75 results about "Bayer process" patented technology

The invention belongs to the technical field of metallurgy, and discloses a hydrogen reduction dissolution method for bauxite. Comprising the following steps: mixing bauxite and circulating mother liquor to form raw ore pulp, adding a reducing agent, and performing Bayer process reduction dissolution; the reducing agent is hydrogen. According to the method, impurity-free and low-energy-consumption efficient dissolution is realized by introducing the gas-phase reducing agent hydrogen, red mud discharge is reduced from the source, and the recovery rate of valuable components is increased.

The invention discloses a method for removing organic matters in an aluminum oxide solution produced by a Bayer process, which comprises the following steps: mixing evaporated discharged materials with biogas residues produced by biological gas production, stirring and adsorbing, and carrying out solid-liquid separation to obtain an adsorbed solution without the organic matters. The method disclosed by the invention can efficiently absorb organic matters in the sodium aluminate solution, effectively reduce negative effects of the organic matters on a production process, product quality and the like, greatly reduce foam of a decomposition tank, remarkably improve filtering and washing effects, reduce seed refinement, enable an aluminum oxide product to meet quality requirements, effectively improve the quality of the aluminum oxide product and reduce energy consumption; the production efficiency is improved, the production cost is reduced, the stability and sustainability of the production system process are enhanced, and the market competitiveness of products is improved.

The invention relates to the technical field of comprehensive utilization of colored industrial solid wastes, in particular to a method for selecting iron from Bayer process high-iron red mud. The method comprises the following steps: carrying out pre-screening and size mixing treatment on the Bayer process high-iron red mud to obtain mixed ore pulp; carrying out gradient magnetic separation on the mixed ore pulp to obtain first iron ore concentrate, magnetic separation tailings and multiple groups of magnetic separation concentrates; the magnetic separation concentrates are sequentially combined and graded, and coarse-fraction iron ore concentrates and fine-fraction iron ore concentrates are obtained; dividing the coarse-fraction iron ore concentrate to obtain a first group of coarse-fraction iron ore concentrate and a second group of coarse-fraction iron ore concentrate; mixing the first group of coarse-fraction iron ore concentrate with the magnetic separation tailings to obtain mixed mineral aggregate; the mixed mineral aggregate is separated again, and separated iron ore concentrate is obtained; and combining various iron ore concentrates to obtain second iron ore concentrates. According to the method, the grade and the recovery rate of the iron ore concentrate are synchronously improved through the synergistic effect of multi-section combined magnetic separation, material circulation re-separation and size grading optimization.

The application provides a method for full resource recycling of Bayer process red mud, valuable elements such as aluminum, iron, calcium, silicon and gallium in the red mud are leached into a solution, main elements (aluminum, iron, calcium and silicon) are separated first to obtain industrial products such as iron ore powder, silica gel, gypsum and water purifying agent, and gallium elements are enriched, gallium is separated and extracted from the solution through extraction, the purpose of full resource recycling of the Bayer process red mud is achieved, high concentration enrichment of the gallium elements is realized, valuable elements are not wasted, and the method has the advantages of less interference factors, high extraction efficiency, saved extraction agent and back extraction agent.

Method for producing a chemically and physically stable, neutral, non-saline inorganic product from bauxite residues (1), comprising the steps of: (i) providing (1100) a washed and thickened bauxite residue (1), (ii) in a so-called acidification step (1200), reacting the washed and thickened bauxite residue (1) with a sufficient quantity of a monoprotic Bron sled acid (10) to achieve a final target pH between 5.5 and 8.5 at an addition rate such that the pH never drops below a value of 3.0, (iii) in a so-called separation step (1300), separating soluble reaction products from the remaining solids( 7), (iv) in a so-called post-acidification washing step (1400), washing the remaining solids (7) obtained in the separation step with a washing liquid (17). Said product (21) can be used as a growth medium or soil for growing plants, in pure form or in mixture with natural soil materials of geological or biological origin.

