A harmless treatment device for treating aluminum-chromium residue by complexation

Abstract

The utility model belongs to the harmless treatment of aluminium chromium slag technology field of complexation method belongs to the harmless treatment device of aluminium chromium slag of complexation method is disclosed, and the first jacking mechanism is fixedly arranged in the front bottom in the frame, and the second jacking mechanism is fixedly arranged in the rear middle position in the frame, the complexation reaction cylinder is fixedly installed in the upper portion of rotating mechanism, the rotating mechanism is fixedly arranged in the bottom position of the first jacking mechanism, the collaborative stirring mechanism is fixedly arranged in the upper portion of the second jacking mechanism, the reducing agent cylinder is fixedly installed in the upper center of support plate no.

Description

Technical Field

[0001] This utility model belongs to the technical field of harmless treatment of aluminum-chromium slag by complexation method, and specifically relates to a harmless treatment device for aluminum-chromium slag by complexation method. Background Technology

[0002] Aluminum-chromium slag is an industrial solid waste generated during the smelting of metallic chromium. It is highly toxic; when left in the open, rain and snow can leach hexavalent chromium into groundwater, rivers, and lakes, polluting the environment. According to authoritative publicly available information, hexavalent chromium is highly carcinogenic and can enter the human body through the digestive tract, respiratory tract, skin, and mucous membranes, accumulating in the liver, kidneys, and endocrine glands, leading to cancer. Therefore, before recycling, hazardous solid waste aluminum-chromium slag needs to be treated to convert the hexavalent chromium into a structurally stable trivalent chromium state, forming harmless solid waste aluminum-chromium slag. The main chemical components of aluminum-chromium slag are: Al₂O₃ (70.70%), Cr₂O₃ (11.20%), MgO (3.45%), SiO₂ (5.07%), and CaO (1.21%). Due to its main phase being chromium corundum and low cost, aluminum-chromium slag is a high-performance refractory material with great application potential. Currently, the harmless treatment of aluminum-chromium slag mainly includes liquid-phase reduction, gas-phase reduction, solid-phase reduction, complexation, microwave, and electrochemical methods. The main technical problems with liquid-phase reduction, gas-phase reduction, solid-phase reduction, microwave, and electrochemical methods for harmlessly treating aluminum-chromium slag are: incomplete removal of hexavalent chromium, resulting in incomplete reduction of residual hexavalent chromium; and the more stable complex structure formed by the complexation method, which effectively inhibits the secondary oxidation of Cr³⁺.

[0003] In existing technologies, the complexation method for the harmless treatment of aluminum-chromium slag involves a chemical complexation reaction to remove hexavalent chromium (Cr). 6 A method for treating aluminum-chromium slag by converting chromium (⁺) into trivalent chromium (Cr³⁺) and forming a stable complex. The specific method for harmlessly treating aluminum-chromium slag using the complexation method is as follows: First, the waste aluminum-chromium slag is crushed to below 80 mesh to increase the reaction contact area. Then, the pH of the waste aluminum-chromium slag powder is adjusted to 2-3 with sulfuric acid solution to create an acidic environment for subsequent reduction. Then, ferrous sulfate reducing agent is added at 5%-8% of the mass of the waste aluminum-chromium slag powder, and the mixture is stirred and reacted for 30 minutes to convert Cr³⁺ into trivalent chromium. 6The chromium oxide (⁺) is reduced to Cr³⁺; then, 5%~10% of a complexing agent (lignin sulfonate) is added by weight of the aluminum-chromium slag, reacting to form an aluminum-chromium lignin sulfonate complex, at which point stable trivalent chromium is formed; finally, the aluminum-chromium lignin sulfonate complex is precipitated, filtered, and dehydrated, and the precipitate is dried and recycled as a refractory raw material. Currently, the main technical problem with equipment for the harmless treatment of aluminum-chromium slag using the complexation method is that the reduction and complexation reaction, precipitation, and filtration dehydration of waste aluminum-chromium slag are all operated independently, without forming a continuous processing flow. This results in low efficiency in the harmless treatment of waste aluminum-chromium slag and cannot meet the demand for large-scale recycling of refractory raw materials. Based on the above-mentioned deficiencies in the existing technology, the inventors have developed a harmless treatment device for aluminum-chromium slag using the complexation method, which can effectively solve the above-mentioned problems in the existing technology. Utility Model Content

[0004] To address the aforementioned technical problems, this invention provides a harmless treatment device for aluminum-chromium slag using a complexation method. This invention features a scientifically designed and simple structure, significantly improving the efficiency of harmless treatment of waste aluminum-chromium slag. Furthermore, this invention solves the problem in existing technologies where the equipment for harmless treatment of aluminum-chromium slag lacks a continuous processing flow, resulting in low efficiency and an inability to meet the demand for large-scale secondary recycling of refractory raw materials.

