198 results about "Ferric iron compound" patented technology

The invention discloses a lithium manganese iron phosphate positive electrode material with a core-shell structure, which is prepared by the following steps: mixing a manganese source, an iron source, a phosphorus source, lithium carbonate and a carbon source, grinding and drying to prepare a pre-sintered material; then carrying out gas crushing on the pre-sintered material to obtain a pre-gas crushed material, and carrying out heat preservation at the temperature of 200-600 DEG C; putting the pre-gas crushed material subjected to heat preservation into an iron salt solution for quenching reaction to obtain iron compound coated lithium manganese iron phosphate; and finally, mixing the lithium iron manganese phosphate coated with the iron compound, a lithium source, a phosphorus source and a carbon source, grinding, drying, and carrying out secondary calcination to obtain the lithium iron manganese phosphate material with the core-shell structure. During preparation of the lithium manganese iron phosphate positive electrode material, a lithium manganese iron phosphate pre-sintered body and an iron salt solution are subjected to a quenching reaction to form an iron compound coated lithium manganese iron phosphate pre-sintered body, and then the iron compound coated lithium manganese iron phosphate pre-sintered body and other raw materials of lithium iron phosphate are subjected to a secondary calcination reaction to generate the composite positive electrode material with a core-shell structure. A coating structure is formed, the reaction between manganese and electrolyte is reduced, the dissolution of manganese is inhibited, the Gingtaler effect of manganese is relieved, and the stability of the material is improved; and the material has the advantages of high energy density, high power density, excellent cycle performance and strong core-shell interface bonding force.

The invention discloses a recycling method of a positive plate of a waste lithium ion battery, and relates to the technical field of resource recycling of the waste lithium ion battery. The method comprises the following steps: (1) pretreatment of the waste lithium ion battery: discharging, disassembling and crushing the waste lithium ion battery to obtain positive plate scraps; (2) catalytic leaching of the positive plate chippings: preparing a leaching agent solution from acid, an iron-containing compound and a chlorine-containing compound, adding the positive plate chippings into the leaching agent solution for reaction, and filtering to obtain a leaching solution; (3) iron and aluminum in the leachate are separated, specifically, an alkali solution is added to increase the pH of the leachate to precipitate iron and aluminum, and precipitates containing iron and aluminum and a valuable metal solution are obtained through filtering separation; and (4) recovery of the catalyst: putting the iron-aluminum precipitate into an alkali solution, dissolving an aluminum element, and filtering to obtain an iron precipitate. The process flow is simple, no extra reducing agent needs to be added, and recovery of all metal elements in the positive plate is achieved.

The invention discloses a device and a method for regenerating a powdery iron oxyhydroxide desulfurizer and purifying sulfur, and the device and the method are characterized in that invalid iron oxyhydroxide is completely reduced into a ferrous oxide and ferrous sulfide after sulfide is added, the reaction of an iron compound is enhanced through ultrasound and stirring, and the separation of the iron compound and the sulfur is promoted. Further fully aerating to fully oxidize the ferrous iron to generate new iron oxyhydroxide; at the moment, the iron oxyhydroxide is in a completely dispersed state, the single particle size is not higher than 1 micron, and small flocs with the particle size of 0-5 microns are formed in laminar water; the surface of the sulfur has hydrophobicity, and the sulfur is gathered to generate hydrophobic self-flocculation, so that large flocs with the particle size of 30-300 microns are formed in the laminar water; the mixture is flushed by water flows with different flow speeds, the iron oxyhydroxide with small particle size is flushed out at a certain flow speed, and the sulfur with large particle size is suspended in the grading pipe, so that the regeneration of the iron oxyhydroxide desulfurizer and the purification of the sulfur are realized.

The invention relates to a self-supporting electrode and a preparation method and application thereof, and belongs to the technical field of new energy and alkaline electro-catalytic water decomposition. A preparation method of a self-supporting electrode comprises the following steps: taking a nickel net, foamed nickel or a stainless steel net as a substrate, taking deionized water containing a ferric iron compound and phosphate as an etching solution, soaking the substrate in the etching solution at room temperature, taking out the substrate, and drying at room temperature to obtain a surface-modified self-supporting electrode; according to the method, PO4 < 3-> is introduced while the Fe / M self-supporting electrode is synthesized through a one-step etching method, so that the free energy of * OH and * O intermediates is adjusted, the valence state is adjusted, and the oxygen evolution reaction rate is increased; meanwhile, PO4 < 3-> and Fe sites act, so that the Fe coordination sites are stabilized, and precipitation of iron is prevented; the self-supporting electrode prepared by using a room-temperature one-step chemical etching method not only has good water electrolysis oxygen evolution reaction activity, stability and repeatability, but also is simple and rapid in preparation process and low in cost, and large-scale industrial production can be realized.

