Waste sand regeneration device with low acid value consumption and regeneration method

Abstract

The invention relates to the technical field of casting, in particular to a waste sand regeneration device with low acid value consumption and a regeneration method, and the regeneration device comprises a box body, a water inlet pipe, a hopper, a sand water driving unit, a steam unit and an ultrasonic unit. According to the regeneration method, quantitative water and waste sand are injected, inert films and residues on the surface of the waste sand are effectively removed through the synergistic effect of disordered turning, high-temperature steam injection and ultrasonic oscillation, and high-quality regeneration of the waste sand is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a waste sand regeneration device and a regeneration method with a low acid consumption value. Background Art

[0002] In the foundry industry, molding sand is a key material for mold forming. Its quality and performance directly affect the quality and production efficiency of castings. With the development of casting technology and the improvement of environmental protection requirements, the recycling of molding sand has become the focus of the industry. Among them, the acid consumption value is an important indicator to measure the alkalinity of molding sand particles. The higher the acid consumption, the greater the alkalinity of the sand particles, that is, the more alkaline substances are contained in the sand particles. Since the curing agent reacts with the alkaline substances on the surface of the sand particles during the sand mixing process after being added, when using molding sand with a high acid consumption value, not only the resin consumption is high, but also the hardening speed of the mold or core is slowed down. Therefore, for regenerated sand, the acid consumption value is usually used to evaluate the quality and regeneration effect of regenerated sand. The acid consumption value of the original sand is about 4. The closer the acid consumption value of the regenerated sand is to this value, the better the regeneration quality.

[0003] The Chinese invention patent with publication number CN108326231A discloses a waste sand regeneration method for reducing the acid consumption value of regenerated sand, and the steps include: 1. Waste sand crushing: crushing the waste sand into fine sand; 2. Roasting: placing the fine sand in a roasting furnace, first roasting at 340-360°C for 50-70min, and then roasting at 640-660°C for 50-70min; 3. Wet stirring regeneration: stirring the fine sand roasted in step 2 in a wet stirring tank containing a dilute acid solution; then the mixture of the fine sand and the dilute acid solution enters a sand-water separator for sand-water separation, and the separated fine sand is dried at 240-260°C for 70-90min; 4. Grinding: grinding the fine sand dried in step 3 with a grinder for 10-30min; 5. Air separation and magnetic separation: removing sand and dust below 200 mesh from the fine sand ground in step 4 by air separation, and removing the magnetic material therein by magnetic separation. Although this patent provides a technical solution to reduce the acid consumption of regenerated sand, it also has potential defects: ① The roasting step in this method needs to be carried out in two different temperature ranges, which may lead to higher energy consumption. ② The use of dilute acid solution may have a certain impact on the environment, and environmentally friendly treatment of wastewater treatment and chemical agents needs to be considered. ③ After high-temperature roasting and grinding, the shape and particle size of the sand particles may change, affecting their performance in the casting process. ④ Because it involves multiple steps, the entire regeneration process is relatively long, affecting the regeneration efficiency. Summary of the invention

[0004] In order to overcome the problems of low processing efficiency, high cost, great environmental impact and influence on the shape and particle size of sand particles in the existing molding sand regeneration technology or one of the above problems, a waste sand regeneration device with low acid consumption value is provided. The technical solution adopted is: A waste sand regeneration device with low acid consumption value comprises a box body, a water inlet pipe for injecting or replenishing water into the box body, and a hopper for distributing waste sand into the box body. Different from the prior art, it also comprises A sand and water driving unit, comprising a sand pump, wherein the inlet of the sand pump is connected to the water and sand outlet arranged at the left end of the bottom wall of the box body through a pipeline, and the outlet of the sand pump is connected to the water and sand inlet arranged near the top of the right end of the box body through a pipeline; The steam unit comprises a U-shaped steam main pipe installed on the upper end of the left side wall of the box body, and the two ends of the steam main pipe are connected to the waste heat boiler through flanges; the upper ends of a plurality of steam branch pipes are fixedly connected to the steam main pipe and communicated with the steam main pipe, the lower ends of the steam branch pipes are closed and close to the bottom wall of the box body, and a plurality of steam nozzles are evenly arranged on the steam branch pipes; The ultrasonic unit includes a plurality of ultrasonic vibrators installed on the bottom wall of the box.

