Industrial fly ash pretreatment, solidification compression molding system

Abstract

The application belongs to the technical field of fly ash solidification and specifically relates to an industrial fly ash pretreatment and solidification compression molding system, which comprises a solidification molding maintenance yard, a solution buffer tank and a chelating agent preparation tank connected in circulation through pipelines. The solidification molding maintenance yard comprises a disc-shaped groove body, a vertical main shaft is arranged in the center of the groove body, and a compression molding device, a liquid distribution arm and a scraper in a radial distribution are circumferentially connected to the bottom end of the main shaft. A plurality of pressure-bearing conveying belts in a radial distribution are arranged on the bottom of the groove body, adjacent pressure-bearing conveying belts are separated through fan-shaped partition bodies, the pressure-bearing conveying belts are lower than the fan-shaped partition bodies, so that fly ash solidification channels are formed between adjacent fan-shaped partition bodies. The pretreatment, solidification molding and maintenance of fly ash are integrated in the solidification molding maintenance yard, the integration and continuity of fly ash treatment are realized, the treatment efficiency is greatly improved, a large amount of fly ash can be treated at a time, and the needs of centralized and large-scale treatment of industrial fly ash can be met.

Description

Technical Field

[0001] This invention relates to an industrial fly ash pretreatment, curing, and molding system, belonging to the field of fly ash curing technology. Background Technology

[0002] With the rapid development of industry, the amount of fly ash generated during industrial production is increasing day by day. Industrial fly ash contains a large number of heavy metal elements, such as lead, mercury, and cadmium. If these heavy metal elements are discharged directly into the environment without effective treatment, they will cause serious pollution to soil, water sources and atmosphere, thereby endangering human health and ecological balance.

[0003] Currently, the main technologies for treating industrial fly ash include solidification / stabilization, landfilling, and heat treatment. Among these, solidification / stabilization is a commonly used method. By adding solidifying agents or stabilizers to the fly ash, the heavy metal elements in the fly ash form stable compounds, reducing their migration and bioavailability, thereby achieving the goal of harmless treatment.

[0004] However, existing fly ash solidification / stabilization technologies have some shortcomings. On the one hand, their processing efficiency is low, and the single-batch processing capacity is limited. For example, the "Fly Ash Solidification Briquetting Machine" published in CN216330304U is insufficient to meet the demand for centralized, large-scale processing of industrial fly ash. On the other hand, the processing often consumes a large amount of water resources, and the generated waste liquid is difficult to treat, easily causing secondary pollution. Therefore, developing an industrial fly ash pretreatment, solidification, and molding system with high processing efficiency, large single-batch processing capacity, high resource recovery rate, and environmental friendliness is of significant practical importance. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an industrial fly ash pretreatment, curing and molding system with high processing efficiency, large single processing capacity and high resource recycling rate, so as to fill the gap in the prior art.

[0006] The industrial fly ash pretreatment, curing, and molding system of this invention includes a curing and molding storage yard, a solution buffer tank, and a chelating agent preparation tank, all connected by a pipeline. The curing and molding storage yard includes a disc-shaped tank with a suspended premixing cylinder at its center. The premixing cylinder is connected to a premixing cylinder inlet pipe and a pneumatic fly ash feed pipe. The premixing cylinder is a fully enclosed structure, with a gas filter at its top that communicates with the outside atmosphere. A vertical main shaft is also located at the center of the tank, penetrating the premixing cylinder. The top of the main shaft extends beyond the top surface of the premixing cylinder and is connected to a main motor, while the bottom of the main shaft extends beyond the bottom surface of the premixing cylinder. A radially distributed molding device and a cloth are connected circumferentially. The system includes a liquid arm and a scraper. The liquid arm has flow channels along its length, and the bottom surface of the liquid arm has several liquid distribution holes communicating with the flow channels. The main shaft has several guide holes circumferentially, and the part of the main shaft below the guide holes is hollow. The guide holes communicate with the flow channels in the liquid arm through the main shaft. The bottom of the tank has several radially distributed pressure conveyor belts, which are separated by fan-shaped partitions. The pressure conveyor belts are lower than the fan-shaped partitions to form fly ash solidification channels between adjacent fan-shaped partitions. The width of the compression molding device is adapted to the width of the fly ash solidification channels. The bottom center of the tank has a discharge port with an openable and closable discharge gate.

