Wet-process comprehensive utilization system for household garbage incineration power generation slag

Abstract

The invention relates to a wet-process comprehensive utilization system for household garbage incineration power generation slag, and relates to the technical field of slag reutilization. Comprising a crushing system, a magnetic separation system, a screening system, a dehydration system, a separation system and a recovery system, the crushing system conveys the received furnace slag to a feeding rotary screen through a feeding conveying belt, the furnace slag is screened into coarse materials and fine materials, the coarse materials are fed into a crusher through a hanging sorting machine, and the coarse materials are fed into the feeding conveying belt for circulation after being crushed; the magnetic separation system is used for separating magnetic materials from coarse materials output by the feeding drum screen through an electromagnetic iron remover; the screening system is used for sorting through a first jigger and a second jigger; the dewatering system is cleaned through a spiral sand washer; the sorting system is used for sorting aluminum materials and tailings through an eddy current sorting machine, the aluminum materials are fed into an aluminum pool, and the tailings are recycled; the recycling system is used for treating the sewage to obtain circulating water. The invention solves the problems of low resource utilization rate and serious environmental pollution in the traditional slag treatment mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slag recycling, in particular to a wet comprehensive utilization system for slag of household garbage incineration power generation. BACKGROUND

[0002] In the current field of household garbage treatment, incineration power generation is a common and effective way, and the treatment of the slag generated thereby is also of great concern.

[0003] In the prior art, the treatment of the slag of household garbage incineration power generation is mostly carried out in a relatively simple and extensive manner, such as direct landfill or only separating part of the recyclable materials after preliminary screening, and landfilling the remaining part as ordinary waste. This approach not only wastes many recyclable resources in the slag, such as some metal components and valuable minerals contained therein, which cannot be effectively extracted and utilized, but also occupies valuable land resources and poses potential pollution risks to the land environment, such as causing changes in soil properties.

[0004] In addition, some technologies that attempt to comprehensively utilize the slag often focus on only one single link, such as removing part of the impurities in the slag through a simple water washing process, but lack a complete and efficient system that can comprehensively and orderly separate, purify and subsequently convert and utilize different components in the slag, so that the degree and efficiency of the comprehensive utilization of the slag are at a low level, and the maximum utilization of resources and higher economic benefits cannot be achieved. SUMMARY

[0005] In view of the above-mentioned deficiencies in the prior art, the present application provides a wet comprehensive utilization system for slag of household garbage incineration power generation, which solves the problems of low resource utilization rate and large environmental pollution in the traditional slag treatment method; by providing a processing system and equipment that are associated with each other, the slag is subjected to crushing, magnetic separation, screening, dewatering, separation and recovery treatment, the magnetic substances, non-ferrous metals and sand materials in the slag are effectively separated and recycled, the resourceization, reduction and harmlessness of the slag treatment are achieved, the environmental pressure generated by the household garbage incineration power generation is reduced, the resource utilization efficiency is improved, and economic and environmental dual benefits are created.

[0006] The specific technical solutions are as follows:

[0007] A wet comprehensive utilization system for slag of household garbage incineration power generation, comprising:

[0008] A crushing system, which is used to screen the received slag into coarse materials and fine materials through a feeding conveyor belt and a feeding drum screen, and circulate the coarse materials into a feeding conveyor belt after being sent into a crusher by a hanging separator and crushed;

[0009] The magnetic separation system separates the magnetic material from the coarse material output by the feeding roller screen through an electromagnetic iron separator, and sends the magnetic material to a punching machine through an iron conveying belt, and further screens the magnetic material through an upward suction type magnetic separator, and then sends the magnetic material to a rolling iron cage, and the remaining material is sent to the first jigging machine of the screening system; the fine material output by the feeding roller screen is separated from the magnetic material by a permanent magnet roller and sent to the iron conveying belt, and the remaining material is sent to a sanding machine through a sand conveying belt, and further screened for magnetic material through a first wet magnetic separator, and then the magnetic material is sent to a rolling iron cage, and the remaining material is sent to a second jigging machine of the screening system; the fine material screened by the rolling iron cage is sent to a second wet magnetic separator, the magnetic material obtained by the magnetic screen is sent to an iron powder pool, and the remaining material after the magnetic screen is sent to the screening system; the rolling iron cage selects iron pieces and sends them to an iron pool;

