Device and method for recovering valuable metals from furnace slag of aluminum electrolysis cell carbon slag reduction copper furnace

Abstract

The invention provides a device and a method for recovering valuable metals from slag of a copper furnace by reducing carbon slag in an aluminum electrolysis cell, and relates to the technical field of metal material recovery, the device comprises a smelting furnace, a mixing bin, an anti-blocking mechanism and a screening mechanism; the anti-blocking mechanism comprises a rotating ring rotationally connected to the bottom of the mixing bin, a gear disc is fixedly arranged at the bottom of the rotating ring, an arch breaking plate is fixedly arranged on the inner side of the gear disc and located on the inner side of the mixing bin, a mounting seat is fixedly arranged on the right side of the mixing bin, and a driving motor is arranged at the top of the mounting seat. According to the scheme, it is finally achieved that when a gear disc rotates, an adjusting support and a rotating wheel are driven to rotate at the same time, under the action of a protruding plate, a screening frame drives a screen to move up and down, and marbles irregularly jump in a lantern ring, so that discharged materials are screened, the roasted materials do not need to be screened independently, and the screening efficiency is improved. And the efficiency of recovering valuable metals from the copper-aluminum slag is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material recycling, and particularly to a device and method for recycling valuable metals from the slag of a copper furnace for reducing carbon slag in an aluminum electrolysis cell. Background Art

[0002] Copper and aluminum are the two metals with the largest production in the world. Every year, millions of tons of solid waste are generated during the smelting of these two metals. How to treat and effectively recycle these solid wastes is a major problem. The modern aluminum industry uses the cryolite-aluminum oxide molten salt electrolysis method to produce aluminum. Fluorides such as cryolite (Na3AlF6) and aluminum fluoride (AlF3) are added to the electrolysis cell as electrolysis aids and will gradually accumulate on the positive and negative electrodes as the electrolysis progresses. The aluminum electrolysis cell needs to be overhauled every three to five years, so a large amount of electrolysis cell waste slag is generated. The main components of the carbon slag are carbon, fluorides, cyanides, etc. If it is stacked randomly, it will pollute the groundwater and harm the environment, and an effective method for treatment is needed. According to statistics, 2.2 tons of copper slag are generated for every ton of copper produced. The copper converter slag contains components such as chalcocite, Fe2SiO4, Fe3O4, CoO, Cu2S, etc., and has high recycling value.

[0003] In the related art, copper converter slag is a by-product in the copper smelting process, contains recoverable metals and mineral resources, and has high recycling value. However, when the existing copper furnace slag recycling device recovers valuable metals, the material needs to be screened separately after being crushed before it can be roasted. This process takes a long time, resulting in low efficiency of recovering valuable metals from copper furnace slag.

[0004] Therefore, it is necessary to provide a device and method for recycling valuable metals from the slag of a copper furnace for reducing carbon slag in an aluminum electrolysis cell to solve the above technical problems. Summary of the Invention

[0005] The present invention provides a device and method for recycling valuable metals from the slag of a copper furnace for reducing carbon slag in an aluminum electrolysis cell, and solves the technical problem that in the related art, when the existing copper furnace slag recycling device recovers valuable metals, the material needs to be screened in advance, resulting in low efficiency of recovering valuable metals from copper furnace slag.

[0006] To solve the above technical problems, the device for recycling valuable metals from the slag of a copper furnace for reducing carbon slag in an aluminum electrolysis cell provided by the present invention includes: a smelting furnace, a mixing bin, an anti-blocking mechanism, and a screening mechanism;

[0007] The anti-blocking mechanism includes a rotating ring rotatably connected to the bottom of the mixing bin. A gear disc is fixedly provided at the bottom of the rotating ring. An arch-breaking plate is fixedly provided inside the gear disc and inside the mixing bin. An installation seat is fixedly provided on the right side of the mixing bin. A driving motor is arranged on the top of the installation seat. A gear is fixedly provided at the output end of the driving motor. The gear meshes with the gear disc. A protection plate is fixedly provided at the bottom of the installation seat.

[0008] The screening mechanism includes an installation ring fixedly provided on the top of the melting furnace. A plurality of guide rods are fixedly provided on the top of the installation ring. A screening frame is slidably connected to the surfaces of the plurality of guide rods. Springs are sleeved on the surfaces of the plurality of guide rods and at the bottom of the screening frame. Three convex plates are fixedly provided on the top of the screening frame. Three adjusting brackets are threadedly connected inside the gear disc. Rotating wheels are rotatably connected to the inner sides of the bottoms of the three adjusting brackets. A screen is fixedly provided inside the screening frame. A plurality of sleeve rings are arranged inside the screen. Marbles are arranged inside the plurality of sleeve rings. A material guiding plate is fixedly provided inside the screening frame and on the top of the screen.

[0009] Preferably, the bottom of the gear disc is annular and is located inside the top of the screening frame. The screen is of a double-layer structure. The height of the sleeve ring is less than the internal height of the screen.

[0010] Preferably, when the gear disc drives the adjusting bracket and the rotating wheel to rotate, the bottom of the rotating wheel will contact the convex plate, and the screening frame will be pressed downward through the convex plate.

[0011] Preferably, a discharging mechanism is fixedly provided on the top of the screen. The discharging mechanism includes a screw rod fixedly provided on the top of the screen. A connecting frame is sleeved on the surface of the screw rod. Nuts are threadedly connected to the surface of the screw rod and at the top and bottom of the connecting frame. A conical seat is fixedly provided on the peripheral side of the connecting frame.

