A cryolite recovery device for fluorine-containing waste slag from electrolytic aluminum

Abstract

The present invention relates to the technical field of cryolite recovery, and in particular to a cryolite recovery device for fluorine-containing waste slag from electrolytic aluminum. The recovery device comprises a box body, inside which a rolling assembly, a drug-adding filter assembly and a feeding assembly are arranged in sequence from top to bottom; the rolling assembly comprises a rolling part for composite rolling of the fluorine-containing waste slag; the drug-adding filter assembly comprises a cabin body for containing chemical agents, and a disordered part is arranged in the cabin body; the feeding assembly is used to take the cryolite out of the box body; the rolling assembly, the drug-adding filter assembly and the feeding assembly are integrated in the box body, and after the rolling is completed, they directly enter the drug-adding filter assembly for reaction, and after the cryolite is precipitated, it is taken away by the feeding assembly; the whole equipment has a high degree of integration, which greatly improves the processing time, eliminates the transfer process, and is conducive to the rapid recovery of cryolite; the present invention effectively solves the technical problems of many processes and long processing time in the recovery of fluorine-containing waste slag cryolite in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of cryolite recovery, and in particular to a cryolite recovery device for fluorine-containing waste slag from electrolytic aluminum. Background Art

[0002] Cryolite is a fluoroaluminate of alkali metals, also known as sodium fluoroaluminate, with a molecular formula of Na 3 AlF 6 As a chemical product, it is mainly used as a flux for smelting aluminum metal. It can also be used as an insecticide for crops, an enamel opacifier, a sunscreen and flux for glass and enamel production, a wear-resistant filler for resin rubber, and can also be used in the production of ferroalloys and boiling steel. With the rapid development of the aluminum industry, its potential market share has gradually increased, and the requirements for quality have become higher and higher. In the process of electrolytic aluminum production, in order to ensure normal production, the electrolyte in the electrolytic cell must be kept at a reasonable height and cleanliness. Therefore, it is necessary to extract the excess electrolyte and salvage the solids floating on the top of the electrolyte. These solids become fluorine-containing waste slag after condensation, and these fluorine-containing waste slags are mixed with cryolite.

[0003] In order to recover cryolite, currently hydrofluoric acid is added to the fluorine-containing waste residue, stirred and filtered, and then impurities are removed to recover cryolite. In the prior art, adding, stirring and filtering the fluorine-containing waste residue are multiple processes, which require many equipment components. After one process is completed, it takes a certain amount of time to transport it to the next process. The waste residue treatment time is too long, which is not conducive to the rapid recovery of cryolite. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a cryolite recovery device for fluorine-containing waste slag of electrolytic aluminum, so as to solve the technical problems of multiple processes and long processing time in the recovery of fluorine-containing waste slag cryolite in the prior art.

[0005] In order to achieve the above-mentioned purpose, the cryolite recovery device for fluorine-containing waste slag of aluminum electrolysis provided by the present invention adopts the following technical scheme:

[0006] A cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis, comprising:

[0007] The box body has a rolling assembly, a dosing and filtering assembly and a feeding assembly arranged therein from top to bottom;

[0008] A rolling assembly, including a rolling piece for composite rolling of fluorine-containing waste residue;

[0009] The dosing and filtering assembly comprises a cabin containing a chemical agent for precipitating cryolite, wherein a turbulent element for accelerating the contact between the chemical agent and the fluorine-containing waste residue for reaction is arranged in the cabin;

[0010] The material conveying component is used to carry out cryolite from the waste residue after the reaction of the dosing and filtering components in the box.

[0011] Furthermore, the rolling assembly includes two parallelly arranged mounting plates provided on the upper side of the box body, a rolling cylinder is provided between the two mounting plates and is rotatably matched with the two mounting plates, a feed port is provided on the rolling cylinder, and the rolling assembly also includes a first driving mechanism which is transmission-connected to the rolling cylinder to drive the rolling cylinder to rotate.

