A calcium carbide slag utilization and treatment system

Abstract

This invention relates to the field of comprehensive recycling technology of calcium carbide slag, specifically to a calcium carbide slag utilization and processing system; it includes a classifier for screening coarse and fine powders, the inlet of the classifier being connected to an input unit, and the fine powder channel of the classifier being connected to a fine powder storage unit for storing fine powder; the coarse powder channel is connected to a second scraper conveyor via a flap valve, and the discharge port of the second scraper conveyor is connected to the coarse powder processing unit; a return air pipe is installed on the upper side of the second scraper conveyor, and the other end of the return air pipe is connected to a distributor via a bag filter; this system improves the recovery rate of fine powder.

Description

Technical Field

[0001] This invention relates to the field of comprehensive reuse technology of calcium carbide slag, and specifically to a calcium carbide slag utilization and treatment system. Background Technology

[0002] Currently, the treatment and reuse of calcium carbide slag first involves separating the coarse and fine powders. The main mineral component in the fine calcium carbide slag is Ca(OH)2, which is a chemical raw material used to produce propylene oxide or potassium chlorate, etc. The coarse calcium carbide slag is used to manufacture low-value-added cement. For example, after processing, the slurry concentration of the coarse raw material is concentrated to 35%. The concentrated slurry is then pumped into a feed trough through a sand pump to remove the supernatant. After adding sandstone and clay slurry, it is transported to a rotary kiln for calcination to produce cement.

[0003] Currently, coarse and fine powders of calcium carbide slag are separated by a classifier. The fine powder channel of the classifier is connected to the fine powder collection bin, which collects the adsorbed powder to form a fine powder product. A coarse powder channel is formed on the lower side of the classifier. Particles that are too large or have a heavy overall mass (called coarse powder) will fall directly into the coarse powder channel due to gravity and be discharged for subsequent processing. When the material is discharged from the coarse powder channel, some gas containing fine powder will still be discharged from the coarse powder channel. Some fine powder will be discharged with the gas and cannot be effectively recycled. Summary of the Invention

[0004] To address the problem of poor recovery rates caused by fine powder being discharged from the coarse powder channel with the gas in existing technologies, this invention provides a carbide slag utilization and treatment system.

[0005] The technical solution used in this invention is as follows: A carbide slag utilization and processing system includes a classifier for screening coarse powder and fine powder. The inlet of the classifier is connected to an input unit, and the fine powder channel of the classifier is connected to a fine powder storage unit for storing fine powder. The coarse powder channel is connected to a second scraper conveyor via a flap valve, and the discharge port of the second scraper conveyor is connected to a coarse powder processing unit. A return air pipe is provided on the upper side of the second scraper conveyor, and the other end of the return air pipe is connected to a distributor via a bag filter.

[0006] Furthermore, the input unit includes a first scraper conveyor, the output end of which is connected to a variable frequency feeder via a distributor; the output end of the variable frequency feeder is connected to the feed inlet of the powder classifier; the fine powder storage unit includes a fine powder collection chamber and a star-shaped unloader located at the bottom of the fine powder collection chamber.

[0007] Furthermore, the coarse powder processing unit includes a double-layer ultrasonic vibrating screen. The inlet of the ultrasonic vibrating screen is connected to the discharge port of the second scraper conveyor through an ash discharge valve. The first layer of the ultrasonic vibrating screen is provided with a first discharge outlet. A second discharge outlet is provided between the first layer of the screen and the second layer of the screen. The second discharge outlet is connected to the coarse powder collection chamber of the elevator. The coarse powder collection chamber is connected to the distributor through a pipe. A third discharge outlet is provided on the lower side of the second layer of the screen. The third discharge outlet is connected to the jig. The jig is connected to the iron ore bin and the thickener respectively.

[0008] Furthermore, the flap valve includes a valve body and a first valve plate and a second valve plate rotatably fitted onto the valve body; the first valve plate is rotatably fitted onto the upper side of the valve body via a first rotating shaft; the second valve plate is rotatably fitted onto the lower side of the valve body via a second rotating shaft; a counterweight is provided on the first rotating shaft and the second rotating shaft respectively, and a push wheel and a locking wheel are provided on both sides of the first rotating shaft and the second rotating shaft respectively; the push wheel of the first rotating shaft and the locking wheel of the second rotating shaft are vertically aligned, and the locking wheel of the first rotating shaft and the cam wheel of the second rotating shaft are vertically aligned; the linkage rod is rotatably fitted onto the outside of the valve body via a fixed shaft.

