A prebaked anode for aluminum electrolysis and preparation method thereof

Abstract

The present invention provides a prebaked anode for aluminum electrolysis and a preparation method thereof, which belongs to the technical field of aluminum electrolysis. The prebaked anode for aluminum electrolysis consists of a first anode terminal and a second anode terminal; the raw materials of the first anode terminal include: petroleum coke for the first anode terminal; the raw materials of the second anode terminal include: petroleum coke products for the second anode terminal; the quality of the petroleum coke for the first anode terminal is better than the quality of the petroleum coke products for the second anode terminal. Under the premise of ensuring the excellent working performance of the prebaked anode, the inferior petroleum coke and other petroleum coke substitutes are efficiently utilized, the utilization rate of high-quality petroleum coke is improved, the production cost of high-quality carbon anodes is reduced, and high-quality resources are saved, which effectively solves the technical problem of high production cost of the existing prebaked anodes for aluminum electrolysis.

Description

Technical Field

[0001] The present application relates to the technical field of aluminum electrolysis, and in particular to a prebaked anode for aluminum electrolysis and a preparation method thereof. Background Art

[0002] Carbon prebaked anodes are made of coke particles as aggregate and coal tar as binder. They are kneaded, formed and baked according to a certain formula. They are an important component of prebaked aluminum electrolytic cells. Petroleum coke accounts for about 85% of the mass of carbon anodes and about 60% of the anode production cost.

[0003] With the depletion of resources, the surge in imported crude oil, and the promotion and application of new refining processes by petrochemical companies, the quality of petroleum coke has deteriorated year by year, and the sulfur content, impurity content and powder content have gradually increased, making the gap in high-quality petroleum coke larger and the price higher, resulting in an increase in the cost of carbon anodes year by year. Summary of the invention

[0004] The embodiments of the present application provide a prebaked anode for aluminum electrolysis and a preparation method thereof to solve the technical problem of high production cost of the existing prebaked anode for aluminum electrolysis.

[0005] In a first aspect, an embodiment of the present application provides a prebaked anode for aluminum electrolysis, wherein the prebaked anode for aluminum electrolysis is composed of a first anode terminal and a second anode terminal;

[0006] The raw materials of the first anode terminal include: petroleum coke for the first anode terminal;

[0007] The raw materials of the second anode end include: petroleum coke products for the second anode end;

[0008] The quality of the petroleum coke used at the first anode end is better than the quality of the petroleum coke products used at the second anode end.

[0009] Furthermore, the quality classification standard number of the first anode end petroleum coke includes at least one of No. 1, 2A, 2B, 2C, 3A, 3B, 3C, 4A and 4B.

[0010] Furthermore, the second anode end petroleum coke product includes at least one of a second petroleum coke and a petroleum coke substitute, and the quality classification standard number of the second petroleum coke includes at least one of 2A, 2B, 2C, 3A, 3B, 3C, 4A, 4B, No. 5 and No. 6.

[0011] Furthermore, the petroleum coke substitute includes at least one of low-ash coal, lignite, high-sulfur coke and asphalt coke.

[0012] Furthermore, the height H of the first anode terminal is 1 , the height H of the second anode terminal 2 , the height H of the prebaked anode residue3 and the overall height H of the prebaked anode for aluminum electrolysis 0 The relationship satisfies:

[0013] H 1 +H 2 =H 0 ;as well as

[0014] H 3 –H 2 =△H;

[0015] Wherein, ΔH represents the height H of the prebaked anode residues. 3 Subtract the height H of the second anode terminal 2 Value; △H>0mm.

[0016] Furthermore, the ΔH satisfies: 5mm≤ΔH≤50mm.

[0017] Furthermore, the height H of the prebaked anode residue is 3 It is 120mm~170mm.

[0018] Furthermore, the raw material of the first anode terminal also includes: an adhesive.

[0019] Furthermore, the raw material of the second anode terminal also includes: an adhesive.

[0020] In a second aspect, an embodiment of the present application provides a method for preparing a prebaked anode for aluminum electrolysis according to the first aspect, the preparation method comprising:

[0021] Mixing the raw materials of the first anode terminal to obtain a first mixed material;

[0022] Mixing the raw materials of the second anode terminal components to obtain a second mixed material;

[0023] Placing the first mixed material and the second mixed material into a forming mold in sequence, and then vibrating and forming the mold to obtain an anode green body;

[0024] The anode green body is calcined to obtain a prebaked anode for aluminum electrolysis.