[0010] The screening system separates the upflow material and the conical hopper material through the first jigging machine and the second jigging machine, sends the upflow material to the spiral sand washer of the dehydration system, and sends the conical hopper material to the corresponding first shaking table and second shaking table to shake out non-ferrous metal materials, and the non-ferrous metal materials are sent to a non-ferrous metal collection pool; other materials shaken out by the first shaking table and the second shaking table are sent to the recycling system;

[0011] The dehydration system cleanses the obtained suspended material by a spiral sand washer, separates garbage and sewage material from the floating cage, and sends the obtained sand material to a grading roller screen to divide it into three levels of material smaller than 3mm, 3-12mm and larger than 12mm, and sends it to the sorting system; the residue screened by the grading roller screen is sent to a dehydration screen, which screens out recyclable sand and sewage material; the sewage material of the floating cage and the dehydration screen is sent to the recycling system;

[0012] The sorting system separates aluminum material and tailings through an eddy current separator, and sends the aluminum material to an aluminum pool, and the tailings are recycled;

[0013] The recycling system deposits the sewage material, sends the obtained sediment sand material to the dehydration screen of the dehydration system, and performs solid-liquid separation on the deposited sewage to obtain circulating water.

[0014] Further to the above scheme, the material smaller than 3mm output by the grading roller screen is dehydrated into fine sand by the dehydration screen and directly conveyed to a sand yard; the material larger than 12mm and 3-12mm is respectively extracted by a single-layer eddy current separator and a double-layer eddy current separator to obtain aluminum material, and the tailings are sent back to the crusher by a conveying belt for further processing.

[0015] Further to the above scheme, the screening system further includes a third jigging machine for receiving tail sand of the shaking table after deposition by the recycling system, the third jigging machine sends the upflow material after screening to the spiral sand washer of the dehydration system, and sends the conical hopper material to the copper head machine of the magnetic separation system for crushing, and the crushed material is sent to the second shaking table; the second jigging machine sends the channeling material to the copper head machine.

[0016] Further, the feeding roller screen further comprises a fixed frame, a coaxial outer roller and a central shaft, the outer roller wall surface is uniformly distributed with sieve holes, and the sieve hole diameter is 8-12 mm; the central shaft is fixedly connected with a reverse spiral guide plate along the axial direction, the reverse spiral guide plate has an inclination angle of 25-30°; the reverse spiral guide plate is located at the inlet section of the outer roller; the outer roller is connected with a first driving gear, the end portion of the central shaft is connected with a second driving gear, the first driving gear and the second driving gear are both in transmission connection with the output end of a differential, and the input end of the differential is connected with a driving motor; the driving motor synchronously drives the outer roller to rotate at a first rotating speed and drives the central shaft to rotate at a second rotating speed in the opposite direction through the differential, and the difference between the first rotating speed and the second rotating speed is controlled to be 1.8-2.2 r / min.

[0017] Further, the two ends of the central shaft are connected with the mounting seat of the fixed frame through bearings, the bearing outer ring is sleeved with a polyurethane buffer sleeve, and the polyurethane buffer sleeve is fixedly connected with the mounting seat; an annular positioning sleeve is arranged between the bearing outer ring and the polyurethane buffer sleeve, and the outer peripheral wall of the annular positioning sleeve is vulcanized with the inner wall of the polyurethane buffer sleeve to form cladding fixation.

[0018] Further, the material receiving surface of the reverse spiral guide plate is processed with a continuous wave-shaped flow guide groove, and the flow guide groove periodically undulates along the extension direction of the spiral guide plate.

[0019] Further, the outlet section of the outer roller is hingedly connected with an adjustable flow guide plate, and the adjustable flow guide plate is arranged along the inner side edge of the outer roller in the axial direction; the flow guide plate is dynamically adjusted in opening and closing angle through an angle adjusting mechanism, and the angle adjusting mechanism comprises a servo motor, a mounting frame and an angle encoder; the mounting frame is fixed on the outer side of the outlet section of the outer roller, the servo motor is installed on the mounting frame and is coaxially connected with the hinge shaft of the adjustable flow guide plate; the angle encoder is arranged at the output shaft of the servo motor; and the adjustable angle range of the adjustable flow guide plate is 5°-30° relative to the radial direction of the outer roller.

