Novel wet purification device for removing fluoride from electrolytic aluminum flue gas

Abstract

The utility model relates to the technical field of metallurgy, and discloses a novel electrolytic aluminum flue gas fluoride removal wet purification device which comprises a mounting frame, a first reaction cylinder is fixedly mounted on the left side of the top of the mounting frame, a flow dividing pipe is fixedly mounted at the lower end of the right side wall surface of the first reaction cylinder, and a flue gas pipe is fixedly mounted at the middle end of the bottom of the flow dividing pipe; a second reaction cylinder is fixedly mounted on the right side wall surface of the flow dividing pipe, and a first rapid reaction stirring mechanism and a second rapid reaction stirring mechanism are arranged, so that a first pinion and a second pinion drive a first stirring rod and a second stirring rod to revolve while rotating through a first mounting frame and a second mounting frame respectively; therefore, solutions in the first reaction cylinder and the second reaction cylinder are stirred, the chemical reaction efficiency is improved, the chemical reaction effect of the whole device is improved, the requirement for removing fluorine from the electrolytic aluminum flue gas is met, meanwhile, generated compounds can be recycled, and continuous operation can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a novel wet purification device for removing fluoride from electrolytic aluminum fume. Background Art

[0002] During the aluminum electrolysis process, the carbon anode and alumina react electrochemically in the cryolite melt, producing a certain amount of SO2, CO2 and flue gas containing fluorine and Al2O3 dust. The flue gas is collected by the gas hood on the upper part of the aluminum electrolytic cell and then purified by the exhaust system and device and discharged from the chimney. This kind of aluminum electrolysis flue gas is usually called primary flue gas or organized flue gas. At present, my country mainly uses dry purification to remove fluoride from organized emissions of aluminum electrolysis, but no relevant purification and recovery measures have been taken for SO2 and CO2 in the flue gas. With the increasing use of high-sulfur petroleum coke in the production of prebaked anodes, the SO2 concentration in the flue gas discharged by aluminum electrolysis in some enterprises has reached 200-600 mg / Nm3, exceeding the limit of the new environmental protection standard. The new "Aluminum Industry Pollutant Emission Standard" (GB25465-2010) stipulates that the emission limit of fluoride in the aluminum electrolysis industry in some regions is 3 mg / Nm3, and SO2 is 100 mg / Nm3.

[0003] The existing purification process can no longer meet the new emission standards. The dry purification exhaust gas has excessive fluorine content, low purification efficiency and poor effect, and cannot meet the requirements for fluorine removal from electrolytic aluminum flue gas. At the same time, the generated compounds are difficult to recycle and cannot be operated continuously.

[0004] To this end, we propose a new wet purification device for removing fluoride from electrolytic aluminum flue gas. Summary of the invention

[0005] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a new wet purification device for removing fluoride from electrolytic aluminum fume.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a novel wet purification device for removing fluoride from electrolytic aluminum fume, comprising a mounting frame, a first reaction cylinder is fixedly installed on the left side of the top of the mounting frame, a shunt pipe is fixedly installed on the lower end of the right wall of the first reaction cylinder, a flue gas pipe is fixedly installed on the middle end of the bottom of the shunt pipe, a second reaction cylinder is fixedly installed on the right wall of the shunt pipe, a first opening and closing door is movably installed on the left wall of the first reaction cylinder, a sodium carbonate feed pipe is fixedly installed on the middle end of the top of the first reaction cylinder, a sodium aluminate feed pipe is fixedly installed on the left side of the top of the first reaction cylinder, a one-way exhaust pipe is fixedly installed on the right side of the top of the first reaction cylinder, and the second reaction cylinder A second opening and closing door is movably installed on the right side wall, an ammonia feeding pipe is fixedly installed on the top middle end of the second reaction cylinder, an aluminum sulfate feeding pipe is fixedly installed on the top left side of the second reaction cylinder, and an anhydrous sodium sulfate feeding pipe is fixedly installed on the top right side of the second reaction cylinder. A first rapid reaction stirring mechanism is arranged inside the first reaction cylinder, and a second rapid reaction stirring mechanism is arranged inside the second reaction cylinder, and the structure of the second rapid reaction stirring mechanism is consistent with that of the first rapid reaction stirring mechanism. The first rapid reaction stirring mechanism includes a servo motor, and the bottom of the servo motor is fixedly connected to the top of the first reaction cylinder, and the output end of the servo motor movably passes through the top of the inner wall of the first reaction cylinder.

