Method and equipment for preparing regenerated planting soil from muck

Abstract

The invention discloses a method for preparing regenerated planting soil from muck. The method comprises the following steps of feeding and screening, weighing and metering, mixed feeding, primary crushing and mixing, secondary crushing and mixing and finished product discharging. The equipment for preparing the regenerated planting soil from the muck comprises a feeding device, a screening device, a belt conveyor assembly with a scale, a primary crushing and mixing device, a secondary crushing and mixing device and a finished product belt conveyor, the feeding device conveys dry soil, wet soil and humus soil into the screening device, and the screening device conveys the screened dry soil and wet soil to the belt conveyor assembly with the scale; the primary crushing and mixing device receives dry soil, wet soil and humus soil, the dry soil, the wet soil and the humus soil enter the secondary crushing and mixing device after being subjected to primary crushing and mixing, finished planting soil is obtained through crushing and mixing, and the finished planting soil belt conveyor is used for receiving and transporting the finished planting soil output by the secondary crushing and mixing device. The resource utilization rate of the muck is increased, and the stacking of the muck and the pollution to the environment are reduced.

Description

Technical Field

[0001] This invention relates to the field of construction waste treatment technology, specifically to a method and equipment for preparing recycled planting soil from construction waste. Background Technology

[0002] During the construction process, the development of underground space for projects such as underground parking lots, shopping malls, and subways inevitably generates a large amount of excess soil, known as construction waste. Construction waste mostly originates from deep underground soil layers and is characterized by high water content and high viscosity, making it unusable directly, especially in coastal plains. In recent years, with the rapid development of urban construction and the significant increase in urban residential area in my country, the amount of construction waste has also shown a substantial upward trend. Therefore, due to the huge stockpile of construction waste and the lack of effective disposal methods, this "byproduct" of urban construction has seriously restricted further urban development.

[0003] Currently, the disposal of deep construction waste mainly relies on simple landfilling and ocean dumping, which are not only costly but also occupy land and damage the ecological environment. These large quantities of construction waste cause various environmental hazards, including urban road pollution, air pollution, water pollution, as well as encroaching on large amounts of land and affecting urban planning.

[0004] Therefore, this invention designs a method and equipment for preparing recycled planting soil from slag to solve the above problems. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, the present invention provides a method for preparing recycled planting soil from slag.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0007] A method for preparing recycled planting soil from construction waste includes the following steps:

[0008] S1. Feeding and screening: Dry soil and wet soil are fed into the screening device through the feeding device. The screen of the screening device has a screen aperture of 100mm and a vibration frequency of 30-50Hz. Dry soil and wet soil with a particle size of less than 100mm are screened out and fed into the conveyor belt assembly with a weighing belt.

[0009] S2. Weighing and Metering: Humus is transported to the weighing conveyor assembly via a feeding device. The weighing conveyor assembly weighs the dry soil, wet soil and humus in real time via a weight sensor and dynamically adjusts the conveying volume of dry soil, wet soil and humus to keep the mass ratio of the three stable at 40%~50%:40%~50%:10%~20%.

[0010] S3. Mixed feeding: The weighed dry soil, wet soil and humus are transported to the feeding conveyor belt at a speed of 8 to 12 m / min by the weighing conveyor belt assembly, and then transported to the first three-axis soil breaker by the feeding conveyor belt. The rotor speed of the first three-axis soil breaker is 300 to 400 r / min.

[0011] S4. Primary crushing and mixing: The first three-axis crusher crushes and mixes dry soil, wet soil and humus soil through high-speed rotating crushing teeth. During the crushing process, the material temperature is kept below 40℃ to obtain intermediate products with a particle size ≤20mm.

[0012] S5. Secondary crushing and mixing: The intermediate product is conveyed to the second and third shaft crushers via the intermediate product belt conveyor. The rotor speed of the second and third shaft crushers is 200-300 r / min. The material is further mixed by low-speed kneading to achieve a uniformity of more than 90% and obtain finished planting soil with a particle size ≤10mm.

[0013] S6. Finished product discharge: The finished planting soil enters the finished product conveyor belt and is transported to the finished product stockpile for storage. During the stockpile process, it is covered with breathable covering material.

