Resource recycling method of fly ash and carbide slag

Abstract

The invention provides a resource recycling method of fly ash and carbide slag, and relates to the technical field of solid waste resource utilization. A resource recycling method of fly ash and carbide slag comprises the following steps: step S1, fly ash pretreatment: fly ash is ground and sieved by a superfine ball mill, unburnt carbon particles are removed, and fine-particle fly ash is obtained; s2, magnetic separation: carrying out magnetic separation on the fine-particle fly ash by using a high-gradient magnetic separator to obtain a magnetic substance and iron-removed fly ash; step S3, mixing treatment; step S4, carrying out carbonization treatment; and step S5, causticizing treatment. Through cooperative treatment of the fly ash and the carbide slag, efficient recovery of iron, gallium and potassium is realized, and meanwhile, a silicon fertilizer is generated; the alkali liquor product can be recycled in the system process, so that no waste residue or waste water is generated in the whole process, and the aims of energy conservation, environmental protection and zero emission are fulfilled.

Description

Technical Field

[0001] This invention relates to the field of solid waste resource utilization technology, and in particular to a method for the resource recycling of fly ash and carbide slag. Background Technology

[0002] With the rapid development of industry, the discharge of solid wastes such as fly ash and carbide slag is increasing day by day, putting enormous pressure on the environment. Brown fly ash contains a certain amount of valuable elements such as gallium and potassium, as well as silicon components that can be used to prepare silicon fertilizer. However, its comprehensive utilization rate is currently low, and the treatment process often results in environmental pollution and resource waste.

[0003] As a byproduct of industries such as polyvinyl chloride (PVC), calcium carbide slag is mainly composed of calcium hydroxide. Traditional treatment methods, such as stockpiling or simple utilization, not only occupy land but may also cause secondary pollution. Further research is needed to determine how to reduce emissions and achieve resource recycling when treating brown fly ash and calcium carbide slag.

[0004] Therefore, it is necessary to provide a resource-based recycling method for fly ash and carbide slag to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a method for the resource recycling of fly ash and carbide slag, which solves the problem in related technologies of how to reduce emissions while achieving resource recycling when treating brown fly ash and carbide slag, a problem that requires further research.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for the resource-based recycling of fly ash and carbide slag, comprising the following steps:

[0007] Step S1, fly ash pretreatment: Grind the fly ash using an ultrafine ball mill, sieve it to remove unburned carbon particles, and obtain fine-particle fly ash.

[0008] Step S2, magnetic separation: fine fly ash particles are separated by a high gradient magnetic separator to obtain magnetic materials and de-ironized fly ash.

[0009] Step S3, mixing treatment: the calcium carbide slag and de-ironized fly ash used as calcium source are mixed, potassium hydroxide solution is added and heated in a heat treatment device to obtain filtrate A and active calcium silicate powder.

[0010] Step S4, carbonization treatment: Pour filtrate A into a sealed reaction vessel, introduce carbon dioxide and pressurize to carry out carbonization precipitation, filter, and obtain gallium aluminum coprecipitate and filtrate B;

[0011] Step S5, causticization treatment: Mix filtrate B and carbide slag, carry out causticization reaction, filter, and obtain regenerated potassium hydroxide solution and residue.

[0012] Preferably, the particle size of the particles ground in step S1 is ≤10μm.

[0013] Preferably, the magnetic field strength during magnetic separation in step S2 is 1.2T.

[0014] Preferably, in step S3, the carbide slag and de-ironized fly ash are mixed at a Ca / Si molar ratio of 0.9.

[0015] Preferably, in step S3, the potassium hydroxide solution is added at a concentration of 10 g / L, and the heating reaction is carried out at 180°C for 2 hours, followed by rapid cooling and filtration.

[0016] Preferably, in step S3, filtrate A is rich in gallium, potassium, and aluminum.

[0017] Preferably, the active calcium silicate powder is used in the preparation of silicon fertilizer.

[0018] Preferably, the carbonization precipitation in step S4 is carried out at a temperature of 90°C, pressurized to 1.5 MPa, and for a reaction time of 1 hour.

[0019] Preferably, the gallium-aluminum coprecipitate is further separated and purified for the recovery of gallium and aluminum products.

