Recovery and cyclic utilization method for electrolytic aluminum anode covering waste

Abstract

The invention relates to the technical field of electrolytic aluminum, and provides an electrolytic aluminum anode covering waste recovery and cyclic utilization method which comprises the following steps: separating and crushing electrolytic aluminum anode covering waste to obtain an anode covering fine material; carrying out flotation on the fine anode covering material to obtain a first flotation product and a second flotation product which respectively contain cryolite and aluminum oxide; the first flotation product is subjected to leaching and filtering treatment, cleaning treatment, extraction treatment and drying treatment, and a cryolite recovery product is obtained; the second flotation product is subjected to leaching and precipitation treatment, cleaning treatment and drying treatment, and an aluminum oxide recovery product is obtained; the novel electrolytic aluminum anode covering material is obtained by preparing an adhesive and mixing the adhesive with a cryolite recovery product and an aluminum oxide recovery product, and can be used for accurately and comprehensively separating, extracting and recovering effective components of cryolite and aluminum oxide of electrolytic aluminum anode covering waste materials, so that the use cost of cryolite and aluminum oxide in the production process of electrolytic aluminum is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic aluminum, and in particular to a method for recycling and cyclically utilizing electrolytic aluminum anode covering waste. Background Art

[0002] The electrolytic aluminum anode covering material is a covering material formed by a mixture of cryolite and alumina. It covers the surface of the electrolytic aluminum anode, seals and protects the electrolytic aluminum anode, reduces the oxidation degree of the electrolytic aluminum anode, reduces the iron-carbon pressure drop, and globally insulates the electrolytic aluminum anode. The cryolite and alumina of the electrolytic aluminum anode covering material will not undergo reaction modification during the electrolytic aluminum process, but will peel off from the surface of the electrolytic aluminum anode and mix with the electrolyte in the electrolytic cell to form electrolytic aluminum anode covering waste. In the actual production process, the electrolytic aluminum anode covering waste will be directly discarded, resulting in a huge waste of cryolite and alumina. In addition, the use cost of cryolite in the aluminum electrolysis process is high. Directly discarding the electrolytic aluminum anode covering waste will not only cause environmental pollution, but also cause a large amount of cryolite and alumina waste, increasing the production cost of electrolytic aluminum. Therefore, how to recycle, separate and recycle the electrolytic aluminum anode covering waste is of great significance to reducing the environmental pollution caused by electrolytic aluminum production and the production cost of electrolytic aluminum. Summary of the invention

[0003] In view of the defects of the prior art, the present invention provides a method for recycling and reusing electrolytic aluminum anode covering waste, which comprises separating and crushing the electrolytic aluminum anode covering waste to obtain anode covering material fines, and flotating the anode covering material fines to obtain a first flotation product and a second flotation product containing cryolite and alumina, respectively; subjecting the first flotation product to leaching and filtering, cleaning, extracting and drying to obtain a cryolite recovery product; subjecting the second flotation product to leaching and precipitation, cleaning and drying to obtain an alumina recovery product; preparing an adhesive, and mixing the adhesive with the cryolite recovery product and the alumina recovery product to obtain a new electrolytic aluminum anode covering material, which can accurately and comprehensively separate and extract and recover the effective components of cryolite and alumina in the electrolytic aluminum anode covering waste, and remaking the cryolite and alumina into electrolytic aluminum anode covering material, thereby improving the reuse rate of cryolite and alumina and reducing the use cost of cryolite and alumina in the electrolytic aluminum production process.

[0004] The present invention provides a method for recycling and cyclically utilizing electrolytic aluminum anode covering waste, comprising the following steps: Step S1, separating and crushing the electrolytic aluminum anode covering waste to obtain anode covering material fines; flotation treating the anode covering material fines to obtain a first flotation product and a second flotation product; wherein the first flotation product mainly includes cryolite, and the second flotation product mainly includes alumina; Step S2, performing leaching and filtering treatment on the first flotation product to obtain a first filter residue product; performing washing treatment and extraction treatment on the first filter residue product to obtain a cryolite extract; and then performing drying treatment on the cryolite extract to obtain a cryolite recovery product; Step S3, leaching and precipitating the second flotation product to obtain a second filter residue product; washing and drying the second filter residue product to obtain an alumina recovery product; Step S4, preparing an adhesive, and uniformly mixing the cryolite recovery product, the alumina recovery product and the adhesive according to a preset weight ratio to obtain a new electrolytic aluminum anode covering material.