[0014] Furthermore, S1 also includes: when the dry soil and wet soil pass through the feeding device, the first iron remover and the second iron remover located above the feeding belt conveyor assembly in the feeding device adsorb the metal impurities contained in the dry soil and wet soil respectively; the metal impurities adsorbed by the first iron remover and the second iron remover are transported to the stockpile next to the feeding belt conveyor for storage.

[0015] Furthermore, in S1, the material obtained by the screening device is transported to the material storage yard.

[0016] Furthermore, in S2, the organic matter content of the humus soil is ≥30%, and the pH value is 5.5 to 7.5.

[0017] Furthermore, S5 also includes: when the intermediate product passes through the intermediate product conveyor belt, the metal impurities in the intermediate product are adsorbed by the third iron remover above the intermediate product conveyor belt.

[0018] A device for preparing recycled planting soil from slag includes a feeding device, a screening device, a belt conveyor assembly with a scale, a primary crushing and mixing device, a secondary crushing and mixing device, and a finished product belt conveyor. The feeding device transports dry soil, wet soil, and humus into the screening device. The screening device conveys the screened dry soil and wet soil to the belt conveyor assembly with a scale. The primary crushing and mixing device receives dry soil, wet soil, and humus in a mass ratio of 40%–50%: 40%–50%: 10%–20%. After primary crushing and mixing, the soil enters the secondary crushing and mixing device, where it is crushed and mixed to obtain the finished planting soil. The finished product belt conveyor receives and transports the finished planting soil output from the secondary crushing and mixing device. The finished planting soil is transported to a finished product stockpile by the finished product belt conveyor.

[0019] Furthermore, the feeding device includes a dry soil feeder, a wet soil feeder, a humus feeder, a dry soil feeding belt conveyor, and a wet soil feeding belt conveyor. The dry soil feeder and the wet soil feeder respectively transport dry soil and wet soil to the dry soil feeding belt conveyor and the wet soil feeding belt conveyor. The ends of the dry soil feeding belt conveyor and the wet soil feeding belt conveyor are connected to a screening device. The humus feeder is used to transport humus to the weighing belt conveyor assembly.

[0020] Furthermore, the primary crushing and mixing device includes a feeding belt conveyor and a first three-axis crusher, and the secondary crushing and mixing device includes an intermediate product belt conveyor and a second three-axis crusher. The feeding belt conveyor is connected to a weighing belt conveyor assembly and the first three-axis crusher. The intermediate product belt conveyor is connected to the first three-axis crusher and the second three-axis crusher. The output of the second three-axis crusher is connected to a finished product belt conveyor for transporting the finished planting soil to the finished product stockpile.

[0021] Furthermore, the belt conveyor assembly includes a dry soil belt conveyor, a wet soil belt conveyor, and a humus belt conveyor. The screening device includes a first vibrating screen and a second vibrating screen. The first vibrating screen is located between the dry soil feeding belt conveyor and the dry soil belt conveyor, and the second vibrating screen is connected to the wet soil feeding belt conveyor and the wet soil belt conveyor.

[0022] Furthermore, it also includes a first iron separator and a second iron separator respectively located above the dry soil feeding conveyor and the wet soil feeding conveyor, and a third iron separator located above the intermediate product conveyor, wherein the magnetic force of the first iron separator and the second iron separator is greater than or equal to the magnetic force of the third iron separator.

[0023] As can be seen from the above description, the beneficial effects of the method for preparing recycled planting soil from slag provided by the present invention are as follows:

[0024] This invention provides a method and equipment for preparing recycled planting soil from construction waste and humus, realizing the resource utilization of construction waste. First, the finished planting soil produced by this method has stable quality. By controlling the scientific ratio of dry soil, wet soil, and humus, combined with two-stage three-axis soil breaker processing, the final planting soil has excellent fertility and permeability, fully meeting the needs of plant growth. Second, it has outstanding environmental benefits. The screening device removes large-diameter impurities, and multiple iron removers provide multi-stage purification, effectively removing metal impurities and completely avoiding water, soil, and air pollution caused by traditional waste landfill and dumping methods, significantly reducing the burden on the urban environment. Third, the feeding device, vibrating screen, belt conveyor with weighing system, and crushing and mixing components are closely integrated, realizing automated continuous production from raw materials to finished products. This ensures accurate proportioning and efficient processing. Furthermore, due to the wide availability of raw materials and low equipment operating costs, it is easy to promote and apply on a large scale, providing strong support for sustainable urban development and ecological civilization construction. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the equipment process of the present invention.

