98 results about "Hematite" patented technology

The invention belongs to the field of biochar adsorbing materials, and relates to a method for preparing modified biochar with aquatic plant waste and hematite. The method includes the following steps: (1) naturally drying aquatic plants prior to crushing to obtain aquatic plant powder; (2) crushing the hematite to obtain hematite powder; (3) weighing the hematite powder prior to putting the hematite powder into deionized water, and performing ultrasonic treatment to obtain suspension; (4) weighing the aquatic plant powder, soaking the aquatic plant powder in the suspension, and stirring and drying to obtain fully mixed aquatic plant and hematite mixture; (5) weighing the fully mixed aquatic plant and hematite mixture, putting the mixture in a batch-type atmosphere furnace, and feeding nitrogen into the furnace; performing temperature programming to the target temperature, and maintaining final-temperature pyrolysis; after the pyrolysis process is finished, obtaining the target product, namely the modified biochar. The modified biochar has strong adsorbability in nitrate and phosphate, high in stability and reusable.

The invention relates to the technical field of mineralogy, in particular to a complex iron mineral distinguishing and quantifying method and an iron mineral content analysis method, which innovatively combines chemical dissolution, automatic mineralogy analysis and a micro-area magnetic verification technology to realize distinguishing and quantifying of complex iron minerals. According to the analysis method, a closed and mutual verification analysis system is formed, acid treatment of carbonate, automatic mineralogy analysis of residual minerals, micro-area magnetic verification correction of misjudgment of maghemite, element surface scanning verification of mineralogy total quantification accuracy and a final calculation result, and closed verification of the total iron content of chemical analysis are combined, and therefore the comprehensive performance of the magnetic separation system is improved. The reliability of a final result is ensured and standardized popularization and application are facilitated.

The invention discloses a high-aluminum limonite and specularite ore blending and sintering method which comprises the following steps: 1) preparing primary pre-blending powder: pre-blending high-aluminum limonite, specularite concentrate powder, iron oxide scale, limestone powder and anthracite powder to prepare the primary pre-blending powder with the water content of 6.5-7%; (2) preparing a uniformly mixed material: blending the primary pre-blended material powder obtained in the step (1) with high-silicon iron ore powder and hematite and limonite powder to prepare the uniformly mixed material; 3) sintering and burdening: burdening the uniformly mixed material obtained in the step 2) with limestone, dolomite powder, quicklime, solid fuel and return mine, and 4) controlling the components of the sintered ore as follows: 2.3-2.5% of Al2O3, 5.7-6.5% of SiO2, 8-8.5% of FeO and 1.85-2.5% of MgO. According to the invention, while 20-30% of the proportion of the discount ore silk road powder in the total uniformly mixed material is increased, the sintering cost is reduced by 20-42 yuan / ton, the drum strength of the sintered ore is greater than or equal to 78.5%, the return mine rate is less than or equal to 27%, and the RDI + 3.15 mm is greater than or equal to 63%.

The invention discloses a Mars soil simulant performance evaluation method based on spectrum-mechanics combined characterization, which comprises the following steps: acquiring surface soil chemical components and physical and mechanical reference data of a target Mars area, taking basalt, magnetite and hematite as raw materials, solving the optimal mass ratio by adopting an optimization algorithm, and preparing a sample. Then, systematic spectrum characterization is carried out on the sample, and components and spectrum characteristic data of the sample are obtained; and meanwhile, carrying out physical and mechanical property test on the sample to obtain mechanical property data. Further, spectrum and component data serve as independent variables, mechanical data serve as dependent variables, an associated data set is constructed, the influence weight is analyzed, and a component-structure-performance quantitative relation is established. And finally, based on all the data and the internal association thereof, calculating the comprehensive similarity between the simulant and the real Mars soil, and generating a comprehensive performance evaluation report. According to the method, multi-dimensional and standardized quantitative evaluation of chemical, mineral and mechanical properties of the Mars soil simulants is realized.

