A high-temperature-resistant and oxidation-resistant coating for pre-baked anodes for reducing energy consumption of aluminum electrolytic cells

Abstract

The application discloses a prebaked anode anti-oxidation coating for reducing energy consumption of an aluminum electrolysis cell and a preparation and application method thereof, and belongs to a novel energy-saving and consumption-reducing material for electrolytic aluminum. The material uses potassium feldspar powder, pyrophyllite powder, low-melting-point glass powder and metal oxide as fillers, uses phosphate as a main binder, uses modified glass powder as a pigment, and adds a small amount of performance adjusting agent. The preparation method is convenient, the coating process is simple and easy to implement, special baking process is not needed, the material has the characteristics of low comprehensive cost, high use efficiency, good oxidation resistance and the like. Through adjustment of the preparation method and the coating process of the coating, the baking temperature, the baking time and the coating thickness are adjusted, a coating material with high compactness, high temperature resistance, oxidation resistance, thermal shock resistance and strong bonding force is obtained, the oxidation and peeling of the outer surface of the carbon anode in the production process of electrolytic aluminum can be effectively prevented, carbon residue generation is reduced, electrolyte resistance is reduced, effective pole distance is increased, and energy consumption is reduced; meanwhile, the anode service life is prolonged, unit loss is reduced, and the material has great industrial application prospect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-temperature-resistant anticorrosive paint, and particularly relates to a pre-baked anode high-temperature-resistant antioxidant paint for reducing energy consumption of an aluminum electrolysis cell and a preparation method thereof. BACKGROUND

[0002] The modern electrolytic aluminum industry production adopts the cryolite-alumina fused salt electrolysis method, and the specific method is as follows: the molten cryolite is used as a solvent, the alumina is used as a solute, the carbon body is used as an anode, the aluminum liquid is used as a cathode, and after strong direct current is introduced, an electrochemical reaction is carried out on the two poles in the electrolytic cell at 950-970 DEG C, and electrolysis is carried out. The chemical reaction is mainly carried out through the following equation:

[0003] 2Al2O3+ 3C = 4Al + 3CO2↑

[0004] Anode: 2O 2- + C - 4e - =CO2↑

[0005] Cathode: Al 3+ + 3e - = Al

[0006] The aluminum electrolysis production can be divided into three categories: side-insert anode rod self-baking cell, upper-insert anode rod self-baking cell and pre-baked anode cell. At present, most countries and production enterprises in the world are using large-scale pre-baked cells, and the current intensity of the cell is very large, which not only has high automation degree, low energy consumption, high single-cell output, but also meets the requirements of environmental protection regulations. China has completed the industrial test and industrialization of 180kA, 280kA and 320kA, 400kA, 500kA and 600kA modern pre-baked cells. According to the production process of electrolytic aluminum, the production cost of electrolytic aluminum is roughly composed of the following parts:

[0007] (1) Raw materials: alumina, cryolite, aluminum fluoride, additives (calcium fluoride, magnesium fluoride, etc.), anode material;

[0008] (2) Energy cost: electricity (direct current and alternating current), fuel oil;

[0009] (3) Labor cost: wages and other management expenses;

[0010] (4) Other expenses: equipment depreciation and depreciation, financial expenses, transportation expenses, taxes, etc.

[0011] But compared with the international advanced electrolytic aluminum enterprises, we still have a huge gap, mainly in the energy utilization efficiency is lower than the international advanced level of 15%; current efficiency difference of 2-3 percentage points; ton aluminum power consumption difference of 300-800 KWh; electrolytic aluminum anode production process energy consumption difference of 3Gj / t or so; electrolytic aluminum anode consumption difference of 30-60 Kg (equivalent to standard coal about 75-150 Kg); electrolytic cell life difference of 1000 days or so; anode effect coefficient international advanced level is below 0.1 times / day·cell, China's best level is about 0.3 times / day·cell. Among them, the carbon anode is a very important problem, its quality directly affects the normal progress of electrolysis and product quality. Data show that, due to the quality of carbon anode problem will lead to in the process of electrolysis more carbon residue into the aluminum liquid, each production of a ton of primary aluminum about 5 Kg-15 Kg of waste residue, resulting in electrolysis voltage drop rise, cell overheating, power consumption intensified problems, electrolyte conductivity will be significantly reduced.