[0012] Preferably, a mixing mechanism is rotatably connected inside the mixing bin. The mixing mechanism includes a rotating shaft vertically and rotatably connected inside the mixing bin. A dispersion disc is fixedly provided at the top of the rotating shaft. Two brackets are fixedly provided on the surface of the rotating shaft. A mixing frame is fixedly provided on the surfaces of the two brackets. A mixing motor for driving the rotating shaft to rotate is arranged on the top of the mixing bin. Three feed pipes are communicated with the top of the mixing bin. The three feed pipes are distributed in a product shape.

[0013] Preferably, a base is provided at the bottom of the smelting furnace, and a waste heat recovery mechanism is provided on the rear side of the top of the base. The waste heat recovery mechanism includes a recovery box fixedly provided on the rear side of the top of the base, and an air pump is provided on the top of the recovery box. The top of the air pump is connected to an air extraction pipe, the top of the air extraction pipe is connected to the smelting furnace, and the left side of the air extraction pump is connected to an exhaust pipe. A recovery pipe is fixed inside the recovery box, and a serpentine pipe is provided on the surface of the recovery pipe.

[0014] Preferably, a cleaning mechanism is fixedly provided on the left side of the recycling box, and the cleaning mechanism includes a treatment cylinder fixedly provided on the left side of the recycling box, the treatment cylinder is connected to the left side of the recovery pipe, the bottom end of the exhaust pipe is connected to the top of the treatment cylinder, the inner wall of the treatment cylinder is fixedly provided with a filter plate, and the inner wall of the treatment cylinder and the left side of the filter plate are fixedly provided with a mounting bracket, the inner side of the mounting bracket is rotatably connected to a rotating rod, the left end of the rotating rod is fixedly provided with an impeller, and the right end of the rotating rod is fixedly provided with a cleaning rack.

[0015] Preferably, a fixed bracket is fixedly provided on the top of the smelting furnace, the inner side of the fixed bracket is fixedly connected to the surface of the mixing bin, and the top of the smelting furnace is connected to a conical bucket.

[0016] The method for recovering valuable metals by reducing copper furnace slag with aluminum electrolysis cell carbon slag comprises the following steps:

[0017] S1: Grind carbon slag and copper furnace slag thoroughly;

[0018] S2: The ground carbon slag from S1 is mixed with calcium salt and fully roasted. The mixture may be one or more of CaO, Ca(OH)2, CaSO4, and CaCl2. The role of the calcium salt is to fix fluorine. Fluorides such as Na3AlF6, AlF3, and NaF in the carbon slag are roasted to generate CaF2, which reduces the volatilization and dissolution of fluorine in the subsequent roasting process.

[0019] S3: mixing cathode carbon slag roasting material, copper converter slag and a sulfiding agent, wherein the sulfiding agent is composed of chalcopyrite, silicon dioxide, aluminum oxide, calcium oxide or more;

[0020] S4: crushing the copper matte / alloy obtained in S3 into 100-200 mesh;

[0021] S5: Magnetic separation, the copper matte / alloy powder ground in S4 is magnetically separated to separate the Co-Fe alloy. Since the Co-Fe alloy is magnetic, it can be easily separated from the matte phase by magnetic separation. Copper mainly exists in the form of sulfide in the magnetic separation slag;

[0022] S6: Flotation is used to recover copper concentrate. The collector is commercial sodium butyl xanthate and the frother is commercial terpineol. Copper concentrate and tailings are collected and the concentrate can be recycled back into copper smelting.

[0023] Preferably, the ratio of carbon slag to calcium salt is 1-3:1, the roasting time is 0.5-3 h, the roasting temperature is 300 °C-500 °C, and after roasting, it is ground and sieved through at least 100 meshes to obtain the roasted carbon slag material;

[0024] After the roasted cathode carbon slag material, copper converter slag and sulfurizing agent are mixed, the roasting temperature during the roasting process is 1300 °C-1500 °C, and in this process, most of the Cu2O is sulfided by the sulfurizing agent to form matte phases of mCu2S-nFeS and mCoS-nFeS.

[0025] Compared with the related technologies, the device and method for recovering valuable metals from the copper slag of the carbon slag reduction copper furnace of the aluminum electrolytic cell provided by the present invention have the following beneficial effects:

[0026] When feeding and roasting the ground materials, the ground and mixed materials are put into the mixing bin. By driving the motor to rotate, the gear drives the gear disc and the arch-breaking plate to rotate, mixing the fine materials in the mixing bin to prevent arching when the materials are fed. Moreover, when the gear disc rotates, it will drive the adjusting bracket and the rotating wheel to rotate at the same time. Under the action of the convex plate, the screening frame drives the screen to move up and down, and the marbles jump randomly in the collar, so as to screen the fed materials. There is no need to spend separate time screening the roasting materials, which improves the efficiency of recovering valuable metals from copper-aluminum slag. And the particle size of the screened materials is relatively uniform, which can improve the effect of recovering valuable metals from copper-aluminum slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 It is the best structural schematic diagram provided by the present invention;

[0029] Figure 2 It is the structural schematic diagram of the rear view provided by the present invention;

[0030] Figure 3 It is the structural schematic diagram of the anti-blocking mechanism provided by the present invention;

[0031] Figure 4 is Figure 3 The state schematic diagram showing the gear rotation driving the gear disc and the arch-breaking plate to rotate clockwise as shown;

[0032] Figure 5Structural schematic diagram of the screening mechanism provided by the present invention;

