Electric arc furnace flue ash non-toxic treatment equipment

Abstract

The invention provides electric arc furnace flue ash non-toxic treatment equipment, and relates to the technical field of mixing equipment, the electric arc furnace flue ash non-toxic treatment equipment comprises a stirring tank used for containing flue ash and treatment liquid, a stirring device for controlling the flue ash and the treatment liquid to be mixed is arranged in the stirring tank, and a liquid inlet device for conveying the treatment liquid is arranged at the upper end of the stirring tank; a feeding device for conveying flue dust is arranged on the side wall of the stirring tank, the stirring device comprises a stirring rotating shaft and a stirring driving assembly for controlling the stirring rotating shaft to rotate, a plurality of stirring rods are fixed to the side wall of the stirring rotating shaft, and liquid dispersing pipelines located at the upper ends of the stirring rods are further fixed to the side wall of the stirring rotating shaft; a preset distance is formed between the liquid dispersing pipeline and the stirring rod to form a containing area, and the feeding device is located in the containing area and directionally inputs flue ash into the stirring tank. The flue ash non-toxic treatment efficiency can be improved, and the continuous mixing treatment effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of mixing equipment, and in particular to a non-toxic treatment device for flue ash from an electric arc furnace. Background Art

[0002] Electric arc furnace flue ash is one of the main solid wastes in the smelting process. It contains a lot of heavy metals and is highly corrosive, so it needs to be treated to be non-toxic.

[0003] Flue ash can be deeply treated by acid leaching or alkaline leaching of flue ash with alkaline solution or acid solution. On the one hand, some crude metals, such as metallic zinc, can be obtained; on the other hand, the toxicity of flue ash can be reduced, thus realizing resource utilization.

[0004] The traditional acid leaching or alkaline leaching process is to place the flue ash and the treatment liquid in a tank and stir them fully to ensure that the two are fully mixed, which can increase the reaction rate and improve the effect of the mixing treatment; however, due to the light weight of the flue ash, the flue ash put into the tank is easy to cause the flue ash to spread, affecting the working environment. At the same time, part of the flue ash adheres to the top of the inner wall of the tank, affecting its normal discharge in a single operation and affecting the continuous mixing treatment of the flue ash. Summary of the invention

[0005] In view of the above problems, the present invention provides an arc furnace flue ash detoxification treatment device, which can improve the efficiency of flue ash detoxification treatment and improve the effect of continuous mixing treatment.

[0006] To solve the above problems, the technical solution adopted by the present invention is: A non-toxic treatment device for flue ash of an electric arc furnace comprises a stirring tank for containing flue ash and a treatment liquid, wherein a stirring device for controlling the mixing of the two is arranged inside the stirring tank, a liquid inlet device for conveying the treatment liquid is arranged at the upper end of the stirring tank, and a feeding device for conveying the flue ash is arranged on the side wall of the stirring tank, wherein the stirring device comprises a stirring shaft and a stirring drive assembly for controlling the rotation of the stirring shaft, a plurality of stirring rods are fixed on the side wall of the stirring shaft, a liquid dispersion pipe located at the upper end of the stirring rod is also fixed on the side wall of the stirring shaft, a predetermined spacing is formed between the liquid dispersion pipe and the stirring rod to form a receiving area, and the feeding device is located in the receiving area and directional inputs the flue ash into the stirring tank; the liquid inlet device comprises a second liquid inlet assembly coaxially arranged with the stirring shaft, the second liquid inlet assembly comprises a liquid inlet pipe and a liquid inlet control valve body, a liquid dispersion chamber is formed inside the liquid dispersion pipe, a plurality of nozzles communicating with the liquid dispersion chamber are fixed on the lower end of the liquid dispersion pipe, and the liquid inlet control valve body is communicated with the liquid dispersion chamber to directional input the treatment liquid into the liquid dispersion chamber.

[0007] Preferably, the liquid inlet device further comprises a first liquid inlet component, and the first liquid inlet component is arranged at the upper end of the stirring tank and located outside the second liquid inlet component.

