A stirring structure and flotation machine for treating electrolytic carbon slag

Abstract

This utility model discloses a stirring structure for a flotation machine used in the treatment of electrolytic carbon slag, belonging to the technical field of stirring equipment for flotation machines. The specific structure includes a drive shaft, a stirring rotor, a stirring stator, and stator guide vanes. The stirring rotor is fixedly connected to the lower end of the drive shaft, and the stirring stator is fixedly connected to a support pipe. The support pipe is sleeved around the drive shaft and coaxial with it. The annular cavity between the support pipe and the drive shaft is used to transport air and slurry into the flotation tank. Multiple stator guide vanes are evenly fixedly connected to a guide cover plate, which is fixedly connected to the support pipe. The multiple stator guide vanes are located outside the stirring stator. The upper end of the support pipe is fixedly connected to a support frame. This utility model can eliminate the spin during slurry stirring, reduce slurry turbulence, ensure a stable liquid surface, and effectively prevent excessive turbulence in the turbulent zone from interfering with the diversion zone and froth zone of the flotation process.

Description

Technical Field

[0001] This utility model belongs to the technical field of flotation machines for electrolytic carbon slag treatment, specifically relating to a stirring structure of a flotation machine for electrolytic carbon slag treatment, and also relating to a flotation machine for electrolytic carbon slag treatment. Background Technology

[0002] In the electrolytic production of metallic aluminum, the generation of carbon slag is unavoidable. The causes of carbon slag generation are: (1) uneven combustion and selective oxidation of the carbon anode leading to carbon particle detachment; (2) carbon particle detachment caused by the erosion and scouring of the carbon anode by the aluminum liquid and electrolyte; (3) free solid carbon generated by secondary reactions during the electrolysis process; and (4) mechanical losses caused by improper operation. Among these, (1) is the main cause of carbon slag generation.

[0003] Due to immersion and penetration by electrolytes, the electrolyte content in the carbon slag is very high, accounting for about 60%-70% of the weight of the carbon slag. Its main components are cryolite and sub-cryolite, with a small amount of alumina and calcium fluoride.

[0004] The carbon and electrolytes in the carbon slag are extracted separately using flotation. This method utilizes the fact that these two substances are insoluble in water and have different specific gravities, allowing them to be separated under the action of flotation reagents.

[0005] After being thoroughly mixed with flotation reagents, the dilute slurry flows into a flotation machine for flotation. The flotation machine separates the carbon slurry from the top, which flows into a carbon slurry tank. The underflow material (electrolyte) flows from the side into a settling tank and settles to obtain the electrolyte.

[0006] Flotation machines are further divided into two types based on the air supply method: mechanical agitation self-priming type and mechanical agitation compressed air type. In the former, the agitator simultaneously agitates and draws in air and breaks it into fine bubbles; when the rotor rotates, cavities are formed behind the blades, drawing in air, and the slurry surrounding the blades forms two rows of opposing rotating vortices. Air is drawn into the center of these vortices and forms bubbles.

[0007] When the slurry thrown out by the impeller collides with the stator blades, a new vortex is generated. When the turbulence intensity in the turbulent zone of the flotation machine is too high, its flow will interfere with the diversion zone and froth zone of the flotation process, causing the slurry surface to become unstable and the phenomenon of frothing occurs, which is not conducive to the separation of materials. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a stirring structure for a flotation machine for electrolytic carbon slag disposal, which can eliminate the slurry spin, slow down the slurry turbulence, ensure the stability of the liquid surface, and improve the material separation effect during the electrolytic carbon slag flotation process.