[0005] Furthermore, it also includes a discharging unit, which includes a sand pump. A first valve is arranged on the pipeline between the outlet of the sand pump and the water-sand inlet. The outlet of the sand pump is also connected to a second valve through a tee. The second valve is connected to the feed port of the hydrocyclone through a pipeline. The sand conveying pipe connected to the sand settling port of the hydrocyclone faces the sand storage yard.

[0006] Furthermore, a set volume / overflow port is opened on the top of the box body, and the set volume / overflow port guides the overflow into the sand storage yard through a pipeline.

[0007] Furthermore, a sewage outlet is provided on the bottom wall of the box body, and after the discharge is completed, the broken sand, flaked dirt and inert film deposited on the bottom of the box body are discharged along with a part of the sewage through the sewage outlet, and the clarified water on the upper layer is retained.

[0008] Furthermore, it also includes a water recovery unit, which includes a first return pipe and a second return pipe arranged on the top of the box body, the first return pipe is connected to the overflow port of the hydrocyclone; the sand pile is paved with permeable bricks and a water collection tank is opened, the water in the sand pile passes through the permeable bricks and is collected in the water collection tank, and the water pump pumps the water in the water collection tank back to the box body through the second return pipe.

[0009] Furthermore, it also includes a drying unit, which includes a rotary drum dryer, and the waste heat of the furnace is introduced into the drum dryer; the regenerated sand piled in the sand yard is transferred to the rotary drum dryer for rapid drying when it is not naturally dried.

[0010] Furthermore, the bottom wall of the box body comprises a slope which gradually rises from left to right, the ultrasonic unit is installed on the slope, and the water-sand outlet is located in a non-slope section.

[0011] Furthermore, a box cover is provided on the upper end of the box body.

[0012] The present invention also provides a waste sand regeneration method with low acid consumption value, comprising the following steps: S1. Inject a certain amount of water and a certain amount of waste sand to be regenerated into a container; S2. Drive the water and waste sand to tumble disorderly in the container for 0.5-2h, and the sand particles of the waste sand collide with each other to cause the inert film on its surface to fall off; S3. At the same time as step S2, high-temperature steam is sprayed into the sand-water suspension to increase the turbulence of the sand-water suspension, increase the temperature of the sand-water suspension, increase the kinetic energy of water molecules, increase the osmotic effect, and release the potential energy of the steam bubble rupture to generate impact force; S4. At the same time as steps S2 and S3, the water and waste sand are vibrated at high frequency in the container by an ultrasonic oscillator to increase the turbulence of the sand-water suspension, increase the kinetic energy of the waste sand, generate cavitation, and shatter the inert film on the surface of the sand; S5. Separate sand and water to obtain regenerated sand.

[0013] Furthermore, the water obtained by sand-water separation in step S5 flows back into step S1.

[0014] Compared with the prior art, the low acid consumption waste sand regeneration device and method of the present invention has the following beneficial technical effects: 1. Improve cleaning efficiency: Through the circulation of the sand and water drive unit, the high-frequency vibration of the ultrasonic unit and the thermal effect of the steam unit, the three synergistically enhance the cleaning effect of the waste sand surface and effectively remove the residue and inert film on the sand particles.

[0015] 2. Reduce energy consumption: The high energy consumption roasting step in the traditional method is avoided, and the steam and ultrasonic cleaning provided by the waste heat boiler are used to reduce energy consumption.

[0016] 3. Reduce chemical pollution: The use of dilute acid solution is abandoned, which reduces the risk of chemical pollution to the environment and alleviates the burden of wastewater treatment.

[0017] 4. Protect the integrity of sand grains: It avoids the change of sand shape and particle size caused by high temperature roasting, maintains the physical properties of sand, and is conducive to improving 5. Shorten the regeneration cycle: The integrated device design and synergistic cleaning mechanism shorten the regeneration time of waste sand and improve production efficiency.

[0018] 6. Ease of operation: The design of the device simplifies the operating process, facilitates automatic control, and reduces the need for manual operation and monitoring.

[0019] 7. Reduce equipment costs and maintenance costs: Compared with traditional regeneration equipment with multiple steps, the device of the present invention has a more compact structure, which may reduce equipment cost and maintenance expenses.

[0020] 8. Improve system stability and reliability: The integrated unit design reduces the interference of external factors on the cleaning process and improves the stability and reliability of the entire system.

