A resource utilization treatment system for phosphorus-containing fluorine slag

Abstract

The present application relates to the technical fields of phosphorus and fluorine-containing slag utilization, and discloses a resource utilization treatment system for phosphorus and fluorine-containing slag, which comprises a gas stripping reaction kettle and a tail gas treatment unit, and the sidewall of the gas stripping reaction kettle is provided with a gas pressure type exhaust mechanism, the gas pressure type exhaust mechanism comprises a small-diameter pipe, a large-diameter pipe, a conical plug valve and an elastic assembly, one end of the small-diameter pipe is communicated with the gas stripping reaction kettle, the other end is coaxially connected with the large-diameter pipe, the end of the large-diameter pipe away from the small-diameter pipe is connected with the tail gas treatment unit, the conical plug valve is arranged in the large-diameter pipe, the large-diameter end of the conical plug valve is fixedly provided with a mounting disc, the diameter of the mounting disc is larger than the inner diameter of the small-diameter pipe, the diameter of the mounting disc is smaller than the inner diameter of the large-diameter pipe, the diameter of the mounting disc is larger than the maximum diameter of the conical plug valve, the elastic assembly is arranged on the two sides of the conical plug valve, one end of the elastic assembly is connected with the mounting disc, and the other end is connected on the step formed by the small-diameter pipe and the large-diameter pipe. The present application is used for solving the problem of low utilization rate of the existing phosphorus and fluorine-containing slag.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of phosphorus and fluorine-containing slag utilization, in particular to a resource utilization treatment system for phosphorus and fluorine-containing slag. BACKGROUND

[0002] In the process of phosphogypsum yard sewage treatment, a large amount of phosphorus and fluorine-containing slag will be produced, and there is a large amount of citric acid-soluble phosphorus and fluorine in the phosphorus and fluorine-containing slag. At present, it is mainly used as a raw material for rice compound fertilizer, and its value is low. In the near future, with the improvement of people's living standards and the strengthening of food safety, China will also limit the harmful elements in fertilizers like Europe, the United States and Japan, and the fluorine content in fertilizers will also be limited. At this time, the way out of the phosphorus and fluorine-containing slag will face great challenges, and it will also threaten the survival of production enterprises. In the future, the productization of phosphogypsum, the high value-added and harmlessness of phosphorus and fluorine-containing slag are the survival key of phosphogypsum yard treatment. At present, the treatment process of phosphorus and fluorine-containing slag is gas stripping and then absorption. The gas stripping: the phosphorus and fluorine-containing slag is mixed with sulfuric acid, and the air is used as the gas medium for gas stripping. The generated tail gas is treated by a tail gas treatment device and then discharged, and the solid material is reacted with sulfuric acid again to generate phosphoric acid, and the resource utilization treatment of the phosphorus and fluorine-containing slag is completed. At present, the effect of the gas stripping reaction is not ideal, and the utilization rate of the phosphorus and fluorine-containing slag is low. Since the reaction of the phosphorus and fluorine-containing slag with sulfuric acid is greatly affected by the pressure and the mixing intensity, and the generated gas stripping is discharged into the tail gas treatment device in time, the current gas stripping device cannot maintain a specific pressure to treat the phosphorus and fluorine-containing slag. At the same time, the stirring intensity of the existing gas stripping device is low, and it cannot guarantee the sufficient mixing reaction of the phosphorus and fluorine-containing slag with sulfuric acid, so that the utilization rate of the phosphorus and fluorine-containing slag is low, and the resource utilization treatment of the phosphorus and fluorine-containing slag needs to be improved. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art, and provide a resource utilization treatment system for phosphorus and fluorine-containing slag, which is used to solve the problem of low utilization rate of the existing phosphorus and fluorine-containing slag.

[0004] The purpose of the present application is achieved by the following technical solutions: a phosphorus-containing fluororesidue resource utilization treatment system, comprising a gas stripping reaction kettle and a tail gas treatment unit, a stirring assembly is arranged in the gas stripping reaction kettle, a gas pressure exhaust mechanism is arranged on the side wall of the gas stripping reaction kettle, the gas pressure exhaust mechanism comprises a small-diameter pipe, a large-diameter pipe, a conical plug valve and an elastic assembly, one end of the small-diameter pipe is communicated with the gas stripping reaction kettle, the other end is coaxially connected with the large-diameter pipe, the end of the large-diameter pipe away from the small-diameter pipe is connected with the tail gas treatment unit, the conical plug valve is arranged in the large-diameter pipe, a mounting disc is fixed to the large-diameter end of the conical plug valve, the diameter of the mounting disc is greater than the inner diameter of the small-diameter pipe, the diameter of the mounting disc is less than the inner diameter of the large-diameter pipe, the diameter of the mounting disc is greater than the maximum diameter of the conical plug valve, the elastic assembly is arranged on both sides of the conical plug valve, one end of the elastic assembly is connected with the mounting disc, and the other end is connected on the step formed by the small-diameter pipe and the large-diameter pipe, when the small-diameter end of the conical plug valve is fitted in the small-diameter pipe, the elastic assembly is in a stretched state.

