A slag resource recycling system

Abstract

This utility model discloses a slag resource recovery system. The key technical features include a pretreatment device, a crushing device, a magnetic separation device, a jig separation device, a shaking table separation device, and an eddy current separation device. The pretreatment device is used to screen the slag. The crushing device is connected to the pretreatment device and is used to crush large pieces of material. The magnetic separation device is connected to the crushing device and is used to screen iron impurities in the slag. The jig separation device is connected to the magnetic separation device and is used to separate slag particles smaller than 15mm after pretreatment, crushing, and iron removal. The shaking table separation device is connected to the jig separation device and is used to separate the bottom material. The eddy current separation device is connected to the jig separation device and is used to separate the jig overflow. This slag resource recovery system can effectively separate slag and recover metals from it to the maximum extent.

Description

Technical Field

[0001] This utility model relates to the field of resources and environmental protection technology, and more specifically, it relates to a slag resource recycling system. Background Technology

[0002] With the acceleration of urbanization and the improvement of living standards in my country, the amount of domestic waste generated has been increasing year by year. After incineration, a large amount of domestic waste produces slag, accounting for 20% to 30% of the total waste. Preliminary estimates suggest that my country produces over 3.0 × 10⁸ tons of slag annually. Due to the increasing landfill costs, some slag flows into illegal disposal channels. This involves simple sorting and processing of the slag to recover valuable metals, followed by indiscriminate dumping and disposal, polluting the atmosphere and groundwater, causing serious secondary pollution.

[0003] Because slag has a very complex composition and contains a large amount of impurities, improper handling can affect its reuse and the quality of finished products. Therefore, slag treatment systems must be rationally planned and optimized based on the properties of the slag, considering process design, equipment selection, and layout. This optimization aims to achieve effective slag sorting, reduce the content of light and airy materials in recycled aggregates, maximize the recovery of metals such as iron, copper, and aluminum from the slag, produce high-quality recycled aggregates, and achieve 100% comprehensive utilization of slag, thereby further promoting the coordinated development of the circular economy and environmental protection. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a slag resource recycling system that can effectively sort slag and recover metals from slag to the greatest extent.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a slag resource recycling system, comprising a pretreatment device, a crushing device, a magnetic separation device, a jig separation device, a shaking table separation device, and an eddy current separation device;

[0006] The pretreatment device is used for screening the slag;

[0007] The crushing device is connected to the pretreatment device and is used to crush large pieces of material.

[0008] The magnetic separator is connected to the crushing device and is used to screen iron impurities in the waste residue.

[0009] The jig sorting device is connected to the magnetic separator and is used to sort slag smaller than 15mm after pretreatment, crushing and iron removal.

[0010] The shaking table sorting device is connected to the jig sorting device and is used to sort the bottom material.

[0011] The eddy current separator is connected to the jig separator and is used to separate the overflow material from the jig.

[0012] The present invention is further configured to include a slag and water treatment device, which is connected to a crushing device, a magnetic separation device, a jig separation device, a shaking table separation device, and an eddy current separation device.

[0013] The present invention is further configured such that: the sludge and water treatment device includes a dewatering screen, a sedimentation tank, a filter press and a circulating water component, wherein the inlet end of the sedimentation tank is connected to the dewatering screen;

[0014] The filter press is connected to the sedimentation tank, and the sludge in the sedimentation tank is pumped into the filter press for dewatering via a slurry pump.

[0015] The circulating water component is used to recycle the overflow from the sedimentation tank.

[0016] The present invention is further configured such that: the pretreatment device includes a hopper, a belt conveyor, a drum screen and a magnetic separation belt, wherein the hopper conveys the slag to the drum screen for grading operation via the belt conveyor;

[0017] The magnetic separation belts are provided in multiple sets, each corresponding to a different outlet end of the drum screen.

[0018] The present invention is further configured such that: the crushing device includes a crusher, the crusher is connected to a circulating water component, and the crusher is used to add water to the sorted iron and drum screen undersize material to crush them.

[0019] The present invention is further configured such that: the magnetic separation device includes multiple wet magnetic separators, which are used to remove iron from the slag and water of the crusher.

