Method for using a clay-based magnesia recycled aggregate production plant

Abstract

The application discloses a clay-based magnesium regeneration aggregate production equipment use method, and the clay-based magnesium regeneration aggregate comprises the following raw materials in parts by weight: 65-85 parts of mud cake with a water content of 48-54%, 25-35 parts of cementing material, and 16-20 parts of admixture; the mud cake is transported into a crushing equipment, a control system controls the admixture to be added and crushing; after being weighed, the mud cake is transported into a stirring equipment through a bucket elevator, then a binder and an additive are sequentially added into the stirring equipment for stirring, and after iron removal through a stirring material conveying belt and an iron remover, the mud cake is conveyed into an extruding forming equipment through a distributor, is extruded and formed, and the formed clay-based magnesium regeneration aggregate is sieved through an aggregate vibrating screen, and falls into a clay-based magnesium regeneration aggregate bin. The clay-based magnesium regeneration aggregate production equipment use method can produce the clay-based magnesium regeneration aggregate by using the gelatinous solid waste with a high water content, raw materials are cheap and easy to obtain, and solid waste can be used in a large scale.

Description

Technical Field

[0001] This invention relates to the field of slag and silt utilization technology, and in particular to a method for using equipment for producing clay-based magnesium recycled aggregate. Background Technology

[0002] Compared to above-ground construction, underground construction inevitably generates a larger volume of construction waste during its construction process. How to efficiently dispose of this massive amount of construction waste remains a significant technical challenge for sustainable development in engineering construction globally. Furthermore, the volume of various types of silt generated annually from river dredging is also enormous. This silt is primarily composed of muddy, gelatinous waste with high water content, and is a large amount of solid waste that is difficult to efficiently utilize in environmental remediation and the construction of waste-free cities.

[0003] Magnesium cementitious materials are currently mainly used in the production of fireproof and high-temperature resistant products and decorative wall panels. Magnesium cementitious materials have good chemical compatibility with clay-based materials and can effectively solidify clay-based materials. However, there is currently a lack of complete production equipment and processes for the efficient resource utilization of bulk clay-based solid waste using magnesium cementitious materials. Summary of the Invention

[0004] The purpose of this invention is to address the technical challenge of lacking large-scale, non-drying production equipment and methods for producing gelatinous waste with high moisture content, and to propose a method for using equipment to produce clay-based magnesium recycled aggregate.

[0005] This invention provides a method for using equipment for producing clay-based magnesium recycled aggregate, wherein the clay-based magnesium recycled aggregate comprises the following raw materials in parts by weight: 65-85 parts of mud cake with a moisture content of 48-54%, 25-35 parts of cementitious material, and 16-20 parts of admixture; The method of use includes the following steps: S1. The mud cake with a moisture content of less than 60% is transported to the crushing equipment, and the control system controls the admixture added to the admixture bin for crushing. S2. The control system weighs the crushed mud cake and transports it to the mixing equipment via a bucket elevator. Then, the weighed mud cake is added to the mixing equipment and mixed for 3 to 25 minutes. S3. After the mixed material is passed through the mixing material conveyor belt and the iron remover to remove iron, it is then conveyed to the extrusion molding equipment by the material distributor for extrusion molding. S4. The formed clay-based magnesium recycled aggregate is vibrated and screened by an aggregate vibrating screen and falls into the clay-based magnesium recycled aggregate bin. The remaining material after vibrating and screening is conveyed to the mixing material conveyor belt by the remaining material conveyor belt. The aggregate vibrating screen includes: a screen support, an aggregate screen, a vibrating motor, a flexible support, and a flexible cover plate. The screen support is located below the roller extrusion device, the aggregate screen is located on the screen support, the vibrating motor is located above the aggregate screen, the flexible support is connected to the aggregate screen, and the flexible cover plate is connected to the flexible support. Aggregate vibrating screens are used to remove the connecting material between clay-based magnesium recycled aggregate particles and the edge material of the particles, solving the problem of easy adhesion of magnesium-based cementitious materials.