[0005] In some embodiments, the elastic assembly comprises a fixed cylinder, a hollow sliding cylinder and a spring, one end of the fixed cylinder is fixedly connected on the step formed by the small-diameter pipe and the large-diameter pipe, the other end is slidably connected with the hollow sliding cylinder, the spring is arranged in the fixed cylinder, and the two ends of the spring are respectively connected with the hollow sliding cylinder and the fixed cylinder, when the small-diameter end of the conical plug valve is fitted in the small-diameter pipe, the spring is in a stretched state.

[0006] In some embodiments, an elastic sealing sleeve is sleeved on the hollow sliding cylinder, and the elastic sealing sleeve is interference-fitted in the fixed cylinder through self-shape deformation.

[0007] In some embodiments, the side wall of the small-diameter pipe is fixedly provided with a mounting plate, a linear drive motor is mounted on the top of the mounting plate, a push rod is connected to the output shaft of the linear drive motor, the push rod penetrates into the fixed cylinder from the bottom of the large-diameter pipe, the push rod has the freedom of moving axially along the fixed cylinder, and the linear drive motor is connected with a switch assembly, which starts the linear drive motor after power-on delay.

[0008] In some embodiments, the switch assembly comprises a switch box, a battery, a time relay and an on-off switch, the switch box is mounted on the outer wall of the large-diameter pipe, the battery and the time relay are arranged in the switch box, the on-off switch is mounted on the inner wall of the large-diameter pipe, the on-off switch is located below the mounting disc and on the moving path of the mounting disc, the battery is connected to the time relay, the linear drive motor and the on-off switch in sequence through a positive electrode wire, and the on-off switch is connected to the negative electrode of the battery through a negative electrode wire.

[0009] In some embodiments, the on-off switch comprises a switch box, a switch button, a switch spring and a metal sheet, the switch box is fixedly mounted on the inner wall of the large-diameter pipe, the switch button slides through the top of the switch box and is located on the moving path of the mounting disc, the switch spring is arranged in the switch box, a mounting ring is arranged in the switch box, the mounting ring is fixedly sleeved on the switch button, the two ends of the switch spring are connected to the inner top of the switch box and the metal sheet respectively, the mounting ring is connected to the switch spring, the positive electrode wire is connected to the metal sheet, the negative pressure wire is connected to the negative pressure metal sheet in the switch box, the negative pressure metal sheet is located on the moving path of the metal sheet, when the small-diameter end of the conical plug valve is fitted in the small-diameter pipe, the negative pressure metal sheet contacts the metal sheet, and the switch spring is in a compressed state.

[0010] In some embodiments, the stirring assembly comprises a middle stirring shaft, an inner gear ring and a side stirring shaft, the middle stirring shaft, the inner gear ring and the side stirring shaft are all rotationally connected to the gas stripping reaction kettle, a driving gear is sleeved on the middle stirring shaft, a driven gear is sleeved on the side stirring shaft, the driven gear is located between the driving gear and the inner gear ring, the driven gear simultaneously meshes with the driving gear and the inner gear ring, a motor is arranged at the top of the gas stripping reaction kettle, an output shaft of the motor is transmissionally connected to the middle stirring shaft, a middle stirring blade is fixed on the middle stirring shaft, one end of a horizontal rocker is connected to the bottom of the side stirring shaft, a stirring shaft is fixed at the bottom of the other end of the horizontal rocker, and a side stirring blade is fixed on the stirring shaft.

[0011] In some embodiments, the stirring assembly further comprises a sealing disc, the sealing disc is located below the inner gear ring and is fixedly connected to the gas stripping reaction kettle, the middle stirring blade and the horizontal rocker are both located below the sealing disc, a first sealing ring is arranged between the middle stirring shaft and the sealing disc, and a second sealing ring is arranged between the side stirring shaft and the sealing disc.

