Aluminum metal extraction system for waste incineration slag

Abstract

The invention provides an aluminum metal extraction system for waste incineration slag, and relates to the field of slag waste reutilization. The aluminum metal extraction system for the waste incineration slag comprises a first-stage dewatering screen and a second-stage dewatering screen, after the first-stage dewatering screen separates a water-sand mixture of 32 microns to 75 microns, the remaining slag is conveyed to the second-stage dewatering screen, and then the second-stage dewatering screen divides the slag into sand materials of 75 microns to 3 mm, sand materials of 3 mm to 40 mm and sand materials of more than 40 mm. According to the aluminum metal extraction system for the waste incineration slag, the slag with different diameters can be divided into different eddy current sorting machines to be treated, the slag can be dried through drying, dispersing and vibrating equipment, the slag containing water can be dispersed through scraping teeth and vibration, and when the slag with the high water content and the small particle diameter is dispersed, a discharging plate vibrates and impacts the scraping teeth, so that the slag with the high water content and the small particle diameter is removed; the slag can be better dispersed, the particle diameter is large, the water content is low, the slag can be directly dispersed through scraping teeth, and after the slag is dispersed and dried, follow-up separation equipment can more completely pick out the internal aluminum slag.

Description

Technical Field

[0001] The present invention relates to the field of reuse of slag waste, and specifically to an aluminum metal extraction system for refuse incineration slag. Background Art

[0002] Slag belongs to general solid waste that can be resourcefully utilized. If it enters a landfill for disposal as general solid waste, it will increase the pressure on the tight landfill capacity. The resourceful utilization of slag is a new research topic for the treatment of refuse incineration slag at the present stage. After being processed, slag can be used as building materials, such as making high-strength non-fired bricks, which is a new way for the resourceful utilization of slag. The comprehensive treatment and resourceful utilization project of slag achieves the goal of turning waste into treasure. Since the slag after refuse incineration mainly consists of molten slag, ceramic fragments, glass, sand, and some other incombustible substances and unburned organic matter. The slag after technical treatment is suitable for making non-fired bricks or other building materials and has certain recycling value. The aluminum contained in the slag can be separated by an eddy current separator. Waste aluminum is a precious resource. The effective recovery and utilization of waste aluminum are of special significance for developing circular economy, saving resources and energy, and reducing greenhouse gas and harmful substance emissions. The recycled aluminum industry is an essential part of the world aluminum industry and an indispensable link for the sustainable development of the world aluminum industry, with huge market potential and development prospects. Waste aluminum can also be sold to smelters for resource recycling.

[0003] Since the density of aluminum material is only slightly greater than that of non-metallic slag sand material, it is very difficult to separate the aluminum material from the sand material through the buoyancy separation process. When the aluminum material passes through a non-ferrous metal eddy current separator, eddy currents will be generated, generating a reverse magnetic force, which repels the magnetic field of the eddy current separator itself, so that it flows out rapidly from the slag. If it is not processed through the aluminum separation system process, when making bricks from the purified sand material, the bricks will crack due to the oxidation reaction of the aluminum material.

[0004] However, the current aluminum removal systems generally directly process the slag after water washing. At this time, the slag has a certain water content, and aluminum flakes, filter residues, particles, and powders are concentrated together. If a single eddy current separator is directly used later, it is still very difficult to separate many filter residues. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides an aluminum metal extraction system for refuse incineration slag, which solves the problems put forward in the above background art.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: an aluminum metal extraction system for waste incineration furnace slag, including a primary dewatering screen and a secondary dewatering screen. After the primary dewatering screen separates the 32μm - 75μm water-sand mixture, the remaining furnace slag is transferred to the secondary dewatering screen. Subsequently, the secondary dewatering screen divides the furnace slag into sand materials of 75μm - 3mm, 3mm - 40mm, and sand materials larger than 40mm; it also includes three groups of eddy current separators, which are respectively used to process three different specifications of sand materials.

[0007] Preferably, each of the eddy current separators includes a separation device and a drying, dispersing, and vibrating device. The drying, dispersing, and vibrating device is installed at the feeding end of the separation device, used to receive the discharge from the secondary dewatering screen, and used to separate and dehydrate the received sand materials.