[0025] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0026] The embodiment of the present application provides a prebaked anode for aluminum electrolysis, specifically a carbon anode for aluminum electrolysis that can save resources, and the prebaked anode for aluminum electrolysis is composed of a first anode terminal and a second anode terminal. On the one hand, by selecting a second anode terminal made of low-cost raw materials such as inferior petroleum coke and other petroleum coke substitutes to make the second anode terminal, the available resources for producing carbon anodes are expanded; on the other hand, by selecting a first anode terminal made of petroleum coke with higher quality to make the first anode terminal, as the lower part of the anode that participates in the electrolysis reaction and is consumed. Therefore. Under the premise of ensuring the excellent working performance of the prebaked anode, inferior petroleum coke and other petroleum coke substitutes are efficiently utilized, the utilization rate of high-quality petroleum coke is improved, the production cost of high-quality carbon anodes is reduced, and high-quality resources are saved, which effectively solves the technical problem of high production cost of existing prebaked anodes for aluminum electrolysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0028] 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 A schematic flow chart of a method for preparing a prebaked anode for aluminum electrolysis provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below in conjunction with specific implementations and examples, and the advantages and various effects of the present invention will be more clearly presented. It should be understood by those skilled in the art that these specific implementations and examples are for illustrating the present invention, rather than limiting the present invention.

[0031] Throughout the specification, unless otherwise specifically stated, the terms used herein should be understood as meanings commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. In the event of a conflict, the present specification takes precedence.

[0032] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0033] Carbon prebaked anodes are made of coke particles as aggregate and coal tar as binder. They are kneaded, formed and baked according to a certain formula. They are an important component of prebaked aluminum electrolytic cells. Petroleum coke accounts for about 85% of the mass of carbon anodes and about 60% of the anode production cost.

[0034] With the depletion of resources, the surge in imported crude oil, and the promotion and application of new refining processes by petrochemical companies, the quality of petroleum coke has deteriorated year by year, and the sulfur content, impurity content and powder content have gradually increased, making the gap in high-quality petroleum coke larger and the price higher, resulting in an increase in the cost of carbon anodes year by year.

[0035] The technical solution provided by the embodiment of the present invention is to solve the above technical problems, and the overall idea is as follows:

[0036] In a first aspect, an embodiment of the present application provides a prebaked anode for aluminum electrolysis, wherein the prebaked anode for aluminum electrolysis is composed of a first anode terminal and a second anode terminal;

[0037] The raw materials of the first anode terminal include: petroleum coke for the first anode terminal;

[0038] The raw materials of the second anode end include: petroleum coke products for the second anode end;

[0039] The quality of the petroleum coke used at the first anode end is better than the quality of the petroleum coke products used at the second anode end.

[0040] The embodiment of the present application provides a prebaked anode for aluminum electrolysis, specifically a carbon anode for aluminum electrolysis that can save resources, and the prebaked anode for aluminum electrolysis is composed of a first anode terminal and a second anode terminal. On the one hand, by selecting a second anode terminal made of low-cost raw materials such as inferior petroleum coke and other petroleum coke substitutes to make the second anode terminal, the available resources for producing carbon anodes are expanded; on the other hand, by selecting a first anode terminal made of petroleum coke with higher quality to make the first anode terminal, as the lower part of the anode that participates in the electrolysis reaction and is consumed. Therefore. Under the premise of ensuring the excellent working performance of the prebaked anode, inferior petroleum coke and other petroleum coke substitutes are efficiently utilized, the utilization rate of high-quality petroleum coke is improved, the production cost of high-quality carbon anodes is reduced, and high-quality resources are saved, which effectively solves the technical problem of high production cost of existing prebaked anodes for aluminum electrolysis.

[0041] In the present application, the quality classification of petroleum coke can be carried out according to the existing classification standards, such as being divided into different grades according to different indicators such as sulfur content, volatile matter and ash content, and each grade is further divided into A, B, C, etc. according to quality; according to actual needs, ensuring that the quality of the first anode end petroleum coke is better than the quality of the second anode end petroleum coke products can achieve the effect of cost saving.