[0020] The present invention is further configured such that: the jig sorting device includes a sawtooth wave jig, which is used to sort the slag and water of the wet magnetic separator.

[0021] The present invention is further configured such that: the shaking table sorting device includes a shaking table sorting machine, which is used to further sort the bottom material sorted by the sawtooth wave jig.

[0022] The present invention is further configured such that: the eddy current separation device includes an eddy current separator, which is used to separate aluminum products from slag with particle sizes of 3mm-10mm and 10mm and above by conveying them to the eddy current separator via a coarse sand conveyor belt and a return material conveyor belt, respectively.

[0023] In summary, this utility model has the following beneficial effects: it enables effective sorting of slag, reduces the content of light and airy materials in recycled aggregates, maximizes the recovery of metals such as iron, copper, and aluminum from slag, produces high-quality recycled aggregates, and achieves 100% comprehensive utilization of slag, thereby further promoting the coordinated development of circular economy and environmental protection. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a slag resource recycling system.

[0025] Figure 2 This is a schematic diagram of the steps in a slag resource recycling system;

[0026] Figure 3 This is a schematic diagram of the plan structure of the slag resource recovery system.

[0027] Reference numerals in the attached drawings: 1. Pretreatment device; 2. Crushing device; 3. Magnetic separation device; 4. Jigging machine separation device; 5. Shaking table separation device; 6. Eddy current separation device; 7. Slag and water treatment device. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0029] Reference Figures 1 to 3 As shown, in order to achieve the above objectives, this utility model provides the following technical solution: a slag resource recycling system, including a pretreatment device 1, a crushing device 2, a magnetic separation device 3, a jig separation device 4, a shaking table separation device 5, and an eddy current separation device 6.

[0030] Pretreatment unit 1 is used for screening slag;

[0031] The crushing device 2 is connected to the pretreatment device 1 and is used to crush large pieces of material.

[0032] The magnetic separator 3 is connected to the crushing device 2 and is used to screen iron impurities in the waste residue.

[0033] The jig sorting device 4 is connected to the magnetic separator 3 and is used to sort slag smaller than 15mm after pretreatment, crushing and iron removal.

[0034] The shaking table sorting device 5 is connected to the jig sorting device 4 and is used to sort the bottom material that has been sorted.

[0035] The eddy current separator 6 is connected to the jig separator 4 and is used to separate the overflow material from the jig.

[0036] The resource utilization methods for slag include dry and wet processes. Wet processes are widely used in municipal solid waste slag resource utilization projects due to their mature technology, high resource utilization rate, and high product extraction rate. The physical and chemical properties of slag: Freshly discharged slag from the slag discharge machine of a waste-to-energy incineration plant are dark brown. As the moisture content decreases and the internal chemical properties stabilize, the slag gradually turns grayish-brown or light gray. Slag is mainly composed of inorganic materials, primarily gravel, bricks, glass, molten slag, ceramics, metals, and soil, while also containing small amounts of unburned materials such as strips of cloth, plastics, and wood chips.

[0037] The main chemical components in the slag are oxides, in descending order of content: SiO2, CaO, Al2O3, and Fe2O3. It also contains small amounts of K2O, Na2O, MgO, SO3, and Cl.

[0038] like Figure 2 and Figure 3 As shown, the pretreatment device 1, crushing device 2, magnetic separation device 3, jig separation device 4, shaking table separation device 5, and eddy current separation device 6 all include several conveying components, which can be a series of devices such as conveyor belts and water pumps.

[0039] The present invention is further configured to include a slag and water treatment device 7, which is connected to the crushing device 2, the magnetic separation device 3, the jig separation device 4, the shaking table separation device 5, and the eddy current separation device 6.

[0040] The present invention is further configured such that: the sludge and water treatment device 7 includes a dewatering screen, a sedimentation tank, a filter press and a circulating water component, and the inlet end of the sedimentation tank is connected to the dewatering screen;

[0041] The filter press is connected to the sedimentation tank. The sludge in the sedimentation tank is pumped into the filter press for dewatering.

[0042] The circulating water component is used to recycle the overflow from the sedimentation tank.