[0020] Preferably, the residue in step S5 is reused in the mixing of carbide slag and de-ironized fly ash in step S3.

[0021] Compared with related technologies, the resource recycling method for fly ash and carbide slag provided by this invention has the following beneficial effects:

[0022] Through the synergistic treatment of fly ash and carbide slag, the efficient recovery of iron, gallium, and potassium is achieved, while silicon fertilizer is produced. The alkaline products can be recycled in the system process, so that no waste residue or wastewater is generated in the whole process, achieving the goals of energy conservation, environmental protection and zero emissions. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A flowchart of the resource recycling method for fly ash and carbide slag provided by the present invention;

[0025] Figure 2A three-dimensional view of a first embodiment of the heat treatment equipment provided by the present invention;

[0026] Figure 3 for Figure 2 A schematic diagram of the structure of section AA shown;

[0027] Figure 4 for Figure 3 An enlarged structural diagram of section B is shown below;

[0028] Figure 5 for Figure 3 Top view of the sectional structure of the rotating disk shown;

[0029] Figure 6 This is a schematic diagram of the heat treatment equipment provided by the present invention, wherein, Figure 6 (a) is a top view of the processing tank located in the heat treatment zone. Figure 6 Image (b) is a top view of the processing tank rotating from the heat treatment zone toward the discharge zone. Figure 6 (c) in the figure is a top view of the contact state between the slide rod and the transmission cam. Figure 6 (d) in the figure is a top view of the slide rod in full contact with the transmission protrusion;

[0030] Figure 7 A three-dimensional view of a second embodiment of the heat treatment equipment provided by the present invention;

[0031] Figure 8 for Figure 7 An enlarged structural diagram of section C is shown below;

[0032] Figure 9 for Figure 7 Left view of the entire structure shown;

[0033] Figure 10 for Figure 9 The diagram shows the structure of the third driving component in an avoidance state.

[0034] Explanation of icon numbers:

[0035] 1. Support assembly; 11. Base; 111. Support shaft; 12. Fixing plate; 121. First feed pipe; 122. Second feed pipe;

[0036] 2. Rotating assembly; 21. Rotating cover; 22. Rotating frame; 23. First driving component; 24. First gear; 25. First gear ring;

[0037] 3. Processing tank; 301. Discharge port; 31. Switching component; 311. Elastic retractable component; 312. Slide rod; 313. Switch plate; 314. Rotary disk; 315. Transmission protrusion;

[0038] 4. Lifting assembly; 41. Limiting bracket; 42. Second drive component; 43. Lead screw; 44. Threaded slide;

[0039] 5. Electric heating device;

[0040] 6. Stirring assembly; 61. Box body; 62. Stirring rod; 63. First bevel gear; 64. Rotating shaft; 65. Second bevel gear; 66. Third bevel gear;

[0041] 7. Drive assembly; 71. Stand; 72. Third drive component; 73. Fourth bevel gear;

[0042] 8. Receiving pool;

[0043] 100. First feeding area; 200. Second feeding area; 300. Heat treatment area; 400. Discharge area;

[0044] 221. Second gear ring;

[0045] 731. The second gear.

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0048] This invention provides a method for the resource recycling of fly ash and carbide slag.

[0049] Please see Figure 1 The method for resource recycling of fly ash and carbide slag in this invention includes the following steps:

[0050] Step S1, fly ash pretreatment: Grind the fly ash using an ultrafine ball mill, sieve it to remove unburned carbon particles, and obtain fine-particle fly ash.

[0051] Step S2, magnetic separation: fine fly ash particles are separated by a high gradient magnetic separator to obtain magnetic materials and de-ironized fly ash.

[0052] Step S3, mixing treatment: the calcium carbide slag and de-ironized fly ash used as calcium source are mixed, potassium hydroxide solution is added and heated in a heat treatment device to obtain filtrate A and active calcium silicate powder.

[0053] Step S4, carbonization treatment: Pour filtrate A into a sealed reaction vessel, introduce carbon dioxide and pressurize to carry out carbonization precipitation, filter, and obtain gallium aluminum coprecipitate and filtrate B;

[0054] Step S5, causticization treatment: Mix filtrate B and carbide slag, carry out causticization reaction, filter, and obtain regenerated potassium hydroxide solution and residue.

