464 results about "Pig iron" patented technology

The invention relates to the field of chemical engineering and steel smelting, and discloses a method for extracting vanadium by top-blowing nitrogen-oxygen mixed gas, which comprises the following steps: S1, measuring the temperature of overline-crossing molten iron, sampling, and testing and analyzing the components of the molten iron; s2, measuring the temperature of the molten iron mixed into the converter; s3, according to the temperature measurement result in the S1 and the temperature measurement result in the S2, the charging temperature is corrected; s4, according to the corrected charging temperature, the proportion of the mixed gas is adjusted in a staged mode for blowing; s5, adding a coolant and pig iron into the furnace according to an analysis result in S1; and S6, after blowing is completed, slag and steel are separated, and vanadium slag and low-residue vanadium semisteel are obtained. According to the scheme, in order to solve the problems that in an existing vanadium extraction process, the temperature of a molten pool rises too fast, the stirring effect is insufficient, and the vanadium oxidation rate is limited, the recovery rate of vanadium is increased and the content of residual vanadium in semi-steel is reduced by accurately controlling the nitrogen-oxygen mixed blowing proportion, reasonably distributing the blowing time and combining heat balance calculation and end point control; and meanwhile, molten steel quality and subsequent steelmaking process requirements are guaranteed.

The invention belongs to the field of metal materials, and provides a hard alloy wear-resistant steel ball suitable for mine ore grinding and a preparation method thereof.The hard alloy wear-resistant steel ball is prepared from waste steel pig iron as a basic raw material and chemical components including 2.1%-2.2% of C, 9.8%-10.0% of Cr, 0.10%-0.20% of V and 0.03%-0.06% of Ti; a core-shell precipitated phase microstructure design with MN / MCN as a hard core and chromium carbonitride as a gradient self-passivation shell layer is formed through medium-frequency induction furnace smelting, controlled nitrogen introduction establishment of a V-Ti-C-N microalloy system, bottom pouring solidification and austenitizing quenching and tempering heat treatment processes, and the performance indexes that the surface hardness is HRC60-63 and the core hardness is HRC54-58 are achieved; the average particle size of a core-shell precipitated phase is in dispersed distribution of 20-200nm, the shell thickness is 5-50nm, and the alloy steel ball has excellent wear resistance and corrosion resistance under the high-impact and high-wear working conditions of wet ore grinding, solves the problem of insufficient wear resistance and corrosion resistance of a traditional alloy steel ball, and has wide mine ore grinding application value.

A high scrap steel ratio steelmaking nitrogen control integration technology is characterized by comprising the steps that pig iron and coke are added into a converter and molten iron, and the bottom blowing strength of the converter is improved; converter sealing and argon protection optimization are carried out, and then silicon iron heating and waste steel treatment are carried out before blowing; the first blowing hit rate is optimized, tapping and deoxidation are controlled, and the nitrogen content of the optimized alloy is detected; transferring into a refining furnace, and adjusting the power transmission heating time and the deoxidation and alloying time; optimizing a low-slag-quantity and low-temperature-period power transmission mode, and controlling the argon flow of the refining furnace; and optimizing slagging at the early stage of refining, controlling a silicon-manganese composite deoxidation and slag system, and controlling argon flow during soft blowing of the refining furnace. According to the technology, the nitrogen removal amount of the converter under the low molten iron unit consumption condition is improved mainly through carbon content supplementation, waste steel size optimization and exothermic agent heat supplementation, and the nitrogen increase of the refining furnace is reduced. According to the integrated nitrogen control process technology, the nitrogen content can be effectively reduced, the investment and application of vacuum degassing equipment are reduced, the process is simplified, and the production cost is reduced.