The invention provides a method for improving the infrared reflection performance of a gold coating, which comprises the following steps: dispersing an iron compound solution into an organic gold coating, and uniformly stirring to obtain an iron-doped organic gold coating; a quartz substrate is coated with the iron-doped organic gold coating, and an iron-doped gold coating is obtained through drying and annealing processes. Iron is doped in the organic gold coating, and the infrared reflection performance of the gold coating is effectively enhanced by utilizing charge transfer and transition of Fe < 3 + > and the influence of the electron structure of Fe < 3 + > on the band gap characteristic of crystals and the size structure of crystal grains. The method is simple in preparation and low in cost, and the iron-doped gold coating prepared through the method is excellent in weather resistance, corrosion resistance and infrared reflection performance and has wide application prospects.

The present invention relates to the technical field of lithium-ion batteries. Disclosed are a lithium manganese iron phosphate positive electrode material and a preparation method therefor. The preparation method comprises: uniformly mixing raw materials with a solvent to obtain a primary mixture, wherein the raw materials include a phosphorus-containing compound, a manganese-containing compound, an iron-containing compound, a lithium-containing compound, and a carbon-containing compound; performing primary pretreatment and primary sintering on the primary mixture to obtain a primary sintered material; uniformly mixing the primary sintered material, an additive, and a solvent to obtain a secondary mixture, wherein the additive contains the element phosphorus; performing secondary pretreatment and secondary sintering on the secondary mixture to obtain a secondary sintered material, wherein the secondary sintering enables the phosphorus in the additive to be distributed on the surface of particles of the secondary sintered material to form a phosphorus-rich shell layer; and performing post-treatment on the secondary sintered material to obtain the lithium manganese iron phosphate positive electrode material. The present invention can reduce the powder resistivity of the positive electrode material, so that the attenuation rate of a voltage platform in the cycling process is slowed down, and the cycle life of the lithium manganese iron phosphate positive electrode material is prolonged.

The invention relates to the technical field of nano medicine, in particular to iron gambogic acid adriamycin nano particles, a preparation method and application. Gambogic acid, doxorubicin hydrochloride and an iron-containing compound are matched, carbonyl oxygen and hydroxyl in the gambogic acid and Fe < 3 + > form coordinate bonds, carbonyl and amino in the doxorubicin hydrochloride and a conjugated system in a benzene ring are combined with Fe < 3 + > through covalent bonds and pi-pi accumulation, a core-shell structure is formed, and the iron gambogic acid doxorubicin nano-particles are obtained. The particle size of the iron gambogic acid adriamycin nano-particles ranges from 2 nm to 10 nm. The iron gambogic acid adriamycin nano-particles have excellent multi-enzyme activity, autophagy amplification is effectively achieved, traditional chemotherapy drug resistance caused by autophagy is overcome, and the glioma chemotherapy effect is improved.

The invention provides a Fe-Fe3C-coated rGO carbon nanoelectrode material as well as a preparation method and application thereof, and belongs to the technical field of electrode materials. Aiming at the problem that an existing electrode material is difficult to be used as a CDI electrode material for removing heavy metals, the CDI electrode material is prepared by utilizing the characteristic that multivalent metal iron ions can be subjected to cross-linking reaction with a sodium alginate solution, and the preparation method comprises the following steps: obtaining a graphene oxide dispersion liquid; under a water bath condition, adding sodium alginate into the graphene oxide dispersion liquid, dropwise adding the obtained gel liquid into a ferric salt solution, stirring, and freeze-drying to obtain aerogel microspheres; and carrying out high-temperature carbonization on the aerogel microspheres to obtain the Fe-Fe3C-coated rGO carbon nanomaterial. When the material is used as a CDI electrode material, aggregation of an iron compound on the surface of graphene can be effectively reduced, the specific capacitance, the conductivity and the cycling stability of the electrode material are improved, and a good Cr (VI) removal effect is achieved.