[0008] Preferably, the drying, dispersing, and vibrating device includes a feeding plate, a top plate, and a drying component. The feeding plate is inclined, divided into a high end and a low end. The top plate is horizontally arranged above the feeding plate, and the top plate is fixedly suspended from the feeding plate. There are two groups of drying components, which are respectively installed on the upper surface of the top plate and the bottom surface of the feeding plate, used to transfer dry hot air between the feeding plate and the top plate; The drying, dispersing, and vibrating device also includes a vibrating part and a separating part. The vibrating part is used to install the feeding plate and the top plate and cause them to vibrate. The separating part is arranged between the top plate and the feeding plate.

[0009] Preferably, the vibrating part includes a bottom beam and two groups of longitudinal beams. There are two bottom beams. One group of longitudinal beams has a spring fixed to its bottom. The spring is fixed to the bottom beam, and this group of longitudinal beams is fixed to the high end of the feeding plate; The bottom of the other group of longitudinal beams is fixed with a rubber column and a slider. A square sleeve and a vibrator are fixed to the corresponding bottom beam. The slider is arranged in the square sleeve and is slidably connected to it. The vibrator is installed at the bottom of the square sleeve to vibrate the slider, and this group of longitudinal beams is fixed to the low end of the feeding plate; The top plate is jointly fixed by four longitudinal beams.

[0010] Preferably, the separating part includes two groups of scraping teeth and a balance frame fixedly connecting the two groups of scraping teeth.

[0011] Preferably, for one of the eddy current separators, its balance frame is fixedly installed on the longitudinal beam, and the feeding plate corresponds to the outlet for sand materials larger than 40mm.

[0012] Preferably, for the other two eddy current separators, their balance frames are fixedly installed on the bottom beam, and the feeding plates respectively correspond to the 75μm - 3mm sand materials and the 3mm - 40mm sand materials.

[0013] Preferably, a number of air holes are provided on both the feeding plate and the top plate. The drying component includes an enclosing cover and a dry hot air pipe. The enclosing cover covers the air holes, and the dry hot air pipe is communicated with the inside of the enclosing cover.

[0014] Preferably, one end of the scraping teeth facing the high end of the blanking plate is a tip structure, and each group of scraping teeth is a plurality of equally spaced, and two groups of scraping teeth are arranged staggeredly.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the aluminum metal extraction system for waste incineration furnace slag, slag with different diameters can be sent to different eddy current separators for treatment. The drying, dispersing and vibrating device can dry the slag, and the scraping teeth and vibration can disperse the water-containing slag. When dispersing the slag with high water content and small particle diameter, the blanking plate vibrates and impacts the scraping teeth, which can better disperse the slag. For slag with large particle diameter and low water content, it can be directly dispersed by the scraping teeth. After being dispersed and dried, the subsequent sorting equipment can pick out the internal aluminum slag more completely.

[0016] 2. In the aluminum metal extraction system for waste incineration furnace slag, the use of three groups of eddy current separators can cover all diameters of sand particles. Therefore, compared with the traditional aluminum sorting system, the efficiency of extracting aluminum is higher, and there is no need for secondary repeated sorting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the extraction system of the present invention; Figure 2 It is a first view of the structure of the eddy current separator of the present invention; Figure 3 It is a second view of the structure of the eddy current separator of the present invention; Figure 4 It is a front view of the eddy current separator of the present invention; Figure 5 It is a structural diagram of the drying, dispersing and vibrating device of the present invention; Figure 6 It is a structural exploded view of the drying, dispersing and vibrating device of the present invention; Figure 7 It is a structural diagram of the drying component of the present invention; Figure 8 It is a structural diagram of the separating member of the present invention; Figure 9 It is a structural diagram of the vibrating member of the present invention.

[0018] In the figure: 1, sorting equipment; 2, drying, dispersing and vibrating device; 201, blanking plate; 202, top plate; 203, drying component; 2031, closed cover; 2032, dry hot air pipe; 204, vibrating member; 2041, bottom beam; 2042, longitudinal beam; 2043, spring; 2044, rubber column; 2045, slider; 2046, square sleeve; 2047, vibrator; 205, separating member; 2051, scraping teeth; 2052, balance frame; 206, air hole. DETAILED DESCRIPTION OF THE INVENTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0020] It should be noted that all the directional indications in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] In the present application, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0022] In addition, in the present application, the descriptions such as "first", "second", etc. are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0023] As Figures 1-9 shown, the aluminum metal extraction system for waste incineration slag includes a primary dewatering screen and a secondary dewatering screen. After the primary dewatering screen separates the water-sand mixture of 32μm - 75μm, the remaining slag is transferred to the secondary dewatering screen. Subsequently, the secondary dewatering screen divides the slag into sand materials of 75μm - 3mm, sand materials of 3mm - 40mm, and sand materials larger than 40mm. It further includes three groups of eddy current separators, which are respectively used to process three different specifications of sand materials.