[0021] 9. Enhance environmental friendliness: It abandons the use of chemical agents and reduces wastewater discharge, which is in line with the current trend of environmental protection and sustainable development.

[0022] 10. Improve economic efficiency: The economic benefits of the foundry are improved by improving the quality of regenerated sand and reducing production costs.

[0023] 11. Promote resource recycling: Effective waste sand regeneration technology helps to improve the recycling rate of resources and reduce the demand for new sand resources.

[0024] In summary, the present invention provides an efficient, energy-saving and environmentally friendly waste sand regeneration solution through an innovative collaborative cleaning mechanism, which helps to promote the transformation of the foundry industry towards green manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the waste sand regeneration device of the present invention.

[0026] Figure 2 yes Figure 1 sectional view of .

[0027] Numbers in the figure: box body -100, water inlet pipe -101, hopper -102, water sand outlet -103, water sand inlet -104, constant volume / overflow port -105; ultrasonic unit -200, ultrasonic vibrator -201; steam unit -300, steam main pipe -301, steam branch pipe -302; sand and water drive unit -400, sand pump -401; discharge unit -500, first valve -501, three-way -503, second valve -502, hydrocyclone -504, sand conveying pipe -505, sand storage field -506; water recovery unit -600, sewage outlet, water recovery unit -600, first return water pipe -601, second return water pipe -602, water collection tank -603, water pump -604. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] like Figure 1-2The waste sand regeneration device with low acid consumption value shown in the figure comprises a box body 100, a water inlet pipe 101 for injecting or replenishing water into the box body 100, a hopper 102 for distributing waste sand into the box body 100, and also comprises a sand and water driving unit 400, a steam unit 300 and an ultrasonic unit 200; the sand and water driving unit 400 comprises a sand pump 401, the inlet of the sand pump 401 is connected to a water sand outlet 103 arranged at the left end of the bottom wall of the box body 100 through a pipeline, and the outlet of the sand pump 401 is connected to a water sand inlet 103 arranged near the top of the right end of the box body 100. 04 are connected by pipelines; the steam unit 300 includes a U-shaped steam main pipe 301 installed on the upper end of the left side wall of the box body 100, and the two ends of the steam main pipe 301 are connected to the waste heat boiler through flanges; the upper ends of multiple steam branches 302 are fixedly connected to the steam main pipe 301 and communicate with it, the lower ends of the steam branches 302 are closed and close to the bottom wall of the box body 100, and multiple steam nozzles are evenly opened on the steam branches 302; the ultrasonic unit 200 includes multiple ultrasonic vibrators 201 installed on the bottom wall of the box body 100. The sand pump 401 is a pump for conveying slurry or mud containing solid particles, which is commonly used in mining, construction, metallurgy, petrochemical, river dredging, sugar making, textile and papermaking industries. The sand pump is designed to handle liquids containing higher concentrations of solid particles, suitable for conveying media containing solid particles, and can work reliably even under harsh working conditions.

[0031] The synergistic mechanism of the sand-water drive unit, steam unit and ultrasonic unit plays a key role in the waste sand regeneration process. The following is a detailed description of their respective functions and synergistic mechanisms: Function and mechanism of sand and water drive unit 400: The sand and water driving unit realizes the circulation of water and waste sand in the box 100 through the sand pump 401. The inlet of the sand pump 401 is connected to the water and sand outlet 103, and the outlet is connected to the water and sand inlet 104, forming a closed circulation loop. The circulating water flow drives the waste sand particles to form disordered tumbling in the box, increasing the collision between the sand particles and promoting the shedding of impurities and inert films attached to the surface of the sand particles.

[0032] Function and mechanism of steam unit 300: The steam unit introduces high-temperature steam into the box through the steam main pipe 301, which is in direct contact with the water-sand mixture. The multiple steam nozzles arranged on the steam branch pipe 302 spray steam evenly, increase the turbulence of the mixture, and increase the temperature of the mixture. The injection of high-temperature steam helps to increase the kinetic energy of water molecules, accelerate the penetration, and make it easier to peel off the adhesion in the waste sand. The steam bubbles rise and burst in the box, releasing potential energy, generating impact force on the surface of the waste sand particles, and further promoting the removal of impurities. The steam branch pipe 302 not only serves as a carrier of steam, but also a spoiler. The design and layout of the steam branch pipe 302 can optimize the steam injection method to generate stronger turbulence in the box. This turbulence helps to break up the aggregation of waste sand particles and improve their contact efficiency with the vibration generated by steam and ultrasonic vibrator 201.