[0012] Furthermore, there are a plurality of rolling rollers and a transmission shaft between the two mounting plates, which are rotatably matched with the two mounting plates. The rolling assembly also includes a second driving mechanism connected to the transmission shaft to drive the transmission shaft to rotate, and the transmission shaft is transmission-connected to each of the rolling rollers.

[0013] Furthermore, a semi-open material drop bin covering the rolling cylinder is fixed between the two mounting plates. The upper part of the material drop bin is open, and the lower part has a material drop channel connected to the dosing filter assembly. The rolling cylinder also has a material drop port for aligning with the material drop bin, and a material drop filter plate is installed at the material drop port to control the material drop speed.

[0014] Furthermore, the turbulent element includes an inner filter element rotatably mounted in the cabin and an outer filter element rotatably mounted on the outside of the inner filter element, the inner filter element is used to receive fluorine-containing waste residue and allow the fluorine-containing waste residue to pass through to enter the feeding assembly, and the cabin also has a third driving mechanism for controlling the relative rotation of the inner filter element and the outer filter element.

[0015] Furthermore, the inner filter element includes an inner filter ball and a connecting tube connected to the lower end of the inner filter ball, the lower end of the connecting tube extends into the feeding assembly, and the outer filter element includes an outer filter ball and an outer tube connected to the lower end of the outer filter ball, and the upper ends of the inner filter ball and the outer filter ball are rotatably assembled at the material delivery channel of the material delivery bin.

[0016] Furthermore, the third driving mechanism includes a horizontally arranged third motor, the output end of the third motor is connected to a longitudinally rotating driving gear, the lower end of the connecting tube protrudes from the outer tube, a first horizontal gear meshing with the driving gear is fixed to the outside of the outer tube, and a second horizontal gear meshing with the driving gear is fixed to the outside of the connecting tube, and the first horizontal gear and the second horizontal gear are used to drive the outer filter ball and the inner filter ball to rotate in opposite directions respectively under the drive of the driving gear.

[0017] Furthermore, the box body includes an L-shaped body and a cabin body, the L-shaped body has a higher first upper end face and a lower second upper end face, the cabin body is arranged on the second upper end face, the feeding assembly is arranged in the L-shaped body, and a balancing liquid with a liquid level higher than the height of the chemical agent in the cabin is arranged in the L-shaped body, so as to utilize the water level pressure difference to ensure the height of the chemical agent in the cabin.

[0018] Furthermore, the material conveying assembly includes a conveying dragon that extends out of the L-shaped body from bottom to top.

[0019] The beneficial effects of the cryolite recovery device for fluorine-containing waste slag of aluminum electrolysis provided by the present invention are:

[0020] 1) The rolling component, the dosing and filtering component and the feeding component are integrated in the box. After the rolling is completed, it directly enters the dosing and filtering component for reaction. After the cryolite is precipitated, it is taken away by the feeding component. The whole equipment has a high degree of integration, which greatly improves the processing time, eliminates the transfer process, and is conducive to the rapid recovery of cryolite.

[0021] 2) The rotating rolling cylinder and multiple rolling rollers in the rolling assembly realize the composite rolling of the fluorine-containing waste residue, which fully crushes the waste residue in a limited space, so that the cryolite can be extracted more completely during the subsequent dosing reaction and filtration;

[0022] 3) The two outer filter balls and the inner filter balls rotating in opposite directions can make the chemical agent and the fluorine-containing waste residue fully contact, so that the cryolite in the fluorine-containing waste residue is precipitated quickly and completely, thereby increasing the reaction rate;

[0023] 4) The L-shaped body of the box uses the water level pressure difference to ensure the height of the chemical agent in the cabin, thereby fully ensuring that the chemical agent is stably in the cabin for reaction;

[0024] In summary, through the above-mentioned configuration, the present invention effectively solves the technical problems existing in the prior art of multiple processes and long processing time in the recovery of fluorine-containing waste slag cryolite. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The invention provides a three-dimensional schematic diagram of the cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis. Figure 1 ;

[0026] Figure 2 The invention provides a three-dimensional schematic diagram of the cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis. Figure 2 ;

