Electrolytic aluminum roasting anode slotting powder returning system
By designing electrolytic aluminum roasted anode slotting powder distribution system, the combination technology of the whirlwind separator and the mixing warehouse is used to achieve the precise ratio of slot powder and fine powder, solving The problem of powder use improves the quality of theods and consumption balance.
Patent Information
- Application Number
- CN202411531729.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-01-21
AI Technical Summary
The existing anode production plants need to re-distribute and utilize the grooved powder at quantitative consumption, resulting in the inability to guarantee the quality of the anode.
An electrolytic aluminum roasting anode slotted powder redistribution system is designed, including a mixing bin, a first cyclone separator and a second cyclone separator. By accurately proportioning slotted powder and fine residual powder, the amount of residual anode is ensured. reduce while improving anode quality.
Through the remixing process of this system, the volume, density and quality of the anode can be effectively improved, the ash content can be reduced, the consumption of residual anode and slotting powder can be balanced, and the problem of accumulation of anode slotting powder and residual electrode can be solved.
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Figure CN119327328A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of electrolytic aluminum anode manufacturing, and in particular to a system for recycling powder from slotted electrolytic aluminum roasted anodes. Background Art
[0002] At present, molten salt electrolysis is used in industrial aluminum electrolysis. The aluminum electrolysis reaction mainly occurs in a high-temperature aluminum electrolysis cell at a temperature of 950-970°C. When direct current passes through the molten electrolyte, it reacts electrochemically with the anode carbon block, an oxidation reaction occurs at the anode, and a reduction reaction occurs at the cathode, producing molten aluminum.
[0003] During the electrolytic aluminum production process, the anode needs to be replaced regularly because of the accumulation of aluminum oxide, fluoride salts, electrolyte and other ash in the anode, which leads to a decrease in the anode electrolysis effect. The replaced anode is called a residual anode or residual electrode. In the anode manufacturing process, in order to save raw materials, the residual electrode is added to the raw materials for producing anodes, and then re-baked to form a new anode. Since the residual electrode accounts for a small proportion of the raw materials, as long as the amount of residual electrode added is controlled, the generated anode can still meet the quality requirements.
[0004] During the oxidation reaction at the anode, in order to prevent the gas generated at the bottom of the anode from accumulating at the bottom of the anode, affecting the inter-electrode conductivity, resulting in an increase in the voltage of the aluminum electrolytic cell and an increase in the power consumption, the current process is to slot the bottom of the anode along the length of the anode. This slotting method can guide more bubbles to the middle seam of the anode, strengthen the disturbance of the electrolyte area, and promote the dissolution and electrolysis reaction of aluminum oxide. Anode slotting in the aluminum electrolytic cell is conducive to stabilizing the fluctuating interface between the electrolyte and the aluminum liquid, shortening the inter-electrode distance, and reducing the power consumption. After the anode is slotted, a large amount of powder is produced, which is called slotting powder.
[0005] At present, factories have added anode scraps as raw materials to anode manufacturing. The adding method is to grind the anode scraps directly and add them to the anode raw materials without any other treatment. Because the anode scraps contain many impurities, adding the anode scraps to the raw materials will cause the quality of the anode to decrease. Therefore, in order to meet the standard requirements for anode quality, the amount of anode scraps added as raw materials per unit weight of anode must be less than the upper limit, and generally the amount of anode scraps added shall not exceed 25% of the total raw materials.
[0006] Slotted powder is only treated as waste materials; from the properties of slotted powder, it is the anode carbon block after roasting and has the same properties as the residual anode, and it has not passed through the electrolytic cell to participate in the reaction and a series of circulation processes, and has not come into contact with alumina, fluoride salts, electrolytes, etc. Therefore, its ash content is lower than that of the residual anode. Therefore, it can be used as a roasted anode raw material like the residual anode.
[0007] In actual anode production factories, the scale of production lines is fixed. When the amount of residual anodes added is not reduced, directly adding slotting powder to the raw materials for manufacturing anodes will inevitably cause an imbalance in the distribution ratio of each component in the anode manufacturing raw materials, making it impossible to guarantee the quality of the anodes.
[0008] Therefore, for manufacturers with fixed production line scale and production capacity, how to use both residual anode and slotted powder as anode raw materials and ensure that the anode quality meets the requirements is a problem. Summary of the invention
[0009] The present invention aims to provide a system for recycling slotted powder from aluminum electrolytic roasting anodes, so as to achieve the goal of meeting the quality requirements of anodes and solve the problem that existing anode production plants need to recycle slotted powder when consuming residual anodes in a quantitative manner.