[0020] Further, the material receiving surface of the reverse spiral guide plate is processed with a continuous wave-shaped flow guide groove, and the flow guide groove periodically undulates along the extension direction of the spiral guide plate.

[0021] Further, the electromagnetic iron remover comprises, in sequence along the material conveying direction:

[0022] a primary permanent magnet roller, neodymium iron boron magnetic blocks are arranged in a fan shape on the outer side of the cylinder wall of the primary permanent magnet roller, the surface magnetic field strength is 0.45 to 0.55 tesla, and the cylinder body rotating speed is adjustable in the range of 10-20 r / min;

[0023] The secondary electromagnetic separator comprises a liftable magnetic pole plate and a pulse power control module, the magnetic pole plate spacing is adjusted by a servo motor, and the adjustment range is 5-15mm.

[0024] The tertiary vertical magnetic filter comprises a cylinder, a distance-adjustable magnetic grid and a non-conducting baffle plate arranged in the cylinder, a tungsten carbide wear-resistant layer coated on the surface of the magnetic grid, and the magnetic grid and the non-conducting baffle plate are arranged in a 45° cross arrangement, and an annular strong magnet with an axial magnetic field gradient of greater than or equal to 5T / m is embedded in the bottom conical slag hopper.

[0025] Further to the above scheme, the distance between the magnetic grids of the tertiary vertical magnetic filter is adjusted by an electric push rod linkage, the stroke of the electric push rod is linearly and positively correlated with the current intensity of the secondary electromagnetic separator, and the control signal of the electric push rod and the real-time feedback data of the metal detector form a closed-loop control circuit through a PLC controller, and the metal detector is arranged at the outlet end of the tertiary vertical magnetic filter.

[0026] Compared with the prior art, the beneficial effects of the present application are:

[0027] The present application realizes efficient comprehensive utilization of household waste incineration power plant slag through multi-link cooperative operation. In the material separation aspect, the crushing system, the magnetic separation system and the screening system cooperate with each other to accurately separate valuable materials such as iron parts, non-ferrous metals and aluminum materials, thereby improving the resource recovery rate; the dehydration system and the separation system perform grading treatment and reselection on sand materials and other materials, thereby producing finished sand of different specifications and increasing the product added value. At the same time, the recovery system processes sewage materials to obtain circulating water, thereby effectively reducing water resource waste and environmental pollution, and realizing resource recycling and green environmental protection in the slag treatment process. In addition, the special structure design of each device in the system, such as the feeding drum screen with a special structure and the electromagnetic iron remover, further improves the separation efficiency and the service life of the equipment, and reduces the operation cost. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a functional block diagram of the present application;

[0029] Figure 2 is a structure diagram of the feeding drum screen of the present application; Figure 3 is a schematic diagram of the internal structure of the feeding drum screen of the present application.

[0030] 1-outer drum, 2-center shaft, 3-fixed frame, 4-screen hole, 5-driving motor, 6-reverse spiral guide plate, 7-flow guide plate, 8-servo motor, 9-mounting frame. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in combination with the drawings of the specification, so that the purpose, technical scheme and technical effect of the present application are more clearly presented.

[0032] As Figure 1 shown, the application discloses a kind of domestic waste incineration power generation slag wet comprehensive utilization system, including crushing system, magnetic separation system, screening system, dehydration system, sorting system and recovery system.Crushing system is used to screen slag into coarse material, fine material, and coarse material is recycled after crushing.Magnetic separation system is used to separate magnetic material in coarse material and fine material, and magnetic material is sent to rolling iron cage after being treated respectively, and the rest material is sent to screening system.Screening system is used to separate material by jigging machine and shaking table, and obtain upflow material, conical hopper material and non-ferrous metal, and other substances are sent to recovery system.Dehydration system is used to wash and screen material, separate garbage, sewage and sand material of different particle sizes, and slag material and sewage material are sent to recovery system.Sorting system is used to separate aluminum material and tailings by eddy current separator and treat them respectively.Recovery system is used to deposit sewage material, separate sediment sand and circulating water, realize resource recovery and water circulation.

[0033] In the crushing system, the received slag is conveyed to the feeding drum screen by the feeding conveyor belt and is screened into coarse material and fine material, the coarse material is sent to the crusher by the hanging separator, and after crushing, it is sent to the feeding conveyor belt for circulation.