[0024] Since the density of aluminum material is only slightly greater than that of non-metallic slag sand material, it is very difficult to separate aluminum material from sand material by the buoyancy separation process. If it is not processed through the aluminum separation system process, when the purified sand material is used to make bricks, the brick body will crack due to the oxidation reaction of aluminum material. Therefore, the sand materials with particle sizes of 32 µm - 75 µm, 75 µm - 3 mm, 3 mm - 40 mm and the >40 mm slag heads (bone materials) in the above sand material particle size classification and dehydration system process are respectively recycled for aluminum material by the eddy current separator of this aluminum separation equipment.

[0025] When aluminum material passes through the non-ferrous metal eddy current separator, eddy currents will be generated, generating a reverse magnetic force field, which repels the magnetic field of the eddy current separator itself, so that it flows out rapidly from the slag. Feeding port 1: The clean sand materials are respectively sorted through the four-stage aluminum separation system process to separate three different particle sizes of sand materials of 32 µm - 75 µm, 75 µm - 3 mm, 3 mm - 40 mm and >40 mm slag heads.

[0026] 1. The >40 mm slag heads (bone materials) are transported back to the slag yard by a loader for the repeated crushing process to make the particle diameter of the slag heads less than 15 mm (i.e., the product: coarse aggregate 3 mm - 40 mm), which is used as the main additive for making bricks.

[0027] The three different particle sizes of product sand materials of 32 µm - 75 µm, 75 µm - 3 mm, 3 mm - 40 mm (i.e., the finished fine materials: 32 µm - 2 mm, sand materials: 2 mm - 6 mm, coarse aggregate: 3 mm - 40 mm) can be used as follows in the table: ; In an optional embodiment, the eddy current separator includes a sorting device 1 and a drying, dispersing and vibrating device 2. The drying, dispersing and vibrating device 2 is installed at the feeding end of the sorting device 1, used to receive the discharge of the secondary dehydration screen, and used to separate and dehydrate the received sand materials.

[0028] In this embodiment, the sorting device 1 is a subsequent device of the existing eddy current separator, including a feeding system and a permanent magnet system. When the high-speed rotating permanent magnet drum generates an alternating magnetic field, aluminum metal will generate eddy currents when passing through the magnetic field. These eddy currents will generate a magnetic field opposite to the original magnetic field, thereby generating a repulsive force on the metal particles. The non-metallic materials fall freely, while the non-ferrous metals are thrown farther due to the repulsive force, realizing separation.

[0029] Different from the prior art, the existing vibrating feeding device is replaced with the drying, dispersing and vibrating device 2.

[0030] In an optional embodiment, the drying, dispersing and vibrating device 2 includes a blanking plate 201, a top plate 202 and a drying assembly 203. The blanking plate 201 is inclined and is divided into a high end and a low end. The top plate 202 is horizontally arranged and is located above the blanking plate 201. The top plate 202 is fixedly suspended from the blanking plate 201. There are two groups of drying assemblies 203, which are respectively installed on the upper surface of the top plate 202 and the bottom surface of the blanking plate 201 for transferring hot dry air between the blanking plate 201 and the top plate 202. The drying, dispersing and vibrating device 2 further includes a vibrating member 204 and a separating member 205. The vibrating member 204 is used to mount the blanking plate 201 and the top plate 202 and to cause the two to vibrate. The separating member 205 is arranged between the top plate 202 and the blanking plate 201.

[0031] In this embodiment, the blanking plate 201 has a U-shaped structure, and a blanking port is provided at the high end for receiving the sand material transmitted from the dehydration screen. The drying assembly 203 is connected to the plant heating equipment or uses an external ceramic heater to provide heat. The hot dry air brought by the two groups of drying assemblies 203 acts together between the top plate 202 and the blanking plate 201, so that the sand material passing between the two can be further dewatered. In this process, in order to save energy, it is not necessary to completely dry the sand material, and only the moisture on its surface needs to be removed, which is convenient for later turning of the material.