According to the iron ore alkali dissolution-electrolysis intelligent collaborative optimization system and the dynamic purification method provided by the invention, artificial intelligence and a metallurgical process are fused, and full-process dynamic regulation and control are realized. The system comprises: 1, an intelligent collaborative optimization module, which dynamically and collaboratively optimizes dissolution-electrolysis process parameters (NaOH concentration, liquid-solid ratio, Fe < 3 + > concentration and current density) based on reinforcement learning (DQN algorithm), predicts an impurity dissolution trend and adds a specific inhibitor in a gradient manner in combination with machine learning, and inhibits generation of Al2O3 / SiO2; the equipment health management module realizes corrosion / blockage two-factor accurate early warning (the accuracy is greater than or equal to 92%) through deep learning analysis of a corrosion image and a vibration spectrum, and is linked with a maintenance decision; the energy-resource coupling module integrates waste heat recovery (greater than or equal to 85%) and a multi-effect evaporation regeneration technology, so that the energy consumption per ton of iron is reduced to 2.9 GJ, and the alkali consumption is less than or equal to 0.95 kg; and 4, a self-adaptive process platform: dynamically updating the model based on a federated learning framework, and adapting to a complex ore source with Fe greater than or equal to 35% and Al2O3 less than or equal to 8%. The embodiment verifies that the system improves the hematite dissolution rate to 94%, reduces the non-planned shutdown of equipment by 40%, reduces the comprehensive cost by 14%, and is suitable for efficient and clean utilization of low-grade iron ores.

The invention relates to a silica ore dressing method which comprises the following steps: step 1, crushing raw ore of silica ore, step 2, grinding the crushed silica ore by adopting a ball mill, step 3, carrying out graded desliming treatment on the ground silica ore by using a hydrocyclone, step 4, carrying out weak magnetic separation on the deslimed silica ore, and step 5, carrying out magnetic separation on the deslimed silica ore. And 5, the non-magnetic material subjected to weak magnetic separation is subjected to strong magnetic separation, and silica concentrate is obtained. Before the ore is subjected to strong magnetic separation, strong magnetic minerals are removed through weak magnetic pre-separation, the strong magnetic separator is effectively prevented from being blocked, the operation stability and the production continuity of equipment are improved, various magnetic impurity minerals including intergrowth particles can be removed to the maximum extent through the whole technological process, and the production efficiency is improved. Such as hematite, limonite, biotite, ilmenite, pyrite and garnet.

The invention relates to the technical field of red mud recycling, in particular to a method for improving magnetic separation iron extraction efficiency by modifying red mud through industrial kiln tail gas CO2. The invention discloses a method for improving magnetic separation iron extraction efficiency by using industrial kiln tail gas CO2 modified red mud, which comprises the following steps: collecting tail gas discharged in the calcining process of an industrial kiln, and sequentially carrying out dust removal, desulfurization and compression to obtain compressed tail gas; the method comprises the following steps: mixing red mud with water, introducing compressed tail gas, and carrying out carbonization reaction at 60-80 DEG C to obtain carbonized modified red mud slurry; and the carbonized modified red mud slurry is placed in a high-gradient magnetic separator for magnetic separation, and refined iron powder is obtained. By means of the method, resource utilization of industrial kiln tail gas CO2 and efficient quality improvement of the red mud can be achieved, a dense alkali film wrapping hematite in the red mud is stripped, the hematite crystal structure is optimized, and meanwhile the iron extraction cost of the red mud and carbon emission of an industrial kiln are reduced.

[Problem] To provide a method for producing cementite, capable of suppressing carbon precipitation and stably producing cementite over a long period of time. [Solution] Hematite (Fe2O3) is put into a reactor as an iron oxide serving as an iron source, and a carbonized gas formed from a mixed gas of carbon monoxide and carbon dioxide is supplied to the reactor. Cementite (Fe3C) can be efficiently produced for a long period of time without precipitating carbon by adjusting the carbon activity so that ac = 1 to 10 and subjecting the carbonized gas and hematite to a reduction reaction.

