190 results about "Iron(III) oxide" patented technology

The invention provides a production process for stably controlling adhesive force of a DP steel zinc layer. The production process comprises the following steps: step 1, setting a heating section 1, a heating section 2 and a furnace nose section in a total radiation heating annealing furnace; 2, according to the model and thickness of DP steel, target dew points of a first heating section, a second heating section and a furnace nose section are set; 3, according to the target dew points set in the first heating section, the second heating section and the furnace nose section in the step 2, water vapor is put into the protective gas for humidification, and the water vapor reacts with Si, Mn and Cr elements enriched on the surface of the steel plate to generate volatile oxides; the dew point of the annealing furnace is precisely controlled in a segmented mode, different humidification modes are adopted, and the surface state is controlled, so that surface oxide residues are reduced, cleanliness of a steel substrate is guaranteed, and the binding force of a zinc layer is improved; the iron oxide layer formed on the surface of the steel plate enters a reducing atmosphere annealing furnace containing hydrogen, the hydrogen can reduce the iron oxide layer on the surface of the steel plate to form a reduced iron layer, and the adhesive force of a zinc layer is improved.

The invention provides coal gangue-based artificial soil as well as a preparation method and application thereof. The preparation method of the coal gangue-based artificial soil comprises the following steps: S1, modifying coal gangue by adopting a solution containing citric acid and ethylenediamine tetraacetic acid to obtain modified coal gangue; s2, preparing the modified coal gangue into artificial soil. According to the invention, the citric acid can dissolve carbonate in the coal gangue, the released carbonate can be combined with heavy metals, and citrate ions and ferric ions can form a complex to destroy the outer layer of ferric oxide of the heavy metals; ethylenediamine tetraacetic acid can permeate into mineral lattices of the coal gangue, lattice bound state heavy metal is released through octahedral Al-O bond breakage, the ethylenediamine tetraacetic acid can capture heavy metal combined with citric acid, a more stable heavy metal complex is formed, the heavy metal complex carries strong negative charges, and the heavy metal complex can be separated from the coal gangue. And electrostatic repulsion can be generated on the surface of the coal gangue with negative electricity, so that the heavy metal removal effect is improved.

According to the red mud-based composite material and the preparation method and application thereof, bentonite, red mud and biomass are mixed in a proper amount of water according to the mass ratio of 1: 1: (1-10), and first suspension liquid is formed; drying the first suspension to obtain a precursor of the red mud-based composite material; the precursor is subjected to a carbon thermal reaction at 300-700 DEG C, ferric oxide in the red mud is converted into zero-valent iron, and the red mud-based composite material is obtained. The red mud is alkaline and promotes manganese ions to form insoluble precipitates, the unique structure and ion exchange capacity of the bentonite can effectively solidify the manganese ions, the biomass has a high specific surface area and a developed pore structure, and the manganese ions are physically adsorbed through Van der Waals' force and pore interception; ferric oxide in the red mud is converted into zero-valent iron in the carbothermal reaction process, and the zero-valent iron can catalytically oxidize ammonia nitrogen, so that the red mud-based composite material synchronously solves the problem of combined pollution of manganese and ammonia nitrogen in the soil.

The invention relates to a process for preparing pure iron by using red mud, which is characterized in that the red mud is Bayer process red mud, i.e., solid waste residue formed by solid-liquid separation after aluminum oxide is dissolved out from bauxite through high temperature, high pressure and strong alkali in the process of producing aluminum oxide by adopting a Bayer process, so that the environmental burden caused by the Bayer process red mud can be solved; the method is beneficial for reducing carbon emission in the aspect of iron element extraction and promoting development of a green metallurgical technology, and is characterized by comprising the following steps: taking Bayer process red mud as a raw material, carrying out acid leaching on the Bayer process red mud to obtain a ferrous oxalate extract, calcining the ferrous oxalate to obtain iron oxide, and recycling the iron oxide. And dissolving the ferric oxide into a sulfuric acid solution to obtain a ferric sulfate solution, taking the ferric sulfate solution as an electrolyte in an electrolysis device, and obtaining electrolytic iron through the electrolysis device, so that the pure iron is prepared from the red mud.