[0005] The technical solution adopted by this utility model is as follows: a harmless treatment device for complexation treatment of aluminum-chromium slag, including a mounting plate, a frame, a first support plate, and a second support plate. The mounting plate is fixedly installed at the bottom of the frame, which is an inclined and hollow H-shaped structure. The first support plate is fixedly installed at the middle left side of the frame, and the second support plate is fixedly installed at the middle right side of the frame. The first lifting mechanism is fixedly installed at the bottom front side of the frame, and the second lifting mechanism is fixedly installed at the middle rear side of the frame. The complexation reaction cylinder is fixedly installed on the upper part of the rotating mechanism. The complexation reaction cylinder is a hollow cylindrical shape with a closed lower part and an open upper part. The rotating mechanism is fixedly installed at the bottom of the first lifting mechanism and extends through the first lifting mechanism to the upper part. The co-stirring mechanism is fixedly installed on the upper part of the lifting mechanism two, and extends into the interior of the complexing reaction cylinder; the reducing agent cylinder is fixedly installed on the upper center of the support plate one, and the complexing agent cylinder is fixedly installed on the upper center of the support plate two; centrifugal pump one is installed at the upper center of the reducing agent cylinder, and centrifugal pump two is installed at the upper center of the complexing agent cylinder; the atomizing nozzle is fixedly installed at the middle of the front side of the lifting mechanism two; the reversing solenoid valve is fixedly installed on the upper part of the atomizing nozzle, and the reversing solenoid valve is fixedly connected to the outlet of centrifugal pump one and centrifugal pump two respectively through hoses; there are two tube coils, one fixedly installed on the upper left side of the lifting mechanism two, and the other fixedly installed on the upper right side of the lifting mechanism two.

[0006] The lifting mechanism includes a lifting cylinder, which is inclinedly set at the bottom center of the front side of the frame. The bottom of the lifting cylinder is fixed to the bottom center of the front side of the frame, and the upper part of the lifting cylinder is fixed to the front side of the lifting plate near the center. The lifting plate is a square plate with an arc shape at the rear end. Side ears are fixedly set on the left and right sides of the front side of the lifting plate, and the hinge shaft passes through the side ears on the left and right sides of the lifting plate and is fixedly hinged to the left and right sides of the upper front side of the frame.

[0007] The second lifting mechanism includes a fixed plate, which is laterally inclined and positioned at the middle of the rear side of the frame. The bottom of the hydraulic cylinder is fixed to the upper center of the fixed plate, and the upper part of the hydraulic cylinder is fixed to the bottom of the rear side of the cover plate. The cover plate is a square plate with an arc shape at the front end, and the partition is a U-shaped plate with an arc corner at the upper rear side. The partition is fixedly positioned at the middle of the upper part of the cover plate, and the transmission port is located at the middle of the bottom front side of the partition plate. The transmission port is square in shape. The convex plate is fixedly positioned at the middle of the bottom rear side of the cover plate, and the rear end face of the convex plate is aligned with the upper rear end face of the frame. There are two pins, one of which passes through the left side of the upper rear side of the frame and is hinged to the left side of the convex plate, and the other passes through the right side of the upper rear side of the frame and is hinged to the right side of the convex plate.

[0008] The cover plate includes a cover plate body, and a protruding ring is fixedly provided on the bottom front side of the cover plate body. The outer diameter of the protruding ring is smaller than the diameter of the complexing reaction cylinder. The protruding ring is concentric with the complexing reaction cylinder, and a gap is left between the cover plate body and the upper end face of the complexing reaction cylinder.

[0009] The rotating mechanism is fixedly installed at the bottom of the lifting plate. The rotating mechanism includes a drive motor and a reducer as an integral structure. The drive motor and reducer are fixed at the bottom center of the lifting plate. The drive shaft is the output shaft of the reducer. The upper end of the drive shaft is installed in the inner ring of the slewing bearing. The outer ring of the slewing bearing is fixedly installed in the center mounting hole of the lifting plate. The drive shaft extends through the lifting plate to the upper part. The support plate is fixedly installed on the upper part of the drive shaft. The complexing reaction cylinder is fixed on the support plate.

[0010] The synergistic stirring mechanism includes a motor, which is fixedly mounted on the rear side of the partition plate via a mounting plate. A pulley is fixed to the bottom of the motor's power output shaft. A driven pulley is fixed to the upper part of a shaft seat, which is fixed to the upper part of the cover plate near the front center. A stirring shaft is fixedly mounted at the bottom of the shaft seat and is fixedly mounted in the inner ring of the bearing of the shaft seat. The stirring shaft extends into the interior of the complexing reaction cylinder near the bottom, and the stirring shaft and the complexing reaction cylinder are concentric. A transmission belt is mounted on the pulley and the driven pulley, and the pulley and the driven pulley are driven by the transmission belt. Two stirring blades are arranged symmetrically in a group. One to three groups of stirring blades are staggered from top to bottom on the lower section of the stirring shaft. A scraper is located near the inner wall of the complexing reaction cylinder. The scraper includes a fixed seat, which is fixedly mounted on the upper part of the cover plate, located on the front side of the partition plate near the right side. The upper end of the mounting shaft is fixedly mounted in the inner ring of the bearing of the fixed seat, and the lower part of the mounting shaft extends into the interior of the complexing reaction cylinder near the bottom. Long strip-shaped scrapers are symmetrically arranged on the mounting shaft.

[0011] The atomizing nozzle is fixedly mounted on the upper front side of the cover plate at the middle position via a mounting plate, and the nozzle of the atomizing nozzle extends into the interior of the complexing reaction cylinder.

[0012] The reversing solenoid valve includes a reversing solenoid valve body. The bottom of the reversing solenoid valve body is fixedly connected to the upper part of the atomizing nozzle. Input pipe one is fixedly located on the left side of the reversing solenoid valve body, and input pipe two is fixedly located on the right side of the reversing solenoid valve body. Input pipe one and input pipe two are connected to the interior of the reversing solenoid valve body. A valve core that can be electromagnetically reversed is provided in the reversing solenoid valve body.