[0012] In some embodiments, the tail gas treatment unit comprises a compressor, a gas buffer tank, a fluosilicic acid storage tank, two sets of microbubble generators arranged in parallel, a static mixer, a heat exchanger and a gas-liquid separation tank, one end of the large-diameter pipe is connected to the compressor through a gas inlet pipe, the gas outlet port of the compressor is connected to the gas inlet port of the gas buffer tank, the gas outlet port of the gas buffer tank is connected to the gas inlet port of the microbubble generator, the liquid outlet port of the fluosilicic acid storage tank is connected to the liquid inlet port of the flow pump through a liquid pipe, the liquid outlet port of the flow pump is connected to the liquid inlet port of the microbubble generator, the liquid outlet port of the microbubble generator is connected to the inlet port of the static mixer, the outlet port of the static mixer is connected to the heat exchanger, the heat exchanger is connected to the gas-liquid separation tank, the top of the gas-liquid separation tank is provided with a tail gas venting pipe, and the bottom of the gas-liquid separation tank is connected to the liquid pipe through a circulation pipe.

[0013] In some embodiments, the gas stripping reaction kettle is provided with a sulfuric acid feeding pipe, a feeding pipe and an air inlet pipe, and valves are arranged on the sulfuric acid feeding pipe, the feeding pipe and the air inlet pipe.

[0014] The beneficial effects of the present application are:

[0015] When the conical plug valve is adapted to block the small-diameter pipe, the spring is in a stretched state, so that the conical plug valve blocks the small-diameter pipe with a certain pressure through the reaction force of the spring. When the pressure in the gas stripping reaction kettle is greater than the action pressure of the conical plug valve, the conical plug valve moves away from the small-diameter pipe, so that the small-diameter pipe is connected to the large-diameter pipe to discharge part of the reaction generated tail gas. When the pressure in the gas stripping reaction kettle is less than the action force of the conical plug valve, the conical plug valve re-blocks the small-diameter pipe under the reaction force of the spring, waiting for the next time when the pressure is greater than the action force of the conical plug valve to discharge gas. Therefore, the reaction pressure in the gas stripping reaction kettle is always maintained within a predetermined pressure range, so that the reaction of the phosphorus-containing fluorine slag is more sufficient, and the utilization rate of the phosphorus-containing fluorine slag is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an internal structure diagram of a gas stripping reaction kettle in a resource utilization treatment system of phosphorus-containing fluorine slag according to the present application;

[0017] Figure 2 It is an internal structure diagram of a gas stripping reaction kettle in a resource utilization treatment system of phosphorus-containing fluorine slag according to the present application; Figure 1 It is an enlarged view of position A in the figure;

[0018] Figure 3 It is an enlarged view of position B in the figure; Figure 1 It is an enlarged view of position B in the figure;

[0019] Figure 4 It is a structure diagram of a tail gas treatment unit in a resource utilization treatment system of phosphorus-containing fluorine slag according to the present application;

[0020] In the figure, 1 - gas stripping reactor, 2 - small diameter pipe, 3 - large diameter pipe, 4 - conical plug valve, 5 - mounting plate, 6 - fixed cylinder, 7 - hollow sliding cylinder, 8 - spring, 9 - elastic sealing sleeve, 10 - mounting plate, 11 - linear drive motor, 12 - push rod, 13 - switch box, 14 - battery, 15 - time relay, 16 - on-off switch, 17 - positive lead, 18 - negative lead, 19 - switch box, 20 - switch button, 21 - switch spring, 22 - metal sheet, 23 - mounting ring, 24 - negative pressure metal sheet, 25 - middle stirring shaft, 26 - inner ring gear, 27 - side stirring shaft, 28 - drive gear, 29 - driven gear, 30 - motor, 31 - middle stirring blade, 32 - horizontal rocker, 33 - stirring shaft, 34 - side stirring blade, 35 - sealing disc, 36 - first sealing ring, 37 - second sealing ring, 38 - compressor, 39 - gas buffer tank, 40 - micro-bubble generator, 41 - static mixer, 42 - heat exchanger, 43 - gas-liquid separation tank, 44 - flow pump, 45 - liquid pipe, 46 - tail gas venting pipe, 47 - circulating pipe, 48 - sulfuric acid feeding pipe, 49 - feeding pipe, 50 - air inlet pipe. DETAILED DESCRIPTION

[0021] The technical solutions of the present application are described in further detail below in conjunction with the drawings, but the scope of protection of the present application is not limited to the following description.