[0010] In order to solve the above problems, the present invention provides a system for recycling slotted powder of electrolytic aluminum roasting anode, the system comprising a mixing bin, a first cyclone separator and a second cyclone separator, the feeding port of the mixing bin comprising a fine residual powder feeding port and a slotted powder feeding port, the fine residual powder feeding port is connected to a vibrating screen, the vibrating screen is equipped with a screen with a mesh diameter of 0.5 mm, the feeding port of the first cyclone separator is connected to a slotted powder feeding pipe, the discharge port of the first cyclone separator is connected to a slotted powder bin, the outlet of the slotted powder bin is connected to a rotary feeder with variable frequency speed regulation, the outlet of the rotary feeder is connected to a three-way valve, the other inlet of the three-way valve is connected to a Roots blower, the outlet of the three-way valve is connected to the second cyclone separator through a climbing pipeline, and the second cyclone separator is connected to the slotted powder feeding port.
[0011] The process of re-mixing the slotted powder in this scheme is as follows: the anode slotted powder is transported by the powder tank truck to the slotted powder silo, and after the discharge port of the powder tank truck is connected with the slotted powder feeding pipe, positive pressure gas is injected into the powder tank truck, and the slotted powder in the powder tank truck is sent to the first cyclone separator. After the first cyclone separator eliminates the wind speed existing in the slotted powder, the slotted powder falls into the slot powder feeding silo.
[0012] The Roots blower provides the transport wind force, and the speed of the rotary feeder is adjusted to transport the slotted powder to the mixing bin at a high place according to the demand. When entering the mixing bin, the speed of the slotted powder coming out of the climbing pipe is eliminated by the second cyclone separator, and finally the slotted powder enters the mixing bin.
[0013] The fine residual powder entering the mixing bin is first screened to remove particles smaller than 0.5 mm, and the slotted powder, fine residual powder and other anode raw materials are mixed in the mixing bin. The mixed material at the outlet of the mixing bin is controlled according to demand as the raw material for anode manufacturing.
[0014] After the fine residual powder is screened through a sieve with a mesh diameter of 0.5 mm, the weight of the fine residual powder raw material is reduced by 1.5%~2%. According to experimental analysis, 90% of the reduced weight of the fine residual powder raw material is ash.
[0015] Since 90% of the slotting powder particles are less than 0.5mm, they can just fill the gaps left by the fine residual powder screened out. The remaining slotting powder fills the gaps in the particle sizes of other raw materials. Therefore, after adding the slotting powder, not only does it not reduce the consumption of residual electrodes, but the quality of the manufactured anodes is also greatly improved.
[0016] After the inventors tested the amount of slotting powder added, they found that by adding slotting powder accounting for 2% to 2.5% of the total raw material, the volume, density and quality of the manufactured anode all met the requirements, and the ash content was reduced by 0.5%.
[0017] The advantage of this re-mixing system is that the slotting powder and the fine residual powder can be accurately mixed by the system, so that a certain amount of slotting powder can be added without reducing the amount of residual anodes, so that both the slotting powder and the residual anodes can be consumed.
[0018] The consumption of anode scraps is the same as that before slotting powder is added, so that the consumption and production of anode scraps and slotting powder are balanced, further solving the problem of excessive accumulation of anode slotting powder and anode scraps on site.
[0019] Preferably, the slotted powder feeding pipe is provided with a feeding head connected to the powder tanker, and the feeding head includes a blast pipe for introducing positive pressure gas into the powder tanker, and a suction pipe for absorbing the powder.
[0020] The slotted powder is connected to the powder tanker outlet through the punching head, and the slotted powder in the tanker is punched into the slotted powder feeding pipe.
[0021] Preferably, a slotted powder batcher is connected between the second cyclone separator and the slotted powder feed port, and a fine residual powder batcher is connected between the vibrating screen and the fine residual powder feed port. The sieved fine residual powder is passed into the fine residual powder batcher, and the slotted powder from the second cyclone separator is passed into the slotted powder batcher, and the output of the slotted powder batcher and the fine residual powder batcher are accurately distributed to achieve a preset ratio between the slotted powder and the fine residual powder.
[0022] Preferably, the three-way valve is a Y-type three-way valve with an angle between two inlets less than 60°. When the Y-type three-way valve with an angle is selected, when the Roots blower provides positive wind force, the slotted powder is evenly transported to the second cyclone separator.
[0023] Preferably, the slotted powder batcher discharge end and the fine residual powder batcher discharge end are both provided with a feed regulating valve for adjusting the ratio of the slotted powder to the fine residual powder. Through precise adjustment of the feed regulating valve, the slotted powder and the fine residual powder are distributed into the raw material according to a preset total weight.