At least one embodiment of the invention provides a preparation method of sponge titanium, which comprises the following steps: pretreating bauxite tailings to obtain a first mixture; carrying out acid treatment on the first mixture, and filtering to obtain a second mixture; putting the second mixture into a reaction kettle containing an alkaline substance to react so as to convert the ferric titanate into titanate and ferric oxide or ferrous hydroxide to obtain a third mixture; carrying out suction filtration treatment on the third mixture to obtain a first solid phase and a first liquid phase, and drying and grinding the first solid phase; roasting the dried and ground first solid phase to form an iron elementary substance, and carrying out magnetic separation to remove the iron elementary substance; adding an acidic material into the first liquid phase for reaction to obtain metatitanic acid colloid, and washing the metatitanic acid colloid; the metatitanic acid colloid is subjected to calcination, chlorination reaction and replacement reaction in sequence to obtain the sponge titanium. The sponge titanium obtained through the preparation method is high in purity.

The application discloses a kind of iron oxide / nickel ferrite composite nanorods and synthesis method thereof, belong to nanometer material technical field.The obtained composite nanorod is polycrystalline structure, and is composed of rhombohedral Fe2O3 and cubic NiFe2O4 crystal phase.The diameter of the composite nanorod is 10-100nm, and the length is greater than 500nm.The synthesis method is that iron acetate and nickel acetate are dissolved in deionized water, heated to temperature 80-100 DEG C, and kept for 1-5h, and iron oxide / nickel ferrite precursor is obtained after cooling and drying;iron oxide / nickel ferrite precursor is mixed with calcium chloride and sodium chloride, then the mixture is loaded into corundum crucible, the crucible is placed in reaction furnace, at temperature 800-1000 DEG C, and kept for 5-10h.The synthesis process of the application is simple, does not need complex equipment, and is easy to control.Iron oxide / nickel ferrite composite nanorod has a large number of catalytic active sites, and is expected to have good interface performance, catalytic activity, electrical and magnetic properties, and has good application prospect in catalysts, electrical devices and magnetic devices.

The invention provides a method and system for detecting the corrosion degree of a wire steel core of an overhead transmission line, and the method comprises the steps: carrying out the multi-angle X-ray transmission of a whole to-be-detected wire in an electrified state, and obtaining a projection sequence; inverting the projection sequence into a steel core three-dimensional density body, segmenting and identifying the steel core, the air and the corrosion area based on the steel core three-dimensional density body, and calculating the corrosion sectional area loss rate of the steel core; the chemical state of the Fe element is obtained in the corrosion area, satellite peaks of Fe-K alpha and iron oxide are collected respectively, and the concentration ratio of Fe < 0 > to Fe < 3 + > is calculated; according to the steel core corrosion sectional area loss rate and the concentration ratio of Fe < 0 > to Fe < 3 + >, the corresponding corrosion grade and residual strength of the wire to be detected are output, and the problems that in the prior art, the detection efficiency and reliability of the steel core corrosion degree of the wire of the overhead transmission line are not high are effectively solved. And the detection efficiency and reliability of the corrosion degree of the wire steel core of the overhead transmission line are effectively improved.

This invention relates to the field of iron and steel metallurgy and proposes a method for controlling the corrosion-resistant iron oxide scale on the surface of hot-rolled steel plates. The method includes the following steps: First, molten steel is smelted and cast into steel billets; then, the steel billets are heated to 550-600℃ and held at an air-fuel ratio of 1.1-1.3 for 20-30 minutes; subsequently, the temperature is raised to 1100-1150℃ and held at an air-fuel ratio of 1.0-1.1 for 40-60 minutes; finally, the temperature is raised to 1180-1220℃ and held at an air-fuel ratio of 0.9-1.0 for 20-30 minutes to obtain the heated steel billet; the heated steel billet is then hot-rolled and cooled to obtain the steel plate. This technical solution solves the problems of uneven iron oxide scale growth and poor adhesion to the matrix in related technologies.