[0022] As Figures 1 to 4The phosphorus-containing fluorine slag recycling system comprises a gas stripping reaction kettle 1 and a tail gas treatment unit. The gas stripping reaction kettle 1 is provided with a sulfuric acid feeding pipe 48, a feeding pipe 49 and an air inlet pipe 50. Valves are arranged on the sulfuric acid feeding pipe 48, the feeding pipe 49 and the air inlet pipe 50. The phosphorus-containing fluorine slag is fed into the gas stripping reaction kettle 1 through the feeding pipe 49, and then sulfuric acid is added into the gas stripping reaction kettle 1 through the sulfuric acid feeding pipe 48. The air inlet pipe 50 is used to introduce gas medium and provide the required pressure for the initial reaction in the gas stripping reaction kettle 1. A stirring assembly is arranged in the gas stripping reaction kettle 1 to mix the phosphorus-containing fluorine slag and the sulfuric acid sufficiently, thereby improving the reaction rate and the utilization rate of the phosphorus-containing fluorine slag. A gas pressure type exhaust mechanism is arranged on the side wall of the gas stripping reaction kettle 1. The gas pressure type exhaust mechanism comprises a small-diameter pipe 2, a large-diameter pipe 3, a conical plug valve 4 and an elastic assembly. One end of the small-diameter pipe 2 is communicated with the gas stripping reaction kettle 1, and the other end is coaxially connected with the large-diameter pipe 3. The end of the large-diameter pipe 3 away from the small-diameter pipe 2 is connected with the tail gas treatment unit. The conical plug valve 4 is arranged in the large-diameter pipe 3. A mounting disc 5 is fixed to the large-diameter end of the conical plug valve 4. The diameter of the mounting disc 5 is larger than the inner diameter of the small-diameter pipe 2, smaller than the inner diameter of the large-diameter pipe 3 and larger than the maximum diameter of the conical plug valve 4. The elastic assembly is arranged on both sides of the conical plug valve 4. One end of the elastic assembly is connected with the mounting disc 5, and the other end is connected to the step formed by the small-diameter pipe 2 and the large-diameter pipe 3. When the small-diameter end of the conical plug valve 4 is fitted in the small-diameter pipe 2, the elastic assembly is in a stretched state. The elastic assembly comprises a fixed cylinder 6, a hollow sliding cylinder 7 and a spring 8. One end of the fixed cylinder 6 is fixedly connected to the step formed by the small-diameter pipe 2 and the large-diameter pipe 3, and the other end is slidably provided with the hollow sliding cylinder 7. The spring 8 is arranged in the fixed cylinder 6 and connected to the hollow sliding cylinder 7 and the fixed cylinder 6. When the small-diameter end of the conical plug valve 4 is fitted in the small-diameter pipe 2, the spring 8 is in a stretched state. When the conical plug valve 4 is fitted in the small-diameter pipe 2 for plugging, the spring 8 is in a stretched state, so that the conical plug valve 4 is plugged in the small-diameter pipe 2 with a certain pressure through the reaction force of the spring 8. The phosphorus-containing fluorine slag will produce tail gas during the reaction, and the main component of the tail gas is hydrogen fluoride gas. As the tail gas is gradually produced, the pressure in the gas stripping reaction kettle 1 will gradually increase. When the pressure in the gas stripping reaction kettle 1 is greater than the acting pressure of the conical plug valve 4, the conical plug valve 4 moves away from the small-diameter pipe 2, so that the small-diameter pipe 2 is communicated with the large-diameter pipe 3 to discharge part of the tail gas generated during the reaction. When the pressure in the gas stripping reaction kettle 1 is less than the acting force of the conical plug valve 4, the conical plug valve 4 re-plugs the small-diameter pipe 2 under the reaction force of the spring 8, waiting for the next time when the pressure is greater than the acting force of the conical plug valve 4 to discharge the gas. Therefore, the reaction pressure in the gas stripping reaction kettle 1 is always maintained within a predetermined pressure range, so that the reaction of the phosphorus-containing fluorine slag is more sufficient, and the utilization rate of the phosphorus-containing fluorine slag is improved.In the implementation, the length of the spring 8 is installed according to the required pressure of the reaction, and when the tapered plug 4 is matched with the small diameter pipe 2, the extension length of the spring 8 is inconsistent, so that the reaction force generated by the spring 8 can be adjusted, and the reaction force generated by the spring 8 is substantially equal to the force of the tapered plug 4 required by the reaction pressure.