[0042] In the present application, the petroleum coke products for the second anode end may specifically include low-cost inferior petroleum coke and petroleum coke substitutes that can perform similar functions to petroleum coke.

[0043] As an implementation method of an embodiment of the present application, the quality classification standard number of the petroleum coke used for the first anode end includes at least one of No. 1, 2A, 2B, 2C, 3A, 3B, 3C, 4A and 4B.

[0044] According to the quality classification of petroleum coke, petroleum coke is divided into different grades according to different indicators such as sulfur content, volatile matter and ash content, and each grade is divided into A, B, C, etc. according to quality. In this application, high-quality petroleum coke with higher quality classification is made into the first anode end, which serves as the lower part of the anode that participates in the electrolysis reaction and is consumed, thereby ensuring the excellent working performance of the prebaked anode.

[0045] As an implementation method of an example of the present application, the quality classification standard number of the second petroleum coke includes at least one of 2A, 2B, 2C, 3A, 3B, 3C, 4A, 4B, 5 and 6.

[0046] As an implementation of an example of the present application, the petroleum coke substitute includes at least one of low-ash coal, lignite, high-sulfur coke and asphalt coke.

[0047] In the present application, inferior petroleum coke with a lower quality classification and other petroleum coke substitutes are efficiently utilized to make a second anode terminal, thereby expanding the available resources for producing carbon anodes, improving the utilization rate of high-quality petroleum coke, reducing the production cost of high-quality carbon anodes, saving high-quality resources, and effectively solving the technical problem of high production cost of existing prebaked anodes for aluminum electrolysis.

[0048] As an implementation of the embodiment of the present application, the height H of the first anode terminal 1 , the height H of the second anode terminal 2 , the height H of the prebaked anode residue 3 and the overall height H of the prebaked anode for aluminum electrolysis 0 The relationship satisfies:

[0049] H 1 +H 2 =H 0 ;as well as

[0050] H 3 –H 2 =△H;

[0051] Wherein, ΔH represents the height H of the prebaked anode residues. 3 Subtract the height H of the second anode terminal 2 Value; △H>0mm.

[0052] In the present application, the height H of the prebaked anode butts taken out of the electrolytic cell after the electrolysis is completed is 3 For reference, let the second anode end (made of inferior petroleum coke with lower quality classification and other petroleum coke substitutes, etc.) that does not participate in the aluminum electrolysis reaction, and the height of the second anode end is also referred to as H 上 ) is slightly lower than the height H of the prebaked anode residue 3 (Hereinafter, the height of the prebaked anode butts is also referred to as H 残 ), thereby effectively ensuring that the first anode end participating in the aluminum electrolysis reaction (made of high-quality petroleum coke with higher quality classification, hereinafter, the height of the first anode end is also referred to as H 下 ) can meet the needs of aluminum electrolysis reaction and avoid the second anode end from participating in the aluminum electrolysis reaction, so that the prebaked anode for aluminum electrolysis has excellent working performance while greatly reducing the production cost. Among them, the overall height H of the prebaked anode for aluminum electrolysis 0 It should be understood as the height of the carbon anode dimensions to be prepared.

[0053] As an implementation manner of the embodiment of the present application, the ΔH satisfies: 5mm≤ΔH≤50mm.

[0054] In the present application, △H is controlled to satisfy: 5mm≤△H≤50mm, which can not only maximize the reduction of the production cost of the prebaked anode for aluminum electrolysis, but also ensure the excellent working performance of the prebaked anode for aluminum electrolysis. In some specific embodiments, △H can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, etc.; preferably, it is 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm; more preferably, it is 9mm, 10mm, 11mm, 12mm.

[0055] As an implementation method of the present application, the height H of the prebaked anode butts is 3 It is 120mm~170mm.

[0056] After a certain number of days of use of carbon anodes in the aluminum electrolysis process, the unused anodes are pulled out and replaced with new ones. The pulled out old anodes are called prebaked anode scraps. The height of prebaked anode scraps is generally 120mm-170mm, and the weight is about 150kg-220kg, which is about 16%-22.5% of the weight of new anodes.

[0057] As an implementation manner of the embodiment of the present application, the raw material of the first anode terminal also includes: an adhesive.