The application discloses a production method for controlling the thickness of iron oxide scale of free-cutting steel, and the process steps are as follows: hot metal pretreatment, converter steelmaking, CAS treatment, LF furnace external refining, continuous casting, heating furnace heating, rolling, controlled cooling, coil collecting and finished product inspection. The composition and thickness of the surface iron oxide scale of the free-cuting steel wire rod are controlled by controlling the wire drawing temperature and the post-rolling cooling speed, the wire drawing temperature is ensured to be below 860 DEG C by adjusting the water amount of the water tank after the finishing mill, the Fe2O3 red rust is generated on the surface of the wire rod, and the proportion of Fe3O4 in the iron oxide scale on the surface of the wire rod is prevented from being increased due to the excessively high wire drawing temperature. The wire drawing temperature and the post-rolling cooling speed are controlled in the application, the red rust-like iron oxide scale is formed on the surface of the free-cutting steel wire rod, the thickness of the iron oxide scale on the surface of the free-cutting steel wire rod is controlled to be below 12 microns, the inclusions and the banded structure are uniformly distributed, and the application is suitable for producing the free-cutting steel with the specifications of 6.5-17 mm and S=0.28%-0.40%.

The invention discloses a dezincification process for steelmaking dust sludge of a rotary kiln, and belongs to the technical field of metallurgical solid waste resource utilization. According to the method, Fe2O3 in the dust sludge is preliminarily reduced into Fe3O4 and a small amount of FeO through the coke powder, H2 is generated through lignite pyrolysis to replace part of C for reduction, and efficient reduction and separation of zinc and iron in the dust sludge through carbon-hydrogen compounding in the rotary kiln are achieved. According to the method, the brown coal is excessively added, so that ferric oxide in the raw materials is fully reacted, meanwhile, oxygen is isolated by controlling the state of the kiln head, kiln slag is recycled after being cooled, FeO is prevented from being formed again, the ring forming phenomenon of the rotary kiln is relieved, and then the continuous working time of the rotary kiln is prolonged.

The invention discloses a method for reducing steel material consumption based on oxide scale for a converter, which comprises the following steps: transferring dry oxide scale to a converter overhead bunker on an underground bunker, and adjusting a bunker turn plate by the converter according to the blanking condition of the bunker; weighing 1.5-2t of oxide scale in the slag splashing period of the converter, adding the oxide scale after adding the waste steel, and controlling the speed of a dust removal fan; in the converter smelting process control, 70% of the total amount of converter blowing lime is added, and the rest 30% of the lime is added in the smelting process; meanwhile, converter smelting lance position adjustment is conducted in the early stage and the middle stage of smelting and when the oxygen content reaches 6800 Nm < 3 > through smelting; setting oxygen flow; controlling residual slag; and controlling a bottom blowing mode. The method has the advantages that negative effects caused by use of the oxide scale are avoided, the use amount of the oxide scale is increased, the use amount of pellets is reduced, converter smelting slagging is facilitated, the dephosphorization efficiency is improved, meanwhile, steel and iron material consumption is effectively reduced, and the converter production cost is reduced.

The invention relates to an aluminothermy welding flux for a zinc-clad steel grounding material and a welding method of the aluminothermy welding flux, and belongs to the technical field of metal material welding. In order to solve the core technical problem that joint potential matching and welding firmness compatibility are difficult to realize by an existing aluminothermy welding flux for the zinc-clad steel grounding material, the invention provides the aluminothermy welding flux for the zinc-clad steel grounding material. The aluminothermy welding flux comprises iron oxide powder, aluminum powder, tin powder and nickel powder. According to the invention, the iron-based welding flux is compounded with tin and nickel, and the tin and the nickel have a synergistic effect, so that the technical prejudice that the iron-based welding flux is difficult to adapt to zinc-clad steel welding in the field is overcome, and the unexpected technical effect is realized. The tensile strength of the connector is larger than or equal to 620 MPa, the corrosion rate is smaller than 0.05 mm / year, the conductivity loss is smaller than 5%, and the performance is obviously superior to that of a copper-based connector. The problem of compatibility of potential matching and welding firmness is fundamentally solved, galvanic corrosion is eliminated, the process is simple and convenient, the cost is controllable, and corrosion prevention and engineering reliability are greatly improved.

