29 results about "Calcium ferrite" patented technology

According to the system and the control method for improving the sinter quality of the sintering machine, the oxygen concentration in ignition combustion-supporting gas is actively and intelligently adjusted, and traditional passive adaptation is converted into active precise adjustment and control. And the mixing flow of the oxygen-enriched gas is dynamically adjusted according to monitored real-time data, so that the constant optimal ignition intensity is maintained. And then an optimized ignition system matched with oxygen-enriched ignition is designed, and generation of high-strength binding phase calcium ferrite is facilitated. And finally, through safety interlocking, when combustion-supporting air is abnormal, the oxygen content is too high and no coal gas is supplied, an oxygen-enriched pipeline stop valve needs to be closed, so that the system safety is guaranteed. The ignition uniformity and stability are improved, the ore return rate is effectively reduced, and a virtuous cycle is formed.

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 invention provides a composite layered sintered ore and a preparation method and system.The preparation method comprises the steps that lump coal is crushed and screened, and lump coal particles are obtained; uniformly mixing an iron-containing raw material, a CaO-containing flux and fuel to obtain an outer-layer mixed material; feeding the lump coal particles into a disc pelletizer, and spraying atomized water to the surfaces of the lump coal particles until the surfaces of the lump coal particles are wet; spraying calcium ferrite to the surfaces of the lump coal particles; the outer-layer mixed material is added into a disc pelletizer, atomized water is continuously sprayed for pelletizing, screening is conducted after pelletizing is finished, and a green pellet mixed material is obtained; conveying the green pellet mixture to a sintering machine, igniting the green pellet mixture, and sintering the green pellet mixture under the condition of injecting hydrogen-rich gas to obtain high-temperature sintered ore; hydrogen is adopted as a cooling agent to cool the high-temperature sintered ore, and pre-reduction of the high-temperature sintered ore is achieved in the cooling process. According to the invention, the composite layered sintered ore has high strength and air permeability, and the coke ratio can be reduced while the lump coal ratio in the ironmaking process is increased.

The invention provides a composite layered pellet and a preparation method and system.The preparation method comprises the steps that lump coal is crushed and screened, and lump coal particles with the particle size ranging from 10 mm to 15 mm are selected; uniformly mixing the dried iron ore powder with a pelletizing agent to obtain an outer-layer mixed material; feeding the lump coal particles into a disc pelletizer, and spraying atomized water to the surfaces of the lump coal particles until the surfaces of the lump coal particles are wet; spraying calcium ferrite to the surfaces of the lump coal particles; the outer-layer mixed material is added into a disc pelletizer, atomized water is continuously sprayed for pelletizing, screening is conducted after pelletizing is finished, and green pellets with the size being 25-30 mm are obtained; roasting the green pellets in an oxidizing atmosphere to obtain high-temperature pellets; and hydrogen is adopted as a cooling agent to cool the high-temperature pellets, and pre-reduction of the high-temperature pellets is achieved in the cooling process. According to the invention, the composite layered pellet has high strength and air permeability, and the coke ratio can be reduced while the lump coal ratio in the ironmaking process is increased.

The invention discloses a process for firing sulfuric acid and co-producing calcium ferrite from ardealite, which specifically comprises the following steps: uniformly mixing ardealite with auxiliary materials such as sulfuric-acid residue, high-silicon material, pulverized coal and the like, preparing into a block mass, distributing, drying, roasting and cooling, the drying is divided into an air draft drying section and a forced air drying section, the drying hot air comes from circulating flue gas of different cooling sections, and the air draft drying section and the forced air drying section are communicated with the air draft drying section; the comprehensive energy consumption is effectively reduced, flue gas of a roasting section is derived from waste gas of a forced air drying section, SO2 in the flue gas can be enriched while flue gas circulation is achieved, high-sulfur flue gas is obtained, sulfuric acid is prepared through purification, conversion and absorption of the obtained high-sulfur flue gas, and calcium ferrite is obtained after an obtained solid roasted product is cooled. And resource recycling of calcium and sulfur in the phosphogypsum and iron and sulfur in the sulfuric-acid slag is realized with relatively low energy consumption.

