Industrial fly ash pretreatment and curing compression molding system

Abstract

The invention belongs to the technical field of fly ash curing, and particularly relates to an industrial fly ash pretreatment and curing compression molding system which comprises a curing molding maintenance storage yard, a solution buffer water tank and a chelating agent preparation tank which are circularly connected through a pipeline, the curing molding maintenance storage yard comprises a disc-shaped groove body, and a vertical main shaft is arranged in the center of the groove body; the bottom end of the main shaft is circumferentially connected with a compression molding device, a liquid distribution arm and a scraping plate which are radially distributed; a plurality of pressure-bearing conveying belts which are distributed in a radioactive mode are distributed at the bottom of the groove body, every two adjacent pressure-bearing conveying belts are separated through a fan-shaped separation body, and the pressure-bearing conveying belts are lower than the fan-shaped separation bodies so that a fly ash solidification groove channel can be formed between every two adjacent fan-shaped separation bodies. The steps of pretreatment, curing forming, curing and the like of the fly ash are integrated in the curing forming and curing storage yard, integration and continuity of fly ash treatment are achieved, the treatment efficiency is greatly improved, meanwhile, the single-time treatment capacity is large, and the requirement for centralized and large-amount treatment of industrial fly ash can be met.

Description

Technical Field

[0001] The present invention relates to an industrial fly ash pretreatment, solidification and compression molding system, belonging to the technical field of fly ash solidification. Background Art

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

[0003] At present, the treatment technologies for industrial fly ash mainly include solidification / stabilization treatment, landfill treatment, heat treatment, etc. Among them, solidification / stabilization treatment is a relatively common method. By adding solidifying agents or stabilizers to fly ash, the heavy metal elements in the fly ash form stable compounds, reducing their mobility and bioavailability, so as to achieve the purpose of harmless treatment.

[0004] However, the existing fly ash solidification / stabilization treatment technologies have some deficiencies. On the one hand, the treatment efficiency is low and the single treatment volume is limited. For example, the "block press for fly ash solidification" with the publication number CN216330304U is difficult to meet the demand for centralized and large-scale treatment of industrial fly ash. On the other hand, a large amount of water resources are often consumed during the treatment process, and the generated waste liquid is difficult to treat, easily causing secondary pollution. Therefore, it is of great practical significance to develop an industrial fly ash pretreatment, solidification and compression molding system with high treatment efficiency, large single treatment volume, high resource recycling rate and environmental protection. Summary of the Invention

[0005] According to the above deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide an industrial fly ash pretreatment, solidification and compression molding system with high treatment efficiency, large single treatment volume and high resource recycling rate to fill the blank in the prior art.

[0006] The industrial fly ash pretreatment, solidification, molding and forming system described in the present invention includes a solidification, molding and curing yard, a solution buffer water tank and a chelating agent preparation tank that are connected in a pipeline loop. The solidification, molding and curing yard includes a disk-shaped trough body. A suspended premixing cylinder is arranged in the center of the trough body. The premixing cylinder is connected to a premixing cylinder liquid inlet pipe and a pneumatically transported fly ash feed pipe. The premixing cylinder is a fully enclosed structure, and a gas filter communicating with the outside atmosphere is provided at the top of the premixing cylinder. A vertical main shaft is also arranged in the center of the trough body. The main shaft penetrates through the premixing cylinder. The top end of the main shaft extends out of the top surface of the premixing cylinder and is connected to the main motor. The bottom end of the main shaft extends out of the bottom surface of the premixing cylinder and is circumferentially connected with a die pressing and forming device, a liquid distribution arm and a scraper that are distributed in a radioactive manner. A flow channel is arranged in the liquid distribution arm along its length direction, and a number of liquid distribution holes communicating with the flow channel are opened on the bottom surface of the liquid distribution arm. A number of liquid guiding holes are arranged circumferentially on the main shaft. The part of the main shaft below the liquid guiding holes is a hollow structure, and the liquid guiding holes are communicated with the flow channel in the liquid distribution arm through the main shaft. A number of pressure-bearing conveyor belts distributed in a radioactive manner are arranged at the bottom of the trough body. The adjacent pressure-bearing conveyor belts are separated by a fan-shaped separator. The pressure-bearing conveyor belt is lower than the fan-shaped separator, so that a fly ash solidification channel is formed between the adjacent fan-shaped separators. The width of the die pressing and forming device is adapted to the width of the fly ash solidification channel. An outlet is arranged in the center of the bottom of the trough body, and an openable and closable discharge gate is arranged at the outlet.