[0009] Furthermore, the linkage includes a central rotating sleeve, with a drive rod and a clamping rod on opposite sides of the linkage. When the first valve plate and the second valve plate are in a horizontal position, one side of the drive rod is fixed to the valve body by a tensioning element such as a spring or elastic band. The tensioning element causes one end of the drive rod to contact the push wheel, and there is a gap between the clamping rod and the locking wheel. The accumulation of coarse powder on the first valve plate drives the first valve plate to rotate, the rotation of the first rotating shaft drives the push wheel to rotate, and the push wheel drives the drive rod to rotate. The clamping rod locks the locking wheel. After the powder is released, the first valve plate returns to its original position.

[0010] Furthermore, a starting rod is provided on the side of the counterweight of the second rotating shaft near the second rotating shaft, and a limit switch SQ corresponding to the starting rod is provided on the outside of the valve body; the limit switch is connected to the control unit of the second scraper conveyor; the control unit includes a time relay KT and a relay KA; the coil of the time relay KT is connected in series with the limit switch SQ to form the first branch, and the limit switch SQ is a normally open limit switch; the coil of the relay KA is connected in series with the auxiliary normally open contact of the time relay KT to form the second branch; the first branch and the second branch are connected in parallel and then connected in series with the push button switch SB, and the second scraper conveyor is connected in series with the main normally open contact of the contactor KA.

[0011] Furthermore, the drive rod is made of a rigid material, and the clamping rod includes a first pressure rod and a first pressure bar, which are rotated together by a torsion spring.

[0012] Preferably, the return gas pipe adopts a double-layer sleeve structure, with the outer layer of the return gas pipe connected to the hot gas unit via a connecting pipe; the hot gas unit includes a first hot gas unit and a second hot gas unit, which are connected via a switching module; the first hot gas unit includes a heat-conducting pipe connected to the factory steam source, with the other end of the heat-conducting pipe connected to the switching module; a temperature sensor is provided on the side of the heat-conducting pipe near the switching module, and the temperature sensor is electrically connected to the controller; the second hot gas unit includes a steam generator, with the exhaust port of the steam generator connected to the switching module; the steam generator is electrically connected to the controller, and the controller controls the operation of the steam generator.

[0013] Furthermore, the switching module includes a switching housing; the switching housing includes a straight section and a discharge section connected to the straight section, the discharge section being connected to the outer layer of the return gas pipe; the two sides of the straight section are respectively connected to the first hot gas unit and the second hot gas unit; a switching block is slidably fitted inside the straight section; the straight section is provided with a hollow stop ring; during operation, steam from the first hot gas unit is introduced into the straight section, and the high-pressure steam pushes the switching block to slide towards the second hot gas unit side, contacting and sealing with the stop ring, and hot gas is introduced from the discharge section into the outer layer of the return gas pipe; when the first hot gas unit fails, the controller controls the steam generator to start, and the high-pressure steam generated by the steam generator pushes the switching block to slide towards the first hot gas unit side.

[0014] Furthermore, the stop ring is inclined toward the discharge section; the switching block includes two inwardly inclined pressure plates, which are connected by elastic elements such as springs; one pressure plate is in contact with the stop ring, and the other pressure plate corresponds to the discharge section.

[0015] The beneficial effects achieved by this invention are as follows: The process of this application generates no waste, causes no secondary pollution to the environment, and avoids wasting the calcium carbide slag during the entire recycling and reuse process. It can recycle the calcium carbide slag into four products: the first type of useful material collected is fine powder, caking material, refined iron raw material, and concentrated slurry. This application diversifies the reuse of calcium carbide slag, avoiding resource waste that is easily caused by using a single reuse method, and improving the reuse efficiency of calcium carbide slag. Furthermore, this application does not generate waste during the reuse of calcium carbide slag, thus avoiding secondary pollution to the environment and fully realizing energy conservation and environmental protection.

[0016] This invention also has the following features: In use, when the material on the flap plate accumulates to a certain extent and reaches the opening threshold, the first valve plate opens, the first rotating shaft rotates, driving the push wheel to rotate, and the push wheel drives the drive rod to rotate counterclockwise; the clamping rod contacts and clamps the locking wheel; thus, when the first valve plate is open, even if the second valve plate reaches the opening threshold, it will not open; ensuring that the powder classifier is in a closed state; after release, the first valve plate returns to its position; similarly, the second valve plate ensures that the first valve plate is locked when it is opened. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the carbide slag utilization and treatment system of the present invention. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the carbide slag utilization and treatment system of the present invention. Figure 2 .