[0026] In the diagram: 1. Dry soil feeder; 2. Wet soil feeder; 3. Humus feeder; 4. Dry soil feeder belt conveyor; 5. Wet soil feeder belt conveyor; 6. Screening device; 61. First vibrating screen; 62. Second vibrating screen; 7. Belt conveyor assembly with scale; 71. Dry soil belt conveyor with scale; 72. Wet soil belt conveyor with scale; 73. Humus belt conveyor with scale; 8. Feed belt conveyor; 9. First three-axis crusher; 10. Intermediate product belt conveyor; 11. Second three-axis crusher; 12. Finished product belt conveyor; 13. First iron separator; 14. Second iron separator; 15. Third iron separator. Detailed Implementation

[0027] The present invention will be further described below through specific embodiments. A method for preparing recycled planting soil from construction waste includes the following steps:

[0028] S1. Feeding and screening: Dry soil and wet soil are fed into screening device (6) respectively. The screen mesh of screening device (6) is 100mm and the vibration frequency is 30-50Hz. Dry soil and wet soil with a particle size of less than 100mm are screened out and fed into the belt conveyor assembly (7) with scale.

[0029] S11. When the dry soil and wet soil pass through the feeding device, the first iron remover (13) and the second iron remover (14) located above the feeding belt conveyor assembly in the feeding device adsorb the metal impurities contained in the dry soil and wet soil respectively.

[0030] S12. Metal impurities adsorbed by the first iron remover (13) and the second iron remover (14) are transported to the stockpile for storage.

[0031] S2. Weighing and metering: Humus with an organic matter content of ≥30% and a pH value of 5.5 to 7.5 is transported to the conveyor belt assembly (7) with a weighing device. The conveyor belt assembly (7) weighs the dry soil, wet soil and humus in real time through a weight sensor and dynamically adjusts the conveying amount of dry soil, wet soil and humus so that the mass ratio between the three is kept stable at 45%:45%:10%.

[0032] S3, Mixed feeding: The weighed dry soil, wet soil and humus soil are transported by the weighing belt conveyor assembly (7) to the feeding belt conveyor (8) at a speed of 8 to 12 m / min, and then transported by the feeding belt conveyor (8) to the first three-axis soil breaker (9). The rotor speed of the first three-axis soil breaker (9) is 300 to 400 r / min.

[0033] S4. Primary crushing and mixing: The first three-axis crusher (9) crushes and mixes dry soil, wet soil and humus soil by high-speed rotating crushing teeth. During the crushing process, the material temperature is kept below 40℃ to obtain intermediate products with a particle size ≤20mm.

[0034] S5. Secondary crushing and mixing: The intermediate product is conveyed to the second three-axis soil crusher (11) via the intermediate product belt conveyor (10). The rotor speed of the second three-axis soil crusher (11) is 200-300 r / min. The material is further mixed by low-speed kneading to achieve a uniformity of more than 90% and obtain finished planting soil with a particle size ≤10mm.

[0035] S51. When the intermediate product passes through the intermediate product conveyor belt (10), the metal impurities in the intermediate product are adsorbed by the third iron remover (15) above the intermediate product conveyor belt.

[0036] S6. Finished product discharge: The finished planting soil enters the finished product conveyor belt (12) and is transported to the finished product stockpile for storage. During the stockpile process, it is covered with breathable covering material.

[0037] The above method can stably and efficiently convert construction waste into recycled planting soil. The whole process is simple to operate, low in cost, and can effectively guarantee the quality of the finished planting soil, which has good promotion and application value.

[0038] A device for preparing recycled planting soil from slag includes a feeding device, a screening device, a belt conveyor assembly (7) with a scale, a primary crushing and mixing device, a secondary crushing and mixing device, and a finished product belt conveyor (12). The feeding device transports dry soil, wet soil, and humus into the screening device. The screening device includes a screening device (6), a belt conveyor assembly (7), and a crushing and mixing assembly. The screening device (6) conveys the screened dry soil and wet soil to the belt conveyor assembly (7). The crushing and mixing assembly receives dry soil, wet soil, and humus with a mass ratio of 40%–50%: 40%–50%: 10%–20%, and crushes and mixes them to obtain finished planting soil. The finished product belt conveyor (12) is used to receive and transport the finished planting soil output from the secondary crushing and mixing device. The finished planting soil is transported to the finished product stockpile by the finished product belt conveyor (12).