This invention relates to the field of solid waste cementitious material preparation technology, specifically to a rapid-setting and hardening cementitious material based on calcium aluminoferrite from all solid waste and its preparation method, comprising the following steps: S1. Mixing and stirring modified red mud, carbide slag, mineral powder, and modified mineralizer evenly, and then pressing into shape; S2. Performing a first-stage calcination, calcining from room temperature to 950-1000℃, and then performing a second-stage calcination to 1220-1300℃ and holding at that temperature for 30-120 minutes, and cooling to room temperature to obtain modified mineral phase clinker; S3. Passing through a 200-mesh square hole sieve, mixing with modified multi-element solid waste mineral materials in a mixer, and stirring evenly to obtain the rapid-setting and hardening cementitious material based on calcium aluminoferrite from all solid waste. This invention significantly reduces the calcination temperature of clinker through the synergistic effect of various raw materials, thereby greatly reducing energy consumption and carbon emissions. The complex ionic reaction mechanism and the complementary physicochemical properties of multi-component solid waste enrich the diversity of hydration products and the density of the gel structure, thus ultimately achieving the excellent performance of "fast setting, fast hardening, and high strength" of the all-solid waste cementitious material.

The application relates to the technical field of wave-absorbing materials, in particular to a wide-band calcium ferrite wave-absorbing material and a preparation method and application thereof. 1.8 La 0.2‑x Ce x Fe2O5, wherein 0<=x<0.14. The application solves the problems of narrow absorption frequency band and low efficiency of the oxide wave-absorbing material by adjusting the composition and dielectric properties of the material through La and Ce double-element co-doping, and the prepared material has the advantages of wide absorption frequency band and high absorption intensity.

The invention belongs to the technical field of ironmaking production, and relates to a whole concentrate sintering method. Comprising the following steps: (1) preparing a mixture A1 from ferroboron concentrate, brucite fiber, calcium ferrate, calcium peroxide and rare earth tailings, uniformly mixing, and grinding to prepare a sintering aid A; (2) preparing a mixture B1 from limestone powder, blast furnace fly ash, brucite fibers, magnesium humate and bentonite, uniformly mixing, and grinding to prepare a sintering binder B; (3) adding a sintering aid A and activated carbon powder into the iron ore concentrate to form a mixture C1, uniformly mixing and carrying out high-pressure roller milling to prepare pretreated ore concentrate C; (4) mixing the pretreated concentrate C, a fuel and an alkaline flux to form a mixture D1, adding a sintering binder B, uniformly mixing, and granulating to obtain a sintered material D; and (5) distributing, igniting and sintering to obtain a finished product sintered ore. According to the sintering method, the air permeability of a sintered material layer can be improved, the mineralization reaction condition of the sintered material is improved, the whole concentrate sintering index is improved, and the whole concentrate sintering solid fuel consumption is reduced.

The application discloses a sintering oxidation catalyst for high-ratio magnetic concentrate and a use method thereof, which is composed of a sintering oxidizing agent and a sintering catalyst, and the preparation raw materials of the oxidizing agent include, in terms of weight fractions, 30-55 parts of calcium peroxide, 25-45 parts of magnesium peroxide, 2-15 parts of potassium permanganate and 2-12 parts of calcium ferrite; and the preparation raw materials of the sintering catalyst include, in terms of weight fractions, 30-60 parts of dolomite, 20-40 parts of iron powder, 10-20 parts of rare earth tailings and 5-15 parts of sintering dust removal ash. The sintering oxidation catalyst is prepared, the oxidizing agent adding proportion is optimized according to the high-low ratio of iron concentrate and the poor oxidation difference of the magnetic concentrate, the oxidation reaction capacity of the iron concentrate is improved, the sintering catalyst is prepared, the combustion efficiency of the solid fuel is improved, the sintering oxidation kinetics condition of the high-ratio magnetic concentrate is improved, and the sintering production efficiency and the sinter quality are improved.

The application discloses a method for preparing calcium ferrite from vanadium-containing steel slag and calcium ferrite. The method comprises the following steps: directly injecting the molten vanadium-containing steel slag into an electric furnace; performing smelting treatment on the molten vanadium-containing steel slag in the electric furnace; performing air quenching treatment on the molten material after smelting to obtain granular material; and performing magnetic separation treatment on the granular material to separate and obtain steel slag powder and composite calcium ferrite. The scheme provided by the application directly uses the molten vanadium-containing steel slag as raw material, does not need to perform pretreatment such as cooling and crushing on the steel slag, fully utilizes the sensible heat of the molten steel slag, reduces heating energy consumption, and saves production cost. Meanwhile, the particle size of the material after the air quenching treatment is controllable, the proportion of fine powder is high, the magnetic separation efficiency is high, the process operation is simple, the process is short, and the scheme is suitable for industrial large-scale application. Thus, the high-value and resource utilization of the vanadium-containing steel slag, a metallurgical solid waste, are realized, and the environmental problems caused by the storage of the solid waste are reduced.