[0033] Function and mechanism of ultrasonic unit 200: The ultrasonic unit generates high-frequency vibrations through the ultrasonic vibrator 201 installed on the bottom wall of the box. Ultrasonic waves propagate in the water medium, driving the water and waste sand to generate high-frequency vibrations in the container, increasing the turbulence of the sand-water suspension and the kinetic energy of the waste sand particles; at the same time, pressure waves are generated to form a cavitation effect in the water, generating tiny bubbles. These bubbles grow rapidly on the surface of the waste sand particles and suddenly close, generating strong micro-jets and impact forces, breaking the dirt and inert film on the surface of the sand particles; the mechanical action of the ultrasonic waves increases the kinetic energy of the sand particles, improving the collision probability and efficiency.

[0034] The mechanism of the three synergistic effects: When the sand-water drive unit, steam unit and ultrasonic unit work simultaneously, their effects are superimposed and enhanced. The flow and tumbling provided by the sand-water drive unit provide better contact conditions for steam and ultrasonic waves. The thermal effect of steam and the mechanical vibration of ultrasonic waves act together on the waste sand particles, improving the cleaning efficiency and thoroughness. The thermal energy of high-temperature steam combined with the cavitation effect of ultrasonic waves accelerates the peeling of adherents in the waste sand and reduces the acid consumption value. This synergistic effect not only improves the cleaning efficiency, but also reduces the use of chemical cleaning agents, realizing an environmentally friendly and energy-saving waste sand regeneration process. Through this comprehensive physical cleaning method, the waste sand regeneration device can effectively remove impurities in the waste sand and restore its performance, providing an efficient and environmentally friendly waste sand regeneration solution for the foundry industry.

[0035] In another preferred embodiment, a discharge unit 500 is further included, the discharge unit 500 includes a sand pump 401, a first valve 501 is arranged on the pipeline between the outlet of the sand pump 401 and the water-sand inlet 104, the outlet of the sand pump 401 is also connected to a second valve 502 through a tee 503, the second valve 502 is connected to the feed port of the hydrocyclone 504 through a pipeline, and a sand conveying pipe 505 connected to the sand settling port of the hydrocyclone 504 faces the sand storage field 506. The sand pump 401 has a dual role, which has the role of driving the circulation and tumbling of sand and water in the sand-water driving unit 400, but at this time, it plays its conveying role, pumping the treated mixture of waste sand and water out of the box 100. The hydrocyclone 504 uses centrifugal force to separate waste sand and water. The heavier and larger sand particles, i.e., regenerated sand, are discharged through the sand settling port, while the lighter crushed sand particles, flaked dirt, inert film, and water are returned to the housing 100 through the overflow port. The hydrocyclone 504 uses centrifugal force to efficiently separate waste sand and water, ensuring that the heavier and larger sand particles, i.e., regenerated sand, are effectively separated from the lighter impurities and water. The regenerated sand is directly transported to the sand storage field 506 through the sand conveying pipe 505, which facilitates the recovery and reuse of the regenerated sand and reduces resource waste. The lighter crushed sand particles, flaked dirt, and inert film in the overflow port are returned to the housing 100 with the water, avoiding the direct discharge of these impurities into the environment and reducing pollution. The water in the overflow port flows back to the housing 100, realizing the recycling of water resources, improving the utilization efficiency of water, and saving costs. The arrangement of the first valve 501 and the second valve 502 improves the controllability of the system, so that the entire discharging process can be precisely adjusted as needed. The dual role of the sand pump 401 allows the system to adjust its functions according to different processing stages, thereby improving the adaptability and flexibility of the system. By optimizing the design of the discharging unit, the need for additional conveying equipment is reduced, thereby reducing the energy consumption of the entire system. The integrated discharging unit reduces the complexity of multi-device operation, simplifies the operating process, and improves the simplicity and safety of operation. This preferred embodiment, through the addition of the discharging unit, not only improves the efficiency and quality of waste sand regeneration, but also achieves efficient resource recovery and environmental protection, with good economic and environmental benefits.