[0033] Figure 6 is Figure 5 Structural schematic diagram of the cross-sectional view of the screening box shown;

[0034] Figure 7 is Figure 5 Schematic diagram of the state where the gear disk drives the adjusting bracket and the rotating wheel to rotate clockwise, causing the screening box to slide downward on the surface of the guide rod;

[0035] Figure 8 is Figure 1 Structural schematic diagram of the cross-sectional view of the mixing bin shown;

[0036] Figure 9 Structural schematic diagram of the discharging mechanism provided by the present invention;

[0037] Figure 10 Structural schematic diagram of the mixing mechanism provided by the present invention;

[0038] Figure 11 Structural schematic diagram of the waste heat recovery mechanism provided by the present invention;

[0039] Figure 12 Structural schematic diagram of the cleaning mechanism provided by the present invention;

[0040] Figure 13 Step diagram of recovering valuable metals from copper furnace slag provided by the present invention.

[0041] Explanation of the reference numerals in the drawings:

[0042] 1. Melting furnace; 2. Mixing bin;

[0043] 3. Anti-blocking mechanism; 31. Rotating ring; 32. Gear disk; 33. Arch-breaking plate; 34. Mounting seat; 35. Driving motor; 36. Gear; 37. Protective plate;

[0044] 4. Screening mechanism; 41. Mounting ring; 42. Guide rod; 43. Screening box; 44. Spring; 45. Convex plate; 46. Adjusting bracket; 47. Rotating wheel; 48. Screen; 49. Collar; 410. Ball; 411. Guide plate;

[0045] 5. Discharging mechanism; 51. Screw; 52. Connecting frame; 53. Nut; 54. Conical seat;

[0046] 6. Mixing mechanism; 61. Rotating shaft; 62. Dispersion disk; 63. Bracket; 64. Mixing frame; 65. Mixing motor;

[0047] 7. Feed pipe; 8. Base;

[0048] 9. Waste heat recovery mechanism; 91. Recovery box; 92. Air extraction pump; 93. Air extraction pipe; 94. Exhaust pipe; 95. Recovery pipe; 96. Serpentine pipe;

[0049] 10. Cleaning mechanism; 101. Processing cylinder; 102. Filter plate; 103. Installation bracket; 104. Rotating rod; 105. Impeller; 106. Cleaning frame;

[0050] 11. Fixed bracket; 12. Conical hopper.

[0051] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0053] The present invention provides a device and method for recovering valuable metals from the slag of a copper furnace for reducing carbon slag in an aluminum electrolytic cell.

[0054] First embodiment:

[0055] Please refer to Figures 1 to 7 , a device for recovering valuable metals from the slag of a copper furnace for reducing carbon slag in an aluminum electrolytic cell, comprising: a smelting furnace 1, a mixing bin 2, an anti-blocking mechanism 3 and a screening mechanism 4;

[0056] The anti-blocking mechanism 3 includes a rotating ring 31 rotatably connected to the bottom of the mixing bin 2. A gear disk 32 is fixedly provided at the bottom of the rotating ring 31. An arch-breaking plate 33 is fixedly provided inside the gear disk 32 and inside the mixing bin 2. An installation seat 34 is fixedly provided on the right side of the mixing bin 2. A driving motor 35 is provided on the top of the installation seat 34. A gear 36 is fixedly provided at the output end of the driving motor 35. The gear 36 meshes with the gear disk 32. A protective plate 37 is fixedly provided at the bottom of the installation seat 34;

[0057] Please combine Figure 3 and Figure 4 : Start the driving motor 35. The driving motor 35 rotates to drive the gear 36 to rotate. The gear 36 rotates to drive the gear disk 32 to rotate, so that the rotating ring 31 rotates at the bottom of the mixing bin 2. The rotation of the gear disk 32 drives the arch-breaking plate 33 to rotate, thereby mixing the materials in the mixing bin 2 and preventing the materials from arching;

[0058] The screening mechanism 4 includes a mounting ring 41 fixed to the top of the smelting furnace 1. A plurality of guide rods 42 are fixed to the top of the mounting ring 41. A screening frame 43 is slidably connected to the surfaces of the plurality of guide rods 42. Springs 44 are sleeved on the surfaces of the plurality of guide rods 42 and located at the bottom of the screening frame 43. Three convex plates 45 are fixed to the top of the screening frame 43. Three adjusting brackets 46 are threadedly connected to the inner side of the gear disk 32. Rotating wheels 47 are rotatably connected to the inner sides of the bottoms of the three adjusting brackets 46. A sieve mesh 48 is fixed to the inner side of the screening frame 43. A plurality of collar rings 49 are arranged inside the sieve mesh 48. Marbles 410 are arranged inside the plurality of collar rings 49. A material guiding plate 411 is fixed to the inner side of the screening frame 43 and located above the sieve mesh 48.

[0059] Please combine Figure 7 : When the gear disk 32 rotates, it will drive the three adjusting brackets 46 and the rotating wheels 47 to rotate simultaneously. When the rotating wheel 47 contacts the convex plate 45 during rotation, it will press the screening frame 43 downward through the convex plate 45, causing the screening frame 43 to slide downward on the surface of the guide rod 42 and making the spring 44 contract. When the rotating wheel 47 continues to rotate and disengages from the convex plate 45, the screening frame 43 will be driven to slide suddenly upward on the surface of the guide rod 42 by the expansion of the spring 44. At this time, if there is material on the top of the sieve mesh 48, by driving the sieve mesh 48 to move suddenly upward through the screening frame 43, the sieve mesh 48 can be used to screen the material, so that the material with an inappropriate mesh size stays on the top of the sieve mesh 48. Moreover, when the sieve mesh 48 moves suddenly upward, the marbles 410 in the collar rings 49 will jump irregularly, so that the screening effect of the sieve mesh 48 on the material can be improved by hitting the sieve mesh 48, and to a certain extent, the blockage of the sieve mesh 48 by the material can be avoided.