[0032] In an optional embodiment, the vibrating member 204 includes a bottom beam 2041 and two groups of longitudinal beams 2042. There are two bottom beams 2041. A spring 2043 is fixed to the bottom of one group of longitudinal beams 2042. The spring 2043 is fixed to the bottom beam 2041, and this group of longitudinal beams 2042 is fixed to the high end of the blanking plate 201. A rubber column 2044 and a slider 2045 are fixed to the bottom of the other group of longitudinal beams 2042. A square sleeve 2046 and a vibrator 2047 are fixed to the corresponding bottom beam 2041. The slider 2045 is arranged in the square sleeve 2046 and is slidably connected thereto. The vibrator 2047 is installed at the bottom of the square sleeve 2046 for vibrating the slider 2045, and this group of longitudinal beams 2042 is fixed to the low end of the blanking plate 201. The top plate 202 is jointly fixed by the four longitudinal beams 2042.

[0033] In this embodiment, the rubber column 2044 is a rubber pad, which can reduce the noise generated by the equipment during vibration. With the restriction of the slider 2045 and the square sleeve 2046, the equipment can operate for a longer time, and the vibrator 2047 can be protected, and the service life of the vibrator 2047 can be extended.

[0034] In an optional embodiment, the separating member 205 includes two groups of scraping teeth 2051 and a balance frame 2052 fixedly connecting the two groups of scraping teeth 2051.

[0035] In this embodiment, the balance frame 2052 is used to fixedly connect two sets of scraping teeth 2051, so that the two sets of scraping teeth 2051 are distributed according to the inclination angle of the blanking plate 201.

[0036] In an alternative embodiment, for one of the eddy current separators, its balance frame 2052 is fixedly installed on the longitudinal beam 2042, and the blanking plate 201 corresponds to the sand material outlet with a size greater than 40 mm.

[0037] In this embodiment, when the balance frame 2052 is installed on the longitudinal beam 2042, when the vibrator 2047 vibrates the blanking plate 201 and the longitudinal beam 2042, it can drive the scraping teeth 2051 and the balance frame 2052 to vibrate simultaneously. During this process, the large particle sand materials with a size above 40 mm will be dispersed with the vibration, and the dispersed sand materials will impact the scraping teeth 2051, so that the aluminum metal wrapped therein can be better separated from the sand materials.

[0038] In an alternative embodiment, for the other two eddy current separators, their balance frames 2052 are fixedly installed on the bottom beam 2041, and the blanking plates 201 correspond to the sand materials with sizes of 75 μm - 3 mm and 3 mm - 40 mm respectively.

[0039] In this embodiment, the small diameter sand materials generally have a high water content and the water is not easy to be removed. Therefore, when vibrating, the blanking plate 201 will frequently move away from and close to the scraping teeth 2051. Thus, the scraping teeth 2051 can break up the agglomerated small particle sand materials. After being dispersed, they can be better dried by hot air. The hot air can act on the small particle sand materials, and the removal rate will be higher when removing aluminum metal subsequently.

[0040] In an alternative embodiment, a plurality of air holes 206 are provided on both the blanking plate 201 and the top plate 202. The drying assembly 203 includes an enclosing cover 2031 and a dry hot air pipe 2032. The enclosing cover 2031 covers the air holes 206, and the dry hot air pipe 2032 is communicated with the inside of the enclosing cover 2031.

[0041] In this embodiment, by blowing air into the dry hot air pipe 2032 using external wind force, the blowing air will be concentrated in the enclosing cover 2031 and then pass through the air holes 206 from inside the enclosing cover 2031 to act on the sand materials. The diameter of the air holes 206 is relatively small, generally smaller than the diameter of the sand materials, and the air outlet is not affected at the same time.

[0042] In an alternative embodiment, the end of the scraping tooth 2051 facing the high end of the blanking plate 201 is a tip structure. Each set of scraping teeth 2051 is composed of a plurality of equally spaced ones, and the two sets of scraping teeth 2051 are staggered.

[0043] In this embodiment, the outside of the scraping teeth 2051 is covered with an alloy wear-resistant material, and it is not easy to have large-area wear even when in contact with abrasive materials for a long time. The staggered scraping teeth 2051 can better disperse the materials.