[0023] In some embodiments, as Figures 1 to 3When the phosphorus-containing fluorine slag reaction is close to the end, the pressure in the gas stripping reaction kettle 1 will not reach the strength of the conical plug valve 4 to move up to open the small diameter pipe 2, but the tail gas in the gas stripping reaction kettle 1 needs to be completely discharged after the reaction is completed, therefore, the side wall of the small diameter pipe 2 is fixed with a mounting plate 10, the top of the mounting plate 10 is provided with a linear drive motor 11, the output shaft of the linear drive motor 11 is connected with a push rod 12, the push rod 12 penetrates into the fixed cylinder 6 from the bottom of the large diameter pipe 3, the push rod 12 has the freedom of moving along the axis of the fixed cylinder 6, the linear drive motor 11 is connected with a switch assembly, the switch assembly starts the linear drive motor 11 after being powered on for a delay, the switch assembly includes a switch box 13, a storage battery 14, a time relay 15 and an on-off switch 16, the switch box 13 is installed on the outer wall of the large diameter pipe 3, the storage battery 14 and the time relay 15 are arranged in the switch box 13, the on-off switch 16 is installed on the inner wall of the large diameter pipe 3, the on-off switch 16 is located below the mounting disc 5 and on the moving path of the mounting disc 5, the storage battery 14 is connected with the time relay 15, the linear drive motor 11 and the on-off switch 16 in sequence through a positive electrode lead 17, the on-off switch 16 is connected with the negative electrode of the storage battery 14 through a negative electrode lead 18, the on-off switch 16 includes a switch box 19, a switch button 20, a switch spring 21 and a metal sheet 22, the switch box 19 is fixedly installed on the inner wall of the large diameter pipe 3, the switch button 20 is slidably arranged on the top of the switch box 19 and on the moving path of the mounting disc 5, the switch box 19 is provided with the switch spring 21, the switch box 19 is provided with a mounting ring 23, the mounting ring 23 is fixedly sleeved on the switch button 20, the two ends of the switch spring 21 are connected with the inner top of the switch box 19 and the metal sheet 22 respectively, the mounting ring 23 is connected with the switch spring 21, the positive electrode lead 17 is connected with the metal sheet 22, the negative pressure lead 18 is connected with a negative pressure metal sheet 24 in the switch box 19, the negative pressure metal sheet 24 is on the moving path of the metal sheet 22, when the small diameter end of the conical plug valve 4 is adapted in the small diameter pipe 2, the negative pressure metal sheet 24 contacts the metal sheet 22 and the switch spring 21 is in a compressed state, the storage battery 14 provides power for starting the linear drive motor 11 and is controlled by the time relay 15, the time relay 15 is a power-on delay relay, that is, after the time relay 15 is turned on, a certain time delay is needed to make the circuit connected to make the linear drive motor 11 conductive and start, based on this design, when the conical plug valve 4 blocks the small diameter pipe 2, the mounting disc 5 presses the switch button 20 to make the switch button 20 drive the metal sheet 22 to move close to the negative pressure metal sheet 24, the metal sheet 22 contacts the negative pressure metal sheet 24, the positive electrode lead 17 and the negative electrode lead 18 are connected, the switch button 20 makes the on-off switch 16 connected to the circuit, at this time, the switch spring 21 is in a compressed state and the time relay 15 starts timing and triggers in delay, within the time of the delay trigger, the strength in the gas stripping reaction kettle 1 increases to open the conical plug valve 4, the small diameter pipe 2 is opened to discharge gas, at this time, the mounting disc 5 moves away from the switch assembly,The switch button 20 is reset under the reaction force of the switch spring 21, so that the switch assembly disconnects the conduction loop of the linear drive motor 11, so that the linear drive motor 11 will not start. After the exhaust for a certain time, the conical plug valve 4 returns to the original position under the action of the spring 8. At this time, the mounting disc 5 triggers the switch 16 to turn on again, so that the time relay 15 is turned on to restart timing. As long as the tail gas is continuously generated in the gas stripping reactor 1 due to continuous reaction, the time relay 15 will not start. When the reaction in the gas stripping reactor 1 approaches the end, the pressure generated by the tail gas at the end of the gas stripping reactor 1 will not move the conical plug valve 4. At this time, the time relay 15 is timing, until the time relay 15 is turned on to the time of the delay trigger, and then the linear drive motor 11 is started. The linear drive motor 11 drives the push rod 12 to move, so that the push rod 12 acts on the mounting disc 5 to move the mounting disc 5 away from the small diameter pipe 2. The mounting disc 5 drives the conical plug valve 4 to separate from the small diameter pipe 2 until the mounting disc 5 moves away from the switch button 20. The switch button 20 moves away from the negative pressure metal sheet 24 under the action of the switch spring 21, so that the circuit of the linear drive motor 11 is disconnected, so that the linear drive motor 11 is stopped and kept in the state of opening the conical plug valve 4, so that the small diameter pipe 2 can be kept in the open state to completely discharge the tail gas in the gas stripping reactor 1. In this way, it is ensured that the gas stripping reactor can automatically control the reaction pressure and completely discharge the tail gas in the gas stripping reactor after the reaction is completed.