[0058] As an implementation manner of the embodiment of the present application, the raw material of the second anode terminal also includes: an adhesive.

[0059] In the present application, the preparation formula of the first anode terminal and the second anode terminal in the prebaked anode for aluminum electrolysis is not specifically limited. The key is that the main raw material petroleum coke in the preparation formula of the first anode terminal and the second anode terminal is selected according to the above content, so that the technical effect of "improving the utilization rate of high-quality petroleum coke and reducing the production cost of high-quality carbon anodes while ensuring the excellent working performance of the prebaked anode" can be achieved. In some specific embodiments, the above-mentioned binder includes coal tar or a mixture of coal tar and one or more of furan resin, phenolic resin, and epoxy resin, and its function is to knead and shape the main raw materials such as petroleum coke to form a paste for subsequent processes. In order to achieve other better performance, some other additives such as activated carbon, alumina sol, nano alumina, etc. can be adaptively added to the preparation formula of the first anode terminal and the second anode terminal to meet the actual use needs. In addition, the amount of petroleum coke and the binder in the formula can also be selected according to actual needs and according to the conventional process or the formula amount reported in the prior art (such as Chinese patent CN201410160941.1). Generally speaking, in the preparation formula of the first anode terminal and the second anode terminal, the proportion of petroleum coke is about 75% to 88% by mass, and the amount of binder is about 12% to 20% by mass.

[0060] In a second aspect, an embodiment of the present application provides a method for preparing a prebaked anode for aluminum electrolysis according to the first aspect, the preparation method comprising:

[0061] Mixing the raw materials of the first anode terminal to obtain a first mixed material;

[0062] Mixing the raw materials of the second anode terminal components to obtain a second mixed material;

[0063] Placing the first mixed material and the second mixed material into a forming mold in sequence, and then vibrating and forming the mold to obtain an anode green body;

[0064] The anode green body is calcined to obtain a prebaked anode for aluminum electrolysis.

[0065] In the present application, the process parameters not specifically described in the preparation method of the prebaked anode for aluminum electrolysis can be carried out according to the existing technology or conventional process. For example, in some specific embodiments, the various component raw materials of the first anode end are mixed to obtain a first mixture; and the various component raw materials of the second anode end are mixed to obtain a second mixture. The specific process can be: the weighed carbonaceous aggregate (petroleum coke) and the binder are mixed evenly and put into a kneading machine, the kneading machine is started, and then the additives are gradually added, and the kneading temperature is controlled between 165°C and 195°C. The first mixture and the second mixture are placed in a forming mold in turn, and then vibrated and formed to obtain the specific parameters of the anode green body include: the molding pressure is between 2 and 8MPa. The process parameters for baking the anode green body include: within a temperature range of 1000°C to 1300°C.

[0066] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are only intended to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then proceed according to general international standards, conventional conditions, or according to the conditions recommended by the manufacturer.

[0067] Example 1

[0068] The 200kA series electrolytic cells of an aluminum electrolytic enterprise use carbon anodes produced by a carbon plant with dimensions of 1500×660×570mm (length×width×height). The aggregate originally used by the carbon plant is No. 3 B-grade delayed petroleum coke. The ingredients are prepared according to formula 1. The specific ingredients of formula 1 are shown in Table 1. The volume density of the green anode is 1.67g / cm 3 The volume density of the anode after calcination is 1.59 g / cm 3 After the anode upper tank is used, the average height of the residual anode is 160mm.

[0069] In order to reduce production costs, different aggregates are used in the lower and upper parts of the anode. The lower part of the anode still uses No. 3 B-grade delayed petroleum coke as aggregate. 下 )=570-160+5=415mm, batch according to recipe 1, # Kneading is performed in a kneading pot. The kneaded paste is referred to as paste 1. The paste 1 (686.12 kg) required for the lower part of each anode is placed in a forming mold. The upper part of the anode uses No. 6 delayed petroleum coke as aggregate and is prepared according to formula 1. After testing, it is found that the volume density of the green anode is 1.63 g / cm under the petroleum coke and original particle formula. 3 The volume density of the anode after calcination is 1.54 g / cm 3 , after the materials are prepared, #Kneading is carried out in a kneading pot. The kneaded paste is referred to as paste 2. The paste 2 (250.12 kg) required for the upper part of each anode is placed into the above-mentioned molding mold with paste 1 for vibration molding. The subsequent steps (anode paste-vibration molding-cooling-roasting-cleaning-assembly-anode carbon block, which is the same as ordinary pre-baked carbon anode) remain unchanged.