[0007] Preferably, a large gear is fixedly mounted on the output end of the servo motor, and a mounting plate is movably mounted on the bottom of the large gear.

[0008] Preferably, the bottom of the second reaction cylinder is fixedly connected to the top right side of the mounting frame.

[0009] Preferably, a first pinion is movably engaged with the left side of the outer wall of the large gear, and the bottom of the first pinion movably penetrates the bottom of the mounting plate.

[0010] Preferably, a first mounting frame is fixedly mounted on the bottom of the first pinion.

[0011] Preferably, a first stirring rod is fixedly mounted on the bottom of the first mounting frame.

[0012] Preferably, a second pinion gear is movably engaged on the right side of the outer wall of the large gear, and the bottom of the second pinion gear movably penetrates the bottom of the mounting plate.

[0013] Preferably, a second mounting frame is fixedly mounted on the bottom of the second pinion.

[0014] Preferably, a second stirring rod is fixedly mounted on the bottom of the second mounting frame.

[0015] Beneficial Effects

[0016] The present invention provides a novel wet purification device for removing fluoride from electrolytic aluminum fume. It has the following beneficial effects:

[0017] (1) This novel wet purification device for removing fluoride from electrolytic aluminum fume is provided with a first rapid reaction stirring mechanism and a second rapid reaction stirring mechanism. The servo motor in the first rapid reaction stirring mechanism and the second rapid reaction stirring mechanism can drive the large gear to start rotating, and the large gear drives the first small gear and the second small gear to start rotating and revolving respectively. The first small gear and the second small gear drive the first stirring rod and the second stirring rod to revolve while rotating respectively through the first mounting frame and the second mounting frame, thereby stirring the solutions in the first reaction cylinder and the second reaction cylinder, accelerating the efficiency of the chemical reaction, improving the effect of the chemical reaction of the entire device, meeting the requirements for removing fluoride from electrolytic aluminum fume, and at the same time, the generated compounds can be recycled and can be operated continuously.

[0018] (2) The novel wet purification device for removing fluoride from electrolytic aluminum fume is provided with a sodium aluminate feed pipe, which can feed sodium aluminate into the sodium fluoride in the first reaction cylinder to generate cryolite, thereby enabling the generated compounds to be recycled.

[0019] (3) The novel wet purification device for removing fluoride from electrolytic aluminum flue gas is provided with an aluminum sulfate feed pipe and an anhydrous sodium sulfate feed pipe. The aluminum sulfate feed pipe and the anhydrous sodium sulfate feed pipe can respectively feed aluminum sulfate and anhydrous sodium sulfate into the second reaction tube to generate cryolite, so that the generated compounds can be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the utility model can be implemented, so they have no substantial technical significance.

[0021] Figure 1 It is a schematic diagram of the overall structure of the front side of the present invention;

[0022] Figure 2 This is a schematic structural diagram of the first rapid reaction stirring mechanism of the present invention.