[0013] The tube coil includes a fixed plate, which is fixedly installed on the upper left or right side of the partition plate. A rotating shaft is fixedly installed on the outer end of the fixed plate. Bearings are symmetrically arranged on both sides of the center of the winding wheel. The rotating shaft extends through the symmetrically arranged bearings to the left side of the winding wheel. The rotating shaft is fixed to the inner ring of the bearing. An end cap is fixedly installed on the left end of the rotating shaft. The end cap is fixedly installed on the left end face of the winding wheel.

[0014] The lifting cylinder is fixedly connected to the output end of the hydraulic station via a high-pressure oil pipe; the reversing solenoid valve is fixedly connected to the PLC control module via a signal line.

[0015] The working process of this harmless treatment device for aluminum-chromium slag via complexation: I. Feeding Process of Waste Aluminum-Chromium Slag: First, the operator starts the lifting mechanism's cylinder via the control switch. The cylinder's extension rod begins to extend. Under the lifting action of the extension rod, the cover plate, with the pin as its rotation axis, lifts the cover plate, partition plate, and co-mixing mechanism to a 90° angle (at this time, the mixing shaft and mixing blades of the co-mixing mechanism are perpendicular to the upper end face of the complexing reaction cylinder). Then, the operator starts the belt conveyor via the control switch. The belt conveyor will then transport the waste aluminum-chromium slag... The pulverized waste aluminum-chromium slag is conveyed into the complexing reaction cylinder. When the waste aluminum-chromium slag in the complexing reaction cylinder is filled to four-fifths of the material level, the operator turns off the belt conveyor through the control switch of the belt conveyor. Then, the operator turns off the hydraulic cylinder through the control switch of the hydraulic cylinder. At this time, the extension rod of the hydraulic cylinder begins to retract, placing the cover plate of the lifting mechanism and the stirring shaft and stirring blade of the co-stirring mechanism into the complexing reaction cylinder. At this time, the convex ring at the bottom front side of the cover plate is exactly concentric with the complexing reaction cylinder, and a gap is left between the cover plate and the upper end face of the complexing reaction cylinder.

[0016] II. Harmless Treatment of Waste Aluminum-Chromium Slag in the Complexation Reactor: First, the operator turns on centrifugal pump one via its control switch. Centrifugal pump one extracts the ferrous sulfate aqueous solution from the reducing agent cylinder and delivers it through the outlet of centrifugal pump one and a hose to the inside of the reversing solenoid valve (at this time, the valve core of the reversing solenoid valve to input pipe two is closed). Then, the ferrous sulfate aqueous solution inside the reversing solenoid valve is further delivered to the atomizing nozzle, which atomizes and sprays it onto the waste aluminum-chromium slag. Simultaneously, the operator starts the motor of the co-stirring mechanism via its control switch. The motor starts rotating, driving the pulley to rotate. The pulley, through a transmission belt, drives the driven pulley to rotate. The driven pulley's rotation causes the stirring shaft and impeller to rotate clockwise. Simultaneously, the operator activates the drive motor of the rotating mechanism via a control switch. The drive motor, through a reducer, increases the rotational torque, transmitting the rotational power to the support plate via the drive shaft. The high torque of the support plate drives the complexing reaction cylinder to rotate counter-clockwise. As the complexing reaction cylinder rotates counter-clockwise, when the scraper blades of the scraper are tangential to the inner wall of the complexing reaction cylinder, they can break up the complexing... The material adhering to the inner wall of the reaction cylinder is scraped off. Under the combined action of the clockwise rotation of the stirring shaft and impeller and the counterclockwise rotation of the complexing reaction cylinder, the waste aluminum-chromium slag can be sprayed with ferrous sulfate solution while being stirred, reducing hexavalent chromium in the waste aluminum-chromium slag to trivalent chromium. After spraying the ferrous sulfate solution and stirring for half an hour, the PLC control module sends a control command to the reversing solenoid valve to switch the direction, and simultaneously sends a stop control command to centrifugal pump one. After the reversing solenoid valve switches the direction (the valve core of the reversing solenoid valve to input pipe one is closed), at the same time, the PLC control module sends a control command to centrifugal pump two... Upon receiving the start control command, centrifugal pump two extracts an aqueous solution of papermaking waste liquor, primarily composed of lignin sulfonate, from the complexing agent cylinder through its outlet and hose. This solution is then sprayed onto the waste aluminum-chromium slag via an atomizing nozzle. Simultaneously, the complexing reaction cylinder rotates counterclockwise, the stirring shaft and impeller rotate clockwise, and the scraper provides coordinated stirring. This process, lasting two hours, allows the waste aluminum-chromium slag (aluminum phase) to undergo a complexing reaction, forming a stable complex and preventing secondary oxidation of the waste aluminum-chromium slag. After two hours of stirring and complexing reaction, the PLC control module sends a stop control command to centrifugal pump two.