[0008] Preferably, the feeding device includes a feeding pipe, the feeding pipe is located on the outer side of the stirring tank and has a first feeding opening at the upper end, the feeding pipe is located on the inner side of the stirring tank and has a second feeding opening at the lower end, and a feeding auger for controlling the directional movement of flue ash is also provided in the feeding pipe.

[0009] Preferably, a sealing device located outside the second feed opening is provided on the outer side of the feed pipe, and the opening and closing of the second feed opening is controlled by the sealing device. The sealing device is linked with the liquid inlet control valve body through a linkage device. After the liquid inlet control valve body is opened, the second feed opening is controlled to be in a closed state through the sealing device.

[0010] Preferably, the sealing device comprises a sealing sleeve, the sealing sleeve is rotatably connected to the feed pipe, a material guide notch is formed at the lower end of the sealing sleeve, and the second feed opening is located on the rotation path of the material guide notch.

[0011] Preferably, the end portion of the sealing sleeve passes through the stirring tank and is sealed and rotatably connected thereto, and the linkage device includes a linkage mounting base, and the side wall of the linkage mounting base is rotatably connected to a linkage shaft fixedly connected to the liquid inlet control valve body, and the linkage shaft is connected to the outer wall of the sealing sleeve through the linkage transmission member.

[0012] Preferably, a liquid spraying pipeline is arranged outside the liquid dispersion pipeline, a magnetic control valve is installed inside the liquid spraying pipeline, at least two permanent magnets are embedded inside the sealing sleeve, the two permanent magnets have different attraction effects, the two permanent magnets are arranged at intervals, and the magnetic control valve is located on the deflection path of the permanent magnet.

[0013] Preferably, a discharge device for discharging materials is installed at the lower end of the mixing tank, and the discharge device includes a discharge pipe and a discharge opening and closing valve installed in the discharge pipe.

[0014] Preferably, the inner side of the feeding device extends in a direction perpendicular to the stirring shaft, and the inner end of the feeding device is opposite to the midpoint of the stirring rod.

[0015] The beneficial effects of the present invention are: Compared with the prior art, the above-mentioned structural design can optimize the placement of flue ash and treatment liquid, reducing the impact of flue ash placement on the working environment. At the same time, the treatment liquid sprayed from the top can accelerate the sedimentation of flue ash in the mixing tank, and at the same time can efficiently clean the corners in the mixing tank, thereby improving the efficiency of non-toxic treatment of flue ash and the effect of continuous mixing treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 For the present invention Figure 1 Schematic diagram of the top view structure.

[0018] Figure 3 For the present invention Figure 1 Schematic diagram of the main structure.

[0019] Figure 4 For the present invention Figure 3 AA section view of the structure.

[0020] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure at B.

[0021] In the figure: 100, support frame; 200, stirring tank; 300, first liquid inlet component; 400, second liquid inlet component; 410, liquid inlet pipeline; 420, liquid inlet control valve body; 500, stirring device; 510, stirring drive component; 520, stirring shaft; 530, liquid dispersion pipeline; 531, liquid dispersion chamber; 532, magnetic control valve; 533, liquid spray pipeline; 540, stirring rod; 600, linkage device; 610, linkage shaft; 620, linkage transmission member; 630, linkage mounting base; 700, feeding device; 710, feeding pipeline; 711, first feeding opening; 712, second feeding opening; 720, feeding auger; 730, sealing sleeve; 731, material guide notch; 800, unloading device; 810, unloading pipeline; 820, unloading opening and closing valve. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] In order to solve the problems mentioned in the background technology, Figure 1 -Attached Figure 5 A device for detoxicating flue ash of an electric arc furnace comprises a stirring tank 200 for containing flue ash and a treatment liquid. A stirring device 500 for controlling the mixing of the two is arranged inside the stirring tank 200. The treatment liquid and the flue ash are put into the stirring tank 200 and mixed under the action of the stirring device 500, thereby accelerating the reaction between the two and improving the mixing efficiency. The treatment liquid here is selected as an acid solution or an alkali solution according to the treatment needs.

