Zinc removal device for electrolytic aluminum liquid, vacuum ladle and zinc removal method for electrolytic aluminum liquid

Abstract

This invention belongs to the field of electrolytic aluminum technology, specifically relating to a zinc removal device, vacuum ladle lifting mechanism, and zinc removal method for electrolytic aluminum liquid. The zinc removal device includes: a collection assembly comprising a base and a collection tube; the base has a receiving groove and is located within the ladle body; the collection tube is located within the receiving groove and inside the ladle cover, and is connected to both the ladle body and the ladle cover; and a condensation assembly comprising a condenser, an inlet pipe, an outlet pipe, and a condensing pipe; one end of the inlet pipe is connected to the condenser, and the other end passes through the ladle cover and is connected to the condensing pipe; the outlet pipe is connected to one end of the condenser, and the other end passes through the ladle cover and is connected to the condensing pipe; the condensing pipe is located on the inner wall of the ladle cover. This zinc removal device, vacuum ladle lifting mechanism, and zinc removal method for electrolytic aluminum liquid can remove zinc from electrolytic aluminum liquid.

Description

Technical Field

[0001] This application belongs to the field of electrolytic aluminum technology, specifically relating to a zinc removal device for electrolytic aluminum liquid, a vacuum lifting ladle, and a zinc removal method for electrolytic aluminum liquid. Background Technology

[0002] The primary aluminum produced in electrolytic cells varies in quality and contains various impurities, including metallic elements, non-metallic solid inclusions, and gases. During aluminum electrolysis, zinc impurities primarily originate from the alumina raw material, which is one of the main pathways for zinc to enter the molten aluminum. Bauxite itself may contain trace amounts of zinc (usually in the form of zinc oxides, sulfides, or silicates). In the Bayer process or sintering process for alumina production, most impurities are removed, but zinc, due to its chemical properties, is difficult to completely remove. If the bauxite used has a high zinc content, or if the alumina production process is not efficient enough in removing zinc, the finished alumina will contain a certain amount of zinc oxide (ZnO).

[0003] During electrolysis, ZnO is reduced to metallic zinc and dissolved in molten aluminum. The presence of zinc in aluminum ingots significantly affects the properties and characteristics of aluminum, reducing its oxidation resistance and chemical stability, increasing its risk of corrosion and oxidation, and causing changes in interfacial tension, thus affecting its liquid and solid flowability, which can impact production. In some cases, zinc in aluminum ingots can lead to bubbles and surface defects, reducing production efficiency and quality. Furthermore, if the zinc content in aluminum ingots exceeds a certain limit, it can reduce its toughness and make it more brittle. In addition, during the manufacturing and application of aluminum, zinc can react with other materials, leading to metal miscibility or the formation of unstable compounds, reducing product reliability.

[0004] The presence of zinc in aluminum ingots significantly impacts their properties and characteristics, affecting the stability and reliability of production and use. However, some technologies use alumina with high zinc content, leading to excessive zinc levels in the aluminum ingots and negatively impacting their quality. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an electrolytic aluminum liquid zinc removal device, a vacuum ladle lifting system, and an electrolytic aluminum liquid zinc removal method. The aim is to at least partially solve the technical problem of excessive zinc content in aluminum ingots caused by the use of alumina with high zinc content, thus affecting the quality of the aluminum ingots.

[0006] The technical solution of this invention is as follows: An electrolytic aluminum liquid zinc removal device includes: a collection assembly comprising a base and a collection pipe, the base having a receiving groove and being disposed on a ladle body, the collection pipe being disposed within the receiving groove and located inside a ladle cover, the collection pipe being connected to the ladle body and the ladle cover; and a condensation assembly comprising a condenser, an inlet pipe, an outlet pipe, and a condensing pipe, one end of the inlet pipe being connected to the condenser and the other end passing through the ladle cover and connecting to the condensing pipe, the outlet pipe being connected to the condenser at one end and the other end passing through the ladle cover and connecting to the condensing pipe, the condensing pipe being disposed on the inner wall of the ladle cover.

