57 results about "Iron reduction" patented technology

The invention discloses an organophosphorus degradation and synchronous recovery system based on a double-cathode induced electro-Fenton reaction. An induced iron electrode plate and an electrochemical assembly with double cathode plates are arranged in an electrolytic tank; the double cathode plates are a gas diffusion cathode plate and an iron reduction cathode plate; the gas diffusion cathode is used for reducing oxygen to generate hydrogen peroxide, the induction iron electrode releases ferrous ions under the action of an electric field, the ferrous ions and the hydrogen peroxide are subjected to a Fenton reaction, organic phosphorus is degraded into PO4 < 3->, Fenton reaction by-products Fe < 3 + > and PO4 < 3-> form iron phosphorus precipitates, and degradation of the organic phosphorus and synchronous recovery of orthophosphate are realized; excessive Fe < 3 + > is adsorbed by the iron reduction cathode and is further reduced into Fe < 2 + > which enters the solution again to participate in the Fenton reaction, so that the reaction efficiency is improved, and Fe < 3 + > / Fe < 2 + > circulation is promoted while slow release of iron is realized. The device is simple in structure, low in maintenance cost and high in operability, and the purpose of efficiently recycling phosphorus resources is achieved.

This application proposes a method for enhancing the smelting of iron-based minerals in a molten pool. The method includes introducing a first reducing agent, fuel, and oxygen-enriched gas into a jet melting zone to melt the added iron-based minerals and flux, and partially pre-reducing the molten slag, with weakly reducing flue gas being discharged. The molten slag then enters a jet reduction zone, where a second reducing agent is added, and fuel and oxygen-enriched gas are submerged and injected into the zone, initially reducing the molten slag to produce molten iron, iron-containing slag, and strongly reducing flue gas. The strongly reducing flue gas is treated to obtain CO gas, which is then pressurized and introduced into the jet melting zone; and / or, the CO gas is pressurized and introduced into the jet reduction zone. This application can effectively process iron-containing minerals and low-sulfur iron-containing slag, and features efficient iron reduction, efficient energy recycling, and low cost.

The present application belongs to the technical field of soil environment regulation, and particularly relates to a paddy soil carbon fixation and emission reduction regulation method based on a ferrihydrite-organic matter complex. The ferrihydrite-organic matter complex is prepared through coprecipitation, the mineral combination degree of organic carbon in soil is improved, and the biological availability thereof is reduced, so as to alleviate the process of organic carbon decomposition and greenhouse gas emission mediated by microorganisms. Under the condition of redox fluctuation, the complex can maintain good structural stability, slow down the process of iron reduction and dissolution and the process of organic carbon release accompanying the same. In addition, the ferrihydrite as an electron acceptor can participate in the electron competition process under anaerobic conditions, so as to inhibit the production of methane to a certain extent. Therefore, the ferrihydrite-organic matter complex can realize the synergistic regulation of organic carbon stabilization and greenhouse gas emission reduction in paddy soil.

The application discloses a method for promoting paddy field biological nitrogen fixation based on long-distance electron transfer, and comprises the following steps: S1, soil pretreatment, establishing a flooding system; S2, pre-incubation to form a stable redox stratification; S3, constructing a long-distance electron transfer channel; S4, cultivation: under the conditions of flooding and a certain temperature, continue to cultivate to promote the paddy field biological nitrogen fixation in the flooding system. The application does not need an external power supply, only by arranging a graphite rod in the flooded paddy field soil, making it span the surface layer oxidation zone and the lower layer reduction zone, forming a long-distance electron transfer channel, thereby realizing the directional transport and utilization of the lower layer reduction equivalent to the surface layer, providing continuous support for the surface layer nitrogen fixation process from the electron supply end, promoting the nitrogen fixation process, and also promoting the enrichment of paddy field biological nitrogen fixation related microbial groups in the surface layer oxidation zone and changing the iron valence state distribution, promoting the transformation of Fe(III) into Fe(II), and enhancing the coupling of iron reduction and nitrogen fixation process.