[0036] In another preferred embodiment, a set volume / overflow port 105 is opened on the top of the box body 100, and the set volume / overflow port introduces the overflow into the sand pile 506 through a pipe. The set volume / overflow port 105 is used to control the liquid level in the box body and introduce excess water into the sand pile 506 through a pipe. In this way, each regeneration can have the same volume of water, which is also conducive to injecting a set volume of waste sand. For example, water: waste sand = 4:1. The set volume / overflow port 105 helps to standardize the regeneration process, improve the consistency of operation and the predictability of the regeneration effect. Introducing excess water into the sand pile 506 through a pipe can avoid direct discharge of water into the environment and reduce the impact on the environment. In addition, the sand in the water can be recovered. This design helps to improve the automation level of the entire waste sand regeneration device, reduce manual intervention, and improve the convenience and safety of operation.

[0037] In another preferred embodiment, a sewage outlet is also provided on the bottom wall of the box 100. After the discharge is completed, the crushed sand, flaked dirt and inert membrane sludge deposited at the bottom of the box are discharged with a part of the sewage through the sewage outlet, and then harmlessly treated by other means, so as to achieve effective separation of waste sand and impurities. The clear water in the upper layer is retained to provide clean water quality for the next regeneration process, thereby improving the reuse rate of water and reducing resource consumption.

[0038] In another preferred embodiment, a water recovery unit 600 is further included, and the water recovery unit 600 includes a first water return pipe 601 and a second water return pipe 602 arranged at the top of the box 100, and the first water return pipe 601 is connected to the overflow port of the hydrocyclone 504; the sand pile 506 is paved with permeable bricks and a water collection pool 603 is opened, and the water in the sand pile is collected in the water collection pool 603 through the permeable bricks, and the water pump 604 pumps the water in the water collection pool 603 back to the box 100 through the second water return pipe 602. Through the water recovery unit 600, the system can recycle and reuse water resources, reducing the demand for water resources; the setting of the water recovery unit 600 makes the entire waste sand regeneration system more closed, improves the self-sufficiency rate, reduces the discharge of wastewater, reduces the dependence on external water resources, saves water resource costs, is beneficial to environmental protection, and helps to improve the economic benefits of the entire waste sand regeneration system.

[0039] In another preferred embodiment, a drying unit is further included, and the drying unit includes a rotary drum dryer, and the drum dryer is introduced with waste heat from the furnace; the regenerated sand piled in the sand storage area 506 is transferred to the rotary drum dryer for rapid drying when it is not naturally dried. The rotary drum dryer can quickly dry the regenerated sand in a short time, thereby improving the efficiency of the drying process; the waste heat from the furnace is used as the heat source of the dryer, thereby achieving effective reuse of industrial waste heat and reducing energy waste. Even in humid or rainy climate conditions, the drying unit can ensure the drying of the regenerated sand and ensure the stability of production.

[0040] In another preferred embodiment, the bottom wall of the box 100 includes a slope that gradually rises from left to right, the ultrasonic unit 200 is installed on the slope, and the water-sand outlet 103 is located in the non-slope section. The slope design helps to guide the water flow and waste sand to move along the slope, so that the ultrasonic wave generated by the ultrasonic unit 200 can act on the waste sand more evenly, thereby enhancing the cleaning effect. The slope structure can cause the waste sand to roll or slide under the action of ultrasonic vibration, which helps to break up the sand particles and improve the cleaning efficiency. The existence of the slope changes the dynamic characteristics of the water flow, which may promote more effective turbulent or laminar flow, and help to improve the mixing and separation of waste sand and water. The slope provides a natural flow path for the waste sand, which facilitates the smooth flow of the cleaned waste sand to the water-sand outlet 103, thereby reducing the risk of blockage. The ultrasonic unit 200 is installed on the slope, which may be closer to the main area where the waste sand flows, so that the ultrasonic wave can act on the waste sand more directly, thereby improving the regeneration efficiency.

[0041] In another preferred embodiment, a box cover is provided on the upper end of the box body 100. The box cover provides physical isolation, prevents the mixture of water and waste sand from splashing to the outside of the box body during the operation of the equipment, causes safety risks and waste, reduces heat loss, improves energy efficiency, reduces noise generated during the operation of the equipment, and improves the working environment.