[0007] In some embodiments, the collection tube has a collection channel with an air inlet and an air outlet; wherein the package body is connected to the air inlet and the package cover is connected to the air outlet.

[0008] In some implementations, the diameter of the collection channel gradually decreases along the direction from the package body toward the cover.

[0009] In some embodiments, the package has a package opening, the air inlet is connected to the package opening, and the diameter of the air inlet is the same as the diameter of the package opening.

[0010] In some embodiments, the collection assembly further includes a sealing plate connected to the collection channel and disposed at the air outlet; wherein the sealing plate has at least one vent hole.

[0011] In some implementations, the depth of the receiving groove is 3cm to 6cm.

[0012] In some implementations, the condenser tube is spiral-shaped.

[0013] Based on the same inventive concept, this application also provides a vacuum lifting bag, including a bag body, a bag cover, and the aforementioned electrolytic aluminum liquid zinc removal device, wherein the bag body is detachably connected to the bag cover.

[0014] Based on the same inventive concept, this application also provides a method for removing zinc from molten aluminum. Based on the aforementioned device for removing zinc from molten aluminum, the method includes the following steps: placing a base on a package body, with a collection pipe connected to the package body and a cover; connecting the cover to the package body to form a vacuum lift; evacuating the vacuum lift to create a vacuum state; heating the molten aluminum inside the package to 930℃~980℃ and maintaining this temperature for 0.5h~1h to vaporize the zinc in the molten aluminum, forming zinc vapor; the zinc vapor entering the cover through the collection pipe; a condenser supplying a condensing medium to the condensing pipe through the inlet pipe to condense the zinc vapor inside the cover, forming molten zinc, which falls into a receiving tank; and an outlet pipe supplying the condensing medium, after heat exchange with the zinc vapor, to the condenser.

[0015] In some embodiments, the method for removing zinc from molten aluminum further includes: when the vacuum ladle is transported and transferred to the holding furnace, maintaining the vacuum ladle in a vacuum state for 0.25h to 1h, and maintaining the temperature of the ladle body at 930℃ to 980℃.

[0016] The beneficial effects of the present invention include at least the following: The collecting assembly includes a base and a collecting tube. The base has a receiving groove and is located within the package body. The collecting tube is located within the receiving groove and inside the package cover, communicating with both the package body and the package cover. The condensing assembly includes a condenser, an inlet pipe, an outlet pipe, and a condensing tube. One end of the inlet pipe is connected to the condenser, and the other end passes through the package cover and communicates with the condensing tube. The outlet pipe is connected to one end of the condenser and the other end passes through the package cover and communicates with the condensing tube. The condensing tube is located on the inner wall of the package cover. Therefore, when collecting zinc from the aluminum electrolyte, the molten aluminum inside the package is heated to 930℃~980℃, causing the zinc in the molten aluminum to vaporize. Zinc vapor is formed. At this temperature, the electrolytic aluminum liquid does not vaporize. The zinc vapor enters the ladle cover through the collection pipe. The condenser delivers a condensing medium to the condensing pipe through the liquid inlet pipe to condense the zinc vapor in the ladle cover to form zinc liquid. The zinc liquid falls into the receiving tank. The liquid outlet pipe delivers the condensing medium, which has exchanged heat with the zinc vapor, to the condenser. The receiving tank contains the zinc liquid, which can remove zinc from the electrolytic aluminum liquid, prevent the zinc content in the aluminum ingot from exceeding the standard, and ensure the quality of the aluminum ingot. Moreover, no chemical reagents need to be added, and no wastewater or waste materials are generated to pollute the environment, thus achieving environmental protection. At the same time, it can also collect high-purity metallic zinc. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the collection component of the zinc removal device for electrolytic aluminum liquid according to some embodiments; Figure 2 This is a schematic diagram showing the arrangement of the condensation components in an electrolytic aluminum liquid zinc removal device according to some embodiments.