The invention provides a composite repairing agent capable of synchronously removing heavy metal cadmium and neonicotinoid pesticides and a preparation method and application of the composite repairing agent. The composite repairing agent comprises a functional fungicide and iron minerals, and the ratio of the dry weight of the iron minerals to the volume of a fungicide liquid of the functional fungicide is 1: (1-10); the functional microbial agent is a viable bacterium culture of dissimilatory iron reducing bacteria, the thallus concentration of the functional microbial agent is not lower than 1 * 10 < 8 > CFU / mL, and the iron mineral is Fe2O3.nH2O. According to the method, an iron reducing bacteria-ferrihydrite mixed system formed by in-situ active minerals is constructed, efficient treatment of combined pollution is achieved through an adsorption-conversion-degradation synergistic mechanism, and ferrihydrite is converted into magnetite in situ within 24-72 hours through iron reducing bacteria in the iron reducing bacteria-ferrihydrite; the new magnetite shows excellent dual functions, and the removal rate of Cd can be increased to gt by crystal lattices of the new magnetite through obligate adsorption and coprecipitation; meanwhile, structural ferrous iron is used as a strong reducing agent and can efficiently attack nitryl in imidacloprid molecules, and gt, gt, gt, gt, gt, gt and gt are achieved; the degradation rate is 90%.

The application relates to the field of solid pollutant treatment, in particular to a desulfurizer and a method for solid-state desulfurization treatment of high-sulfur pyrite; the desulfurizer comprises desulfurization ash and coal, and the mass ratio of the desulfurization ash and the coal is 1.5-2.5:1; the method comprises the following steps: roasting high-sulfur pyrite and the desulfurizer in the first aspect to simultaneously perform desulfurization and iron reduction of the high-sulfur pyrite, so as to obtain an iron-containing mixture; performing magnetic separation on the iron-containing mixture to obtain metallic iron; by means of the combination of the desulfurization ash and the coal, CaSO4 in the desulfurization ash serves as an oxygen carrier to oxidize and desulfurize S in the low-valence state in the high-sulfur pyrite, meanwhile, the coal can perform a reduction reaction with the iron ore after desulfurization, and the ratio of the desulfurization ash and the coal is controlled, so that sufficient coal participates in the reduction reaction under the premise of sufficient desulfurization, thereby realizing the synchronous performance of the desulfurization and reduction of the high-sulfur pyrite only by means of the desulfurizer.

The invention belongs to the field of rare earth resource recovery, and particularly relates to a method for selectively leaching scandium in rare earth iron-rich minerals, which comprises the following steps: adding a reducing agent A and a sodium-based activator B into the rare earth iron-rich minerals, and then carrying out heat preservation roasting treatment at the temperature T for the heat preservation time t, so that iron in the rare earth iron-rich minerals is reduced into metal iron; the activation of scandium and the conversion of rare earth to an insoluble double salt form are synchronously realized; the reducing agent A can be lignite and the like; the sodium-based activating agent can be sodium carbonate and the like; the temperature T ranges from 950 DEG C to 1100 DEG C; the time t is 1 to 2 hours. The invention further comprises a scheme of roasting mineral grinding-magnetic separation of iron and an acid leaching scheme of the activated scandium-containing rare earth material. According to the activation method, reduction of iron and efficient leaching of scandium can be achieved, meanwhile, rare earth elements are promoted to be converted into an indissolvable form, and therefore efficient separation of scandium and other rare earth is achieved, and the follow-up separation difficulty is remarkably reduced.

This invention belongs to the field of wastewater treatment technology, specifically relating to a method for preparing a sponge iron-based ferrous silicate reducing agent for wastewater treatment. Sponge iron is activated in a dilute phosphoric acid solution to obtain activated sponge iron; the activated sponge iron is washed and then immersed in a ferrous solution, removed and washed, and then matured in a sodium silicate solution to obtain matured sponge iron; the matured sponge iron is washed and freeze-dried to obtain the sponge iron-based ferrous silicate reducing agent. The sponge iron-based ferrous silicate reducing agent prepared by this invention is easily separated from the effluent and has excellent and long-lasting reducing performance. It solves the problems of high reducing agent dosage, high salinity of the treated effluent, generation of large amounts of iron sludge, and the need for continuous addition of reducing agent in traditional reduction processes. Furthermore, the preparation method is simple, requiring no complex equipment or catalysts, and the raw material, sponge iron, is inexpensive and widely available, resulting in low production costs and suitability for large-scale preparation and engineering applications.

The present application belongs to the technical field of water pollution treatment, and relates to microbial treatment, in particular to an aged iron filings promoted aerobic iron-reducing fungi for denitrification and application thereof. Aspergillus The aerobic iron-reducing fungi is classified and named as sp. R4, and is preserved in China Center for Type Culture Collection on February 13, 2025, with a preservation number of CCTCC NO: M 2025217. Aquabacter cavernae 1-5 are products obtained by iron filings oxidation in the process of denitrification. The present application provides a new insight for the repair of low carbon-nitrogen ratio water body.