[0007] This invention utilizes a wet process to pretreat fly ash by mixing a chelating agent solution with the fly ash in a curing and solidification storage area. The chelating agent (such as organosulfur compounds or phosphates) reacts with heavy metals in the fly ash to form stable compounds, thereby reducing environmental hazards. After the reaction, the fly ash settles at the bottom of the tank, forming a sludge bed, while the solution floats on the upper layer. The upper layer of solution is extracted and transferred to a solution buffer tank. The fly ash sludge bed at the bottom is then molded and cured. The resulting solidified fly ash blocks are discharged through the outlet at the bottom of the tank for subsequent packaging, landfilling, or other treatment. In the next round of pretreatment, the solution in the buffer tank is replenished with chelating agent through a chelating agent preparation tank before being introduced into the curing and solidification storage area to react with newly arriving fly ash, thus achieving resource recovery (recycled water utilization rate >75%), reducing wastewater discharge, and meeting environmental emission standards. In this invention, the pretreatment, solidification, and curing of fly ash are all integrated within the solidification and curing stockpile, resulting in high processing efficiency and large single-processing capacity, making it suitable for centralized and large-scale processing of industrial fly ash.

[0008] The premixing cylinder is fixed to the bottom surface of the top beam of the tank. The liquid inlet pipe of the premixing cylinder and the pneumatic conveying fly ash feed pipe are connected to the side wall of the premixing cylinder and are centrally symmetrical about the axis of the premixing cylinder. The feeding direction of the liquid inlet pipe of the premixing cylinder and the pneumatic conveying fly ash feed pipe is along the tangent direction of the side wall of the premixing cylinder, so that the chelating agent and fly ash spontaneously form a swirling flow after entering the premixing cylinder.

[0009] Furthermore, the portion of the main shaft located inside the premixing cylinder is equipped with stirring blades, and the stirring direction is opposite to the swirling direction, thereby increasing the turbulence of the fluid inside the premixing cylinder, so that the chelating agent and fly ash are fully mixed, which is conducive to the full reaction.

[0010] In this invention, one end of the molding device, the liquid distribution arm, and the scraper are all connected to the main shaft, and the other end is equipped with a track trolley. A ring rail is provided along the inner wall of the tank, and the track trolley is located on the ring rail and can travel along the ring rail. The track trolley and the supporting ring rail increase the stability of the rotating module inside the tank and the load-bearing capacity of the main shaft. In addition, the track trolley can be self-powered to assist the rotation of the main shaft.

[0011] In this invention, the support frame of the pressure conveyor belt is a closed waterproof structure. The drive roller of the pressure conveyor belt is connected to a single-drive motor through a drive shaft. The drive roller and the single-drive motor are located at the bottom of the support frame and installed outside the bottom surface of the trough, so as not to be affected by the liquid environment or mud bed inside the trough.

[0012] In this invention, the compression molding device includes a support frame consisting of an upper support arm and a lower support arm. The upper support arm is equipped with multiple compression molding electric cylinders arranged along the length of the support frame. A pressure plate is provided below the lower support arm. The pressure plate is connected to the telescopic rod of the compression molding electric cylinder and is driven by the compression molding electric cylinder to complete the pressing action. The pressure plate is provided with multiple forming partition plates. The length direction of the forming partition plates is perpendicular to the length of the support frame. The pressing and molding of the solidified block and the split cutting are carried out simultaneously.

[0013] At the bottom of the tank, at the end of the fly ash solidification channel, there is a liftable molding gate. The width of the molding gate is adapted to the width of the fly ash solidification channel. Before and during molding, the molding gate is in the raised state to prevent the fly ash sludge bed in the fly ash solidification channel from flowing away.

[0014] In this invention, an electric heating coil is provided in the fan-shaped partition body near the pressure conveyor belt to provide a suitable temperature for curing and solidifying the molded block after molding.