[0019] In the attached image: Collection component 10, base 11, collection tube 12, receiving slot 13; Condensation assembly 20, liquid inlet pipe 21, liquid outlet pipe 22, condenser pipe 23; 30 for the cap. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0024] Specific technical solutions will now be described in detail with reference to the accompanying drawings, which are not necessarily drawn to scale. Similar or identical reference numerals may be used to designate the same or similar parts in different figures. The use of similar or identical reference numerals in different figures does not mean that all figures including similar or identical reference numerals constitute a single or the same embodiment. The accompanying drawings illustrate the various embodiments discussed in this application in a generalized, illustrative, and not restrictive manner.

[0025] Combination Figure 1 and Figure 2 The zinc removal device for electrolytic aluminum liquid in this embodiment includes a collection assembly 10 and a condensation assembly 20. The collection assembly 10 includes a base 11 and a collection pipe 12. The base 11 has a receiving groove 13 and is located within the package body. The collection pipe 12 is located within the receiving groove 13 and within the package cover 30, and is connected to both the package body and the package cover 30. The condensation assembly 20 includes a condenser, an inlet pipe 21, an outlet pipe 22, and a condenser pipe 23. One end of the inlet pipe 21 is connected to the condenser, and the other end passes through the package cover 30 and is connected to the condenser pipe 23. The outlet pipe 22 is connected to one end of the condenser and the other end passes through the package cover 30 and is connected to the condenser pipe 23. The condenser pipe 23 is located on the inner wall of the package cover 30.

[0026] The liquid inlet pipe 21, liquid outlet pipe 22 and condenser pipe 23 can be made of one or more of the following materials: 316 stainless steel, 316L stainless steel, 904L stainless steel, copper pipe, Hastelloy, Monel alloy.

[0027] The material of the collecting component 10 can be one or more of the following: ductile iron, high-strength cast iron, austenitic stainless steel, nickel-based alloy, silicon carbide ceramic material, and coated steel.

[0028] Since the collecting assembly 10 includes a base 11 and a collecting pipe 12, the base 11 has a receiving groove 13 and is located in the package body. The collecting pipe 12 is located in the receiving groove 13 and inside the package cover 30. The collecting pipe 12 is connected to the package body and the package cover 30. The condensing assembly 20 includes a condenser, an inlet pipe 21, an outlet pipe 22, and a condensing pipe 23. One end of the inlet pipe 21 is connected to the condenser, and the other end passes through the package cover 30 and is connected to the condensing pipe 23. The outlet pipe 22 is connected to the condenser at one end, and the other end passes through the package cover 30 and is connected to the condensing pipe 23. The condensing pipe 23 is located on the inner wall of the package cover 30. Therefore, when collecting zinc from the aluminum electrolyte, the electrolytic aluminum liquid in the package body is heated to 930℃~98℃. At 0℃, the zinc in the electrolytic aluminum liquid vaporizes to form zinc vapor. At this temperature, the electrolytic aluminum liquid does not vaporize. The zinc vapor enters the cover 30 through the collection pipe 12. The condenser delivers the condensing medium to the condensing pipe 23 through the liquid inlet pipe 21 to condense the zinc vapor in the cover 30 to form zinc liquid. The zinc liquid falls into the receiving tank 13. The liquid outlet pipe 22 delivers the condensing medium after heat exchange with the zinc vapor to the condenser. The receiving tank 13 contains the zinc liquid, which can remove zinc from the electrolytic aluminum liquid, prevent the zinc content in the aluminum ingot from exceeding the standard, and ensure the quality of the aluminum ingot. Moreover, no chemical reagents are needed, and no wastewater or waste is generated, which pollutes the environment and is environmentally friendly. At the same time, it can also collect high-purity metallic zinc.

[0029] Combination Figure 2 In some embodiments, the outlet pipe 22 is located above the inlet pipe 21 to facilitate the flow of the condensing medium.