[0034] In the magnetic separation system, the coarse material output from the feeding drum screen is separated from the magnetic material by the electromagnetic iron separator, and is sent to the iron beating machine by the iron conveying belt, and after further screening of the magnetic material by the upward suction type magnetic separator, the magnetic material is sent to the rolling iron cage, and the rest is sent to the first jigging machine of the screening system.The fine material output from the feeding drum screen is separated from the magnetic material by the permanent magnet drum and is sent to the iron conveying belt, and the rest material is sent to the sanding machine by the sand material conveying belt, and after further screening of the magnetic material by the first wet type magnetic separator, the magnetic material is sent to the rolling iron cage, and the rest is sent to the second jigging machine of the screening system.The fine material screened out by the rolling iron cage is sent to the second wet type magnetic separator, the magnetic material obtained by the magnetic screen is sent to the iron powder pool, and the rest material after the magnetic screen is sent to the screening system;The iron pieces selected by the rolling iron cage are sent to the iron pool.

[0035] The screening system separates the upflow material and the conical hopper material by the first jigging machine and the second jigging machine, sends the upflow material to the spiral sand washer of the dehydration system, and sends the conical hopper material to the corresponding first shaking table and second shaking table to shake out non-ferrous metal material, and sends the non-ferrous metal material to the non-ferrous metal collection pool;The other substances shaken out by the first shaking table and the second shaking table are sent to the recovery system.

[0036] In the dehydration system, the suspended material obtained by the spiral sand washer is separated from the garbage and sewage material by the floating cage, and the sand material is sent to the grading drum screen to be screened into three levels of material smaller than 3mm, 3-12mm and larger than 12mm, and is sent to the sorting system.The slag screened out by the grading drum screen is sent to the dehydration screen, and the recyclable sand material and sewage material are screened out;The sewage material of the floating cage and the dehydration screen is sent to the recovery system.

[0037] The material less than 3mm output by the grading drum screen is dewatered into fine sand by the dewatering screen and directly transported to the sand yard; the material greater than 12mm and the material between 3-12mm are respectively extracted by the single-layer eddy current separator and the double-layer eddy current separator, and the tailings are sent back to the crusher by the conveyor belt for reprocessing.

[0038] In the sorting system, the aluminum material and the tailings are sorted by the eddy current separator, the aluminum material is sent into the aluminum pool, and the tailings are recycled.

[0039] In the recycling system, the sediment sand material is obtained by sedimentation of the sewage material, the dewatering screen of the dewatering system, and the sewage after sedimentation is solid-liquid separated to obtain the circulating water.

[0040] In the above scheme, the present application separates different materials based on the difference in physical properties of the slag. The crushing system uses mechanical crushing and screening principles to preliminarily process the slag into materials of different particle sizes; the magnetic separation system separates magnetic materials through electromagnetic iron separators, permanent magnet rollers, etc. according to the force characteristics of magnetic materials in a magnetic field; the screening system uses jiggers and shaking tables to separate materials according to the differences in density and particle size; the dewatering system uses spiral sand washers, dewatering screens, etc. to realize the dewatering and classification of materials through mechanical force and gravity; the sorting system uses eddy current separators to separate non-ferrous metals such as aluminum based on the principle of electromagnetic induction; the recycling system uses sedimentation and solid-liquid separation principles to process sewage materials, realizing the recycling of water resources. Each system cooperates with each other to form a complete slag comprehensive treatment system.

[0041] Here, the screening system further includes a third jigging machine for receiving the tailings of the shaking table after sedimentation in the recycling system, the third jigging machine screen sends the selected upflow material to the spiral sand washer of the dewatering system, and the conical hopper material is sent to the copper head machine of the magnetic separation system for crushing, and the crushed material is sent to the second shaking table; the second jigging machine sends the trough material to the copper head machine.