[0024] Preferably, a radar level meter is provided on the inner wall of the mixing bin for observing the amount of material stored in the mixing bin. The amount of material in the mixing bin can be observed in an unmanned state through the radar level meter.
[0025] Preferably, the inlet of the vibrating screen is connected to a grinder for grinding coarser anode residues. Anode residues often have a larger particle size, and when fine residual powder is ground by the grinder and then screened, it is easier to remove ash.
[0026] Preferably, an inspection passage is provided in the mixing bin, and a ladder extending to the bottom of the mixing bin is provided in the inspection passage. When personnel are required to enter the mixing bin, the inspection personnel enter the mixing bin through the inspection passage.
[0027] Finally, the purification ports of the first cyclone separator and the second cyclone separator are both connected to a dust collector. The dust collector collects dust from the purification ports of the first and second cyclone separators to prevent the gas dust discharged by the two cyclone separators from drifting. The purification port here refers to the outlet in the middle of the cyclone separator that discharges clean gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 This is a schematic diagram of the structure of the anode slot powder re-distribution system for electrolytic aluminum roasting. DETAILED DESCRIPTION
[0029] The following is further described in detail through specific implementation methods: The figure numbers in the drawings of the specification are: slotted powder silo 1, first cyclone separator 2, punching head 3, rotary feeder 4, three-way pipe 5, Roots blower 6, second cyclone separator 7, grinder 8, fine residual powder batcher 9, mixer 10, mixing silo 11, conveyor belt 12, slotted powder batcher 13, climbing pipeline 14, vibrating screen 15.
[0030] like Figure 1 The electrolytic aluminum roasting anode slotted powder recycling system shown includes a mixing bin 11, a first cyclone separator 2 and a second cyclone separator 7. The feed port of the mixing bin 11 includes a fine residual powder feed port and a slotted powder feed port. The fine residual powder feed port is connected to a vibrating screen 15. The vibrating screen 15 is equipped with a sieve with a sieve hole diameter of 0.5 mm. The fine residual powder is first sieved to remove particles smaller than 0.5 mm in the fine residual powder, and the remaining fine residual powder is passed into the fine residual powder batcher 9.
[0031] The feed port of the first cyclone separator 2 is connected with a slotted powder feeding pipe, on which a feeding head 3 connected with the powder tanker is provided. The feeding head 3 includes a blast pipe for introducing positive pressure gas into the powder tanker and a suction pipe for absorbing the powder.
[0032] The outlet of the first cyclone separator 2 is connected to a slotted powder bin 1, and the outlet of the slotted powder bin 1 is connected to a variable frequency speed regulating rotary feeder 4, and the rotation speed of the rotary feeder 4 is controlled by the frequency converter.
[0033] The slotted powder is first sucked out from the powder tanker through the large material head, and the kinetic energy of the slotted powder is eliminated through the first cyclone separator. The slotted powder enters the slotted powder bin 1, and the slotted powder is then evenly fed into the climbing pipeline 14 through the rotary feeder 4. The kinetic energy of the slotted powder is eliminated again through the second cyclone separator 7 connected to the end of the climbing pipeline, and the slotted powder falls into the slotted powder batcher 13. After being batched by the slotted powder batcher 13, the slotted powder enters the mixing bin 11 to be mixed with the fine residual powder. A mixer 10 is provided in the mixing bin 11, and a conveyor belt 12 is provided below the outlet of the mixing bin 11. The conveyor belt 12 transports the mixed raw materials to the next process.
[0034] The outlet of the rotary feeder 4 is connected to a three-way valve 5, which is a Y-type three-way valve with an angle between two inlets less than 60°. The other inlet of the three-way valve 5 is connected to a Roots blower 6. The outlet of the three-way valve 5 is connected to the second cyclone separator 7 through a climbing pipe 14, and the second cyclone separator 7 is connected to the slotted powder feed port.
[0035] The purification ports of the first and second cyclone separators are both connected to the dust collector. The dust collector collects dust again from the purification ports of the first cyclone separator 2 and the second cyclone separator 7, ensuring that the gas discharged from the two cyclone separators does not contain dust.
[0036] A radar level meter is provided on the inner wall of the mixing bin 11 for observing the amount of material stored in the mixing bin. The amount of material in the mixing bin can be observed in an unmanned state through the radar level meter.