[0044] During use, slag with different diameters can be sent to different eddy current separators for treatment. The drying, dispersing and vibrating device 2 can dry the slag. The scraping teeth 2051 and vibration can disperse the water-containing slag. When dispersing slag with a high water content and a small particle diameter, the feeding plate 201 vibrates and impacts the scraping teeth 2051, which can better disperse the slag. For slag with a large particle diameter and a low water content, it can be directly dispersed by the scraping teeth 2051. After being dispersed and dried, the subsequent sorting device 1 can more completely pick out the aluminum slag inside.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0046] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0047] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Aluminum metal extraction system for waste incineration furnace slag, characterized in that: It includes a primary dewatering screen and a secondary dewatering screen. After the primary dewatering screen separates the water-sand mixture of 32μm - 75μm, the remaining slag is transferred to the secondary dewatering screen. Subsequently, the secondary dewatering screen divides the slag into sand materials of 75μm - 3mm, 3mm - 40mm, and sand materials larger than 40mm; It also includes three sets of eddy current separators, which are respectively used to process three different specifications of sand materials.

2. The aluminum metal extraction system for waste incineration furnace slag according to claim 1, characterized in that: Each of the eddy current separators includes a separation device (1) and a drying, dispersing, and vibrating device (2). The drying, dispersing, and vibrating device (2) is installed at the feeding end of the separation device (1) and is used to receive the discharge from the secondary dewatering screen and separate and dehydrate the received sand materials.

3. The aluminum metal extraction system for waste incineration furnace slag according to claim 2, wherein: The drying, dispersing, and vibrating device (2) includes a blanking plate (201), a top plate (202), and a drying component (203). The blanking plate (201) is inclined and is divided into a high end and a low end. The top plate (202) is horizontally arranged and is above the blanking plate (201). The top plate (202) is fixedly suspended from the blanking plate (201). There are two sets of drying components (203), which are respectively installed on the upper surface of the top plate (202) and the bottom surface of the blanking plate (201) and are used to transfer hot dry air between the blanking plate (201) and the top plate (202); The drying, dispersing, and vibrating device (2) also includes a vibrating part (204) and a separating part (205). The vibrating part (204) is used to install the blanking plate (201) and the top plate (202) and to cause them to vibrate. The separating part (205) is arranged between the top plate (202) and the blanking plate (201).

4. The aluminum metal extraction system for waste incineration furnace slag according to claim 3, characterized in that: The vibrating part (204) includes a bottom beam (2041) and two sets of longitudinal beams (2042). There are two bottom beams (2041). Springs (2043) are fixed at the bottom of one set of longitudinal beams (2042). The springs (2043) are fixed to the bottom beam (2041), and this set of longitudinal beams (2042) is fixed to the high end of the blanking plate (201); At the bottom of the other set of longitudinal beams (2042), a rubber column (2044) and a slider (2045) are fixed. A square sleeve (2046) and a vibrator (2047) are fixed to the corresponding bottom beam (2041). The slider (2045) is arranged in the square sleeve (2046) and is slidably connected to it. The vibrator (2047) is installed at the bottom of the square sleeve (2046) to vibrate the slider (2045), and this set of longitudinal beams (2042) is fixed to the low end of the blanking plate (201); The top plate (202) is jointly fixed by four longitudinal beams (2042).

5. The aluminum metal extraction system for waste incineration furnace slag according to claim 4, characterized in that: The separating part (205) includes two sets of scraping teeth (2051) and a balance frame (2052) that fixedly connects the two sets of scraping teeth (2051).

6. The aluminum metal extraction system for waste incineration slag according to claim 5, characterized in that: For one of the eddy current separators, its balance frame (2052) is fixedly installed on the longitudinal beam (2042), and the blanking plate (201) corresponds to the outlet for sand materials larger than 40mm.

7. The aluminum metal extraction system for waste incineration furnace slag according to claim 5, wherein: For the other two eddy current separators, their balance frames (2052) are fixedly installed on the bottom beam (2041), and the blanking plates (201) respectively correspond to the sand materials of 75μm - 3mm and 3mm - 40mm.

8. The aluminum metal extraction system for waste incineration furnace slag according to claim 2, characterized in that: A plurality of air holes (206) are provided on both the blanking plate (201) and the top plate (202). The drying assembly (203) includes an enclosing cover (2031) and a dry hot air duct (2032). The enclosing cover (2031) covers the air holes (206), and the dry hot air duct (2032) is in communication with the interior of the enclosing cover (2031).

9. The aluminum metal extraction system for waste incineration furnace slag according to claim 5, characterized in that: One end of the scraping teeth (2051) facing the high end of the blanking plate (201) is a tip structure. Each group of scraping teeth (2051) has a plurality of equally spaced distributions, and two groups of scraping teeth (2051) are staggered.

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