[0017] III. Unloading, sedimentation, and filter pressing of aluminum-chromium slag after harmless treatment: After the waste aluminum-chromium slag has been harmlessly treated, the operator opens the lifting cylinder through the control switch of the lifting mechanism. The extension rod of the lifting cylinder begins to extend. Under the lifting action of the extension rod, the lifting plate rotates slowly forward around the hinge shaft, driving the rotating mechanism and the complexing reaction cylinder. At the same time, the lifting mechanism repeats the lifting action during the unloading process of the waste aluminum-chromium slag, lifting the cover plate, partition plate, and co-stirring mechanism to 90°. At this time, the stirring shaft and stirring blades leave the complexing reaction cylinder. When the lifting plate drives the rotating mechanism and the complexing reaction cylinder to continue to rotate forward, the harmlessly treated aluminum-chromium slag in the complexing reaction cylinder is poured into the sedimentation chamber. After sedimentation, the aluminum-chromium slag slurry is transported to the filter press by the slurry pump to obtain non-toxic aluminum-chromium slag.

[0018] The beneficial effects of this utility model are as follows: By setting up a lifting mechanism 1, a lifting mechanism 2, a complexing reaction cylinder, a rotating mechanism, a co-stirring mechanism, a reducing agent cylinder, a complexing agent cylinder, a centrifugal pump 1, a centrifugal pump 2, an atomizing nozzle, and a reversing solenoid valve, a device for continuous and harmless treatment of waste aluminum-chromium slag is formed. This realizes the sequential occurrence of reduction and complexation reactions of waste aluminum-chromium slag in the complexing reaction cylinder, thereby reacting hexavalent chromium in the waste aluminum-chromium slag to generate trivalent chromium, enhancing the stability of trivalent chromium in the aluminum-chromium slag, and meeting the demand for a large amount of refractory raw materials for secondary recycling. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of the present invention viewed from the front. Figure 2 This is a structural schematic diagram of the present invention from the rear view direction; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a partial enlarged view of the lifting mechanism and the rotating mechanism of this utility model; Figure 5 This is a cross-sectional view of the tube coil of this utility model; Markings in the diagram: 1. Mounting plate, 2. Frame, 3. Support plate one, 4. Support plate two, 5. Lifting mechanism one, 51. Lifting cylinder, 52. Lifting plate, 53. Side lug, 54. Hinge shaft, 6. Lifting mechanism two, 61. Fixing plate, 62. Cylinder, 63. Cover plate, 631. Cover plate body, 632. Convex ring, 64. Partition plate, 65. Transmission port, 66. Convex plate, 67. Pin shaft, 7. Complexing reaction cylinder, 8. Rotating mechanism, 81. Drive motor, 82. Reducer, 83. Drive shaft, 84. Support plate, 9. Co-mixing mechanism, 91. Electric... 92. Pulley, 93. Driven Pulley, 94. Shaft Seat, 95. Stirring Shaft, 96. Stirring Blade, 97. Scraper, 971. Fixed Seat, 972. Mounting Shaft, 973. Scraper, 10. Reducing Agent Cylinder, 11. Complexing Agent Cylinder, 12. Centrifugal Pump One, 13. Centrifugal Pump Two, 14. Atomizing Nozzle, 15. Reversing Solenoid Valve, 151. Reversing Solenoid Valve Body, 152. Input Pipe One, 153. Input Pipe Two, 16. Pipe Coil, 161. Fixed Plate, 162. Rotating Shaft, 163. Bearing, 164. End Cap, 165. Winding Wheel. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0021] This utility model provides a harmless treatment device for treating aluminum-chromium slag using a complexation method: like Figure 1 or Figure 3 As shown, the belt conveyor in this invention is positioned on the left front side of the complexing reaction cylinder 7, and its height is flush with that of the complexing reaction cylinder 7. The other end of the belt conveyor is located below the feed inlet of the grinding mill.

[0022] like Figure 1 or Figure 3 As shown, the sedimentation chamber of this invention is fixedly installed at the lower front part of the complexing reaction cylinder 7 (i.e., the front part of the frame 2). A slurry pump is installed at the bottom of the sedimentation chamber, which can pump the harmlessly treated aluminum-chromium slag slurry in the sedimentation chamber to the filter press for filter pressing.

[0023] like Figure 1 , 2 As shown in Figure 3, mounting plate 1 is fixedly installed at the bottom of frame 2, which is an inclined and hollow H-shaped structure. The mounting plate 1 securely fixes frame 2 to the workshop floor. Frame 2 provides a stable installation space for support plate 1 (3), support plate 2 (4), lifting mechanism 1 (5), lifting mechanism 2 (6), complexing reaction cylinder (7), rotating mechanism (8), and co-mixing mechanism (9).

[0024] like Figure 1and 2 As shown, support plate 3 is fixedly installed at the middle left side of frame 2, and support plate 4 is fixedly installed at the middle right side of frame 2; reducing agent cylinder 10 is fixedly installed at the upper center of support plate 3, and complexing agent cylinder 11 is fixedly installed at the upper center of support plate 4. The main purpose of this arrangement is to provide stable and fixed support for reducing agent cylinder 10 and complexing agent cylinder 11 through the support plates 3 and 4.

[0025] like Figure 1 As shown, the complexing reaction cylinder 7 is fixedly installed on the upper part of the rotating mechanism 8. The complexing reaction cylinder 7 is a hollow cylinder with a closed lower part and an open upper part; the complexing reaction cylinder 7 is fixed on the support plate 84 of the rotating mechanism 8. The main purpose of this arrangement is that the cooperation between the drive motor 81 and the reducer 82 generates a large torque rotational power, which can drive the complexing reaction cylinder 7 containing aluminum chromium slag waste to rotate counterclockwise.