[0042] Here, the screening system further includes a third jigging machine for receiving the tailings of the shaking table after sedimentation in the recycling system, the third jigging machine screen sends the selected upflow material to the spiral sand washer of the dewatering system, and the conical hopper material is sent to the copper head machine of the magnetic separation system for crushing, and the crushed material is sent to the second shaking table; the second jigging machine sends the trough material to the copper head machine. Figures 2-3As shown, the feeding drum screen includes a fixed frame 3, a coaxial outer drum 1 and a central shaft 2, the wall surface of the outer drum 1 is uniformly distributed with sieve holes 4, the diameter of the sieve holes 4 is 8-12 mm. The central shaft 2 is fixedly connected with a reverse spiral guide plate 6 along the axial direction, the inclination angle of the reverse spiral guide plate 6 is 25-30°. The reverse spiral guide plate 6 is located at the inlet section of the outer drum 1; the outer drum 1 is connected with a first driving gear, the end of the central shaft 2 is connected with a second driving gear, the first driving gear and the second driving gear are both drivingly connected with the output end of a differential, and the input end of the differential is connected with a driving motor 5. The driving motor 5 synchronously drives the outer drum 1 to rotate at a first rotating speed and drives the central shaft 2 to rotate at a second rotating speed in the opposite direction, wherein the difference between the first rotating speed and the second rotating speed is controlled to be 1.8-2.2 r / min. The differential is used to rotate the outer drum 1 and the central shaft 2 in coordination, that is, the difference between the first rotating speed and the second rotating speed is controlled to be 1.8-2.2 r / min, for example, the difference between the first rotating speed and the second rotating speed is controlled to be 2 r / min.

[0043] In order to improve the screening efficiency and reliability of the feeding drum screen, solve the problems of material blockage and insufficient screening in the ordinary screening process, the structure of the feeding drum screen is optimized, including the coaxial outer drum 1, the central shaft 2 and the reverse spiral guide plate 6, the diameter of the sieve hole 4, the rotating speed difference and the inclination angle are designed, and the polyurethane buffer sleeve and the adjustable guide plate 7 are arranged; in this way, the material can be fully dispersed by the reverse rotating outer drum 1 and the spiral guide plate during screening, and the sieve hole 4 is prevented from being blocked. However, the differential may cause shaking in the rotating coordination, in order to avoid the shaking of the reverse spiral guide plate 6 affecting the coordination, the polyurethane buffer sleeve is used to protect the central shaft 2.

[0044] The two ends of the central shaft 2 are connected with the mounting seat of the fixed frame 3 through bearings, the outer ring of the bearing is sleeved with a polyurethane buffer sleeve, and the polyurethane buffer sleeve is fixedly connected with the mounting seat; an annular positioning sleeve is arranged between the outer ring of the bearing and the polyurethane buffer sleeve, and the outer peripheral wall of the annular positioning sleeve is vulcanized with the inner wall of the polyurethane buffer sleeve to form cladding fixation. The material receiving surface of the reverse spiral guide plate 6 is processed with a continuous wavy guide groove, and the guide groove is periodically undulating along the extension direction of the spiral guide plate.

[0045] Here, the outlet section of the outer drum 1 is hinged with an adjustable guide vane 7, which is arranged axially along the inner side of the outer drum 1. The guide vane 7 is dynamically adjusted in opening and closing angle by an angle adjusting mechanism, which includes a servo motor 8, a mounting bracket 9 and an angle encoder. The mounting bracket 9 is fixed on the outer side of the outlet section of the outer drum 1, the servo motor 8 is installed on the mounting bracket 9 and coaxially connected with the hinge shaft of the adjustable guide vane 7, and the servo motor 8 transmits power and signals with the outside through the slip ring on the outer drum 1. Of course, a wireless transmission module can also be used to realize power and signal transmission. The angle encoder is arranged at the output shaft of the servo motor 8. The adjustable guide vane 7 is adjusted in an angle range of 5°-30° relative to the radial direction of the outer drum 1. The material-approaching surface of the adjustable guide vane 7 is covered with detachable honeycomb wear-resistant plates; and a dust cover is arranged on the servo motor 8. When the adjustable guide vane 7 is adjusted in an angle range of 5°-15°, the guide vane 7 is close to the vertical radial position, forming a steep guide surface, prolonging the residence time of the material in the drum and enhancing the screening and retention of fine particles. When the adjustable guide vane 7 is adjusted in an angle range of 25°-30°, the guide vane 7 is more inclined to be parallel to the tangential direction of the outer drum 1 and deviated to the rotation direction, forming a gentle guide surface and accelerating the discharge of coarse particles. The angle adjusting mechanism is rotated together with the outer drum 1, so that the angle adjusting mechanism is stationary relative to the outer drum 1. Thus, the servo motor 8 rotates the adjustable guide vane 7 to dynamically adjust the opening and closing angle of the guide vane 7.