[0005] In one embodiment disclosed in the present application, in step S1, the electrolytic aluminum anode covering waste is separated and crushed to obtain anode covering material fines, including: After the electrolytic aluminum anode covering waste is treated to remove iron impurities and carbon impurities, the electrolytic aluminum anode covering waste is crushed to obtain anode covering material fine material; wherein the average particle size of the anode covering material fine material is 200-300 meshes.

[0006] In one embodiment disclosed in the present application, in step S1, the electrolytic aluminum anode covering waste is subjected to a treatment for removing iron impurities and carbon impurities, including: Placing the electrolytic aluminum anode cover scrap in a strong magnetic field environment to adsorb and remove iron impurities; wherein the magnetic field strength of the strong magnetic field environment is greater than or equal to 2000 Gauss; The electrolytic aluminum anode covering waste is then placed in a high-temperature furnace, and oxygen is supplied to the interior of the high-temperature furnace to burn and remove carbon impurities in the electrolytic aluminum anode covering waste; wherein the flow rate of oxygen supplied to the interior of the high-temperature furnace is not less than 2L / min.

[0007] In one embodiment disclosed in the present application, in the step S1, the anode cover material fine material is subjected to flotation treatment to obtain a first flotation product and a second flotation product, including: The anode covering material fine material and water are uniformly mixed in a weight ratio of 10-20:8-10 to obtain an anode covering material slurry; a flotation agent is then added to the anode covering material slurry to perform a flotation treatment on the anode covering material fine material to obtain a first flotation product and a second flotation product; wherein the flotation agent comprises a pH regulator, a collector and an inhibitor; the pH regulator comprises sodium carbonate and / or sodium hydroxide; the collector comprises sodium linoleate or potassium oleate; the inhibitor comprises sodium carboxymethyl cellulose or sodium methylene bisnaphthalene sulfonate.

[0008] In one embodiment disclosed in the present application, in the step S2, the first flotation product is subjected to leaching and filtration treatment to obtain a first filter residue product, including: The first flotation product, water and hexanol are uniformly mixed in a weight ratio of 1000-2000:10000-30000:30-50 to prepare a first leaching solution; a corresponding amount of hydrochloric acid is added to the first leaching solution so that the pH value of the first leaching solution becomes 5-6; The first leaching solution is heated and stirred to cause solid-liquid separation in the first leaching solution; the first leaching solution is filtered to extract solid matter precipitated in the first leaching solution, thereby obtaining a first filter residue product.

[0009] In one embodiment disclosed in the present application, in the step S2, the first filter residue product is cleaned and extracted to obtain a cryolite extract; and the cryolite extract is dried to obtain a cryolite recovery product, including: The first filter residue product is subjected to repeated water washing treatment and extraction treatment alternately for multiple times to obtain a cryolite extract; and the cryolite extract is then subjected to hot air drying treatment to obtain a cryolite recovery product.

[0010] In one embodiment disclosed in the present application, in the step S3, the second flotation product is subjected to leaching and precipitation treatment to obtain a second filter residue product, including: The second flotation product, water and sodium carbonate are uniformly mixed in a weight ratio of 1000-2000:10000-30000:10-20 to prepare a second leaching solution; the second leaching solution is heated and subjected to static precipitation treatment to allow solid-liquid separation to occur in the second leaching solution; The second leaching solution is then filtered to extract the solid matter precipitated inside the second leaching solution, thereby obtaining a second filter residue product.