[0006] Furthermore, the cementing material is one of magnesium oxysulfate cementing material and magnesium oxychloride cementing material; The magnesium sulfate-oxygen cementitious material contains 80-100 parts of lightly calcined magnesium oxide and 40-70 parts of magnesium sulfate heptahydrate. The magnesium oxychloride cementitious material contains 80-100 parts of lightly calcined magnesium oxide, 120-150 parts of magnesium chloride hexahydrate, and 20-40 parts of darkly calcined magnesium oxide.

[0007] Furthermore, the admixture is one or more of waste ash, waste residue, and stone powder; The waste ash is waste ash from an asphalt mixing plant; the waste residue is waste residue generated during the ceramic firing process; and the stone powder is stone powder generated during the concrete crushing process.

[0008] Furthermore, the admixture silo is located above the crushing equipment, the crushing equipment is located below the mixing equipment, and the binder silo, additive silo, admixture silo, and crushing equipment are all equipped with automatic metering units. The binder silo, additive silo, and crushing equipment are respectively connected to the mixing equipment. The mixing equipment is connected to the extrusion molding equipment through a mixing material conveyor belt, and the clay-based magnesium recycled aggregate silo is located below the extrusion molding equipment.

[0009] Furthermore, the crushing equipment includes: a feeding hopper, a feed inlet, a crusher, and a discharge outlet. The feeding hopper is equipped with the automatic metering unit. The feed inlet is located at the front end of the crusher, and the discharge outlet is located at the rear end of the crusher. The discharge outlet is connected to a mixing device via a bucket elevator.

[0010] Furthermore, the iron remover and the distributor are installed on the mixing material conveyor belt. The iron remover is located between the mixing equipment and the extrusion forming equipment, and the distributor is located above the extrusion forming equipment. The iron remover includes: a rake-type rotary electromagnet, an iron scrap collector, and an iron removal controller. The rake-type rotary electromagnet is connected to the iron scrap collector, and the iron removal controller is connected to the rake-type rotary electromagnet. The lowest point of the rake-type rotary electromagnet is 5mm away from the upper surface of the mixing conveyor belt.

[0011] Furthermore, the extrusion molding equipment includes: a feed inlet, a roller extrusion device, the aggregate vibrating screen, the waste material conveyor belt, and an extrusion controller. The feed inlet is located above the roller extrusion device and is connected to the mixing equipment via a mixing material conveyor belt. The roller extrusion device is located above the aggregate vibrating screen, and the aggregate vibrating screen is located above the waste material conveyor belt. The extrusion controller is connected to the control system and the extrusion molding equipment.

[0012] Furthermore, the roller extrusion device includes: rollers, an extrusion motor, and a roller cleaning machine. The surface of each roller is provided with several hemispherical grooves. The rollers are connected to the extrusion motor, and the roller cleaning machine is connected to the extrusion controller. The roller cleaning machine is located above the rollers.

[0013] Furthermore, the extrusion molding equipment is provided in 5 units: 2 units with hemispherical groove diameters of 10mm, 2 units with hemispherical groove diameters of 20mm, and 1 unit with hemispherical groove diameters of 30mm, 20mm, and 10mm, arranged in order of distance from the mixing equipment from closest to furthest.

[0014] Furthermore, the method of use also includes: step S4, after the mixing material on the mixing conveyor belt is produced, the control system controls the roller cleaning machine to clean the rollers.

[0015] This invention enables high-value-added resource utilization of mud-like waste with high moisture content. It manufactures clay-based magnesium recycled aggregate from mud-like waste with a moisture content of less than 60%, effectively solving the engineering, social, and ecological governance problems of high cost, ecological damage, and unsustainable development caused by the treatment of gelatinous solid waste with high moisture content. This invention does not require drying equipment, reduces energy consumption, and has low cost. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the usage method of a clay-based magnesium recycled aggregate production equipment.