[0055] Specifically, the particle size ground in step S1 is ≤10μm.

[0056] Specifically, the magnetic field strength during magnetic separation in step S2 is 1.2T.

[0057] Specifically, the magnetic materials in step S2 are mainly Fe3O4 and Fe2O3.

[0058] Specifically, in step S3, the carbide slag and de-ironized fly ash are mixed at a Ca / Si molar ratio of 0.9.

[0059] Specifically, the potassium hydroxide solution is added at a concentration of 10 g / L, and the heating reaction is carried out at 180°C for 2 hours, followed by rapid cooling and filtration.

[0060] Specifically, the filtrate A is mainly rich in gallium, potassium and aluminum.

[0061] Specifically, the active calcium silicate powder can be used as a silicon fertilizer.

[0062] Specifically, in step S4, the carbonization precipitation temperature is 90°C, the pressure is increased to 1.5 MPa, and the reaction time is 1 hour.

[0063] Specifically, the gallium-aluminum coprecipitate can be further separated and purified to recover high-purity gallium and aluminum products.

[0064] Specifically, the causticization reaction enables the recycling of the alkali solution, and the residue, as the remaining part of the carbide slag, can be mixed with the carbide slag and de-ironized fly ash from step S3 to achieve resource recycling.

[0065] Application prospects:

[0066] With advantages such as simple process flow, mild operating conditions, and significant economic benefits, it has broad application prospects.

[0067] Beneficial effects:

[0068] Through the synergistic treatment of fly ash and carbide slag, the efficient recovery of iron, gallium, and potassium is achieved, while silicon fertilizer is produced. The alkaline products can be recycled in the system process, so that no waste residue or wastewater is generated in the whole process, achieving the goals of energy conservation, environmental protection and zero emissions.

[0069] Case 1:

[0070] Step 1: Grind the fly ash with an ultrafine ball mill until the particle size is ≤10μm, sieve it to remove unburned carbon particles, and obtain fine fly ash particles;

[0071] Step 2: Fine fly ash particles are separated by a high gradient magnetic separator with a magnetic field strength of 1.2T to obtain magnetic materials (Fe3O4, Fe2O3) and de-ironized fly ash;

[0072] Step 3: Mix the calcium carbide slag and de-ferroalved fly ash as calcium sources at a Ca / Si molar ratio of 0.9, add 10 g / L potassium hydroxide solution, react at 180℃ for 2 h, cool rapidly, and filter to obtain filtrate A containing gallium, potassium, and aluminum, and activated calcium silicate powder; the activated calcium silicate powder can be used as silicon fertilizer.

[0073] Step 4: Pour the filtrate A containing gallium, potassium and aluminum into a sealed reaction vessel, heat to 90°C, introduce carbon dioxide, pressurize to 1.5 MPa, and heat for 1 hour to carry out carbonization precipitation, filter, and obtain gallium-aluminum coprecipitate and filtrate B; the gallium-aluminum coprecipitate can be further separated and purified to recover high-purity gallium and aluminum products.

[0074] Step 5: Mix filtrate B and carbide slag with a Ca / K molar ratio of 1.2, and carry out a causticizing reaction at room temperature for 1 hour. Filter to obtain regenerated potassium hydroxide solution C and residue. This step enables the recycling of the alkali solution, and the residue, as the remaining part of the carbide slag, can be mixed with the carbide slag and de-ironized fly ash from step 3 for recycling.

[0075] This invention provides a heat treatment device.

[0076] First embodiment:

[0077] Please refer to the following: Figures 2 to 5 In this invention, the heat treatment equipment includes:

[0078] Support assembly 1, the support assembly 1 includes a base 11 and a fixed plate 12, the fixed plate 12 is fixed on the base 11 by a support shaft 111, and a first feed pipe 121 and a second feed pipe 122 are respectively provided on the fixed plate 12;

[0079] The rotating assembly 2 includes a rotating cover 21, a rotating frame 22, a first driving member 23, a first gear 24, and a first gear ring 25. The rotating cover 21 is sleeved on the support shaft 111 and rotatably connected. The rotating frame 22 is fixed on the rotating cover 21. The bottom of the rotating cover 21 passes through the base 11 and is rotatably connected. The fixing part of the first driving member 23 is fixed inside the base 11. The first gear 24 is fixed on the driving part of the first driving member 23. The first gear ring 25 is fixed on the rotating cover 21, and the first gear 24 and the first gear ring 25 mesh with each other.