[0027] Figure 3 The invention provides a three-dimensional schematic diagram of the cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis. Figure 3(The rolling cylinder is not displayed);

[0028] Figure 4 This is a partial schematic diagram of the cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis provided by the present invention. Figure 1 (Showing the bottom of the drop bin);

[0029] Figure 5 The invention provides a three-dimensional schematic diagram of the cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis. Figure 4 (The cabin is not shown);

[0030] Figure 6 The invention provides a three-dimensional schematic diagram of the cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis. Figure 5 (Cabin and external filter are not shown);

[0031] Figure 7 The invention provides a three-dimensional schematic diagram of the cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis. Figure 6 (Showing the fit of the third motor, outer tube and connecting tube);

[0032] Figure 8 The invention provides a three-dimensional schematic diagram of the cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis. Figure 7 (L-type body not shown).

[0033] Numbers in the figure: 1. Box body; 2. Mounting plate; 3. Rolling cylinder; 4. Feed inlet; 5. Mounting frame; 6. First motor; 7. Transmission belt; 8. Rolling roller; 9. Transmission shaft; 10. Second motor; 11. Transmission gear; 12. Driven gear; 13. Dropping bin; 14. Dropping channel; 15. Dropping filter plate; 16. Inner filter ball; 17. Connecting pipe; 18. Outer filter ball; 19. Outer pipe; 20. Third motor; 21. Driving gear; 22. First horizontal gear; 23. Second horizontal gear; 24. L-shaped body; 25. Cabin; 26. First upper end face; 27. Second upper end face; 28. Conveying dragon. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the present invention more clear, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention.

[0035] The main concept of the present invention is to integrate the rolling component, the dosing and filtering component and the feeding component in the box 1. After the rolling is completed, it directly enters the dosing and filtering component for reaction. After the cryolite is precipitated, it is taken away by the feeding component. The whole equipment has a high degree of integration, which greatly improves the processing time, eliminates the transfer process, and is conducive to the rapid recovery of cryolite. The above concept is further elaborated in conjunction with specific embodiments below.

[0036] like Figure 1 and Figure 2 As shown, a cryolite recovery device for fluorine-containing waste slag of electrolytic aluminum comprises: a casing 1, inside which a rolling assembly, a dosing filter assembly and a feeding assembly are arranged in order from top to bottom; the rolling assembly comprises a rolling part for composite rolling of the fluorine-containing waste slag; the dosing filter assembly comprises a cabin 25 containing a chemical agent for precipitating cryolite, and the cabin 25 is provided with a turbulent part for accelerating the contact between the chemical agent and the fluorine-containing waste slag for reaction; the feeding assembly is used to bring out the cryolite from the waste slag after the reaction through the dosing filter assembly in the casing 1.

[0037] like Figure 2 and Figure 3 As shown, the rolling assembly includes two parallelly arranged mounting plates 2 provided on the upper side of the box body 1, a rolling cylinder 3 rotatably matched with the two mounting plates 2 is provided between the two mounting plates 2, a feed port 4 is provided on the rolling cylinder 3, and the rolling assembly also includes a first driving mechanism which is transmission-connected to the rolling cylinder 3 to drive the rolling cylinder 3 to rotate.

[0038] Specifically, one of the mounting plates 2 is connected to a mounting frame 5 , and the first driving mechanism includes a first motor 6 arranged on the mounting frame 5 , and an output end of the first motor 6 is connected to the rolling drum 3 via a transmission belt 7 .

[0039] like Figure 3 As shown, there are a plurality of rolling rollers 8 and a transmission shaft 9 between the two mounting plates 2, which are rotatably matched with the two mounting plates 2. The rolling assembly also includes a second driving mechanism connected to the transmission shaft 9 to drive the transmission shaft 9 to rotate. The transmission shaft 9 is connected to each of the rolling rollers 8. Specifically, the second driving mechanism is a second motor 10; a transmission gear 11 is fixed to one end of the transmission shaft 9, and a driven gear 12 meshing with the transmission gear 11 is provided at the end of each rolling roller 8. When the transmission shaft 9 rotates, the meshing of the transmission gear 11 with each driven gear 12 drives each rolling roller 8 to rotate. In addition, in this embodiment, the rotation direction of each rolling roller 8 is opposite to that of the rolling cylinder 3, so as to improve the effect of mixing and rolling the fluorine-containing waste residue.

