Aluminum reduction pot lining material and preparation method therefor, aluminum reduction pot

Abstract

Disclosed in the present application is an aluminum reduction pot lining material, in terms of mass fraction, the aluminum reduction pot lining material comprises: 10-25 parts of first fly ash particles, the particle size of the first fly ash particles being greater than 3 mm but not greater than 10 mm; 10-30 parts of second fly ash particles, the particle size of the second fly ash particles being greater than 1 mm but not greater than 3 mm; 10-50 parts of third fly ash particles, the particle size of the third fly ash particles being greater than 0.05 mm but not greater than 1 mm; and 20-30 parts of fourth fly ash particles, the particle size of the fourth fly ash particles being not greater than 0.05 mm.

Description

Aluminum electrolytic cell lining material and preparation method thereof, aluminum electrolytic cell

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202310823848.3 filed on July 6, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of aluminum industry, and in particular to aluminum electrolysis. Background Art

[0004] Fly ash, the fine dust collected from the flue gases after coal combustion, is the primary solid waste emitted by coal-fired power plants. Coal-fired power plants emit 80 million tons of fly ash annually, requiring 300,000 mu (approximately 1,000 acres) of land for storage. Large quantities of fly ash accumulate in ash yards, containing toxic chemicals and possessing a fine particle size. Poor management can easily generate large amounts of dust, polluting the atmosphere, water systems, and groundwater. While the development of my country's comprehensive solid waste utilization industry has resulted in over 100 mature technologies for fly ash utilization, and the utilization rate has been increasing year by year, the actual utilization rate remains below 50%.

[0005] Industrial aluminum reduction cells are the primary equipment for aluminum electrolysis. Their cathode is a cradle-like steel shell, with insulation, heat-insulating materials, an impermeable layer, and carbon materials inside, collectively referred to as the bottom lining. Currently, commonly used insulation and heat-insulating materials include clay bricks, asbestos boards, calcium silicate boards, aluminum silicate boards, diatomaceous earth bricks, alumina, various nano-insulation boards, and refractory particles.

[0006] Analysis, testing, and practical applications have proven that refractory bricks made from fly ash meet relevant standards, with key performance parameters such as thermal conductivity meeting the requirements for insulation materials. However, due to the inherent properties of fly ash, its proportion in refractory or insulation bricks is relatively low, generally not exceeding 50%. Furthermore, the bricks require mixing, molding, high-temperature firing, and special curing before they can be used. Therefore, fly ash poses a challenge when used in aluminum electrolytic cell linings.

[0007] Summary of the Invention

[0008] By utilizing one or more embodiments of the present disclosure, the technical problem of inconvenience in using fly ash when applied to the inner lining of aluminum electrolytic cells is solved.

[0009] In a first aspect, according to some embodiments of the present disclosure, the aluminum electrolytic cell lining material includes, in parts by mass: 10-25 parts of first fly ash particles, the particle size of the first fly ash particles is not greater than 10 mm and is greater than 3 mm; 10-30 parts of second fly ash particles, the particle size of the first fly ash particles is not greater than 3 mm and is greater than 1 mm; 10-50 parts of third fly ash particles, the particle size of the first fly ash particles is not greater than 1 mm and is greater than 0.05 mm; and 20-30 parts of fourth fly ash particles, the particle size of the first fly ash particles is not greater than 0.05 mm.

[0010] In a second aspect, according to some embodiments of the present disclosure, a method for preparing an aluminum electrolysis cell lining material is provided. The method comprises the following steps: providing fly ash raw material, granulating the fly ash raw material to obtain fly ash pellets; sintering and solidifying the fly ash pellets to obtain fly ash particles; passing the fly ash particles through a 10 mm lower sieve, collecting the 10 mm undersize material, passing the 3 mm lower sieve, collecting the 3 mm oversize material, to obtain first fly ash particles; collecting the 3 mm undersize material, passing the 1 mm lower sieve, collecting the 1 mm oversize material, to obtain second fly ash particles; collecting the 1 mm undersize material, passing the 0.05 mm lower sieve, collecting the 0.05 mm oversize material, to obtain third fly ash particles; and collecting the 0.05 mm undersize material, to obtain fourth fly ash particles; mixing the first fly ash particles, the second fly ash particles, the third fly ash particles, and the fourth fly ash particles in a mass ratio of (10-25): (10-30): (10-50): (20-30) to obtain the aluminum electrolytic cell lining material.

