Accurate aluminum discharge control method for electrolytic cell
By obtaining the status data of the metal aluminum water at the bottom of the electrolytic cell, adjusting the current and decimation operations, the automatic and accurate aluminum output of the electrolytic cell is realized, solving the problem of low manual operation efficiency in the existing technology, and improving the aluminum output efficiency of the electrolytic cell and stability.
Patent Information
- Application Number
- CN202411314944.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2024-12-24
AI Technical Summary
In the existing electrolytic aluminum industry, the aluminum output operation of the electrolytic cell relies on manual labor and is inefficient, which cannot ensure the continuous and stable operation and rapid aluminum output inside the electrolytic cell.
By obtaining the first aggregation state data of the metal aluminum water at the bottom of the electrolytic cell, the inefficient area of the aluminum reduction electrolytic reaction is determined, the current application state and the aluminum outlet tube extraction operation are adjusted, and the switch state is controlled based on the extraction progress information to achieve automatic and accurate aluminum extraction.
The aluminum output efficiency of the electrolytic cell is improved, ensuring that the electrolytic cell continues to operate stably during normal operation, and avoiding the problem of inefficiency in manual operation.
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Figure CN119177477A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of aluminum electrolysis, and in particular to a precise aluminum discharge control method for an electrolytic cell. Background Art
[0002] The production of electrolytic aluminum mainly adopts the cryolite-alumina molten salt electrolysis method, which dissolves aluminum oxide into the electrolyte and applies a direct current to the electrolyte, so that the aluminum oxide will be reduced to liquid aluminum metal water and precipitate and gather at the bottom of the electrolytic cell. When the aluminum metal water precipitated and gathered at the bottom of the electrolytic cell reaches a certain height, it needs to be taken out from the inside of the electrolytic cell regularly to ensure the continuous and stable electrolytic reduction reaction inside the electrolytic cell. It can be seen that accurate aluminum tapping from the inside of the electrolytic cell has become an important step in the production of electrolytic aluminum industry. The existing aluminum tapping operation of the electrolytic cell is achieved through manual operation, which is inefficient and requires the operation of the electrolytic cell to be stopped to cooperate. It cannot ensure the complete and rapid aluminum tapping from the electrolytic cell and cannot ensure the continuous and stable operation of the inside of the electrolytic cell. Summary of the invention
[0003] In view of the defects of the prior art, the present invention provides a precise aluminum tapping control method for an electrolytic cell, which obtains and analyzes the first aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell during the cryolite-alumina molten salt electrolysis process, determines the inefficient area of the aluminum reduction electrolysis reaction inside the electrolytic cell, and adjusts the current application state inside the electrolytic cell; based on the second aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell after the current application state adjustment is completed, the extraction operation of the molten aluminum metal by the aluminum tapping tube connected to the bottom of the electrolytic cell is adjusted, the current application state inside the electrolytic cell is adjusted again and the second aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell is updated again, and based on the flow state of the molten aluminum metal inside the aluminum tapping tube, the heating state of the aluminum tapping tube is adjusted; based on the molten aluminum metal extraction progress information inside the electrolytic cell, the on / off state of the extraction operation is controlled, so that automatic and precise aluminum tapping operations can be performed during the normal and continuous operation of the electrolytic cell, thereby improving the aluminum tapping efficiency of the electrolytic cell.