[0011] In one embodiment disclosed in the present application, in the step S3, the second filter residue product is cleaned and dried to obtain an alumina recovery product, including: The second filter residue product is repeatedly subjected to water washing treatment for multiple times to obtain a filter residue extract; and the filter residue extract is then subjected to hot air drying treatment to obtain an aluminum oxide recovery product.

[0012] In one embodiment disclosed in the present application, in step S4, preparing an adhesive comprises: Aluminum dihydrogen phosphate, fluorite powder, water glass and water are uniformly mixed in a weight ratio of 40-60:10-20:10-25:5-30 to prepare an adhesive.

[0013] In one embodiment disclosed in the present application, in the step S4, the cryolite recovery product, the alumina recovery product and the binder are uniformly mixed according to a preset weight ratio to obtain a new electrolytic aluminum anode covering material, including: The cryolite recovery product, the alumina recovery product and the adhesive are uniformly mixed in a weight ratio of 5-10:5-10:3-5 within a temperature range of 30°C-40°C to obtain a new electrolytic aluminum anode covering material.

[0014] Compared with the prior art, the method for recycling and reusing waste electrolytic aluminum anode coverings separates and crushes the waste electrolytic aluminum anode coverings to obtain fine anode covering materials, and flots the fine anode covering materials to obtain a first flotation product and a second flotation product containing cryolite and alumina, respectively; the first flotation product is subjected to leaching and filtration treatments, cleaning treatments, extraction treatments, and drying treatments to obtain a cryolite recovery product; the second flotation product is subjected to leaching and precipitation treatments, cleaning treatments, and drying treatments to obtain an alumina recovery product; an adhesive is prepared and mixed with the cryolite recovery product and the alumina recovery product to obtain a new electrolytic aluminum anode covering material, which can accurately and comprehensively separate and extract and recover the effective components of cryolite and alumina in the waste electrolytic aluminum anode coverings, and remake the cryolite and alumina into electrolytic aluminum anode covering materials, thereby increasing the reuse rate of cryolite and alumina and reducing the use cost of cryolite and alumina in the electrolytic aluminum production process.

[0015] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1A schematic flow chart of the method for recycling and reusing electrolytic aluminum anode covering waste provided by the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1 , is a schematic flow chart of a method for recycling and reusing electrolytic aluminum anode covering waste provided by an embodiment of the present invention. The method for recycling and reusing electrolytic aluminum anode covering waste comprises: Step S1, separating and crushing the electrolytic aluminum anode covering waste to obtain anode covering material fines; flotation treatment of the anode covering fines to obtain a first flotation product and a second flotation product; wherein the first flotation product mainly includes cryolite, and the second flotation product mainly includes alumina; Step S2, performing leaching and filtering treatment on the first flotation product to obtain a first filter residue product; performing washing treatment and extraction treatment on the first filter residue product to obtain a cryolite extract; and then performing drying treatment on the cryolite extract to obtain a cryolite recovery product; Step S3, leaching and precipitating the second flotation product to obtain a second filter residue product; washing and drying the second filter residue product to obtain an alumina recovery product; Step S4, preparing an adhesive, and uniformly mixing the cryolite recovery product, the alumina recovery product and the adhesive according to a preset weight ratio to obtain a new electrolytic aluminum anode covering material.

[0021] The method for recycling and reusing waste electrolytic aluminum anode coverings performs separation and crushing treatments on the waste electrolytic aluminum anode coverings to obtain fine anode covering materials, and flotation obtains a first flotation product and a second flotation product respectively containing cryolite and alumina from the fine anode covering materials; performs leaching and filtering treatments, cleaning treatments, extraction treatments, and drying treatments on the first flotation product to obtain a cryolite recovery product; performs leaching and precipitation treatments, cleaning treatments, and drying treatments on the second flotation product to obtain an alumina recovery product; prepares an adhesive, and mixes the adhesive with the cryolite recovery product and the alumina recovery product to obtain a new electrolytic aluminum anode covering material, which can accurately and comprehensively separate and extract and recycle the effective components of cryolite and alumina in the waste electrolytic aluminum anode coverings, and remakes the cryolite and alumina into electrolytic aluminum anode covering materials, thereby increasing the reuse rate of cryolite and alumina and reducing the use cost of cryolite and alumina in the electrolytic aluminum production process.