[0023] Legend: 10. Mounting frame; 11. First reaction tube; 12. Diverter pipe; 13. Smoke pipe; 14. Second reaction tube; 15. First opening and closing door; 16. Sodium carbonate feed pipe; 17. Sodium aluminate feed pipe; 18. One-way exhaust pipe; 19. Second opening and closing door; 20. Ammonia feed pipe; 21. Aluminum sulfate feed pipe; 22. Anhydrous sodium sulfate feed pipe; 23. Servo motor; 24. Large gear; 25. Mounting plate; 26. First pinion; 27. First mounting frame; 28. First stirring rod; 29. ​​Second pinion; 30. Second mounting frame; 31. Second stirring rod. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the implementation of the present invention or the technical solution in the prior art, the following briefly introduces the drawings required for the implementation or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0025] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "inner", "outer", "side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invented product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1: A novel wet purification device for removing fluoride from electrolytic aluminum flue gas, such as Figure 1 As shown, it includes a mounting frame 10, a first reaction cylinder 11 is fixedly installed on the left side of the top of the mounting frame 10, a shunt pipe 12 is fixedly installed on the lower end of the right side wall of the first reaction cylinder 11, a flue gas pipe 13 is fixedly installed on the bottom middle end of the shunt pipe 12, a second reaction cylinder 14 is fixedly installed on the right side wall of the shunt pipe 12, and the bottom of the second reaction cylinder 14 is fixedly connected to the right side of the top of the mounting frame 10, a first opening and closing door 15 is movably installed on the left side wall of the first reaction cylinder 11, and a first opening and closing door 15 is fixedly installed on the top middle end of the first reaction cylinder 11. A sodium carbonate feed pipe 16 is fixedly installed on the top left side of the first reaction cylinder 11, a sodium aluminate feed pipe 17 is fixedly installed on the top right side of the first reaction cylinder 11, a second opening and closing door 19 is movably installed on the right side wall of the second reaction cylinder 14, an ammonia water feed pipe 20 is fixedly installed on the top middle end of the second reaction cylinder 14, an aluminum sulfate feed pipe 21 is fixedly installed on the top left side of the second reaction cylinder 14, and an anhydrous sodium sulfate feed pipe 22 is fixedly installed on the top right side of the second reaction cylinder 14. A first rapid reaction stirring mechanism is provided inside the first reaction tube 11, and a second rapid reaction stirring mechanism is provided inside the second reaction tube 14, and the structure of the second rapid reaction stirring mechanism is consistent with that of the first rapid reaction stirring mechanism. By providing the first rapid reaction stirring mechanism and the second rapid reaction stirring mechanism, the servo motor 23 in the first rapid reaction stirring mechanism and the second rapid reaction stirring mechanism can drive the large gear 24 to start rotating, and the large gear 24 drives the first small gear 26 and the second small gear 29 to start rotating and revolving at the same time, and the first small gear 26 and the second small gear 29 drive the first stirring rod 28 and the second stirring rod 31 to revolve while rotating through the first mounting frame 27 and the second mounting frame 30, respectively, so as to achieve stirring of the solutions in the first reaction tube 11 and the second reaction tube 14, accelerate the efficiency of the chemical reaction, improve the effect of the chemical reaction of the entire device, meet the requirements of defluorination of electrolytic aluminum fume, and at the same time, the generated compounds can be recycled and can be operated continuously.

[0031] Embodiment 2: Based on Embodiment 1, Figure 2As shown, the first rapid reaction stirring mechanism includes a servo motor 23, and the bottom of the servo motor 23 is fixedly connected to the top of the first reaction tube 11, the output end of the servo motor 23 movably penetrates the top of the inner wall of the first reaction tube 11, the output end of the servo motor 23 is fixedly installed with a large gear 24, the bottom of the large gear 24 is movably installed with a mounting plate 25, the left side of the outer wall of the large gear 24 is movably meshed with a first small gear 26, and the bottom of the first small gear 26 movably penetrates the bottom of the mounting plate 25, and by setting a sodium aluminate feeding pipe 17, the sodium aluminate feeding pipe 17 can feed sodium aluminate into the sodium fluoride in the first reaction tube 11 to generate cryolite, so that the generated compound can be recycled.