[0017] Figure 2 This is a top view of the plan layout of a clay-based magnesium recycled aggregate production equipment.

[0018] Figure 3 This is a front view of the plan layout of a clay-based magnesium recycled aggregate production equipment.

[0019] Figure 4 Right view of the plan layout of a clay-based magnesium recycled aggregate production equipment.

[0020] Figure 5 This is a schematic diagram of an iron remover in a clay-based magnesium recycled aggregate production equipment.

[0021] Figure 6This is a schematic diagram of an extrusion molding device for producing clay-based magnesium recycled aggregate.

[0022] Figure 7 This is a schematic diagram of an aggregate vibrating screen for a clay-based magnesium recycled aggregate production equipment.

[0023] Figure 8 This is a schematic diagram of a clay-based magnesium recycled aggregate.

[0024] In the diagram: 1. Binder silo; 2. Additive silo; 3. Admixture silo; 4. Crushing equipment; 5. Mixing equipment; 6. Mixed material conveyor belt; 7. Extrusion molding equipment; 8. Clay-based magnesium recycled aggregate silo; 9. Automatic metering unit; 10. Control system; 11. Control room; 12. Feed hopper; 13. Inlet; 14. Crusher; 15. Outlet; 16. Bucket elevator; 17. Magnetic separator; 18. Distributor. 19. Rake-type rotary electromagnet; 20. Iron scrap collector; 21. Iron removal controller; 22. Feed inlet; 23. Double roller extrusion device; 24. Aggregate vibrating screen; 25. Waste material conveyor belt; 26. Extrusion controller; 27. Double rollers; 28. Extrusion motor; 29. ​​Roller cleaning machine; 30. Hemispherical groove; 31. Screen support; 32. Aggregate screen; 33. Vibrating motor; 34. Flexible support; 35. Flexible cover plate. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0027] The present invention relates to a method for using equipment for producing clay-based magnesium recycled aggregate, wherein the clay-based magnesium recycled aggregate comprises the following raw materials in parts by weight: The mixture consists of 65-85 parts mud cake with a moisture content of 48-54%, 25-35 parts cementitious material, and 16-20 parts admixture.

[0028] Specifically, the cementing material is one of magnesium oxysulfate cementing material and magnesium oxychloride cementing material; The magnesium sulfate-oxygen cementitious material contains 80-100 parts of lightly calcined magnesium oxide and 40-70 parts of magnesium sulfate heptahydrate. The magnesium oxychloride cementitious material contains 80-100 parts of lightly calcined magnesium oxide, 120-150 parts of magnesium chloride hexahydrate, and 20-40 parts of darkly calcined magnesium oxide.