The invention discloses a method for preparing fluxed oxidized pellets based on hematite, and aims to solve the technical bottlenecks that high-proportion hematite pellets are difficult to grind and settle, high in roasting energy consumption and low in strength. The method comprises the following three core processes: S1, raw material pretreatment: performing wet ball milling, polyacrylamide-assisted sedimentation and ceramic vacuum filtration on coarse-grain hematite powder of which the particle size is less than 10mm, uniformly mixing with magnetite concentrate, and performing high-pressure roller milling treatment; s2, green pellets are prepared, specifically, the iron ore mixture is evenly mixed with bentonite, a calcium ferrite additive and a limestone flux, and qualified green pellets are prepared through a disc pelletizer; and S3, pellet roasting is conducted, specifically, green pellets are subjected to segmented drying, preheating and roasting in a chain grate-rotary kiln, and a finished product is obtained. According to the invention, the hematite with abundant reserves is used as a main raw material, and the compressive strength of the prepared oxidized pellets is more than 2500N / piece, the drum strength is more than 93%, the wear resistance index is less than 5%, and the prepared oxidized pellets have the cost advantage and the environmental protection benefit, and meet the high-efficiency smelting requirement of a blast furnace.

The present application relates to the technical field of mineral processing, and particularly relates to a modified dodecylamine collector, a preparation method and application thereof.The preparation method of the modified dodecylamine collector provided by the present application comprises the following steps: carrying out glow discharge air plasma treatment on dodecylamine by taking air as a working gas.The present application introduces oxygen-containing and / or nitrogen-containing active groups on the surface of dodecylamine molecules by means of glow discharge air plasma modification of dodecylamine, and the dodecylamine is used for flotation separation of quartz and hematite, so that the adsorption capacity and selectivity of the dodecylamine to quartz, especially fine quartz, are enhanced, and efficient separation of quartz and hematite can be realized at a lower dosage; and the raw material of the preparation method is green and environmentally friendly, the modification process is low-temperature, safe and controllable, no by-product is generated, and the energy consumption is low.

The invention relates to a magnetic material comprising at least iron, in metal form and / or in oxide form, and at least one clay matrix, the iron content being between 15% and 70% by weight of iron element relative to the total weight of said material, characterized in that said material has a specific surface area greater than 1 m² / g and less than 50 m² / g, and said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

The invention relates to the technical field of metallurgical solid waste resource utilization, in particular to a method for enriching iron in vanadium extraction tailings and spiral separation equipment, and the method comprises the following steps: pretreatment, crushing and screening: feeding the vanadium extraction tailings into a jaw crusher for coarse crushing until the particle size is less than or equal to 50mm; the particle size of a crushed product is controlled to be smaller than or equal to 10 mm, the fine crushed product is screened through a linear vibrating screen, the size of a screen hole is 2 mm, oversize products return to the impact crusher to be crushed again, undersize products enter the next step, large gangue and impurities in the tailings can be removed in the step, and energy consumption is reduced for follow-up ore grinding operation. The combined technological process of pretreatment, magnetic separation roughing, spiral gravity separation and magnetic separation concentration is adopted, strong magnetic minerals are rapidly recovered through magnetic separation, then spiral gravity separation is adopted for weak magnetic and intergrowth minerals, the advantages of different separation technologies are fully played, and the problem that the recovery rate of the weak magnetic minerals such as hematite is low through a single magnetic separation method is solved.

The invention relates to a magnetic material comprising at least iron, in metallic form and / or in oxide form, and at least an alumina oxide matrix, the iron content being between 15% and 70% by weight as element iron relative to the total weight of said material, characterized in that said material has a specific surface area greater than 50 m² / g and less than 300 m² / g, said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

A spur gear (1) as a mechanical component is made of steel containing 0.12 mass % or more and 0.28 mass % or less of carbon, 0.15 mass % or more and 0.70 mass % or less of silicon, 0.20 mass % or more and 0.95 mass % or less of manganese, 0.85 mass % or more and 1.90 mass % or less of chromium, with the remainder being iron and unavoidable impurities, and has a martensitic structure and includes a carburized layer (31) arranged to form at least a part of a surface and having a higher carbon concentration than the other part. The carburized layer (31) includes a composite oxide film (40) arranged to form the surface and having a thickness of 1 µm or more and 25 µm or less and containing magnetite and hematite.