The application discloses a method for preparing an ozone catalyst by using iron oxide scale waste residues as raw materials and application thereof. By using the iron oxide scale waste residues as the ozone catalyst, various organic pollutants in water can be efficiently degraded, and the method has good industrial application value. It is found through experiments that the IOS waste residues without any treatment can be directly used as the ozone catalyst, or the IOS waste residues can be treated by means of bagging, ball milling and briquetting, urea doping and the like, and high-efficiency O3 catalysts can be obtained, the catalysts can efficiently catalyze low-concentration O3, and the effective degradation of high-concentration tetracycline in water can be realized within 12 min, and the degradation rate is 90%. The iron oxide scale block and the IOS waste residues doped with urea have the best activity, good stability and easy recycling. The above results show that the solid waste, the iron oxide scale, which is inevitably produced in the steel production process, is used as the high-efficiency catalyst of O3, the problem of resource utilization of the iron oxide scale waste residues is properly solved, and a kind of ozone water treatment technology with good industrial application prospect is developed.

The application relates to a preparation method of a 980MPa-grade steel plate with high surface quality in a headless mode, and belongs to the technical field of steel preparation; the method comprises the following steps: heating and descaling a casting blank; rolling the casting blank after the heating and descaling, so as to obtain a strip steel, wherein the rolling comprises finish rolling, and the inlet temperature of the finish rolling is 1180-1220 DEG C; coiling the strip steel, so as to obtain a 980MPa-grade steel plate; by controlling the inlet temperature of the finish rolling, the generation of iron oxide scale can be reduced, the iron scale is prevented from being exploded, the final iron scale pressing-in defect is reduced, and the surface quality of the 980MPa-grade steel plate is improved.

The application discloses a preparation method of a medium-high carbon steel hot-rolled coil and the medium-high carbon steel. The preparation method of the medium-high carbon steel hot-rolled coil comprises the following steps: slab continuous casting: medium-high carbon steel liquid steel is cast and drawn to obtain a slab, and a pre-descaling treatment is performed on the slab to reduce oxides on the surface of the slab, thereby obtaining a pretreated slab; slab heating: the pretreated slab is subjected to a heating treatment, and after the heating treatment, a high-pressure water descaling treatment is performed, thereby obtaining a to-be-processed slab; rolling: the to-be-processed slab is rolled to obtain a strip steel. According to the embodiment of the application, the slab after the slab continuous casting is subjected to the pre-descaling treatment before the slab is heated in a furnace, and after the heating treatment, the high-pressure water descaling treatment is performed before rolling, thereby removing the initial thick iron oxide scale on the surface of the slab and ensuring that the uniformity of the iron oxide scale formed on the surface of the slab during hot rolling is good.

The invention discloses a rare earth doped iron oxyhydroxide / ferric oxide-three-dimensional graphene composite material and a preparation method thereof, the material is x% RE-FeOOH / Fe2O3 (at) 3D Gr, x is the molar ratio of rare earth ions to iron ions, the value range of x is 1-8.5, RE is one of rare earth elements Ce, La, Sm, Nd or Y, and RE is one of rare earth elements Fe, La, Sm, Nd or Y; the preparation method comprises the following steps: preparing a mixed solution A from an iron salt, a rare earth salt and an alkaline solution, adding a complexing agent into a graphene oxide solution to prepare a mixed solution B, performing ultrasonic treatment on the two solutions, mixing, adding a reducing agent, performing ultrasonic treatment again, and finally performing hydrothermal treatment, washing, freeze drying and low-temperature sintering. Rare earth ions can induce oxygen vacancies, increase active sites and promote ion transmission, the maximum mass specific capacitance of the material under 0.5 A / g reaches 1218.7 F / g, and the maximum capacitance retention rate of a flexible supercapacitor assembled by the material is 97% after 5000 times of charging and discharging.

A low heat, electrochemical cascade process generates iron metal (Fe2) from iron ore and a sequence of alkaline electrolytic solutions. An intermediate phase favors iron oxide in a layered double hydroxide (LDH) form resulting from conditioning silicates in the alkaline solution over chemically inert Fe3O4 formation. The alkaline electrolytic solution mitigates production of hydrogen gas over acidic approaches by inhibiting a hydrogen evolution reaction (HER) that forms parasitic hydrogen gas. An electrolyte containment generates an electrolyte flow for the cascading electrochemical reaction as the raw iron oxide transforms to iron metal while avoiding conventional shortcomings of low value products of Fe3O4 (magnetite) and hydrogen gas, and instead favors generation of iron metal. Additional electrolyte salts can further form iron alloys.