[0029] like Figure 1 As shown, the usage method includes the following steps: S1. The mud cake with a moisture content of less than 60% is transported to the crushing equipment 4, and the control system 10 controls the admixture added to the admixture bin 3 for crushing. S2. The control system 10 weighs the crushed mud cake and transports it to the mixing equipment 5 through the bucket elevator 16. Then, the weighed mud cake is added to the mixing equipment 5 and mixed for 3 to 25 minutes. S3. After the mixed material is removed from iron by the mixing material conveyor belt 6 and the iron remover 17, it is conveyed to the extrusion molding equipment 7 by the distributor 18 and extruded into shape. S4. The formed clay-based magnesium recycled aggregate is vibrated and screened by aggregate vibrating screen 24 and falls into clay-based magnesium recycled aggregate bin 8. The remaining material after vibrating screening is conveyed to the mixing material conveyor belt 6 by the remaining material conveyor belt 25. The aggregate vibrating screen includes: a screen support, an aggregate screen, a vibrating motor, a flexible support, and a flexible cover plate. The screen support is located below the roller extrusion device, the aggregate screen is located on the screen support, the vibrating motor is located above the aggregate screen, the flexible support is connected to the aggregate screen, and the flexible cover plate is connected to the flexible support. like Figure 7 As shown, the aggregate vibrating screen 24 includes: a screen support 31, an aggregate screen 32, a vibrating motor 33, a flexible support 34, and a flexible cover plate 35. The screen support 31 is located below the roller extrusion device 23, the aggregate screen 32 is located on the screen support 31, the vibrating motor 33 is located above the aggregate screen 32, the flexible support 34 is connected to the aggregate screen 32, and the flexible cover plate 35 is connected to the flexible support 34. The aggregate vibrating screen 24 effectively removes the connecting material and edge material between clay-based magnesium recycled aggregate particles, and separates these connecting materials, edge material, and other unformed mixtures. The separated mixtures are then conveyed to the extrusion molding equipment 7 via the residual material conveyor belt 25 for further extrusion into clay-based magnesium recycled aggregate. This improves the appearance quality of the clay-based magnesium recycled aggregate particles and the utilization rate of the mixture. It also effectively avoids the bridging and bonding effect of unformed mixtures on the clay-based magnesium recycled aggregate, which makes it difficult to disperse after entering the clay-based magnesium recycled aggregate bin 8. At the same time, it eliminates the influence of connecting materials, edge material, and other unformed mixtures between clay-based magnesium recycled aggregate particles on the test results of the compressive strength and crushing index of the clay-based magnesium recycled aggregate.

[0030] The extruded aggregate has the following shape: Figure 8The granules shown are spherical.

[0031] The clay-based magnesium recycled aggregate production equipment includes: a binder silo 1, an additive silo 2, an admixture silo 3, a crushing device 4, a mixing device 5, a mixing conveyor belt 6, an extrusion molding device 7, a clay-based magnesium recycled aggregate silo 8, an automatic metering unit 9, a control system 10, and a control room 11. The binder silo 1 and the additive silo 2 are located above the mixing device 5, the admixture silo 3 is located above the crushing device 4, and the crushing device 4 is located below the mixing device 5. The automatic metering unit 9 is installed in each of the binder silo 1, the additive silo 2, the admixture silo 3, and the crushing device 4. The binder silo 1, the additive silo 2, and the crushing device 4 are respectively connected to the mixing device 5. The mixing device 5 is connected to the extrusion molding device 7 via the mixing conveyor belt 6. The clay-based magnesium recycled aggregate silo 8 is located below the extrusion molding device 7. The control system 10 is located in the control room 11.

[0032] The clay-based magnesium recycled aggregate production equipment of the present invention can crush mud cake with a moisture content of less than 60% after adding admixtures, add and stir, and produce clay-based magnesium recycled aggregate that meets engineering requirements through extrusion molding equipment 7. It significantly improves the added value of resource utilization of colloidal waste with high moisture content, provides a technical solution for the high-quality development of related industries of colloidal waste with high moisture content, and effectively provides a new type of recycled aggregate for engineering construction, promoting the development of new quality productivity in the construction industry.

[0033] Optionally, the admixture is one or more of waste ash, waste residue, and stone powder; The waste ash is waste ash from an asphalt mixing plant; the waste residue is waste residue generated during the ceramic firing process; and the stone powder is stone powder generated during the concrete crushing process.

[0034] Specifically, the admixture is a powder with a particle size of 0.07-0.08 mm.

[0035] Optional, such as Figure 3 As shown, the crushing equipment 4 includes: a feeding hopper 12, a feed inlet 13, a crusher 14, and a discharge outlet 15. The feeding hopper 12 is equipped with an automatic metering unit 9. The feed inlet 13 is located at the front end of the crusher 14, and the discharge outlet 15 is located at the rear end of the crusher 14. The discharge outlet 15 is connected to the mixing equipment 5 via a bucket elevator 16. By adding admixtures before crushing the mud cake, the water absorption of the admixtures effectively solves the technical problem of easy clumping after crushing mud cakes with high moisture content. At the same time, it achieves preliminary mixing of the mud cake and the admixtures, ensuring thorough mixing of the mixture before molding the clay-based magnesium recycled aggregate.