[0043] The slag wash water treatment process involves the following steps: To achieve a closed-loop circulation of slag wash water, a slag wash water treatment system must be installed. All slag wash water enters a sedimentation tank for sedimentation, and the settled sludge is pumped into a filter press for dewatering using a slurry pump. The overflow from the sedimentation tank enters a circulating water tank for recycling. The system achieves a first-stage closed-loop circulation of wash water with no external drainage.

[0044] The water in the circulating water tank can be reused in other processes, thus fulfilling the requirement of water recycling.

[0045] The present invention is further configured such that: the pretreatment device 1 includes a hopper, a belt conveyor, a drum screen and a magnetic separation belt, and the hopper conveys the slag to the drum screen for grading operation via the belt conveyor;

[0046] Multiple sets of magnetic separator belts are set up, each corresponding to one of the multiple outlet ends of the drum screen.

[0047] The pretreatment device 1 processes the following steps: the slag from the waste incineration power plant is transported by truck to the slag storage workshop where the slag comprehensive utilization workshop is located, and then sent by a loader to the unloading hopper with a belt conveyor at the bottom.

[0048] A large-aperture screen (200mm × 150mm) is installed above the hopper to separate large-volume materials and prevent clogging of the hopper outlet. A belt conveyor below the hopper transports the slag to a coarse rotary drum screen with a 60mm aperture for grading. Materials larger than 60mm are conveyed by belt to a crusher for crushing to a particle size below 60mm, and then fall onto the feeding belt. The undersize material from the rotary drum screen is conveyed by belt to a conveyor belt, where a magnetic separator removes iron blocks. A belt separator is installed on the large material conveyor belt; the iron removed by the belt separator and the iron blocks removed by the magnetic separator fall onto the main conveyor belt.

[0049] Based on this, combined with manual operation, some unsortable debris can be picked out.

[0050] The present invention is further configured such that: the crushing device 2 includes a crusher, the crusher is connected to the circulating water component, and the crusher is used to add water to the sorted iron and the undersize material of the drum screen to crush it.

[0051] The crushing process involves the following steps: Before slag sorting, large pieces of material need to be crushed. A crusher is used to crush the sorted iron and the material undersize from the coarse screen drum with water, ensuring the particle size meets the requirements of subsequent processes and removing any adhering substances from the material.

[0052] After the iron is dehydrated by passing it through a drum screen, scrap iron blocks that can be sold externally are obtained.

[0053] The present invention is further configured such that: the magnetic separation device 3 includes multiple wet magnetic separators, which are used to remove iron from the slag and water of the crusher.

[0054] The magnetic separation process involves the following steps: For scrap iron larger than 10mm in size from the slag, a magnetic separator is generally used for separation; for scrap iron with a size of 2~10mm, a wet drum magnetic separator is generally used. Specifically, the material flow after crushing with water in the crusher is conveyed through a chute to three wet magnetic separators for magnetic separation, where the magnetic separators further remove iron from the slag and molten metal. The slag and molten metal after magnetic separation is then fed into a jig for further separation through a chute.

[0055] The present invention is further configured such that: the jig sorting device 4 includes a sawtooth wave jig, which is used to sort the slag and water of the wet magnetic separator.

[0056] The jigging process involves the following steps: Slag smaller than 15mm, after pretreatment, crushing, and iron removal, is injected with water and then separated using a gravity separator. The gravity separator primarily separates various materials from the slag based on their density. A sawtooth wave jigging machine is used for separation; this equipment features a sawtooth waveform in its water flow pulsation, resulting in good separation of various materials. Specifically: all the slag and slurry after magnetic separation enter the sawtooth wave jigging machine for further separation. The overflow from the jigging machine enters a screw conveyor for dewatering, and the underflow enters the next stage of jigging for further separation, yielding fine-grained materials.

[0057] The present invention is further configured such that: the shaking table sorting device 5 includes a shaking table sorting machine, which is used to further sort the bottom material sorted by the sawtooth wave jig.

[0058] The shaking table separation process involves the following steps: The shaking table is a commonly used piece of equipment in film mineral processing, mainly used for separating fine-grained materials. The bottom material separated by the last stage sawtooth wave jig generally has a particle size of less than 3mm and can be further separated by the shaking table separator to separate out metals such as copper powder and stainless steel.