[0026] like Figure 1 , 2 As shown in Figure 3, the lifting mechanism 1 5 is fixedly installed at the bottom front side inside the frame 2, and the lifting mechanism 2 6 is fixedly installed at the middle rear side inside the frame 2.

[0027] The aforementioned lifting mechanism 5 and lifting mechanism 6 allow for the following process: during material feeding, the lifting cylinder 51 of lifting mechanism 26 can lift the cover plate 63 and the co-stirring mechanism 9 to a 90° angle, enabling the waste aluminum-chromium slag to be transported to the complexing reaction cylinder 7 via a belt conveyor. After the waste aluminum-chromium slag has been properly treated, and the aluminum-chromium slag in the complexing reaction cylinder 7 needs to be emptied, lifting mechanism 5 lifts and rotates the complexing reaction cylinder 7 forward. Simultaneously, the synchronous lifting action of lifting mechanism 26 causes the cover plate 63 and the co-stirring mechanism 9 to move away from the complexing reaction cylinder 7, thus allowing the aluminum-chromium slag slurry to be poured into the sedimentation chamber. After sedimentation, the slurry is pumped to a filter press to recover the aluminum-chromium slag.

[0028] like Figure 3 As shown, the complexing reaction cylinder 7 is fixedly installed on the upper part of the rotating mechanism 8. The complexing reaction cylinder 7 is a hollow cylindrical shape with a closed lower part and an open upper part. The complexing reaction cylinder 7 is fixed on the support plate 84 of the rotating mechanism 8.

[0029] The complexing reaction cylinder 7 is fixed on the support plate 84 of the rotating mechanism 8. The large torque rotation of the rotating mechanism 8 enables the complexing reaction cylinder 7 to rotate counterclockwise. When the aluminum-chromium slag in the complexing reaction cylinder 7 is atomized and sprayed with reducing agent (ferrous sulfate aqueous solution) or when the slag is atomized and sprayed with reducing agent complexing agent (papermaking waste liquid), the counterclockwise rotation of the complexing reaction cylinder 7, the clockwise rotation of the stirring shaft 95 and the stirring blade 96, and the synergistic stirring action of the scraper 97 improve the completeness of the reduction and complexation reaction of the aluminum-chromium slag in the complexing reaction cylinder 7, completely converting the hexavalent chromium in the aluminum-chromium slag into trivalent chromium, and increasing the stability of the trivalent chromium in the aluminum-chromium slag. On the other hand, it achieves thorough and uniform stirring of the aluminum-chromium slag in the complexing reaction cylinder 7.

[0030] like Figure 3 As shown in Figure 4, the rotating mechanism 8 is fixedly installed at the bottom of the lifting plate 52. The rotating mechanism 8 includes a drive motor 81, and the drive motor 81 and the reducer 82 are an integral structure. The drive motor 81 and the reducer 82 are fixed at the bottom center of the lifting plate 52. The drive shaft 83 is the output shaft of the reducer 82. The upper end of the drive shaft 83 is installed in the inner ring of the slewing bearing. The outer ring of the slewing bearing is fixedly installed in the center mounting hole of the lifting plate 52. The drive shaft 83 extends through the lifting plate 52 to the upper part. The support plate 84 is fixedly installed on the upper part of the drive shaft 83. The complexing reaction cylinder 7 is fixed on the support plate 84.

[0031] The aforementioned configuration of drive motor 81, reducer 82 and drive shaft 83 can generate high torque rotational power, thereby achieving counterclockwise rotation of the aluminum-chromium slag in complexing reaction cylinder 7.

[0032] like Figure 1 , 2As shown in Figure 3, the co-stirring mechanism 9 includes a motor 91, which is fixedly mounted on the rear side of the partition 64 via a mounting plate. A pulley 92 is fixed to the bottom of the power output shaft of the motor 91. A driven pulley 93 is fixed to the upper part of a shaft seat 94, which is fixed to the upper part of the cover plate 63 near the front center. A stirring shaft 95 is fixedly mounted at the bottom of the shaft seat 94, and is fixedly mounted in the inner ring of the bearing of the shaft seat 94. The stirring shaft 95 extends into the interior of the complexing reaction cylinder 7 near the bottom, and is concentric with the complexing reaction cylinder 7. A transmission belt is mounted on the pulley 92 and the driven pulley 93. 2 and driven pulley 93 are driven by a transmission belt; two stirring blades 96 are arranged symmetrically in a group, and one to three groups of stirring blades 96 are staggered from top to bottom on the lower section of stirring shaft 95; scraper 97 is located near the inner wall of complexing reaction cylinder 7; scraper 97 includes a fixed seat 971, which is fixedly installed on the upper part of cover plate 63, located on the front side of partition plate 64 near the right side; the upper end of mounting shaft 972 is fixedly installed in the bearing inner ring of fixed seat 971, and the lower part of mounting shaft 972 extends into the interior of complexing reaction cylinder 7 near the bottom; long strip scrapers 973 are symmetrically arranged on mounting shaft 972.