The utility model provides a system for treating low-temperature Bayer process red mud, and relates to the field of solid waste recycling. Comprising Bayer process low-temperature red mud, a composite additive, a weighing device and a dissolver, the dissolver is communicated with a dilution tank, the dilution tank is communicated with a filter unit, the filter unit is respectively communicated with a multi-stage washing device and a seed crystal decomposition tank, the multi-stage washing device is communicated with a drying device, and the drying device is communicated with a first warehouse; the seed crystal decomposition tank is communicated with a filter, the filter is respectively communicated with an evaporation concentration device and a roasting furnace, the roasting furnace is communicated with a second warehouse, and the evaporation concentration device is communicated with a dissolver; according to the utility model, the iron-calcium composite additive is adopted as a main reaction auxiliary agent and is subjected to accurate proportioning and directional reaction with the high-iron guineite bauxite, aluminum and sodium which are lost in secondary reaction and enter the red mud are separated and recovered in the dissolution process, and the red mud is converted into an iron ore concentrate powder product in the production process, so that the efficient separation and utilization of aluminum and iron are realized; the method is energy-saving, environment-friendly, low in cost and remarkable in economic benefit and environmental benefit.

The invention belongs to the technical field of metallurgical slag resource utilization, and particularly relates to a nickel smelting slag recycling process. Comprising the following steps: mixing and drying stainless steel pickling sludge, Bayer process red mud and coke powder to prepare iron-containing coke powder; setting a slag pot position and a spray gun position; when the molten nickel smelting slag falls down, iron-containing coke powder is sprayed out at a constant speed through argon by using a spray gun, the molten nickel smelting slag is blown away, and then a reduction reaction is carried out; a fluxing agent is added into the reduced molten nickel smelting slag, then vacuumizing is conducted, magnesium is reduced and evaporated, magnesium steam is collected and cooled, and elementary substance magnesium and magnesium-removed molten nickel smelting slag are obtained; coke powder and metal carbide powder are added into the magnesium-removed molten nickel smelting slag, cooling is conducted after reaction, reaction materials are taken to be crushed, ground and magnetically separated, Fe-Ni-Cr enriched alloy is obtained and used for a steel plant, remaining materials are used as aggregate in a cement plant, the production process is simple, the recovery process is short, energy consumption of equipment can be greatly reduced, and the metal recovery rate is increased.

This invention provides a method for treating red mud, comprising the following steps: First, red mud slurry from an aluminum plant is fed into a red mud storage tank, filtered to obtain an alkaline solution and red mud filter cake. The alkaline solution is returned to the aluminum plant, and the red mud filter cake is mixed with additives to form a red mud mixture. Second, the red mud mixture is fed into an electromagnetic rotary kiln for calcination. Within the electromagnetic rotary kiln, from the inlet to the outlet, the temperature varies in different sections: the first section is 25-600℃, the second section is 600-800℃, the third and fourth sections are 800-1000℃, and the fifth section is below 100℃. Third, the output material from the electromagnetic rotary kiln is subjected to dry magnetic separation. The magnetic separation includes two stages: the first stage involves weak magnetic separation of the cooled material to obtain iron concentrate powder and the first tailings; the second stage involves strong magnetic separation of the first tailings to obtain middlings and tailings. The middlings are titanium dioxide, and the tailings are geopolymers. This invention achieves zero-emission standards for the entire production process, has low production investment costs, and is easily compatible with the Bayer process in China.

Provided herein are methods and systems for producing alumina trihydrate (Al(OH)3) and / or alumina (Al2O3). The methods and systems utilize energy extracted from the aluminum-water reaction to power the conversion of various aluminum sources to alumina trihydrate.

The present application relates to the field of environmental protection material and carbon capture technology, in particular to a kind of red mud-based carbon dioxide capture adsorbent and its preparation method.It is composed of the following components by weight: activated red mud 60~80 parts;Alkali metal modification component 15~30 parts;Porous carrier 5~10 parts;Binder 3~8 parts;Auxiliary activator 2~5 parts.Activated red mud is obtained by removing iron from bayer process red mud by magnetic separation to iron content≤5wt%, then drying, calcining and crushing.The preparation method includes raw material pretreatment, mixing and dispersion, molding, activation and cooling.The obtained adsorbent has a static adsorption capacity for CO2≥2.8mmol / g, a 20-cycle retention rate≥90%, a compressive strength≥8MPa, and a raw material cost of 800~1200 yuan / t, realizing high-value utilization of red mud and low-cost carbon capture, and being suitable for flue gas CO2 capture in power generation, steel, coal chemical industry and other industries.