[0012] At present, the following several ways to reduce the occurrence of this problem:

[0013] Looking for high-quality anode carbon material, through technical improvement, constantly improve its use effect. The production of anode carbon material is mainly petroleum coke, pitch and other through a series of crushing, calcination, batching, mixing and so on, the high-quality raw materials can be well solved these problems to a certain extent. However, with the huge growth of electrolytic aluminum production, the amount of high-quality petroleum coke is difficult to meet the demand, and there will be a big problem in cost. In the process of electrolytic production, the voltage is controlled, and the secondary reaction of aluminum is reduced, but this way will directly affect the amount of aluminum, and the effect is not very obvious. By coating a special coating on the surface of the anode carbon material. This coating can form a dense, continuous and high-strength film layer on the surface of the anode, which can prevent oxidation caused by direct contact of high-temperature air and carbon block and reduce loss. There are many known coating formulas, such as the patent number CN114806231A discloses an anti-oxidation coating, which needs to modify the surface of the main filler during preparation, and then needs to react in a reaction kettle under high temperature and high pressure for 10-14 hours, and the coating also needs to be cured for 8-24 hours after coating, whether it is the complexity of the production process or the efficiency of the construction, it is greatly discounted; The patent number CN102532964A discloses an anti-oxidation coating for carbon-containing refractory material, which selects water glass as the binder, but in the electrolytic aluminum industry, there are strict restrictions on silicate materials, which greatly reduces its usability; The coating disclosed in Japanese patent JP60108388A needs to be coated twice during use, and there are many problems in actual production. After communication with actual production enterprises, so far, the enterprise has not found a coating with good effect, simple and convenient construction, controllable cost and no pollution to primary aluminum. Therefore, how to improve the formula and preparation process to obtain a coating with simple preparation method, controllable cost, convenient use, excellent high-temperature resistance and oxidation resistance has become the technical research focus in the aluminum electrolysis industry. However, so far, no technology similar to the technical content of the present application has been disclosed. SUMMARY

[0014] In order to overcome the shortcomings of the prior art, the present application provides a kind of prebaked anode high temperature resistant and oxidation resistant coating for reducing the energy consumption of aluminum electrolysis cell and its preparation and application method, the high temperature resistant and oxidation resistant coating can be applied to the surface of electrolytic aluminum prebaked anode carbon material, with excellent high temperature resistance, oxidation resistance and cold and hot impact resistance.

[0015] In order to achieve the above purpose, the present application is realized by the following technical scheme, a kind of high temperature resistant and oxidation resistant coating, the components and mass percentage of the coating are as follows:

[0016] Low melting point glass powder 110%-50%

[0017] Low melting point glass powder 25%-25%

[0018] Potassium feldspar powder 5%-30%

[0019] Pyrophyllite powder 20%-60%

[0020] Boron carbide powder 1.5%-20%

[0021] Aluminum oxide powder 2%-25%

[0022] Titanium white powder 1.0-10%

[0023] Magnesium oxide powder 3%-15%

[0024] The paint binder is:

[0025] Organic silicon 2%-15%

[0026] Phosphate resin 75%-98%

[0027] Deionized water appropriate amount

[0028] Powder: binder = 100: 100-125

[0029] Preferably, the low-melting glass powder 1 contains 55%-75% of SiO2, 5%-20% of B2O3 and 3%-10% of Na2O by weight; the low-melting glass powder 2 contains 60%-75% of SiO2, 10-25% of B2O3.

[0030] Preferably, the feldspar powder is potassium feldspar powder, containing 50%-65% of SiO2, 5%-25% of Al2O3 and 10%-15% of K2O by weight.

[0031] Preferably, the pyrophyllite powder contains 55%-75% of SiO2 and 10%-45% of Al2O3 by weight.

[0032] Preferably, the organic silicon is first added to the phosphate resin, and the amount of the phosphate resin and the amount of the organic silicon are 100:2-15 by mass, the glass powder is mixed into the treated phosphate resin solution, and the mixed slurry is sent into a high-speed mixer for sufficient mixing for 0.5h to obtain a glass powder semi-finished product slurry after surface modification.