[0009] The technical solution adopted by this utility model is as follows: a stirring structure for a flotation machine used for electrolytic carbon slag treatment, comprising a drive shaft, a stirring rotor, a stirring stator, and stator guide vanes. The stirring rotor is fixedly connected to the lower end of the drive shaft, and the stirring stator is fixedly connected to a support pipe and rotates around the drive shaft. The support pipe is sleeved around the drive shaft and coaxial with it. The annular cavity between the support pipe and the drive shaft is used to transport air and slurry into the flotation tank. Multiple stator guide vanes are uniformly fixedly connected to a guide cover plate, and the guide cover plate is fixedly connected to... The improved stirring structure is installed on the support tube with multiple stator guide vanes on the outside of the stirring stator. The drive shaft is connected to the power mechanism (composed of a power motor and a belt drive mechanism). The power mechanism is installed on the support frame at the top of the flotation machine. The upper end of the support tube is fixedly connected to the support frame. The bottom of the support tube is provided with a feed port and a discharge port. Installing the improved stirring structure on the flotation machine can eliminate the self-spinning of the slurry during the stirring process, slow down the turbulence of the slurry, ensure a stable liquid surface, and effectively prevent the excessive turbulence intensity in the turbulent zone of the flotation machine from interfering with the diversion zone and froth zone of the flotation process.

[0010] Furthermore, the aforementioned stirring rotor includes a rotor base plate and rotor blades. The rotor base plate is fixedly connected to the drive shaft. Multiple rotor blades are uniformly fixedly connected to the upper part of the rotor base plate and installed at a radial deflection angle with respect to the drive shaft, i.e., a clockwise or counterclockwise deflection angle α. The stirring stator includes a stator cover plate and stator blades. The stator cover plate is fixedly connected to the lower end of the support tube. Multiple stator blades are uniformly fixedly connected to the bottom of the stator cover plate and installed at a radial deflection angle with respect to the drive shaft, i.e., a deflection angle β between the stator blades and the rotor blades in opposite directions of rotation. The stator guide vanes are installed at a radial deflection angle with respect to the drive shaft, i.e., a deflection angle δ between the stator guide vanes and the stator blades in opposite directions of rotation, where δ ranges from 0° to 45°.

[0011] Furthermore, the aforementioned stator guide vanes can be straight plates of equal thickness, trapezoidal plates of varying thickness, or curved blades.

[0012] Furthermore, the aforementioned stator guide vanes correspond to the stator blades and are arranged in a star shape.

[0013] Furthermore, the aforementioned stator guide vanes employ multiple sets of asymmetrically arranged guide blades.

[0014] A flotation machine for treating electrolytic carbon slag includes a flotation machine body and a stirring structure mounted on the flotation machine body via a support frame.

[0015] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model adds stator guide vanes to the outside of the stator, which can eliminate the slurry spin, slow down the slurry turbulence, ensure the stability of the liquid surface, improve the material separation effect, and effectively avoid the problem that the excessive turbulence intensity in the turbulent zone of the flotation machine will interfere with the diversion zone and foam zone of the flotation process, causing the slurry liquid surface to be unstable and the phenomenon of frothing, which is not conducive to the separation of materials. Through experimental verification, compared with the previous stirring structure, the stirring structure of this invention increases the calorific value of the carbon powder product by 45%, increases the fixed carbon by 43%, reduces the ash content by 40%, and reduces the volatile matter by 54%. Attached Figure Description

[0016] Figure 1 A bottom view schematic diagram of the stirring structure of a flotation machine for treating electrolytic carbon slag;

[0017] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the middle AA section;

[0018] Figure 3 A three-dimensional schematic diagram (rotated) of the stirring structure of a flotation machine;

[0019] Figure 4 A schematic diagram of the rotor-stator-guide vane layout of the stirring structure of a flotation machine;