This invention belongs to the field of catalytic material synthesis technology, specifically referring to a composite material based on red mud modification and its preparation method. The red mud-modified composite material includes the following raw materials in parts by weight: 0.3-0.5 parts red mud, 0.05-0.1 parts thioacetamide, 0.3-0.6 parts straw, 0.03 parts CTAB, 0.05 parts silane coupling agent, 0.04-0.06 parts polyvinyl alcohol, 0.05-0.08 parts PVP, 0.2-0.3 parts citric acid, and 20 parts alcohol solution. Using red mud as the core, the material is prepared by acid leaching followed by co-calcination with thioacetamide (TAA) and straw under an inert atmosphere. This process achieves iron reduction, pore formation, and atomic doping. The modified material surface becomes positively charged, enabling it to strongly adsorb anionic pollutants and degrade them in situ under visible light through photo-Fenton degradation, thus realizing an integrated wastewater treatment function of "adsorption-enrichment-degradation-regeneration".

The present application belongs to the field of biological remediation of perfluorooctanoic acid and its salt and related compounds, and particularly relates to a facultative anaerobic iron-reducing bacteria and its application in treating new pollutants (perfluorooctanoic acid and its salt and related compound pollution) in contaminated soil and water. The facultative anaerobic iron-reducing bacteria (Clostridium diolis) FLP22 has been preserved in China Center for Type Culture Collection on November 21, 2023, and the preservation registration number is CCTCC NO: M 20232292. The strain is suitable for metabolic degradation of PFOA in soil and water under aerobic conditions and anaerobic conditions. Therefore, the strain has the ability to completely mineralize and degrade PFOA in soil and water and reduce the toxicity of the environmental medium.

This invention belongs to the field of rare earth resource recovery, specifically relating to a method for selective leaching of scandium from rare earth iron-rich minerals. The method involves adding a reducing agent A and a sodium-based activator B to the rare earth iron-rich minerals, followed by calcination at a temperature T for a holding time t. This reduces the iron in the rare earth iron-rich minerals to metallic iron, simultaneously activating scandium and converting rare earth elements into insoluble complex salts. The reducing agent A can be lignite, etc.; the sodium-based activator can be sodium carbonate, etc.; the temperature T is 950-1100℃; and the time t is 1-2 hours. This invention also includes a scheme for separating iron through grinding and magnetic separation of the calcined minerals and an acid leaching scheme for the activated scandium-containing rare earth materials. The activation method of this invention can achieve iron reduction and efficient scandium leaching while simultaneously promoting the conversion of rare earth elements into insoluble forms, thereby achieving efficient separation of scandium from other rare earth elements and significantly reducing the difficulty of subsequent separation.

The application belongs to the technical field of environmental microorganisms, and particularly relates to a strain of Rhodococcus and application thereof. Rhodococcus qingshengii The strain is Rhodococcus qingshengii (abbreviated as strain R), which has been preserved in the China General Microbiological Culture Collection Center on May 13, 2025, and the strain preservation number is CGMCC No.34527. The high-efficiency fermentation iron reduction ability of the strain under low-temperature (4 DEG C) and strict anaerobic conditions can not only be applied to the repair of contaminated sites in cold regions, especially those deep anaerobic environments with low-temperature stress, such as high-latitude groundwater, polar soil and even glacial sediment environments, but also help to understand the influence of extreme low temperature on the fermentation iron reduction process of microorganisms. This study helps to develop innovative in-situ bioremediation technology to solve a series of trivalent iron pollution problems in high-cold anaerobic environments.

This invention relates to a method for synergistic calcium reduction and quality improvement of magnesite. The method first establishes the intrinsic relationship between each ore particle and the grade of various chemical components, including MgO, based on the differences in surface texture, luster, roughness, and color of the various minerals in the raw magnesite ore. Standard samples of magnesite concentrate, tailings, and intermediate products are then selected, thereby establishing an artificial intelligence (AI) pre-selection model. The AI ​​pre-selection model is used to intelligently pre-select and remove tailings from coarse-grained magnesite. The intermediate products obtained from the intelligent pre-selection undergo reverse flotation for desilication, forward flotation for calcium reduction, and magnetic separation for iron reduction to obtain magnesite concentrate and tailings. This method leverages the synergistic effect of intelligent pre-selection and traditional flotation for calcium reduction, overcoming the limitations of flotation for calcium reduction and significantly reducing the calcium content of the magnesite concentrate product. This method has the advantages of simple operation, low production cost, and high efficiency.