[0015] In this invention, multiple vibration motors are installed on the bottom surface of the tank body. After the fly ash blocks are cured and solidified, the vibration motors can be started to vibrate the tank body so that the solidified fly ash blocks are separated from the side wall of the fan-shaped separator, which facilitates the discharge of the fly ash solidification tank in the next step.

[0016] Furthermore, a solidified block conveyor belt is provided below the discharge port. The output fly ash solidified blocks are transported to subsequent workstations via the solidified block conveyor belt for further packaging, landfilling, or other treatment.

[0017] The beneficial effects of this invention compared to the prior art are: 1. High processing efficiency and large single-processing capacity: This invention integrates the pretreatment, solidification and curing of fly ash into the solidification and curing stockpile, realizing the integration and continuity of fly ash treatment, greatly improving processing efficiency. At the same time, it has a large single-processing capacity, which can meet the needs of centralized large-scale processing of industrial fly ash.

[0018] 2. High resource recovery rate: This invention adopts a wet process, in which the chelating agent solution is mixed with fly ash for pretreatment in the curing and solidification stockpile. The solution after reaction can be recycled, reducing waste liquid discharge, or even achieving zero waste liquid discharge, and reducing treatment costs.

[0019] 3. Excellent environmental performance: During the fly ash pretreatment process, this invention utilizes a chelating agent to react with heavy metal elements in the fly ash to form stable compounds, effectively reducing the environmental hazards of the fly ash. Simultaneously, the premixing cylinder has a fully enclosed structure, preventing the escape of dust from the incoming fly ash.

[0020] In summary, the industrial fly ash pretreatment, curing and molding system of the present invention has high processing efficiency, large single processing capacity, high resource recycling rate and good environmental performance, and has broad application prospects in the field of industrial fly ash treatment. Attached Figure Description

[0021] Figure 1 This is one of the overall structural schematic diagrams of the present invention; Figure 2 This is the second schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram showing the view from the top of the curing and solidification storage yard; Figure 4 yes Figure 3 A magnified view of part A in the middle; Figure 5 This is a schematic diagram showing the bottom view of the curing and solidification storage yard. Figure 6 This is a schematic diagram of the internal structure of the premixing cylinder; Figure 7 yes Figure 6 A magnified view of part B in the middle; Figure 8 This is a schematic diagram showing the swirling and stirring directions inside the premixing cylinder. Figure 9 This is a schematic diagram of the internal structure of the tank; Figure 10 This is a schematic diagram of the liquid distribution arm; Figure 11 This is a structural schematic diagram of the compression molding device from the top view. Figure 12 This is a structural schematic diagram of the compression molding device from the bottom view; Figure 13 This is a structural schematic diagram of a pressure conveyor belt; Figure 14 This is a schematic diagram of the solidified block conveyor belt. Figure 15 This is a schematic diagram of the solution circulation in the system.

[0022] In the diagram: 1. Curing and molding storage yard; 2. Premixing drum; 3. Solution buffer tank; 4. Chelating agent preparation tank; 5. Gas filter; 6. Premixing drum inlet pipe; 7. Liftable liquid extraction pipe; 8. Pneumatic conveying fly ash inlet pipe; 9. Water tank inlet pipe; 10. Water tank outlet pipe; 11. Chelating agent conveying pipe; 12. Cured block conveyor belt; 13. Tank; 14. Circular track; 15. Compression molding device; 16. Liquid distribution arm; 17. Circular chute; 18. Discharge port; 19. Discharge gate; 20. Scraper; 21. Compression molding gate; 22. 23. Fan-shaped separator; 23. Pressure conveyor belt; 23.1. Bearing frame; 24. Crossbeam; 25. Main motor; 26. Track trolley; 27. Connecting plate; 27.1. Limiting baffle; 28. Drive roller; 29. ​​Single transmission motor; 30. Vibration motor; 31. Main shaft; 32. Stirring blades; 33. Layered flow equalizing ring plate; 34. Liquid guiding hole; 35. Liquid distribution hole; 36. Upper support arm; 37. Lower support arm; 38. Pressing cylinder; 39. Pressure plate; 40. Forming separator plate; 41. Drive shaft; 42. Clamping cylinder; 43. Alignment clamping plate. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments.

[0024] The description of the present invention is merely a structural or even functional description of the embodiments, and the scope of the present invention is not limited by the embodiments described herein.