[0020] Figure 5 A schematic diagram of the asymmetrical rotor-stator-guide vane planar arrangement of the stirring structure of a flotation machine. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1: As Figure 1-5As shown, a stirring structure for a flotation machine used for electrolytic carbon slag treatment is disclosed. The flotation machine includes a drive shaft 4, a stirring rotor 1, a stirring stator 2, and stator guide vanes 3. The stirring rotor 1 is fixedly connected to the lower end of the drive shaft 4. The stirring stator 2 is fixedly connected to a support pipe 6, and the stirring rotor 1 rotates around the drive shaft 4. The support pipe 6 is sleeved around the drive shaft 4 and coaxial with it. An annular chamber 7 between the support pipe 6 and the drive shaft 4 is used to supply air and slurry to the flotation tank. Multiple stator guide vanes 3 are evenly fixedly connected to a guide cover plate 5. The guide cover plate 5 is fixedly connected to the support pipe 6, and the multiple stator guide vanes 3 are located outside the stirring stator 2. The drive shaft 4 is connected to a power mechanism (motor and belt). The transmission mechanism consists of a power mechanism mounted on a support frame at the top of the flotation machine. The upper end of the support pipe 6 is fixedly connected to the support frame. The bottom of the support pipe 6 is provided with a feed inlet 8 and a discharge outlet 9. The improved stirring structure is installed on the flotation machine, which can eliminate the self-spinning during the slurry stirring process, slow down the slurry turbulence, ensure the stability of the liquid surface, and effectively avoid the problem that the excessive turbulence intensity in the turbulent zone of the flotation machine will interfere with the diversion zone and foam zone of the flotation process, causing the slurry liquid surface to be unstable, resulting in the phenomenon of frothing and the problem of unfavorable material separation. Through experimental verification, compared with the previous stirring structure, the stirring structure of the present invention increases the calorific value of the carbon powder product by 45%, increases the fixed carbon by 43%, reduces the ash content by 40%, and reduces the volatile matter by 54%.

[0023] The stirring rotor 1 includes a rotor base plate 10 and rotor blades 11. The rotor base plate 10 is fixedly connected to the drive shaft 4. The rotor blades 11 are multiple pieces, circumferentially and uniformly fixedly connected to the upper part of the rotor base plate 10 and installed at a radial deflection angle with the drive shaft 4, i.e., a clockwise or counterclockwise deflection angle α. The stirring stator 2 includes a stator cover plate 12 and stator blades 13. The stator cover plate 12 is fixedly connected to the lower end of the support tube 6. The stator blades 13 are multiple pieces, circumferentially and uniformly fixedly connected to the bottom of the stator cover plate 12 and installed at a radial deflection angle with the drive shaft 4, i.e., a deflection angle β between the stator blades 13 and the rotor blades 11 in the opposite direction of rotation. The stator guide vanes 3 are installed at a radial deflection angle with the drive shaft 4, i.e., a deflection angle δ between the stator guide vanes 3 and the stator blades 13 in the opposite direction of rotation, with a range of δ from 0° to 45° to ensure optimal performance.

[0024] Specifically, the stator guide vane 3 adopts a straight plate of equal thickness, a trapezoidal plate of variable thickness, or a curved blade.

[0025] Specifically, the stator guide vane 3 corresponds to the stator blade 13 and is arranged in a star shape.

[0026] Example 2: As Figure 4 As shown, unlike Example 1, the stator guide vane 3 uses multiple sets of asymmetrically arranged guide vanes. The asymmetrical arrangement can directionally enhance the liquid surface stability at the scraper discharge end according to the degree of slurry turbulence.

[0027] Example 3: A flotation machine for treating electrolytic carbon slag, comprising a flotation machine body and a stirring structure of Example 1 or Example 2, which are mounted on the flotation tank via a support frame. The stirring structure can extend into the flotation tank for stirring.

[0028] During flotation machine operation, the slurry ejected by the impeller of the agitator impacts the stator blades, creating turbulent vortices at the bottom of the flotation machine. If the turbulence intensity is too low, dead zones will appear at the bottom, affecting the flotation effect. If the turbulence intensity is too high, it will interfere with the diversion zone and froth zone of the flotation process, causing instability in the slurry surface and resulting in frothing, which is detrimental to material separation.

[0029] To address the aforementioned problems encountered during flotation machine operation, this invention adds stator guide vanes to the outside of the stator blades, further improving the properties of the gas, liquid, and solid phases in the flotation system. After passing through the stator, the liquid flow is evenly distributed along the horizontal cross-section under the guidance of the guide vanes. The lower part of the tank is a stirring zone, minimizing dead zones; the upper part of the tank is a relatively stable flotation separation zone, effectively preventing pulp spinning and reducing pulp turbulence, thus meeting the requirements of the flotation process.