[0033] The aforementioned arrangement of motor 91, pulley 92, driven pulley 93, shaft seat 94, stirring shaft 95, stirring blade 96, and scraper 97 enables the motor 91 to rotate, which in turn drives pulley 92 to rotate. Pulley 92, via a transmission belt, drives driven pulley 93 to rotate, which in turn causes stirring shaft 95 and stirring blade 96 to rotate clockwise. Simultaneously, the drive motor 81, through the reducer 82, increases the rotational torque, transmitting the rotational power through the drive shaft. 83 transmits to the support plate 84, and under the large torque rotation of the support plate 84, it drives the complexing reaction cylinder 7 to rotate counterclockwise. At the same time as the complexing reaction cylinder 7 rotates counterclockwise, when the scraper 973 of the scraper 97 is tangent to the inner wall of the complexing reaction cylinder 7, the material adhering to the inner wall of the complexing reaction cylinder 7 can be scraped off. Under the combined action of the clockwise rotation of the stirring shaft 95 and the stirring blade 96 and the counterclockwise rotation of the complexing reaction cylinder 7, the waste aluminum chromium slag can be fully and evenly stirred.

[0034] like Figure 1 As shown in Figure 3, the reversing solenoid valve 15 includes a reversing solenoid valve body 151. The bottom of the reversing solenoid valve body 151 is fixedly connected to the upper part of the atomizing nozzle 14. Input pipe 152 is fixedly installed on the left side of the reversing solenoid valve body 151, and input pipe 2 153 is fixedly installed on the right side of the reversing solenoid valve body 151. Input pipe 152 and input pipe 2 153 are connected to the interior of the reversing solenoid valve body 151. A valve core that can be electromagnetically reversed is provided in the reversing solenoid valve body 151.

[0035] The above-mentioned setting of the reversing solenoid valve 15, with the automatic control of the PLC control module, can realize the automatic switching of the spraying of reducing agent and complexing agent.

[0036] like Figure 1 , 2 As shown in Figure 4, the tube coil 16 includes a fixed plate 161, which is fixedly disposed on the upper left or right side of the partition plate 64. A rotating shaft 162 is fixedly disposed on the outer end of the fixed plate 161. Bearings 163 are symmetrically disposed on both sides of the center of the winding wheel 165. The rotating shaft 162 extends through the symmetrically disposed bearings 163 to the left side of the winding wheel 165. The rotating shaft 162 is fixed to the inner ring of the bearings 163. An end cap 164 is fixedly disposed on the left end of the rotating shaft 162. The end cap 164 is fixedly disposed on the left end face of the winding wheel 165.

[0037] The aforementioned arrangement of the tube coil 16 allows the connecting hose between the centrifugal pump 12 or centrifugal pump 213 and the input pipe 152 or input pipe 2153 of the reversing solenoid valve 15 to be wound on the winding wheel 165 of the tube coil 16, leaving a hose allowance. When the lifting mechanism 26 lifts the cover plate 63 and the cooperating stirring mechanism 9, the hose will not be entangled or interfered with.

[0038] like Figure 1-5 The diagram illustrates the working process of this complexation method for treating aluminum-chromium slag, specifically its harmless treatment process. I. Waste Aluminum-Chromium Slag Feeding Process: First, the operator starts the lifting mechanism 6 using the control switch of the hydraulic cylinder 62. The extension rod of the hydraulic cylinder 62 begins to extend. Under the lifting action of the extension rod of the hydraulic cylinder 62, the cover plate 63, with the pin shaft 67 as the rotation axis, lifts the cover plate 63, the partition plate 64, and the co-stirring mechanism 9 to a 90° angle (at this time, the stirring shaft 95 and stirring blade 96 of the co-stirring mechanism 9 leave the complexing reaction cylinder 7 and are perpendicular to the upper end face of the complexing reaction cylinder 7). At this time, the operator starts the belt conveyor using the control switch of the belt conveyor. The belt conveyor will carry the waste aluminum-chromium slag through the belt conveyor. The pulverized waste aluminum-chromium slag is conveyed into the complexing reaction cylinder 7. When the waste aluminum-chromium slag in the complexing reaction cylinder 7 is filled to four-fifths of the material level, the operator turns off the belt conveyor through the control switch of the belt conveyor. Then, the operator turns off the hydraulic cylinder 62 again through the control switch of the hydraulic cylinder 62. At this time, the telescopic rod of the hydraulic cylinder 62 begins to retract, placing the cover plate 63 of the lifting mechanism 6 and the stirring shaft 95 and stirring blade 96 of the co-stirring mechanism 9 into the complexing reaction cylinder 7. At this time, the convex ring 632 at the bottom front side of the cover plate 63 is exactly concentric with the complexing reaction cylinder 7, and there is a gap between the cover plate 63 and the upper end face of the complexing reaction cylinder 7.