The application provides a method for synchronously preparing a metallurgical dephosphorizing agent by gasifying flue gas of a calcium-based reinforced metallurgical furnace and desulfurizing flue gas, and belongs to the technical field of metallurgical energy-saving and environmental protection. The method uniformly loads calcium-based materials on coal gasification raw materials through pretreatment loading, sprays the calcium-based materials into a metallurgical furnace gasification flue through a spraying system on the metallurgical furnace gasification flue, realizes coal gasification under the action of high-temperature flue gas, and the loaded calcium-based materials play a role in strengthening organic fuel cracking gasification in the process. Meanwhile, sulfur-containing flue gas released by the organic fuel is solidified by the calcium-based materials, the solidification products enter a dust removal system with dust, the calcium-based materials react with iron-containing components in the dust in the metallurgical furnace gasification flue to generate calcium ferrite with dephosphorizing metallurgical performance, and the calcium ferrite enters the dust removal system with the dust. The collected dust removal ash is used for high-value dephosphorizing agent production after being separated and purified through magnetic separation, and provides an effective way for the sustainability and economical production of the metallurgical industry.

The application provides a high-temperature tempering method for improving strong magnetic phase of steel slag, and relates to the technical field of steel slag resource utilization. The method is suitable for fresh molten steel slag or steel slag powder generated in a steelmaking workshop. The steel slag is placed in an environment with a temperature of 1000-1300 DEG C, 6%-14% of the mass of the steel slag is added with graphite or coke, and the mixture is stirred uniformly and kept for 10-90 min, and then the mixture is cooled. The operation can convert the weakly magnetic RO phase component and calcium ferrite component in the steel slag into strong magnetic phase such as metallic iron or magnetite, thereby improving the magnetism of the iron component in the steel slag, and further improving the subsequent magnetic separation effect, helping the iron recovery of the steel slag; and the steel slag with high activity and mainly composed of calcium silicate phase is obtained, which lays a foundation for the subsequent application of the steel slag in preparing low-carbon cementitious materials and the like. The method is simple and easy to operate, low in cost and energy consumption, and high in efficiency, and is beneficial to large-scale industrial production and popularization.

This invention relates to the field of solid waste cementitious material preparation technology, specifically to a rapid-setting and hardening cementitious material based on calcium aluminoferrite from all solid waste and its preparation method, comprising the following steps: S1. Mixing and stirring modified red mud, carbide slag, mineral powder, and modified mineralizer evenly, and then pressing into shape; S2. Performing a first-stage calcination, calcining from room temperature to 950-1000℃, and then performing a second-stage calcination to 1220-1300℃ and holding at that temperature for 30-120 minutes, and cooling to room temperature to obtain modified mineral phase clinker; S3. Passing through a 200-mesh square hole sieve, mixing with modified multi-element solid waste mineral materials in a mixer, and stirring evenly to obtain the rapid-setting and hardening cementitious material based on calcium aluminoferrite from all solid waste. This invention significantly reduces the calcination temperature of clinker through the synergistic effect of various raw materials, thereby greatly reducing energy consumption and carbon emissions. The complex ionic reaction mechanism and the complementary physicochemical properties of multi-component solid waste enrich the diversity of hydration products and the density of the gel structure, thus ultimately achieving the excellent performance of "fast setting, fast hardening, and high strength" of the all-solid waste cementitious material.

A dicalcium ferrite (Ca2Fe2O5) / calcium ferrite (CaFe2O4) / iron oxide (Fe2O3) nanocomposite material includes orthorhombic Ca2Fe2O5 phases, orthorhombic CaFe2O4 phases, and rhombohedral Fe2O3 phases. The Ca2Fe2O5 / CaFe2O4 / Fe2O3 nanocomposite material has a granular morphology with an average grain size in a range from 200 to 400 nanometers (nm) and the granular morphology includes spherical particles aggregated together forming the granular morphology where the spherical particles have an average particle diameter in a range from 40 to 80 nm.