[0004] The present invention provides a precise aluminum tapping control method for an electrolytic cell, comprising the following steps:
[0005] Step S1, obtaining first aggregation state data of metallic aluminum water at the bottom of the electrolytic cell during cryolite-alumina molten salt electrolysis; analyzing the first aggregation state data to determine an inefficient area of aluminum reduction electrolysis reaction inside the electrolytic cell;
[0006] Step S2, based on the inefficient area of the aluminum reduction electrolysis reaction, adjusting the current application state inside the electrolytic cell; obtaining the second aggregation state data of the molten aluminum at the bottom of the electrolytic cell after the current application state adjustment is completed, analyzing the second aggregation state data, and adjusting the extraction operation of the molten aluminum by the aluminum outlet tube connected to the bottom of the electrolytic cell;
[0007] Step S3, based on the extraction state of the molten aluminum at the bottom of the electrolytic cell by the extraction operation, the current application state inside the electrolytic cell is adjusted again and the second aggregation state data of the molten aluminum at the bottom of the electrolytic cell is updated again; based on the flow state of the molten aluminum inside the aluminum outlet tube, the heating state of the aluminum outlet tube is adjusted;
[0008] Step S4, analyzing the updated second aggregation state data, adjusting the action parameters of the extraction operation and determining the metal aluminum liquid extraction progress information inside the electrolytic cell; based on the metal aluminum liquid extraction progress information, controlling the switch state of the extraction operation.
[0009] In one embodiment disclosed in the present application, in the step S1, obtaining the first aggregation state data of the metallic aluminum water at the bottom of the electrolytic cell during the cryolite-alumina molten salt electrolysis process includes:
[0010] The distribution of the metallic aluminum water deposited at the bottom of the electrolytic cell during the cryolite-alumina molten salt electrolysis is detected to obtain the metallic aluminum water deposition rate data of all sub-areas under the global area at the bottom of the electrolytic cell, which is used as the first aggregation state data.
[0011] In one embodiment disclosed in the present application, in the step S1, analyzing the first aggregation state data to determine the inefficient area of aluminum reduction electrolysis reaction inside the electrolytic cell includes:
[0012] The metal aluminum water deposition rate data is analyzed to estimate the metal aluminum reduction generation rate of all sub-regions under the global region at the bottom of the electrolytic cell; the metal aluminum reduction generation rate is compared with a preset rate threshold; if the metal aluminum reduction generation rate is less than the preset rate threshold, it is determined that the corresponding sub-region belongs to an inefficient area for aluminum reduction electrolysis reaction; otherwise, it is determined that the corresponding sub-region does not belong to an inefficient area for aluminum reduction electrolysis reaction.
[0013] In one embodiment disclosed in the present application, in the step S2, based on the inefficient area of the aluminum reduction electrolysis reaction, adjusting the current application state inside the electrolytic cell includes:
[0014] Based on the position information of the inefficient area of the aluminum reduction electrolysis reaction inside the electrolytic cell, the intensity of the direct current applied to the corresponding position inside the electrolytic cell is increased.
[0015] In one embodiment disclosed in the present application, in the step S2, obtaining the second aggregation state data of the metallic aluminum liquid at the bottom of the electrolytic cell after the current application state adjustment is completed includes:
[0016] After the current application state adjustment is completed, the total weight change data of the metal aluminum water deposition in the global area at the bottom of the electrolytic cell is obtained as the second aggregation state data.
[0017] In one embodiment disclosed in the present application, in the step S2, the second aggregation state data is analyzed, and the extraction operation of the aluminum discharge pipe connected to the bottom of the electrolytic cell to the aluminum liquid is adjusted, including:
[0018] The total weight change data of the metallic aluminum water deposition is analyzed to determine whether the average height of the metallic aluminum water deposited at the bottom of the electrolytic cell exceeds a preset height threshold. If so, the negative pressure adsorption operation of the aluminum outlet pipe connected to the bottom of the electrolytic cell is started to extract the metallic aluminum water deposited at the bottom of the electrolytic cell.
[0019] In one embodiment disclosed in the present application, in the step S3, based on the extraction state of the metallic aluminum water at the bottom of the electrolytic cell by the extraction operation, the current application state inside the electrolytic cell is adjusted again and the second aggregation state data of the metallic aluminum water at the bottom of the electrolytic cell is updated again, including:
[0020] Based on the amount of molten aluminum extracted from all sub-areas under the global area of the bottom of the electrolytic cell during the extraction operation, the sub-area that allows the electrolysis reaction rate to be increased is identified, and the DC current intensity applied to the sub-area that allows the electrolysis reaction rate to be increased is increased again. At the same time, the total weight change data of the molten aluminum deposition in the global area of the bottom of the electrolytic cell is updated and obtained, which is used as the updated second aggregation state data.