The invention relates to the technical field of waste heat recovery of Bayer process aluminum oxide production, in particular to a seven-effect five-flash condensate water waste heat grading system and an aluminum oxide production device. According to the system, the first-effect condensate water and the second-effect condensate water are divided into two independent loops according to the thought of'temperature alignment and stepped recovery ', namely the first-effect condensate water and the second-effect condensate water, and the condensate water cooled by the two loops finally converges into the same recovery tank and then is pumped back to a boiler or a deaerator. Due to the fact that heat needed by the stock solution, the washing water and the secondary steam condensate water is all borne by original directly-discharged first-effect waste heat and second-effect waste heat, the amount of new steam needing to be supplemented by the evaporator is correspondingly reduced. And meanwhile, the first-effect heat transfer temperature difference of the evaporator is reduced, the system can maintain the seven-effect total temperature difference under the lower new steam pressure, and closed-loop energy saving of replacing new steam with waste heat is achieved.

This invention relates to a method and system for the combined processing of Bayer process red mud and low-grade bauxite. The method includes: separately detecting the aluminum and silicon content in the red mud and bauxite, mixing the red mud and bauxite according to the detection results to achieve an aluminum-to-silicon ratio greater than 1 in the resulting raw material, adding a calcination aid, and calcining to obtain clinker. The clinker undergoes multiple cycles of water leaching and primary desilication treatment until the aluminum-to-silicon ratio in the solution is greater than 300 and the vanadium content reaches 2 g / L, at which point deep desilication is performed. The deep desilication solution is then carbonated to extract aluminum. Ammonium salts are added to the resulting solution to further extract vanadium. The final solution is crystallized and used as a calcination aid. The water leaching residue from the water leaching treatment is acid-leached, aged, and hydrolyzed to polymerize, yielding calcium sulfate, silica gel, and a water purification agent, respectively. This invention effectively utilizes both major and rare elements, solving the problems of red mud accumulation and the ineffective utilization of low-grade bauxite.

The application relates to the harmless treatment technology field of solid waste, in particular to a drying method of Bayer process red mud. The drying method comprises the following steps: mixing and stirring Bayer process red mud filter cake and a compounded additive to obtain mixed red mud material; wherein the compounded additive comprises an anti-agglomeration additive and an anti-bonding additive; and drying the mixed red mud material in a rotary kiln to obtain red mud products. The drying method is cooperated with the accurate control of the process parameters of the rotary kiln (external regulation guarantee) through the physical property regulation (internal regulation core) of the compounded additive, cuts into the interaction between the red mud material particles in the Bayer process red mud filter cake, the material fluidity, the environment and the mechanical action in the drying process from multiple dimensions, realizes the synchronous reduction of the viscosity and the agglomeration rate of the red mud products, and finally the red mud products with the water content of less than 9.0% and the average particle size of the agglomerated blocks of less than or equal to 4 mm can be obtained.

The invention discloses emulsion with a stable thickening agent and application of the emulsion to production of aluminum oxide through the Bayer process, and relates to the technical field of emulsion, the emulsion comprises an oily chemical, the thickening agent, water and an emulsifying agent, the oily chemical is a crystal growth auxiliary CGM used in production of aluminum oxide through the Bayer process, the thickening agent is a substance capable of increasing the viscosity of a water phase, and the emulsifying agent is an emulsifier capable of increasing the viscosity of the water phase. The emulsifier is a surfactant. According to the stable emulsion of the thickening agent and the application of the stable emulsion in production of aluminum oxide by a Bayer process, the thickening agent can realize uniform dispersion of oily CGM without a large amount of emulsifier by increasing the aqueous phase viscosity stable emulsion, the interference of the traditional emulsifier on the coarsening performance of the CGM is avoided, and the application effect of the stable emulsion is superior to that of the traditional emulsion and even exceeds that of the oily CGM; and the proportion of particles larger than 45 microns in the alumina trihydrate particles can be effectively increased.

The present invention discloses a method for joint production of alumina and iron smelting by the Bayer process. Firstly, the raw materials and auxiliary materials are mixed with bauxite containing a high content of iron oxide. Then high-temperature digestion is conducted on the mixed materials. Through this digestion process, a mixed slurry of red mud and sodium aluminate solution is obtained. Subsequently, this mixed slurry is subjected to sedimentation and separation, yielding red mud and sodium aluminate solution respectively. This red mud-based iron concentrate is proportionally mixed with the pre-set iron concentrate and calcium compounds, and then undergoes high-temperature treatment to produce a mixed sinter for use in an iron-smelting blast furnace. When the mixed sinter is fed into the iron-smelting blast furnace, pure iron products are obtained. Finally, the sodium aluminate solution is subjected to seed precipitation and calcination treatment, resulting in the production of alumina.