[0024] A liquid inlet device for conveying treated liquid is provided at the upper end of the mixing tank 200, and a feeding device 700 for conveying flue ash is provided on the side wall of the mixing tank 200. Both the treated liquid and flue ash are conveyed into the mixing tank 200 through a relatively closed structure, thereby realizing automatic feeding and conveying, and avoiding the impact of flue ash diffusion on the surrounding working environment.

[0025] Specifically, the stirring device 500 includes a stirring shaft 520 and a stirring drive assembly 510 for controlling the rotation of the stirring shaft 520. A plurality of stirring rods 540 are fixed to the side wall of the stirring shaft 520. A liquid dispersion pipe 530 located at the upper end of the stirring rod 540 is also fixed to the side wall of the stirring shaft 520. The liquid dispersion pipe 530 and the stirring rod 540 here can be selected as multiple groups arranged circumferentially. A predetermined spacing is provided between the liquid dispersion pipe 530 and the stirring rod 540 to form a accommodating area. The feeding device 700 is located in the accommodating area and directional inputs flue ash into the stirring tank 200. The liquid dispersion pipe 530 and the stirring rod 540 here are both arranged horizontally. The area of ​​the accommodating area will not change during the rotation around the stirring shaft 520, and will not interfere with the feeding device 700, thereby ensuring the normal delivery of flue ash.

[0026] The liquid inlet device includes a second liquid inlet component 400 coaxially arranged with the stirring shaft 520, through which the treated liquid can be pumped into the stirring tank 200 to mix with the flue ash; the second liquid inlet component 400 includes a liquid inlet pipe 410 and a liquid inlet control valve body 420, a liquid dispersion chamber 531 is formed inside the liquid dispersion pipe 530, and a plurality of nozzles connected to the liquid dispersion chamber 531 are fixed at the lower end of the liquid dispersion pipe 530, and the treated liquid can be sprayed from the top of the stirring tank 200 through the nozzles, and the sprayed liquid is relatively dispersed and can be in a mist form; the liquid inlet control valve body 420 is connected to the liquid dispersion chamber 531 to directionally input the treated liquid into the liquid dispersion chamber 531.

[0027] After the flue ash is discharged into the mixing tank 200 through the feeding device 700, the feeding device 700 is closed and the treatment liquid is pumped into the mixing tank 200 from the top through the second liquid inlet component 400. The treatment liquid can be sprayed out from multiple nozzles. The sprayed treatment liquid can accelerate the sedimentation of the flue ash in the top part of the mixing tank 200 and accelerate the mixing process; at the same time, the continuously sprayed treatment liquid can also flush the flue ash attached to the inner wall of the mixing tank 200 or the upper end of the mixing device. In the discharge stage after the mixing is completed, the continuous spraying of the treatment liquid can achieve continuous cleaning of the inner wall of the mixing tank 200 to avoid continuous accumulation of mixed materials in the corners.

[0028] It should be noted that the treatment liquid here is pumped in twice. The first time, most of the treatment liquid can be pumped into the mixing tank 200 and located at the bottom of the mixing tank 200, and then the flue ash is put into the mixing tank 200 from the feeding device 700 to be fully mixed with the treatment liquid in the mixing tank 200; finally, the remaining treatment liquid is pumped in through the second liquid inlet component 400 and the liquid dispersion pipe 530, which can settle the flue ash and clean the related structures of the inner wall of the mixing tank 200, thereby ensuring the continuity and efficiency of the non-toxic treatment of the flue ash.

[0029] In summary, through the above-mentioned structural design, the placement of flue ash and treatment liquid can be optimized, and the impact of flue ash placement on the working environment is reduced. At the same time, the treatment liquid sprayed from the top can accelerate the sedimentation of flue ash in the mixing tank 200, and at the same time can efficiently clean the corners in the mixing tank 200, thereby accelerating the efficiency of non-toxic treatment of flue ash and improving the effect of continuous mixing treatment.

[0030] Specifically, the liquid inlet device also includes a first liquid inlet component 300, which is arranged at the upper end of the stirring tank 200 and located on the outside of the second liquid inlet component 400. For the first time, a large amount of treated liquid can be quickly pumped into the stirring tank 200 through the first liquid inlet component 300, thereby improving the efficiency of pumping the treated liquid.