[0080] Four processing tanks 3 are evenly fixed on the rotating frame 22. The top of each processing tank 3 is slidably sealed to the bottom of the fixed plate 12. The rotation range of the feed inlet of each processing tank 3 is aligned with the first feed pipe 121 and the second feed pipe 122, respectively. A discharge port 301 is provided at the bottom of each processing tank 3. A switch 31 is provided on each processing tank 3 to control the opening and closing of the discharge port 301.

[0081] Lifting assembly 4 is mounted on the base 11 and is used to control the lifting and adjusting of the electric heating device 5.

[0082] A stirring assembly 6 is provided, which is arranged in a one-to-one correspondence with the processing tank 3. The stirring assembly 6 includes a box body 61, a stirring rod 62, a first bevel gear 63, a rotating shaft 64, a second bevel gear 65, and a third bevel gear 66. The box body 61 is fixed inside the processing tank 3. The top of the stirring rod 62 passes through the box body 61 and is rotatably connected to it. The first bevel gear 63 is fixed to the top of the stirring rod 62. One end of the rotating shaft 64 is fixedly connected to the second bevel gear 65. The second bevel gear 65 meshes with the first bevel gear 63. The other end of the rotating shaft 64 passes through the box body 61 and the processing tank 3 and is fixedly connected to the third bevel gear 66. The rotating shaft 64 is rotatably mounted on the box body 61 and the processing tank 3.

[0083] The drive assembly 7 includes a frame 71, a third drive member 72, and a fourth bevel gear 73. The frame 71 is fixed to the telescopic part of the lifting assembly 4. The fixed part of the third drive member 72 is fixed to the frame 71. The fourth bevel gear 73 is fixed to the drive part of the third drive member 72. When the third drive member 72 is in the working state, the fourth bevel gear 73 is meshed with the third bevel gear 66.

[0084] The base 11 has a first feeding area 100, a second feeding area 200, a heat treatment area 300 and a discharge area 400 on its top. The first feeding pipe 121 is correspondingly arranged on the first feeding area 100, the second feeding pipe 122 is correspondingly arranged on the second feeding area 200, the electric heating device 5 is correspondingly arranged on the heat treatment area 300, and a receiving pool 8 is correspondingly arranged within the discharge area 400. The bottom of the receiving pool 8 is fixed on the base 11.

[0085] In this embodiment, the electric heating device 5 adopts an existing resistance heating system. The heating principle is as follows: after the electrical energy is converted into heat energy (which will not be elaborated here), the temperature is transferred to the bottom of the processing tank 3 after contact. The bottom of the processing tank 3 adopts a heat-conducting structure to facilitate heating of the inside of the processing tank 3 after the electric heating device 5 comes into contact with the bottom of the processing tank 3.

[0086] In this embodiment, the first driving component 23 can be a motor structure, used to control the rotation adjustment of the rotating frame 22 and the rotating cover 21 on the support shaft 111; the third driving component 72 can be a motor structure, used to control the rotation adjustment of the stirring rod 62.

[0087] Within the range corresponding to the first feeding zone 100, when the feed inlet of the processing tank 3 is aligned vertically with the first feed pipe 121, it is convenient to inject the first batch of materials (carbide slag and de-iron fly ash) into the processing tank 3 through the first feed pipe 121.

[0088] Within the corresponding range of the second feeding zone 200, when the feed inlet of the processing tank 3 is aligned vertically with the second feed pipe 122, it is convenient to inject the second batch of material (potassium hydroxide solution) into the processing tank 3 through the second feed pipe 122.

[0089] Within the corresponding area of ​​the heat treatment zone 300, the feed inlet of the treatment tank 3 is closed, and the bottom of the treatment tank 3 is aligned with the lifting range of the electric heating device 5, so that the treatment tank 3 can be heated when the electric heating device 5 comes into contact with the bottom of the treatment tank 3, so as to facilitate the heat treatment of the material in the treatment tank 3.