The disclosed ore-dressing plant process arrangement includes multiple process platforms and multiple material conveying channels. The multiple process platforms are sequentially arranged from top to bottom along the terrain. The multiple process platforms include at least a first process platform, a second process platform, a third process platform, and a fourth process platform. The first process platform is provided with a magnetite grinding and separation unit. The second process platform is provided with a hematite grinding and separation unit. The third process platform is provided with a hematite gravity separation unit. The fourth process platform is provided with a hematite flotation unit. The multiple material conveying channels are used to connect the multiple process platforms. The elevations of the multiple process platforms sequentially decrease along the material flow direction, so that the materials between the process platforms can be self-flow conveyed. The disclosed ore-dressing plant process arrangement sequentially arranges multiple process platforms from top to bottom according to the terrain, and uses the terrain difference for stepwise arrangement, to realize self-flow conveying of the ore slurry, reduce the energy consumption of the ore slurry conveying, and reduce the cost.

The invention relates to a magnetic material comprising at least iron, in metal form and / or in oxide form, and at least one alumina oxide matrix, the iron content being between 15% and 70% by weight of iron element relative to the total weight of said material, characterized in that said material has a specific surface area greater than 50 m² / g and less than 300 m² / g, and said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

The utility model discloses a winnowing separator for ore processing, which relates to the technical field of ore processing and comprises a case, and a feeding hopper for feeding ore is arranged at the top of the case; the screen surface is arranged in the machine box and used for screening and separating ores, the screen surface is obliquely arranged in the machine box, light materials are discharged from the low end of the screen surface, and heavy materials are discharged from the high end of the screen surface; the reciprocating driving mechanism is arranged in the case and is used for enabling the screen surface to move back and forth in the case to throw ores; the wind power mechanism is arranged in the machine box, located below the screen face and used for blowing the thrown ore, and therefore the ore materials (hematite, limonite, coal mine and the like) can be rapidly subjected to isovolumetric screening.

The invention relates to a beneficiation method for improving the metal recovery rate of lean magnetic and hematite, which comprises two sections of closed-loop continuous ore grinding operation, one section of weak magnetic operation, two sections of strong magnetic operation, three-time grading closed-loop ore grinding operation and flotation operation, and is characterized in that the reverse flotation operation is closed-loop reverse flotation operation consisting of one section of roughing, one section of concentration and three sections of scavenging; and combined sorting is carried out on a suspended vibration conical surface concentrator. The method has the advantages that the flotation tailings are subjected to fine separation through the suspended vibration conical surface concentrator, the iron ore concentrate recovery rate can be increased by 1-5%, the grade of the flotation tailings is reduced by 1.5% or above, and efficient recovery of poor magnetic and hematite metal is achieved.

This invention discloses a method for producing hematite concentrate from rich limonite powder. The rich limonite raw material has a moisture content of 9% or less. The raw material enters a dry grinding mill through a vibrating feeder at a controlled flow rate. The mineral particles produced by grinding are heated and sorted using circulating high-temperature flue gas and then captured by a gravity dust collector and dust collector to produce the hematite concentrate. This method reduces the production costs of sintered ore and pelletized ore, improves productivity, and reduces overall energy consumption.

This invention discloses a method for the comprehensive utilization of high-silicon hematite reverse flotation tailings. Hematite reverse flotation tailings with a TFe grade between 11.0% and 15.0%, SiO2 content >78.0%, and hematite comprising more than 95% of the total iron minerals are processed through a first-stage high-intensity magnetic separation, a first-stage grinding-second-stage high-intensity magnetic separation, and a cationic reverse flotation. The resulting products are: a first-stage high-intensity magnetic scavenging concentrate with a TFe grade >25.0%, suitable for use as an iron correcting agent in cement production; a first-stage high-intensity magnetic scavenging tailings with a SiO2 purity >96.0%, suitable for use as raw material for high-purity quartz sand production; and grinding tailings suitable for use as iron and silicon correcting agents in cement production. This method achieves comprehensive utilization of high-silicon hematite reverse flotation tailings. The method has advantages such as a short process flow, low energy consumption, and high resource utilization rate, and is particularly suitable for the efficient treatment and comprehensive utilization of high-silicon hematite reverse flotation tailings.

