane microporous aeration disc have a great influence on the synergistic separation and recovery of coal powder, pyrite and tailings in high-sulfur coal gangue. The present invention effectively improves the synergistic separation and recovery effect of coal powder, pyrite and tailings in high-sulfur coal gangue through the synergistic matching effect between parameters and the specific structure of the device.

[0078] By comparing Example 1 with Comparative Examples 5 and 6, it can be seen that the rectangular baffle does not significantly affect the separation of coal powder in high-sulfur coal gangue, indicating that after the high-sulfur coal gangue contacts the flotation agent, the coal powder is effectively separated and floats to the liquid surface.

[0079] By comparing Example 1 with Comparative Examples 7 and 8, it can be seen that the height of the rectangular vertical baffle has a certain influence on the separation effect of pyrite and tailings. The height of the rectangular vertical baffle of the present invention can significantly improve the separation effect of pyrite and tailings, thereby improving the recovery rate of pyrite and tailings.

[0080] In summary, the present invention effectively achieves a more efficient separation of coal powder, pyrite and tailings in high-sulfur coal gangue in one treatment through the coordinated design of device size and process parameters, thereby improving the recovery rate of coal powder, pyrite and tailings in high-sulfur coal gangue, enhancing the resource utilization rate of high-sulfur coal gangue, and reducing resource waste.

[0081] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and section without departing from the scope defined by the claims of the present invention.

Claims

1. A collaborative recovery device for coal powder, pyrite and tailings in high-sulfur coal gangue, characterized by: The device comprises a flotation box (1), a gangue slurry input mechanism (2), an aeration mechanism (3), a coal powder collection hopper (4), a tailings collection hopper (5), and a pyrite collection hopper (6). The flotation box (1) is a rectangular parallelepiped structure. The slurry output port of the gangue slurry input mechanism (2) extends horizontally through the left side wall of the flotation box (1) to the inside of the flotation box (1), and the gangue slurry is input into the flotation box (1). The aeration mechanism (3) passing through the left side wall of the flotation box (1) and extending into the interior of the flotation box (1), the pulverized coal collecting hopper (4) is fixedly mounted on the upper portion of the right side wall of the flotation box (1), a pulverized coal discharge port (7) is provided on the right side wall of the flotation box (1) to connect the pulverized coal collecting hopper (4) with the interior of the flotation box (1), the pulverized coal discharge port (7) is sealed by a sealing plug (8), and the bottom edge of the pulverized coal discharge port (7) is higher than the bottom surface of the pulverized coal collecting hopper (4); The tailings collecting hopper (5) and the pyrite collecting hopper (6) are fixedly arranged on the inner bottom surface of the flotation box (1). The tailings collecting hopper (5) and the pyrite collecting hopper (6) are both inverted prism structures. The side lengths of the top surfaces of the tailings collecting hopper (5) and the pyrite collecting hopper (6) from left to right are 1 / 2 of the side lengths of the flotation box (1) in the same direction. There is a gap between the front and rear sides of the top surfaces of the tailings collecting hopper (5) and the pyrite collecting hopper (6) and the front and rear side surfaces of the flotation box (1). The heights of the tailings collecting hopper (5) and the pyrite collecting hopper (6) are both The aeration mechanism (3) is located above the pyrite collecting hopper (6) and the distance between the aeration mechanism (3) and the top surface of the pyrite collecting hopper (6) is 40-45 cm. The slurry outlet of the gangue slurry input mechanism (2) is located above the pyrite collecting hopper (6) and the distance between the slurry outlet of the gangue slurry input mechanism (2) and the top surface of the pyrite collecting hopper (6) is 50-55 cm. The distance between the slurry outlet of the gangue slurry input mechanism (2) and the left side wall of the flotation box (1) is 10-15 cm.

2. The device according to claim 1, characterized in that: The gangue slurry input mechanism (2) comprises a gangue slurry preparation and storage tank (201), a horizontal centrifugal slurry pump (202), and a feed pipe (203). The gangue slurry preparation and storage tank (201) is connected to the feed port of the horizontal centrifugal slurry pump (202) through a pipeline. The discharge port of the horizontal centrifugal slurry pump (202) is connected to one end of the feed pipe (203). The other end of the feed pipe (203) passes through the left side wall of the flotation box (1) and extends horizontally into the interior of the flotation box (1). The distance between one end of the feed pipe (203) located inside the flotation box (1) and the left side wall of the flotation box (1) is 10 to 15 cm, and the distance between the horizontal extension section of the feed pipe (203) and the top surface of the pyrite collecting hopper (6) is 50 to 55 cm.

3. The device according to claim 2, characterized in that: One end of the feed pipe (203) located in the flotation box (1) is in an outwardly expanding bell-mouth structure, and the acute angle formed by the side wall of the outwardly expanding bell-mouth structure and the side wall of the horizontal section of the feed pipe (203) is 30°.