[0007] In the present invention, through a wet process, the chelating agent solution is mixed with fly ash in the solidification, molding and curing yard for pretreatment. The chelating agent (such as organic sulfide, phosphate, etc.) reacts with the heavy metal elements in the fly ash to form stable compounds, so as to reduce the environmental hazard degree. The reacted fly ash settles at the bottom of the trough body to form a mud bed, and the solution floats on the upper layer of the trough body. The solution on the upper layer of the trough body is pumped out and transferred to the solution buffer water tank. Then, the fly ash mud bed at the bottom is subjected to die pressing and forming and curing and maintenance, and the formed fly ash solidification block is output through the outlet at the bottom of the trough body for subsequent packing and landfill or other treatments. When it comes to the next round of pretreatment, the solution in the solution buffer water tank is supplemented with chelating agent through the chelating agent preparation tank and then input into the trough body of the solidification, molding and curing yard to carry out pretreatment reaction with the newly entered fly ash, so as to achieve resource recycling (circulating water utilization rate > 75%), reduce waste liquid discharge and meet the environmental protection emission standards. The pretreatment, solidification, molding and curing of fly ash in the present invention are all integrated in the solidification, molding and curing yard, with high treatment efficiency and large single treatment volume, and is suitable for centralized and large-scale treatment of industrial fly ash.

[0008] Among them, the premixing cylinder is fixed to the bottom surface of the cross beam at the top of the trough body. The premixing cylinder liquid inlet pipe and the pneumatically transported fly ash feed pipe are connected to the side wall of the premixing cylinder and are symmetrically distributed around the axis of the premixing cylinder. The feeding directions of the premixing cylinder liquid inlet pipe and the pneumatically transported fly ash feed pipe are both along the tangential direction of the side wall of the premixing cylinder, so that the chelating agent and fly ash spontaneously form a swirl after entering the premixing cylinder.

[0009] Further, the part of the main shaft located inside the premixing cylinder is provided with stirring blades, and the stirring direction is opposite to the swirling direction, thereby increasing the degree of chaos of the fluid inside the premixing cylinder, enabling the chelating agent to be fully mixed with the fly ash and facilitating the full progress of the reaction.

[0010] In the present invention, one ends of the die pressing and forming device, the liquid distribution arm and the scraper are all connected to the main shaft, and the other ends are all equipped with rail trolleys; a circular rail is provided along the inner wall of the tank body, and the rail trolleys are located on the circular rail and can travel along the circular rail. Through the rail trolleys and the supporting circular rail, the stability of the rotating module inside the tank body and the load-bearing capacity of the main shaft are increased. In addition, the rail trolleys can be self-powered to assist the rotation of the main shaft.

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

[0012] In the present invention, the die pressing and forming device includes a support frame composed of an upper support arm and a lower support arm. The upper support arm is equipped with a plurality of die pressing electric cylinders arranged along the length direction of the support frame. A pressing plate is provided below the lower support arm. The pressing plate is connected to the telescopic rod of the die pressing electric cylinder and completes the pressing action driven by the die pressing electric cylinder; the pressing plate is provided with a plurality of forming partition plates, and the length direction of the forming partition plates is perpendicular to the length of the support frame, and the downward pressing and forming and the split cutting of the curing block are carried out synchronously.

[0013] At the bottom of the tank body, a liftable die pressing and forming gate plate is provided at the end of the fly ash curing channel. The width of the die pressing and forming gate plate is adapted to the width of the fly ash curing channel. Before and during die pressing and forming, the die pressing and forming gate plate is in a raised state to prevent the fly ash mud bed in the fly ash curing channel from flowing away.

[0014] In the present invention, inside the fan-shaped partition, an electric heating coil is provided near the pressure-bearing conveyor belt for providing a suitable temperature after die pressing and forming to cure and form the curing block.