[0011] In a third aspect, according to some embodiments of the present disclosure, the aluminum electrolysis cell comprises a cell body; and a lining located at the bottom of the cell body, wherein the lining comprises the aluminum electrolysis cell lining material described in any embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] FIG1 is a schematic flow chart showing a method for preparing an aluminum electrolytic cell lining material according to some embodiments of the present disclosure;

[0015] FIG2 shows a schematic structural diagram of an electrolytic cell according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0017] Unless otherwise specified, the terms used herein should be understood as having the same meaning as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. In the event of any conflict, the present specification shall take precedence.

[0018] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present disclosure can be purchased from the market or prepared by existing methods.

[0019] Currently, there are technical problems such as inconvenience in using fly ash when applied to the lining of aluminum electrolytic cells.

[0020] In a first aspect, according to some embodiments of the present disclosure, there is provided an aluminum electrolysis cell lining material, wherein the aluminum electrolysis cell lining material comprises, in parts by mass:

[0021] 10-25 parts of first fly ash particles, wherein the particle size of the first fly ash particles is no greater than 10 mm and greater than 3 mm;

[0022] 10-30 parts of the second fly ash particles, the particle size of the first fly ash particles is not greater than 3 mm and greater than 1 mm;

[0023] 10-50 parts of third fly ash particles, the particle size of the first fly ash particles is not greater than 1 mm and greater than 0.05 mm; and

[0024] 20-30 parts of the fourth fly ash particles, the particle size of the first fly ash particles is not greater than 0.05 mm.

[0025] Those skilled in the art will understand that fly ash is composed of granules of varying sizes and shapes, with a particle size of 1-100 μm, 60% of which is less than 20 μm, D90 of which is approximately 65.3 μm, and a specific surface area of ​​0.25-0.5 m 2 / g, is a mixture of crystalline minerals and amorphous minerals. The main chemical components of fly ash are SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2, etc., of which SiO2 and Al2O3 account for more than 60%. Aluminum and silicon elements exist in the form of glass, which is mostly spherical with a smooth surface and good sphericity. Analysis, testing and application practice have proved that refractory bricks made of fly ash as raw material can meet the relevant standards, and their key performance parameters such as thermal conductivity meet the requirements of thermal insulation materials. However, due to the characteristics of fly ash itself, its proportion in refractory bricks or thermal insulation bricks is relatively low, generally not exceeding 50%, and it needs to be mixed, molded, fired at high temperature, and subjected to special curing processes before it can be used.

[0026] According to some embodiments of the present disclosure, the aluminum electrolytic cell lining material includes fly ash particles of various sizes, which can be directly prepared by granulation and sintering, and the preparation is relatively simple; when used, it is directly laid in the aluminum electrolytic cell, and the construction is simple; it is used after laying, and presents a powder form on a macro scale, and even if some fly ash particles are broken in a complex electrolytic working environment due to the lack of complex maintenance, it does not affect its function; the main component of the aluminum electrolytic cell lining material is fly ash, so more fly ash can be consumed, the total utilization rate of fly ash is improved, and the pollution of fly ash to the environment is reduced.

[0027] Furthermore, in some embodiments of the present disclosure, by making the aluminum electrolysis cell lining material into a powder, it reacts with the electrolyte in the aluminum electrolysis process to form a relatively dense barrier layer, preventing further electrolyte penetration. In other words, the aluminum electrolysis cell lining material can replace the impermeable layer.