[0090] Within the corresponding area of ​​the discharge zone 400, the inlet of the processing tank 3 is closed, and the discharge port 301 is aligned directly above the receiving pool 8. The discharge port 301 is opened by the switch 31 so that the material in the processing tank 3 can be discharged downward into the receiving pool 8.

[0091] The electric heating device 5 includes two operating modes:

[0092] In the docking mode, within the heat treatment zone 300, the bottom of the treatment tank 3 is inserted into and abuts against the electric heating device 5, and the treatment tank 3 is locked to facilitate heating treatment of the treatment tank 3 by the electric heating device 5; the output end of the first feed pipe 121 is vertically aligned and connected with the feed inlet of the treatment tank 3 corresponding to the first feed zone 100, and the output end of the second feed pipe 122 is vertically aligned and connected with the feed inlet of the treatment tank 3 corresponding to the second feed zone 200; the third bevel gear 66 and the fourth bevel gear 73 are docked and meshed; at this time, the third drive member 72 is in the docking state; the treatment tank 3 corresponding to the discharge zone 400 is aligned directly above the receiving pool 8;

[0093] In the avoidance mode, the electric heating device 5 is separated from the processing tank 3, the third bevel gear 66 is separated from the fourth bevel gear 73, and the third driving component 72 is in an avoidance state, thereby unlocking the processing tank 3 so that the processing tank 3 can switch workstations.

[0094] The lifting assembly 4 facilitates the docking and locking of the electric heating device 5 and the processing tank 3; so that under the working conditions of one electric heating device 5, it can adapt to the heat treatment of four processing tanks 3; while the processing tank 3 is heated within the heat treatment zone 300, the first batch and the second batch of materials can be put in at the same time, and the materials after heat treatment can be discharged.

[0095] At the same time, the lifting assembly 4 also drives the platform 71, the third drive member 72 and the fourth bevel gear 73 to move upward, so that the fourth bevel gear 73 and the third bevel gear 66 mesh together, so as to adapt to the stirring and processing of materials within the range of the four processing tanks 3 under the control of the third drive member 72.

[0096] In this embodiment, when the first driving member 23 controls the rotation of the rotating frame 22 and the processing tank 3, the angle of rotation of the processing tank 3 relative to the fixed disk 12 is 90° each time.

[0097] In this embodiment, when the third driving member 72 controls the rotation adjustment of the fourth bevel gear 73, the rotation cycle of the fourth bevel gear 73 is 360°, and it can maintain the 360° state each time it stops rotating.

[0098] In an optional embodiment of this example, the switch 31 can be a solenoid valve, used to directly control the opening and closing of the discharge port 301. When the switch 31 is a solenoid valve, the number of switch 31 is equal to the number of processing tanks 3, and they are arranged in a one-to-one correspondence, with each discharge port 301 controlled individually.

[0099] In another optional implementation of this embodiment, please refer to the following: Figure 2 , Figure 3 and Figure 4 The switching component 31 includes an elastic retractable component 311, a slide rod 312, a switch plate 313, a rotating disk 314, and a transmission protrusion 315. The fixed part of the elastic retractable component 311 is fixed to the processing tank 3. The retractable part of the elastic retractable component 311 passes through the processing tank 3 and is fixedly connected to the top of the slide rod 312. The bottom of the slide rod 312 is fixedly provided with the switch plate 313, which blocks the discharge port 301. The bottom of the rotating disk 314 is fixed to the base 11 by a fixing rod. The rotating disk 314 is arranged around the outside of the rotating cover 21. The transmission protrusion 315 is fixed inside the rotating disk 314. One end of the slide rod 312 passes through the processing tank 3 and is inserted into the rotating disk 314 and slidably connected.

[0100] The number of the elastic retractable member 311, the slide bar 312, the switch plate 313 and the discharge port 301 are equal, and the four are arranged in a one-to-one correspondence.

[0101] In this embodiment, the transmission protrusion 315 is aligned within the discharge area 400. Only when the processing tank 3 rotates into the discharge area 400 will the slide rod 312 fully abut against the transmission protrusion 315, and the switch plate 313 will separate from the discharge port 301, thereby opening the discharge port 301.