[0032] Embodiment 3: Based on Embodiment 1 and Embodiment 2, Figure 2 As shown, a first mounting frame 27 is fixedly mounted on the bottom of the first pinion 26, a first stirring rod 28 is fixedly mounted on the bottom of the first mounting frame 27, a second pinion 29 is movably meshed on the right side of the outer wall of the large gear 24, and the bottom of the second pinion 29 movably penetrates the bottom of the mounting plate 25, a second mounting frame 30 is fixedly mounted on the bottom of the second pinion 29, and a second stirring rod 31 is fixedly mounted on the bottom of the second mounting frame 30, and an aluminum sulfate feed pipe 21 and anhydrous sodium sulfate feed pipe 22 are provided, and the aluminum sulfate feed pipe 21 and the anhydrous sodium sulfate feed pipe 22 can respectively feed aluminum sulfate and anhydrous sodium sulfate into the second reaction tube 14 to generate cryolite, so that the generated compounds can be recycled.

[0033] The working principle of the present invention is as follows: sodium carbonate is fed into the first reaction cylinder 11 through the sodium carbonate feed pipe 16, and ammonia water is fed into the second reaction cylinder 14 through the ammonia water feed pipe 20. The flue gas pipe 13 transports the fluorine-containing flue gas to the first reaction cylinder 11 and the second reaction cylinder 14 through the diversion pipe 12 respectively. The first fluorine-containing flue gas undergoes a chemical reaction through the sodium carbonate in the first reaction cylinder 11 to generate sodium fluoride. The specific chemical formula is as follows:

[0034] HF+Na2CO3=NaF+NaHCO3

[0035] 2HF+Na2CO3=2NaF+CO2+H2O

[0036] When sodium fluoride reaches a certain concentration, cryolite can be obtained by adding a certain amount of sodium aluminate through the sodium aluminate feed pipe 17. The specific chemical formula is as follows:

[0037] NaF+NaAlO2=Na3AlF6+4NH3+2H2O

[0038] The second fluorine-containing flue gas undergoes a chemical reaction through the ammonia water in the second reaction tube 14 to generate ammonium fluoride. The specific chemical formula is as follows:

[0039] HF+NH3=NH4F

[0040] Aluminum sulfate and anhydrous sodium sulfate are added to the generated ammonium fluoride to generate cryolite. The specific chemical formula is as follows:

[0041] NH4F+Al2(SO4)3+Na2SO4=2Na3AlF6+3(NH4)2SO4

[0042] By simultaneously turning on the switches of the servo motors 23 in the first rapid reaction stirring mechanism and the second rapid reaction stirring mechanism, the output end of the servo motor 23 drives the large gear 24 to start rotating, and the large gear 24 drives the first small gear 26 and the second small gear 29 to start rotating and revolving simultaneously, and the first small gear 26 and the second small gear 29 drive the first stirring rod 28 and the second stirring rod 31 to revolve while rotating through the first mounting frame 27 and the second mounting frame 30, respectively, so as to achieve stirring of the solutions in the first reaction cylinder 11 and the second reaction cylinder 14 and accelerate the efficiency of their chemical reactions.

[0043] Working principle of the present invention:

[0044] By setting up a first rapid reaction stirring mechanism and a second rapid reaction stirring mechanism, the servo motors in the first rapid reaction stirring mechanism and the second rapid reaction stirring mechanism can drive the large gear to start rotating, and the large gear drives the first small gear and the second small gear to start rotating and revolving respectively, and the first small gear and the second small gear drive the first stirring rod and the second stirring rod to revolve while rotating through the first mounting frame and the second mounting frame respectively, so as to achieve stirring of the solutions in the first reaction cylinder and the second reaction cylinder, accelerate the efficiency of the chemical reaction, improve the effect of the chemical reaction of the entire device, meet the requirements of defluorination of electrolytic aluminum fume, and at the same time, the generated compounds can be recycled and can be operated continuously.

[0045] By setting up a sodium aluminate feeding pipe, the sodium aluminate feeding pipe can feed sodium aluminate into the sodium fluoride in the first reaction cylinder to generate cryolite, so that the generated compound can be recycled.