[0028] In some embodiments of the present disclosure, by making the particle size of the first fly ash particles less than or equal to 10 mm and greater than 3 mm, the content of the first fly ash particles in the lining material of the aluminum electrolytic cell is 10-25 parts; the particle size of the second fly ash particles is less than or equal to 3 mm and greater than 1 mm, the content of the second fly ash particles in the lining material of the aluminum electrolytic cell is 10-30 parts; the particle size of the third fly ash particles is less than or equal to 1 mm and greater than 0.05 mm, the content of the third fly ash particles in the lining material of the aluminum electrolytic cell is 10-50 parts; the particle size of the fourth fly ash particles is less than or equal to 0.05 mm, the content of the fourth fly ash particles in the lining material of the aluminum electrolytic cell is 20-30 parts; the electrolytic cell prepared using the aluminum electrolytic cell lining material can obtain a suitable thermal insulation effect and is easy to construct on site. It's easy to understand that by varying the fly ash particle size range and content in the aluminum electrolytic cell lining material, the material can be made to have good fluidity, facilitating construction. It can also provide a compact structure with minimal voids, thereby ensuring the thermal insulation performance of the aluminum electrolytic cell lining. If the overall particle size of the aluminum electrolytic cell lining material is too large, the voids between the fly ash particles will be too large, affecting the thermal insulation performance. If the overall particle size of the aluminum electrolytic cell lining material is too small, the fly ash particles will have poor fluidity and may stick together, making construction difficult.

[0029] As an example, the aluminum electrolytic cell lining material can be used in the following way: the aluminum electrolytic cell lining material is laid at the corresponding position in the electrolytic cell, leveled with a template, compacted with a vibrator, and the surface is horizontal after compaction. The plane tolerance of the aluminum electrolytic cell lining is within ±4mm, and the height tolerance is within ±3mm.

[0030] In some embodiments of the present disclosure, by rationally designing the particle size distribution of fly ash particles, the lining material of the aluminum electrolytic cell has better thermal insulation effect and convenient construction; the raw materials mainly composed of fly ash can be directly granulated and sintered to prepare it, and it can be directly laid when used, which is convenient to use.

[0031] In some embodiments of the present disclosure, the sum of the mass contents of aluminum oxide and silicon oxide in the first fly ash particles, the second fly ash particles, the third fly ash particles, and the fourth fly ash particles is no less than 80%.

[0032] When the total content of aluminum oxide and silicon oxide in the first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles is respectively above 80%, the aluminum electrolytic cell lining material can have sufficient fire resistance.

[0033] In some embodiments of the present disclosure, the aluminum electrolytic cell lining material further includes, by weight, 0.5-5 parts of an adhesive.

[0034] In other embodiments of the present disclosure, the first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles respectively contain fly ash and a binder. In terms of mass, the mass of the binder accounts for 0.5-5% of the total mass of the first fly ash particles; the mass of the binder accounts for 0.5-5% of the total mass of the second fly ash particles; the mass of the binder accounts for 0.5-5% of the total mass of the third fly ash particles; and the mass of the binder accounts for 0.5-5% of the total mass of the fourth fly ash particles.

[0035] The adhesive can increase the strength of fly ash particles in various particle size ranges, so that the aluminum electrolytic cell lining material can withstand stronger construction actions and increase its stability during operation.

[0036] In some embodiments of the present disclosure, the adhesive includes at least one of bentonite, water glass, slaked lime, and clay.

[0037] The adhesive can withstand the temperature of the working environment of the aluminum electrolytic lining material.

[0038] In a second aspect, according to some embodiments of the present disclosure, a method for preparing an aluminum electrolytic cell lining material is provided. The method for preparing an aluminum electrolytic cell lining material can prepare the aluminum electrolytic cell lining material of any embodiment of the first aspect. Referring to FIG. 1 , the method for preparing an aluminum electrolytic cell lining material comprises the following steps:

[0039] S1: providing fly ash raw material, granulating the fly ash raw material to obtain fly ash pellets;

[0040] S2: After the fly ash pellets are sintered and solidified, fly ash particles are obtained;

[0041] S3: Pass the fly ash particles through a 10 mm lower sieve, collect the undersize particles from the 10 mm sieve, pass them through a 3 mm lower sieve, and collect the oversize particles from the 3 mm sieve to obtain first fly ash particles;

[0042] S4: collecting the 3 mm undersize material and passing it through the 1 mm lower sieve, and collecting the 1 mm oversize material to obtain the second fly ash particles;

[0043] S5: collecting the 1 mm undersize material and passing it through the 0.05 mm lower sieve, and collecting the 0.05 mm oversize material to obtain the third fly ash particles;

[0044] S6: collecting 0.05 mm undersize material to obtain fourth fly ash particles; and

[0045] S7: Mix the first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles in a mass ratio of (10-25): (10-30): (10-50): (20-30) to obtain an aluminum electrolytic cell lining material.