The invention discloses an iron oxide ore combined collecting agent and application thereof, and belongs to the technical field of mineral flotation. According to the combined collecting agent, a multi-element mixed coordination field is constructed through dihydroxamic acid and oximido, a stable composite adsorption layer is formed, and meanwhile, a dense hydrophobic layer is constructed on the surface of a mineral through the hydrophobic synergistic effect of a flexible aliphatic chain and a rigid benzene ring. The application of the combined collecting agent in iron oxide ore flotation comprises the steps that after iron oxide ore is smashed and subjected to size mixing, the combined collecting agent and a foaming agent are added, an oxidizing agent can also be added, and concentrate is obtained after air inflation flotation. The combined collecting agent can achieve efficient flotation of ilmenite, hematite and siderite under the mild condition, and has the advantages of being good in selectivity, high in recovery rate, small in dosage and environmentally friendly.

The invention relates to a method for preparing magnetic artificial rutile from acid-soluble titanium slag, which comprises the following steps: heating and converting the acid-soluble titanium slag, hematite, a reducing agent and B2O3 into liquid molten slag, blowing air into the molten slag at a heat preservation temperature after heat preservation is finished for oxidation, cooling after oxidation, embedding fine ilmenite crystal grains into rutile crystals in the cooling process, and forming the magnetic artificial rutile by using the ilmenite crystal grains. The rutile indirectly has magnetism, and finally the modified slag containing the magnetic artificial rutile is obtained; performing magnetic separation to obtain artificial rutile concentrate and tailings; and pickling to obtain the high-grade artificial rutile. The modified slag containing the magnetic artificial rutile is prepared through additive adding and high-temperature oxidation, then the magnetic artificial rutile is separated from gangue by means of magnetic separation, the artificial rutile concentrate is obtained, the process is economical and environmentally friendly, the hydrochloric acid consumption and the waste liquid output in the follow-up pickling process are remarkably reduced, and the production cost is reduced. And the TiO2 content of the product artificial rutile is greatly improved, and high value-added utilization of the acid-soluble titanium slag is realized.

The invention relates to an Anshan type magnetite-hematite mixed iron ore diversion separation method which comprises the following steps: feeding raw ore into a first-section closed circuit grinding system and a second-section closed circuit grinding system, performing overflow feeding of a second-section cyclone into first-section barrel type low-intensity magnetic separation operation to obtain first-section low-intensity magnetic concentrate and tailings, performing second-section electromagnetic concentration operation on the first-section low-intensity magnetic concentrate to obtain first-section low-intensity magnetic concentrate and tailings, and performing second-section electromagnetic concentration operation on the first-section low-intensity magnetic concentrate; the first-section weak magnetic tailings and the second-section electromagnetic concentration tailings are combined and fed into high-intensity magnetic separation operation to obtain high-intensity magnetic concentrates and tailings, the high-intensity magnetic concentrates are fed into reverse flotation operation to obtain reverse flotation concentrates and tailings, and the reverse flotation concentrates and the electromagnetic concentration concentrates are combined to serve as final qualified iron concentrates. The strong magnetic tailings and the reverse flotation tailings are combined and discharged as final tailings. According to the method, easy-to-separate strong magnetic magnetite is recovered through a single low-intensity magnetic separation process, weak magnetic hematite is recovered in combination with a strong magnetic-reverse flotation process, and reselection operation is not needed, so that the separation process is simplified, the separation efficiency is improved, and the production cost is reduced.

The present application relates to the technical field of mineralogy, and particularly provides a complex iron mineral distinguishing and quantifying method and an iron mineral content analysis method, which combines chemical dissolution, automatic mineralogy analysis and micro-area magnetic verification technology for the first time to realize the distinguishing and quantifying of complex iron minerals. The analysis method constitutes a closed and mutually checked analysis system, which combines acid treatment of carbonates, automatic mineralogy analysis of residual minerals, micro-area magnetic verification to correct the misjudgment of magnetic hematite, element surface scanning to check the accuracy of overall mineralogy quantification, and final calculation results, and checks the total iron content of chemical analysis to ensure the reliability of the final results and facilitate the standardized popularization and application.