[0030] Compared with the prior art, after implementing this patent, the slurry spin is effectively avoided, the slurry turbulence is slowed down, the liquid surface at the top of the tank is relatively stable, and the quality of flotation carbon powder products is effectively improved. As shown in Table 1, compared with the previous stirring structure, the stirring structure of the present invention increases the calorific value of carbon powder products by 45%, increases fixed carbon by 43%, reduces ash content by 40%, and reduces volatile matter by 54%.

[0031] Table 1 Comparison of flotation carbon powder product quality before and after patent implementation.

[0032] project Calorific value (cal / g) Fixed carbon (%) Ash content (%) Volatile matter (%) Carbon powder products before patent implementation 2674 48.76 47.83 3.41 Carbon powder products after patent implementation 3877 69.74 28.69 1.57

[0033] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A stirring structure for a flotation machine used for treating electrolytic carbon slag, characterized in that, The system includes a drive shaft (4), an agitator rotor (1), an agitator stator (2), and stator guide vanes (3). The agitator rotor (1) is fixedly connected to the lower end of the drive shaft (4). The agitator stator (2) is fixedly connected to the support tube (6) and located around the agitator rotor (1). The support tube (6) is sleeved outside the drive shaft (4). The annular cavity (7) between the support tube (6) and the drive shaft (4) is used to transport air and slurry into the flotation tank. Multiple stator guide vanes (3) are provided and are evenly fixedly connected to the guide cover plate (5) in the circumferential direction. The guide cover plate (5) is fixedly connected to the support tube (6), and multiple stator guide vanes (3) are set outside the agitator stator (2). The drive shaft (4) is connected to the power mechanism. The power mechanism is installed on the support frame at the top of the flotation machine. The upper end of the support tube (6) is fixedly connected to the support frame. The bottom of the support tube (6) is provided with a feed inlet (8) and a discharge outlet (9).

2. The stirring structure of a flotation machine for treating electrolytic carbon slag according to claim 1, characterized in that, The stirring rotor (1) includes a rotor base plate (10) and rotor blades (11). The rotor base plate (10) is fixedly connected to the drive shaft (4). The rotor blades (11) are multiple pieces, which are uniformly fixedly connected to the upper part of the rotor base plate (10) and installed at a radial deflection angle with the drive shaft (4), that is, deflected clockwise or counterclockwise by an angle α. The stirring stator (2) includes a stator cover plate (12) and stator blades (13). The stator cover plate (12) is fixedly connected to the lower end of the support tube (6). The stator blades (13) are multiple pieces, which are uniformly fixedly connected to the bottom of the stator cover plate (12) and installed at a radial deflection angle with the drive shaft (4), that is, the stator blades (13) and the rotor blades (11) are deflected at an angle β opposite to the rotation direction of the rotor blades (11).

3. The stirring structure of a flotation machine for treating electrolytic carbon slag according to claim 2, characterized in that, The stator guide vane (3) is installed with a radial deflection angle relative to the drive shaft (4), that is, the deflection angle δ is opposite to the rotation direction of the stator guide vane (3) and the stator blade (13), and the range of δ is 0°<δ≤45°.

4. The stirring structure of a flotation machine for treating electrolytic carbon slag according to claim 1, characterized in that, The stator guide vanes (3) are made of straight plates of equal thickness, trapezoidal plates of varying thickness, or curved blades.

5. The stirring structure of a flotation machine for treating electrolytic carbon slag according to claim 2, characterized in that, The stator guide vanes (3) correspond to the stator blades (13) and are arranged in a star shape.

6. The stirring structure of a flotation machine for treating electrolytic carbon slag according to claim 1, characterized in that, The stator guide vanes (3) adopt multiple sets of asymmetrically arranged guide vanes.

7. A flotation machine for treating electrolytic carbon slag, characterized in that, The flotation tank and the stirring structure described in any one of claims 1-6 are mounted on the flotation tank via a support frame. The stirring structure can extend into the flotation tank for stirring.

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