[0046] In some embodiments of the present disclosure, the sum of the mass contents of aluminum oxide and silicon oxide in the fly ash raw material is not less than 80%.

[0047] When the total content of alumina and silicon oxide is within the above range, the aluminum electrolytic cell lining material has sufficient fire resistance.

[0048] In some embodiments of the present disclosure, the fly ash raw material includes fly ash and a binder.

[0049] The adhesive can increase the strength of fly ash particles in various particle size ranges, so that the aluminum electrolytic cell lining material can withstand stronger construction actions and increase its stability during operation.

[0050] In some embodiments of the present disclosure, the adhesive includes at least one of bentonite, water glass, slaked lime, and clay; and / or,

[0051] The mass of the adhesive accounts for 0.5-5% of the total mass of the fly ash raw material.

[0052] The adhesive can withstand the temperature of the working environment of the aluminum electrolytic lining material.

[0053] In some embodiments of the present disclosure, the sintering and curing temperature is 200-1000° C.; and / or the sintering and curing time is 15-30 minutes.

[0054] During the sintering and curing process at the above-mentioned sintering and curing temperature and time, the binder can be dehydrated and the strength of the pellet particles can be maintained.

[0055] In a third aspect, according to some embodiments of the present disclosure, an aluminum electrolysis cell is provided, comprising:

[0056] tank; and

[0057] The lining is located at the bottom of the cell body, and the lining includes the aluminum electrolytic cell lining material of any embodiment of the first aspect.

[0058] The present disclosure will be further described below with reference to specific examples. It should be understood that these examples are intended to illustrate the present disclosure only and are not intended to limit the scope of the present disclosure. Experimental methods in the following examples where specific conditions are not specified are generally measured in accordance with national standards. If no corresponding national standards are available, the methods were performed in accordance with commonly used international standards, conventional conditions, or conditions recommended by the manufacturer.

[0059] Example 1

[0060] This embodiment discloses an aluminum electrolysis cell lining material, which is prepared by the following method:

[0061] S1: mixing fly ash and a binder according to a proportion to obtain a fly ash raw material, and granulating the fly ash raw material to obtain fly ash pellets;

[0062] S2: sintering and solidifying the fly ash pellets to obtain fly ash particles;

[0063] S3: Pass the fly ash particles through a 10 mm lower sieve, collect the undersize particles from the 10 mm sieve, pass them through a 3 mm lower sieve, and collect the oversize particles from the 3 mm sieve to obtain first fly ash particles;

[0064] S4: collecting the 3 mm undersize material and passing it through the 1 mm lower sieve, and collecting the 1 mm oversize material to obtain the second fly ash particles;

[0065] S5: collecting the 1 mm undersize material and passing it through the 0.05 mm lower sieve, and collecting the 0.05 mm oversize material to obtain the third fly ash particles;

[0066] S6: collecting the 0.05 mm undersize material to obtain the fourth fly ash particles;

[0067] S7: mixing the first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles in a mass ratio of 25:30:25:20 to obtain an aluminum electrolytic cell lining material.

[0068] The binder is a water glass-based binder, which accounts for 0.5% of the fly ash raw material by weight. The sintering and curing temperature is 200°C, the sintering and curing time is 15 minutes, and the total weight content of aluminum oxide and silicon oxide in the fly ash raw material is 80%.

[0069] This embodiment also discloses an aluminum electrolytic cell. Please refer to Figure 2. The aluminum electrolytic cell includes: a cell body 1; and a lining 2 arranged at the bottom of the cell body 1, wherein the lining 2 includes a heat insulation layer 21 arranged at the bottom of the cell shell, a thermal insulation layer 22 and a lining material 23 laid on the thermal insulation layer 22. The lining material 23 is the aluminum electrolytic cell lining material prepared in this embodiment 1.