[0033] Preferably, the amount of the phosphate resin and the amount of the organic silicon resin are 100:5-10 by mass;

[0034] The preparation method of the coating of the present application is as follows: firstly, a proper amount of silicone is added to phosphate resin and mixed well, without adding water in this process, then low-melting-point glass powder is mixed by a high-speed mixer to obtain modified glass powder slurry, other powders required by the coating are sequentially added to the slurry and stirred uniformly, and then the slurry is put into a high-speed dispersing machine for stirring and dispersing after adding an appropriate amount of water, so as to obtain the coating of the present application.

[0035] In the present application, surface chemical coating modification method is applied, the surface of glass powder is modified by silicone, the process that the hydrophilic group in silicone is decomposed into active silanol (ΞSi-OH) when meeting water, and the hydrogen bond is formed with the hydroxyl group on the surface of glass powder, and finally the covalent bond is formed by dehydration, so that the surface of glass powder is finally covered by silicone to complete the surface modification, and the phosphate resin molecules are inserted thereinto, and finally the main film forming effect is achieved.

[0036] In the present application, two kinds of glass powder with different melting points are mixed in a ratio of 4:1-3, and a molten glass state layer is formed in a wide temperature range (400-900℃), which has a good oxygen isolation ability. Potash feldspar powder and pyrophyllite powder mainly contain silicon dioxide and aluminum oxide, which can have a good high-temperature resistance. Titanium dioxide powder and magnesium oxide powder can effectively improve the sintering temperature of the coating and the bonding performance with the base material. Boron carbide powder is mainly responsible for adjusting the chemical compatibility of the coating with the base material, and above 723℃, it can react with carbon in the base material to generate B2O 3， When the coating has a small crack defect at high temperature, it has a sealing effect, so that the coating has a certain self-healing ability.

[0037] In the present application, phosphate is used as the main binder, which avoids the pollution problem of original aluminum caused by most coatings selected water glass, silica sol and other silicon-containing resins. And through the modification process of silicone resin on glass powder, the phosphate is used as the main film forming material, and the silicone promotes film forming at low temperature (<400℃), and the silicone gradually loses its effect when the temperature is higher than 400℃, but the low-melting-point glass powder begins to melt and form a film, so that the surface of the sample is always covered with a continuous and dense film layer during the whole process, and excellent oxidation resistance is achieved.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] The application combines the actual working conditions and use requirements, avoids the commonly used water glass, silica sol and other silicon-containing resins in the selection of the binder, selects phosphate resin as the main binder, and introduces organosilicon to further improve the film forming performance, so that the film layer after film forming is dense and continuous. (2) Through the compounding of two kinds of glass powder, the surface of the substrate can be covered with a molten glass film layer in a relatively wide temperature range (400-900 DEG C), which can play a good insulation effect, and at the same time, during the whole use process, the film layer will inevitably produce micro-cracks or defects, and the boron carbide introduced in the coating can play a filling and sealing role at high temperature, so that the coating has a certain self-repairing ability, and the compatibility and matching of the coating after film forming and the substrate are improved, and the bonding force between them is increased.

[0040] (3) The binder and filler used in the application have stable high-temperature performance and do not harm the human body, can begin to form a film and adhere to the surface of the substrate at 550-600 DEG C, have a certain self-repairing ability, and the film layer will not decompose or evaporate at a working temperature of 900 DEG C, will always adhere to the surface of the substrate, isolate oxygen, prevent the oxidation and peeling of the anode carbon material, and ultimately reduce the carbon residue content, reduce the power consumption and prolong the anode replacement cycle. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 Surface modification mechanism of organosilicon on glass powder

[0042] The hydrophilic group in the organosilicon resin is decomposed into active silanol (ΞSi-OH) when it meets water, and forms a hydrogen bond with the hydroxyl group on the surface of the glass powder, and finally dehydrates to form a covalent bond. The surface of the glass powder is finally covered with organosilicon to complete the surface modification.