[0070] By using this invention, the cost of each anode is reduced by 80 yuan, and the production cost of aluminum ingots is reduced by about 35 yuan / t-Al.

[0071] Example 2

[0072] The anodes used in the 300kA series electrolytic cells of an aluminum electrolytic enterprise are 1530×660×630mm (length×width×height) produced by a carbon plant. The aggregate used by the carbon plant is No. 4 A-grade delayed petroleum coke. The ingredients are prepared according to Formula 2. The specific ingredients of Formula 2 are shown in Table 1. The volume density of the green anode is 1.66g / cm 3 The volume density of the anode after calcination is 1.58 g / cm 3 After the anode upper tank is used, the average height of the residual anode is 140mm.

[0073] In order to reduce production costs, different aggregates are used for the lower and upper parts of the anode. The lower part of the anode still uses 4#A grade delayed petroleum coke as aggregate. 下 )=570-140+20=450mm, batch according to recipe 2, # The kneading is carried out in a kneading pot. The kneaded paste is referred to as paste 1. The paste 1 (754.32 kg) required for the lower part of each anode is placed in a forming mold. The upper part of the anode uses low-ash coal as aggregate and is prepared according to formula 2. After testing, it is found that the volume density of the green anode is 1.61 g / cm when using low-ash coal formula 2. 3 The volume density of the anode after calcination is 1.51 g / cm 3 , after the materials are prepared, # Kneading is carried out in a kneading pot. The kneaded paste is referred to as paste 2. The paste 2 (292.64 kg) required for the upper part of each anode is placed in the above-mentioned molding mold with paste 1 for vibration molding. The subsequent steps (anode paste-vibration molding-cooling-roasting-cleaning-assembly-anode carbon block, which is the same as ordinary pre-baked carbon anode) remain unchanged.

[0074] By using this invention, the cost of each anode is reduced by 110 yuan, and the production cost of aluminum ingots is reduced by about 65 yuan / t-Al.

[0075] Example 3

[0076] The anode size used in the 400kA series electrolytic cells of an electrolytic aluminum enterprise is 1550×660×620mm (length×width×height). The aggregate used by the carbon plant is No. 5 delayed petroleum coke. The ingredients are prepared according to Formula 3. The specific ingredients of Formula 3 are shown in Table 1. The volume density of the green anode is 1.65g / cm 3 The volume density of the anode after calcination is 1.58 g / cm 3 After the anode upper tank is used, the average height of the residual anode is 150mm.

[0077] In order to reduce production costs, different aggregates are used for the lower and upper parts of the anode. The lower part of the anode still uses No. 5 delayed petroleum coke as aggregate. 下 )=620-150+40=510mm, batch according to recipe 3, # The kneading is carried out in a kneading pot. The kneaded paste is referred to as paste 1. The paste 1 (860.85 kg) required for the lower part of each anode is placed in a forming mold. The upper part of the anode uses high sulfur coke with a sulfur content of 6% as the aggregate and is prepared using formula 3. After testing, it is found that when anthracite is used as the aggregate and formula 3 is used, the volume density of the green anode is 1.64 g / cm 3 The volume density of the anode after calcination is 1.56 g / cm 3 , after the materials are prepared, # Kneading is carried out in a kneading pot. The kneaded paste is referred to as paste 2. The paste 2 (184.55 kg) required for the upper part of each anode is placed in the above-mentioned molding mold with paste 1 for vibration molding. The subsequent steps (anode paste-vibration molding-cooling-roasting-cleaning-assembly-anode carbon block, the same as ordinary pre-baked carbon anode) remain unchanged.

[0078] By using this invention, the cost of each anode is reduced by 60 yuan, and the production cost of aluminum ingots is reduced by about 30 yuan / t-Al.