The invention discloses a method for producing aluminum oxide by using carbide slag instead of lime, which comprises the following steps: in the process of dissolving out bauxite by a Bayer process, adding carbide slag into circulating mother liquor, and carrying out dissolution treatment. According to the method for producing the aluminum oxide by using the carbide slag instead of the lime, the dissolution effect of the bauxite is equivalent to that of the traditional lime. The calcium-containing characteristic of the carbide slag is utilized, the effect of lime in the Bayer process dissolution process is ingeniously replaced, the effects of turning waste into wealth and recycling waste are achieved, and remarkable economic and social benefits are achieved.

This application provides a method for preparing high-whiteness aluminum hydroxide based on oxalate filter cake, belonging to the field of aluminum hydroxide preparation. The method includes: adding sodium oxalate circulating seed to the Bayer process seeding mother liquor to obtain an oxalate filter cake containing aluminum hydroxide; adding sodium carbonate to the oxalate filter cake to adjust the alkali ratio to 0.85–1.15, and adding lime to the oxalate filter cake to obtain a mixture; sintering the mixture to obtain sintered clinker; dissolving the sintered clinker to obtain a sodium aluminate solution; and seeding the sodium aluminate solution to obtain high-whiteness aluminum hydroxide. This application, through precise coupling of process parameters and a full-process design of the impurity control chain, simultaneously achieves deep removal of key impurities such as Fe and Si during the oxalate removal process, transforming the oxalate filter cake from waste into a high-quality raw material for high-whiteness aluminum hydroxide, thus combining the removal of organic matter from oxalate and the preparation of high-whiteness aluminum hydroxide in the Bayer process alumina production.

The invention discloses microwave activated red mud-biomass solid waste magnesium oxychloride aggregate and a circulation method, and belongs to the technical field of solid waste recycling and negative carbon building materials. The method comprises the following steps: mixing Bayer process red mud and biomass solid waste according to a mass ratio of 3: 1-1: 1, and carrying out microwave activation at 500-1200 DEG C for 10-60 minutes; carrying out magnetic separation on the activated material to obtain an iron ore concentrate-biomass charcoal composite material which can be used as a wave-absorbing material, so as to obtain low-alkali activated red mud residues; 10-50 parts of the residues, 15-40 parts of light calcined magnesia powder and 15-40 parts of a magnesium chloride solution are mixed, the molar ratio of magnesium oxide to magnesium chloride is 6-9, and solid waste aggregate is obtained after forming and curing; the waste aggregate is regenerated into active powder after being subjected to heat treatment at 400-800 DEG C for 0.5-2 hours, and new aggregate can be circularly prepared. According to the method, red mud dealkalization and iron recovery, high-value utilization of biomass and carbon sequestration and stability augmentation and closed-loop circulation of aggregate are synchronously realized.

The invention discloses a preparation method of a red mud oxygen carrier based on multistage gradient synergistic activation and application of the red mud oxygen carrier in chemical looping gasification. The preparation method of the red mud oxygen carrier comprises the following steps: by taking red mud produced by a Bayer process aluminum oxide process as a raw material, firstly carrying out layered gradient pretreatment on the red mud raw material, then carrying out multi-stage temperature control calcination activation, and finally carrying out functional modification, thereby obtaining the red mud oxygen carrier. The red mud oxygen carrier provided by the invention is used for removing nitrogen, sulfur and chlorine pollutants by chemical chain gasification of colored paint on the surface of the pop can, so that not only can efficient thermal removal of an aluminum-based waste material organic coating be realized, but also harmful gas generated in the gasification process is adsorbed and neutralized by using active components in the red mud; the technical problem of harmful gas emission in a traditional thermal paint removal process is solved from the source, and a green paint removal technical support is provided for high-value regeneration of aluminum-based waste materials.