The invention belongs to the crossing field of solid waste resource utilization and novel cementing materials, and particularly relates to an aluminum-rich activator for accelerating hydration of converter slag, a converter slag cementing material and application, and the activator is soluble metaaluminate capable of hydrolyzing [Al (OH) 4] <->. The activator can regulate and control the Al / Fe ratio in a converter slag system, so that the traditional hydration path of dicalcium silicate is changed, and synergistic excitation of dicalcium silicate and calcium aluminoferrite is realized. The early-stage hydration reaction activity of the converter slag can be remarkably improved, so that the early-stage and later-stage compressive strength is remarkably improved. Therefore, the metaaluminate excitant can greatly accelerate the development of early strength and obviously enhance the final mechanical property. The compactness of hardened slurry is improved, so that a microstructure foundation is provided for improving the mechanical property and durability. Effective solidification of heavy metal is achieved, and the core problems of low early strength and heavy metal precipitation in the converter slag resource utilization process are solved.

This invention discloses a method for preparing calcium ferrite from iron-based solid waste through low-temperature catalytic decomposition of phosphogypsum, belonging to the field of comprehensive utilization of solid waste. The method involves mixing, granulating, and roasting raw materials, including iron-based solid waste and phosphogypsum, to obtain calcium ferrite-containing sintered material. The roasting process involves feeding the material onto a belt roaster, first performing reduction roasting under a reducing atmosphere, and then performing oxidative roasting under an oxidizing atmosphere. This method fully utilizes the mineral composition characteristics of iron-based solid waste and phosphogypsum from the steel industry. By controlling the temperature and atmosphere during the high-temperature solid-phase reaction, the method achieves the directional transformation of iron and calcium components in the two industrial solid wastes into calcium ferrite-based products, while effectively removing harmful elements, resulting in high-quality calcium ferrite products.

The invention provides a comprehensive evaluation method for the high-temperature metallurgical performance of vanadium-titanium sinter for a blast furnace, and belongs to the technical field of steel smelting. Carrying out dimensionless grading treatment on the data of the tested sample; establishing a comprehensive evaluation index H of the high-temperature metallurgical performance, the calcium ferrite content w of the vanadium-titanium sinter, the total indirect reduction degree sigma Ri, the air permeability characteristic value Da of a melting zone, the soft melting temperature interval delta Ts and the melting finishing temperature Tm; evaluating the high-temperature metallurgical performance of the to-be-measured vanadium-titanium sinter according to the H value; a plurality of key parameters such as the calcium ferrite content, the total indirect reduction degree, the melting zone air permeability characteristic value, the soft melting temperature interval and the melting finishing temperature are introduced, and after dimensionless grading is conducted, a comprehensive evaluation index H is established, so that the high-temperature metallurgical performance of the vanadium-titanium sinter is comprehensively reflected, and the high-temperature metallurgical performance of the vanadium-titanium sinter is improved. The problem that complex reaction conditions in the blast furnace are difficult to accurately reflect by a traditional method is solved.

Provided is a blast furnace operation method with which it is possible to reduce CO2 emissions. A method for operating a blast furnace in which molten iron is produced by supplying a gaseous reducing agent from the lower part of a blast furnace while charging an artificial lump ore from the top of the blast furnace, the amount of supply of the gaseous reducing agent being 100 Nm3 / t or more, and the phase fraction of a calcium ferrite phase or a secondary hematite phase of the artificial lump ore being within a predetermined range.

The invention provides a process for producing zinc hypoxide from zinc-containing waste through a rotary kiln reduction fuming method, and belongs to the technical field of zinc hypoxide production. The method comprises the following steps: mixing blast furnace gas ash with activated aluminum oxide, calcium ferrite and anthracite duff to prepare composite pellets; in a rotary kiln, the pellets utilize a temperature gradient formed by countercurrent heat exchange to sequentially trigger reactions of three stages: firstly, alkali metal is fixed in situ through activated aluminum oxide in a low-temperature area to prevent ring formation; then, reducing activation energy of a carbon gasification reaction in a medium-temperature region by utilizing the catalytic action of calcium ferrite, activating and accelerating the reaction of carbon and carbon dioxide, and reacting with non-volatile components in a high-temperature region to form stable slag; and finally, the zinc oxide is efficiently reduced into zinc steam in the high-temperature area, the zinc steam is oxidized into secondary zinc oxide dust by the oxidizing atmosphere in the upper space in the kiln, and the secondary zinc oxide dust enters a rear-end system along with flue gas to be cooled and collected.