[0070] Example 2

[0071] This embodiment discloses an aluminum electrolysis cell lining material, which is prepared by the following method:

[0072] S1: mixing fly ash and a binder according to a proportion to obtain a fly ash raw material, and granulating the fly ash raw material to obtain fly ash pellets;

[0073] S2: sintering and solidifying the fly ash pellets to obtain fly ash particles;

[0074] S3: Pass the fly ash particles through a 10 mm lower sieve, collect the undersize particles from the 10 mm sieve, pass them through a 3 mm lower sieve, and collect the oversize particles from the 3 mm sieve to obtain first fly ash particles;

[0075] S4: collecting the 3 mm undersize material and passing it through the 1 mm lower sieve, and collecting the 1 mm oversize material to obtain the second fly ash particles;

[0076] S5: collecting the 1 mm undersize material and passing it through the 0.05 mm lower sieve, and collecting the 0.05 mm oversize material to obtain the third fly ash particles;

[0077] S6: collecting the 0.05 mm undersize material to obtain the fourth fly ash particles;

[0078] S7: mixing the first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles in a mass ratio of 20:20:40:20 to obtain an aluminum electrolytic cell lining material.

[0079] The binder is a slaked lime-based binder, which accounts for 2% of the fly ash raw material by weight. The sintering and curing temperature is 600°C, the sintering and curing time is 20 minutes, and the total weight content of aluminum oxide and silicon oxide in the fly ash raw material is 80%.

[0080] This embodiment also provides an aluminum electrolysis cell. Please refer to Figure 2. The aluminum electrolysis cell includes: a cell body 1; and a lining 2 arranged at the bottom of the cell body 1, wherein the lining 2 includes a heat insulation layer 21 arranged at the bottom of the cell shell, a thermal insulation layer 22, and an aluminum electrolysis cell lining material 23 laid on the thermal insulation layer 22. The aluminum electrolysis cell lining material 23 is the aluminum electrolysis cell lining material prepared in this embodiment.

[0081] Example 3

[0082] This embodiment discloses an aluminum electrolytic cell lining material, which is prepared by the following method:

[0083] S1: mixing fly ash and a binder according to a proportion to obtain a fly ash raw material, and granulating the fly ash raw material to obtain fly ash pellets;

[0084] S2: sintering and solidifying the fly ash pellets to obtain fly ash particles;

[0085] S3: Pass the fly ash particles through a 10 mm lower sieve, collect the undersize particles from the 10 mm sieve, pass them through a 3 mm lower sieve, and collect the oversize particles from the 3 mm sieve to obtain first fly ash particles;

[0086] S4: collecting the 3 mm undersize material and passing it through the 1 mm lower sieve, and collecting the 1 mm oversize material to obtain the second fly ash particles;

[0087] S5: collecting the 1 mm undersize material and passing it through the 0.05 mm lower sieve, and collecting the 0.05 mm oversize material to obtain the third fly ash particles;

[0088] S6: collecting the 0.05 mm undersize material to obtain the fourth fly ash particles;

[0089] S7: mixing the first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles in a mass ratio of 15:20:40:25 to obtain an aluminum electrolytic cell lining material.

[0090] The binder is a clay-based binder, which accounts for 5% of the fly ash raw material by weight. The sintering and curing temperature is 800°C, the sintering and curing time is 30 minutes, and the total weight content of aluminum oxide and silicon oxide in the fly ash raw material is 85%.

[0091] This embodiment also discloses an aluminum electrolysis cell. Please refer to Figure 2. The aluminum electrolysis cell includes: a cell body 1; and a lining 2 arranged at the bottom of the cell body 1, wherein the lining 2 includes a heat insulation layer 21 and a thermal insulation layer 22 arranged at the bottom of the cell shell, and an aluminum electrolysis cell lining material 23 laid on the thermal insulation layer 22. The aluminum electrolysis cell lining material 23 is the aluminum electrolysis cell lining material prepared in this embodiment.

[0092] Example 4

[0093] This embodiment discloses an aluminum electrolysis cell lining material, which is prepared by the following method:

[0094] S1: mixing fly ash and a binder according to a proportion to obtain a fly ash raw material, and granulating the fly ash raw material to obtain fly ash pellets;

[0095] S2: sintering and solidifying the fly ash pellets to obtain fly ash particles;

[0096] S3: Pass the fly ash particles through a 10 mm lower sieve, collect the undersize particles from the 10 mm sieve, pass them through a 3 mm lower sieve, and collect the oversize particles from the 3 mm sieve to obtain first fly ash particles;

[0097] S4: collecting the 3 mm undersize material and passing it through the 1 mm lower sieve, and collecting the 1 mm oversize material to obtain the second fly ash particles;

[0098] S5: collecting the 1 mm undersize material and passing it through the 0.05 mm lower sieve, and collecting the 0.05 mm oversize material to obtain the third fly ash particles;

[0099] S6: collecting the 0.05 mm undersize material to obtain the fourth fly ash particles;

[0100] S7: mixing the first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles in a mass ratio of 10:10:50:30 to obtain an aluminum electrolytic cell lining material.