[0046] To realize automatic adjustment of the adjustable guide vane 7, an ultrasonic particle size sensor can be arranged at the inlet of the outer drum 1 to detect the size of the fine particles of the slag. The ultrasonic particle size sensor can also be arranged at the internal screening outlet section of the outer drum 1 to directly monitor the particle size of the discharge, so as to more accurately adjust the angle of the guide vane 7. When the proportion of fine particles less than 5mm is greater than 60%, the angle of the guide vane 7 is automatically reduced, so that the angle of the adjustable guide vane 7 is in the range of 5°-15°, and the screening and retention are enhanced. When the proportion of coarse particles greater than 20mm is greater than 40%, the angle of the guide vane 7 is automatically increased, so that the angle of the adjustable guide vane 7 is in the range of 25°-30°, and the discharge is accelerated. A controller can be arranged, which is connected with the ultrasonic particle size sensor and adjusts the output of the servo motor 8 according to the size of the fine particles of the slag detected by the ultrasonic particle size sensor and the proportion of the fine particle size.

[0047] Here, the electromagnetic iron remover includes, in sequence along the material conveying direction:

[0048] The primary permanent magnetic drum has a group of neodymium iron boron magnetic blocks arranged in a fan shape on the outer side of the drum wall, the surface magnetic field strength is 0.45 to 0.55 Tesla, and the drum body rotating speed is adjustable in the range of 10-20r / min.

[0049] The secondary electromagnetic separator comprises a liftable magnetic pole plate and a pulse power control module, the magnetic pole plate spacing is adjusted by a servo motor, and the adjustment range is 5-15 mm.

[0050] The tertiary vertical magnetic filter is provided with a distance-adjustable magnetic grid and a non-conducting baffle in a cylinder, the surface of the magnetic grid is coated with a tungsten carbide wear-resistant layer, and the magnetic grid and the non-conducting baffle are arranged in a 45° cross arrangement, and an axial magnetic field gradient of the embedded ring-shaped strong magnet in the bottom conical slag hopper is greater than or equal to 5T / m.

[0051] The electromagnetic iron remover realizes efficient metal recovery through the synergistic effect of three-stage magnetic separation and closed-loop intelligent control; the permanent magnet roller quickly sorts large pieces of metal, the electromagnetic separator accurately captures fine and weakly magnetic substances, and the vertical magnetic filter deeply filters micron-level residues; at the same time, the system automatically adjusts the magnetic field strength and the sorting parameters according to the real-time detection data, so that the metal recovery rate is increased by 10%-20%

[0052] The whole processing flow is as follows: firstly, the slag is conveyed to the feeding roller screen by the feeding conveyor belt, and is screened into coarse material and fine material, the coarse material is sent into the crusher by the hanging selection machine, and is returned to the feeding conveyor belt after crushing. Then, the coarse material is separated from the magnetic material by the electromagnetic iron separator, and is sent into the ironing machine by the iron conveying belt, and then is screened by the upward suction type magnetic separator, the magnetic material is sent into the iron cage, and the rest is sent into the first jigging machine; the fine material is sent into the iron conveying belt after the magnetic material is separated by the permanent magnet roller, and the rest is sent into the sanding machine by the sand conveying belt, and then is screened by the first wet type magnetic separator, the magnetic material is sent into the iron cage, and the rest is sent into the second jigging machine; the fine material screened by the iron cage is treated by the second wet type magnetic separator, the magnetic material is sent into the iron powder pool, and the rest is sent into the screening system, and the iron pieces selected by the iron cage are sent into the iron pool. Then, the first jigging machine and the second jigging machine of the screening system separate the upflow material and the conical hopper material, the upflow material is sent into the spiral sand washing machine, the conical hopper material is sent into the shaking table to shake out the non-ferrous metal material, and the other material is sent into the recovery system. After the spiral sand washing machine is cleaned, the suspended material is separated from the garbage and sewage material by the floating cage, and the sand material is screened into three materials by the grading roller screen and is sent into the separation system, the slag screened by the grading roller screen is sent into the dehydration screen, and the sewage material of the floating cage and the dehydration screen is sent into the recovery system. The separation system separates the aluminum material and the tailings by the eddy current separator, and the tailings are recovered and treated. The recovery system deposits the sewage material, the deposited sand material is sent into the dehydration screen, and the deposited sewage is subjected to solid-liquid separation to obtain circulating water. In addition, the material smaller than 3mm output by the grading roller screen is dehydrated into fine sand by the dehydration screen and is sent into the sand field, and the material larger than 12mm and 3-12mm is respectively extracted by the eddy current separator, and the tailings are sent back to the crusher; the third jigging machine of the screening system receives the tail sand of the shaking table, and the screened material is processed according to the flow; the devices such as the feeding roller screen and the electromagnetic iron separator operate according to their special structure and working principle, and ensure the efficient operation of the system.