[0019] Figure 3 This is a schematic diagram of the flap valve and the second scraper conveyor of the present invention.

[0020] Figure 4 This is a schematic diagram of the valve body structure of the present invention.

[0021] Figure 5 This is a schematic diagram of the first valve plate and the second valve plate of the present invention in a horizontal state.

[0022] Figure 6 This is a schematic diagram of the first valve plate rotating in the present invention.

[0023] Figure 7 This is a schematic diagram of the rotation state of the second valve plate of the present invention.

[0024] Figure 8 This is a schematic diagram of the linkage structure of the present invention.

[0025] Figure 9 This is a schematic diagram of the position of the starter lever of the present invention.

[0026] Figure 10 This is a schematic diagram of the electrical connection of the second scraper conveyor of the present invention.

[0027] Figure 11 This is a schematic diagram of the steam generator connection of the present invention.

[0028] Figure 12 This is a schematic diagram of the switching housing structure of the present invention.

[0029] Figure 13 This is a schematic diagram of the pressure plate structure of the present invention.

[0030] In the diagram, 1. Air classifier; 2. First scraper conveyor; 3. Distributor; 4. Variable frequency feeder; 5. Fine powder collection chamber; 6. Flip valve; 7. Second scraper conveyor; 8. Air return pipe; 9. Bag filter; 10. Ultrasonic vibrating screen; 11. Lifting machine; 12. Coarse powder collection chamber; 13. Jig; 14. Thickener; 15. Valve body; 16. First valve plate; 17. Second valve plate; 18. First rotating shaft; 9. Second rotating shaft; 20. Baffle; 21. Counterweight; 22. Push wheel; 23. Locking wheel; 24. Rotating sleeve; 25. Drive rod; 26. Pressure rod; 27. Tensioning component; 28. Starting rod; 29. ​​Connecting pipe; 30. Heat conduction pipe; 31. Temperature sensor; 32. Controller; 33. Steam generator; 34. Switching cover; 35. Switching block; 36. Stop ring; 37. Elastic component; 38. Pressure plate. Detailed Implementation

[0031] To facilitate understanding of the present invention by those skilled in the art, specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood through the specific circumstances.

[0033] Example 1

[0034] like Figure 1As shown, this invention provides a calcium carbide slag utilization and processing system, including a classifier 1 for screening coarse and fine powders; the classifier 1 has a feed inlet, a fine powder channel, and a coarse powder channel; the feed inlet of the classifier 1 is connected to an input unit. After the calcium carbide slag waste is transported from the upstream industry, it first enters the input system, which guides the calcium carbide slag into the classifier 1; specifically, the input unit includes a first scraper conveyor 2 (FU410 first scraper conveyor 2, air chain structure), the output end of the first scraper conveyor 2 is connected to a variable frequency feeder 4 through a distributor 3; the distributor 3 contains a distributor bar with a conical bottom structure; the variable frequency feeder 4 is used to divert the powder entering the calcium carbide slag, thereby controlling the flow. The intake volume of the powder enters the classifier 1; the fine powder channel is connected to the fine powder storage unit for storing fine powder; the fine powder storage unit includes a fine powder collection chamber 5 and a star-shaped discharger located at the bottom of the fine powder collection chamber; the classifier 1 screens the coarse and fine powders (cyclone principle), and the lighter fine powders enter the fine powder collection chamber 5 through the fine powder channel; the fine powder collection chamber 5 collects them to form a fine powder product, which can be used as a raw material for Ca(OH)2, a chemical raw material that can be used to prepare propylene oxide or potassium chlorate, etc.; the heavier coarse powders fall due to their own gravity and are discharged from the coarse powder channel; the coarse powder channel is connected to the second scraper conveyor 7 (FU270 scraper conveyor) through the flap valve 6. The function of flap valve 6 is as follows: Since the working principle of the classifier 1 is to use cyclone to separate dust, it requires a relatively sealed environment. When the accumulated weight of coarse powder from the carbide slag is less than the opening threshold of flap valve 6, flap valve 6 closes. When the material on the flap reaches a certain level, the flap opens, releasing the material to the next stage. After the material is released, flap valve 6 closes to seal the upstream equipment. This minimizes the connection between the classifier 1 and the outside world, improving the dust separation effect of the classifier 1. The discharge port of the second scraper conveyor 7 is connected to the coarse powder processing unit. The classifier 1 is under positive pressure, but even when flap valve 6 is opened intermittently, gas can still enter the second scraper conveyor 7. In the process of material discharge from the coarse powder channel, some gas containing fine powder will still be discharged from the coarse powder channel; the fine powder will be discharged with the gas; therefore, a return air pipe 8 is set on the upper side of the second scraper conveyor 7, which is connected to the inside of the second scraper conveyor 7 and connected to the bag filter 9; the gas is discharged from the bag filter 9; the fine powder is blocked by the filter bag of the bag filter 9, and the bag filter 9 will pass the collected fine powder back into the distributor 3 through the screw conveyor for further separation; this application improves the separation rate of fine powder by passing the second scraper conveyor 7 back into the distributor 3 through the return air pipe 8 and the bag filter 9, thereby solving the problem that some fine powder will be discharged with the gas and cannot be effectively recycled.