[0022] Preferably, in step S1, the electrolytic aluminum anode covering waste is separated and crushed to obtain anode covering material fines, including: After the electrolytic aluminum anode covering waste is treated to remove iron impurities and carbon impurities, the electrolytic aluminum anode covering waste is crushed to obtain anode covering material fines; wherein the average particle size of the anode covering material fines is 200-300 meshes.

[0023] In the above technical scheme, the electrolytic aluminum anode covering waste is formed when the electrolytic aluminum anode covering material falls off from the anode and enters the electrolytic cell and is mixed with the electrolyte inside the electrolytic cell, so that the electrolytic aluminum anode covering waste is not only doped with the carbon material of the anode itself, but also doped with the iron component in the electrolyte, resulting in the widespread distribution of iron impurities and carbon impurities inside the electrolytic aluminum anode covering waste. In order to ensure that the iron impurities and carbon impurities inside the electrolytic aluminum anode covering waste can be completely removed in the future, the electrolytic aluminum anode covering waste is first crushed and crushed to obtain anode covering material fines with an average particle size of 200-300 mesh, which can ensure the subsequent fine removal of iron impurities and carbon impurities.

[0024] Preferably, in step S1, the electrolytic aluminum anode covering waste is subjected to a treatment for removing iron impurities and carbon impurities, comprising: Placing the electrolytic aluminum anode covering waste in a strong magnetic field environment to adsorb and remove iron impurities; wherein the magnetic field intensity of the strong magnetic field environment is greater than or equal to 2000 Gauss; The electrolytic aluminum anode covering waste is then placed in a high-temperature furnace, and oxygen is supplied to the interior of the high-temperature furnace to burn and remove carbon impurities in the electrolytic aluminum anode covering waste; wherein the flow rate of oxygen supplied to the interior of the high-temperature furnace is not less than 2L / min.

[0025] In the above technical solution, in order to prevent iron impurities from affecting the recovery of cryolite and alumina, the magnetic characteristics of iron impurities are utilized to first place the electrolytic aluminum carbon slag in a strong magnetic field environment and stir the electrolytic aluminum carbon slag at a uniform speed, so that the tiny iron impurities widely distributed inside the electrolytic aluminum carbon slag can be fully exposed to the strong magnetic field environment, thereby adsorbing and removing all iron impurities from the electrolytic aluminum carbon slag; wherein the magnetic field intensity of the strong magnetic field environment is greater than or equal to 2000 Gauss, and the duration of the iron impurity adsorption and removal treatment is not less than 30 minutes, so that the iron impurities can be completely adsorbed and iron impurities can be avoided from remaining in the electrolytic aluminum anode covering waste. There is also the electrolytic aluminum anode covering waste placed in a high-temperature furnace, oxygen is transported into the high-temperature furnace, and the carbon impurities inside the electrolytic aluminum anode covering waste are burned and removed, so as to achieve full combustion and removal of the carbon impurities inside the electrolytic aluminum anode covering waste.

[0026] Preferably, in step S1, the anode cover material fine material is subjected to flotation treatment to obtain a first flotation product and a second flotation product, including: The anode covering material fine material and water are uniformly mixed in a weight ratio of 10-20:8-10 to obtain an anode covering material slurry; a flotation agent is then added to the anode covering material slurry to perform a flotation treatment on the anode covering material fine material to obtain a first flotation product and a second flotation product; wherein the flotation agent includes a pH regulator, a collector and an inhibitor; the pH regulator includes sodium carbonate and / or sodium hydroxide; the collector includes sodium linoleate or potassium oleate; the inhibitor includes sodium carboxymethyl cellulose or sodium methylene bisnaphthalene sulfonate.

[0027] In the above technical scheme, the anode covering material fine material and water are uniformly mixed in a weight ratio of 10-20:8-10 to obtain an anode covering material slurry, and then a flotation agent is added to the anode covering material slurry to perform flotation treatment on the anode covering material fine material. In this way, cryolite and alumina in the anode covering material fine material can be differentiated by flotation treatment to obtain a first flotation product and a second flotation product, thereby realizing subsequent targeted purification and recovery of cryolite and alumina.