[0040] like Figures 1 to 3 As shown, a semi-open material drop bin 13 covering the rolling cylinder 3 is fixed between the two mounting plates 2. The material drop bin 13 is open at the top and has a material drop channel 14 connected to the dosing filter assembly at the bottom. Figure 4 As shown, the rolling drum 3 also has a material dropping opening for aligning with the material dropping bin 13, and a material dropping filter plate 15 is installed at the material dropping opening to control the material dropping speed.

[0041] like Figures 5 to 7As shown, the turbulent element includes an inner filter element rotatably mounted in the cabin 25 and an outer filter element rotatably mounted on the outside of the inner filter element. The inner filter element is used to receive fluorine-containing waste residue and allow the fluorine-containing waste residue to pass through to enter the feeding assembly. The cabin 25 also has a third driving mechanism for controlling the relative rotation of the inner filter element and the outer filter element.

[0042] Specifically, the inner filter element includes an inner filter ball 16 and a connecting pipe 17 connected to the lower end of the inner filter ball 16, the lower end of the connecting pipe 17 extends into the feeding assembly, the outer filter element includes an outer filter ball 18 and an outer pipe 19 connected to the lower end of the outer filter ball 18, and the upper ends of the inner filter ball 16 and the outer filter ball 18 are both rotatably assembled at the material drop channel 14 of the material drop bin 13. In other embodiments, there may be only one inner filter ball, and no outer filter ball is provided.

[0043] In this embodiment, the third driving mechanism includes a third motor 20 arranged horizontally, the output end of the third motor 20 is connected to a driving gear 21 that rotates longitudinally, the lower end of the connecting tube 17 protrudes from the outer tube 19, the outer portion of the outer tube 19 is fixed with a first horizontal gear 22 that meshes with the driving gear 21, the outer portion of the connecting tube 17 is fixed with a second horizontal gear 23 that meshes with the driving gear 21, the first horizontal gear 22 and the second horizontal gear 23 are used to drive the outer filter ball 18 and the inner filter ball 16 to rotate in opposite directions under the drive of the driving gear 21. In other embodiments, two motors may be provided to drive the outer tube and the connecting tube to rotate respectively, instead of relying solely on a third motor to drive the outer tube and the connecting tube to rotate at the same time.

[0044] like Figure 1 As shown, the box 1 includes an L-shaped body 24 and a cabin 25, the L-shaped body 24 has a higher first upper end surface 26 and a lower second upper end surface 27, the cabin 25 is arranged on the second upper end surface 27, the feeding assembly is arranged in the L-shaped body 24, and a balancing liquid with a liquid level higher than the height of the chemical agent in the cabin 25 is arranged in the L-shaped body 24, so as to ensure the height of the chemical agent in the cabin 25 by using the water level pressure difference. Specifically, the feeding assembly includes a conveying dragon 28 extending obliquely from the bottom to the top of the L-shaped body 24.

[0045] The working principle of the cryolite recovery device for fluorine-containing waste slag of electrolytic aluminum provided by the present invention is: the fluorine-containing waste slag enters from the feed port 4 of the rolling cylinder 3, the first motor 6 and the second motor 10 are started, and the waste slag is fully crushed and crushed by the rolling cylinder 3 and the rolling roller 8. At the same time, the drop bin 13 is used to receive the waste slag dropped from the drop port of the rolling cylinder 3. The drop filter plate 15 at the drop port can control the drop speed to prevent the waste slag from entering the drop bin 13 before being completely crushed and crushed; after the waste slag enters the cabin 25 from the drop bin 13, the outer filter ball 18 and the inner filter ball 16 rotate relative to each other under the operation of the third motor 20, so that the chemical agent is fully in contact with the waste slag, reacts quickly, and precipitates cryolite. Cryolite is precipitated in the waste slag after the reaction, and after falling downward into the feeding assembly, it is taken out of the medicine box driven by the conveying dragon 28, thereby completing the recovery of cryolite.