[0025] like Figures 1-15 As shown, this embodiment is achieved through the following technical solution: an industrial fly ash pretreatment, curing and molding system, including a curing and molding storage yard 1, a solution buffer tank 3 and a chelating agent preparation tank 4, which are connected by pipeline circulation.

[0026] The curing and solidification storage yard 1 includes a disc-shaped tank 13 (diameter to height ratio greater than 6, with the bottom inclined towards the center at an angle of 5-8°). A crossbeam 24 is provided at the top of the tank 13, and a suspended premixing cylinder 2 is positioned at the center. The premixing cylinder 2 is fixed to the bottom surface of the crossbeam 24. The premixing cylinder 2 is connected to a premixing cylinder inlet pipe 6 and a pneumatic fly ash feed pipe 8. The premixing cylinder inlet pipe 6 and the pneumatic fly ash feed pipe 8 are connected to the side wall of the premixing cylinder 2 and are centrally symmetrically distributed around the axis of the premixing cylinder 2. The feeding direction of both the premixing cylinder inlet pipe 6 and the pneumatic fly ash feed pipe 8 is along the tangent direction of the side wall of the premixing cylinder 2, so that the chelating agent and fly ash spontaneously form a swirling flow after entering the premixing cylinder 2. A layered uniform flow ring plate 33 is provided on the inner wall of the premixing cylinder 2 below the outlets of the premixing cylinder inlet pipe 6 and the pneumatic fly ash feed pipe 8. The premixing cylinder 2 is a fully enclosed structure, and a gas filter 5 connected to the outside atmosphere is provided at the top of the premixing cylinder 2.

[0027] A vertical main shaft 31 is also provided in the center of the tank 13. The main shaft 31 passes through the premixing cylinder 2. The part of the main shaft 31 inside the premixing cylinder 2 is equipped with stirring blades 32, and the stirring direction is opposite to the swirling direction. The top end of the main shaft 31 extends out of the top surface of the premixing cylinder 2 and is connected to the main motor 25 located on the crossbeam 24. The bottom end of the main shaft 31 extends out of the bottom surface of the premixing cylinder 2 and is circumferentially connected to a radially distributed compression molding device 15, a liquid distribution arm 16, and a scraper 20.

[0028] The liquid distribution arm 16 has a flow channel along its length, and the bottom surface of the liquid distribution arm 16 has a plurality of liquid distribution holes 35 that communicate with the flow channel; the main shaft 31 has a plurality of liquid guiding holes 34 circumferentially, and the part of the main shaft 31 below the liquid guiding holes 34 is a hollow structure, and the liquid guiding holes 34 communicate with the flow channel in the liquid distribution arm 16 through the main shaft 31.

[0029] The compression molding device 15 includes a support frame consisting of an upper support arm 36 and a lower support arm 37. The upper support arm 36 is equipped with multiple compression molding electric cylinders 38 arranged along the length of the support frame. A pressure plate 39 is provided below the lower support arm 37. The pressure plate 39 is connected to the telescopic rod of the compression molding electric cylinder 38 and is driven by the compression molding electric cylinder 38 to complete the pressing action. The pressure plate 39 is provided with multiple forming partition plates 40. The length direction of the forming partition plates 40 is perpendicular to the length of the support frame. The pressing and molding of the solidified block and the split cutting are carried out simultaneously.

[0030] The bottom of the tank 13 is provided with several radially distributed pressure conveyor belts 23. Adjacent pressure conveyor belts 23 are separated by fan-shaped partitions 22. The pressure conveyor belts 23 are lower than the fan-shaped partitions 22, so that fly ash solidification channels are formed between adjacent fan-shaped partitions 22. The width of the molding device 15 is adapted to the width of the fly ash solidification channel; the scraper 20 is 1-2 cm away from the top surface of the fan-shaped partition 22. At the bottom of the tank 13, at the end of the fly ash solidification channel, there is a liftable molding gate 21. The width of the molding gate 21 is adapted to the width of the fly ash solidification channel. Before and during molding, the molding gate 21 is in the raised state to prevent the fly ash sludge bed in the fly ash solidification channel from spreading. In addition, an electric heating coil is provided inside the fan-shaped partition 22 near the pressure conveyor belts 23.