The invention discloses a treatment method of ferric hydroxide-based iron-manganese slag. The treatment method comprises the following steps: roasting the iron-manganese slag in a reducing atmosphere; carrying out wet magnetic separation on the roasted slag in a magnetic field to obtain iron powder and non-magnetic slag; carrying out oxidation impurity removal on the non-magnetic slag; carrying out manganese leaching on the non-magnetic slag subjected to oxidation impurity removal to obtain manganese carbonate and waste liquid; and recycling the waste liquid. According to the scheme provided by the invention, the iron-manganese slag is subjected to roasting, magnetic separation, oxidation impurity removal, manganese leaching, waste liquid recycling and the like, so that all-component high-value utilization of the iron-manganese slag is realized.

This disclosure relates to the field of titanium extraction technology from blast furnace slag, and particularly to a method for controlling the titanium carbide content using iron oxide powder, comprising the following steps: Step 1, when the slag generated by the carbon-blending of titanium-containing blast furnace slag reaches the smelting endpoint, a sample is taken to detect the mass percentage of titanium carbide in the slag; Step 2, when the mass percentage exceeds a set threshold, iron oxide powder is added to the slag to control the mass percentage within a reference range. This disclosure solves the problem of easy bending of titanium slabs with large aspect ratios during the upsetting process. This disclosure also solves the problem of high TiC content in existing titanium-containing blast furnace slag carbon-blending processes. By adding iron oxide powder to react with excess TiC in a directional manner, the TiC content can be stably controlled within a reference range, effectively reducing slag viscosity, ensuring smooth slag discharge, and avoiding safety hazards such as equipment blockage; at the same time, it improves the temperature control effect of the subsequent boiling chlorination reaction, and improves the efficiency and quality of subsequent titanium resource recovery.

A high-strength hot-dip galvanized steel sheet having a good surface appearance and suppressed generation of gray spot defects and black spot defects on a plating layer surface is manufactured using a steel to which B has been added as a base material steel sheet. In the annealing step prior to plating, the dew point in the temperature range of 300-500 DEG C is reduced to form a Fe reducing atmosphere, the generation of ammonia is suppressed by suppressing the generation of iron oxide, and the generation of ammonia and the nitridation of the steel sheet are suppressed by rapidly heating in a temperature range of 500 DEG C or higher in which the generation of ammonia becomes significant and nitrogen begins to permeate into the steel sheet. In addition, by shortening the annealing time in a temperature range of 750 DEG C or more and fixing a part of B as an oxide by causing the dew point to be-55 DEG C or more, the generation of nitride caused by diffusion of B into the surface of the steel sheet during annealing is suppressed. As a result, the generation of B nitride, which is the cause of the occurrence of gray-spot defects and black-spot defects, is suppressed.

The invention provides nitrogen-containing steel die casting covering slag and a preparation process thereof, and belongs to the technical field of covering slag. The invention relates to nitrogen-containing steel die casting covering slag which is prepared from the following components in parts by weight: 3 to 7 parts of iron oxide powder, 15 to 30 parts of wollastonite, 10 to 40 parts of flint clay, 8 to 18 parts of aluminum ash, 5 to 10 parts of silicon iron powder, 5 to 10 parts of quartz, 5 to 10 parts of lithium carbonate, 5 to 10 parts of sodium fluoride and 5 to 10 parts of laterite. The weight part of the silicon iron powder is 2-7 parts, the weight part of the quartz is 20-30 parts, the weight part of the lithium carbonate is 1-3 parts, the weight part of the sodium fluoride is 1-5 parts, and the weight part of the laterite is 10-25 parts. According to the nitrogen-containing steel die casting covering slag, through resource utilization of aluminum ash, the problem of nitrogen precipitation in the condensation process of a nitrogen-containing steel die casting ingot is solved, and the occurrence rate of subcutaneous pores and cracks of the nitrogen-containing steel die casting ingot is remarkably reduced.