The present application relates to the technical field of goethite, and provides a goethite, a preparation method and application, the preparation method comprises the following steps: S1, coarse crushing of limonite, sieving, to obtain a coarse crushing sample; S2, fine crushing and grading sieving, to obtain a plurality of batches of fine sieving samples; S3, heating and heat preservation of the fine sieving samples; S4, magnetic separation of the fine sieving samples, and weakly magnetic hematite and strongly magnetic substances are extracted together; S5, repeating steps S3 and S4 until the content of the remaining magnetic substances is within a set threshold; S6, cooling the fine sieving samples to below the Neel temperature of goethite, and then performing magnetic separation again to separate goethite. The present application has the advantages of large processing capacity, high processing efficiency, continuous production, and significantly reduced difficulty in obtaining goethite. In addition, compared with the traditional hydrothermal synthesis method, the present application removes the use of chemical products, effectively reducing the environmental problems in the production process of goethite.

According to the pressure leaching iron removal process based on hematite seed crystal optimization and the seed crystal preparation method, the crystallinity and the purity of hematite are remarkably improved by regulating and controlling the temperature, the pressure, the pH and the liquid-solid ratio and combining internal source seed crystal acid pickling purification. The process has the iron removal rate of more than or equal to 95%, is high in nickel and copper recovery rate, and is suitable for an industrial hydrometallurgy system.

The invention relates to a magnetic material comprising at least iron, in metal form and / or in oxide form, at least one oxide matrix, the iron content being between 15% and 70% by weight of iron element relative to the total weight of said material, and at least silicon carbide in its alpha (α-SiC) crystallographic form, characterized in that said material comprises at most 25% by weight of hematite relative to the total weight of said material, said material being in the form of beads or extrudates.

The invention discloses a one-stage low-temperature two-stage high-temperature high-zinc high-iron solution oxygen pressure kettle medium-temperature iron precipitation separation method, which belongs to the technical field of lead-zinc smelting, and comprises the following steps: one-stage and two-stage oxygen pressure leaching, replacement copper precipitation, pre-neutralization, indium precipitation, mineralization iron precipitation and neutralization iron removal. According to the method, first-stage low-temperature countercurrent oxygen pressure leaching and second-stage high-temperature countercurrent oxygen pressure leaching are adopted, efficient leaching of various valuable metals such as zinc, copper and indium is achieved, valuable elements such as silver, lead and elemental sulfur are enriched in the second-stage oxygen pressure leaching residues, the sulfur content and the lead-silver enrichment ratio in the second-stage oxygen pressure leaching residues are increased, and the yield is increased. And the second-stage oxygen pressure leaching residues are conveyed to sulfur flotation to produce qualified sulfur concentrate and sulfur tailings rich in lead and silver, the sulfur concentrate is conveyed to a sulfur melting system to produce sulfur, and the sulfur tailings are conveyed to a lead system to be subjected to pyrogenic treatment. According to the method, the copper slag, the pre-neutralization slag and the indium precipitation slag can be respectively produced; hematite is produced after indium precipitation liquid is treated, zinc and iron are efficiently separated, and the slag amount is reduced; and treating the mineralized iron-precipitated solution to generate a neutralized iron-removed solution, and purifying and electrodepositing the neutralized iron-removed solution to produce metal zinc.

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 present application relates to the technical field of iron ore dressing, in particular to a combined process of hydrogen-based mineral phase conversion-magnetic separation-reverse flotation for hematite. In the prior art, the process for dressing hematite has the problems of low concentrate grade, low iron recovery rate, and incomplete reduction of coarse-grained minerals and over-reduction of fine-grained minerals in the hydrogen-based mineral phase conversion technology. To solve the above problems, the present application fully separates hematite and diaspore after grinding and grading, and then converts the hematite Fe2O3.nH2O into Fe2O3 by hydrolysis and then into magnetite Fe3O4, and converts the diaspore Al2O3.nH2O into corundum Al2O3, and then combines the processes of magnetic separation and flotation to obtain high-purity iron concentrate, which reduces energy consumption and reagent use, improves the grade and recovery rate of iron concentrate, and realizes the double optimization of economy and environmental performance.