[0031] One end of the molding device 15, the liquid distribution arm 16, and the scraper 20 are all connected to the main shaft 31, and the other end is equipped with a track trolley 26. Specifically, the track trolley 26 is suspended and connected to the molding device 15, the liquid distribution arm 16, and the scraper 20 via a connecting plate 27. A ring rail 14 is provided along the inner wall of the tank 13. The track trolley 26 is located on the upper side of the ring rail 14 and can travel along the ring rail 14. A limiting baffle 27.1 is provided on the connecting plate 27 and the lower side of the ring rail 14, which together with the track trolley 26 forms a locking structure and locks onto the ring rail 14. The track trolley 26 and the supporting ring rail 14 increase the stability of the rotating module in the tank 13 and the load-bearing capacity of the main shaft 31. In addition, the track trolley 26 can be self-powered to assist the rotation of the main shaft 31.

[0032] The support frame 23.1 of the pressure conveyor belt 23 is a closed waterproof structure. The drive roller 28 of the pressure conveyor belt 23 is connected to the single-drive motor 29 through the drive shaft 41. The drive roller 28 and the single-drive motor 29 are located at the bottom of the support frame 23.1 and are installed outside the bottom surface of the trough 13, so they are not affected by the liquid environment or mud bed inside the trough 13.

[0033] Multiple vibration motors 30 are installed on the outer bottom surface of the tank 13.

[0034] The bottom center of the tank 13 is provided with a discharge port 18, and the discharge port 18 is provided with an openable and closable discharge gate 19; a solidified block conveyor belt 12 is provided below the discharge port 18, and a pair of straightening clamps 43 are provided at the material drop position of the solidified block conveyor belt 12.

[0035] This invention employs a wet process: chelating agent dissolution → fly ash mixing → stirring reaction (pretreatment) → fly ash settling (solid-liquid separation) → molding → curing → output. In the curing and solidification storage area, the chelating agent solution is mixed with fly ash for pretreatment. The chelating agent (such as organosulfur compounds, phosphates, etc.) reacts with heavy metals in the fly ash to form stable compounds, thus reducing environmental hazards. After the reaction, the fly ash settles to form a sludge bed at the bottom of the tank, while the solution floats on the upper layer. The upper layer of solution is extracted and transferred to a solution buffer tank. The fly ash sludge bed at the bottom is then molded and cured. The resulting solidified fly ash blocks are output through the outlet at the bottom of the tank for subsequent packaging, landfilling, or other treatments.

[0036] The specific process is as follows: Dissolving chelating agent: The chelating agent is added and prepared into a solution through the chelating agent preparation tank 4. The solution enters the premixing cylinder 2 through the chelating agent delivery pipe 11 and the premixing cylinder inlet pipe 6.

[0037] Mixed fly ash: Fly ash enters the premixing cylinder 2 through the pneumatic conveying fly ash feed pipe 8. After the chelating agent and fly ash enter the premixing cylinder 2, they spontaneously form a swirling flow above the layered uniform flow ring plate 33, which avoids the fly ash from directly settling to the bottom of the premixing cylinder 2 and causing insufficient mixing and reaction.

[0038] Stirring reaction: The stirring direction of the stirring blades 32 is opposite to the swirling direction, thereby increasing the turbulence of the fluid in the premixing cylinder 2, so that the chelating agent and fly ash are fully mixed, which is conducive to the full reaction. The premixing cylinder 2 is a fully enclosed structure, which can prevent fly ash dust from escaping, and the excess gas generated by the pneumatic output is depressurized through the gas filter 5 at the top of the premixing cylinder 2.