[0060] The bottom of the gear disk 32 is circular and located inside the inner side of the top of the screening frame 43. The sieve mesh 48 is of a double-layer structure. The height of the collar ring 49 is less than the internal height of the sieve mesh 48.

[0061] When the gear disk 32 drives the adjusting brackets 46 and the rotating wheels 47 to rotate, the bottom of the rotating wheel 47 will contact the convex plate 45 and press the screening frame 43 downward through the convex plate 45.

[0062] In this embodiment, different from the existing smelting furnace structure, when the device feeds and roasts the ground materials, the ground and mixed materials are put into the mixing bin 2. By rotating the driving motor 35, the gear 36 is used to drive the gear disk 32 and the arch-breaking plate 33 to rotate, so as to mix the fine materials in the mixing bin 2 and avoid arching when the materials are fed. Moreover, when the gear disk 32 rotates, it will drive the adjusting bracket 46 and the rotating wheel 47 to rotate at the same time. Under the action of the convex plate 45, the screening frame 43 drives the screen 48 to move up and down, and the marbles 410 jump randomly in the collar 49, so as to screen the fed materials. There is no need to spend separate time screening the roasted materials, which improves the efficiency of recovering valuable metals from copper-aluminum slag, and the particle size of the screened materials is relatively uniform, which can improve the effect of recovering valuable metals from copper-aluminum slag.

[0063] Second Embodiment:

[0064] Please refer to Figures 8 to 10 , a discharging mechanism 5 is fixedly arranged on the top of the screen 48. The discharging mechanism 5 includes a screw rod 51 fixedly arranged on the top of the screen 48. A connecting frame 52 is sleeved on the surface of the screw rod 51. Nuts 53 are threadedly connected to the surface of the screw rod 51 at the top and bottom of the connecting frame 52. A conical seat 54 is fixedly arranged on the peripheral side of the connecting frame 52;

[0065] Please combine Figure 8 and Figure 9 : When the screening frame 43 drives the screen 48 to move downward, the screen 48 will drive the connecting frame 52 and the conical seat 54 to move downward through the screw rod 51, so that the bottom of the conical seat 54 is separated from the bottom of the mixing bin 2, and then the mixing bin 2 is actively opened, so that the materials can uniformly fall onto the screen 48 through the surface of the top of the conical seat 54. When the screening frame 43 drives the screen 48 to move upward, the screen 48 will drive the connecting frame 52 and the conical seat 54 to move upward at the same time, so as to seal the bottom of the mixing bin 2. By driving the screen 48 to move up and down through the screening frame 43, the conical seat 54 is driven to intermittently discharge the materials in the mixing bin 2, which is convenient for the furnace temperature in the smelting furnace 1 to quickly recover to the target temperature after feeding, avoiding the adverse effects brought by thermal shock, and can avoid local overheating in the furnace or the occurrence of unreacted areas caused by material accumulation;

[0066] Furthermore, by adjusting the positions of the two nuts 53, the height of the connecting frame 52 and the conical seat 54 on the screw rod 51 can be adjusted. By controlling the height of the conical seat 54, the amount of each material discharge can be controlled.

[0067] A mixing mechanism 6 is rotatably connected to the inner side of the mixing bin 2. The mixing mechanism 6 includes a rotating shaft 61 vertically and rotatably connected to the inner side of the mixing bin 2. A dispersion disc 62 is fixedly provided at the top of the rotating shaft 61. Two brackets 63 are fixedly provided on the surface of the rotating shaft 61. A mixing frame 64 is fixedly provided on the surfaces of the two brackets 63. A mixing motor 65 for driving the rotation of the rotating shaft 61 is provided at the top of the mixing bin 2. Three feed pipes 7 are communicated with the top of the mixing bin 2, and the three feed pipes 7 are distributed in a product shape;

[0068] Please refer to Figure 10 : When materials are put into the mixing bin 2 through multiple feed pipes 7 according to a certain ratio, start the mixing motor 65. The mixing motor 65 rotates to drive the rotating shaft 61 to rotate. The rotating shaft 61 rotates to drive the dispersion disc 62 to rotate. When various materials contact the dispersion disc 62, through the centrifugal force generated when the dispersion disc 62 rotates, various materials are scattered in the mixing bin 2, so that various materials are mixed in the air. When the rotating shaft 61 rotates, it will drive the mixing frame 64 to rotate through the brackets 63 at the same time, so as to use the mixing frame 64 to perform secondary mixing on the materials and ensure the uniformity of the mixed materials.

[0069] In this embodiment, when the gear disc 32 rotates to drive the screening frame 43 and the screen 48 to move up and down, the screen 48 will drive the connecting frame 52 and the conical seat 54 to move up and down at the same time. Furthermore, the conical seat 54 is used to intermittently feed the materials in the mixing bin 2, which is convenient for the furnace temperature in the melting furnace 1 to quickly recover to the target temperature after feeding, avoiding the adverse effects brought by thermal shock, and can avoid local overheating in the furnace or the occurrence of unreacted areas caused by material accumulation. By driving the dispersion disc 62 and the mixing frame 64 to rotate through the rotating shaft 61, multiple mixing of various materials is carried out, thereby improving the uniformity of the mixed materials.