[0102] During the switching process of the processing tank 3, the processing tank 3 synchronously drives the slide bar 312 to rotate around the rotating disk 314. When the slide bar 312 abuts against the transmission protrusion 315, the slide bar 312 adaptively drives the switch plate 313 to extend relative to the processing tank 3 and separate from the discharge port 301, so that after the processing tank 3 rotates from the heat treatment zone 300 to the discharge zone 400, the discharge port 301 is adaptively controlled to open, so that the heat-treated material is automatically discharged into the receiving pool 8.

[0103] In a preferred embodiment of this example, the lifting component 4 can be a hydraulic telescopic cylinder. The fixed part of the lifting component 4 is fixedly mounted on the base 11. The telescopic part of the lifting component 4 is fixedly connected to the electric heating device 5 and the platform 71 respectively, so as to facilitate direct driving of the electric heating device 5 and the platform 71 for lifting and adjustment.

[0104] In another preferred embodiment of this example, please refer again. Figure 2The lifting assembly 4 includes a limiting frame 41, a second driving member 42, a lead screw 43, and a threaded slide 44. The limiting frame 41 is fixed on the base 11. The fixing part of the second driving member 42 is fixed on the base 11. The bottom of the lead screw 43 passes through the base 11 and is fixedly connected to the second driving member 42. The threaded slide 44 is slidably mounted on the limiting frame 41. The top of the lead screw 43 passes through the threaded slide 44 and is threadedly connected. The threaded slide 44 is fixedly connected to the electric heating device 5. The bottom of the platform 71 is fixedly connected to the top of the threaded slide 44.

[0105] In this embodiment, the second driving component 42 can be a motor structure, used to directly drive the lead screw 43 to rotate. When the lead screw 43 rotates, it is convenient to control the lifting and adjusting of the threaded slide 44, thereby providing the power for the lifting and adjusting of the electric heating device 5 and the driving assembly 7 as a whole.

[0106] When it is necessary to switch the processing tank 3 to a different workstation, the second drive unit 42 is activated. The second drive unit 42 controls the threaded slide 44 to move downward through the lead screw 43. The threaded slide 44 drives the electric heating device 5 and the drive assembly 7 to move downward as a whole. On the one hand, it controls the electric heating device 5 to separate from the processing tank 3; on the other hand, it controls the fourth bevel gear 73 to separate from the third bevel gear 66, providing clearance for the subsequent workstation switching of the processing tank 3.

[0107] After the processing tank 3 completes the station switching, the second drive unit 42 is activated. The second drive unit 42 controls the threaded slide 44 to move upward through the lead screw 43. The threaded slide 44 drives the electric heating device 5 and the drive assembly 7 to move upward as a whole. On the one hand, it controls the electric heating device 5 to dock and lock with the processing tank 3, which facilitates the heating treatment of the processing tank 3. On the other hand, it controls the fourth bevel gear 73 to dock and mesh with the third bevel gear 66, so that the stirring rod 62 can be rotated by the third drive unit 72 to provide stirring support for the heated material in the heat treatment zone 300.

[0108] The working principle of the heat treatment equipment provided in this embodiment is as follows:

[0109] A1, Device docking lock:

[0110] The electric heating device 5 is moved upward by the lifting assembly 4, and the electric heating device 5 docks with and locks to the bottom of the processing tank 3;

[0111] The lifting assembly 4 also controls the platform 71, the third drive component 72 and the fourth bevel gear 73 to move upward as a whole, so that the fourth bevel gear 73 and the third bevel gear 66 are engaged and meshed.

[0112] A2, Heat Treatment:

[0113] The electric heating device 5 is activated, and the electric heating device 5 heats the processing tank 3, so that the material in the processing tank 3 is heated and processed.

[0114] During heat treatment, the third drive unit 72 is activated, which drives the fourth bevel gear 73 to rotate. The fourth bevel gear 73 drives the third bevel gear 66 to rotate. The third bevel gear 66 drives the second bevel gear 65 to rotate via the rotating shaft 64. The second bevel gear 65 drives the first bevel gear 63 to rotate. The first bevel gear 63 drives the stirring rod 62 to rotate inside the processing tank 3, so that the stirring rod 62 stirs and mixes the material in the processing tank 3, making the material heated more evenly.