[0036] Optional, such as Figure 4 and Figure 5As shown, an iron remover 17 and a distributor 18 are installed on the mixing conveyor belt 6. The iron remover 17 is located on the mixing conveyor belt 6 between the mixing equipment 5 and the extrusion forming equipment 7. The distributor 18 is located above the extrusion forming equipment 7. The iron remover 17 includes: a rake-type rotary electromagnet 19, an iron scrap collector 20, and an iron removal controller 21. The rake-type rotary electromagnet 19 is connected to the iron scrap collector 20, and the iron removal controller 21 is connected to the rake-type rotary electromagnet 19. The lowest point of the rake-type rotary electromagnet 19 is 5 mm away from the upper surface of the mixing conveyor belt 6. When the rake tip of the rake-type rotating electromagnet 19 of the iron separator 17 rotates to a distance of 650mm from the conveyor belt of the mixed material, the rake-type rotating electromagnet 19 is energized. When the rake tip of the rake-type rotating electromagnet 19 of the iron separator 17 rotates to a distance of 2050mm from the scrap collector, the rake-type rotating electromagnet 19 is de-energized. By energizing and de-energizing the rake-type rotating electromagnet 19 of the iron separator 17, the scrap in the mixed material is effectively removed and recycled to the scrap collector 20, avoiding damage to the rollers of the extrusion molding equipment 7 by the scrap mixed in the mixed material, and ensuring the molding quality of clay-based magnesium recycled aggregate.

[0037] Optional, such as Figure 6 As shown, the extrusion molding equipment 7 includes: a feed inlet 22, a roller extrusion device 23, an aggregate vibrating screen 24, a waste material conveyor belt 25, and an extrusion controller 26. The feed inlet 22 is located above the roller extrusion device 23 and is connected to the mixing equipment 5 via the mixing material conveyor belt 6. The roller extrusion device 23 is located above the aggregate vibrating screen 24, which is located above the waste material conveyor belt 25. The extrusion controller 26 is connected to the control system 10 and the extrusion molding equipment 7 and is located beside the extrusion molding equipment 7. By extruding the mixing material into clay-based magnesium recycled aggregate through the extrusion molding equipment 7, large-scale production of colloidal waste with high moisture content without drying is realized, providing production equipment support for sustainable development and the construction of waste-free cities.

[0038] Optional, such as Figure 7 As shown, the roller extrusion device 23 includes: rollers 27, an extrusion motor 28, and a roller cleaning machine 29. The rollers 27 have several hemispherical grooves 30 on their surfaces. The rollers 27 are connected to the extrusion motor 28, and the roller cleaning machine 29 is connected to the extrusion controller 26. The roller cleaning machine 29 is located above the rollers 27. By providing hemispherical grooves 30 on the surface of the rollers 27, the mixture of gelatinous waste with high moisture content is extruded into ellipsoidal clay-based magnesium recycled aggregate. This allows the clay-based magnesium recycled aggregate to be tightly bonded together through physical action before molding, reducing the porosity of the clay-based magnesium recycled aggregate and ensuring the uniform and complete particle shape of the clay-based magnesium recycled aggregate, effectively promoting the strength increase of the clay-based magnesium recycled aggregate.

[0039] Optional, such as Figure 2 and Figure 3 As shown, five extrusion molding devices 7 are provided: two with roller groove diameters of 10mm, two with 20mm, and one with 30mm. These devices are arranged in order of distance from the mixing device 5, from closest to furthest. By using extrusion molding devices 7 with different particle sizes, the needs for different applications regarding the particle size of clay-based magnesium recycled aggregates can be met. Furthermore, placing larger-sized extrusion molding devices 7 closest to the mixing device 5 facilitates the extrusion of the remaining material conveyed by the remaining material conveyor belt 25 into larger-sized clay-based magnesium recycled aggregates first, and then into smaller-sized clay-based magnesium recycled aggregates.