[0070] Third embodiment:

[0071] Please refer to Figure 11 and Figure 12 A base 8 is provided at the bottom of the melting furnace 1. A waste heat recovery mechanism 9 is provided at the rear side of the top of the base 8. The waste heat recovery mechanism 9 includes a recovery box 91 fixedly provided at the rear side of the top of the base 8. An air extraction pump 92 is provided at the top of the recovery box 91. An air extraction pipe 93 is communicated with the top of the air extraction pump 92. The top end of the air extraction pipe 93 is communicated with the melting furnace 1. An exhaust pipe 94 is communicated with the left side of the air extraction pump 92. A recovery pipe 95 is fixedly provided inside the recovery box 91. A serpentine pipe 96 is provided on the surface of the recovery pipe 95;

[0072] Please refer to Figure 11: Start the air extraction pump 92. The air extraction pump 92 extracts the high-temperature gas in the smelting furnace 1 through the air extraction pipe 93, and pumps the high-temperature gas into the recovery pipe 95 through the exhaust pipe 94. The high-temperature gas is used to heat the serpentine pipe 96, thereby generating hot water with a certain temperature, and then recovering the waste heat of the smelting furnace 1.

[0073] A cleaning mechanism 10 is fixedly installed on the left side of the recovery box 91. The cleaning mechanism 10 includes a processing cylinder 101 fixedly installed on the left side of the recovery box 91. The processing cylinder 101 is communicated with the left side of the recovery pipe 95. The bottom end of the exhaust pipe 94 is communicated with the top of the processing cylinder 101. A filter plate 102 is fixedly installed on the inner wall of the processing cylinder 101. An installation bracket 103 is fixedly installed on the inner wall of the processing cylinder 101 and on the left side of the filter plate 102. A rotating rod 104 is rotatably connected to the inner side of the installation bracket 103. An impeller 105 is fixedly installed at the left end of the rotating rod 104. A cleaning frame 106 is fixedly installed at the right end of the rotating rod 104;

[0074] Please refer to Figure 12 : When extracting the high-temperature gas in the smelting furnace 1 through the air extraction pump 92 and the exhaust pipe 94, the gas will enter the recovery pipe 95 through the processing cylinder 101. The filter plate 102 can filter the particles in the gas. When the gas enters the processing cylinder 101, it will drive the impeller 105 to rotate. The rotation of the impeller 105 drives the cleaning frame 106 to rotate through the rotating rod 104, thereby cleaning the filter plate 102 by the rotation of the cleaning frame 106 and preventing the surface of the filter plate 102 from being blocked by the particles contained in the gas.

[0075] A fixed bracket 11 is fixedly installed on the top of the smelting furnace 1. The inner side of the fixed bracket 11 is fixedly connected to the surface of the mixing bin 2. A conical hopper 12 is communicated with the top of the smelting furnace 1.

[0076] In this embodiment, the air extraction pump 92 extracts the high-temperature gas in the smelting furnace 1 through the air extraction pipe 93, and pumps the high-temperature gas into the recovery pipe 95 through the exhaust pipe 94. The serpentine pipe 96 is used to recover the waste heat of the high-temperature gas. When the gas passes through the processing cylinder 101, it will drive the impeller 105 to rotate. The rotation of the impeller 105 drives the cleaning frame 106 to rotate through the rotating rod 104, thereby cleaning the filter plate 102 by the rotation of the cleaning frame 106 and preventing the surface of the filter plate 102 from being blocked by the particles contained in the gas.

[0077] Fourth Embodiment:

[0078] Please refer to Figure 13 , A method for recovering valuable metals from the slag of the carbon slag reduction copper furnace of an aluminum electrolytic cell, including the following steps:

[0079] S1: Grind the carbon slag and the copper furnace slag thoroughly;

[0080] S2: Mix the ground carbon slag from S1 with calcium salts and roast them thoroughly. The calcium salts can be CaO, Ca(OH)2, CaSO4, CaCl2, or multiple of them. The function of the calcium salts is to fix fluorine. Roast the fluorides such as Na3AlF6, AlF3, and NaF in the carbon slag to form CaF2, reducing the volatilization and dissolution of fluorine in the subsequent roasting process.

[0081] S3: Mix the roasted cathode carbon slag, copper converter slag, and sulfiding agent. The sulfiding agent consists of chalcopyrite, silicon dioxide, alumina, calcium oxide, or multiple of them.

[0082] S4: Crush. Crush the copper matte / alloy obtained in S3 to 100 mesh - 200 mesh.

[0083] S5: Magnetic separation. Magnetically separate the Co - Fe alloy from the ground copper matte / alloy powder in S4. Since the Co - Fe alloy has magnetism, it can be easily separated from the matte phase by magnetic separation. Copper mainly exists in the magnetic separation slag in the form of sulfide.

[0084] S6: Flotation to recover copper concentrate. The collector is commercial sodium butyl xanthate, and the frother is commercial terpineol. Collect the copper concentrate and tailings. The concentrate can be remelted for copper smelting.

[0085] Please combine with Figure 13 : The following are the main components and contents of the carbon slag and copper converter slag used in the following schemes:

[0086] Converter slag composition Fe2SiO4 Fe3O4 Cu2S CoO Al2O3 CaO MgO SiO2 Content wt% 44.2 28.1 2.34 4.61 1.27 0.11 0.15 6.94

[0087] Carbon slag composition C NaF SiO2 AlF3 Fe2O3 CaF2 CN- Content wt% 70.4 18.1 2.68 7.57 0.73 0.98 0.002

[0088] In the schemes used in this method, the carbon slag, converter slag, and roasted carbon slag are all ground to at least 100 mesh using a vibratory mill.