[0039] The above-mentioned feeding device includes a dry soil feeder (1), a wet soil feeder (2), a humus feeder (3), a dry soil feeding belt conveyor (4), and a wet soil feeding belt conveyor (5). The dry soil feeder (1) and the wet soil feeder (2) respectively transport dry soil and wet soil to the dry soil feeding belt conveyor (4) and the wet soil feeding belt conveyor (5). The ends of the dry soil feeding belt conveyor (4) and the wet soil feeding belt conveyor (5) are connected to a screening device (6). The humus feeder (3) is used to transport humus to the weighing belt conveyor assembly (7).

[0040] Both the dry soil feeder (1) and the humus soil feeder (3) mentioned above are plate chain feeders. Plate chain feeders have the characteristics of strong conveying capacity and adaptability to various materials. They can withstand the impact force when dumping slag and soil, and feed the slag and soil raw materials evenly and stably, ensuring the stable and efficient conveying of raw materials. In addition, the wet soil feeder (2) is a sludge plate chain feeder to adapt to the characteristics of high water content and high viscosity of wet soil.

[0041] Furthermore, the primary crushing and mixing device includes a feeding belt conveyor (8) and a first three-axis crusher (9), and the secondary crushing and mixing device includes an intermediate product belt conveyor (10) and a second three-axis crusher (11). The feeding belt conveyor (8) is connected to the weighing belt conveyor assembly (7) and the first three-axis crusher (9). The intermediate product belt conveyor (10) is connected to the first three-axis crusher (9) and the second three-axis crusher (11). The second three-axis crusher (11) outputs finished planting soil that is connected to the finished product belt conveyor (12) for transportation to the finished material stockpile.

[0042] The core particle size range for preparing recycled planting soil from construction waste is 0–50 mm, with 5–10 mm being the main component. Different particle sizes need to be mixed in proportion to balance aeration, water retention, and support functions. Therefore, in order to prepare recycled planting soil with good fertility and aeration, this method uses a two-stage triaxial breaker to obtain finished planting soil with smaller particle size and more uniform mixing of raw materials and ingredients.

[0043] Furthermore, the belt conveyor assembly (7) includes a dry soil belt conveyor (71), a wet soil belt conveyor (72), and a humus belt conveyor (73). The screening device (6) includes a first vibrating screen (61) and a second vibrating screen (62). The first vibrating screen (61) is located between the dry soil feeding belt conveyor (4) and the dry soil belt conveyor (71). The second vibrating screen (62) is connected to the wet soil feeding belt conveyor (5) and the wet soil belt conveyor (72).

[0044] Furthermore, it also includes a first iron separator (13) and a second iron separator (14) respectively located above the dry soil feeding conveyor belt (4) and the wet soil feeding conveyor belt (5), and a third iron separator (15) located above the intermediate product conveyor belt (10), wherein the magnetic force of the first iron separator (13) and the second iron separator (14) is greater than or equal to the magnetic force of the third iron separator (15).

[0045] The magnetic force of the first iron separator (13) and the second iron separator (14) is greater than or equal to that of the third iron separator (15). The first iron separator (13) and the second iron separator (14) are used to remove large metal impurities from dry and wet soil, so they have a stronger magnetic force. The third iron separator (15) is set up to remove any remaining metal impurities more thoroughly.