[0039] Fly ash settling (solid-liquid separation): The mixture in the premixing cylinder 2 enters the flow channel in the distribution arm 16 through the liquid guide hole 34 of the main shaft 31, and then is distributed into the tank 13 through several distribution holes 35 at the bottom of the distribution arm 16 (during which the main shaft 31 drives the distribution arm 16 to rotate). The fly ash quickly settles to the bottom of the tank 13 to form a mud bed. During this process, the scraper 20 continuously scrapes the mud bed, causing the fly ash mud bed on the surface of the fan-shaped separator 22 to fall onto the pressure conveyor belt 23 (in the fly ash solidification channel). The solution then flows to the center of the tank 13, where the liftable liquid extraction pipe 7 extracts the solution from the center of the tank 13 and transfers it to the solution buffer tank 3 through the water tank inlet pipe 9. In the next round of pretreatment, the solution in the solution buffer tank 3 is replenished with chelating agent through the chelating agent preparation tank 4 via the tank outlet pipe 10, and then enters the premixing tank 2 through the chelating agent delivery pipe 11 and the premixing tank inlet pipe 6. It reacts with the newly entered fly ash for pretreatment and is then fed into the tank 13 of the solidification and curing stockpile, thereby achieving resource recycling (circulating water utilization rate >75%) and reducing waste liquid discharge (or even no waste liquid discharge, the solution buffer tank 3 is replenished with water once after one round of fly ash solidification), meeting environmental emission standards.

[0040] Compression molding: When the compression molding device 15 rotates above a fly ash solidification channel, the compression molding electric cylinder 38 performs an action (the compression molding electric cylinder 38 can be energized through the ring rail 14 to avoid messy wiring on site), driving the pressure plate 39 to press down once. The bottom of the pressure plate 39 is equipped with multiple forming partition plates 40. The pressing and forming and the split cutting are carried out simultaneously. The step angle of the spindle 31 can be controlled by the stroke control switch or by setting the program, so that the compression molding device 15 stops rotating when it rotates above the fly ash solidification channel, and resumes rotation after the pressing and forming is completed.

[0041] Curing and solidification: The electric heating coil inside the fan-shaped partition 22 heats the fly ash sludge blocks formed in the fly ash solidification channel (the heating rate and amplitude need to be controlled to prevent the fly ash sludge blocks from cracking). After standing for a period of time, the moisture evaporates and a stable block is formed.

[0042] Output: The vibration motor 30 on the outer bottom surface of the tank 13 starts, causing the fly ash solidified blocks to detach from the side wall of the fan-shaped separator 22. The molding gate 21 descends, the discharge gate 19 opens, and the pressure conveyor belt 23 starts, conveying the fly ash solidified blocks on it to the center of the tank 13. The fly ash solidified blocks are output through the central annular chute 17 and the discharge port 18, falling onto the solidified block conveyor belt 12. The discharge position of the solidified block conveyor belt 12 is equipped with a pair of straightening clamps 43 driven by clamping cylinders 42, which can clamp and straighten the falling fly ash solidified blocks for subsequent stacking and packaging.

[0043] In this invention, the pretreatment, solidification, and curing of fly ash are all integrated within a solidification and curing stockpile, resulting in high processing efficiency and large single-batch processing capacity, making it suitable for centralized, large-scale treatment of industrial fly ash. This invention enables resource recycling (recycled water utilization rate >75%), reduces or even eliminates waste liquid discharge, and avoids the leakage of liquids from previous curing processes into the ground, thus meeting environmental emission standards.

[0044] The above description is merely a preferred embodiment of the present invention and should not be considered as limiting the scope of the embodiments of the present invention. The present invention is also not limited to the above examples; all equivalent changes and improvements made by those skilled in the art within the scope of the present invention should fall within the patent coverage of the present invention.