The invention belongs to the technical field of lactic acid production, and discloses a method for preparing lactic acid by electrocatalytic cathode and anode coupling, which comprises the following steps: assembling an anode catalyst as an anode, a cathode catalyst as a cathode and an electrolyte into an electrolytic tank; 1, 2-propylene glycol is added into the anolyte and the catholyte respectively; under the application of a certain voltage, 1, 2-propylene glycol is oxidized into lactic acid at the anode end; oxygen is continuously introduced into the catholyte, meanwhile, a ferrous compound is additionally added into the catholyte for catalysis to form hydroxyl free radicals, and electro-conversion of 1, 2-propylene glycol and oxygen is achieved through an electro-Fenton reaction to prepare lactic acid. Compared with single-side anodic oxidation, the method has the advantages that the energy utilization rate is increased, and a new thought and method are provided for green and efficient preparation of lactic acid at normal temperature, normal pressure and high current density.

The invention discloses an electrolyte containing a redox medium as well as preparation and application of the electrolyte. The positive electrode electrolyte and the negative electrode electrolyte comprise tetravalent or trivalent vanadium ions, mixed acid, an iron ion additive and water, the iron ion additive is composed of iron phthalocyanine and a second iron-containing compound, and the second iron-containing compound comprises at least one of ferric acetylacetonate, heme iron and iron trifluoromethanesulfonate. The preparation method comprises the following steps: activating vanadium pentoxide in mixed acid, adding water to obtain a mixed solution, and adding a reducing agent into the mixed solution to react to obtain an initial mother solution; adding an iron ion additive into the initial mother solution, and uniformly mixing to obtain a positive electrode electrolyte; and electrolyzing the initial mother liquor to obtain electrolyte containing trivalent vanadium ions, adding an iron ion additive into the electrolyte, and uniformly mixing to obtain the negative electrode electrolyte. The charge-discharge polarization is reduced by using a small amount of iron ion additive containing iron phthalocyanine; the capacity fading caused by pentavalent vanadium precipitation is released; and the energy efficiency and the cycling stability of the battery are improved.

The invention discloses a composite material containing porous carbon and sodium ferric sulfate as well as a preparation method and application of the composite material, the composite material comprises the porous carbon and the sodium ferric sulfate, the porous carbon is used as a carrier, and the sodium ferric sulfate is distributed on the outer surface and in pores of the porous carbon. The preparation method of the composite material comprises the following steps: firstly, uniformly mixing an iron-containing compound, a sodium-containing compound, a sulfate radical-containing compound and a solvent to obtain a first material flow; and uniformly mixing with porous carbon to obtain a second material flow, and further drying and roasting to obtain the composite material. According to the method disclosed by the invention, the composite electrode material with high rate performance can be obtained, and the composite material has relatively high energy density and power density when being applied to a sodium ion capacitor and a sodium ion battery.

To provide a heavy metal insolubilizing material for insolubilizing heavy metal contained in a heavy metal contaminant (for example, incineration ash, soil, and drainage water), which can exhibit an excellent insolubilization effect to a plurality of kinds of heave metal (for example, arsenic and hexavalent chromium), in a short time (for example, 2 to 3 hours).SOLUTION: A heavy metal insolubilizing material contains an iron compound composed of either or both of ferrous sulfate monohydrate and ferrous chloride tetrahydrate, and a magnesium compound composed of one or more selected from the group consisting of magnesium sulfate heptahydrate, magnesium sulfate nonhydrate, and magnesium sulfite hexahydrate. A ratio of the iron compound in the total amount of the iron compound and the magnesium compound is 5 to 80 mass%. The heavy metal insolubilizing material can be prepared in a powdery form.SELECTED DRAWING: None

The present application provides an electrode for a lithium ion secondary battery, the electrode having an active material layer containing a particulate active material, the active material containing an organic sulfur compound and an iron compound, wherein A S , A F , and D satisfy the following inequality (1) A S × A F × D > 7000, wherein A s represents the content of sulfur element in the active material, in mass%, A F represents the content of iron element in the active material, in mass%, and D represents the coating density of the active material, in mg / cm 2 The present application aims to improve the comprehensive performance of the charge-discharge capacity, capacity retention rate, and energy density of a lithium ion secondary battery.