[0028] Preferably, in step S2, the first flotation product is subjected to leaching and filtration treatment to obtain a first filter residue product, comprising: The first flotation product, water and hexanol are uniformly mixed in a weight ratio of 1000-2000:10000-30000:30-50 to prepare a first leaching solution; a corresponding amount of hydrochloric acid is added to the first leaching solution so that the pH value of the first leaching solution becomes 5-6; The first leaching solution is heated and stirred to cause solid-liquid separation inside the first leaching solution; the first leaching solution is then filtered to extract solid matter precipitated inside the first leaching solution, thereby obtaining a first filter residue product.

[0029] In the above technical solution, the first flotation product, water, and hexanol are uniformly mixed in a weight ratio of 1000-2000:10000-30000:30-50 to prepare a first leaching solution, and a corresponding amount of hydrochloric acid is added to the first leaching solution so that the pH value of the first leaching solution becomes 5-6, so that the interior of the first leaching solution gradually becomes an acidic environment, and the first leaching solution is heated and stirred so that solid-liquid separation occurs inside the first leaching solution, and the cryolite component therein gradually settles at the bottom of the solution. The first leaching solution is then filtered to extract the solid matter precipitated inside the first leaching solution to achieve the extraction of cryolite.

[0030] Preferably, in step S2, the first filter residue product is subjected to a washing treatment and an extraction treatment to obtain a cryolite extract; and the cryolite extract is then subjected to a drying treatment to obtain a cryolite recovery product, comprising: The first filter residue product is repeatedly subjected to water washing treatment and extraction treatment alternately for multiple times to obtain a cryolite extract; and the cryolite extract is then subjected to hot air drying treatment to obtain a cryolite recovery product.

[0031] In the above technical scheme, the first filter residue product is repeatedly subjected to multiple water washing treatments and extraction treatments alternately to obtain cryolite extract, and then the cryolite extract is subjected to hot air drying to obtain cryolite recovery product, thereby increasing the product amount of cryolite recovery product.

[0032] Preferably, in step S3, the second flotation product is subjected to leaching and precipitation treatment to obtain a second filter residue product, comprising: The second flotation product, water and sodium carbonate are uniformly mixed in a weight ratio of 1000-2000:10000-30000:10-20 to prepare a second leaching solution; the second leaching solution is heated and subjected to static precipitation treatment to allow solid-liquid separation to occur inside the second leaching solution; The second leaching solution is then filtered to extract the solid matter precipitated inside the second leaching solution, thereby obtaining a second filter residue product.

[0033] In the above technical scheme, the second flotation product, water and sodium carbonate are uniformly mixed in a weight ratio of 1000-2000:10000-30000:10-20 to prepare a second leaching solution; the second leaching solution is heated and allowed to settle so that solid-liquid separation occurs inside the second leaching solution; the second leaching solution is filtered to extract the solid matter precipitated inside the second leaching solution, thereby realizing the extraction of aluminum oxide.

[0034] Preferably, in step S3, the second filter residue product is cleaned and dried to obtain an alumina recovery product, comprising: The second filter residue product is repeatedly subjected to water washing treatment for multiple times to obtain a filter residue extract; the filter residue extract is then subjected to hot air drying treatment to obtain an aluminum oxide recovery product.

[0035] In the above technical scheme, the second filter residue product is repeatedly washed with water for multiple times to obtain a filter residue extract, and then the filter residue extract is dried with hot air to obtain an alumina recovery product, which can increase the product amount of the alumina recovery product.

[0036] Preferably, in step S4, preparing an adhesive comprises: Aluminum dihydrogen phosphate, fluorite powder, water glass and water are uniformly mixed in a weight ratio of 40-60:10-20:10-25:5-30 to prepare an adhesive.