[0042] The waste sand regeneration method of a waste sand regeneration device with low acid consumption value in this embodiment can be summarized as follows: S1. Inject a certain amount of water and a certain amount of waste sand to be regenerated into a container; S2. Drive the water and waste sand to tumble disorderly in the container for 0.5-2h, and the sand particles of the waste sand collide with each other, causing the inert film on its surface to fall off; S3. At the same time as step S2, high-temperature steam is sprayed into the sand-water suspension to increase turbulence in the sand-water suspension, increase the temperature of the sand-water suspension, increase the kinetic energy of water molecules, increase osmosis, and release potential energy when steam bubbles burst, generating impact force; S4. At the same time as steps S2 and S3, the water and waste sand are vibrated at high frequency in the container by an ultrasonic oscillator to increase the turbulence of the sand-water suspension and the kinetic energy of the waste sand particles; at the same time, pressure waves are generated to form a cavitation effect in the water, generating tiny bubbles, which grow rapidly on the surface of the waste sand particles and suddenly close, generating strong microjets and impact forces, breaking the dirt and inert film on the surface of the sand particles; S5. Separate the sand and water to obtain regenerated sand. The water obtained by separating the sand and water in step S5 flows back to step S1.

[0043] The following table is the experimental data: raw sand Reclaimed sand after treatment by existing methods The regenerated sand after treatment in this embodiment Acid consumption value 4.5 8 6.2 It can be seen that the regenerated sand treated in this embodiment can effectively reduce the acid consumption value of gravel, and can reduce the acid consumption value by more than 50%. The waste sand regeneration method achieves efficient regeneration of waste sand through a series of carefully designed steps, and its excellent effects are mainly reflected in the following aspects: Improve regeneration efficiency: Through the synergistic effect of disordered tumbling, high-temperature steam injection and ultrasonic oscillation, the cleaning efficiency of the waste sand surface is greatly improved, and the removal of inert film and dirt is accelerated.

[0044] Reduced chemical dependence: This method mainly relies on physical means to clean waste sand, which reduces dependence on chemical cleaning agents and reduces the risk of chemical pollution in subsequent treatments.

[0045] Significant energy-saving effect: The use of high-temperature steam and ultrasonic oscillation improves cleaning efficiency, shortens cleaning time, and thus reduces energy consumption.

[0046] Improve water resource utilization: In step S5, the separated water is returned to step S1, thereby realizing the recycling of water resources, saving water resources and reducing wastewater discharge.

[0047] Improve the quality of regenerated sand: The surface of the waste sand after cleaning is cleaner and the acid consumption value is reduced, which improves the quality of the regenerated sand, making it closer to the performance of the original sand and meeting the requirements of the casting industry.

[0048] Easy operation and high degree of automation: The method has clear steps, is easy to operate, and can be implemented through an automated control system, which reduces manual intervention and improves the convenience and safety of operation.

[0049] Environmentally friendly: It reduces the use of chemical cleaning agents and wastewater discharge, reduces the impact on the environment, and conforms to the concept of green manufacturing and sustainable development.

[0050] Improve production efficiency: The high efficiency of the cleaning process shortens the regeneration cycle of waste sand, improves production efficiency, and speeds up the reuse of waste sand.

[0051] Reduce operating costs: By saving energy, water and reducing the use of chemical cleaning agents, the operating costs of the entire waste sand regeneration process are reduced.

[0052] Improve system stability: By precisely controlling various parameters during the cleaning process, the stability of the system and the consistency of the regeneration effect are improved.

[0053] Strong adaptability: This method is suitable for the regeneration of waste sand of different types and different degrees of pollution, and has good adaptability and flexibility.

[0054] In summary, the waste sand regeneration method of this embodiment achieves efficient, energy-saving and environmentally friendly waste sand regeneration effects through physical means, improves the quality of regenerated sand, reduces production costs, and has good industrial application prospects and economic value.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the field can make many possible changes or modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A waste sand regeneration device with low acid consumption value, comprising a box (100), a water inlet pipe (101) for injecting or replenishing water into the box (100), and a hopper (102) for distributing waste sand into the box (100), characterized in that: Also includes A sand-water driving unit (400) comprises a sand pump (401), wherein the inlet of the sand pump (401) is connected to a water-sand outlet (103) arranged at the left end of the bottom wall of the box body (100) via a pipeline, and the outlet of the sand pump (401) is connected to a water-sand inlet (104) arranged near the top of the right end of the box body (100) via a pipeline; The steam unit (300) comprises a U-shaped steam main pipe (301) installed at the upper end of the left side wall of the box body (100), and the two ends of the steam main pipe (301) are connected to the waste heat boiler through flanges; the upper ends of a plurality of steam branch pipes (302) are fixedly connected to the steam main pipe (301) and communicate with the steam main pipe (301), the lower ends of the steam branch pipes (302) are closed and close to the bottom wall of the box body (100), and a plurality of steam nozzles are evenly arranged on the steam branch pipes (302); The ultrasonic unit (200) comprises a plurality of ultrasonic vibrators (201) mounted on the bottom wall of the box (100).