This invention provides a method for simulating the preparation of an industrial iron-contaminated catalytic cracking catalyst. Step 1 involves reacting a first feedstock with a fresh catalytic cracking catalyst, stripping to remove hydrocarbons, then performing coke burn regeneration, followed by stripping and cooling. The treated catalytic cracking catalyst is then recycled with the first feedstock for a cycle of reaction, stripping, regeneration, and stripping, repeated at least once. Step 2 involves reacting a second feedstock with the catalytic cracking catalyst obtained in Step 1, stripping to remove hydrocarbons, then performing coke burn regeneration, followed by stripping and cooling. The treated catalytic cracking catalyst is then recycled with the second feedstock for a cycle of reaction, stripping, regeneration, and stripping, repeated at least once. Step 3 involves subjecting the catalytic cracking catalyst obtained in Step 2 to hydrothermal aging treatment. The first feedstock contains alkali metal compounds, alkaline earth metal compounds, and / or transition metal compounds other than iron, while the second feedstock contains iron-containing compounds.

A method for treating a gastrointestinal condition includes preparing an aqueous extract of bioactive compound by adding dried green tea material to hot water and filtering the aqueous extract; adding a solution of an iron-containing compound to the filtered aqueous extract to form a complex or chelate of the bioactive compounds with iron; and drying the solution at a temperature between 80 to 150 degrees Fahrenheit to obtain a fine granular or powdered state.

The invention discloses a self-supporting compound lithium ion battery electrode and a preparation method thereof. The preparation method of the self-supporting compound electrode comprises the following steps: (1) reacting a mixed aqueous solution of an iron-containing compound, a nickel-containing compound and urea with a conductive substrate to obtain a self-supporting substrate containing an iron / nickel precursor; and (2) carrying out annealing treatment on the self-supporting substrate containing the iron / nickel precursor in an ammonia gas atmosphere, cooling, and then purging and passivating by inert gas to obtain the self-supporting compound electrode loaded with the nano Fe3O4 / Ni3FeN. The preparation method provided by the invention is simple and low in cost, and the self-supporting electrode has good cycling stability and rate capability, is suitable for industrial large-scale production, and can be widely applied to the field of lithium ion battery materials.

The invention discloses a method for treating antibiotic wastewater by using a nano confinement iron cluster catalyst. The method comprises the following steps: mixing and pyrolyzing an iron-containing compound and a carbon and nitrogen-containing precursor to prepare the nano confinement iron cluster catalyst, and then, adding the catalyst and an oxidizing agent into antibiotic-containing wastewater to carry out catalytic oxidation reaction. According to the catalyst, a high-activity iron cluster is stabilized by utilizing a nano confinement effect, an oxidizing agent can be efficiently activated, antibiotics are rapidly degraded through a non-free radical path with synergistic singlet oxygen and electron transfer, and the catalyst shows excellent catalytic activity, cycling stability and adaptability to different water qualities. The method is simple in process, mild in condition and environment-friendly, and a new strategy is provided for efficient deep treatment of the antibiotic wastewater.

The invention discloses a method and a system for separating and recovering phosphorus and iron in a phosphorus-containing iron compound, and relates to the technical field of solid waste utilization. The method comprises the following steps: obtaining a crushed phosphorus-containing iron compound and a solid alkaline substance; the crushed ferrophosphorus-containing compound and the crushed solid alkaline substance are taken and placed in a reaction furnace, the ferrophosphorus-containing compound and the solid alkaline substance are fused and react to obtain a first mixed material, and the dosage of the solid alkaline substance is 1-1.2 times of the theoretical molar dosage; adding water into the first mixed material for leaching to obtain a first solid-liquid mixture, and performing solid-liquid separation on the first solid-liquid mixture to obtain a first filter cake and first filtrate; washing and drying the first filter cake to obtain a ferric oxide product; evaporating, concentrating, crystallizing and drying the first filtrate to obtain a phosphate finished product. The method provided by the invention has the advantages of environmental protection and high product quality.

The present invention discloses a Fe-N-C bifunctional catalyst and a preparation method and application thereof. The present invention adopts a synthesis strategy of calcination after a one-pot hydrothermal method, so that dianhydride and diamine are copolymerized with iron compounds while being connected and cyclized by hydrogen bonds, and the electrocatalytic performance and stability of the Fe-N-C oxygen reduction / oxygen evolution reaction bifunctional catalyst are improved by regulating hydrogen bonds. The bifunctional catalyst of the present invention shows excellent oxygen reduction / oxygen evolution reaction electrocatalytic performance under alkaline conditions, and has the advantages of simple preparation method, rich source of raw materials, easy industrial production, low cost, more uniform dispersion of iron elements, etc. Therefore, it has a wide range of application prospects in energy conversion devices such as fuel cells and metal-air batteries.