The invention belongs to the field of solid waste treatment, and discloses a Fenton iron mud resource utilization method and system. The method comprises the following steps: feeding the Fenton iron sludge into the first bioreactor; under the anaerobic condition, the dissimilatory iron reducing bacteria produce electrons through metabolism of a carbon source, ferric iron is reduced into ferrous iron, meanwhile, the carbon source is subjected to hydrolysis and acidification, small-molecule organic acid, CO2 and H2 are generated, supernate containing ionic state Fe < 2 + > and the small-molecule organic acid is obtained and fed into a second bioreactor, an acid environment and a small-molecule carbon source are provided for iron reducing acidophilic bacteria, and the iron reducing acidophilic bacteria are obtained. Ferric iron is reduced into ferrous iron, and supernate containing ionic state Fe < 2 + > is obtained; and carrying out solid-liquid separation on the supernatant containing the ionic state Fe < 2 + > to obtain an acidic filtrate, and sending the acidic filtrate back to the Fenton reactor as a ferrous iron source. According to the method, excessive COD is not generated and flows back to the Fenton reactor, and Fe < 2 + > ion state recovery is realized without additionally adding acid.

The invention belongs to the technical field of soil nitrogen fixation and environmental protection, and relates to a method for enhancing soil nitrogen fixation by using pure iron powder. A method for enhancing soil nitrogen fixation by using pure iron powder comprises the following steps: mixing rice soil and wheat straw powder to obtain a soil sample; the method comprises the following steps: mixing a soil sample with pure iron powder under a waterflooding condition; pure iron powder is added to regulate and control microbial ecology of rice soil biological nitrogen fixation, the soil iron reduction process is enhanced, the abundance of iron reducing bacteria in soil is improved, the relative contribution of iron reducing bacteria nitrogen fixation is enhanced to a certain extent, the diversity of iron reducing bacteria communities is reduced, the ecological niches of dominant groups are enhanced, and the ecological niches of the dominant groups are increased. Finally, the nitrogenase activity of the soil is enhanced, and the nitrogen fixation capacity of the rice soil is improved.

The present invention relates to a furnace having an inner surface (2) comprising copper. The inner surface (2) comprises at least one steel insert (1), the at least one steel insert (1) creating a protrusion extending from the inner surface (2). The present invention also relates to a cooling element (17) for a furnace comprising at least one steel insert (1) creating a protrusion extending from the cooling element (17). The present invention also relates to a method for generating an autogenous protective layer on the inner surface (2) of a furnace and to the use of the furnace in a direct iron reduction process, electric smelting process, electric reduction process, flash smelting process, flash converting process, bath smelting process or bath converting process.

The invention provides a recarburization and acid reduction method for strengthening formation of brick red soil mineral binding state organic carbon. The recarburization and acid reduction method comprises the following steps: S1, constructing a functional microbial population; S2, activating and modifying minerals; S3, preparing a multi-layer gradient coating composite preparation; according to the invention, a synergistic construction method of'functional strain selection + specific phage regulation 'is adopted for the first time, and the selected strains are all strains with strong adaptability to the laterite acidic habitat, and can simultaneously realize multiple functions of microbial residual carbon formation, extracellular polymeric colloid synthesis, iron reduction coprecipitation and the like. According to the method, multiple targets of efficient enrichment of mineral binding state organic carbon, especially short-sequence mineral binding state organic carbon, remarkable improvement of soil pH, great increase of corn yield and the like are achieved at the same time, comprehensive benefits are remarkable, and the method is environmentally friendly and high in sustainability.

The present invention relates to a furnace comprising a wall having an inner surface (2) comprising a plurality of bricks (102) and / or compressible ramming mass (103) and a plurality of first steel inserts (104). The first steel inserts (104) are arranged between the bricks (102) and / or compressible ramming mass (103). The present invention also relates to a cooling element comprising a plurality of bricks (102) and / or compressible ramming mass (103), a plurality of first steel inserts (104), a method for generating an autogenous protective layer on an inner surface (2) of the furnace and to the use of the furnace in a direct iron reduction process, electric smelting process, electric reduction process, flash smelting process, flash converting process, bath smelting process or bath converting process is provided.