[0021] In one embodiment disclosed in the present application, in the step S3, adjusting the heating state of the aluminum discharge tube based on the flow state of the molten aluminum inside the aluminum discharge tube includes:
[0022] Based on the flow velocity of the molten aluminum inside the aluminum outlet tube, determine whether a flow stagnation event occurs in the molten aluminum inside the aluminum outlet tube; if so, increase the heating temperature of the aluminum outlet tube; if not, keep the current heating temperature of the aluminum outlet tube unchanged.
[0023] In one embodiment disclosed in the present application, in the step S4, analyzing the updated second aggregation state data, adjusting the action parameters of the extraction operation, and determining the extraction progress information of the molten aluminum in the electrolytic cell include:
[0024] The updated data on the total weight change of molten aluminum deposits in the global area at the bottom of the electrolytic cell are analyzed, the negative pressure adsorption pressure corresponding to the extraction operation is adjusted, and the remaining molten aluminum accumulation height information after the molten aluminum inside the electrolytic cell is extracted is determined, which is used as the molten aluminum extraction progress information.
[0025] In one embodiment disclosed in the present application, in the step S4, based on the metal aluminum liquid extraction progress information, controlling the switch state of the extraction operation includes:
[0026] Based on the metal aluminum liquid accumulation height information, determine whether the metal aluminum liquid accumulation height inside the electrolytic cell is less than a preset height threshold. If so, stop the extraction operation; if not, maintain the current state of the extraction operation unchanged.
[0027] Compared with the prior art, the precise aluminum tapping control method for the electrolytic cell obtains and analyzes the first aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell during the cryolite-alumina molten salt electrolysis process, determines the inefficient area of the aluminum reduction electrolysis reaction inside the electrolytic cell, and adjusts the current application state inside the electrolytic cell; based on the second aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell after the current application state adjustment is completed, the extraction operation of the molten aluminum metal by the aluminum tapping tube connected to the bottom of the electrolytic cell is adjusted, the current application state inside the electrolytic cell is adjusted again and the second aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell is updated again, and based on the flow state of the molten aluminum metal inside the aluminum tapping tube, the heating state of the aluminum tapping tube is adjusted; based on the molten aluminum metal extraction progress information inside the electrolytic cell, the on / off state of the extraction operation is controlled, so that automatic and precise aluminum tapping operations can be performed during the normal and continuous operation of the electrolytic cell, thereby improving the aluminum tapping efficiency of the electrolytic cell.
[0028] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.
[0029] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0031] Figure 1 A schematic flow chart of the method for precise aluminum discharge control of an electrolytic cell provided by the present invention. DETAILED DESCRIPTION
[0032] 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.
[0033] See also Figure 1 , is a flow chart of a precise aluminum discharge control method for an electrolytic cell provided by an embodiment of the present invention. The precise aluminum discharge control method for an electrolytic cell comprises:
[0034] Step S1, obtaining first aggregation state data of metallic aluminum water at the bottom of the electrolytic cell during cryolite-alumina molten salt electrolysis; analyzing the first aggregation state data to determine an inefficient area of aluminum reduction electrolysis reaction inside the electrolytic cell;
[0035] Step S2, based on the inefficient area of aluminum reduction electrolysis reaction, adjusting the current application state inside the electrolytic cell; obtaining the second aggregation state data of the molten aluminum at the bottom of the electrolytic cell after the current application state adjustment is completed, analyzing the second aggregation state data, and adjusting the extraction operation of the molten aluminum by the aluminum outlet tube connected to the bottom of the electrolytic cell;
[0036] Step S3, based on the extraction state of the molten aluminum at the bottom of the electrolytic cell, the current application state inside the electrolytic cell is adjusted again and the second aggregation state data of the molten aluminum at the bottom of the electrolytic cell is updated again; based on the flow state of the molten aluminum inside the aluminum outlet tube, the heating state of the aluminum outlet tube is adjusted;
[0037] Step S4, analyzing the updated second aggregation state data, adjusting the action parameters of the extraction operation and determining the metal aluminum liquid extraction progress information inside the electrolytic cell; based on the metal aluminum liquid extraction progress information, controlling the switch state of the extraction operation.