The invention relates to the technical field of defoaming agents, and particularly discloses a durable aluminum oxide industrial defoaming agent and a preparation method thereof. Through synergistic cooperation of the gemini surface defoaming component, the AEO series surfactant, the composite alkali-resistant surfactant and other components, the defoaming agent provided by the invention can continuously and efficiently eliminate foam in alumina ore pulp, and overcomes the defect of poor foam elimination and inhibition performance of a traditional defoaming agent in a special alkaline environment of the alumina ore pulp; the adverse effect of the foam on the efficiency of producing the aluminum oxide by the Bayer process is effectively relieved.

The invention relates to the technical field of mineral recovery, in particular to a comprehensive recovery method for various valuable minerals in bauxite, which comprises the following steps: crushing and grinding the bauxite, and sequentially carrying out graded enrichment, surface modification activation and pre-desiliconization treatment to obtain activated ore pulp; mixing the activated ore pulp with a sodium hydroxide solution, carrying out high-temperature and high-pressure dissolution reaction, carrying out solid-liquid separation after the reaction to respectively obtain a sodium aluminate solution and activated red mud, and treating the sodium aluminate solution to obtain an aluminum oxide product; the method comprises the following steps: extracting and refining from Bayer process circulating mother liquor of a sodium aluminate solution through an adsorption method to obtain a metal gallium product; the activated red mud is subjected to deep reduction roasting, an obtained roasted product is subjected to ore grinding and then is subjected to magnetic separation, and an iron product is obtained; according to the method, various valuable minerals such as aluminum, gallium and iron can be synergistically recovered, and the extraction effect of gallium can be improved.

The invention relates to a method for preparing calcium aluminate by using alkaline residues, which comprises the following steps: adding an induced settling agent into alkaline residue slurry to promote the growth of calcium carbonate crystal grains in the alkaline residue slurry and further promote the settling of calcium carbonate, aluminum calcium carbonate and other products so as to facilitate subsequent better solid-liquid separation; carrying out dealkalization type liquid-solid separation treatment on the sedimentation liquid to obtain low-sodium modified alkaline residues and catalytic filtrate; reacting the catalytic filtrate with aluminum ash to obtain sodium aluminate, ammonia gas, methane and hydrogen; then carrying out solid-liquid separation to obtain modified aluminum ash with less leached fluorine and less volatile ammonia; and preheating and calcining the modified alkaline residues and the modified aluminum ash to obtain a target calcium aluminate product. The preparation method provides a thought for preparing high-quality calcium aluminate from the alkali residues discharged in the Bayer process aluminum oxide production process.

This invention belongs to the field of metallurgical solid waste resource utilization technology, specifically disclosing an iron-based additive, its preparation method, and its application. The preparation method includes: mixing red mud, sodium salt, and a reducing agent; subjecting the mixture to reduction roasting to obtain reduced clinker; grinding and separating the reduced clinker by magnetic separation to obtain iron concentrate, thus obtaining the iron-based additive. This invention uses red mud, sodium salt, and a reducing agent stored in alumina plants as raw materials. The sodium salt significantly lowers the reduction temperature of iron ore, and by controlling the temperature and the amount of reducing agent added, the hematite is partially or completely reduced. The resulting iron-based additive is returned to the Bayer process leaching, which can significantly improve the alumina leaching rate. Simultaneously, the titanium minerals in the obtained titanium-containing tailings exist in a specific phase or in the form of amorphous sodium titanate, exhibiting higher reactivity. This invention realizes the recycling and value-added utilization of solid wastes such as red mud, and has good application prospects.

The utility model provides a resource extraction system for returning aluminum ash to an aluminum smelting production process, and relates to the technical field of waste resource utilization. Comprising a wet byproduct carbon alkali storage tank, an aluminum electrolysis waste heat exchanger, a dry byproduct carbon alkali storage tank, an aluminum ash storage bin, a calcium additive storage bin, a mixing and stirring bin, a dry pelletizer, a rotary kiln, a dissolution device, a solid-liquid separator, a sodium aluminate storage tank and a tailing solid material storage bin. The system disclosed by the utility model can solve the problem that deep denitrification is difficult in the conventional aluminum ash wet process, and the removal rate of aluminum nitride is improved; the problem that wastewater generated in a current wet treatment process is difficult to treat is solved. The solid regenerated aluminum oxide raw material is directly prepared and returned to the aluminum oxide production process, the problem that the byproduct carbon alkali in the existing Bayer process production evaporation process cannot be economically utilized is solved, the byproduct carbon alkali serves as the raw material to be subjected to synergistic reaction with the aluminum ash, organic matter in the byproduct carbon alkali is eliminated, aluminum and sodium resources are efficiently extracted, and green cyclic utilization of the resources is achieved.