The present application relates to a kind of local high-entropy oxide modified iron oxide electrocatalyst and its preparation method and application.The iron oxide electrocatalyst uses α-Fe2O3 Nanoparticle as matrix, and α-Fe2O3 Nanoparticle is embedded with high-entropy oxide phase composed of Fe, Co, Ni, Zn, Mn.Compared with prior art, the present application can retain the cost and reserves advantage of iron oxide material while realizing multi-dimensional precise regulation of catalyst lattice, electronic structure and reaction path through local high-entropy engineering, solve the core pain point of insufficient activity and stability of iron-based catalyst in pure water and natural seawater system, and realize high-performance application of iron-based catalyst in water electrolysis, natural seawater-based zinc-air battery and other scenarios.

The invention belongs to the technical field of preparation of magnetic materials, particularly relates to a preparation process of a manganese zinc ferrite magnetic ring, and provides the following scheme for solving the problem that the spraying preparation quality of the magnetic ring is influenced by non-spraying points of the magnetic ring caused by dead angles possibly appearing on an inner ring of the magnetic ring due to the fact that the magnetic ring is relatively thick during spraying. Comprising the following steps: weighing raw materials: preparing the raw materials required by the magnetic ring, proportioning the raw materials of ferric oxide, manganese oxide and zinc oxide powder according to the required proportion, and presintering the raw materials through a sintering furnace; the manganese zinc ferrite magnetic ring preparation process disclosed by the invention has the effect of improving the spraying preparation quality, during spraying, the device can split the spraying of the magnetic ring, so that the two sides of the magnetic ring are respectively sprayed, and during split spraying, due to the adoption of a two-side spraying mode, the spraying quality of the magnetic ring is improved. Therefore, the thickness of the magnetic ring needing to be covered by single-side spraying is reduced, the situation that dead corners appear on the inner ring due to the fact that the magnetic ring is too thick is avoided, and the using effect of the device is improved.

The utility model discloses a device for continuously producing Fe3C by adopting low-carbon-activity reducing gas, and relates to the field of a technology for greatly reducing emission of carbon dioxide in the iron and steel industry and high-grade steel production raw materials. The device comprises a reaction furnace body, a furnace body cover, an objective table and a gas introduction pipeline, the reaction furnace body is of a cylindrical tubular structure, the furnace body cover is arranged at the top end of the reaction furnace body, and the objective table is arranged at the lower end of the reaction furnace body; a feeding pipeline is inserted into a central hole of the furnace body cover, and a hole is formed beside the feeding pipeline for placing a thermocouple; micropores are uniformly distributed on the objective table, and the lower part of the objective table is communicated with the low-carbon activity reducing gas introduction pipeline. According to the structure disclosed by the utility model, Fe3C is stably produced by taking ferric oxide as a raw material and adopting low-carbon-activity reducing gas, so that the process is short, the energy consumption is low, and the innovation of a Fe3C production technology is realized.

The invention discloses steel for a high-strength precision welded pipe. The steel comprises the following components in percentage by mass: 0.08-0.15% of C, 0.1-0.3% of Si, 1.2-1.7% of Mn, 0.02-0.05% of Ti, 0.01-0.03% of Nb, less than or equal to 0.006% of S, less than or equal to 0.008% of N, less than or equal to 0.020% of P and the balance of Fe. And the balance of Fe and inevitable impurity elements. The C content and the manganese content meet the condition that C * Mn is greater than or equal to 0.13%; the titanium content and the niobium content meet the condition that Ti / Nb is greater than or equal to 1.5. On the basis of component improvement, high strength, high toughness and excellent processability can be achieved by further combining cooperative control of whole-process technological parameters such as heating, rolling, coiling and finishing, efficient stripping of oxide scales, fine grain strengthening and precise regulation and control of plate shapes are achieved, and the surface smoothness and thickness uniformity of steel are remarkably improved; the preparation process is effectively simplified, and the applicability is wide.

The invention relates to a preparation method for producing an economical steel plate through four-stage rolling. The preparation method comprises the steps that molten steel containing all elements is smelted in a vacuum furnace, and refining is completed; casting the smelted molten steel into a casting blank; the continuous casting billet is heated, the heating temperature ranges from 1200 DEG C to 1250 DEG C, the heating time ranges from 1 h to 3 h, and after heating, the continuous casting billet is discharged out of a furnace to remove oxide scale; the casting blank subjected to soaking is subjected to four-stage rolling to obtain a steel plate, the first-stage controlled rolling process is austenite recrystallization area large-deformation rolling, the second-stage controlled rolling process is austenite non-recrystallization area rolling, and the third-stage controlled rolling process is austenite critical area rolling; the fourth-stage controlled rolling process is austenite and ferrite two-phase region high-temperature small-deformation rolling; the steel plate obtained after four-stage rolling is cooled to 270-320 DEG C at the cooling speed of 15-20 DEG C / s, and then air cooling is conducted to the room temperature; the problems that in a conventional controlled rolling and controlled cooling process, although a heat treatment link can be omitted, it is difficult to synchronously optimize the strength and toughness and refine the structure under the low alloy cost are solved.