[0038] The beneficial effects of the above technical solution are as follows: the precise aluminum tapping control method for the electrolytic cell acquires and analyzes the first aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell during the cryolite-alumina molten salt electrolysis process, determines the inefficient area of the aluminum reduction electrolysis reaction inside the electrolytic cell, and adjusts the current application state inside the electrolytic cell; based on the second aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell after the current application state adjustment is completed, adjusts the extraction operation of the molten aluminum metal by the aluminum tapping tube connected to the bottom of the electrolytic cell, adjusts the current application state inside the electrolytic cell again and updates the second aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell again, and adjusts the heating state of the aluminum tapping tube based on the flow state of the molten aluminum metal inside the aluminum tapping tube; based on the molten aluminum metal extraction progress information inside the electrolytic cell, controls the switch state of the extraction operation, and can perform automatic and precise aluminum tapping operations during the normal and continuous operation of the electrolytic cell, thereby improving the aluminum tapping efficiency of the electrolytic cell.
[0039] Preferably, in step S1, obtaining first aggregation state data of metallic aluminum water at the bottom of the electrolytic cell during cryolite-alumina molten salt electrolysis includes:
[0040] The distribution of the metallic aluminum water deposited at the bottom of the electrolytic cell during the cryolite-alumina molten salt electrolysis process is detected to obtain the metallic aluminum water deposition rate data of all sub-areas under the global area at the bottom of the electrolytic cell, which is used as the first aggregation state data.
[0041] The beneficial effect of the above technical solution is: when the cryolite-alumina molten salt electrolysis reaction is carried out inside the electrolytic cell, the liquid aluminum water generated by the electrolytic reduction reaction at the bottom of the electrolytic cell is distributed and detected, and the aluminum water deposition rate data of all sub-regions under the global area of the bottom of the electrolytic cell are obtained, that is, the deposition amount of aluminum water generated by electrolytic reduction in each sub-region per unit time, thereby comprehensively quantifying the generation of aluminum water in different sub-regions of the global area at the bottom of the electrolytic cell.
[0042] Preferably, in step S1, analyzing the first aggregation state data to determine the inefficient area of aluminum reduction electrolysis reaction inside the electrolytic cell includes:
[0043] The metal aluminum water deposition rate data is analyzed to estimate the metal aluminum reduction generation rate of all sub-regions under the global area at the bottom of the electrolytic cell; the metal aluminum reduction generation rate is compared with the preset rate threshold. If the metal aluminum reduction generation rate is less than the preset rate threshold, it is determined that the corresponding sub-region belongs to the inefficient area of aluminum reduction electrolysis reaction; otherwise, it is determined that the corresponding sub-region does not belong to the inefficient area of aluminum reduction electrolysis reaction.
[0044] The beneficial effects of the above technical solution are as follows: since the precipitation rate of metal aluminum water is positively correlated with the reduction generation rate of metal aluminum, the metal aluminum water deposition rate data is analyzed to estimate the metal aluminum reduction generation rate of all sub-regions under the global region at the bottom of the electrolytic cell, so that the electrolytic reduction reaction efficiency at different positions inside the electrolytic cell can be quantitatively characterized. In addition, the metal aluminum reduction generation rate is compared with the preset rate threshold, so that the inefficient reduction electrolytic reaction area inside the electrolytic cell can be quickly and accurately identified, which is convenient for subsequent targeted adjustment of the electrolytic reduction reaction conditions inside the electrolytic cell and improving the reduction reaction efficiency inside the electrolytic cell.