[0024] In some embodiments, as shown in Figure 2 The elastic sealing sleeve 9 is fitted in the fixed cylinder 6 by its own deformation interference fit. The gap between the outer wall of the hollow sliding cylinder 7 and the inner wall of the fixed cylinder 6 is eliminated by the elastic sealing sleeve 9, the sealing strength of the hollow sliding cylinder 7 and the fixed cylinder 6 is improved, and toxic hydrogen fluoride will not overflow to the outside air through the fixed cylinder 6. It should be noted that the reaction force generated by the spring 8 is much greater than the friction force generated by the elastic sealing sleeve 9, so that the conical plug valve 4 can be smoothly moved under the action of the spring 8.

[0025] In some embodiments, as shown in Figure 1As shown, the stirring assembly comprises a middle stirring shaft 25, an inner gear ring 26 and a side stirring shaft 27, all of which are rotationally connected to the gas stripping reactor 1, the middle stirring shaft 25 is sleeved with a driving gear 28, the side stirring shaft 27 is sleeved with a driven gear 29, the driven gear 29 is located between the driving gear 28 and the inner gear ring 26, the driven gear 29 meshes with the driving gear 28 and the inner gear ring 26 at the same time, the top of the gas stripping reactor 1 is provided with a motor 30, the output shaft of the motor 30 is transmissionally connected to the middle stirring shaft 25, the middle stirring shaft 25 is fixed with a middle stirring blade 31, the bottom of the side stirring shaft 27 is connected to one end of a horizontal rocker 32, the bottom of the other end of the horizontal rocker 32 is fixed with a stirring shaft 33, the stirring shaft 33 is fixed with a side stirring blade 34, the middle stirring shaft 25 is driven to rotate by the motor 30, the middle stirring shaft 25 drives the driving gear 28 and the middle stirring blade 31 to rotate, and the driving gear 28 drives the driven gear 29 to rotate, since the inner gear ring 26 is rotationally arranged, the driven gear 29 only has a rotational degree of freedom along its own axis, the driven gear 29 drives the side stirring shaft 27 to rotate, the side stirring shaft 27 drives the horizontal rocker 32 to rotate, the horizontal rocker drives the stirring shaft 33 and the side stirring blade 34 thereon to rotate, so that the side stirring blade 34 rotates eccentrically and has a large stirring range, thereby enhancing the stirring intensity, making the sulfuric acid fully react with the phosphorus and fluorine-containing slag, and improving the utilization rate of the phosphorus and fluorine-containing slag.

[0026] In some embodiments, as shown in Figure 1 The stirring assembly further comprises a sealing disc 35, which is located below the inner gear ring 26 and is fixedly connected to the gas stripping reactor 1, the middle stirring blade 31 and the horizontal rocker 32 are both located below the sealing disc 35, a first sealing ring 36 is arranged between the middle stirring shaft 25 and the sealing disc 35, and a second sealing ring 37 is arranged between the side stirring shaft 27 and the sealing disc 35, since the solution contains sulfuric acid, which has strong corrosiveness, in order to avoid the sulfuric acid splashing on the gears, the driving part of the stirring assembly is isolated from the reaction solution by the sealing disc 35, so as to avoid the corrosion of the driving components such as gears, and the sealing disc 35 and the components below it are made of materials that are not corroded by sulfuric acid, for example, glass, ceramic and the like, the sealing strength between the middle stirring shaft 25 and the sealing disc 35 is improved by the first sealing ring 36, the sealing strength between the side stirring shaft 27 and the sealing disc 25 is improved by the second sealing ring 37, and the first sealing ring 36 and the second sealing ring 37 are made of fluororubber, which has strong corrosion resistance.