[0040] Optionally, the extrusion molding equipment 7 can be controlled by the extrusion controller 26 through the control system 10, or it can be controlled independently by the extrusion controller 26.

[0041] Optionally, the produced clay-based magnesium recycled aggregate has a 28-day compressive strength greater than 2 MPa and a 28-day crushing index less than 30%.

[0042] By developing a clay-based magnesium recycled aggregate production equipment and method, clay-based magnesium recycled aggregate that does not require drying can be produced on a large scale. This effectively solves the technical problem of resource utilization of colloidal waste with high moisture content and realizes high-value-added resource utilization of colloidal waste with high moisture content. It provides a valuable industrial technology solution for the high-quality development of industries related to colloidal waste with high moisture content and the development of new productive forces.

[0043] Example 1 like Figure 2 and Figure 8 As shown, 68.6 parts of mud cake with a moisture content of 53% and 18 parts of asphalt mixing plant waste ash with a particle size of 0.074mm were added to the crushing equipment 4. The crushed material was then lifted to the mixing equipment 5 by the bucket elevator 16. At the same time, 31.4 parts of magnesium sulfate-oxygenate cementitious material were added to the mixing equipment 5. The magnesium sulfate-oxygenate cementitious material contained 98 parts of lightly calcined magnesium oxide and 42 parts of magnesium sulfate heptahydrate. After stirring for 3 minutes, the mixture was conveyed to the mixing equipment 6 for iron removal and... The extruded clay-based magnesium recycled aggregate is conveyed to the extrusion molding equipment 7. After the extruded material is screened by the aggregate vibrating screen 24 to remove the excess material, it falls into the clay-based magnesium recycled aggregate bin 8. After curing for 3 days, it is removed from the bin and stacked for further curing or use. The excess material screened out by the aggregate vibrating screen 24 is conveyed by the excess material conveyor belt 25 to the mixing material conveyor belt 6 to continue the production of clay-based magnesium recycled aggregate. After the mixing material on the mixing material conveyor belt 6 is produced, the roller cleaning machine 29 is started to clean the rollers.

[0044] The produced clay-based magnesium recycled aggregate has the following appearance: Figure 8As shown, the 28-day cylinder compressive strength and crushing index are 4.2 MPa and 15%, respectively.

[0045] Example 2 like Figure 2 and Figure 8 As shown, 72.3 parts of mud cake with a moisture content of 54% and 20 parts of waste residue from the ceramic firing process with a particle size of 0.074 mm were added to the crushing equipment 4. The crushed material was then lifted to the mixing equipment 5 by the bucket elevator 16. At the same time, 27.7 parts of magnesium sulfate-oxygenate cementitious material were added to the mixing equipment 5. The magnesium sulfate-oxygenate cementitious material contained 86 parts of lightly calcined magnesium oxide and 66 parts of magnesium sulfate heptahydrate. After stirring for 15 minutes, the mixture was conveyed to the mixing equipment 6 for further processing. Iron and feedstock are conveyed to extrusion molding equipment 7. After extrusion, the clay-based magnesium recycled aggregate is screened by aggregate vibrating screen 24 to remove excess material and falls into clay-based magnesium recycled aggregate bin 8. After curing for 3 days, it is removed from the bin and stacked for further curing or use. The excess material screened by aggregate vibrating screen 24 is conveyed by excess material conveyor belt 25 to mixing material conveyor belt 6 to continue the production of clay-based magnesium recycled aggregate. After the mixing material on mixing material conveyor belt 6 is produced, roller cleaning machine 29 is started to clean the rollers.

[0046] The produced clay-based magnesium recycled aggregate has the following appearance: Figure 8 As shown, the 28-day cylinder compressive strength and crushing index are 5.5 MPa and 13%, respectively.