[0045] Preferably, in step S2, based on the inefficient area of aluminum reduction electrolysis reaction, adjusting the current application state inside the electrolytic cell includes:
[0046] Based on the position information of the inefficient area of aluminum reduction electrolysis reaction inside the electrolytic cell, the DC current intensity applied to the corresponding position inside the electrolytic cell is increased.
[0047] The beneficial effect of the above technical solution is: based on the position information of the inefficient area of aluminum reduction electrolysis reaction inside the electrolytic cell, the DC current intensity applied to the corresponding position inside the electrolytic cell is increased, so that the electrolytic reduction reaction conditions in the inefficient area of aluminum reduction electrolysis reaction inside the electrolytic cell can be improved, and the metallic aluminum water generation rate inside the electrolytic cell can be increased.
[0048] Preferably, in step S2, obtaining the second aggregation state data of the metallic aluminum liquid at the bottom of the electrolytic cell after the current application state adjustment is completed includes:
[0049] After the current application state adjustment is completed, the total weight change data of the metal aluminum water deposition in the global area at the bottom of the electrolytic cell is obtained as the second aggregation state data.
[0050] The beneficial effect of the above technical solution is that after the current application state adjustment is completed, the total weight change data of the metal aluminum liquid deposition in the global area at the bottom of the electrolytic cell is obtained, so that the weight of the metal aluminum liquid generated by the overall electrolytic reduction inside the electrolytic cell can be dynamically quantified and recorded.
[0051] Preferably, in step S2, the second aggregation state data is analyzed, and the extraction operation of the aluminum discharge pipe connected to the bottom of the electrolytic cell to extract the aluminum liquid is adjusted, including:
[0052] The total weight change data of metallic aluminum water deposition is analyzed to determine whether the average height of the metallic aluminum water deposited at the bottom of the electrolytic cell exceeds the preset height threshold. If so, the negative pressure adsorption operation of the aluminum outlet pipe connected to the bottom of the electrolytic cell is started to extract the metallic aluminum water deposited at the bottom of the electrolytic cell.
[0053] The beneficial effects of the above technical solution are: analyzing the total weight change data of metallic aluminum water deposition to determine whether the average height of the metallic aluminum water deposited at the bottom of the electrolytic cell exceeds the preset height threshold. When the average height of the metallic aluminum water deposited at the bottom of the electrolytic cell exceeds the preset height threshold, it indicates that the accumulation height of the metallic aluminum water generated by electrolytic reduction inside the electrolytic cell has affected the normal and continuous electrolytic reduction reaction inside the electrolytic cell. At this time, it is necessary to start the negative pressure adsorption operation of the aluminum outlet pipe connected to the bottom of the electrolytic cell, so as to extract the metallic aluminum water deposited at the bottom of the electrolytic cell, so as to timely perform the aluminum outlet operation on the electrolytic cell to avoid affecting the normal operation of the electrolytic cell.
[0054] Preferably, in step S3, based on the extraction state of the metallic aluminum water at the bottom of the electrolytic cell by the extraction operation, the current application state inside the electrolytic cell is adjusted again and the second aggregation state data of the metallic aluminum water at the bottom of the electrolytic cell is updated again, including:
[0055] Based on the extraction operation, the amount of molten aluminum extracted from all sub-areas under the global area at the bottom of the electrolytic cell is determined during the extraction process, and the sub-area that allows the electrolysis reaction rate to be increased is identified. The DC current intensity applied to the sub-area that allows the electrolysis reaction rate to be increased is increased again. At the same time, the total weight change data of the molten aluminum deposition in the global area at the bottom of the electrolytic cell is updated and obtained as the second aggregation state data that is updated and obtained.