[0015] In the present invention, a plurality of vibration motors are installed on the outer bottom surface of the tank body. After the fly ash block is cured and formed, the vibration motors can be started to vibrate the tank body so that the fly ash curing block is separated from the side wall of the fan-shaped partition, which is beneficial for the next step of discharging from the fly ash curing channel.

[0016] Further, a curing block conveyor belt is provided below the discharge port, and the output fly ash curing block is conveyed to the subsequent station through the curing block conveyor belt for the next step of packing, landfilling or other treatments.

[0017] The beneficial effects of the present invention compared with the prior art are:

[0018] 1. High processing efficiency and large single - batch processing capacity: The present invention integrates the steps of fly ash pretreatment, solidification and molding, curing, etc. in the solidification - molding and curing yard, realizing the integration and continuity of fly ash treatment, greatly improving the processing efficiency. At the same time, the single - batch processing capacity is large, which can meet the demand for centralized and large - scale treatment of industrial fly ash.

[0019] 2. High resource recycling rate: The present invention adopts a wet process. In the solidification - molding and curing yard, the chelating agent solution is mixed with fly ash for pretreatment, and the reaction solution can be recycled, reducing waste liquid discharge, and even achieving zero waste liquid discharge, thus reducing the treatment cost.

[0020] 3. Good environmental protection performance: During the fly ash pretreatment process of the present invention, stable compounds are formed by the reaction of the chelating agent with heavy metal elements in the fly ash, effectively reducing the environmental hazard degree of the fly ash. At the same time, the premixing cylinder has a fully enclosed structure, which can prevent the dust from escaping during fly ash input.

[0021] In summary, the industrial fly ash pretreatment, solidification and molding system described in the present invention has high processing efficiency, large single - batch processing capacity, high resource recycling rate, and good environmental protection performance, and has broad application prospects in the field of industrial fly ash treatment. Description of the Drawings

[0022] Figure 1 is one of the overall structural schematic diagrams of the present invention;

[0023] Figure 2 is the second overall structural schematic diagram of the present invention;

[0024] Figure 3 is the schematic diagram from the top view of the solidification - molding and curing yard;

[0025] Figure 4 is Figure 3 the partial enlarged view of part A in

[0026] Figure 5 is the schematic diagram from the bottom view of the solidification - molding and curing yard

[0027] Figure 6 is the internal structural schematic diagram of the premixing cylinder;

[0028] Figure 7 is Figure 6 the partial enlarged view of part B in

[0029] Figure 8 is the schematic diagram of the swirling direction and stirring direction inside the premixing cylinder,

[0030] Figure 9 is the internal structural schematic diagram of the trough;

[0031] Figure 10It is a schematic structural diagram of the liquid distribution arm;

[0032] Figure 11 It is a schematic structural diagram of the top view of the compression molding device;

[0033] Figure 12 It is a schematic structural diagram of the bottom view of the compression molding device;

[0034] Figure 13 It is a schematic structural diagram of the pressure-bearing conveyor belt;

[0035] Figure 14 It is a schematic structural diagram of the cured block conveyor belt;

[0036] Figure 15 It is a schematic diagram of the solution circulation in the system.

[0037] In the figure: 1. Curing and forming maintenance yard; 2. Premixing cylinder; 3. Solution buffer water tank; 4. Chelating agent preparation tank; 5. Gas filter; 6. Premixing cylinder inlet pipe; 7. Liftable liquid extraction pipe; 8. Pneumatic conveying fly ash feed pipe; 9. Water tank inlet pipe; 10. Water tank outlet pipe; 11. Chelating agent conveying pipe; 12. Cured block conveyor belt; 13. Tank body; 14. Ring track; 15. Compression molding device; 16. Liquid distribution arm; 17. Annular chute; 18. Discharge port; 19. Discharge gate; 20. Scraper; 21. Compression molding gate; 22. Sector partition; 23. Pressure-bearing conveyor belt; 23.1. Bearing frame; 24. Cross beam; 25. Main motor; 26. Rail car; 27. Connecting plate; 27.1. Limit baffle; 28. Driving roller; 29. Single transmission motor; 30. Vibration motor; 31. Main shaft; 32. Stirring blade; 33. Stratified flow equalizing ring plate; 34. Liquid guiding hole; 35. Liquid distribution hole; 36. Upper support arm; 37. Lower support arm; 38. Compression molding electric cylinder; 39. Pressing plate; 40. Forming partition plate; 41. Driving shaft; 42. Opposing clamp cylinder; 43. Rectifying clamp plate. Specific embodiments

[0038] The present invention will be further described below in conjunction with specific embodiments.