[0115] A3, Collaborative work;

[0116] At the same time, the first batch of materials can be conveniently injected into the processing tank 3 within the first feeding area 100 through the first feed pipe 121;

[0117] The second batch of material can be conveniently injected into the processing tank 3 within the second feeding area 200 through the second feed pipe 122;

[0118] Open the discharge port 301 of the discharge area 400 to facilitate the discharge of the heat-treated material into the receiving pool 8 for subsequent cooling and filtration of the material;

[0119] A4, with the equipment unlocked and the electric heating device 5 continuously running, the lifting assembly 4 controls the electric heating device 5 and the drive assembly 7 to move downwards as a whole, causing the electric heating device 5 to separate from the bottom of the processing tank 3, and the fourth bevel gear 73 to separate from the third bevel gear 66, providing clearance for workstation switching:

[0120] A5, Workstation Switching:

[0121] Start the first drive unit 23, the first drive unit 23 drives the first gear 24 to rotate, the first gear 24 drives the first gear ring 25 to rotate, the first gear ring 25 drives the rotating cover 21 to rotate stably on the support shaft 111, the rotating cover 21 drives the four processing tanks 3 to rotate counterclockwise through the rotating frame 22.

[0122] This causes the processing tank 3 within the first feeding zone 100 to rotate to the second feeding zone 200;

[0123] The processing tank 3 within the second feeding zone 200 is rotated to the heat treatment zone 300;

[0124] The processing tank 3 within the heat treatment zone 300 is rotated to the discharge zone 400;

[0125] The processing tank 3 within the discharge zone 400 is rotated to the first feed zone 100.

[0126] Please refer to the following: Figure 6 (a) to Figure 6 (b) to Figure 6 (c) to Figure 6 In part (d), during the process of the processing tank 3 rotating from the heat treatment zone 300 to the discharge zone 400, the processing tank 3 drives the slide rod 312 to rotate and slide within the range of the rotating disk 314 until the slide rod 312 abuts against the transmission protrusion 315. The slide rod 312 drives the switch plate 313 to open adaptively, so that after the processing tank 3 rotates to directly above the receiving pool 8, the discharge port 301 will open automatically to discharge the heat-treated material.

[0127] After completing the workstation switch, repeat steps A1 to A5 to achieve cyclic heat treatment of the four processing tanks 3 without frequently switching the electric heating device 5 on and off.

[0128] Second embodiment:

[0129] Please refer to the following: Figure 6 and Figure 7 Based on the heat treatment apparatus provided in the first embodiment of the present invention, the second embodiment of the present invention proposes another heat treatment apparatus. The second embodiment is merely a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0130] Specifically, the heat treatment device provided in the second embodiment of the present invention differs in that the rotating component 2 may not include the first driving member 23, the first gear 24 and the first gear ring 25.

[0131] The rotating frame 22 is fixedly provided with a second gear ring 221, and the bottom of the fourth bevel gear 73 is fixedly provided with a second gear 731, which is aligned vertically with the second gear ring 221.

[0132] When the third drive unit 72 is in the docking mode, the second gear 731 separates from the second gear ring 221;

[0133] When the third driving member 72 is in the avoidance state, the second gear 731 and the second gear ring 221 are engaged vertically.

[0134] In this embodiment, when the electric heating device 5 is in docking mode, the second gear 731 separates from the second gear ring 221, and the third driving member 72 provides power for the rotation of the stirring rod 62;

[0135] When the electric heating device 5 is in the avoidance mode, the second gear 731 meshes with the second gear ring 221, and the third drive unit 72 provides power for the switching of the four processing tanks 3.

[0136] To facilitate continuous operation of the electric heating device 5, the third drive component 72 can not only control the stirring and mixing of materials in the processing tank 3, but also control the switching of the four processing tanks 3.