[0056] The beneficial effects of the above technical solution are: obtaining the amount of metal aluminum water extracted from all sub-areas under the global area at the bottom of the electrolytic cell during the extraction operation of the metal aluminum water at the bottom of the electrolytic cell. If the amount of metal aluminum water extracted exceeds the preset volume threshold, it is determined that the corresponding sub-area belongs to the sub-area that allows the electrolytic reaction rate to be increased, and the DC current intensity applied to the sub-area that allows the electrolytic reaction rate to be increased is increased again, so that the electrolytic reduction reaction conditions of some sub-areas inside the electrolytic cell can be adjusted in a targeted manner to avoid the interruption of the electrolytic reduction reaction in the electrolytic cell. In addition, updating and obtaining the total weight change data of the metal aluminum water deposited in the global area at the bottom of the electrolytic cell can provide a reliable basis for the subsequent adjustment of the negative pressure adsorption pressure corresponding to the extraction operation.
[0057] Preferably, in step S3, based on the flow state of the molten aluminum inside the aluminum outlet tube, the heating state of the aluminum outlet tube is adjusted, including:
[0058] Based on the flow velocity of the molten aluminum inside the aluminum outlet tube, it is determined whether a flow stagnation event occurs in the molten aluminum inside the aluminum outlet tube; if so, the heating temperature of the aluminum outlet tube is increased; if not, the current heating temperature of the aluminum outlet tube is kept unchanged.
[0059] The beneficial effect of the above technical solution is: if the flow rate of the molten aluminum inside the aluminum outlet tube decreases, it indicates that the molten aluminum inside the aluminum outlet tube may cool and solidify and cause blockage inside the aluminum outlet tube. At this time, it is determined whether the molten aluminum inside the aluminum tube has a flow stagnation event. In order to avoid complete blockage inside the aluminum outlet tube, the heating temperature of the aluminum outlet tube is increased, which can improve the negative pressure adsorption efficiency of the aluminum outlet tube on the molten aluminum.
[0060] Preferably, in step S4, the updated second aggregation state data is analyzed, the action parameters of the extraction operation are adjusted, and the extraction progress information of the molten aluminum in the electrolytic cell is determined, including:
[0061] The updated data on the total weight change of molten aluminum deposition in the global area at the bottom of the electrolytic cell are analyzed, the negative pressure adsorption pressure corresponding to the extraction operation is adjusted, and the remaining molten aluminum accumulation height information after the molten aluminum inside the electrolytic cell is extracted is determined, which is used as the molten aluminum extraction progress information.
[0062] The beneficial effects of the above technical solution are: analyzing the updated data of the total weight change of the metal aluminum water deposition in the global area at the bottom of the electrolytic cell, judging whether the metal aluminum water in the global area at the bottom of the electrolytic cell has been completely extracted, and if so, reducing the negative pressure adsorption pressure corresponding to the extraction operation to avoid extracting the electrolyte inside the electrolytic cell. In addition, the information of the metal aluminum water accumulation height remaining after the metal aluminum water inside the electrolytic cell is extracted is determined, providing a reliable basis for the subsequent control of the switch state of the extraction operation.
[0063] Preferably, in step S4, based on the metal aluminum liquid extraction progress information, controlling the switch state of the extraction operation includes:
[0064] Based on the metal aluminum liquid accumulation height information, determine whether the metal aluminum liquid accumulation height inside the electrolytic cell is less than the preset height threshold. If so, stop the extraction operation; if not, maintain the current state of the extraction operation unchanged.
[0065] The beneficial effects of the above technical solution are: based on the metal aluminum liquid accumulation height information, it is determined whether the metal aluminum liquid accumulation height inside the electrolytic cell is less than the preset height threshold. If so, the extraction operation is stopped; if not, the current state of the extraction operation is maintained unchanged, so that automatic and precise aluminum discharge operations can be performed during the normal and continuous operation of the electrolytic cell, thereby improving the aluminum discharge efficiency of the electrolytic cell.