4. The device according to claim 1, characterized in that: The aeration mechanism (3) comprises a blower (301), an air supply pipe (302), and a polyurethane microporous aeration disk (303). The air outlet of the blower (301) is connected to one end of the air supply pipe (302), and the other end of the air supply pipe (302) passes through the left side wall of the flotation box (1) and is connected to the polyurethane microporous aeration disk (303). The left side wall of the polyurethane microporous aeration disk (303) contacts the left side wall of the flotation box (1), and the polyurethane microporous aeration disk (303) is horizontally arranged. The thickness of the polyurethane microporous aeration disk (303) is ≥15 mm, the distance between the bottom surface of the polyurethane microporous aeration disk (303) and the top surface of the pyrite collecting hopper (6) is 40-45 cm, and the diameter of the polyurethane microporous aeration disk (303) is 30-40 cm.

5. The device according to claim 4, characterized in that: The aeration mechanism (3) further comprises a horizontal connecting rod (304) and a rectangular baffle (305), one end of the horizontal connecting rod (304) being fixedly connected to the right side wall of the polyurethane microporous aeration disk (303), and the other end of the horizontal connecting rod (304) being fixedly connected to the bottom of the rectangular baffle (305), the rectangular baffle (305) being inclined toward the upper right, the obtuse angle formed between the rectangular baffle (305) and the horizontal plane being 105°, the inclined side length of the rectangular baffle (305) being 30-35 cm, the horizontal side length of the rectangular baffle (305) being the same as the diameter of the polyurethane microporous aeration disk (303), the thickness of the rectangular baffle (305) being 1.5-2 cm, and the length of the horizontal connecting rod (304) being 10 cm.

6. The device according to claim 1, characterized in that: A rectangular vertical baffle (9) is provided at the contact position of the top surfaces of the tailings collecting bucket (5) and the pyrite collecting bucket (6), wherein the rectangular vertical baffle (9) is 25 cm high and 2-3 cm thick, and the length of the top edge of the rectangular vertical baffle (9) is the same as the distance between the front and rear sides of the top of the tailings collecting bucket (5).

7. The device according to claim 1, characterized in that: A liquid discharge port (10), a tailings outlet (11), and a pyrite outlet (12) are provided on the bottom surface of the flotation box (1); the liquid discharge port (10) is located outside the encirclement of the tailings collecting bucket (5) and the pyrite collecting bucket (6); the tailings outlet (11) is located within the encirclement of the tailings collecting bucket (5); and the pyrite outlet (12) is located within the encirclement of the pyrite collecting bucket (6); the liquid discharge port (10), the tailings outlet (11), and the pyrite outlet (12) are all sealed by a sealing plug (8).

8. A method for the coordinated recovery of coal dust, pyrite and tailings from high-sulfur coal gangue, characterized by: The recovery method is carried out using the device according to any one of claims 1 to 7, comprising the following steps: S1: Fatty acid methyl ester and sodium petroleum sulfonate are mixed in a mass ratio of fatty acid methyl ester: sodium petroleum sulfonate = 1:0.05~0.1 to obtain a collector, and then methyl isobutyl carbinol (1 / 3 of the mass of the collector) is added to the collector as a foaming agent, and finally lime is added to adjust the liquid pH to 8.0~9.0 to obtain a flotation agent, and the flotation agent is added to the flotation box (1) so that the flotation agent liquid level is higher than the top edge of the coal powder discharge port (7), and the amount of collector used is recorded; S2: Grind the high-sulfur coal gangue to a particle size of 150-100 mesh, add the ground high-sulfur coal gangue to water, and prepare a coal gangue slurry, wherein the solid-liquid ratio of the high-sulfur coal gangue to water is high-sulfur coal gangue: water = 1 kg: 3 L; S3: According to the ratio of 1 kg of collector to 1 t of high-sulfur gangue, according to the amount of collector added to the flotation box (1), take the corresponding mass of gangue slurry and add it to the gangue slurry input mechanism (2). Set the speed of the gangue slurry input mechanism (2) to 1.5 m / s, and set the aeration intensity of the aeration mechanism (3) to 1.2 cm / s. Then open the gangue slurry input mechanism (2) and input the gangue slurry into the flotation box. In (1), 0.5 to 1 second after the gangue slurry input mechanism (2) is turned on, the aeration mechanism (3) is turned on. After the gangue slurry contacts the flotation agent, the coal powder in the gangue is separated and floats to the liquid surface. The remaining material sinks along a parabolic trajectory. During the sinking process of the remaining material, pyrite is separated from the remaining material and sinks along a parabolic trajectory into the pyrite collection hopper (6). The tailings sink along a parabolic trajectory into the tailings collection hopper (5). S4: When all the gangue slurry in the gangue slurry input mechanism (2) is transported to the flotation box (1) and no solids move in the flotation box (1), it is determined that the separation of coal powder, pyrite and tailings in the gangue is completed. First, the sealing plug (8) at the coal powder discharge port (7) is removed, and the coal powder floating on the liquid surface is discharged into the coal powder collection hopper (4) along with the liquid through the coal powder discharge port (7). When the liquid level in the flotation box (1) drops below the coal powder discharge port (7), the sealing plug (8) of the discharge port (10) is removed, and the liquid in the flotation box (1) is discharged from the discharge port (10). After the liquid in the flotation box (1) is discharged, the sealing plugs (8) of the tailings outlet (11) and the pyrite outlet (12) are removed, and the materials discharged from the tailings outlet (11) and the pyrite outlet (12) are collected respectively.

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