Claims

1. An industrial fly ash pretreatment, curing, and molding system, characterized in that, The solidification and curing storage yard (1), solution buffer tank (3) and chelating agent preparation tank (4) are connected by a pipeline. The solidification and curing storage yard (1) includes a disc-shaped tank (13). A suspended premixing cylinder (2) is set in the center of the tank (13). The premixing cylinder (2) is connected to the premixing cylinder inlet pipe (6) and the pneumatic conveying fly ash inlet pipe (8). The premixing cylinder (2) is a fully enclosed structure. A gas filter (5) connected to the outside atmosphere is provided at the top of the premixing cylinder (2). The tank (13) is also provided with a vertical main shaft (31) in the center. The main shaft (31) passes through the premixing cylinder (2). The top end of the main shaft (31) extends out of the top surface of the premixing cylinder (2) and is connected to the main motor (25). The bottom end of the main shaft (31) extends out of the bottom surface of the premixing cylinder (2). The circumferentially connected are a compression molding device (15), a liquid distribution arm (16) and a scraper (20) arranged in a radial pattern. The liquid distribution arm (16) is provided with a flow channel along its length. The bottom surface of the liquid distribution arm (16) has several liquid distribution holes (35) that communicate with the flow channel. The main shaft (31) is provided with several liquid guiding holes (34) in the circumferential direction. The part of the main shaft (31) below the liquid guiding holes (34) is a hollow structure. The liquid guiding holes (34) are connected to the flow channel in the liquid distribution arm (16) through the main shaft (31). The bottom of the tank (13) is provided with several radially distributed pressure conveyor belts (23). Adjacent pressure conveyor belts (23) are separated by fan-shaped separators (22). The pressure conveyor belts (23) are lower than the fan-shaped separators (22) so that fly ash solidification channels are formed between adjacent fan-shaped separators (22). The width of the molding device (15) is adapted to the width of the fly ash solidification channel. The bottom center of the tank (13) is provided with a discharge port (18), and the discharge port (18) is provided with an openable and closable discharge gate (19). The premixing cylinder (2) is fixed to the bottom surface of the top crossbeam (24) of the tank body (13). The premixing cylinder inlet pipe (6) and the pneumatic conveying fly ash feed pipe (8) are connected to the side wall of the premixing cylinder (2) and are centrally symmetrically distributed with respect to the axis of the premixing cylinder (2). The feeding direction of the premixing cylinder inlet pipe (6) and the pneumatic conveying fly ash feed pipe (8) is along the tangent direction of the side wall of the premixing cylinder (2) so that the chelating agent and fly ash spontaneously form a swirling flow after entering the premixing cylinder (2). The portion of the main shaft (31) located inside the premixing cylinder (2) has stirring blades (32), and the stirring direction is opposite to the swirling direction.

2. The industrial fly ash pretreatment, curing, and molding system according to claim 1, characterized in that, One end of the molding device (15), the liquid distribution arm (16) and the scraper (20) are all connected to the main shaft (31), and the other end is equipped with a track trolley (26); a ring rail (14) is provided along the inner wall of the tank (13), and the track trolley (26) is located on the ring rail (14) and can travel along the ring rail (14).

3. The industrial fly ash pretreatment, curing, and molding system according to claim 1, characterized in that, The bearing frame (23.1) of the pressure conveyor belt (23) is a closed waterproof structure. The drive roller (28) of the pressure conveyor belt (23) is connected to the single transmission motor (29) through the drive shaft (41). The drive roller (28) and the single transmission motor (29) are located at the bottom of the bearing frame (23.1) and installed outside the bottom surface of the trough (13).

4. The industrial fly ash pretreatment, curing, and molding system according to claim 1, characterized in that, The compression molding device (15) includes a support frame consisting of an upper support arm (36) and a lower support arm (37). The upper support arm (36) is equipped with multiple compression molding electric cylinders (38) arranged along the length of the support frame. A pressure plate (39) is provided below the lower support arm (37). The pressure plate (39) is connected to the telescopic rod of the compression molding electric cylinder (38) and is driven by the compression molding electric cylinder (38) to complete the pressing action. The pressure plate (39) is provided with multiple forming partition plates (40). The length direction of the forming partition plates (40) is perpendicular to the length of the support frame.

5. The industrial fly ash pretreatment, curing, and molding system according to claim 4, characterized in that, At the bottom of the tank (13), the end of the fly ash curing channel is provided with a liftable molding gate (21), the width of which is adapted to the width of the fly ash curing channel.

6. The industrial fly ash pretreatment, curing, and molding system according to claim 1, characterized in that, An electric heating coil is provided inside the fan-shaped partition (22) near the pressure conveyor belt (23).

7. The industrial fly ash pretreatment, curing, and molding system according to claim 1, characterized in that, Multiple vibration motors (30) are installed on the outer bottom surface of the trough (13).

8. The industrial fly ash pretreatment, curing, and molding system according to claim 1, characterized in that, A solidified block conveyor belt (12) is provided below the discharge port (18).

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