[0066] It can be seen from the contents of the above embodiments that the precise aluminum tapping control method for the electrolytic cell obtains and analyzes the first aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell during the cryolite-alumina molten salt electrolysis process, determines the inefficient area of the aluminum reduction electrolysis reaction inside the electrolytic cell, and adjusts the current application state inside the electrolytic cell; based on the second aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell after the current application state adjustment is completed, the extraction operation of the molten aluminum metal by the aluminum tapping tube connected to the bottom of the electrolytic cell is adjusted, the current application state inside the electrolytic cell is adjusted again and the second aggregation state data of the molten aluminum metal at the bottom of the electrolytic cell is updated again, and based on the flow state of the molten aluminum metal inside the aluminum tapping tube, the heating state of the aluminum tapping tube is adjusted; based on the molten aluminum metal extraction progress information inside the electrolytic cell, the switch state of the extraction operation is controlled, so that automatic and precise aluminum tapping operations can be performed during the normal and continuous operation of the electrolytic cell, thereby improving the aluminum tapping efficiency of the electrolytic cell.
[0067] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A precise aluminum discharge control method for an electrolytic cell, characterized in that: It includes the following steps: Step S1, obtaining first aggregation state data of metallic aluminum water at the bottom of the electrolytic cell during cryolite-alumina molten salt electrolysis; analyzing the first aggregation state data to determine an inefficient area of aluminum reduction electrolysis reaction inside the electrolytic cell; Step S2, adjusting the current application state inside the electrolytic cell based on the inefficient area of the aluminum reduction electrolysis reaction; Acquire the second aggregation state data of the molten aluminum at the bottom of the electrolytic cell after the current application state adjustment is completed, analyze the second aggregation state data, and adjust the extraction operation of the molten aluminum by the aluminum outlet pipe connected to the bottom of the electrolytic cell; Step S3, based on the extraction state of the molten aluminum at the bottom of the electrolytic cell by the extraction operation, the current application state inside the electrolytic cell is adjusted again and the second aggregation state data of the molten aluminum at the bottom of the electrolytic cell is updated again; based on the flow state of the molten aluminum inside the aluminum outlet tube, the heating state of the aluminum outlet tube is adjusted; Step S4, analyzing the updated second aggregation state data, adjusting the action parameters of the extraction operation and determining the metal aluminum liquid extraction progress information inside the electrolytic cell; based on the metal aluminum liquid extraction progress information, controlling the switch state of the extraction operation.
2. The precise aluminum discharge control method for an electrolytic cell according to claim 1, characterized in that: In the step S1, the first aggregation state data of the metallic aluminum water at the bottom of the electrolytic cell during the cryolite-alumina molten salt electrolysis is obtained, including: The distribution of the metallic aluminum water deposited at the bottom of the electrolytic cell during the cryolite-alumina molten salt electrolysis is detected to obtain the metallic aluminum water deposition rate data of all sub-areas under the global area at the bottom of the electrolytic cell, which is used as the first aggregation state data.
3. The precise aluminum discharge control method for an electrolytic cell according to claim 2, characterized in that: In the step S1, analyzing the first aggregation state data to determine the inefficient area of aluminum reduction electrolysis reaction inside the electrolytic cell includes: The metal aluminum water deposition rate data is analyzed to estimate the metal aluminum reduction generation rate of all sub-regions under the global region at the bottom of the electrolytic cell; the metal aluminum reduction generation rate is compared with a preset rate threshold; if the metal aluminum reduction generation rate is less than the preset rate threshold, it is determined that the corresponding sub-region belongs to an inefficient area for aluminum reduction electrolysis reaction; otherwise, it is determined that the corresponding sub-region does not belong to an inefficient area for aluminum reduction electrolysis reaction.