This invention provides a ground improvement material that can reduce CO2 emissions and a method for manufacturing the same. [Solution] A ground improvement material comprising a solidifying agent containing blast furnace slag fine powder and steelmaking slag fine powder, and water, wherein the steelmaking slag fine powder contains at least one or more of the following: free lime, calcium hydroxide, calcium ferrite, calcium silicate, and dicalcium silicate.

This invention discloses a production method, the resulting product, and its application in the field of iron and steel metallurgical technology, which utilizes the waste heat from steel slag for temperature control. The invention calculates the amount of siderite that can be added based on the temperature and mass of the steel slag, then places the siderite on top of the liquid steel slag. It calculates the corresponding slag temperature during slag cooling and adds coke tailings at 1210℃ and 600℃, with the amount of coke added being 5% of the siderite mass. After crushing and cooling, the steel slag is magnetically separated to obtain iron ore. The remaining non-magnetic steel slag is the slagging agent, with calcium ferrite as its effective component. This invention utilizes the absorption of waste heat from steel slag by siderite, combined with temperature control, to efficiently recover waste heat from steel slag and process siderite at low cost. The resulting products are iron ore and a slagging agent that can be directly fed into the furnace, bringing significant economic value to enterprises and making a significant contribution to energy conservation and emission reduction in the steel industry.

The invention discloses a method for preparing calcium ferrite and co-producing sulfuric acid by using titanium gypsum, which comprises the following steps: reacting titanium gypsum with an ammonium salt solution to obtain a solid-phase product I and an ammonium sulfate solution, carrying out liquid-solid separation, and carrying out calcination reaction on the solid product I and an iron-containing material to obtain a calcium ferrite product and CO2. The method comprises the following steps: carrying out evaporative crystallization on an ammonium sulfate solution to obtain a solid product II and water, mixing the solid product II with ferric oxide, carrying out primary calcination to obtain a solid product III and ammonia water, carrying out secondary calcination on the solid product III to obtain ferric oxide and SO2, recycling ferric oxide, and using sulfur dioxide for preparing acid. CO2 and ammonia water are combined to generate an ammonium salt solution, and the ammonium salt solution is recycled. According to the method, resource recycling and innocent treatment of the titanium gypsum are achieved, meanwhile, collaborative recycling and closed-loop recycling of resources such as calcium, iron, sulfur and carbon are achieved, emission of solid waste and secondary salt is remarkably reduced, the emission intensity of pollutants such as sulfur dioxide and carbon dioxide is reduced, and the obtained calcium ferrite product is high in purity.

This invention provides a ground improvement material that can reduce CO2 emissions and a method for manufacturing the same. [Solution] A ground improvement material comprising a solidifying agent containing either cement or slaked lime, blast furnace slag fine powder and steelmaking slag fine powder, and water, wherein the steelmaking slag fine powder contains at least one or more of the following: free lime, calcium hydroxide, calcium ferrite, calcium silicate, and dicalcium silicate.

The invention discloses a lepidolite treatment method for synergistically extracting lithium and solidifying thallium from metal-rich lepidolite and a method for extracting lithium and / or rubidium, cesium and potassium, and belongs to the field of hydrometallurgy. The method comprises the following steps: firstly, selectively crushing lepidolite by adopting a shear type mill, so that the lepidolite is longitudinally broken along an interlayer to expose metal ions; mixing the crushed fine powder with an activating agent, a calcium-based fluorine fixing agent and a pore forming agent for pelletizing; two-step roasting is conducted, firstly, pores are formed in the pellets through decomposition of a pore forming agent at the low temperature, then a replacement reaction and a thallium fixing reaction are conducted at the high temperature in the air atmosphere, and thallium is oxidized and fixed in a stable calcium ferrite / iron calcium silicate phase; and finally leaching, separating and recovering lithium, rubidium, cesium and potassium. According to the method, through multi-stage cooperation of physical exposure, pore-forming mass transfer and atmosphere regulation and control, the industrial problem that the leaching rate of the valuable metal and the thallium curing rate are difficult to consider at the same time is fundamentally solved, the process is clean and efficient, and remarkable economic and environmental benefits are achieved.