[0043] Figure 2 Schematic diagram of the surface state of the glass powder after surface modification

[0044] Phosphate resin is inserted therein and cooperates with organosilicon resin to complete the film forming process. DETAILED DESCRIPTION

[0045] In order to further understand the application, the preferred embodiments of the application are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the application, and are not limitations of the claims of the application. All raw materials of the application are not particularly limited in source, and can be purchased on the market or prepared according to conventional methods well known to those skilled in the art. 1. Specific examples

[0047] Prepare each embodiment of the application according to Table 1, and prepare each comparative example of the application according to Table 2,

[0048] Preparation method: first, the silicone is added to the phosphate resin, the amount of which is 2-15 times of the amount of silicone by mass, the glass powder is mixed into the treated phosphate resin solution, the mixed slurry is sent into a high-speed mixer for thorough mixing, the time is 0.5h, the surface-modified glass powder semi-finished slurry is obtained, then the remaining powder is gradually added and stirred uniformly, and then dispersed by a high-speed disperser for 30min to obtain the required coating.

[0049] Table 1

[0050]

[0051] Table 2

[0052]

[0053] Example 1

[0054] A high-temperature-resistant and oxidation-resistant coating for pre-baked anode for reducing energy consumption of aluminum electrolytic cell, comprising the following raw materials by mass percentage:

[0055] Low-melting-point glass powder 150

[0056] Low-melting-point glass powder 25

[0057] Potassium feldspar powder 10

[0058] Talc powder 25

[0059] Boron carbide powder 4

[0060] Aluminum oxide powder 2

[0061] Titanium dioxide powder 1

[0062] Magnesium oxide powder 3

[0063] The coating binder is:

[0064] Silicone 5

[0065] Phosphate resin 100

[0066] Deionized water 5

[0067] Powder: binder = 100:110

[0068] Example 2

[0069] A high-temperature-resistant and oxidation-resistant coating for pre-baked anode for reducing energy consumption of aluminum electrolytic cell, comprising the following raw materials by mass percentage:

[0070] Low-melting-point glass powder 140

[0071] Low-melting-point glass powder 210

[0072] Potassium feldspar powder 5

[0073] Talc powder 30

[0074] Boron carbide powder 5

[0075] Alumina powder 3

[0076] Titanium dioxide powder 2

[0077] Magnesium oxide powder 5

[0078] The paint binder is:

[0079] Organic silicon 8

[0080] Phosphate resin 102

[0081] Deionized water 5

[0082] Powder: binder = 100: 115

[0083] Example 3

[0084] A high-temperature oxidation-resistant coating for pre-baked anodes for reducing the energy consumption of aluminum electrolytic cells, comprising the following raw materials by mass percentage:

[0085] Low-melting-point glass powder 130

[0086] Low-melting-point glass powder 210

[0087] Potassium feldspar powder 20

[0088] Talc powder 20

[0089] Boron carbide powder 10

[0090] Alumina powder 5

[0091] Titanium dioxide powder 2

[0092] Magnesium oxide powder 3

[0093] The paint binder is:

[0094] Organic silicon 10

[0095] Phosphate resin 92

[0096] Deionized water 8

[0097] Powder: binder = 100: 110

[0098] Example 4

[0099] A high-temperature oxidation-resistant coating for pre-baked anodes for reducing the energy consumption of aluminum electrolytic cells, comprising the following raw materials by mass percentage:

[0100] Low-melting-point glass powder 120

[0101] Low melting point glass powder 220

[0102] Potassium feldspar powder 5

[0103] Talc powder 30

[0104] Boron carbide powder 15

[0105] Aluminum oxide powder 5

[0106] Titanium dioxide powder 2

[0107] Magnesium oxide powder 3

[0108] The paint binder is:

[0109] Organic silicon 8

[0110] Modified phosphate resin 97

[0111] Deionized water 10

[0112] Powder: binder = 100: 115

[0113] Example 5

[0114] A high-temperature-resistant and oxidation-resistant coating for pre-baked anodes for reducing the energy consumption of aluminum electrolytic cells, comprising the following raw materials by mass percentage:

[0115] Low melting point glass powder 110

[0116] Low melting point glass powder 225

[0117] Potassium feldspar powder 15

[0118] Talc powder 30

[0119] Boron carbide powder 5

[0120] Aluminum oxide powder 5

[0121] Titanium dioxide powder 5

[0122] Magnesium oxide powder 5

[0123] The paint binder is:

[0124] Organic silicon 5

[0125] Modified phosphate resin 90

[0126] Deionized water 5

[0127] Powder: binder = 100: 100

[0128] 2、Comparative example

[0129] Based on Example 2, the raw materials and process of high-temperature resistant and oxidation-resistant coating were optimized and adjusted, and the change rule of coating performance was explored, as follows:

[0130] Comparative Example 1

[0131] Without low-melting-point glass powder 2, the rest of the composition and preparation method are completely consistent with Example 2, specifically including the following mass percentage of raw materials:

[0132] Low-melting-point glass powder 140

[0133] Low-melting-point glass powder 20

[0134] Potassium feldspar powder 5

[0135] Talc powder 30

[0136] Boron carbide powder 5

[0137] Aluminum oxide powder 3

[0138] Titanium dioxide powder 2

[0139] Magnesium oxide powder 5

[0140] The coating binder is:

[0141] Silicone 8

[0142] Modified phosphate resin 102

[0143] Deionized water 5

[0144] Powder: binder = 100: 115

[0145] Comparative Example 2

[0146] Without talc powder, the rest of the composition and preparation method are completely consistent with Example 2, specifically including the following mass percentage of raw materials:

[0147] Low-melting-point glass powder 140

[0148] Low-melting-point glass powder 210

[0149] Potassium feldspar powder 5

[0150] Talc powder 0

[0151] Boron carbide powder 10

[0152] Aluminum oxide powder 3

[0153] Titanium dioxide powder 2

[0154] Magnesium oxide powder 5

[0155] The coating binder is:

[0156] Silicone 8

[0157] Modified phosphate resin 102

[0158] Deionized water 5

[0159] Powder: binder = 100:115

[0160] Comparative Example 3

[0161] The binder is pure phosphate without modification by adding silicone, and the rest of the composition and preparation method are completely consistent with Example 2, specifically including the following mass percentage of raw materials:

[0162] Low-melting glass powder 140

[0163] Low-melting glass powder 210

[0164] Potassium feldspar powder 5

[0165] Talc powder 30

[0166] Boron carbide powder 5

[0167] Aluminum oxide powder 3

[0168] Titanium dioxide powder 2

[0169] Magnesium oxide powder 5

[0170] Among them, the paint binder is:

[0171] Silicone 0

[0172] Modified phosphate resin 102

[0173] Deionized water 5

[0174] Powder: binder = 100:115

[0175] Comparative Example 4

[0176] Without low-melting glass powder 1, the rest of the composition and preparation method are completely consistent with Example 2, specifically including the following mass percentage of raw materials:

[0177] Low-melting glass powder 10

[0178] Low-melting glass powder 210

[0179] Potassium feldspar powder 5

[0180] Talc powder 30

[0181] Boron carbide powder 5

[0182] Aluminum oxide powder 3

[0183] Titanium dioxide powder 2

[0184] Magnesium oxide powder 5

[0185] Wherein the paint binder is:

[0186] Silicone 8

[0187] Modified phosphate resin 102

[0188] Deionized water 5

[0189] Powder: binder = 100: 115

[0190] Comparative Example 5

[0191] Without boron carbide powder, the rest of the composition and preparation method are exactly the same as Example 2, specifically including the following mass percentage of raw materials:

[0192] Low melting point glass powder 140

[0193] Low melting point glass powder 210

[0194] Potassium feldspar powder 5

[0195] Talc powder 30

[0196] Boron carbide powder 0

[0197] Aluminum oxide powder 3

[0198] Titanium dioxide powder 2

[0199] Magnesium oxide powder 5

[0200] Wherein the paint binder is:

[0201] Silicone 8

[0202] Modified phosphate resin 102

[0203] Deionized water 5

[0204] Powder: binder = 100: 115

[0205] The high-temperature resistant and oxidation resistant paint described in Examples 1-5 and Comparative Examples 1-5 is applied to a carbon substrate to prepare a high-temperature resistant and oxidation resistant coating, and the construction method comprises the following steps:

[0206] (1) Substrate pretreatment

[0207] The surface of the substrate is blown clean by compressed air to remove other impurities and contaminants on the surface;

[0208] (2) Coating

[0209] The coating is evenly coated on the surface of the substrate treated in step (2) by brushing, the top surface and the side surface are brushed first, and the bottom surface is brushed after 1h of surface drying at room temperature, and the sample is surface dried at room temperature for about 1h after brushing.

[0210] The sample prepared in step (2) is dried in an oven at 60℃ for 1h, so as to accelerate the evaporation of water in the coating and prevent blistering and peeling caused by free water in the coating.