[0039] The description of the present invention is only an embodiment of the structural and even functional description. The scope of the rights of the present invention is not limited by the embodiments described in the text.

[0040] As Figures 1 to 15 shown, this embodiment is achieved through the following technical solutions: An industrial fly ash pretreatment and curing compression molding system includes a curing and forming maintenance yard 1, a solution buffer water tank 3, and a chelating agent preparation tank 4 that are connected in a pipeline cycle.

[0041] The curing and forming maintenance yard 1 includes a disk-shaped trough 13 (the ratio of the diameter to the cylinder height is greater than 6, and the bottom inclines towards the center with an inclination angle of 5-8°). There is a cross beam 24 at the top of the trough 13, and a suspended premixing cylinder 2 is arranged at the center. The premixing cylinder 2 is fixed to the bottom surface of the cross beam 24. The premixing cylinder 2 is connected to a premixing cylinder liquid inlet pipe 6 and a pneumatic conveying fly ash feed pipe 8. The premixing cylinder liquid 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 symmetrically distributed around the axis of the premixing cylinder 2. The feeding directions of the premixing cylinder liquid inlet pipe 6 and the pneumatic conveying fly ash feed pipe 8 are both along the tangential direction of the side wall of the premixing cylinder 2, so that the chelating agent and the fly ash spontaneously form a swirl after entering the premixing cylinder 2. On the inner wall of the premixing cylinder 2, there is a ring of layered flow equalizing plates 33 below the outlets of the premixing cylinder liquid inlet pipe 6 and the pneumatic conveying fly ash feed pipe 8. The premixing cylinder 2 is a fully enclosed structure, and a gas filter 5 communicating with the outside atmosphere is arranged at the top of the premixing cylinder 2.

[0042] A vertical main shaft 31 is also arranged at the center of the trough 13. The main shaft 31 penetrates through the premixing cylinder 2. The part of the main shaft 31 inside the premixing cylinder 2 is provided with stirring blades 32, and the stirring direction is opposite to the swirl direction. The top end of the main shaft 31 extends out of the top surface of the premixing cylinder 2 and is connected to a main motor 25 located on the cross beam 24. The bottom end of the main shaft 31 extends out of the bottom surface of the premixing cylinder 2 and is circumferentially connected with a die pressing and forming device 15, a liquid distribution arm 16 and a scraper 20 which are radially distributed.

[0043] Among them, a flow channel is arranged inside the liquid distribution arm 16 along its length direction, and a number of liquid distribution holes 35 communicating with the flow channel are opened on the bottom surface of the liquid distribution arm 16. A number of liquid guiding holes 34 are arranged circumferentially on the main shaft 31. The part of the main shaft 31 below the liquid guiding holes 34 is a hollow structure, and the liquid guiding holes 34 are communicated with the flow channel inside the liquid distribution arm 16 through the main shaft 31.

[0044] The die pressing and forming device 15 includes a support frame composed of an upper support arm 36 and a lower support arm 37. A number of die pressing electric cylinders 38 arranged along the length direction of the support frame are installed on the upper support arm 36. A pressing plate 39 is arranged below the lower support arm 37. The pressing plate 39 is connected to the telescopic rod of the die pressing electric cylinder 38 and completes the downward pressing action driven by the die pressing electric cylinder 38. The pressing plate 39 is provided with a number of forming partition plates 40. The length direction of the forming partition plates 40 is perpendicular to the length of the support frame, and the downward pressing forming and the split cutting of the curing block are carried out synchronously.