[0089] Scheme 1: The carbon slag used in this scheme is cathode carbon slag. Mix 40 g of cathode carbon slag with 20 g of calcium oxide thoroughly and put them into a muffle furnace for roasting at 300 °C for 1 h to obtain 54.2 g of roasted cathode carbon slag. Mix 54.2 g of the roasted cathode carbon slag with 100 g of copper converter slag and 40 g of chalcopyrite thoroughly and transfer them to a muffle furnace. Heat up to 1300 °C and roast for 2 hours. The main reactions in the examples are:

[0090] Fe3O4(l)+C(s)→3FeO(l)+CO(g)

[0091] FeO(l)+C(s)→Fe+CO(g)

[0092] CoO(l)+C(s)→Co+CO(g)

[0093] CuO(l)+C(s)→2Cu+CO(g)

[0094] CoO(l)+FeS→CoS+FeO(l)

[0095] After roasting, the mixed roasted material was ground and separated using a magnetic separation device. The Co-Fe alloy in the roasted material was separated. The magnetic separation residue was crushed and ground, then placed in a flotation machine. Commercial sodium butyl xanthate collector and commercial terpineol were used as a frother and stirred for 3 minutes. The scraped scum and residual sediment were manually collected and dried to collect copper concentrate. The copper recovery rate in this scheme was 81.50%, and the copper content in the tailings was only 0.18wt%.

[0096] Scheme 2: The carbon slag used in this scheme is the same as that in Scheme 1. 40 g of carbon slag, 20 g of calcium oxide, copper converter slag, and 40 g of chalcopyrite are mixed evenly and then placed in a muffle furnace for roasting at 1300°C for 2 hours. After roasting, the mixture is ground and the Co-Fe alloy is magnetically separated. The magnetic separation slag is placed in a flotation machine and stirred for 3 minutes using commercial sodium butyl xanthate collector and commercial terpineol as a frother. The scraped slag and residual sediment are manually collected and the slag is dried to collect copper concentrate. The copper recovery rate in this scheme is 85.20%, and the copper content in the tailings is 0.32 wt%;

[0097] Scheme 3: 40 g of cathode carbon slag and 20 g of calcium oxide were thoroughly mixed and placed in a muffle furnace for roasting at 300°C for 1 hour. The mixture was then mixed with 100 g of copper converter slag and 30 g of chalcopyrite, placed in a crucible, and roasted in a muffle furnace at 1500°C for 2 hours. After roasting, the mixture was ground and the Co-Fe alloy was magnetically separated. The magnetic separation slag was placed in a flotation machine and stirred for 3 minutes using commercial sodium butyl xanthate collector and commercial terpineol as a foaming agent. The scraped slag and residual sediment were manually collected and the copper concentrate was collected after the slag was dried. The copper recovery rate in this scheme was 80.40%.

[0098] The ratio of carbon slag to calcium salt is 1-3:1, the roasting time is 0.5-3 hours, the roasting temperature is 300°C-500°C, and after the roasting is completed, the carbon slag roasting material is obtained by grinding and sieving at least 100 meshes;

[0099] After the cathode carbon slag roasting material, copper converter slag and sulfiding agent are mixed, the roasting temperature of the roasting process is 1300℃-1500℃. In this process, most of the Cu2O is sulfided by the sulfiding agent to form matte phases of mCu2S-nFeS and mCoS-nFeS.

[0100] In this embodiment, different from the existing methods for recovering valuable metals from copper converter slag, this method uses fluorine-containing carbon slag from aluminum electrolytic cells as a reducing agent in copper converter slag, which not only realizes the efficient utilization of copper converter slag and carbon slag from aluminum electrolytic cells, reduces the economic cost, but also the fixed fluoride in the aluminum electrolytic cell can reduce the viscosity of the slag, improve the fluidity of the slag, promote the separation of metal, matte and molten slag. And chalcopyrite is used as the main sulfiding agent, which not only provides sulfur as a sulfiding reactant for the slag, but also the iron in chalcopyrite and cobalt in the slag are calcined and reduced to CoFe alloy, which is beneficial to subsequent magnetic separation.

[0101] Please refer to again Figures 1 to 13 , the working principle of the device and method for recovering valuable metals from copper furnace slag by reducing carbon slag of aluminum electrolytic cells provided by the present invention is as follows:

[0102] Step S1, the carbon slag and copper furnace slag are fully ground to below 100 mesh, and then successively fed into the mixing bin 2 through the feed pipe 7 according to a certain ratio, and the mixing motor 65 is started. The mixing motor 65 rotates to drive the rotating shaft 61 to rotate, and the rotating shaft 61 rotates to drive the dispersion disk 62 to rotate. When the material contacts the dispersion disk 62, through the centrifugal force generated when the dispersion disk 62 rotates, the material is scattered in the mixing bin 2, so that the material is mixed in the air. When the rotating shaft 61 rotates, it will simultaneously drive the mixing frame 64 to rotate through the bracket 63, so as to use the mixing frame 64 to perform secondary mixing on the material;

[0103] Step S2, when the materials are fully mixed, the driving motor 35 is started. The driving motor 35 rotates to drive the gear 36 to rotate, and the gear 36 rotates to drive the gear disk 32 to rotate. The gear disk 32 rotates to drive the arch-breaking plate 33 to rotate;