[0035] like Figure 2As shown, the coarse powder processing unit includes a double-layer ultrasonic vibrating screen 10. The inlet of the ultrasonic vibrating screen 10 is connected to the discharge port of the second scraper conveyor 7 via a discharge valve. The first layer of the ultrasonic vibrating screen 10 filters out the agglomerated material, which is collected through the first discharge outlet. The agglomerated material can be supplied to brick factories as raw material for the production of machine-made bricks. A second discharge outlet is provided between the first and second layers of screens. The second discharge outlet is connected to the feed inlet of the elevator 11 (NE type). The coarse powder residue filtered out by the second layer of screens is conveyed to the coarse powder collection chamber 12 by the elevator 11. The coarse powder collection chamber 12 is ventilated... The product in the coarse powder collection chamber 12 is connected to the distributor 3 through a pipeline; the product in the coarse powder collection chamber 12 is returned to the distributor 3 for recirculation. This cycle is repeated to further effectively recycle the coarse powder residue. After filtration by the second screen, the wastewater mixed with particulate matter is transported to the jig 13 through the third outlet. The jig 13 separates the wastewater containing particulate matter into refined iron raw material and concentrated slurry. The refined iron raw material is finally collected in the refined iron bin and can be used to refine ferrosilicon. The concentrated slurry in the jig 13 enters the thickener 14 for concentration to form a concentrated slurry product with a concentration of 35%. This product can be used as a raw material for making desulfurization slurry.

[0036] The process described in this application generates no waste, causes no secondary pollution to the environment, and avoids wasting the calcium carbide slag during the entire recycling and reuse process. It can recycle the calcium carbide slag into four products: the first type of useful material collected is fine powder, caking material, refined iron raw material, and concentrated slurry. This application diversifies the reuse of calcium carbide slag, avoiding the resource waste that can easily occur when using a single reuse method, and improving the reuse efficiency of calcium carbide slag. The reuse process of calcium carbide slag generated by this application does not generate waste, thus avoiding secondary pollution to the environment and fully realizing energy conservation and environmental protection.

[0037] Example 2

[0038] Since the classifier 1 works by using cyclones for dust separation, it requires a relatively sealed environment. In the existing technology, a flap valve 6 is used. One implementation of the flap valve 6 involves setting two separate flap valves 6 (not shown in the figure), each in an independent state. The first flap valve 6 is open, and the second flap valve 6 is closed. The coarse powder of the carbide slag falls into the second partition through the first flap valve 6. When the first flap valve 6 is closed, the second flap valve 6 is open, electrically discharging the coarse powder of the carbide slag into the second scraper conveyor 7. The entire process is relatively closed, minimizing the connection between the classifier 1 and the outside world, thus improving the dust separation effect of the classifier 1.