[0101] The binder is a bentonite-based binder, which accounts for 2% of the fly ash raw material by weight. The sintering and curing temperature is 1000°C, the sintering and curing time is 20 minutes, and the total mass content of aluminum oxide and silicon oxide in the fly ash raw material is 87%.

[0102] This embodiment also provides an aluminum electrolysis cell. Please refer to Figure 2. The aluminum electrolysis cell includes: a cell body 1; and a lining 2 arranged at the bottom of the cell body 1, wherein the lining 2 includes a heat insulation layer 21 and a thermal insulation layer 22 arranged at the bottom of the cell shell, and an aluminum electrolysis cell lining material 23 laid on the thermal insulation layer 22. The aluminum electrolysis cell lining material 23 is the aluminum electrolysis cell lining material prepared in this embodiment.

[0103] Example 5

[0104] This embodiment discloses an aluminum electrolytic cell lining material, which is prepared by the following method:

[0105] S1: mixing fly ash and a binder according to a proportion to obtain a fly ash raw material, and granulating the fly ash raw material to obtain fly ash pellets;

[0106] S2: sintering and solidifying the fly ash pellets to obtain fly ash particles;

[0107] S3: Pass the fly ash particles through a 10 mm lower sieve, collect the undersize particles from the 10 mm sieve, pass them through a 3 mm lower sieve, and collect the oversize particles from the 3 mm sieve to obtain first fly ash particles;

[0108] S4: collecting the 3 mm undersize material and passing it through the 1 mm lower sieve, and collecting the 1 mm oversize material to obtain the second fly ash particles;

[0109] S5: collecting the 1 mm undersize material and passing it through the 0.05 mm lower sieve, and collecting the 0.05 mm oversize material to obtain the third fly ash particles;

[0110] S6: collecting the 0.05 mm undersize material to obtain the fourth fly ash particles;

[0111] S7: mixing the first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles in a mass ratio of 15:15:45:25 to obtain an aluminum electrolytic cell lining material.

[0112] The binders are bentonite and clay-based adhesives, accounting for 2% and 2% of the fly ash raw material, respectively. The sintering and curing temperature is 1000°C, the sintering and curing time is 25 minutes, and the combined mass content of alumina and silica in the fly ash raw material is 90%.

[0113] This embodiment also discloses an aluminum electrolysis cell. Please refer to Figure 2. The aluminum electrolysis cell includes: a cell body 1; and a lining 2 arranged at the bottom of the cell body 1, wherein the lining 2 includes a heat insulation layer 21 and a thermal insulation layer 22 arranged at the bottom of the cell shell, and an aluminum electrolysis cell lining material 23 laid on the thermal insulation layer 22. The aluminum electrolysis cell lining material 23 is the aluminum electrolysis cell lining material prepared in this embodiment.

[0114] The aluminum electrolysis cell lining material according to some embodiments of the present disclosure has at least the following advantages compared to the related art:

[0115] According to some embodiments of the aluminum electrolytic cell lining material disclosed herein, the particle size distribution of fly ash particles is reasonably designed, so that the aluminum electrolytic cell lining material has good thermal insulation effect and convenient construction; the raw materials mainly composed of fly ash are directly granulated and sintered to prepare the material, and the material can be directly laid when used, which is convenient to use.

[0116] Various embodiments of the present disclosure may be presented in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of the present disclosure; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numbers within the range. For example, the description of a range from 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0117] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" refer specifically to the directions of the drawings in the accompanying drawings. In addition, in the description of this disclosure, the terms "include", "comprise", etc. mean "including but not limited to". Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising 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 the absence of further restrictions, the elements defined by the phrase "include..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. In this document, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. In this document, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. For the association relationship of more than three associated objects described with "and / or", it means that any one of these three associated objects can exist alone, or any at least two of them exist at the same time. For example, for A, and / or B, and / or C, it can be represented that any one of A, B, and C exists alone, or any two of them exist at the same time, or three of them exist at the same time. In this article, "at least one" refers to one or more, and "multiple" refers to two or more. "At least one", "the following at least one (individual)" or similar expressions refer to any combination of these items, including any combination of single item (individual) or plural items (individual). For example, "at least one (individual) of a, b, or c", or "at least one (individual) of a, b, and c", can all represent: a, b, c, ab (i.e., a and b), ac, bc or abc, where a, b, c can be single or multiple, respectively.