[0046] By setting up an aluminum sulfate feeding pipe and an anhydrous sodium sulfate feeding pipe, the aluminum sulfate feeding pipe and the anhydrous sodium sulfate feeding pipe can respectively feed aluminum sulfate and anhydrous sodium sulfate into the second reaction cylinder to generate cryolite, so that the generated compounds can be recycled.

[0047] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A novel wet purification device for removing fluoride from aluminum electrolysis flue gas, comprising a mounting frame (10), characterized in that: A first reaction tube (11) is fixedly mounted on the left side of the top of the mounting frame (10); a shunt pipe (12) is fixedly mounted on the lower end of the right side wall of the first reaction tube (11); a smoke pipe (13) is fixedly mounted on the middle end of the bottom of the shunt pipe (12); a second reaction tube (14) is fixedly mounted on the right side wall of the shunt pipe (12); a first opening and closing door (15) is movably mounted on the left side wall of the first reaction tube (11); a sodium carbonate feed pipe (16) is fixedly mounted on the middle end of the top of the first reaction tube (11); a sodium aluminate feed pipe (17) is fixedly mounted on the left side of the top of the first reaction tube (11); a one-way exhaust pipe (18) is fixedly mounted on the right side of the top of the first reaction tube (11); and a second opening and closing door (19) is movably mounted on the right side wall of the second reaction tube (14). ), an ammonia water feeding pipe (20) is fixedly installed at the middle end of the top of the second reaction cylinder (14), an aluminum sulfate feeding pipe (21) is fixedly installed at the left side of the top of the second reaction cylinder (14), and an anhydrous sodium sulfate feeding pipe (22) is fixedly installed at the right side of the top of the second reaction cylinder (14), a first rapid reaction stirring mechanism is arranged inside the first reaction cylinder (11), a second rapid reaction stirring mechanism is arranged inside the second reaction cylinder (14), and the structure of the second rapid reaction stirring mechanism is consistent with that of the first rapid reaction stirring mechanism, the first rapid reaction stirring mechanism includes a servo motor (23), and the bottom of the servo motor (23) is fixedly connected to the top of the first reaction cylinder (11), and the output end of the servo motor (23) movably penetrates the top of the inner wall of the first reaction cylinder (11).

2. The novel electrolytic aluminum fume fluoride removal wet purification device according to claim 1 is characterized in that: A large gear (24) is fixedly mounted on the output end of the servo motor (23), and a mounting plate (25) is movably mounted on the bottom of the large gear (24).

3. The novel electrolytic aluminum fume fluoride removal wet purification device according to claim 1 is characterized in that: The bottom of the second reaction cylinder (14) is fixedly connected to the top right side of the mounting frame (10).

4. The novel electrolytic aluminum fume fluoride removal wet purification device according to claim 2 is characterized in that: A first pinion gear (26) is movably engaged with the left side of the outer wall of the large gear (24), and the bottom of the first pinion gear (26) movably penetrates the bottom of the mounting plate (25).

5. The novel wet purification device for removing fluoride from electrolytic aluminum fume according to claim 4 is characterized in that: A first mounting frame (27) is fixedly mounted on the bottom of the first pinion gear (26).

6. The novel electrolytic aluminum fume fluoride removal wet purification device according to claim 5 is characterized in that: A first stirring rod (28) is fixedly mounted on the bottom of the first mounting frame (27).

7. The novel wet purification device for removing fluoride from electrolytic aluminum fume according to claim 2 is characterized in that: A second pinion gear (29) is movably engaged with the right side of the outer wall of the large gear (24), and the bottom of the second pinion gear (29) movably penetrates the bottom of the mounting plate (25).

8. The novel electrolytic aluminum fume fluoride removal wet purification device according to claim 7 is characterized in that: A second mounting frame (30) is fixedly mounted on the bottom of the second pinion (29).

9. The novel electrolytic aluminum fume fluoride removal wet purification device according to claim 8 is characterized in that: A second stirring rod (31) is fixedly mounted on the bottom of the second mounting frame (30).

Images