[0104] When the gear disk 32 rotates, it will simultaneously drive three adjusting brackets 46 and rotating wheels 47 to rotate. When the rotating wheel 47 contacts the convex plate 45 during rotation, it will press the screening frame 43 downward through the convex plate 45, so that the screening frame 43 slides downward on the surface of the guide rod 42. The downward movement of the screening frame 43 drives the screen 48 to move downward, and the screen 48 drives the connecting frame 52 and the conical seat 54 to move downward through the screw 51, so that the bottom of the conical seat 54 is separated from the bottom of the mixing bin 2, and then the mixing bin 2 is actively opened (at this time, the arch-breaking plate 33 is in a rotating state, mixing the materials in the mixing bin 2 and preventing the materials from arching, facilitating the smooth falling of the materials), so that the materials uniformly fall onto the screen 48 through the surface of the top of the conical seat 54;

[0105] When the rotating wheel 47 continues to rotate and disengages from the convex plate 45, the expansion of the spring 44 drives the screening box 43 to slide suddenly upward on the surface of the guide rod 42. At this time, the screening box 43 drives the screen 48 to move suddenly upward, and the screen 48 is used to screen the materials, so that the materials with inappropriate mesh sizes stay on the top of the screen 48. Moreover, when the screen 48 moves suddenly upward, the marbles 410 in the collar 49 will jump irregularly, and the screening effect of the screen 48 on the materials can be improved by hitting the screen 48. When the screening box 43 drives the screen 48 to move upward, the screen 48 will simultaneously drive the connecting frame 52 and the conical seat 54 to move upward, thereby sealing the bottom of the mixing bin 2. By driving the screen 48 to move up and down through the screening box 43, the conical seat 54 is driven to intermittently discharge the materials in the mixing bin 2;

[0106] Step S3, after the feeding is completed, the materials are roasted by the smelting furnace 1. The roasting time is 0.5 - 3 h, and the roasting temperature is 300°C - 500°C. After roasting, the materials are ground to at least 100 meshes to obtain the carbon slag roasting material. When the smelting furnace 1 roasts the materials, the air extraction pump 92 is started. The air extraction pump 92 extracts the high-temperature gas in the smelting furnace 1 through the air extraction pipe 93, and the high-temperature gas is pumped into the recovery pipe 95 through the exhaust pipe 94. The serpentine pipe 96 is used to recover the waste heat of the high-temperature gas. When the gas passes through the treatment cylinder 101, it will drive the impeller 105 to rotate. The rotation of the impeller 105 drives the cleaning frame 106 to rotate through the rotating rod 104, and the cleaning frame 106 is used to clean the filter plate 102;

[0107] Step S4, in combination with Steps S1 - S3, the cathode carbon slag roasting material, the copper converter slag and the sulfiding agent are put into the mixing bin 2 through the feeding pipe 7, and then the smelting furnace 1 is used to roast the mixed materials. The roasting temperature during the roasting process is 1300°C - 1500°C;

[0108] Step S5, the copper matte / alloy obtained in Step S4 is crushed and pulverized to 100 - 200 meshes, and the Co - Fe alloy is magnetically separated from the ground copper matte / alloy powder. Since the Co - Fe alloy has magnetism, it can be easily separated from the matte phase by magnetic separation. Copper mainly exists in the magnetic separation slag in the form of sulfide;

[0109] Step S6, floatation is used to recover copper concentrate. The collector is commercially available sodium butyl xanthate, and the foaming agent is commercially available terpineol. Copper concentrate and tailings are collected, and the concentrate can be remelted for copper smelting.

[0110] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. Device for recovering valuable metals from the slag of a copper furnace for reducing carbon slag in an aluminum electrolytic cell, characterized in that, Including: A smelting furnace, a mixing bin, an anti-blocking mechanism, and a screening mechanism; The anti-blocking mechanism includes a rotating ring rotatably connected to the bottom of the mixing bin. A gear disk is fixedly provided at the bottom of the rotating ring. A arch-breaking plate is fixedly provided inside the gear disk and inside the mixing bin. An installation seat is fixedly provided on the right side of the mixing bin. A driving motor is arranged on the top of the installation seat. A gear is fixedly provided at the output end of the driving motor. The gear meshes with the gear disk. A protection plate is fixedly provided at the bottom of the installation seat; The screening mechanism includes an installation ring fixedly provided on the top of the smelting furnace. A plurality of guide rods are fixedly provided on the top of the installation ring. A screening frame is slidably connected to the surfaces of the plurality of guide rods. Springs are sleeved on the surfaces of the plurality of guide rods and at the bottom of the screening frame. Three convex plates are fixedly provided on the top of the screening frame. Three adjusting brackets are threadedly connected inside the gear disk. Rotating wheels are rotatably connected to the inner sides of the bottoms of the three adjusting brackets. A sieve mesh is fixedly provided inside the screening frame. A plurality of sleeve rings are arranged inside the sieve mesh. Marbles are arranged inside the plurality of sleeve rings. A material guiding disk is fixedly provided on the top of the sieve mesh and inside the screening frame.

2. The device for recovering valuable metals from the slag of the copper furnace for reducing carbon slag in an aluminum electrolytic cell according to claim 1, characterized in that, The bottom of the gear disk is annular and is located inside the top of the screening frame. The sieve mesh is of a double-layer structure. The height of the sleeve ring is less than the internal height of the sieve mesh.