[0046] refer to Figure 1 This invention discloses a method and equipment for preparing recycled planting soil from construction waste, which enables the resource utilization of construction waste, reduces its environmental harm, and produces high-quality planting soil suitable for various applications. Before proceeding with this method, the raw materials must be prepared. The raw materials are dry soil, wet soil, and humus, with a specific weight ratio of 45%:45%:10%. The humus has an organic matter content ≥30% and a pH value of 5.5–7.5, providing abundant nutrients for the final planting soil. The specific implementation process is as follows:

[0047] S1. Place dry soil and wet soil on the corresponding dry soil feeder (1) and wet soil feeder (2), respectively. Both feeders are plate chain feeders. They transport the dry soil and wet soil to the dry soil feeding belt conveyor (4) and wet soil feeding belt conveyor (5), respectively. The feeders then enter the first vibrating screen (61) and the second vibrating screen (62), respectively. The screen mesh size of the vibrating screens is 100mm, and the vibration frequency is 30-50Hz. The dry soil and wet soil with a particle size of less than 100mm are screened out and enter the dry soil belt conveyor (71) and wet soil belt conveyor (72), respectively. Machine (72); When the dry soil and wet soil pass through the dry soil feeding belt conveyor (4) and the wet soil feeding belt conveyor (5), the first iron remover (13) and the second iron remover (14) respectively installed above the dry soil feeding belt conveyor (4) and the wet soil feeding belt conveyor (5) in the feeding device adsorb the metal impurities contained in the dry soil and wet soil respectively; The metal impurities adsorbed by the first iron remover (13) and the second iron remover (14) are transported to the stockpile for storage, which is convenient for subsequent recycling and processing; The oversize material obtained by the screening device (6) is transported to the material stockpile for other uses.

[0048] S2. Humus is transported to humus conveyor belt (73) via humus feeder (3). The conveyor belt assembly (7) weighs dry soil, wet soil and humus in real time via weight sensor and dynamically adjusts the conveying volume of dry soil, wet soil and humus so that the mass ratio between the three is kept stable at 45%:45%:10%.

[0049] S3. The weighed dry soil, wet soil and humus soil are transported by the weighing belt conveyor assembly (7) to the feeding belt conveyor (8) at a speed of 8 to 12 m / min, and then transported by the feeding belt conveyor (8) to the first three-axis soil breaking machine (9). The rotor speed of the first three-axis soil breaking machine (9) is 300 to 400 r / min.

[0050] S4. The first three-axis soil crusher (9) fully crushes and mixes dry soil, wet soil and humus through high-speed rotating crushing teeth, so that wet soil, dry soil and humus are initially fused. During the crushing process, the material temperature is kept below 40℃ to obtain intermediate products with a particle size ≤20mm.

[0051] S5. The intermediate product is conveyed to the second triaxial soil crusher (11) via the intermediate product conveyor belt (10). Its rotor speed is 200-300 r / min. It is further mixed by low-speed kneading to make the material uniformity reach more than 90%. Compared with the first triaxial soil crusher (9), it can perform more refined processing on the intermediate product, further crush and mix it, and make the material more uniformly mixed, finally obtaining finished planting soil with a particle size ≤10mm. When the intermediate product passes through the intermediate product conveyor belt (10), the metal impurities are adsorbed by the third iron remover (15) located above the intermediate product conveyor belt (10).

[0052] S6. The finished planting soil enters the finished product conveyor belt (12) and is transported to the finished product storage yard for storage. During the storage process, it is covered with breathable covering material so that it can be used in urban greening, agricultural planting and other fields as needed.

[0053] The above are merely some specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A method for preparing recycled planting soil from construction waste, characterized in that, Includes the following steps: S1. Feeding and screening: Dry soil and wet soil are fed into the screening device through the feeding device. The screen of the screening device has a screen aperture of 100mm and a vibration frequency of 30-50Hz. Dry soil and wet soil with a particle size of less than 100mm are screened out and fed into the conveyor belt assembly with a weighing belt. S2. Weighing and Metering: Humus is transported to the weighing conveyor assembly via a feeding device. The weighing conveyor assembly weighs the dry soil, wet soil and humus in real time via a weight sensor and dynamically adjusts the conveying volume of dry soil, wet soil and humus to keep the mass ratio of the three stable at 40%~50%:40%~50%:10%~20%. S3. Mixed feeding: The weighed dry soil, wet soil and humus are transported to the feeding conveyor belt at a speed of 8 to 12 m / min by the weighing conveyor belt assembly, and then transported to the first three-axis soil breaker by the feeding conveyor belt. The rotor speed of the first three-axis soil breaker is 300 to 400 r / min. S4. Primary crushing and mixing: The first three-axis crusher crushes and mixes dry soil, wet soil and humus soil through high-speed rotating crushing teeth. During the crushing process, the material temperature is kept below 40℃ to obtain intermediate products with a particle size ≤20mm. S5. Secondary crushing and mixing: The intermediate product is conveyed to the second and third shaft crushers via the intermediate product belt conveyor. The rotor speed of the second and third shaft crushers is 200-300 r / min. The material is further mixed by low-speed kneading to achieve a uniformity of more than 90% and obtain finished planting soil with a particle size ≤10mm. S6. Finished product discharge: The finished planting soil enters the finished product conveyor belt and is transported to the finished product stockpile for storage. During the stockpile process, it is covered with breathable covering material.