[0039] However, it was found during use that the two flap valves 6 are in a state of simultaneous opening, that is, when the first flap valve 6 and the second flap valve 6 are open at the same time; one embodiment of the flap valve 6 includes a valve body 15 and a first valve plate 16 and a second valve plate 17 rotatably fitted on the valve body 15. The valve body 15 has a rectangular cavity structure, with an inlet end formed on the upper side of the valve body 15 and a discharge end formed on the lower side of the valve body 15; the first valve plate 16 is rotatably fitted on the upper side of the valve body 15 through a first rotating shaft 18; The second valve plate 17 is rotatably fitted to the lower side of the valve body 15 via the second rotating shaft 19; two baffles 20 are provided on the side of the valve body 15 opposite to the rotating shaft; when the first valve plate 16 and the second valve plate 17 are in a horizontal position, they abut against the two second baffles 20 respectively to limit the movement; counterweights 21 are provided on the first rotating shaft 18 and the second rotating shaft 19 respectively; push wheels 22 and locking wheels 23 are provided on both sides of the first rotating shaft 18 and the second rotating shaft 19 respectively; the push wheels 22 are cams or eccentric wheels. The locking wheel 23 is a circular rubber wheel or a toothed wheel; the push wheel 22 and the locking wheel 23 are fixed to the first rotating shaft 18; the push wheel 22 of the first rotating shaft 18 corresponds vertically to the locking wheel 23 of the second rotating shaft 19, and the locking wheel 23 of the first rotating shaft 18 corresponds vertically to the cam wheel of the second rotating shaft 19; fixed shafts are provided on both sides of the valve body 15, and the linkage rod is rotatably engaged with the two sides through the fixed shafts; the linkage rod includes a rotating sleeve 24 in the middle, and drive rods 2 are provided on opposite sides of the linkage rod. 5 and clamping rod 26; when the first valve plate 16 and the second valve plate 17 are in a horizontal position, one side of the drive rod 25 is fixed to the valve body 15 by a tensioning member 27 such as a spring or elastic band, and the tensioning member 27 makes one end of the drive rod 25 contact the push wheel 22, and there is a gap between the clamping rod 26 and the locking wheel 23; the drive rod 25 is made of rigid material, and the clamping rod 26 can be an integral structure such as a rubber rod, or it can include a first pressure rod and a first pressure rod, and the first pressure rod and the first pressure rod are rotated and engaged by a torsion spring;

[0040] like Figure 6-7 As shown, during use, when the material on the flap plate accumulates to a certain extent and reaches the opening threshold, the first valve plate 16 opens, the first rotating shaft 18 rotates, driving the push wheel 22 to rotate, and the push wheel 22 pushes the drive rod 25 to rotate counterclockwise; the clamping rod 26 contacts and clamps the locking wheel 23; thus, when the first valve plate 16 is open, even if the second valve plate 17 reaches the opening threshold, it will not open; ensuring that the powder classifier 1 is in a closed state; after release, the first valve plate 16 returns to its position; similarly, the second valve plate 17 ensures that the first valve plate 16 is locked when it is opened.

[0041] Considering that the second scraper conveyor 7 is always in operation and consumes electricity, a further optimization of Embodiment 2 is as follows: a starting rod 28 is provided on the side of the counterweight 21 of the second rotating shaft 19 near the second rotating shaft 19, and a limit switch SQ corresponding to the starting rod 28 is provided on the outside of the valve body 15; when the second valve plate 17 is closed, the starting rod 28 contacts the limit switch SQ, causing the limit switch SQ to open; the limit switch and the second scraper conveyor 7 are connected to the control unit; during operation, when the gravity of the powder causes the second valve plate 17 to open, the starting rod 28 rotates and the limit switch SQ is turned on, and the second scraper conveyor 7 is started at a time through the control unit.

[0042] like Figure 10 As shown, the control unit includes a time relay KT and a relay KA; the coil of the time relay KT is connected in series with the limit switch SQ to form the first branch, and the limit switch SQ is a normally open limit switch; the coil of the relay KA is connected in series with the auxiliary normally open contact of the time relay KT to form the second branch; the first branch and the second branch are connected in parallel and then connected in series with the push button switch SB; the second scraper conveyor 7 is connected in series with the main normally open contact of the contactor KA.

[0043] When the control system is activated via the knife switch QF, and the second valve plate 17 is in the closed state, the starter rod 28 contacts the limit switch SQ, causing the limit switch to be in the open state. When coarse powder accumulates, gravity causes the second valve plate 17 to open, and the starter rod 28 moves away, turning the limit switch SQ on. The time relay KT is an instantaneous closing and delayed opening type. The auxiliary normally open contact of the time relay KT opens after a 60-second delay. After the powder falls, the second scraper conveyor 7 transports the coarse material. The opening of the second valve plate 17 is synchronized with the second scraper conveyor 7, thereby avoiding direct pressure from the powder on the second scraper conveyor 7, achieving simultaneous material feeding and transfer. When the second scraper is closed, the second scraper conveyor 7 stops, resulting in greater energy savings.