[0031] Specifically, the feeding device 700 includes a feeding pipe 710, which is located at the upper end of the outer side of the mixing tank 200 and has a first feeding opening 711, and the feeding pipe 710 is located at the lower end of the inner side of the mixing tank 200 and has a second feeding opening 712. A feeding auger 720 for controlling the directional movement of flue ash is also provided in the feeding pipe 710.

[0032] During the process of delivering flue ash, controlling the continuous directional rotation of the feeding auger 720 can control the directional movement of the flue ash in the feeding pipe 710. The first feeding opening 711 here can be connected to a storage tank, and the flue ash can fall into the feeding pipe 710 under the action of gravity. During the directional rotation of the feeding auger 720, the directional movement of the flue ash in the feeding pipe 710 is controlled, and finally the flue ash is discharged from the second feeding opening 712 and falls into the mixing tank 200 to complete the delivery.

[0033] The second feed opening 712 here opens downward, which can reduce the impact of the treatment liquid sprayed from the top on the second feed opening 712, avoid excessive crusting inside, and avoid affecting the normal discharge of flue ash.

[0034] In order to further reduce the impact of the treatment liquid sprayed from the top on the second feed opening 712, a sealing device located on the outside of the second feed opening 712 is sleeved on the outside of the feed pipe 710, and the opening and closing of the second feed opening 712 is controlled by the sealing device. When the treatment liquid is sprayed, the second feed opening 712 is closed by the sealing device, which can prevent the atomized liquid from entering the second feed opening 712 and mixing with the internal flue ash, thereby ensuring overall stability.

[0035] In addition, the sealing device is linked with the liquid inlet control valve body 420 through the linkage device 600. After the liquid inlet control valve body 420 is opened, the second feed opening 712 is controlled to be in a closed state through the sealing device. Through the above-mentioned structural design, the sealing device is controlled to be closed during the opening of the liquid inlet control valve body 420, and the second feed opening 712 is controlled to be opened when the liquid inlet control valve body 420 is closed to realize the normal discharge of flue ash.

[0036] The sealing device includes a sealing sleeve 730, which is rotatably connected to the feed pipe 710. A material guide notch 731 is provided at the lower end of the sealing sleeve 730, and the second feed opening 712 is located on the rotation path of the material guide notch 731. The sealing sleeve 730 is rotatably connected to the outer wall of the feed pipe 710 in a sealed manner, and the rotating material guide notch 731 is opposite to the second feed opening 712. Flue ash can be discharged from the lower end under the action of gravity. The two are controlled to be staggered, and the second feed opening 712 can be closed by the sealing sleeve 730 to prevent the entry of atomized treatment liquid from the outside.

[0037] The end portion of the sealing sleeve 730 passes through the stirring tank 200 and is sealed and rotatably connected thereto. The linkage device 600 includes a linkage mounting base 630. The side wall of the linkage mounting base 630 is rotatably connected to a linkage shaft 610 fixedly connected to the liquid inlet control valve body 420. The linkage shaft 610 is connected to the outer wall of the sealing sleeve 730 through a linkage transmission member 620. The linkage shaft 610 here is electrically driven to rotate. By controlling the rotation of the linkage shaft 610, the first side of the linkage shaft 610 is directly fixed to the liquid inlet control valve body 420, and the liquid inlet control valve body 420 can be controlled to deflect around the linkage shaft 610 by a predetermined angle. The liquid inlet control valve body 420 here can be selected as a ball valve, which can be rotated to different positions to complete the opening and closing control.

[0038] The second end of the linkage shaft 610 can drive the sealing sleeve 730 to rotate through the linkage transmission member 620. The linkage transmission member 620 here can be selected as a belt conveyor assembly. According to the required deflection angle between the liquid inlet control valve body 420 and the sealing sleeve 730, the size of the two pulleys is controlled to achieve the opening and closing control of the opposite states of the liquid inlet control valve body 420 and the sealing sleeve 730.