2. The method for preparing recycled planting soil from construction waste according to claim 1, characterized in that: In step S1, when the dry soil and wet soil pass through the feeding device, the first and second iron removers located above the feeding belt conveyor assembly in the feeding device adsorb the metal impurities contained in the dry soil and wet soil respectively; the metal impurities adsorbed by the first and second iron removers are transported to the stockpile next to the feeding belt conveyor for storage.

3. The method for preparing recycled planting soil from construction waste according to claim 1, characterized in that: In step S1, the material obtained by the screening device is transported to the material storage yard.

4. The method for preparing recycled planting soil from construction waste according to claim 1, characterized in that: In S2, the organic matter content of the humus soil is ≥30%, and the pH value is 5.5 to 7.

5.

5. The method for preparing recycled planting soil from slag as described in claim 1, characterized in that: In step S5, when the intermediate product passes through the intermediate product conveyor belt, the metallic impurities in the intermediate product are adsorbed by the third iron remover above the intermediate product conveyor belt.

6. A device for preparing recycled planting soil from construction waste, characterized in that: The system includes a feeding device, a screening device, a belt conveyor assembly with a weighing scale, a primary crushing and mixing device, a secondary crushing and mixing device, and a finished product belt conveyor. The feeding device transports dry soil, wet soil, and humus into the screening device. The screening device conveys the screened dry soil and wet soil to the belt conveyor assembly with a weighing scale. The primary crushing and mixing device receives dry soil, wet soil, and humus in a mass ratio of 40%–50%: 40%–50%: 10%–20%. After primary crushing and mixing, the soil enters the secondary crushing and mixing device, where it is crushed and mixed to obtain finished planting soil. The finished product belt conveyor receives and transports the finished planting soil output from the secondary crushing and mixing device. The finished planting soil is transported to the finished product stockpile via the finished product belt conveyor.

7. The equipment for preparing recycled planting soil from slag as described in claim 6, characterized in that: The feeding device includes a dry soil feeder, a wet soil feeder, a humus feeder, a dry soil feeding belt conveyor, and a wet soil feeding belt conveyor. The dry soil feeder and the wet soil feeder respectively transport dry soil and wet soil to the dry soil feeding belt conveyor and the wet soil feeding belt conveyor. The ends of the dry soil feeding belt conveyor and the wet soil feeding belt conveyor are connected to a screening device. The humus feeder is used to transport humus to the weighing belt conveyor assembly.

8. The equipment for preparing recycled planting soil from slag as described in claim 6, characterized in that: The primary crushing and mixing device includes a feeding belt conveyor and a first three-axis crusher. The feeding belt conveyor is connected to a weighing belt conveyor assembly and the first three-axis crusher. The secondary crushing and mixing device includes an intermediate product belt conveyor and a second three-axis crusher. The intermediate product belt conveyor is connected to the first three-axis crusher and the second three-axis crusher.

9. The equipment for preparing recycled planting soil from slag as described in claim 7 or 8, characterized in that: The belt conveyor assembly includes a dry soil belt conveyor, a wet soil belt conveyor, and a humus belt conveyor. The screening device includes a first vibrating screen and a second vibrating screen. The first vibrating screen is located between the dry soil feeding belt conveyor and the dry soil belt conveyor, and the second vibrating screen is connected to the wet soil feeding belt conveyor and the wet soil belt conveyor.

10. The equipment for preparing recycled planting soil from slag as described in claim 7 or 8, characterized in that: It also includes a first iron separator and a second iron separator respectively installed above the dry soil feeding conveyor and the wet soil feeding conveyor, and a third iron separator installed above the intermediate product conveyor. The magnetic force of the first iron separator and the second iron separator is greater than or equal to the magnetic force of the third iron separator.

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