The invention relates to the technical field of steelmaking, in particular to a steelmaking process based on a Q420 slab, which comprises the following steps: molten iron, scrap steel and pig iron are put into a converter for melting to obtain molten steel, and the molten steel is smelted in the converter and then transferred into a ladle refining furnace for refining; acquiring a fluctuation period to determine whether the removal efficiency of the inclusions in the molten steel is qualified or not; determining the nodulation condition of the slag layer based on the judgment result that the removal efficiency of the inclusions is unqualified so as to determine that the viscosity of the whole slag layer is unqualified or the viscosity of the local slag layer is unqualified; the addition amount of fluorite is determined based on the judgment result that the viscosity of the overall slag layer is unqualified, or the pulse frequency of argon or the refining duration of molten steel is adjusted based on the judgment result that the viscosity of the local slag layer is unqualified; and the refined molten steel is subjected to vacuum degassing treatment and then subjected to continuous casting to obtain a slab, and after the slab is subjected to flaw detection, defect characterization parameters are determined so as to adjust the attenuation rate threshold value. The purification degree of the molten steel is improved.

The invention provides a nodular cast iron material and a preparation method and application thereof. The preparation method of the nodular cast iron material comprises the following steps that S1, a mixture of pig iron, low-manganese waste steel and foundry returns is heated to be completely molten, alloy and auxiliary materials are supplemented and adjusted to target components, and base iron is obtained; s2, a spheroidizing agent is added into the base iron to conduct spheroidizing treatment, ladle-to-ladle inoculation is conducted after spheroidizing treatment, and an efficient inoculant is added during ladle-to-ladle inoculation; s3, pouring is conducted, and during pouring, a long-acting stream inoculant is added for instantaneous inoculation; and S4, carrying out vibration aging treatment to obtain the nodular cast iron material. According to the nodular cast iron material, collaborative upgrading is achieved in the three dimensions of graphite form-matrix strength-thermal stress dissipation, in a bench test, the number of hot cracks is greatly increased, the service life is obviously prolonged, and reliable guarantee is provided for braking safety of heavy vehicles.

The invention relates to the field of metal material casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT800-5, which comprises the following steps: preparing pig iron, waste steel and foundry returns, and using auxiliary materials such as a silicon carbide pretreating agent, a high-temperature graphitization carburant, a rare earth magnesium silicon iron nodulizing agent, a silicon barium nucleating agent and a silicon strontium nucleating agent to prepare the green sand as-cast high-plasticity nodular cast iron QT800-5. The purity and component stability of molten iron are ensured; in the smelting process, purification and adjustment are carried out through temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microscopic structure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation; the final casting has excellent mechanical properties including the tensile strength larger than or equal to 800 MPa, the yield strength larger than or equal to 480 MPa, the elongation larger than or equal to 5% and the matrix pearlite content larger than or equal to 80%. The production process disclosed by the invention is simplified, is suitable for large-scale industrial production, and has a wide application prospect in lightweight application requiring high-strength and high-plasticity materials.

A blast furnace operation method according to one aspect of the present disclosure comprises: a parameter estimation step for estimating blast parameters and a pulverized coal ratio in a second operation, such that the amount molten iron produced, the molten iron temperature, and the furnace top gas temperature in the second operation match those in a reference operation; a change information acquisition step for acquiring information on a temporal change in one or both of the molten iron temperature and the amount of molten iron produced when performing the second operation based on the blast parameters and the pulverized coal ratio estimated in the parameter estimation step with a delay of a predetermined time after switching from the reference operation to the first operation; a repeating step for performing the change information acquisition step a plurality of times while changing the predetermined time; and an optimum delay time acquisition step for determining, as an optimum delay time, a predetermined time such that the temporal change in the molten iron temperature or the amount of molten iron produced is the smallest, on the basis of the information acquired in the repeating step. After switching from the reference operation to the first operation, the second operation based on the blast parameters and the pulverized coal ratio estimated in the parameter estimation step is started with a delay of the optimum delay time.