[0045] At the bottom of the trough body 13, several pressure-bearing conveyor belts 23 distributed radially are arranged. The adjacent pressure-bearing conveyor belts 23 are separated by fan-shaped partition bodies 22. The pressure-bearing conveyor belts 23 are lower than the fan-shaped partition bodies 22, so as to form a fly ash solidification channel between adjacent fan-shaped partition bodies 22. The width of the die pressing and forming 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 body 22. At the bottom of the trough body 13, a liftable die pressing and forming gate plate 21 is arranged at the end of the fly ash solidification channel. The width of the die pressing and forming gate plate 21 is adapted to the width of the fly ash solidification channel. Before and during die pressing and forming, the die pressing and forming gate plate 21 is in a raised state to prevent the fly ash mud bed in the fly ash solidification channel from flowing away. In addition, inside the fan-shaped partition body 22, an electric heating coil is arranged near the pressure-bearing conveyor belt 23.

[0046] One ends of the die pressing and forming device 15, the liquid distribution arm 16 and the scraper 20 are all connected to the main shaft 31, and the other ends are all equipped with rail trolleys 26. Specifically, the rail trolleys 26 are suspended and connected to the die pressing and forming device 15, the liquid distribution arm 16 and the scraper 20 through connecting plates 27. A circular rail 14 is arranged along the inner wall of the trough body 13. The rail trolleys 26 are located above the circular rail 14 and can travel along the circular rail 14; on the connecting plate 27, a limit baffle 27.1 is arranged below the circular rail 14, and together with the rail trolley 26, a clamping structure is formed and clamped on the circular rail 14. Through the rail trolleys 26 and the supporting circular rail 14, the stability of the rotating module in the trough body 13 and the load-bearing capacity of the main shaft 31 are increased. In addition, the rail trolleys 26 can be self-powered to assist the rotation of the main shaft 31.

[0047] The bearing frame body 23.1 of the pressure-bearing conveyor belt 23 is a closed waterproof structure. The driving roller 28 of the pressure-bearing conveyor belt 23 is connected to a single-drive motor 29 through a drive shaft 41. The driving roller 28 and the single-drive motor 29 are located at the bottom of the bearing frame body 23.1 and are installed outside the bottom surface of the trough body 13, so as not to be affected by the liquid environment or the mud bed in the trough body 13.

[0048] A plurality of vibration motors 30 are installed on the outer bottom surface of the trough body 13.

[0049] An outlet 18 is arranged at the center of the bottom of the trough body 13. An openable and closable outlet gate plate 19 is arranged at the outlet 18; a curing block conveyor belt 12 is arranged below the outlet 18, and a pair of alignment clamping plates 43 are arranged at the blanking position of the curing block conveyor belt 12.

[0050] The present invention adopts a wet process, namely chelating agent dissolution → fly ash mixing → stirring reaction (pretreatment) → fly ash sedimentation (solid-liquid separation) → die pressing → curing → output. In the curing and forming curing yard, the chelating agent solution is mixed with fly ash for pretreatment. The chelating agent (such as organic sulfide, phosphate, etc.) reacts with heavy metal elements in the fly ash to form stable compounds, so as to reduce the environmental hazard degree. The fly ash after the reaction sediments at the bottom of the tank to form a mud bed, and the solution floats on the upper layer of the tank. The solution on the upper layer of the tank is extracted and transferred to the solution buffer water tank. Then, the fly ash mud bed at the bottom is subjected to die pressing and curing. The formed fly ash cured blocks are output through the discharge port at the bottom of the tank for subsequent packing and landfill or other treatments.

[0051] The specific process is as follows:

[0052] Dissolve the chelating agent: The chelating agent is added through the chelating agent preparation tank 4 and formulated into a solution. The solution enters the premixing cylinder 2 through the chelating agent delivery pipe 11 and the premixing cylinder inlet pipe 6.

[0053] Mix the fly ash: The fly ash enters the premixing cylinder 2 through the pneumatic conveying fly ash feed pipe 8. After the chelating agent and the fly ash enter the premixing cylinder 2, a swirling flow is spontaneously formed above the stratified uniform flow ring plate 33, avoiding the direct sedimentation of the fly ash to the bottom of the premixing cylinder 2, resulting in insufficient mixing and reaction.