[0047] Example 3 like Figure 2 and Figure 8 As shown, 80.8 parts of mud cake with a moisture content of 48% and 10 parts of stone powder were added to the crushing equipment 4. The stone powder is a powder particle with a particle size of 0.074mm produced during the concrete crushing process. The crushed material was lifted to the mixing equipment 5 by the bucket elevator 16. At the same time, 19.2 parts of magnesium oxychloride cementitious material were added to the mixing equipment 5. The magnesium oxychloride cementitious material consisted of 96 parts of light-burned magnesium oxide, 148 parts of magnesium chloride hexahydrate, and 35 parts of deburned magnesium oxide. After stirring for 25 minutes, the mixture was added to the mixing equipment 5. Iron removal and material distribution are carried out through the mixing conveyor belt 6 and then conveyed to the extrusion molding equipment 7. After extrusion, the clay-based magnesium recycled aggregate is screened by the aggregate vibrating screen 24 to remove the excess material and falls into the clay-based magnesium recycled aggregate bin 8. After curing for 3 days, it is removed from the bin and stacked for further curing or use. The excess material screened out by the aggregate vibrating screen 24 is conveyed to the mixing conveyor belt 6 via the excess material conveyor belt 25 to continue the production of clay-based magnesium recycled aggregate. After the mixing material on the mixing conveyor belt 6 is produced, the roller cleaning machine 29 is started to clean the rollers.

[0048] The produced clay-based magnesium recycled aggregate has the following appearance: Figure 8 As shown, the 28-day cylinder compressive strength and crushing index are 6.9 MPa and 18%, respectively.

[0049] The clay-based magnesium recycled aggregate produced by this invention is made by adding high-moisture-content colloidal waste to an admixture, crushing it, and then extruding it. This effectively utilizes the chemical compatibility between magnesium cementitious materials and clay-based materials, resulting in advantages such as fast molding, low manufacturing cost, and no raw material waste during the molding process. Furthermore, by processing high-moisture-content colloidal waste such as river silt into clay-based magnesium recycled aggregate, it not only reduces the cost of river silt treatment but also produces value-added products. This achieves efficient and high-value-added industrial utilization of high-moisture-content colloidal waste such as river silt, providing large-scale industrial equipment and process solutions for the high-quality development of industries related to high-moisture-content colloidal waste and the development of new productive forces.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this application specification, they can still modify or make equivalent substitutions to the specific implementation of the present invention, but these modifications or changes do not depart from the protection scope of the pending claims of the present invention.

Claims

1. A method of using equipment for producing clay-based magnesium recycled aggregate, characterized in that, Clay-based magnesium recycled aggregate comprises the following raw materials in parts by weight: 65-85 parts of mud cake with a moisture content of 48-54%, 25-35 parts of cementitious material, and 16-20 parts of admixture; The cementing material is one of magnesium oxysulfate cementing material and magnesium oxychloride cementing material; The production equipment includes crushing equipment, mixing equipment, mixing material conveyor belt (6), extrusion molding equipment (7), aggregate vibrating screen (24) and control system (10); The method of use is for treating high-moisture-content clay-based solid waste with magnesium cementitious materials to produce recycled aggregates, and solves the problem of easy adhesion after mixing magnesium cementitious materials and clay-based materials. The method of use includes the following steps: S1. The mud cake with a moisture content of less than 48-54% is transported to the crushing equipment, and the control system controls the admixtures added to the admixture bin for crushing. S2. The control system weighs the crushed mud cake and transports it to the mixing equipment via a bucket elevator. Then, the weighed cementitious materials are added to the mixing equipment and mixed for 3 to 25 minutes. S3. The mixed material is conveyed by the mixing material conveyor belt, and after iron removal by the iron remover, it is conveyed by the material distributor to the extrusion molding equipment for extrusion molding to obtain the shaped aggregate. S4. The formed clay-based magnesium recycled aggregate falls from the extrusion molding equipment into the aggregate vibrating screen below for vibrating screening. The qualified aggregate after screening falls into the clay-based magnesium recycled aggregate bin. The remaining material after vibrating screening is conveyed to the mixing material conveyor belt via the remaining material conveyor belt to participate in extrusion molding again. The extrusion molding equipment includes: a feed inlet located above the roller extrusion device; the feed inlet is connected to the mixing device via a mixing material conveyor belt; an aggregate vibrating screen is located above the waste material conveyor belt; and an extrusion controller is connected to the control system and the extrusion molding equipment. The roller extrusion device includes: rollers and an extrusion motor. The surface of each roller is provided with several hemispherical grooves. The rollers are connected to the extrusion motor. The roller extrusion device also includes a roller cleaning machine, which is connected to the extrusion controller and is located above the rollers. The aggregate vibrating screen includes: a screen support, an aggregate screen, a vibrating motor, a flexible support, and a flexible cover plate. The screen support is located below the roller extrusion device, the aggregate screen is located on the screen support, the vibrating motor is located above the aggregate screen to drive the screen to vibrate, the flexible support is connected to the aggregate screen, and the flexible cover plate is connected to the flexible support. The aggregate vibrating screen removes the connecting material and edge material between clay-based magnesium recycled aggregate particles, preventing the aggregate from clumping due to the binding effect of magnesium-based cementitious materials after entering the aggregate bin, and ensuring the accuracy of the aggregate cylinder compressive strength and crushing index test results.