[0044] Example 3

[0045] The dust material after passing through the second scraper conveyor 7 contains moisture. After implementation, it was found that the condensed water droplets after exhaust mixing with the dust material caused wet material and caking. To solve this problem, the return air pipe 8 adopts a double-layered sleeve structure. The coarse dust from the second scraper conveyor 7 is introduced into the bag filter 9 through the inner pipe of the return air pipe 8. Figure 11As shown, the outer layer of the return gas pipe 8 is connected to the hot gas unit via the connecting pipe 29. Steam at 130°C is introduced into the outer layer of the return gas pipe 8, thus effectively solving this problem. The powder is relatively dry, making it easier to produce fine powder when reused. The hot gas unit includes a first hot gas unit and a second hot gas unit, connected by a switching module. The first hot gas unit includes a heat-conducting pipe 30, one end of which is connected to the factory's steam source, and the other end to the switching module. A temperature sensor 31 is located on the side of the heat-conducting pipe 30 near the switching module, and the temperature sensor 31 is electrically connected to the controller 32. The second hot gas unit includes a steam generator 33, the exhaust port of which is connected to the switching module. The steam generator 33 is electrically connected to the controller 32. When the factory's steam system malfunctions, i.e., the first hot gas unit fails, the heat level is less than 130°C. The controller 32 controls the steam generator 33 to start, providing high-temperature steam. The second hot gas unit of the steam system; the switching module includes a switching housing 34; the switching housing 34 includes a straight section and a discharge section connected to the straight section, the discharge section is connected to the connecting pipe 29 of the outer layer of the return gas pipe 8; the two sides of the straight section are respectively connected to the first hot gas unit and the second hot gas unit; a switching block 35 is slidably fitted inside the straight section, and two limiting protrusions are provided opposite to the straight section to limit the switching block 35; the straight section is provided with a hollow stop ring 36; during operation, the existing hot steam in the factory is introduced into the straight section through the first hot gas unit, and the high-pressure steam pushes the switching block 35 to slide towards the side of the second hot gas unit, contacting and sealing with the stop ring 36, and the hot gas is introduced into the outer layer of the return gas pipe 8 from the discharge section; when the steam system fault controller 32 in the factory controls the steam generator 33 to start, the high-pressure steam generated by the steam generator 33 pushes the switching block 35 to slide towards the side of the first hot gas unit to realize the reversal; the switching module realizes adaptive and driven reversal through the gas source to ensure the large flow rate of the steam pipeline.

[0046] like Figure 12-13 As shown, the two stop rings 36 are inclined toward the discharge section; the switching block 35 includes two inwardly inclined pressure plates 38, which are connected by elastic elements such as springs 37; one pressure plate 38 contacts the stop ring 36, and the other pressure plate 38 corresponds to the discharge section, and the steam blowing over it plays an auxiliary guiding role; the elastic element 37 plays a buffering role during the switching process, thereby improving the service life of the switching block 35.

[0047] Unless otherwise specified, the above methods of fixing all use common technical means employed by industry professionals, such as welding, nesting, or threaded fixing.