[0037] In the above technical scheme, aluminum dihydrogen phosphate, fluorite powder, water glass and water are uniformly mixed in a weight ratio of 40-60:10-20:10-25:5-30 to form an adhesive, which can improve the adhesion of the adhesive, effectively bond cryolite and oxide, and improve the physical structure continuity of the electrolytic aluminum anode covering material.

[0038] Preferably, in step S4, the cryolite recovery product, the alumina recovery product and the binder are uniformly mixed according to a preset weight ratio to obtain a new electrolytic aluminum anode covering material, comprising: The cryolite recovery product, the alumina recovery product and the binder are uniformly mixed in a weight ratio of 5-10:5-10:3-5 within a temperature range of 30°C-40°C to obtain a new electrolytic aluminum anode covering material.

[0039] In the above technical scheme, the cryolite recovery product, the alumina recovery product and the adhesive are uniformly mixed in a weight ratio of 5-10:5-10:3-5 within a temperature range of 30°C-40°C to obtain a new electrolytic aluminum anode covering material, which can increase the reuse rate of cryolite and alumina and reduce the use cost of cryolite and alumina in the electrolytic aluminum production process.

[0040] It can be seen from the contents of the above embodiments that the method for recycling and reusing electrolytic aluminum anode covering waste separates and crushes the electrolytic aluminum anode covering waste to obtain anode covering material fines, and flots the anode covering material fines to obtain a first flotation product and a second flotation product containing cryolite and alumina, respectively; the first flotation product is subjected to leaching and filtration treatments, cleaning treatments, extraction treatments, and drying treatments to obtain a cryolite recovery product; the second flotation product is subjected to leaching and precipitation treatments, cleaning treatments, and drying treatments to obtain an alumina recovery product; a binder is prepared and mixed with the cryolite recovery product and the alumina recovery product to obtain a new electrolytic aluminum anode covering material, which can accurately and comprehensively separate and extract and recover the effective components of cryolite and alumina in the electrolytic aluminum anode covering waste, and remake cryolite and alumina into electrolytic aluminum anode covering material, thereby improving the reuse rate of cryolite and alumina and reducing the use cost of cryolite and alumina in the electrolytic aluminum production process.

[0041] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for recycling and reusing electrolytic aluminum anode covering waste, characterized in that: It includes the following steps: Step S1, separating and crushing the electrolytic aluminum anode covering waste to obtain anode covering material fines; flotation treating the anode covering material fines to obtain a first flotation product and a second flotation product; wherein the first flotation product mainly includes cryolite, and the second flotation product mainly includes alumina; Step S2, performing leaching and filtering treatment on the first flotation product to obtain a first filter residue product; performing washing treatment and extraction treatment on the first filter residue product to obtain a cryolite extract; and then performing drying treatment on the cryolite extract to obtain a cryolite recovery product; Step S3, leaching and precipitating the second flotation product to obtain a second filter residue product; washing and drying the second filter residue product to obtain an alumina recovery product; Step S4, preparing an adhesive, and uniformly mixing the cryolite recovery product, the alumina recovery product and the adhesive according to a preset weight ratio to obtain a new electrolytic aluminum anode covering material.

2. The method for recycling and reusing electrolytic aluminum anode cover waste according to claim 1, characterized in that: In the step S1, the electrolytic aluminum anode covering waste is separated and crushed to obtain anode covering material fines, including: After the electrolytic aluminum anode covering waste is treated to remove iron impurities and carbon impurities, the electrolytic aluminum anode covering waste is crushed to obtain anode covering material fine material; wherein the average particle size of the anode covering material fine material is 200-300 meshes.

3. The method for recycling and reusing electrolytic aluminum anode cover waste according to claim 2, characterized in that: In the step S1, the electrolytic aluminum anode covering waste is subjected to a treatment for removing iron impurities and carbon impurities, including: Placing the electrolytic aluminum anode cover scrap in a strong magnetic field environment to adsorb and remove iron impurities; wherein the magnetic field strength of the strong magnetic field environment is greater than or equal to 2000 Gauss; The electrolytic aluminum anode covering waste is then placed in a high-temperature furnace, and oxygen is supplied to the interior of the high-temperature furnace to burn and remove carbon impurities in the electrolytic aluminum anode covering waste; wherein the flow rate of oxygen supplied to the interior of the high-temperature furnace is not less than 2L / min.