[0037] The inlet of the vibrating screen 15 is connected to a grinder 8 for grinding coarse residual anodes. Fine residual powder often has a larger particle size. After the fine residual powder is ground by the grinder 8, the performance of the produced anode is better.
[0038] An inspection passage is provided in the mixing bin 11, and a ladder extending to the bottom of the mixing bin is provided in the inspection passage. When personnel are required to enter the mixing bin 11, the inspection personnel enter the mixing bin through the inspection passage.
[0039] The slotting powder and the residual anode are both used as raw materials for the anode, and the specific implementation method of the recycling process is as follows: The anode slotting powder produced in the anode slotting workshop is transported to the slotting powder silo 1 by a powder tank truck. After the discharge port of the powder tank truck is connected to the slotting powder feeding pipe, positive pressure gas is injected into the powder tank truck, and the slotting powder in the powder tank truck is sent to the first cyclone separator 2. After the first cyclone separator 2 eliminates the wind speed of the slotting powder, the slotting powder falls into the slot powder feeding silo 1.
[0040] The Roots blower 6 provides transport wind force, and the speed of the rotary feeder 4 is adjusted to transport the slotted powder to the mixing bin 11 at a high place according to the demand. When entering the mixing bin 11, the speed of the slotted powder coming out of the climbing pipe 14 is eliminated by the second cyclone separator 7, and finally the slotted powder enters the mixing bin.
[0041] In addition, the fine residual powder entering the mixing bin 11 is first sieved to remove particles smaller than 0.5 mm in the fine residual powder, and the slotted powder, the fine residual powder and other anode raw materials are mixed in the mixing bin 11.
[0042] After measurement, it was found that more than 90% of the slotting powder particle size was below 0.5mm. Since the particles smaller than 0.5mm in the fine residual powder had been removed, during the mixing process of the fine residual powder, slotting powder and other anode raw materials in the mixing bin, the slotting powder could just fill the gaps screened out by the fine residual powder. Therefore, after adding the slotting powder, not only did the consumption of residual electrodes not be reduced, but the quality of the manufactured anodes was also greatly improved.
[0043] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. Anode slotting powder material re-mixing system for aluminum electrolysis roasting, comprising a mixing bin, a first cyclone separator and a second cyclone separator, characterized in that: The mixing bin feed port includes a fine residual powder feed port and a slotted powder feed port, the fine residual powder feed port is connected to a vibrating screen, the vibrating screen is equipped with a screen with a mesh diameter of 0.5 mm, the feed port of the first cyclone separator is connected to a slotted powder feeding pipe, the discharge port of the first cyclone separator is connected to a slotted powder bin, the outlet of the slotted powder bin is connected to a variable frequency speed regulating rotary feeder, the outlet of the rotary feeder is connected to a three-way valve, the other inlet of the three-way valve is connected to a Roots blower, the outlet of the three-way valve is connected to a second cyclone separator through a climbing pipeline, and the second cyclone separator is connected to the slotted powder feed port.
2. The electrolytic aluminum roasting anode slotting powder re-distribution system according to claim 1 is characterized by: The slotted powder punching pipe is provided with a punching head connected to the powder tanker, and the punching head includes a blast pipe for introducing positive pressure gas into the powder tanker and a suction pipe for absorbing the powder.
3. The electrolytic aluminum roasting anode slotting powder re-distribution system according to claim 2 is characterized by: A slotted powder batcher is connected between the second cyclone separator and the slotted powder feed port, and a fine residual powder batcher is connected between the vibrating screen and the fine residual powder feed port.
4. The electrolytic aluminum roasting anode slotting powder re-distribution system according to claim 3 is characterized by: The three-way valve is a Y-type three-way valve with an angle between two inlets less than 60°.
5. The electrolytic aluminum roasting anode slotting powder re-distribution system according to claim 4 is characterized by: A mixer is arranged in the mixing bin.
6. The electrolytic aluminum roasting anode slotting powder re-distribution system according to claim 5 is characterized by: A radar level meter is provided on the inner wall of the mixing bin to observe the material storage amount in the mixing bin.
7. The electrolytic aluminum roasting anode slotting powder re-distribution system according to claim 6 is characterized by: The inlet of the vibrating screen is connected to a grinder for grinding coarser residual poles.
8. The electrolytic aluminum roasting anode slotting powder re-distribution system according to claim 7, characterized in that: An inspection passage is provided in the mixing bin, and a ladder extending to the bottom of the mixing bin is provided in the inspection passage.
9. The electrolytic aluminum roasting anode slotting powder re-distribution system according to claim 8, characterized in that: The purification ports of the first cyclone separator and the second cyclone separator are both connected with dust collectors.