[0027] In some embodiments, as shown in Figure 4As shown, the tail gas treatment unit includes a compressor 38, a gas buffer tank 39, a fluosilicic acid storage tank, a microbubble generator 40, a static mixer 41, a heat exchanger 42 and a gas-liquid separation tank 43, two sets of microbubble generators 40 are connected in parallel, one end of the large-diameter pipe 3 is connected to the compressor 38 through a gas inlet pipe, the gas outlet port of the compressor 38 is connected to the gas inlet port of the gas buffer tank 39, the gas outlet port of the gas buffer tank 39 is connected to the gas inlet port of the microbubble generator 40, the liquid outlet port of the fluosilicic acid storage tank is connected to the liquid inlet port of the flow pump 44 through a liquid pipe 45, the liquid outlet port of the flow pump 44 is connected to the liquid inlet port of the microbubble generator 40, the liquid outlet port of the microbubble generator 40 is connected to the inlet port of the static mixer 41, the outflow port of the static mixer 41 is connected to the heat exchanger 42, the heat exchanger 42 is connected to the gas-liquid separation tank 43, the top of the gas-liquid separation tank 43 is provided with a tail gas vent pipe 46, the bottom of the gas-liquid separation tank 43 is connected to the liquid pipe 45 through a circulating pipe 47, the fluosilicic acid storage tank stores 20% concentration of fluosilicic acid aqueous solution, 20% fluosilicic acid aqueous solution is used to absorb 1% hydrogen fluoride gas (tail gas) in the tail gas, the tail gas temperature is about 120 DEG C, since the content of the component to be absorbed in the hydrogen fluoride is small, it is necessary to pressurize and increase the circulation amount of the liquid to ensure good gas-liquid mixing effect, therefore, the tail gas is pressurized by the compressor 38, and then enters the microbubble generator 40, at the same time, the fluosilicic acid solution enters the microbubble generator 40 to absorb the hydrogen fluoride in the tail gas, the gas-liquid discharged from the microbubble generator 40 passes through the static mixer 41 to ensure a certain residence time, the static mixer 41 is provided with an adjusting valve interlocking loop to ensure the pressure in the whole system, thereby reducing the gas-liquid ratio and ensuring good mixing effect of the gas phase and the liquid phase, after absorption, the heat exchanger is used for cooling, and finally the gas-liquid separation tank 43 is used for gas-liquid separation, the liquid flows into the liquid pipe 45 through the circulating pipe 47 and is reused.

[0028] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application; and it is known to those skilled in the art that the beneficial effects to be achieved by the present application are only better beneficial effects compared with the current implementation in the prior art in specific cases, and not directly the best use effect in the industry.

[0029] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and operation described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the claims below and their equivalents.

Claims

1. A resource utilization and treatment system for phosphorus- and fluorine-containing slag, characterized in that, The system includes a stripping reactor (1) and a tail gas treatment unit. The stripping reactor (1) is equipped with a stirring assembly. A pneumatic exhaust mechanism is installed on the side wall of the stripping reactor (1). The pneumatic exhaust mechanism includes a small-diameter pipe (2), a large-diameter pipe (3), a conical plug valve (4), and an elastic component. One end of the small-diameter pipe (2) is connected to the stripping reactor (1), and the other end is coaxially connected to the large-diameter pipe (3). The end of the large-diameter pipe (3) away from the small-diameter pipe (2) is connected to the tail gas treatment unit. The conical plug valve (4) is installed inside the large-diameter pipe (3). The large-diameter end of the pipe is fixed with a mounting plate (5). The diameter of the mounting plate (5) is larger than the inner diameter of the small-diameter pipe (2). The diameter of the mounting plate (5) is smaller than the inner diameter of the large-diameter pipe (3). The diameter of the mounting plate (5) is larger than the maximum diameter of the conical plug valve (4). The elastic component is provided on one side of the conical plug valve (4). One end of the elastic component is connected to the mounting plate (5), and the other end is connected to the step formed by the small-diameter pipe (2) and the large-diameter pipe (3). When the small-diameter end of the conical plug valve (4) is adapted to the small-diameter pipe (2), the elastic component is in a stretched state. The elastic component includes a fixed cylinder (6), a hollow sliding cylinder (7), and a spring (8). One end of the fixed cylinder (6) is fixedly connected to the step formed by the small diameter pipe (2) and the large diameter pipe (3), and the other end is slidably inserted through the hollow sliding cylinder (7). The fixed cylinder (6) is provided with the spring (8). The two ends of the spring (8) are respectively connected to the hollow sliding cylinder (7) and the fixed cylinder (6). When the small diameter end of the conical plug valve (4) is adapted to the small diameter pipe (2), the spring (8) is in a stretched state. A mounting plate (10) is fixed to the side wall of the small-diameter tube (2). A linear drive motor (11) is mounted on the top of the mounting plate (10). A push rod (12) is connected to the output shaft of the linear drive motor (11). The push rod (12) passes through the bottom of the large-diameter tube (3) into the fixed cylinder (6). The push rod (12) has the freedom to move along the axial direction of the fixed cylinder (6). The linear drive motor (11) is connected to a switch assembly. The linear drive motor (11) is started after a delay when the switch assembly is energized. The switch assembly includes a switch box (13), a battery (14), a time relay (15), and a turn-on switch (16). The switch box (13) is installed on the outer wall of the large-diameter pipe (3). The battery (14) and the time relay (15) are both located inside the switch box (13). The turn-on switch (16) is installed on the inner wall of the large-diameter pipe (3). The turn-on switch (16) is located below the mounting plate (5) and is located on the moving path of the mounting plate (5). The battery (14) is connected to the time relay (15), the linear drive motor (11), and the turn-on switch (16) in sequence through a positive wire (17). The turn-on switch (16) is connected to the negative terminal of the battery (14) through a negative wire (18). The switch (16) includes a switch box (19), a switch button (20), a switch spring (21), and a metal plate (22). The switch box (19) is fixedly installed on the inner wall of the large-diameter pipe (3). The switch button (20) slides through the top of the switch box (19) and is located on the moving path of the mounting plate (5). The switch spring (21) is provided inside the switch box (19). A mounting ring (23) is provided inside the switch box (19). The mounting ring (23) is fixedly sleeved on the switch button (20). The two sides of the switch spring (21) The ends are respectively connected to the inner top of the switch box (19) and the metal plate (22). The mounting ring (23) is connected to the switch spring (21). The positive wire (17) is connected to the metal plate (22). The negative wire (18) is connected to the negative pressure metal plate (24) inside the switch box (19). The negative pressure metal plate (24) is located on the moving path of the metal plate (22). When the small diameter end of the conical plug valve (4) is adapted to the small diameter tube (2), the negative pressure metal plate (24) contacts the metal plate (22), and the switch spring (21) is in a compressed state.