[0137] The working principle of the heat treatment equipment provided in this embodiment:

[0138] like Figure 9 As shown, it can be defined that in the initial state, the electric heating device 5 is in the docking mode, the fourth bevel gear 73 is engaged with the third bevel gear 66, and the second gear 731 is separated from the second gear ring 221, so that during the process of the electric heating device 5 heating the material in the processing tank 3, the stirring rod 62 is controlled to rotate and adjust by the third driving member 72, and the stirring rod 62 stirs the material in the processing tank 3, so that the material is mixed more evenly when heated;

[0139] See also Figures 9 to 10 After the processing tank 3 has finished heating, while the electric heating device 5 is still running, the lifting assembly 4 controls the electric heating device 5, the platform 71, the third drive component 72, the fourth bevel gear 73 and the second gear 731 to move downward, so that the electric heating device 5 is separated from the processing tank 3, the fourth bevel gear 73 is separated from the third bevel gear 66, and the second gear 731 is engaged with the second gear ring 221.

[0140] The third drive unit 72 is then activated, which drives the fourth bevel gear 73 and the second gear 731 to rotate. When the second gear 731 rotates, it drives the second gear ring 221 to rotate. The second gear ring 221 drives the rotating frame 22, the rotating cover 21 and the processing tank 3 to rotate as a whole, so that the processing tank 3 completes one station switch.

[0141] After the workstation switching is completed, the electric heating device 5, the platform 71, the third drive component 72, the fourth bevel gear 73 and the second gear 731 are moved upward as a whole by the lifting component 4. This allows the electric heating device 5 to be turned off during the equipment cooling process, and it is not necessary to wait for the electric heating device 5 to be completely cooled before discharging. This reduces unnecessary frequent start-ups and shutdowns of the equipment, reduces heat loss, and accelerates the heating efficiency of the next processing tank 3.

[0142] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for the resource-based recycling of fly ash and carbide slag, characterized in that, Includes the following steps: Step S1, fly ash pretreatment: Grind the fly ash using an ultrafine ball mill, sieve it to remove unburned carbon particles, and obtain fine-particle fly ash. Step S2, magnetic separation: fine fly ash particles are separated by a high gradient magnetic separator to obtain magnetic materials and de-ironized fly ash. Step S3, mixing treatment: the calcium carbide slag and de-ironized fly ash used as calcium source are mixed, potassium hydroxide solution is added and heated in a heat treatment device to obtain filtrate A and active calcium silicate powder. Step S4, carbonization treatment: Pour filtrate A into a sealed reaction vessel, introduce carbon dioxide and pressurize to carry out carbonization precipitation, filter, and obtain gallium aluminum coprecipitate and filtrate B; Step S5, causticization treatment: Mix filtrate B and carbide slag, carry out causticization reaction, filter, and obtain regenerated potassium hydroxide solution and residue.

2. The method for resource recycling of fly ash and carbide slag according to claim 1, characterized in that, The particle size of the particles ground in step S1 is ≤10μm.

3. The method for resource recycling of fly ash and carbide slag according to claim 1, characterized in that, The magnetic field strength during magnetic separation in step S2 is 1.2T.

4. The method for resource recycling of fly ash and carbide slag according to claim 1, characterized in that, In step S3, carbide slag and de-ironized fly ash are mixed at a Ca / Si molar ratio of 0.

9.

5. The method for resource recycling of fly ash and carbide slag according to claim 4, characterized in that, In step S3, potassium hydroxide solution is added at a concentration of 10 g / L. The heating reaction is carried out at 180°C for 2 hours, followed by rapid cooling and filtration.

6. The method for resource recycling of fly ash and carbide slag according to claim 1, characterized in that, In step S3, filtrate A is rich in gallium, potassium, and aluminum.

7. The method for resource recycling of fly ash and carbide slag according to claim 1, characterized in that, The active calcium silicate powder is used in the preparation of silicon fertilizer.

8. The method for resource recycling of fly ash and carbide slag according to claim 1, characterized in that, In step S4, the carbonization precipitation temperature is 90℃, the pressure is increased to 1.5MPa, and the reaction time is 1h.

9. The method for resource recycling of fly ash and carbide slag according to claim 1, characterized in that, The gallium-aluminum coprecipitate is further separated and purified for the recovery of gallium and aluminum products.

10. The method for resource recycling of fly ash and carbide slag according to claim 1, characterized in that, The residue from step S5 is reused in the mixture of carbide slag and de-ironized fly ash from step S3.

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