The application discloses a method for changing the properties of steel slag at high temperature to improve the internal circulation rate in the field of steel metallurgy, and aims to solve the problems of uneven mixing of existing steel slag modification, low alkalinity control precision, poor adaptability to internal circulation sintering process and the like. The method comprises three steps of raw material pretreatment, high-temperature conditioning test and sample treatment and detection: first, the converter steel slag is crushed, screened and dried, and high-grade iron ore powder is synchronously treated; then the steel slag is high-temperature melted, 10% of the iron ore powder by mass is added in batches for stirring and reaction, the alkalinity of the molten steel is controlled to 1.8-2.2, and the modified steel slag is obtained through heat preservation and cooling; finally, the conversion of calcium silicate phase to calcium ferrite phase is verified through XRD and SEM-EDS. The high-quality calcium ferrite is directionally generated, the melting point of the steel slag is reduced, the internal circulation rate is improved, the modified steel slag can replace the sintering flux and fuel, the sensible heat of the steel slag is utilized in situ, no additional heating is needed, energy is saved and carbon emission is reduced, the method can be realized by relying on the existing equipment, and helps the large-scale disposal of steel slag solid waste.

The invention discloses a method for predicting the low-temperature reduction degradation performance of sintered ore based on ore phase analysis, and belongs to the technical field of sintered ore production. The method comprises the following steps of: acquiring ore phase composition proportions of magnetite, primary hematite, secondary hematite, calcium ferrite, dicalcium silicate, glass phase and the like of corresponding analysis samples and porosity data of the corresponding samples through an automatic optical image analysis system by utilizing gray-based multi-threshold mineral identification and mineral morphology identification; meanwhile, the RDI + 3.15 index of the corresponding sintered ore is obtained, and the RDI + 3.15 index serves as a dependent variable to construct a prediction model. According to the method, the RDI + 3.15 index of the corresponding sintered ore can be obtained through automatic optical image analysis of the ore phase and the constructed prediction model, traditional sintered ore low-temperature reduction performance detection is replaced, and therefore the problems that analysis steps are tedious, the waiting period is long, and testing conditions are complex are solved.

The application discloses a phosphogypsum resource comprehensive utilization method and application thereof, and belongs to the technical field of phosphogypsum resource utilization. The method comprises the following steps: S1, mixing phosphogypsum and a reducing agent to obtain a mixture; S2, performing high-temperature decomposition treatment on the mixture under an inert atmosphere to obtain a decomposition gas and a decomposition product; and S3, preparing sulfuric acid and / or carbon disulfide by using the decomposition gas as raw material, and using the decomposition product for metallurgical steelmaking. The application realizes comprehensive utilization of calcium and sulfur resources of phosphogypsum solid waste by using ferrous sulfide as a reducing agent and reducing the phosphogypsum into calcium oxide and calcium ferrite under an inert atmosphere, and recovers generated sulfur dioxide tail gas. The recovered sulfur dioxide can be used for preparing sulfuric acid and / or carbon disulfide, meanwhile, the calcium oxide and calcium ferrite can be used as a binder and a slagging agent for efficient metallurgical steelmaking, and the phosphogypsum resource comprehensive utilization method has a good application prospect.

The invention belongs to the technical field of metallurgical resource recycling, and particularly relates to a method for high-selectivity separation of phosphorus in steel slag and production of a metallurgical sintering raw material and a phosphate fertilizer. The method comprises the following steps: by taking ammonium citrate as a leaching agent, selectively dissolving a 2CaO. SiO2-3CaO. P2O5 solid solution in the steel slag under a nearly neutral condition by utilizing the strong coordination capability and pH buffer characteristic of citrate radicals of the ammonium citrate to Ca < 2 + >, and meanwhile, inhibiting the dissolution of phases such as calcium ferrite and the like, so that efficient separation of phosphorus and effective retention of calcium and iron are realized; leaching to obtain a phosphorus-rich leaching solution and leaching residues rich in iron and calcium; adding ammonia and precipitating to obtain a phosphate fertilizer, and introducing CO2 to precipitate calcium carbonate; the calcium carbonate and the leached residues are mixed to prepare a metallurgical sintering raw material, and the regenerated leachate can be recycled; the method is operated at the room temperature, steel slag modification is not needed, the phosphorus leaching rate is larger than 90%, the iron leaching rate is smaller than 5%, the alkalinity of the leached slag is larger than 3, all-component resource utilization of the steel slag and zero emission in the technological process are achieved, and remarkable economic and environmental benefits are achieved.