[0048] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A system for utilizing and treating calcium carbide slag, characterized in that: The system includes a classifier (1) for screening coarse and fine powders. The inlet of the classifier (1) is connected to an input unit, and the fine powder channel of the classifier (1) is connected to a fine powder storage unit for storing fine powder. The coarse powder channel is connected to a second scraper conveyor (7) via a flap valve (6), and the discharge port of the second scraper conveyor (7) is connected to a coarse powder processing unit. A return air pipe (8) is installed on the upper side of the second scraper conveyor (7), and the other end of the return air pipe (8) is connected to a distributor (3) via a bag filter (9). The input unit includes a first scraper conveyor (2), a second scraper conveyor (3), and a third scraper conveyor (4). The output end of a scraper conveyor (2) is connected to a variable frequency feeder (4) via a distributor (3); the output end of the variable frequency feeder (4) is connected to the inlet of a powder classifier (1); the fine powder storage unit includes a fine powder collection chamber (5) and a star-shaped discharger located at the bottom of the fine powder collection chamber (5); the coarse powder processing unit includes a double-layer ultrasonic vibrating screen (10), the inlet of which is connected to the discharge port of a second scraper conveyor (7) via a ash discharge valve; the first layer of the ultrasonic vibrating screen (10) is provided with a first discharge port; the first layer of the screen is connected to the second scraper conveyor (7) via a discharge valve. A second outlet is provided between the layers of screens. The second outlet is connected to the lifting machine (11) and the coarse powder collection chamber (12). The coarse powder collection chamber (12) is connected to the distributor (3) through a pipe. A third outlet is provided on the lower side of the second layer of screens. The third outlet is connected to the jig (13). The jig (13) is connected to the iron ore bin and the thickener (14) respectively. The return gas pipe (8) adopts a double-layer sleeve structure. The outer layer of the return gas pipe (8) is connected to the hot gas unit through the connecting pipe (29). The hot gas unit includes a first hot gas unit and a second hot gas unit. The first hot gas unit is connected to the second hot gas unit. The two hot gas units are connected through a switching module; the first hot gas unit includes a heat pipe (30) connected to the factory steam source, and the other end of the heat pipe (30) is connected to the switching module; a temperature sensor (31) is provided on the side of the heat pipe (30) near the switching module, and the temperature sensor (31) is electrically connected to the controller (32); the second hot gas unit includes a steam generator (33), and the exhaust port of the steam generator (33) is connected to the switching module; the steam generator (33) is electrically connected to the controller (32), and the controller (32) is used to control the steam generator (33) to turn on.

2. The carbide slag utilization and treatment system according to claim 1, characterized in that: The flap valve (6) includes a valve body (15) and a first valve plate (16) and a second valve plate (17) rotatably fitted on the valve body (15); the first valve plate (16) is rotatably fitted on the upper side of the valve body (15) via a first rotating shaft (18); the second valve plate (17) is rotatably fitted on the lower side of the valve body (15) via a second rotating shaft (19); a counterweight (21) is provided on the first rotating shaft (18) and the second rotating shaft (19) respectively; a push wheel (22) and a locking wheel (23) are provided on both sides of the first rotating shaft (18) and the second rotating shaft (19) respectively; the push wheel (22) of the first rotating shaft (18) and the locking wheel (23) of the second rotating shaft (19) are vertically aligned; the locking wheel (23) of the first rotating shaft (18) and the push wheel (22) of the second rotating shaft (19) are vertically aligned; the linkage rod is rotatably fitted on the outside of the valve body (15) via a fixed shaft.

3. The carbide slag utilization and treatment system according to claim 2, characterized in that: The linkage includes a central rotating sleeve (24), and a drive rod (25) and a clamping rod (26) are respectively provided on opposite sides of the linkage. When the first valve plate (16) and the second valve plate (17) are in a horizontal position, one side of the drive rod (25) is fixed to the valve body (15) by a tensioning member (27), and one end of the drive rod (25) is made to contact the push wheel (22) by the tensioning member (27). There is a gap between the clamping rod (26) and the locking wheel (23). The accumulation of coarse powder on the first valve plate (16) drives the first valve plate (16) to rotate. The rotation of the first rotating shaft (18) drives the push wheel (22) to rotate, and the push wheel (22) pushes the drive rod (25) to rotate. The clamping rod (26) locks the locking wheel (23). After the powder is released, the first valve plate (16) returns to its original position.

4. The carbide slag utilization and treatment system according to claim 1, characterized in that: The switching module includes a switching housing (34); the switching housing (34) includes a straight section and a discharge section connected to the straight section, the discharge section is connected to the connecting pipe (29) of the outer layer of the return pipe (8); the two sides of the straight section are respectively connected to the first hot gas unit and the second hot gas unit; a switching block (35) is slidably fitted inside the straight section; the straight section is provided with a hollow stop ring (36); during operation, the steam of the first hot gas unit enters the straight section, the high-pressure steam pushes the switching block (35) to slide towards the side of the second hot gas unit, and contacts and seals with the stop ring (36), and the steam enters the outer layer of the return pipe (8) from the discharge section; when the first hot gas unit fails, the controller (32) controls the steam generator (33) to start, and the high-pressure steam generated by the steam generator (33) pushes the switching block (35) to slide towards the side of the first hot gas unit.

5. The carbide slag utilization and treatment system according to claim 4, characterized in that: The stop ring (36) is inclined toward the discharge section; the switching block (35) includes two inwardly inclined pressure plates (38), which are connected by an elastic element (37); one pressure plate (38) is in contact with the stop ring (36), and the other pressure plate (38) corresponds to the discharge section.

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