[0059] The present invention is further configured such that: the eddy current separation device 6 includes an eddy current separator, which is used to separate aluminum products from slag with particle sizes of 3mm-10mm and 10mm and above by conveying them to the eddy current separator via a coarse sand conveyor belt and a return material conveyor belt respectively.

[0060] The eddy current separation process involves the following steps: The eddy current separator primarily utilizes the principle of electromagnetic induction to effectively separate non-magnetic metals. Specifically: After dewatering, the jigging overflow enters a secondary sorting drum screen. Slag particles of 3mm-10mm and larger than 10mm are conveyed to the eddy current separator via belt conveyors from the coarse sand belt and the return material belt, respectively, to separate aluminum products. The aluminum-removed slag aggregate of 3mm-10mm can be transported for sale and ultimately utilized. The aluminum-removed slag aggregate larger than 10mm is returned to the crushing system for secondary crushing.

[0061] In summary, achieving effective slag sorting, reducing the content of light and airy materials in recycled aggregates, maximizing the recovery of metals such as iron, copper, and aluminum from slag, producing high-quality recycled aggregates, and realizing 100% comprehensive utilization of slag will further promote the coordinated development of circular economy and environmental protection.

[0062] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A slag resource recovery system characterized by: It includes a pretreatment device (1), a crushing device (2), a magnetic separation device (3), a jig separation device (4), a shaking table separation device (5), and an eddy current separation device (6); The pretreatment device (1) is used to screen the slag; The crushing device (2) is connected to the pretreatment device (1) and is used to crush large pieces of material. The magnetic separator (3) is connected to the crushing device (2) and is used to screen iron impurities in the waste residue. The jig sorting device (4) is connected to the magnetic separator (3) and is used to sort slag smaller than 15mm after pretreatment, crushing and iron removal. The shaking table sorting device (5) is connected to the jig sorting device (4) and is used to sort the bottom material that has been sorted. The eddy current separator (6) is connected to the jig separator (4) and is used to separate the jig overflow.

2. A slag resource recovery system according to claim 1, characterised in that: It also includes a slag and water treatment device (7), which is connected to the crushing device (2), the magnetic separation device (3), the jig separation device (4), the shaking table separation device (5) and the eddy current separation device (6).

3. A slag resource recovery system according to claim 2, characterised in that: The sludge and water treatment device (7) includes a dewatering screen, a sedimentation tank, a filter press, and a circulating water component. The inlet of the sedimentation tank is connected to the dewatering screen. The filter press is connected to the sedimentation tank, and the sludge in the sedimentation tank is pumped into the filter press for dewatering via a slurry pump. The circulating water component is used to recycle the overflow from the sedimentation tank.

4. The slag resource recovery system according to claim 1, characterized in that: The pretreatment device (1) includes a hopper, a belt conveyor, a drum screen and a magnetic separation belt. The hopper transports the slag to the drum screen for grading via the belt conveyor. The magnetic separation belts are provided in multiple sets, each corresponding to a different outlet end of the drum screen.

5. A slag resource recovery system according to claim 3, characterized in that: The crushing device (2) includes a crusher connected to a circulating water component. The crusher is used to add water to the sorted iron and drum screen undersize material to crush it.

6. A slag resource recovery system according to claim 5, characterized in that: The magnetic separation device (3) includes multiple wet magnetic separators, which are used to remove iron from the slag and water of the crusher.

7. A slag resource recovery system according to claim 6, characterized in that: The jig sorting device (4) includes a sawtooth wave jig, which is used to sort the slag and water of the wet magnetic separator.

8. A slag resource recovery system according to claim 7, characterized in that: The shaking table sorting device (5) includes a shaking table sorter, which is used to further sort the bottom material separated by the sawtooth wave jig.

9. A slag resource recovery system according to claim 8, characterized in that: The eddy current separation device (6) includes an eddy current separator, which is used to separate aluminum products from slag with particle sizes of 3mm-10mm and 10mm and above by conveying it to the eddy current separator via a coarse sand belt and a return material belt, respectively.

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