4. The precise aluminum discharge control method for an electrolytic cell according to claim 3, characterized in that: In the step S2, based on the inefficient region of the aluminum reduction electrolysis reaction, adjusting the current application state inside the electrolytic cell includes: Based on the position information of the inefficient area of the aluminum reduction electrolysis reaction inside the electrolytic cell, the intensity of the direct current applied to the corresponding position inside the electrolytic cell is increased.
5. The precise aluminum tapping control method for an electrolytic cell according to claim 4, characterized in that: In the step S2, obtaining the second aggregation state data of the metallic aluminum liquid at the bottom of the electrolytic cell after the current application state adjustment is completed includes: After the current application state adjustment is completed, the total weight change data of the metal aluminum water deposition in the global area at the bottom of the electrolytic cell is obtained as the second aggregation state data.
6. The precise aluminum discharge control method for an electrolytic cell according to claim 5, characterized in that: In the step S2, the second aggregation state data is analyzed, and the extraction operation of the aluminum discharge pipe connected to the bottom of the electrolytic cell to extract the aluminum liquid is adjusted, including: The total weight change data of the metallic aluminum water deposition is analyzed to determine whether the average height of the metallic aluminum water deposited at the bottom of the electrolytic cell exceeds a preset height threshold. If so, the negative pressure adsorption operation of the aluminum outlet pipe connected to the bottom of the electrolytic cell is started to extract the metallic aluminum water deposited at the bottom of the electrolytic cell.
7. The precise aluminum discharge control method for an electrolytic cell according to claim 6, characterized in that: In the step S3, based on the extraction state of the metallic aluminum water at the bottom of the electrolytic cell by the extraction operation, the current application state inside the electrolytic cell is adjusted again and the second aggregation state data of the metallic aluminum water at the bottom of the electrolytic cell is updated again, including: Based on the amount of molten aluminum extracted from all sub-areas under the global area of the bottom of the electrolytic cell during the extraction operation, the sub-area that allows the electrolysis reaction rate to be increased is identified, and the DC current intensity applied to the sub-area that allows the electrolysis reaction rate to be increased is increased again. At the same time, the total weight change data of the molten aluminum deposition in the global area of the bottom of the electrolytic cell is updated and obtained, which is used as the updated second aggregation state data.
8. The precise aluminum discharge control method for an electrolytic cell according to claim 7, characterized in that: In the step S3, based on the flow state of the molten aluminum inside the aluminum outlet tube, the heating state of the aluminum outlet tube is adjusted, including: Based on the flow velocity of the molten aluminum inside the aluminum outlet tube, determine whether a flow stagnation event occurs in the molten aluminum inside the aluminum outlet tube; if so, increase the heating temperature of the aluminum outlet tube; if not, keep the current heating temperature of the aluminum outlet tube unchanged.
9. The precise aluminum discharge control method for an electrolytic cell according to claim 8, characterized in that: In the step S4, the updated second aggregation state data is analyzed, the action parameters of the extraction operation are adjusted, and the extraction progress information of the molten aluminum in the electrolytic cell is determined, including: The updated data on the total weight change of molten aluminum deposits in the global area at the bottom of the electrolytic cell are analyzed, the negative pressure adsorption pressure corresponding to the extraction operation is adjusted, and the remaining molten aluminum accumulation height information after the molten aluminum inside the electrolytic cell is extracted is determined, which is used as the molten aluminum extraction progress information.
10. The precise aluminum tapping control method for an electrolytic cell according to claim 9, characterized in that: In the step S4, based on the metal aluminum liquid extraction progress information, the switch state of the extraction operation is controlled, including: Based on the metal aluminum liquid accumulation height information, determine whether the metal aluminum liquid accumulation height inside the electrolytic cell is less than a preset height threshold. If so, stop the extraction operation; if not, maintain the current state of the extraction operation unchanged.