[0053] The above only describes the preferred embodiments of the present application, and is not intended to limit the scope of the patent application of the present application. Any equivalent changes, equivalent replacements or modified changes within the technical spirit and principles of the present application should be included in the patent protection scope of the present application.

Claims

1. A wet comprehensive utilization system for municipal solid waste incineration power generation slag, characterized in that, include: The crushing system transports the received slag to the feeding drum screen via a feeding conveyor belt, and screens it into coarse and fine materials. The coarse materials are fed into the crusher via a hanging separator, and after crushing, they are fed back into the feeding conveyor belt for circulation. The magnetic separation system separates the coarse material from the feeding drum screen by an electromagnetic separator, then feeds it to an iron-making machine via an iron conveyor belt. The coarse material is further screened by an upward-attraction magnetic separator, and then fed into a rolling iron cage. The remaining material is fed into the first jig of the screening system. The fine material from the feeding drum screen is separated by a permanent magnet drum and fed into an iron conveyor belt. The remaining material is fed into a sand-making machine via a sand conveyor belt, then further screened by a first wet magnetic separator. The fine material is fed into a rolling iron cage, and the remaining material is fed into the second jig of the screening system. The fine material separated by the rolling iron cage is fed into a second wet magnetic separator. The magnetic material obtained from the magnetic separation is fed into an iron powder tank, and the remaining material after magnetic separation is fed into the screening system. The iron parts separated by the rolling iron cage are fed into an iron tank. The screening system separates upstream material and cone-shaped material through a first jig and a second jig. The upstream material is sent to the spiral sand washer of the dewatering system, and the cone-shaped material is sent to the corresponding first and second shaking tables to shake out non-ferrous metals. The non-ferrous metals are sent to the non-ferrous metal collection pool. Other materials shaken out by the first and second shaking tables are sent to the recycling system. The dewatering system uses a spiral sand washer to clean the suspended material, separating garbage and wastewater from the floating cage. The sand material is then fed into a grading drum screen to be divided into three grades: less than 3mm, 3-12mm, and greater than 12mm, and then sent to the sorting system. The slag screened out by the grading drum screen is sent to a dewatering screen, which separates recyclable sand and wastewater. The wastewater from the floating cage and dewatering screen is sent to the recycling system. The sorting system uses an eddy current separator to separate aluminum material and tailings. The aluminum material is sent to the aluminum pool, and the tailings are recycled. The recycling system involves sedimentation of wastewater materials, followed by the feeding of the precipitated sand material into a dewatering screen in the dewatering system. This screen separates the sedimented wastewater into solid and liquid components, resulting in recycled water.

2. The wet comprehensive utilization system for municipal solid waste incineration power plant slag according to claim 1, characterized in that: The material smaller than 3mm output from the grading drum screen is dewatered by the dewatering screen to become fine sand and is directly transported to the sand plant; the material larger than 12mm and 3-12mm are respectively extracted into aluminum by a single-layer eddy current separator and a double-layer eddy current separator, and the tailings are sent back to the crusher for further processing by a conveyor belt.

3. The wet comprehensive utilization system for municipal solid waste incineration power plant slag according to claim 1, characterized in that: The screening system also includes a third jig for receiving the tailings from the shaking table after sedimentation in the recovery system. The third jig sends the selected upstream material to the spiral sand washer of the dewatering system and sends the cone bucket material to the copper head machine of the magnetic separation system for crushing. The crushed material is then sent to the second shaking table. The second jig sends the troughed material to the copper head machine.