4. The method for recycling and reusing electrolytic aluminum anode cover waste according to claim 3, characterized in that: In the step S1, the anode cover material fine material is subjected to flotation treatment to obtain a first flotation product and a second flotation product, including: The anode covering material fine material and water are uniformly mixed in a weight ratio of 10-20:8-10 to obtain an anode covering material slurry; a flotation agent is then added to the anode covering material slurry to perform a flotation treatment on the anode covering material fine material to obtain a first flotation product and a second flotation product; wherein the flotation agent comprises a pH regulator, a collector and an inhibitor; the pH regulator comprises sodium carbonate and / or sodium hydroxide; the collector comprises sodium linoleate or potassium oleate; the inhibitor comprises sodium carboxymethyl cellulose or sodium methylene bisnaphthalene sulfonate.

5. The method for recycling and reusing electrolytic aluminum anode cover waste according to claim 1, characterized in that: In the step S2, the first flotation product is subjected to leaching and filtration treatment to obtain a first filter residue product, including: The first flotation product, water and hexanol are uniformly mixed in a weight ratio of 1000-2000:10000-30000:30-50 to prepare a first leaching solution; a corresponding amount of hydrochloric acid is added to the first leaching solution so that the pH value of the first leaching solution becomes 5-6; The first leaching solution is heated and stirred to cause solid-liquid separation in the first leaching solution; the first leaching solution is filtered to extract solid matter precipitated in the first leaching solution, thereby obtaining a first filter residue product.

6. The method for recycling and reusing electrolytic aluminum anode cover waste according to claim 5, characterized in that: In the step S2, the first filter residue product is cleaned and extracted to obtain a cryolite extract; and the cryolite extract is dried to obtain a cryolite recovery product, including: The first filter residue product is subjected to repeated water washing treatment and extraction treatment alternately for multiple times to obtain a cryolite extract; and the cryolite extract is then subjected to hot air drying treatment to obtain a cryolite recovery product.

7. The method for recycling and reusing electrolytic aluminum anode cover waste according to claim 1, characterized in that: In the step S3, the second flotation product is subjected to leaching and precipitation treatment to obtain a second filter residue product, including: The second flotation product, water and sodium carbonate are uniformly mixed in a weight ratio of 1000-2000:10000-30000:10-20 to prepare a second leaching solution; the second leaching solution is heated and subjected to static precipitation treatment to allow solid-liquid separation to occur in the second leaching solution; The second leaching solution is then filtered to extract the solid matter precipitated inside the second leaching solution, thereby obtaining a second filter residue product.

8. The method for recycling and reusing electrolytic aluminum anode cover waste according to claim 7, characterized in that: In the step S3, the second filter residue product is cleaned and dried to obtain an aluminum oxide recovery product, including: The second filter residue product is repeatedly subjected to water washing treatment for multiple times to obtain a filter residue extract; and the filter residue extract is then subjected to hot air drying treatment to obtain an aluminum oxide recovery product.

9. The method for recycling and reusing electrolytic aluminum anode cover waste according to claim 1, characterized in that: In step S4, preparing an adhesive includes: Aluminum dihydrogen phosphate, fluorite powder, water glass and water are uniformly mixed in a weight ratio of 40-60:10-20:10-25:5-30 to prepare an adhesive.

10. The method for recycling and reusing electrolytic aluminum anode cover waste according to claim 9, characterized in that: In the step S4, the cryolite recovery product, the alumina recovery product and the binder are uniformly mixed according to a preset weight ratio to obtain a new electrolytic aluminum anode covering material, including: The cryolite recovery product, the alumina recovery product and the adhesive are uniformly mixed in a weight ratio of 5-10:5-10:3-5 within a temperature range of 30°C-40°C to obtain a new electrolytic aluminum anode covering material.

Images