The invention discloses a low-temperature dephosphorization method for low-carbon aluminum killed steel based on full-process slagging and dynamic oxygen control, and belongs to the technical field of metallurgy. Molten iron pretreatment: molten iron is subjected to desulfurization and dephosphorization pretreatment; converter smelting is conducted, specifically, a top-bottom combined blowing converter is adopted, a staged gun position control system is executed, slag materials are added in batches, the final temperature range of the converter is controlled to be 1610-1630 DEG C, and the final phosphorus content is smaller than or equal to 0.010%; after converter tapping, part of terminal slag is reserved for next converter smelting, the content of iron oxide in the slag is diluted, and trickle operation is adopted during iron blending; refining and dynamic oxygen control: in the LF refining process, adding a deoxidizing agent in stages according to the oxygen determination value of the molten steel, and controlling the oxygen content of the refined molten steel to be less than 50ppm; and tapping and continuous casting: stopping slag by adopting a sliding plate in the tapping process, controlling the slag discharge amount, and carrying out continuous casting after soft argon blowing. According to the method, efficient dephosphorization can be realized, and rephosphorization can be effectively inhibited.

The application discloses a kind of nickel-iron layered double hydroxide / iron oxide composite material and preparation method thereof, main preparation steps are respectively configured ferric salt and triethanolamine solution;The complex solution of ferric ion and triethanolamine is obtained after triethanolamine solution is added dropwise into ferric salt solution, and then the solution is treated using microwave hydrothermal to obtain iron oxide precursor dispersion;After the mixed solution of nickel salt and triethanolamine is configured, it is added into iron oxide precursor dispersion and is mixed uniformly by ultrasonic treatment;The mixture is transferred to microwave hydrothermal reaction bottle, and then microwave hydrothermal treatment is carried out, after treatment is completed, precipitated product is washed by centrifugation using deionized water and ethanol, and finally vacuum drying obtains nickel-iron layered double hydroxide / iron oxide composite material.The nickel-iron layered double hydroxide / iron oxide composite material prepared by the microwave hydrothermal method of the application has simple preparation process and shows good electrochemical oxygen evolution activity.

This invention provides high-purity ferric citrate that is substantially free of β-iron hydroxide. [Solution] A high-purity ferric citrate that substantially does not contain β-iron hydroxide, and in which the β-iron hydroxide content is less than 6% by weight relative to its total weight. Preferably, high-purity ferric citrate having a β-iron hydroxide content of less than 2.5% by weight. More preferably, high-purity citric acid II having a β-iron oxide content of less than 1.0% by weight. iron.

The invention provides a dephosphorization treatment method of a converter, which comprises the following steps: if the phosphorus content standard exceeding value of the converter end point molten steel is less than or equal to 0.005%, the end point temperature is greater than or equal to 1640 DEG C, and the end point carbon content is less than or equal to 0.07%, obtaining aluminum killed steel large ladle casting residual molten steel and attached refining slag, and pouring into a steel ladle to obtain refined hot slag; pouring out terminal slag in the converter according to a preset slag pouring amount; the refined hot-state slag is poured into the converter, and after the converter returns to the zero position, furnace slag in the converter is purged through a nitrogen purging gun; and after a first preset time, adjusting the bottom blowing mode of the converter into a strong stirring mode, and after standing for a second preset time, carrying out a tapping process, so as to solve the problems that steel consumption is increased, furnace lining erosion is aggravated, the alloy yield is reduced, the production cost is reduced and the like due to the fact that the oxygen content in molten steel and the iron oxide content in slag are obviously increased in a current converter dephosphorization treatment method. And the quality of the molten steel is influenced by the peroxidation of the molten steel.