Provided is a novel method for producing an adsorbent comprising an iron compound and having a large adsorption capacity. An adsorbent having a specific surface area of 200 m2 / g or more, a primary particle size of 10 nm or less, an iron content of 450 g / kg or more, and a moisture content of 100 g / kg to 300 g / kg can be obtained by the method for producing an adsorbent, the method including: a first step for adding a polyferric sulfate aqueous solution to an alkali aqueous solution to form a slurry; a second step for adjusting the pH of the slurry to 5.0 to 9.0; and a third step for subjecting the slurry to solid-liquid separation, washing the obtained cake, and adjusting the moisture content of the washed cake.

The invention belongs to the technical field of food, and discloses a red date polysaccharide-iron compound and a preparation method thereof, and the compound comprises the following components by weight: 1-5 parts of red date polysaccharide; 5-20 parts by weight of a complexing agent; 15-30 parts by weight of a ferric iron compound; 5-15 parts by weight of alkali; and 200 to 300 parts by weight of deionized water. The red date polysaccharide-iron compound prepared by the invention has good dissolution performance, high stability and good solubility, and compared with a traditional iron supplementing agent, the red date polysaccharide-iron compound is more easily absorbed by an organism. In addition, the red date polysaccharide-iron compound has antioxidant activity in vitro. The preparation process is simple, the raw materials are rich in source, and the traditional Chinese medicine composition can be used for preventing or treating iron-deficiency anemia and provides a new choice for a novel iron supplementing agent.

The invention relates to a metallurgical treatment method of high-grade cobalt-containing copper sulfide concentrate, which comprises the following steps: carrying out first-stage presoaking on the cobalt-containing copper sulfide concentrate to obtain first-stage presoaking liquid and first-stage presoaking slag; grinding the first-stage presoaking residues until the particles of the first-stage presoaking residues are smaller than 200 meshes and account for 95 wt% or above, introducing oxygen, and performing second-stage presoaking to obtain second-stage presoaking liquid and second-stage presoaking residues; the copper grade of the cobalt-containing copper sulfide concentrate is 60 wt% or above. In the presoaking process, a large amount of copper oxide minerals and iron compounds are leached into a solution, so that the iron content in the presoaking residues is reduced, and generation of refractory substances such as copper ferrite is reduced; and compared with the raw ore amount, the ore amount is reduced by 40% or above, the follow-up recovery difficulty is remarkably reduced, and the leaching rate of the cobalt-containing copper sulfide concentrate is effectively increased.

The invention relates to the technical field of preparation of lithium ion battery positive electrode materials, in particular to an in-situ composite perovskite positive electrode active material and a preparation method and application thereof. The preparation method of the in-situ composite perovskite positive electrode active material comprises the following steps: mixing a lithium compound, a phosphate compound, a carbon source, a rare earth metal compound, a cobalt compound and / or a nickel compound with an iron compound or an iron compound and a manganese compound in a solvent to obtain mixed slurry; carrying out spray drying on the mixed slurry to obtain composite precursor powder; and sequentially carrying out pre-sintering treatment and formal sintering treatment on the composite precursor powder to prepare the in-situ composite perovskite positive electrode active material. Through the solution mixing and co-sintering process, the in-situ compounding of the perovskite phase and the positive electrode base material at the atomic scale is realized, the interface bonding and ion transmission efficiency between the perovskite phase and the positive electrode base material are remarkably enhanced, and the cycling stability is remarkably improved while the high capacity of the obtained positive electrode active material is maintained.

Provided herein are methods and compositions for producing cement and iron from non-carbonate materials. Methods include beneficiating a non-carbonate staring material to provide a calcium-rich and an iron-rich fraction, and treating the two fractions to produce cement and iron compound, respectively.