[0039] A liquid spraying pipe 533 is arranged on the outside of the liquid dispersion pipe 530, and a magnetic control valve 532 is installed inside the liquid spraying pipe 533. By controlling 532 to open part of the treated liquid in the liquid dispersion chamber 531, part of the treated liquid can be discharged from the liquid spraying pipe 533, and the discharged treated liquid can directly act on the inner wall of the stirring tank 200, so as to achieve efficient cleaning of the inner wall of the stirring tank 200; controlling the magnetic control valve to be in a closed state can avoid the liquid from being discharged from the liquid spraying pipe 533, so that more liquid can be discharged through the nozzle in atomization, which can improve the sedimentation effect of the flue ash floating in the stirring tank 200.

[0040] At least two permanent magnets are embedded in the sealing sleeve 730. The two permanent magnets have different attractive effects. The two permanent magnets are arranged at intervals, and the magnetron valve 532 is located on the deflection path of the permanent magnet. The magnetic poles of the two permanent magnets are arranged oppositely. By controlling the first permanent magnet to be opposite to the magnetron valve, the magnetron valve can be controlled to open; by controlling the second permanent magnet to be opposite to the magnetron valve, the magnetron valve can be controlled to close; according to different processing stages, different permanent magnets are controlled to be opposite to the magnetron valve to achieve regulation control.

[0041] During the control process, the sealing sleeve 730 is controlled to continue to rotate in the closing direction in the closed state. Under the premise of ensuring that the second feed opening 712 is closed, the normal discharge of the treatment liquid can be guaranteed; at the same time, when the sealing sleeve 730 and the liquid inlet control valve body 420 are deflected to different positions, the amount of treatment liquid sprayed and the spraying method can be adaptively adjusted to meet the operation requirements at different stages.

[0042] When the treatment liquid is in a completely atomized state, the opening of the liquid inlet control valve body 420 is controlled to be smaller, which can reduce the pressure of the internal structure; when the treatment liquid is in atomization and is also sprayed out from the outer spray pipe 533, the opening of the liquid inlet control valve body 420 is controlled to be larger, which can meet the needs of the treatment liquid spraying amount.

[0043] A discharge device 800 for discharging is installed at the lower end of the mixing tank 200. The discharge device 800 includes a discharge pipe 810 and a discharge opening and closing valve 820 installed in the discharge pipe 810. The discharge opening and closing valve 820 here can be selected as a gate valve. The discharge opening and closing valve 820 is controlled to be closed during the mixing and stirring stage to avoid the discharge of the mixed medium. After the mixing and stirring is completed, the discharge opening and closing valve 820 is controlled to be opened, and the fully mixed medium can be discharged from the discharge pipe 810. The mixing tank 200 is emptied to prepare for the subsequent treatment of flue ash.

[0044] The inner side of the feeding device 700 here extends in a direction perpendicular to the stirring shaft 520, and the inner end of the feeding device 700 is opposite to the midpoint of the stirring rod 540. Through the above-mentioned structural design, the discharged flue ash can contact the stirring rod 540 under the action of gravity, and the rotating stirring rod 540 can break up and disperse the flue ash, and the flue ash can be mixed with the treatment liquid relatively evenly, thereby further improving the efficiency of flue ash treatment.