4. The wet comprehensive utilization system for municipal solid waste incineration power plant slag according to claim 1, characterized in that: The feeding drum screen includes a fixed frame, a coaxially arranged outer drum, and a central shaft. The outer drum has screen holes evenly distributed on its wall, with a screen hole diameter of 8-12 mm. A reverse spiral guide plate is fixedly connected to the central shaft along the axial direction, and the inclination angle of the reverse spiral guide plate is 25-30°. The reverse spiral guide plate is located at the inlet section of the outer drum. The outer drum is connected to a first drive gear, and the end of the central shaft is connected to a second drive gear. Both the first drive gear and the second drive gear are connected to the output end of a differential, and the input end of the differential is connected to a drive motor. The drive motor synchronously drives the outer roller to rotate at a first speed through the differential, and drives the central shaft to rotate at a second speed in the opposite direction, wherein the difference between the first speed and the second speed is controlled to be 1.8-2.2 revolutions per minute.

5. The wet comprehensive utilization system for municipal solid waste incineration power plant slag according to claim 4, characterized in that: The two ends of the central shaft are connected to the mounting base of the fixed frame through bearings. The outer ring of the bearing is fitted with a polyurethane buffer sleeve, which is snapped and fixed to the mounting base. An annular positioning sleeve is provided between the outer ring of the bearing and the polyurethane buffer sleeve. The outer peripheral wall of the annular positioning sleeve and the inner wall of the polyurethane buffer sleeve are vulcanized to form a coating and fixation.

6. The wet comprehensive utilization system for municipal solid waste incineration power plant slag according to claim 4, characterized in that: The material-facing surface of the reverse spiral guide plate is machined with continuous wavy guide grooves, which undulate periodically along the extension direction of the spiral guide plate.

7. The wet comprehensive utilization system for municipal solid waste incineration power generation slag according to claim 4, characterized in that: An adjustable guide plate is hinged to the outlet section of the outer roller, and the adjustable guide plate is axially arranged along the inner side of the outer roller. The opening and closing angle of the adjustable guide plate is dynamically adjusted by an angle adjustment mechanism, which includes a servo motor, a mounting bracket, and an angle encoder. The mounting bracket is fixed to the outside of the outlet section of the outer roller, and the servo motor is mounted on the mounting bracket and coaxially connected to the hinge shaft of the adjustable guide plate. The angle encoder is located at the output shaft of the servo motor. The adjustable angle range of the adjustable guide plate is 5°-30° relative to the radial direction of the outer roller.

8. The wet comprehensive utilization system for municipal solid waste incineration power generation slag according to claim 7, characterized in that: The adjustable guide vane has a removable honeycomb wear-resistant plate covering its material-facing surface; the servo motor is equipped with a dust cover.

9. The wet comprehensive utilization system for municipal solid waste incineration power plant slag according to claim 1, characterized in that: The electromagnetic separator comprises components arranged sequentially along the material conveying direction: The primary permanent magnet drum has a fan-shaped arrangement of neodymium iron boron magnet blocks on the outer side of the drum wall, with a surface magnetic field strength of 0.45 to 0.55 Tesla, and the drum rotation speed is adjustable from 10 to 20 r / min. A two-stage electromagnetic sorting machine includes liftable magnetic pole plates and a pulse power control module. The spacing between the magnetic pole plates is adjusted by a servo motor, with an adjustment range of 5-15mm. The three-stage vertical magnetic filter has an adjustable spacing magnetic grid and non-flow-guiding baffle inside its cylinder. The surface of the magnetic grid is coated with a tungsten carbide wear-resistant layer and is arranged at a 45° angle to the non-flow-guiding baffle. The bottom conical slag hopper is embedded with an annular strong magnet with an axial magnetic field gradient of not less than 5T / m.

10. The wet comprehensive utilization system for municipal solid waste incineration power generation slag according to claim 9, characterized in that: The spacing of the magnetic grid of the three-stage vertical magnetic filter is adjusted by linkage with an electric push rod. The stroke of the electric push rod is linearly positively correlated with the current intensity of the two-stage electromagnetic separator. The control signal of the electric push rod and the real-time feedback data of the metal detector form a closed-loop control circuit through a PLC controller. The metal detector is installed at the outlet end of the three-stage vertical magnetic filter.

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