A method for reinforced recovery of iron minerals from high-iron red mud belongs to the technical field of industrial solid waste treatment, and comprises the following steps: conveying Bayer process high-iron red mud underflow ore pulp to a pretreatment tank, and adding recycled filter pressing water for dilution to obtain pretreated slurry; dissolving a surface conditioning agent and a flocculating agent in water to prepare a working solution; mechanically activating the magnetization enhancer to obtain the magnetization enhancer with uniform granularity; and adding a certain amount of a surface conditioning agent solution into the pretreated slurry, and carrying out dispersion treatment to obtain dispersed slurry and the like. According to the method, a surface conditioning agent is added into a red mud system, effective dissociation of iron minerals, aluminum and titanium minerals and gangue minerals such as silicon and calcium is achieved, a flocculating agent is introduced, target minerals form large-particle floccules, a magnetization enhancer is added, the magnetization enhancer is tightly combined with the iron mineral floccules, the selectivity and the enrichment efficiency of the subsequent magnetic separation process are improved, and the magnetic separation efficiency is improved. And efficient enrichment and separation of iron minerals in the red mud are achieved, and reduction and resource utilization of the red mud are promoted.

This invention provides a method for preparing alumina and removing chloride ions from kaolin and coal gangue, relating to the fields of inorganic chemical production and solid waste resource utilization. The method uses kaolin and coal gangue as raw materials, which are crushed and ground, calcined at high temperature, leached with hydrochloric acid, separated from aluminum and silicon, concentrated and crystallized with aluminum chloride, and calcined at low temperature to obtain acid-process alumina. Residual chloride ions are then removed through a precisely temperature-controlled water leaching dechlorination process, ultimately producing alumina superior to first-grade alumina via the Bayer process. The activity and dissolution rate of the acid-process alumina are ensured by controlling the calcination temperature of the aluminum chloride crystals at 730℃~780℃. A dechlorination process using 5~7 times the amount of water and constant temperature stirring at 95℃ for 45 minutes reduces the chloride ion content from 1%~2% to approximately 0.015%. This invention achieves full resource utilization of kaolin and coal gangue solid waste, efficient separation of aluminum and silicon components, and co-production of silica from the sludge. The process is simple, energy-efficient, and produces high-quality products, making it suitable for large-scale industrial production.

This invention refers to a technically and economically feasible process for recovery of metallic and non-metallic relevant contents from mining residues, particularly the bauxite residue, by using it in its whole. Such process route uses energy from microwaves, assisted leaching and logic sequencing of steps that allow a technically and economically feasible removal of components from the bauxite residue, particularly the residue from Bayer process. This invention still refers to a microwave reactor that is appropriate to perform the above-mentioned process, as well as to a method for heating a mining product.

The invention relates to a process for extracting iron from red mud through reduction and arc melting, which not only is beneficial to solving the environmental burden caused by solid waste residues, but also is beneficial to reducing carbon emission and promoting the development of a green metallurgical technology. The method is a solid waste residue formed by solid-liquid separation after aluminum oxide is dissolved out from bauxite through high-temperature high-pressure strong alkali in the process of producing aluminum oxide by adopting a Bayer process, and is characterized by comprising the following steps of: conveying red mud serving as a raw material into a rotary reducing atmosphere furnace; iron oxide in the red mud forms reduced iron in a furnace heating state and a reducing atmosphere, and the red mud containing the reduced iron is conveyed into an electric arc furnace for melting separation, so that the iron is extracted from the red mud.

The invention relates to a method for increasing the extraction of vanadium oxides from spent liquor produced by the Bayer process for the recovery of alumina from bauxite using water-soluble polymers.

The invention discloses a method for extracting vanadium oxide and a water purifying agent from vanadium-containing alkaline residues. According to the method, the vanadium oxide and the water purifying agent are extracted from the vanadium-containing alkaline residues generated in the impurity removal process in the Bayer process aluminum oxide production process through cooperation of HAc, the method has the advantages of being simple in process, short in process, low in safety and environmental protection risk, low in production cost, high in vanadium recovery rate and the like, and vanadium resource expansion and comprehensive utilization in the aluminum oxide production process are achieved.