Claims

1. A cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis, characterized in that: include: The box body has a rolling assembly, a dosing and filtering assembly and a feeding assembly arranged therein from top to bottom; A rolling assembly, including a rolling piece for composite rolling of fluorine-containing waste residue; The dosing and filtering assembly comprises a chamber containing a chemical agent for precipitating cryolite, wherein a turbulent member for accelerating the contact between the chemical agent and the fluorine-containing waste residue for reaction is arranged in the chamber; a feeding assembly for taking out cryolite from the waste residue after the reaction of the dosing and filtering assembly in the chamber; The turbulent element comprises an inner filter element rotatably mounted in the cabin and an outer filter element rotatably mounted outside the inner filter element, the inner filter element is used to receive fluorine-containing waste residue and allow the fluorine-containing waste residue to pass through and enter the feeding assembly, and the cabin also has a third driving mechanism for controlling the relative rotation of the inner filter element and the outer filter element; The rolling assembly comprises two parallel mounting plates arranged on the upper side of the box body, and a rolling cylinder is provided between the two mounting plates and is rotatably matched with the two mounting plates; There are also a plurality of rolling rollers and a transmission shaft between the two mounting plates, which are rotatably matched with the two mounting plates; The inner filter element comprises an inner filter ball and a connecting tube connected to the lower end of the inner filter ball, and the outer filter element comprises an outer filter ball and an outer tube connected to the lower end of the outer filter ball. The outer filter ball and the inner filter ball rotate in opposite directions. The box body includes an L-shaped body and a cabin body, the L-shaped body has a higher first upper end face and a lower second upper end face, the cabin body is arranged on the second upper end face, the feeding assembly is arranged in the L-shaped body, and a balancing liquid with a liquid level higher than the height of the chemical agent in the cabin is arranged in the L-shaped body, so as to utilize the water level pressure difference to ensure the height of the chemical agent in the cabin.

2. The cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis according to claim 1, characterized in that: A feed port is arranged on the rolling cylinder, and the rolling assembly also includes a first driving mechanism which is transmission-connected to the rolling cylinder to drive the rolling cylinder to rotate.

3. The cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis according to claim 2, characterized in that: The rolling assembly also includes a second driving mechanism connected to the transmission shaft to drive the transmission shaft to rotate, and the transmission shaft is transmission-connected to each of the rolling rollers.

4. The cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis according to claim 2 or 3, characterized in that: A semi-open material drop bin covering the rolling cylinder is also fixed between the two mounting plates. The upper part of the material drop bin is open, and the lower part has a material drop channel connected to the dosing filter assembly. The rolling cylinder also has a material drop port for aligning with the material drop bin, and a material drop filter plate is installed at the material drop port to control the material drop speed.

5. The cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis according to claim 4, characterized in that: The lower end of the connecting pipe extends into the feeding assembly, and the upper ends of the inner filter ball and the outer filter ball are both rotatably assembled at the material dropping channel of the material dropping bin.

6. The cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis according to claim 5, characterized in that: The third driving mechanism includes a third motor arranged horizontally, the output end of the third motor is connected to a longitudinally rotating driving gear, the lower end of the connecting tube protrudes from the outer tube, a first horizontal gear meshing with the driving gear is fixed to the outside of the outer tube, a second horizontal gear meshing with the driving gear is fixed to the outside of the connecting tube, and the first horizontal gear and the second horizontal gear are used to drive the outer filter ball and the inner filter ball to rotate in opposite directions respectively under the drive of the driving gear.

7. The cryolite recovery device for fluorine-containing waste slag from aluminum electrolysis according to claim 1, characterized in that: The material conveying assembly comprises a conveying dragon which extends obliquely from bottom to top from the L-shaped body.

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