3. The device for recovering valuable metals from the slag of the copper furnace for reducing carbon slag in an aluminum electrolytic cell according to claim 1, characterized in that, When the gear disk drives the adjusting bracket and the rotating wheel to rotate, the bottom of the rotating wheel will contact the convex plate, and the screening frame will be pressed downward through the convex plate.

4. The device for recovering valuable metals from the slag of the carbon slag reduction copper furnace of an aluminum electrolytic cell according to claim 1, characterized in that, A discharging mechanism is fixedly provided on the top of the sieve mesh. The discharging mechanism includes a screw rod fixedly provided on the top of the sieve mesh. A connecting frame is sleeved on the surface of the screw rod. Nuts are threadedly connected to the surface of the screw rod and at the top and bottom of the connecting frame. A conical seat is fixedly provided on the circumferential side of the connecting frame.

5. The device for recovering valuable metals from the slag of the copper furnace for reducing carbon slag in an aluminum electrolytic cell according to claim 1, characterized in that, A mixing mechanism is rotatably connected inside the mixing bin. The mixing mechanism includes a rotating shaft vertically and rotatably connected inside the mixing bin. A dispersion disk is fixedly provided at the top of the rotating shaft. Two brackets are fixedly provided on the surface of the rotating shaft. Mixing frames are fixedly provided on the surfaces of the two brackets. A mixing motor for driving the rotating shaft to rotate is arranged on the top of the mixing bin. Three feed pipes are communicated with the top of the mixing bin. The three feed pipes are distributed in a product shape.

6. The device for recovering valuable metals from the slag of a copper furnace for reducing carbon slag in an aluminum electrolytic cell according to claim 1, characterized in that, A base is provided at the bottom of the smelting furnace. A waste heat recovery mechanism is arranged at the rear side of the top of the base. The waste heat recovery mechanism includes a recovery box fixedly provided at the rear side of the top of the base. An air extraction pump is arranged on the top of the recovery box. An air extraction pipe is communicated with the top of the air extraction pump. The top end of the air extraction pipe is communicated with the smelting furnace. An exhaust pipe is communicated with the left side of the air extraction pump. A recovery pipe is fixedly provided inside the recovery box. A serpentine pipe is arranged on the surface of the recovery pipe.

7. The device for recovering valuable metals from the slag of the copper furnace for reducing carbon slag in an aluminum electrolytic cell according to claim 6, characterized in that, A cleaning mechanism is fixedly installed on the left side of the recycling bin. The cleaning mechanism includes a processing cylinder fixedly installed on the left side of the recycling bin. The processing cylinder is communicated with the left side of the recycling pipe. The bottom end of the exhaust pipe is communicated with the top of the processing cylinder. A filter plate is fixedly installed on the inner wall of the processing cylinder. An installation bracket is fixedly installed on the inner wall of the processing cylinder and on the left side of the filter plate. A rotating rod is rotatably connected to the inner side of the installation bracket. An impeller is fixedly installed at the left end of the rotating rod. A cleaning frame is fixedly installed at the right end of the rotating rod.

8. The device for recovering valuable metals from the slag of the copper furnace for reducing carbon slag in an aluminum electrolytic cell according to claim 1, characterized in that, A fixed bracket is fixedly installed on the top of the smelting furnace. The inner side of the fixed bracket is fixedly connected to the surface of the mixing bin. A conical hopper is communicated with the top of the smelting furnace.

9. Method for recovering valuable metals from slag of copper furnace for reducing carbon slag in aluminum electrolytic cell, characterized in that, The method for recycling valuable metals is used for the device for recycling valuable metals as described in any one of claims 1-8, and includes the following steps: S1: Grind the carbon slag and copper furnace slag sufficiently. S2: Mix the ground carbon slag obtained in S1 with a calcium salt and roast it sufficiently. The calcium salt can be CaO, Ca(OH)2, CaSO4, CaCl2 or a combination of them. The function of the calcium salt is to fix fluorine, and roast the fluorides such as Na3AlF6, AlF3, NaF in the carbon slag to generate CaF2 to reduce the volatilization and dissolution of fluorine in the subsequent roasting process. S3: Mix the roasted cathode carbon slag, copper converter slag and a sulfurizing agent. The sulfurizing agent is composed of chalcopyrite, silicon dioxide, alumina, calcium oxide or a combination of them. S4: Crush. Crush the copper matte / alloy obtained in S3 to 100 mesh - 200 mesh. S5: Magnetic separation. Magnetically separate the Co-Fe alloy from the ground copper matte / alloy powder obtained in S4. Since the Co-Fe alloy has magnetism, it can be easily separated from the matte phase by magnetic separation. Copper mainly exists in the magnetic separation slag in the form of sulfide. S6: Flotation to recover copper concentrate. The collector is commercially available sodium butyl xanthate, and the foaming agent is commercially available terpineol. Collect the copper concentrate and tailings. The concentrate can be remelted for copper smelting.

10. The method for recovering valuable metals from the slag of the copper furnace for reducing carbon slag in an aluminum electrolytic cell according to claim 9, characterized in that, The ratio of carbon slag to calcium salt is 1-3:1, the roasting time is 0.5-3h, the roasting temperature is 300°C - 500°C. After roasting, grind and screen to at least 100 mesh to obtain the roasted carbon slag material. After the roasted cathode carbon slag, copper converter slag and sulfurizing agent are mixed, the roasting temperature during the roasting process is 1300°C - 1500°C. In this process, most of the Cu2O is sulfided by the sulfurizing agent to form a matte phase of mCu2S-nFeS and mCoS-nFeS.

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