[0030] Combination Figure 1 In some embodiments, to allow zinc vapor to enter the cover 30, the collection pipe 12 has a collection channel with an inlet and an outlet. The bag body is connected to the inlet, and the cover 30 is connected to the outlet. Zinc vapor inside the bag enters the collection channel through the inlet and enters the cover 30 through the outlet.

[0031] Combination Figure 1 In some embodiments, the diameter of the collection channel gradually decreases along the direction from the package body toward the cover 30. After the zinc vapor condenses to form liquid zinc, the liquid zinc is prevented from returning to the package body, reducing the possibility of backflow and improving the zinc removal efficiency.

[0032] In some embodiments, the package has a package opening and an air inlet connected to the package opening. Zinc vapor inside the package can enter the air inlet through the package opening, and the diameter of the air inlet is the same as the diameter of the package opening, so that the zinc vapor inside the package can fully enter the air inlet through the package opening.

[0033] In some embodiments, to prevent molten zinc from returning to the bag, the collection assembly 10 further includes a sealing plate. The sealing plate is connected to the collection channel and is located at the vent. The sealing plate has at least one vent hole that connects the bag cover 30 and the collection channel. Exemplarily, the number of vent holes can be one or more.

[0034] Zinc vapor enters the bag cover 30 through the vent. Under the action of the condenser tube 23, the zinc vapor condenses into zinc liquid. The vent prevents the zinc liquid from returning to the bag, reducing the possibility of backflow and improving the zinc removal efficiency.

[0035] In some embodiments, the depth of the receiving tank 13 is 3cm to 6cm, so that the zinc liquid is blocked by the tank wall during the pouring of electrolytic aluminum liquid, thus preventing the zinc liquid from being poured out.

[0036] Combination Figure 2 In some embodiments, the condenser tube 23 is spiral-shaped to ensure that the condenser tube 23 can fully exchange heat with the zinc vapor inside the cover 30, so that the zinc vapor can condense to form liquid zinc.

[0037] Based on the same inventive concept, this application also provides a vacuum lifting bag, which adopts the electrolytic aluminum liquid zinc removal device. The specific structure of the electrolytic aluminum liquid zinc removal device is as described in the above embodiments. Since the electrolytic aluminum liquid zinc removal device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0038] In some embodiments, the vacuum lifting bag includes a bag body and a bag cover 30. The bag body is detachably connected to the bag cover 30. When it is time to remove the molten zinc from the receiving tank 13, the bag cover 30 is removed from the bag body, and the base 11 is taken out to collect the molten zinc in the receiving tank 13.

[0039] Based on the same inventive concept, this application also provides a method for removing zinc from electrolytic aluminum liquid. Based on the aforementioned electrolytic aluminum liquid zinc removal device, the method for removing zinc from electrolytic aluminum liquid includes the following steps: The base 11 is placed on the package body, and the collection tube 12 is connected to the package body and the package cover 30.

[0040] Connect the cap 30 to the bag body to form a vacuum lifting bag.

[0041] The vacuum pack is evacuated to ensure it is in a vacuum state.

[0042] The molten aluminum inside the package is heated to 930℃~980℃ and maintained for 0.5h~1h to allow the zinc in the molten aluminum to vaporize and form zinc vapor.

[0043] Zinc vapor enters the cladding cover 30 through the collection pipe 12.

[0044] The condenser delivers condensing medium to the condensing tube 23 through the liquid inlet pipe 21, condensing the zinc vapor inside the cover 30 to form liquid zinc. The liquid zinc falls into the receiving tank 13, which can remove zinc from the electrolytic aluminum liquid, prevent the zinc content in the aluminum ingot from exceeding the standard, and ensure the quality of the aluminum ingot. Moreover, no chemical reagents need to be added, and no wastewater or waste materials are generated to pollute the environment, thus achieving environmental protection. At the same time, it can also collect high-purity metallic zinc.