[0039] II. Harmless Treatment of Waste Aluminum-Chromium Slag in the Complexation Reactor: First, the operator turns on centrifugal pump 12 via its control switch. Centrifugal pump 12 draws out the ferrous sulfate aqueous solution from reducing agent cylinder 10 and delivers it through the outlet of centrifugal pump 12 and a hose to the inside of reversing solenoid valve 15 (at this time, the valve core of reversing solenoid valve 15 to input pipe 153 is closed). Then, the ferrous sulfate aqueous solution inside reversing solenoid valve 15 is further delivered to atomizing nozzle 14, which atomizes and sprays it onto the waste aluminum-chromium slag. At the same time, the operator turns on motor 91 of co-stirring mechanism 9 via its control switch. When the motor 91 starts rotating, it drives the pulley 92 to rotate. The pulley 92 drives the driven pulley 93 to rotate via the transmission belt. The rotation of the driven pulley 93 causes the stirring shaft 95 and the stirring blade 96 to rotate clockwise. At the same time, the operator starts the drive motor 81 of the rotating mechanism 8 through the control switch. The drive motor 81 increases the rotational torque through the reducer 82 and transmits the rotational power to the support plate 84 through the drive shaft 83. Under the high torque of the support plate 84, the complexing reaction cylinder 7 rotates counterclockwise. While the complexing reaction cylinder 7 rotates counterclockwise, the scraper 973 of the scraper 97 interacts with the complexing reaction cylinder. When the inner wall of cylinder 7 is tangent, the material adhering to the inner wall of the complexing reaction cylinder 7 can be scraped off. Under the combined action of the clockwise rotation of the stirring shaft 95 and the stirring blade 96, and the counterclockwise rotation of the complexing reaction cylinder 7, the waste aluminum-chromium slag can be sprayed with ferrous sulfate solution while being stirred, reducing hexavalent chromium in the waste aluminum-chromium slag to trivalent chromium. After spraying the ferrous sulfate solution and stirring for half an hour, the PLC control module sends a control command to the reversing solenoid valve 15 to switch the direction, and simultaneously sends a stop control command to the centrifugal pump 12. After the reversing solenoid valve 15 switches the direction (the valve core of the reversing solenoid valve 15 to the input pipe 152 is in the closed state), the PLC control module... The PLC control module sends a start control command to centrifugal pump 2 13. Centrifugal pump 2 13 extracts the papermaking waste liquid with lignin sulfonate as the main component from the complexing agent cylinder 11 through the outlet end and hose of centrifugal pump 2 13, and sprays it onto the waste aluminum chromium slag through the atomizing nozzle 14. At the same time, the complexing reaction cylinder 7 rotates counterclockwise, the stirring shaft 95 and stirring blade 96 rotate clockwise, and the scraper 97 provides synergistic stirring action to carry out the complexing reaction for two hours, which can carry out the complexing reaction of waste aluminum chromium slag (aluminum phase) to form a stable complex and prevent secondary oxidation of waste aluminum chromium slag. After the complexing reaction has been stirred for two hours, the PLC control module sends a stop control command to centrifugal pump 2 13.

[0040] III. Unloading, sedimentation, and filter pressing of aluminum-chromium slag after harmless treatment: After the waste aluminum-chromium slag has been harmlessly treated, the operator opens the lifting cylinder 51 through the control switch of the lifting mechanism 5. The telescopic rod of the lifting cylinder 51 begins to extend. Under the lifting action of the telescopic rod of the lifting cylinder 51, the lifting plate 52 rotates slowly forward around the hinge shaft 54, driving the rotating mechanism 8 and the complexing reaction cylinder 7. At the same time, the lifting mechanism 6 repeats the lifting action during the unloading process of the waste aluminum-chromium slag, lifting the cover plate 63, the partition plate 64, and the co-stirring mechanism 9 to 90°. At this time, the stirring shaft 95 and the stirring blade 96 leave the complexing reaction cylinder 7. When the lifting plate 52 drives the rotating mechanism 8 and the complexing reaction cylinder 7 to continue to rotate forward, the harmlessly treated aluminum-chromium slag in the complexing reaction cylinder 7 is poured into the sedimentation chamber. After sedimentation, the aluminum-chromium slag slurry is transported to the filter press by the slurry pump to obtain non-toxic aluminum-chromium slag.

[0041] Various modifications to the above embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A harmless treatment device for treating aluminum-chromium slag by complexation, comprising a mounting plate, a frame, a first support plate, and a second support plate; the mounting plate is fixedly installed at the bottom of the frame, and the frame has an inclined and hollow H-shaped structure; the first support plate is fixedly installed at the middle left side of the frame, and the second support plate is fixedly installed at the middle right side of the frame; characterized in that: Lifting mechanism one is fixedly installed at the bottom front side inside the frame, and lifting mechanism two is fixedly installed at the middle rear side inside the frame; the complexing reaction cylinder is fixedly installed on the upper part of the rotating mechanism, and the complexing reaction cylinder is a hollow cylindrical shape with a closed lower part and an open upper part; the rotating mechanism is fixedly installed at the bottom of lifting mechanism one and extends through lifting mechanism one to the upper part; the co-stirring mechanism is fixedly installed on the upper part of lifting mechanism two and extends into the interior of the complexing reaction cylinder; the reducing agent cylinder is fixedly installed at the upper center of support plate one, and the complexing agent cylinder is fixedly installed at the upper center of support plate two; centrifugal pump one is installed at the upper center of the reducing agent cylinder, and centrifugal pump two is installed at the upper center of the complexing agent cylinder; the atomizing nozzle is fixedly installed at the middle front side of lifting mechanism two; the reversing solenoid valve is fixedly installed on the upper part of the atomizing nozzle, and the reversing solenoid valve is fixedly connected to the water outlet of centrifugal pump one and centrifugal pump two respectively through a hose; there are two tube coils, one fixedly installed on the upper left side of lifting mechanism two, and the other fixedly installed on the upper right side of lifting mechanism two.