2. The method of using the clay-based magnesium recycled aggregate production equipment according to claim 1, characterized in that, The magnesium sulfate-oxygen cementitious material contains 80-100 parts of lightly calcined magnesium oxide and 40-70 parts of magnesium sulfate heptahydrate. The magnesium oxychloride cementitious material contains 80-100 parts of lightly calcined magnesium oxide, 120-150 parts of magnesium chloride hexahydrate, and 20-40 parts of darkly calcined magnesium oxide.

3. The method of using the clay-based magnesium recycled aggregate production equipment according to claim 1, characterized in that, The admixture is one or more of waste ash, waste residue, and stone powder; The waste ash is waste ash from an asphalt mixing plant; the waste residue is waste residue generated during the ceramic firing process; and the stone powder is stone powder generated during the concrete crushing process.

4. The method of using the clay-based magnesium recycled aggregate production equipment according to claim 1, characterized in that, The crushing equipment includes: a feeding hopper, a feed inlet, a crusher, and a discharge outlet. The feeding hopper is equipped with an automatic metering unit. The feed inlet is located at the front end of the crusher, and the discharge outlet is located at the rear end of the crusher. The discharge outlet is connected to a mixing device via a bucket elevator.

5. The method of using the clay-based magnesium recycled aggregate production equipment according to claim 1, characterized in that, The iron remover and the distributor are installed on the mixing material conveyor belt. The iron remover is located between the mixing equipment and the extrusion forming equipment, and the distributor is located above the extrusion forming equipment. The iron remover includes: a rake-type rotary electromagnet, an iron scrap collector, and an iron removal controller. The rake-type rotary electromagnet is connected to the iron scrap collector, and the iron removal controller is connected to the rake-type rotary electromagnet. The lowest point of the rake-type rotary electromagnet is 5mm away from the upper surface of the mixing conveyor belt.

6. The method of using the clay-based magnesium recycled aggregate production equipment according to claim 1, characterized in that, Five extrusion molding machines are provided: two with hemispherical groove diameters of 10mm, two with 20mm, and one with 30mm. The extrusion molding machines with hemispherical groove diameters of 30mm, 20mm, and 10mm are arranged in order of distance from the mixing equipment from the nearest to the farthest point.

7. The method of using the clay-based magnesium recycled aggregate production equipment according to claim 1, characterized in that, The method of use also includes: step S4, after the mixing material on the mixing conveyor belt is produced, the control system controls the roller cleaning machine to clean the rollers.

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