[0211] 3. Performance test

[0212] The adhesion of the coating to the substrate and the weight loss of the substrate after high-temperature baking are tested to reflect the oxygen barrier and oxidation resistance of the coating. The samples in the experimental group and the control group are placed in a 900℃ muffle furnace for calcination for 10h, and the adhesion of the coating to the substrate and the weight loss rate of the sample are tested, and the weight loss rate is calculated according to the following formula:

[0213] ;

[0214] Wherein, M1 is the mass before baking, M2 is the mass after baking, and the weight loss rate of the carbon block is as follows:

[0215] Table 3

[0216]

[0217] As can be seen from the experimental data in Table 3, the composition and process of the coating are optimized, the adhesion between the coating and the substrate is perfect, the porosity is low, the coating has good high-temperature resistance and oxidation resistance, especially through modification of the binder resin and proper mixing and compounding of the glass powder, the compatibility between the coating and the substrate is improved, the matching of the thermal expansion coefficient between the coating and the substrate is improved, the adhesion strength of the coating on the substrate surface after film formation is improved, the coating has good high-temperature resistance and oxidation resistance at high temperature, and has certain self-repairing ability, which can repair the micro-cracks of the coating at high temperature and prevent the substrate from contacting with high-temperature air.

[0218] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high temperature resistant and oxidation resistant coating for prebaked anodes for reducing the energy consumption of aluminum electrolysis cells, characterized in that: The components of the coating and their mass percentages are as follows: powder and binder comprising the following weight percentages: The powder composition is as follows: Low-melting glass powder 1 10%-50% Low-melting glass powder 2 5%-25% Potassium feldspar powder 5%-30% Borax powder 20%-60% Boron carbide powder 1.5%-20% Aluminum oxide powder 2%-25% Titanium white powder 1.0-10% Magnesium oxide powder 3%-15% The binder composition is as follows: Organic silicon 2%-15% Phosphate resin 75%-98% Deionized water 5%-10% The powder is as follows: The weight ratio of the binder = 100:100-125 The low-melting glass powder 1 and the low-melting glass powder 2 are both silicon-boron glass powders, wherein the low-melting glass powder 1 has a melting point of 400-700°C, the low-melting glass powder 2 has a melting point of 700-900°C, and the two powders are mixed in a ratio of 4:1-3.

2. The high temperature resistant and oxidation resistant coating for pre-baked anode of aluminum reduction cells according to claim 1, characterized in that: The organic silicon is a polyester-modified organic silicon resin composed of polysiloxane and polyester resin, with a solid content of 55%-65%.

3. The high-temperature oxidation resistant coating for prebaked anodes of claim 1 or 2, characterized in that, The method comprises the following steps: Step 1: Add organic silicon to phosphate resin, wherein the amount of phosphate resin and the amount of organic silicon are 2%-15% and 75%-98% by mass, respectively; Step 2: Mix the low-melting glass powder 1 and the low-melting glass powder 2 into the phosphate resin solution after step 1; Step 3: Put the mixed slurry obtained in step 2 into a high-speed mixer and mix thoroughly for 0.5h, then adjust the viscosity by adding deionized water to form a glass powder slurry; Step 4: Weigh the powder according to claim 1, except for the glass powder; Step 5: Mix the powder with the slurry, mix the powder other than the glass powder in claim 1 with the glass powder slurry obtained in step 3, add an appropriate amount of deionized water, and put it into a high-speed dispersing machine for stirring and dispersing for 30min; Step 6: Filter the coating, filter the slurry obtained in step 5 through a filter screen to obtain the final coating product.

4. Use of a high-temperature resistant and oxidation resistant coating for prebaked anodes for reducing the energy consumption of an aluminum electrolysis cell according to any one of claims 1 to 3, characterized in that: It is applied to the surface of electrolytic aluminum pre-baked anode to play a role in high-temperature oxidation resistance, or applied to the surface of steel ladle and continuous casting three-piece in smelting plant for high-temperature oxidation resistance protection.

5. The use of a high-temperature oxidation-resistant coating for prebaked anodes for reducing the energy consumption of an aluminum electrolysis cell according to claim 4, characterized in that: The coating is applied to the top and side of the pre-baked anode carbon block by spraying or brushing, and then stored in a normal temperature and ventilated environment for 1.5-2 hours before use.

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