[0054] Stirring reaction: The stirring direction of the stirring blade 32 is opposite to the swirling flow direction, thereby increasing the fluid chaos in the premixing cylinder 2, enabling the chelating agent and the fly ash to be fully mixed and facilitating the full progress of the reaction. The premixing cylinder 2 is a fully enclosed structure, which can prevent the escape of fly ash dust. The excess gas generated by the pneumatic output is depressurized through the gas filter 5 at the top of the premixing cylinder 2.

[0055] Fly ash sedimentation (solid-liquid separation): The mixed liquid in the premixing cylinder 2 enters the flow channel in the liquid distribution arm 16 through the liquid guiding hole 34 of the main shaft 31, and then is dispersed into the tank body 13 through a number of liquid distribution holes 35 at the bottom of the liquid distribution arm 16 (during the process, the main shaft 31 drives the liquid distribution arm 16 to rotate). The fly ash quickly settles to the bottom of the tank body 13 to form a mud bed. During this process, the scraper 20 continuously scrapes the mud bed, so that the fly ash mud bed on the surface of the fan-shaped partition 22 falls onto the pressure-bearing conveyor belt 23 (inside the fly ash curing channel). The solution then converges to the central position of the tank body 13. The liftable liquid extraction pipe 7 extracts the solution in the center of the tank body 13 and transfers it to the solution buffer water tank 3 through the water tank inlet pipe 9. When the next round of pretreatment is carried out, the solution in the solution buffer water tank 3 passes through the water tank outlet pipe 10, supplements the chelating agent through the chelating agent preparation tank 4, and then enters the premixing cylinder 2 through the chelating agent delivery pipe 11 and the premixing cylinder inlet pipe 6, reacts with the newly entered fly ash for pretreatment, and is then input into the tank body 13 of the curing and forming maintenance yard, so as to realize resource recycling (circulating water utilization rate > 75%), and reduce waste liquid discharge (even no waste liquid discharge, and the solution buffer water tank 3 is replenished with water once after a round of fly ash curing), meeting the environmental protection emission standards.

[0056] Press molding: When the press molding device 15 rotates to the upper part of a fly ash curing channel, the press molding electric cylinder 38 performs an action once (the press molding electric cylinder 38 can receive power through the ring rail 14 to avoid messy on-site lines), driving the press plate 39 to press down once. A plurality of forming partition plates 40 are provided at the bottom of the press plate 39, and the downward pressing for forming and the split cutting are carried out synchronously. The stepping angle of the main shaft 31 can be controlled by a travel control switch or by setting a program, so that the press molding device 15 stops rotating when it rotates to the upper part of the fly ash curing channel, and rotates again after the downward pressing for forming is completed.

[0057] Curing: The electric heating coil in the fan-shaped partition 22 heats the formed fly ash mud block in the fly ash curing channel (it is necessary to control the heating rate and amplitude to prevent the fly ash mud block from cracking), and after standing for a period of time, a stable block is formed after the water evaporates.

[0058] Output: The vibration motor 30 on the outer bottom surface of the tank body 13 is started, so that the fly ash curing block is separated from the side wall of the fan-shaped partition 22, the press molding gate plate 21 descends, the discharge gate plate 19 is opened, and the pressure-bearing conveyor belt 23 is started to convey the fly ash curing block on it to the center of the tank body 13. The fly ash curing block is output through the central annular chute 17 and the discharge port 18 and falls onto the curing block conveyor belt 12. A pair of alignment clamping plates 43 driven by a clamping cylinder 42 are provided at the material dropping position of the curing block conveyor belt 12, which can clamp and align the falling fly ash curing block for subsequent placement, stacking and packing.

[0059] The pretreatment, solidification molding, and curing of fly ash in the present invention are all integrated in the solidification molding and curing yard, with high processing efficiency and large single - batch processing capacity, being suitable for the centralized and large - scale treatment of industrial fly ash. The present invention can achieve resource recycling (circulating water utilization rate > 75%), reduce waste liquid discharge, and even achieve zero waste liquid discharge. Moreover, it can prevent the liquid seeping out during the previous curing process from leaking into the ground and causing pollution, thus meeting the environmental protection discharge standards.