[0045] Here, the feeding device 700 can be arranged in several groups around the mixing tank 200, and the flue ash is discharged from multiple directions, which further ensures the uniformity of the flue ash delivery.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An arc furnace flue ash detoxification treatment device, comprising a stirring tank (200) for containing flue ash and a treatment liquid, wherein a stirring device (500) for controlling the mixing of the two is arranged inside the stirring tank (200), a liquid inlet device for conveying the treatment liquid is arranged at the upper end of the stirring tank (200), and a feeding device (700) for conveying the flue ash is arranged on the side wall of the stirring tank (200), characterized in that: The stirring device (500) comprises a stirring shaft (520) and a stirring drive assembly (510) for controlling the rotation of the stirring shaft (520); a plurality of stirring rods (540) are fixed to the side wall of the stirring shaft (520); a liquid dispersion pipe (530) located at the upper end of the stirring rod (540) is also fixed to the side wall of the stirring shaft (520); a predetermined spacing is provided between the liquid dispersion pipe (530) and the stirring rod (540) to form a receiving area; the feeding device (700) is located in the receiving area and directionally inputs flue ash into the stirring tank (200); The liquid inlet device comprises a second liquid inlet component (400) arranged coaxially with the stirring shaft (520), the second liquid inlet component (400) comprises a liquid inlet pipe (410) and a liquid inlet control valve body (420), a liquid dispersion chamber (531) is formed inside the liquid dispersion pipe (530), a plurality of nozzles connected to the liquid dispersion chamber (531) are fixed at the lower end of the liquid dispersion pipe (530), and the liquid inlet control valve body (420) is connected to the liquid dispersion chamber (531) to directionally input the treatment liquid into the liquid dispersion chamber (531).

2. The arc furnace flue ash detoxification treatment equipment according to claim 1 is characterized in that: The liquid inlet device further comprises a first liquid inlet component (300), wherein the first liquid inlet component (300) is arranged at the upper end of the stirring tank (200) and is located outside the second liquid inlet component (400).

3. The arc furnace flue ash detoxification treatment equipment according to claim 1 is characterized in that: The feeding device (700) comprises a feeding pipe (710), wherein the feeding pipe (710) is located on the outer side of the stirring tank (200) and has a first feeding opening (711) at its upper end, and the feeding pipe (710) is located on the inner side of the stirring tank (200) and has a second feeding opening (712) at its lower end. A feeding auger (720) for controlling the directional movement of flue ash is also arranged in the feeding pipe (710).

4. The arc furnace flue ash detoxification treatment equipment according to claim 3 is characterized in that: The outer side of the feed pipe (710) is provided with a sealing device located outside the second feed opening (712), and the opening and closing of the second feed opening (712) are controlled by the sealing device. The sealing device is linked with the liquid inlet control valve body (420) via a linkage device (600). After the liquid inlet control valve body (420) is opened, the second feed opening (712) is controlled to be in a closed state through the sealing device.

5. The arc furnace flue ash detoxification treatment equipment according to claim 4, characterized in that: The sealing device comprises a sealing sleeve (730), the sealing sleeve (730) being rotatably connected to the feed pipe (710), a material guide notch (731) being provided at the lower end of the sealing sleeve (730), and the second feed opening (712) being located on the rotation path of the material guide notch (731).

6. The arc furnace flue ash detoxification treatment equipment according to claim 5, characterized in that: The end portion of the sealing sleeve (730) passes through the stirring tank (200) and is rotatably connected thereto in a sealed manner. The linkage device (600) comprises a linkage mounting base (630). A side wall of the linkage mounting base (630) is rotatably connected to a linkage rotating shaft (610) fixedly connected to the liquid inlet control valve body (420). The linkage rotating shaft (610) is connected to the outer wall of the sealing sleeve (730) via the linkage transmission member (620).

7. The arc furnace flue ash detoxification treatment equipment according to claim 5, characterized in that: A liquid spraying pipeline (533) is arranged outside the liquid dispersion pipeline (530), a magnetic control valve (532) is installed inside the liquid spraying pipeline (533), at least two permanent magnets are embedded inside the sealing sleeve (730), the two permanent magnets have different attractive effects, the two permanent magnets are arranged at intervals, and the magnetic control valve (532) is located on the deflection path of the permanent magnet.

8. The arc furnace flue ash detoxification treatment equipment according to claim 1, characterized in that: A material discharge device (800) for discharging material is installed at the lower end of the mixing tank (200), and the material discharge device (800) comprises a material discharge pipeline (810) and a material discharge opening and closing valve (820) installed in the material discharge pipeline (810).

9. The arc furnace flue ash detoxification treatment equipment according to claim 1, characterized in that: The inner side of the feeding device (700) extends in a direction perpendicular to the stirring shaft (520), and the inner end of the feeding device (700) is opposite to the midpoint of the stirring rod (540).

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