2. The resource utilization and treatment system for phosphorus-containing fluorine slag according to claim 1, characterized in that, An elastic sealing sleeve (9) is fitted on the hollow sliding cylinder (7), and the elastic sealing sleeve (9) is interference-fitted into the fixed cylinder (6) by its own deformation.

3. The resource utilization and treatment system for phosphorus-containing fluorine slag according to claim 1, characterized in that, The stirring assembly includes a central stirring shaft (25), an internal gear ring (26), and a side stirring shaft (27). The central stirring shaft (25), the internal gear ring (26), and the side stirring shaft (27) are all rotatably connected to the gas stripping reactor (1). A drive gear (28) is mounted on the central stirring shaft (25), and a driven gear (29) is mounted on the side stirring shaft (27). The driven gear (29) is located between the drive gear (28) and the internal gear ring (26), and the driven gear (29) simultaneously meshes with the drive gear (28). The drive gear (28) and the internal gear ring (26) are combined. A motor (30) is installed on the top of the gas stripping reactor (1). The output shaft of the motor (30) is connected to the central stirring shaft (25). A central stirring blade (31) is fixed on the central stirring shaft (25). The bottom of the side stirring shaft (27) is connected to one end of a horizontal rocker arm (32). A stirring shaft (33) is fixed at the bottom of the other end of the horizontal rocker arm (32). A side stirring blade (34) is fixed on the stirring shaft (33).

4. The resource utilization and treatment system for phosphorus-containing fluorine slag according to claim 3, characterized in that, The stirring assembly also includes a sealing disc (35), which is located below the internal gear ring (26) and is fixedly connected to the gas stripping reactor (1). The central stirring blade (31) and the horizontal rocker arm (32) are both located below the sealing disc (35). A first sealing ring (36) is provided between the central stirring shaft (25) and the sealing disc (35), and a second sealing ring (37) is provided between the side stirring shaft (27) and the sealing disc (35).

5. The resource utilization and treatment system for phosphorus-containing fluorine slag according to claim 1, characterized in that, The exhaust gas treatment unit includes a compressor (38), a gas buffer tank (39), a fluorosilicic acid storage tank, a microbubble generator (40), a static mixer (41), a heat exchanger (42), and a gas-liquid separator (43). Two sets of the microbubble generator (40) are connected in parallel. One end of the large-diameter pipe (3) is connected to the compressor (38) through an inlet pipe. The outlet port of the compressor (38) is connected to the inlet port of the gas buffer tank (39). The outlet port of the gas buffer tank (39) is connected to the inlet port of the microbubble generator (40). The outlet of the fluorosilicic acid storage tank is connected to the gas-liquid separator (43). The liquid pipe (45) is connected to the inlet port of the flow pump (44), the outlet port of the flow pump (44) is connected to the inlet port of the microbubble generator (40), the outlet port of the microbubble generator (40) is connected to the inlet port of the static mixer (41), the outlet port of the static mixer (41) is connected to the heat exchanger (42), the heat exchanger (42) is connected to the gas-liquid separator (43), the top of the gas-liquid separator (43) is provided with a tail gas vent pipe (46), and the bottom of the gas-liquid separator (43) is connected to the liquid pipe (45) through a circulation pipe (47).

6. The resource utilization and treatment system for phosphorus-containing fluorine slag according to claim 1, characterized in that, The gas stripping reactor (1) is equipped with a sulfuric acid inlet pipe (48), a feeding pipe (49) and an air inlet pipe (50), and valves are provided on the sulfuric acid inlet pipe (48), the feeding pipe (49) and the air inlet pipe (50).

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