The invention relates to the technical field of energy storage batteries, battery swap stations, electric automobiles and large battery packs, and discloses a composition of a heterogeneous liquid fire extinguishing agent, the heterogeneous liquid fire extinguishing agent and a preparation method and application of the heterogeneous liquid fire extinguishing agent. The composition contains a phosphorus-containing ferrocenyl compound, a foaming agent, a penetrating agent, a flame retardant, a thickening agent, a dispersing agent, an adsorbent and water, wherein the structure of the phosphorus-containing ferrocenyl compound is shown as a formula (1). The phosphorus-containing ferrocene compound in the heterogeneous liquid fire extinguishing agent can be decomposed into iron atoms and phosphorus atoms after encountering flame, the iron atoms, the phosphorus atoms and free radicals in the flame are subjected to cyclic catalytic reaction, and the free radicals such as H, O and OH are continuously consumed until the flame disappears; the heterogeneous liquid fire extinguishing agent has cooling and fire extinguishing functions, terminates a thermal runaway reaction and prevents reburning; and meanwhile, the heterogeneous liquid can adsorb flammable and explosive gas and soot particles generated by combustion, so that the poisoning and explosion risks are reduced.

The invention relates to a positive electrode active material precursor for a lithium ion secondary battery and a method for producing the positive electrode active material precursor for a lithium ion secondary battery. A positive electrode active material precursor for a lithium ion secondary battery, the positive electrode active material precursor containing a metal composite hydroxide in the form of particles having a core-shell structure in which the surface is coated with an iron compound, the core-shell structure comprising a core part and a shell part, the core part containing nickel and aluminum as metal elements, and the shell part containing nickel and aluminum as metal elements. The core part contains iron as a metal element, when the composition of the core part is represented by Ni (1-x) Alx (OH) 2, 0.01 < = x < = 0.2, and the molar ratio (M2 / M1) of the molar amount (M1) of the metal element of the core part to the molar amount (M2) of the metal element of the shell part is M2 / M1 = 1 / 100-1 / 5.

Provided is an amorphous carbon-metallic iron composite which is safe and easy to handle, maintains activity for a long period of time, and is capable of sufficiently reducing organic halogen compounds contained in soil or underground water. An amorphous carbon-metallic iron composite which contains amorphous carbon and an iron compound that contains at least an alpha-iron phase, and wherein: the content of carbon in the amorphous carbon-metallic iron composite is 45-75% by weight (inclusive); the total of the content of an alpha iron phase and the content of an austenite (gamma iron) phase in the amorphous carbon-metallic iron composite is 7.5% by weight or more and 55% by weight or less.

Disclosed is a metal element recovery method which comprises: a step (1) for obtaining an acidic first solution by dissolving a metal in a crushed product of a lithium ion battery in an acidic aqueous solution; a step (2) for changing divalent iron ions in the first solution to trivalent iron ions; a step (3) for obtaining a second solution and a first precipitate that contains an iron compound or the like by adjusting the pH of the first solution to fall within the range of 3.0 to 5.0; a step (4) for obtaining a third solution and a second precipitate that contains copper sulfide by adding a sulfurizing agent to the second solution and adjusting the pH of the second solution to fall within the range of 4.0 to 5.0; a step (5) for obtaining a fourth solution and a third precipitate that contains nickel hydroxide or the like by adjusting the pH of the third solution to fall within the range of 7.0 to 8.5; and a step (6) for obtaining a fifth solution and a fourth precipitate that contains a lithium compound by concentrating the fourth solution while injecting a carbon dioxide gas thereinto.

White particles according to the present invention comprise amorphous silica derived from a phyllosilicate mineral and an aqua iron oligomer. This production method for the white particles includes preparing an aqueous raw-material dispersion containing a phyllosilicate mineral and an iron compound, regulating the pH of the aqueous raw-material dispersion to a value of -1 or larger but less than 0.3, and aging the aqueous raw-material dispersion while stirring.

The invention discloses a method for treating zinc smelting jarosite slag, which comprises the following steps: uniformly mixing the zinc smelting jarosite slag with biochar and calcium oxide source solid waste, roasting, and reducing an iron compound in the zinc smelting jarosite slag by using reducing gases such as H2, CO and CH4 generated by pyrolysis of the biochar, thereby obtaining the zinc smelting jarosite slag. And sulfur compounds in the iron vitriol slag are fixed through the added calcium oxide source solid waste to generate calcium sulfate, then air is introduced for continuous roasting, iron powder obtained through reduction is oxidized into ferroferric oxide, and finally ferroferric oxide powder is obtained through magnetic separation. The method not only is low in energy consumption, but also can reduce emission of greenhouse gas CO2 generated by incineration treatment of the biomass raw materials and release of sulfides in the iron vitriol slag.