2. A waste sand regeneration device with low acid consumption value according to claim 1, characterized in that: The device also comprises a discharge unit (500), the discharge unit (500) comprising a sand pump (401), a first valve (501) being arranged on a pipeline between the outlet of the sand pump (401) and the water-sand inlet (104), the outlet of the sand pump (401) being connected to a second valve (502) via a tee (503), the second valve (502) being connected to a feed port of a hydrocyclone (504) via a pipeline, and a sand conveying pipe (505) connected to a sand settling port of the hydrocyclone (504) being directed toward a sand storage area (506).

3. A waste sand regeneration device with low acid consumption value according to claim 2, characterized in that: A set volume / overflow port (105) is opened on the top of the box body (100), and the set volume / overflow port guides the overflow into the sand storage area (506) through a pipeline.

4. A waste sand regeneration device with low acid consumption value according to claim 2, characterized in that: The bottom wall of the box (100) is also provided with a sewage outlet, through which the crushed sand particles, flaked dirt and inert membrane deposited on the bottom of the box are discharged along with a portion of sewage after the discharge is completed, while the clarified water on the upper layer is retained.

5. The waste sand regeneration device with low acid consumption value according to claim 1 is characterized in that: It also includes a water recovery unit (600), the water recovery unit (600) including a first water return pipe (601) and a second water return pipe (602) arranged on the top of the box (100), the first water return pipe (601) being connected to the overflow port of the hydrocyclone (504); the sand pile (506) is paved with permeable bricks and a water collection tank (603) is provided, the water in the sand pile passes through the permeable bricks and is collected in the water collection tank (603), and the water pump (604) pumps the water in the water collection tank (603) back to the box (100) through the second water return pipe (602).

6. The waste sand regeneration device with low acid consumption value according to claim 1 is characterized in that: It also includes a drying unit, which includes a rotary drum dryer, into which waste heat from a melting furnace is introduced; when the regenerated sand piled in the sand storage area (506) is not naturally dried, it is transferred to the rotary drum dryer for rapid drying.

7. The waste sand regeneration device with low acid consumption value according to claim 1 is characterized in that: The bottom wall of the box (100) comprises a slope that gradually rises from left to right, the ultrasonic unit (200) is installed on the slope, and the water-sand outlet (103) is located in a non-slope section.

8. The waste sand regeneration device with low acid consumption value according to claim 1 is characterized in that: The upper end of the box body (100) is covered with a box cover.

9. A method for regenerating waste sand with low acid consumption value, characterized in that: The following steps are included: S1. Inject a certain amount of water and a certain amount of waste sand to be regenerated into a container; S2. Drive the water and waste sand to tumble disorderly in the container for 0.5-2h, and the sand particles of the waste sand collide with each other, causing the inert film on its surface to fall off; S3. At the same time as step S2, high-temperature steam is sprayed into the sand-water suspension to increase turbulence in the sand-water suspension, increase the temperature of the sand-water suspension, increase the kinetic energy of water molecules, increase osmosis, and release potential energy when steam bubbles burst, generating impact force; S4. At the same time as steps S2 and S3, the water and waste sand are vibrated at high frequency in the container by an ultrasonic oscillator to increase the turbulence of the sand-water suspension and the kinetic energy of the waste sand particles; at the same time, pressure waves are generated to form a cavitation effect in the water, generating tiny bubbles, which grow rapidly on the surface of the waste sand particles and suddenly close, generating strong microjets and impact forces, breaking the dirt and inert film on the surface of the sand particles; S5. Separate sand and water to obtain regenerated sand.

10. The method for regenerating waste sand with low acid consumption value according to claim 1, characterized in that: The water obtained by sand-water separation in step S5 flows back to step S1.

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