[0060] The above content is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples either. Equivalent changes and improvements made by those of ordinary skill in the art within the essence of the present invention shall fall within the scope covered by the patent of the present invention.

Claims

1. An industrial fly ash pretreatment and curing compression molding system, characterized in that: The invention comprises a solidification and shaping curing yard (1), a solution buffer water tank (3) and a chelating agent preparation tank (4) which are connected by pipeline circulation. The solidification and shaping curing yard (1) comprises a disc-shaped tank body (13). A suspended premixing cylinder (2) is arranged in the center of the tank body (13). The premixing cylinder (2) is connected to a premixing cylinder liquid inlet pipe (6) and a pneumatic conveying fly ash feed pipe (8). The premixing cylinder (2) is a fully enclosed structure. A gas filter (5) which is connected to the outside atmosphere is arranged on the top of the premixing cylinder (2). A vertical main shaft (31) is also provided in the center of the tank body (13). 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 main shaft (31) is circumferentially connected with a radially distributed compression molding device (15), a liquid distribution arm (16) and a scraper (20). The liquid distribution arm (16) is provided with a flow channel along its length direction. The bottom surface of the liquid distribution arm (16) is provided with a plurality of liquid distribution holes (35) connected to the flow channel. The main shaft (31) is circumferentially provided with a plurality of liquid guide holes (34). The portion of the main shaft (31) located below the liquid guide holes (34) is a hollow structure. The liquid guide holes (34) are connected to the flow channel in the liquid distribution arm (16) through the main shaft (31). The bottom of the trough body (13) is provided with a plurality of radially distributed pressure conveyor belts (23), adjacent pressure conveyor belts (23) are separated by fan-shaped partitions (22), and 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 compression molding device (15) is adapted to the width of the fly ash solidification channels; A discharge port (18) is provided at the center of the bottom of the tank body (13), and the discharge port (18) is provided with a discharge gate (19) that can be opened and closed.

2. The industrial fly ash pretreatment and curing molding system according to claim 1, characterized in that: The premixing barrel (2) is fixed to the bottom surface of the top crossbeam (24) of the tank body (13); the premixing barrel liquid inlet pipe (6) and the pneumatic conveying fly ash feed pipe (8) are connected to the side wall of the premixing barrel (2) and are centrally symmetrically distributed with respect to the axis of the premixing barrel (2); the feeding directions of the premixing barrel liquid inlet pipe (6) and the pneumatic conveying fly ash feed pipe (8) are both along the tangent direction of the side wall of the premixing barrel (2), so that the chelating agent and fly ash spontaneously form a vortex after entering the premixing barrel (2).

3. The industrial fly ash pretreatment and curing compression molding system according to claim 2, characterized in that: The part of the main shaft (31) located inside the premixing cylinder (2) is provided with stirring blades (32), and the stirring direction is opposite to the swirl direction.

4. The industrial fly ash pretreatment and curing compression molding system according to claim 1, characterized in that: One end of the die forming device (15), the liquid distributing 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 circle of ring rails (14) is arranged along the inner wall of the tank body (13), and the track trolley (26) is located on the ring rail (14) and can move along the ring rail (14).

5. The industrial fly ash pretreatment and curing compression 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 driving roller (28) of the pressure conveyor belt (23) is connected to the single-transmission motor (29) via a driving shaft (41). The driving roller (28) and the single-transmission motor (29) are located at the bottom of the bearing frame (23.1) and are installed outside the bottom surface of the trough body (13).

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

7. The industrial fly ash pretreatment and curing compression molding system according to claim 6, characterized in that: At the bottom of the trough body (13), a liftable compression molded gate plate (21) is provided at the end of the fly ash solidification channel, and the width of the compression molded gate plate (21) is adapted to the width of the fly ash solidification channel.

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

9. The industrial fly ash pretreatment and curing compression molding system according to claim 1, characterized in that: A plurality of vibration motors (30) are installed on the outer bottom surface of the tank body (13).

10. The industrial fly ash pretreatment and curing compression 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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