[0045] The outlet pipe 22 delivers the condensate, after heat exchange with zinc vapor, to the condenser. For example, the condensate can be condensate water.

[0046] In some embodiments, the method for removing zinc from molten aluminum further includes: When the vacuum ladle is transported to the holding furnace, it is kept in a vacuum state for 0.25h to 1h, and the temperature of the ladle is maintained at 930℃ to 980℃. This allows the zinc in the electrolytic aluminum liquid to continue to vaporize, further reducing and removing zinc from the electrolytic aluminum liquid, preventing the zinc content in the aluminum ingot from exceeding the standard, and ensuring the quality of the aluminum ingot.

[0047] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0050] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0051] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A zinc removal device for electrolytic aluminum liquid, characterized in that, include: A collection component includes a base and a collection tube. The base has a receiving groove and is disposed in the bag body. The collection tube is disposed in the receiving groove and located inside the bag cover. The collection tube communicates with the bag body and the bag cover. A condensation assembly includes a condenser, an inlet pipe, an outlet pipe, and a condenser tube. One end of the inlet pipe is connected to the condenser, and the other end passes through the cover and is connected to the condenser tube. The outlet pipe is connected to the condenser at one end and passes through the cover and is connected to the condenser tube at the other end. The condenser tube is located on the inner wall of the cover.

2. The zinc removal device for electrolytic aluminum liquid according to claim 1, characterized in that, The collection tube has a collection channel, and the collection channel has an air inlet and an air outlet; The package body is connected to the air inlet, and the package cover is connected to the air outlet.

3. The zinc removal device for electrolytic aluminum liquid according to claim 2, characterized in that, The diameter of the collection channel gradually decreases along the direction from the package body toward the cover.

4. The zinc removal device for electrolytic aluminum liquid according to claim 2, characterized in that, The package has a package opening, and the air inlet is connected to the package opening, with the diameter of the air inlet matching the diameter of the package opening.

5. The zinc removal device for electrolytic aluminum liquid according to claim 2, characterized in that, The collection component also includes: A sealing plate is connected to the collection channel and is located at the air outlet; The sealing plate has at least one vent hole.

6. The zinc removal apparatus for electrolytic aluminum liquid according to any one of claims 1-5, characterized in that, The depth of the receiving groove is 3cm to 6cm.

7. The zinc removal apparatus for electrolytic aluminum liquid according to any one of claims 1-5, characterized in that, The condenser tube is spiral-shaped.

8. A vacuum lifting package, characterized in that, The device includes a package body, a cover, and an electrolytic aluminum liquid zinc removal apparatus as described in any one of claims 1-7, wherein the package body is detachably connected to the cover.

9. A method for removing zinc from electrolytic aluminum liquid, characterized in that, Based on the zinc removal apparatus for electrolytic aluminum liquid according to any one of claims 1-7, the zinc removal method for electrolytic aluminum liquid includes the following steps: The base is placed on the package body, and the collection tube is connected to the package body and the package cover; The cap is connected to the body of the bag to form a vacuum-lifted bag; The vacuum lifting package is evacuated to bring it into a vacuum state. The electrolytic aluminum liquid inside the package is heated to 930℃~980℃ and maintained for 0.5h~1h, so that the zinc in the electrolytic aluminum liquid is vaporized to form zinc vapor; The zinc vapor enters the bladder cover through the collection pipe; The condenser delivers a condensing medium to the condensing tube through the inlet pipe to condense the zinc vapor inside the cover to form liquid zinc, which then falls into the receiving tank. The outlet pipe delivers the condensed medium, which has undergone heat exchange with zinc vapor, to the condenser.

10. The method for removing zinc from electrolytic aluminum liquid according to claim 9, characterized in that, The method for removing zinc from electrolytic aluminum liquid also includes: When the vacuum bag is transported and transferred to the holding furnace, the vacuum bag is kept in a vacuum state for 0.25h to 1h, and the temperature of the vacuum bag is maintained at 930℃ to 980℃.

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