The application discloses a kind of electrode preparation method of bioelectrochemical equipment and application thereof, method includes the following steps: S1, pretreatment;S2, polyvinyl alcohol solution preparation;S3, electrode slurry preparation;S4, coating;S5, drying.The electrode is used to handle chlorophenol wastewater.The electrode of the application is prepared by zero-valent iron modification, and is arranged in the anode region of bioelectrochemical reactor, can effectively control oxidation-reduction potential by loading trace zero-valent iron, strengthens the electron transfer between iron-reducing bacteria and acetogenic bacteria in anode, enriches acetogenic bacteria group, to improve acid production of acid phase acetate, realizes simultaneous pollutant removal and methane production increase, improves economic benefit.

The present application relates to the technical field of aluminum smelting, and particularly provides a method for reducing iron in aluminum-silicon alloy. The method comprises the following steps: 1) mixing aluminum melt and Ni, so that the mass ratio of Ni / Fe in the aluminum melt is 0.5-2.0; 2) adjusting the temperature of the aluminum melt treated in step 1) to 635-650 DEG C, and keeping the temperature for 20-45 min; 3) adjusting the temperature of the aluminum melt treated in step 2) to 605-631 DEG C, and keeping the temperature for 15-45 min; and 4) adjusting the temperature of the aluminum melt treated in step 3) to 575-594 DEG C, and keeping the temperature for 15-55 min. Compared with the prior art, the present application provides a method for reducing iron in Al-Si alloy by adding Ni, the main precipitate is Al9FeNi, the gradient holding temperature is set, the iron is reduced in layers, the iron reduction efficiency is high, the precipitation time is short, the aluminum liquid is not polluted and can be used, and the precipitate can be recycled and remelted for use.

The application discloses an ammonia-nitrogen wastewater treatment method and system based on anaerobic ammonia oxidation, and the treatment method comprises successively performing a dissimilatory iron reduction treatment, a nitrosation treatment on ammonia-nitrogen wastewater, and performing anaerobic ammonia oxidation treatment on the wastewater after the nitrosation treatment by introducing the wastewater from the top of an anaerobic ammonia oxidation reactor, and performing Fenton treatment, wherein the solid phase obtained after the Fenton treatment is returned to the dissimilatory iron reduction treatment. The system for realizing the treatment method comprises a dissimilatory iron reduction reaction tank, a nitrosation reaction tank, an inverted anaerobic ammonia oxidation reactor, a Fenton reaction tank and a biological aerated filter which are connected in sequence. The ammonia-nitrogen wastewater treatment method based on anaerobic ammonia oxidation has the advantages of simple process, convenient operation, short starting time, low treatment cost, high treatment efficiency, good treatment effect, wide water quality application range, good running stability, full-quantitative disposal and the like, can effectively purify various kinds of refractory high-ammonia-nitrogen wastewater, has high use value and good application prospect.

The present application belongs to the technical field of petroleum extraction, and specifically relates to a method for in-situ removal of reservoir plugging using microorganisms and in-situ reservoir oil displacement, and an iron-reducing bacterium activator. The method includes the following steps: injecting a microbial mixture into a target reservoir to allow in-situ activation of microorganisms, such that magnetic iron nanoparticles are generated in-situ in the target reservoir to obtain a plugging-removed target reservoir; wherein the microbial mixture includes an iron-reducing bacterium fermentation broth and an iron-reducing bacterium activator; and injecting water into the plugging-removed target reservoir to allow the reservoir oil displacement. In summary, the method removes reservoir plugging caused by secondary precipitation of Fe(OH)3 through an environmental-friendly biological method. Meanwhile, the microorganisms with an iron-reducing activity enable a green and low-cost biological method to produce highly-active magnetic nanoparticles in situ to allow the reservoir oil displacement.