[0079] Example 4

[0080] The anode size used in the 500kA series electrolytic cells of an electrolytic aluminum enterprise is 1850×700×650mm (length×width×height). The aggregate used by the carbon plant is No. 2 Grade A delayed petroleum coke. The ingredients are prepared according to Formula 4. The specific ingredients of Formula 4 are shown in Table 1. The volume density of the green anode is 1.67g / cm 3 The volume density of the anode after calcination is 1.59 g / cm 3 After the anode upper tank is used, the average height of the residual anode is 130mm.

[0081] In order to reduce production costs, different aggregates are used for the lower and upper parts of the anode. The lower part of the anode still uses No. 2 A-grade delayed petroleum coke as aggregate. 下)=650-130+50=570mm, batch according to recipe 4, # Kneading is performed in a kneading pot. The kneaded paste is referred to as paste 1. The paste 1 (1232.71 kg) required for the lower part of each anode is placed in a forming mold. The upper part of the anode uses semi-coke as the aggregate and is prepared using formula 4. After testing, it is found that the raw anode volume density is 1.63 g / cm when semi-coke and formula 4 are used. 3 The volume density of the anode after calcination is 1.55 g / cm 3 , after the materials are prepared, # Kneading is carried out in a kneading pot. The kneaded paste is referred to as paste 2. The paste 2 (168.88 kg) required for the upper part of each anode is placed in the above-mentioned molding mold with paste 1 for vibration molding. The subsequent steps (anode paste-vibration molding-cooling-roasting-cleaning-assembly-anode carbon block, the same as ordinary pre-baked carbon anode) remain unchanged.

[0082] By using this invention, the cost of each anode is reduced by 135 yuan, and the production cost of aluminum ingots is reduced by about 50 yuan / t-Al.

[0083] Table 1 is a table of specific ingredients of each formulation in Examples 1-4, wherein the aggregate is specifically a petroleum coke for the first anode end or a petroleum coke product for the second anode end.

[0084] Table 1 Anode production formula used in Examples 1-4

[0085]

[0086]

[0087] It should be understood that the endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0088] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, the term "and / or" appearing in this article is only a kind of association relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone.

[0089] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A prebaked anode for aluminum electrolysis, characterized in that: The prebaked anode for aluminum electrolysis is composed of a first anode terminal and a second anode terminal; The raw materials of the first anode terminal include: petroleum coke for the first anode terminal; The raw materials of the second anode end include: petroleum coke products for the second anode end; The quality of the petroleum coke used at the first anode end is better than the quality of the petroleum coke products used at the second anode end; The first anode end is the lower part of the anode that participates in the electrolysis reaction and is consumed; The quality classification standard number of the first anode end petroleum coke includes at least one of No. 1, 2A, 2B, 2C, 3A, 3B, 3C, 4A and 4B; The second anode end petroleum coke product includes at least one of a second petroleum coke and a petroleum coke substitute, the quality classification standard number of the second petroleum coke includes at least one of 2A, 2B, 2C, 3A, 3B, 3C, 4A, 4B, No. 5 and No. 6, and the petroleum coke substitute includes at least one of low-ash coal, semi-coke, high-sulfur coke and asphalt coke; The relationship between the height H1 of the first anode terminal, the height H2 of the second anode terminal, the height H3 of the prebaked anode butts, and the overall height H0 of the prebaked anode for aluminum electrolysis satisfies: H1+H2=H0; and H3-H2=△H; Wherein, △H represents the value of the height H3 of the prebaked anode butt minus the height H2 of the second anode end, and the △H satisfies: 5mm≤△H≤50mm; The height H3 of the prebaked anode butts is 120 mm to 170 mm.

2. The prebaked anode for aluminum electrolysis according to claim 1, characterized in that: The material of the first anode terminal further includes: an adhesive.

3. The prebaked anode for aluminum electrolysis according to claim 1, characterized in that: The material of the second anode terminal also includes: an adhesive.

4. A method for preparing a prebaked anode for aluminum electrolysis according to any one of claims 1 to 3, characterized in that: The preparation method comprises: Mixing the raw materials of the first anode terminal to obtain a first mixed material; Mixing the raw materials of the second anode terminal components to obtain a second mixed material; Placing the first mixed material and the second mixed material into a forming mold in sequence, and then vibrating and forming the mold to obtain an anode green body; The anode green body is calcined to obtain a prebaked anode for aluminum electrolysis.

Images