[0118] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily 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 disclosure. Therefore, the present disclosure is not to be limited to the embodiments shown herein, but is to be construed in the broadest manner consistent with the principles and novel features claimed herein.

Claims

1. An aluminum electrolytic cell lining material, which comprises, by weight: 10-25 parts of first fly ash particles, wherein the particle size of the first fly ash particles is not greater than 10 mm and greater than 3 mm; 10-30 parts of second fly ash particles, wherein the particle size of the first fly ash particles is not greater than 3 mm and greater than 1 mm; 10-50 parts of third fly ash particles, wherein the particle size of the first fly ash particles is not greater than 1 mm and greater than 0.05 mm; and 20-30 parts of fourth fly ash particles, wherein the particle size of the first fly ash particles is not greater than 0.05 mm.

2. The aluminum electrolytic cell lining material according to claim 1, wherein: The sum of the mass contents of aluminum oxide and silicon oxide in the first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles is not less than 80%.

3. The aluminum electrolytic cell lining material according to claim 1, wherein: In parts by mass, the aluminum electrolytic cell lining material also includes: 0.5-5 parts of adhesive.

4. The aluminum electrolytic cell lining material according to claim 1, wherein: The first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles respectively contain fly ash and a binder. In terms of mass percentage, the mass of the binder accounts for 0.5-5% of the total mass of the first fly ash particles; the mass of the binder accounts for 0.5-5% of the total mass of the second fly ash particles; the mass of the binder accounts for 0.5-5% of the total mass of the third fly ash particles; and the mass of the binder accounts for 0.5-5% of the total mass of the fourth fly ash particles.

5. The aluminum electrolytic cell lining material according to claim 3 or 4, wherein: The adhesive includes at least one of bentonite, water glass, slaked lime and clay.

6. A method for preparing an aluminum electrolytic cell lining material, comprising the following steps: Providing fly ash raw material, and granulating the fly ash raw material to obtain fly ash pellets; Sintering and solidifying the fly ash pellets to obtain fly ash particles; Pass the fly ash particles through a 10 mm lower sieve, collect the material under the 10 mm sieve, pass the material through a 3 mm lower sieve, and collect the material on the 3 mm sieve to obtain first fly ash particles; Collect the material under the 3 mm sieve and pass it through the 1 mm sieve, and collect the material over the 1 mm sieve to obtain the second fly ash particles; The 1 mm sieve under-size material is collected and passed through the 0.05 mm sieve under-size material, and the 0.05 mm sieve over-size material is collected to obtain third fly ash particles; Collect the obtained 0.05 mm undersize material to obtain fourth fly ash particles; and, The first fly ash particles, the second fly ash particles, the third fly ash particles and the fourth fly ash particles are mixed in a mass ratio of (10-25): (10-30): (10-50): (20-30) to obtain the Aluminum electrolytic cell lining materials.

7. The method for preparing the aluminum electrolytic cell lining material according to claim 6, wherein: The sum of the mass contents of aluminum oxide and silicon oxide in the fly ash raw material is not less than 80%.

8. The method for preparing the lining material of an aluminum electrolytic cell according to claim 6, wherein: The fly ash raw material includes fly ash and a binder.

9. The method for preparing the aluminum electrolytic cell lining material according to claim 8, wherein: The adhesive comprises at least one of bentonite, water glass, slaked lime and clay; and / or, The mass of the adhesive accounts for 0.5-5% of the total mass of the fly ash raw material.

10. The method for preparing the aluminum electrolytic cell lining material according to claim 8, wherein: The sintering and curing temperature is 200-1000°C; and / or, The sintering and curing time is 15-30 minutes.

11. An aluminum electrolysis cell comprising: Tank body; and, The lining located at the bottom of the cell body comprises the aluminum electrolytic cell lining material according to any one of claims 1 to 5.

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