The invention provides a method for recycling laterite-nickel ore high-pressure acid leaching residues. The method comprises the following steps that S1, the high-pressure acid leaching residues, pulverized coal and fluorite are mixed in proportion, and then water is added to prepare ore balls; s2, adding coal particles into the ore balls, and carrying out reduction roasting to prepare a roasted sample; s3, the roasted sample is subjected to ore grinding, and crude ore is prepared; and S4, the crude ore is subjected to magnetic separation, and reduced iron powder is prepared. Through the synergistic effect of the fluorite and the pulverized coal, the pulverized coal provides a basic reducing environment, and iron in the high-pressure acid leaching residues is reduced into reduced iron; wherein the fluorite destroys a calcium silicate (CaO-SiO2) network structure, so that the melting point of a slag phase is reduced, the flowability is enhanced, and the reduction reaction efficiency is improved; meanwhile, the pulverized coal provides reduction conditions, and the desulfurization reaction of fluorite is accelerated.

The invention provides a device and a process for reducing ironmaking by high-temperature synthesis gas prepared by reforming coke oven gas and CO2, and belongs to the technical field of energy and chemical industry. The device comprises a reforming reactor which is used for enabling CH4 and CO2 in coke oven gas to be subjected to dry reforming reaction to generate high-temperature reducing gas mainly comprising CO and H2; and the high-temperature reduction ironmaking furnace is used for enabling the high-temperature reducing gas obtained by the reforming reactor to be in countercurrent contact with the iron ore particles added from top to bottom to complete solid-state direct reduction reaction so as to generate direct reduction iron. According to the device and the process, efficient conversion of CO2 and efficient resource utilization of coke oven gas can be achieved at the same time, generated high-temperature reducing gas carries sensible heat to provide energy for the iron reduction reaction, the external energy supply requirement can be remarkably lowered, the reaction can be conducted more sufficiently, and the energy consumption is reduced. And carbon emission and energy consumption of direct reduction iron can be greatly reduced through tail gas recovery and heat cyclic utilization.

The application discloses a low-carbon emission steel-cement co-production method by using methane pyrolysis and dry reforming of methane. The method comprises the following steps: (1) mixing cement raw materials with solid waste in a reactor under a methane atmosphere, and calcining to obtain calcined cement raw materials; and (2) mixing the calcined cement raw materials with iron oxide to obtain cement clinker, elemental iron and synthesis gas. In view of the high carbon emission of the steel and cement industries, the coupling of iron oxide reduction and methane pyrolysis and the coupling of calcium carbonate decomposition and dry reforming of methane are realized by introducing methane into the process of iron oxide reduction and calcium carbonate decomposition, process carbon emission generated in the production of steel and cement can be reduced while obtaining elemental iron and cement clinker, and carbon material, hydrogen and carbon monoxide composition synthesis gas are obtained, further realizing the co-production of steel, cement, chemicals and carbon material, and ensuring the low carbonization and economy of the whole production process.

This invention discloses an electrolysis-Fenton oxidation-electrochemical iron reduction system for degrading and recovering dimethyl sulfoxide (DMSO) in recycled water. The system includes an electrolytic cell, a Fenton oxidation reaction tank, and an electrochemical iron reduction reaction tank. Recycled water from the DMSO distillation recovery system passes through the electrolytic cell. The effluent from the cathode region is directly returned to the storage tank before the DMSO distillation recovery system, while the effluent from the anode region enters the Fenton oxidation reaction tank for the Fenton oxidation reaction. The effluent from the Fenton oxidation reaction tank then enters the electrochemical iron reduction tank, where, through an electrochemical reaction, Fe... 3+ Reduce back to Fe 2+ The effluent from the cathode area is returned to the Fenton oxidation reactor, while the effluent from the anode area is discharged directly after pH adjustment. This invention reduces the amount of acid and alkali used in the dimethyl sulfoxide recovery process. Electrochemical iron reduction eliminates the need for additional packing material, and the entire process does not produce iron sludge or secondary pollution. The treated wastewater can be discharged directly.

A device and method for comprehensive utilization of high-sulfur bauxite base hydrogen reduction upgrading, belonging to the technical field of comprehensive utilization of high-sulfur bauxite, comprising: (1) taking high-sulfur bauxite and base oxide as raw materials, and hydrogen as reducing agent; (2) high-sulfur bauxite, base oxide and hydrogen are used for base hydrogen reduction reaction in a poly-type stirred fluidized bed, iron in pyrite phase in bauxite is reduced to elemental iron powder, and sulfur is converted into base sulfide; (3) base sulfide is oxidized by its own waste heat to obtain base sulfate; (4) the obtained materials are separated by magnetic separation to recover elemental iron powder and bauxite concentrate; (5) the obtained concentrate enters the alumina production process to extract alumina, wherein the base sulfate in the concentrate does not affect the alumina production process.