2. The harmless treatment device for complexation treatment of aluminum-chromium slag according to claim 1, characterized in that: The lifting mechanism includes a lifting cylinder, which is inclinedly set at the bottom center of the front side of the frame. The bottom of the lifting cylinder is fixed to the bottom center of the front side of the frame, and the upper part of the lifting cylinder is fixed to the front side of the lifting plate near the center. The lifting plate is a square plate with an arc shape at the rear end. Side ears are fixedly set on the left and right sides of the front side of the lifting plate, and the hinge shaft passes through the side ears on the left and right sides of the lifting plate and is fixedly hinged to the left and right sides of the upper front side of the frame.

3. The harmless treatment device for complexation treatment of aluminum-chromium slag according to claim 1, characterized in that: The second lifting mechanism includes a fixed plate, which is laterally inclined and positioned at the middle of the rear side of the frame. The bottom of the hydraulic cylinder is fixed to the upper center of the fixed plate, and the upper part of the hydraulic cylinder is fixed to the bottom of the rear side of the cover plate. The cover plate is a square plate with an arc shape at the front end, and the partition is a U-shaped plate with an arc corner at the upper rear side. The partition is fixedly set at the middle of the upper part of the cover plate. The transmission port is opened at the middle of the bottom front side of the partition plate and is square in shape. The convex plate is fixedly set at the middle of the bottom rear side of the cover plate. The rear end face of the convex plate is aligned with the upper rear end face of the frame. There are two pins. One pin passes through the left rear side of the upper frame and is hinged to the left side of the convex plate. The other pin passes through the right rear side of the upper frame and is hinged to the right side of the convex plate.

4. The harmless treatment device for complexation treatment of aluminum-chromium slag according to claim 3, characterized in that: The cover plate includes a cover plate body, and a protruding ring is fixedly provided on the bottom front side of the cover plate body. The outer diameter of the protruding ring is smaller than the diameter of the complexing reaction cylinder. The protruding ring is concentric with the complexing reaction cylinder, and a gap is left between the cover plate body and the upper end face of the complexing reaction cylinder.

5. The harmless treatment device for complexation treatment of aluminum-chromium slag according to claim 1, characterized in that: The rotating mechanism is fixedly installed at the bottom of the lifting plate. The rotating mechanism includes a drive motor and a reducer as an integral structure. The drive motor and reducer are fixed at the bottom center of the lifting plate. The drive shaft is the output shaft of the reducer. The upper end of the drive shaft is installed in the inner ring of the slewing bearing. The outer ring of the slewing bearing is fixedly installed in the center mounting hole of the lifting plate. The drive shaft extends through the lifting plate to the upper part. The support plate is fixedly installed on the upper part of the drive shaft. The complexing reaction cylinder is fixed on the support plate.

6. The harmless treatment device for complexation treatment of aluminum-chromium slag according to claim 1, characterized in that: The synergistic stirring mechanism includes a motor, which is fixedly mounted on the rear side of the partition plate via a mounting plate. A pulley is fixed to the bottom of the motor's power output shaft. A driven pulley is fixed to the upper part of a shaft seat, which is fixed to the upper part of the cover plate near the front center. A stirring shaft is fixedly mounted at the bottom of the shaft seat and is fixedly mounted in the inner ring of the bearing of the shaft seat. The stirring shaft extends into the interior of the complexing reaction cylinder near the bottom, and the stirring shaft and the complexing reaction cylinder are concentric. A transmission belt is mounted on the pulley and the driven pulley, and the pulley and the driven pulley are driven by the transmission belt. Two stirring blades are arranged symmetrically in a group. One to three groups of stirring blades are staggered from top to bottom on the lower section of the stirring shaft. A scraper is located near the inner wall of the complexing reaction cylinder. The scraper includes a fixed seat, which is fixedly mounted on the upper part of the cover plate, located on the front side of the partition plate near the right side. The upper end of the mounting shaft is fixedly mounted in the inner ring of the bearing of the fixed seat, and the lower part of the mounting shaft extends into the interior of the complexing reaction cylinder near the bottom. Long strip-shaped scrapers are symmetrically arranged on the mounting shaft.

7. The harmless treatment device for complexation treatment of aluminum-chromium slag according to claim 1, characterized in that: The atomizing nozzle is fixedly mounted on the upper front side of the cover plate at the middle position via a mounting plate, and the nozzle of the atomizing nozzle extends inside the complexing reaction cylinder.

8. The harmless treatment device for complexation treatment of aluminum-chromium slag according to claim 1, characterized in that: The reversing solenoid valve includes a reversing solenoid valve body. The bottom of the reversing solenoid valve body is fixedly connected to the upper part of the atomizing nozzle. Input pipe one is fixedly located on the left side of the reversing solenoid valve body, and input pipe two is fixedly located on the right side of the reversing solenoid valve body. Input pipe one and input pipe two are connected to the interior of the reversing solenoid valve body. A valve core that can be electromagnetically reversed is provided in the reversing solenoid valve body.

9. The harmless treatment device for complexation treatment of aluminum-chromium slag according to claim 1, characterized in that: The tube coil includes a fixed plate, which is fixedly installed on the upper left or right side of the partition plate. A rotating shaft is fixedly installed on the outer end of the fixed plate. Bearings are symmetrically arranged on both sides of the center of the winding wheel. The rotating shaft extends through the symmetrically arranged bearings to the left side of the winding wheel. The rotating shaft is fixed to the inner ring of the bearing. An end cap is fixedly installed on the left end of the rotating shaft. The end cap is fixedly installed on the left end face of the winding wheel.

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