The invention relates to a method for optimizing a pig iron desulfurization process (1), wherein the pig iron desulfurization process (1) is carried out by dispensing one or more desulfurization agents (2, 3, 4) into a pig iron ladle (5) or a torpedo car, wherein a plurality of treatment patterns are available which differ with respect to the type of desulfurization agents (2, 3, 4) dispensed. The optimization is based on creating a separate model (8) for each of the plurality of treatment patterns in order to optimize the added amounts of the desulfurization agents (2, 3, 4) for the associated treatment pattern, and training (9) the created separate models (8) for each of the plurality of treatment patterns after a predefined number of performed pig iron desulfurization processes (1) with the corresponding treatment pattern. Future pig iron desulfurization processes (1) are optimized on the basis of the predictions of the separate models (8), wherein the optimization determines a treatment pattern and the added amounts of the desulfurization agents (2, 3, 4) for the treatment pattern by means of a comparison of the predictions of the separate models (8). The invention also relates to a system and a computer program which are designed to carry out the method according to the invention.

The invention discloses automatic bed frame metal material recycling processing equipment which comprises a metal material compression processing device, a smashing device and a smelting reduction device, the metal material compression processing device comprises a compression forming bin, and a discharging opening is formed in the compression forming bin; a transverse compression assembly used for transversely compressing metal materials in the direction of the discharging opening is arranged in the compression forming bin, side compression and upper compression are arranged, waste is preliminarily compressed at the same time, the overall compression efficiency is improved, automatic opening is achieved in the discharging process, and the waste is discharged conveniently. A position guide assembly is arranged and can control the moving positions of the transverse compression assembly, the vertical compression assembly and the lifting baffle assembly in different time periods, and a series of work such as compression, opening of a discharging opening, metal pushing and closing of the discharging opening is achieved; the efficiency of pig iron reduction is greatly improved, and the recycling efficiency of waste metal of the bedstead is improved.

The invention belongs to the technical field of blast furnace slag resource utilization, and discloses a method for preparing nano calcium carbonate by blast furnace slag resource utilization, which comprises the following steps: carrying out chemical extraction treatment on blast furnace slag to obtain an extraction solution rich in calcium ions; wherein the blast furnace slag is blast furnace slag generated during pig iron smelting; introducing carbon dioxide into the leach liquor rich in calcium ions for reaction, and performing screening, washing and drying treatment after the reaction to obtain nano calcium carbonate; wherein the carbon dioxide is carbon dioxide gas captured by organic amine in the blast furnace gas purification process; wherein the carbon dioxide is carbon dioxide gas captured by organic amine in the blast furnace gas purification process; according to the method, the factory blast furnace slag is fully utilized, the prepared nano calcium carbonate has the advantages of high purity, high particle size concentration ratio and high product added value, and the method is high in process operability, easy to industrialize and low in cost.

The invention discloses nodular cast iron and a production process, and relates to the technical field of nodular cast iron preparation. The invention discloses a nodular cast iron production process. Carbon steel scrap and recirculated iron are used as main furnace materials for smelting, a spheroidizing agent and a first nucleating agent are added for a spheroidizing reaction, pouring is conducted, stream secondary inoculation is conducted, solidification cooling and heat treatment are conducted, and a casting is formed. The process route of the nodular cast iron production process is different from that of a foreign high-silicon solid solution strengthening process route for improving the elongation rate, pig iron is not adopted, only waste steel and recirculated iron are used as main raw materials, and the prepared nodular cast iron meets the requirements of casting products for high strength and high elongation rate of nodular cast iron at the same time; and no precious alloy is added in the production process, so that the production cost is greatly reduced, and the economic benefit is remarkably improved.

The invention relates to the field of casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT450-18, which comprises the following steps of: preparing pig iron, waste steel and foundry returns according to a certain proportion, and preparing the green sand as-cast high-plasticity nodular cast iron QT450-18 by using auxiliary materials such as a silicon carbide pretreatment agent, a high-temperature graphitization carburant, a rare-earth magnesium silicon iron nodulizer, a silicon barium inoculant and a silicon strontium inoculant. And purity and component stability of molten iron are ensured. In the smelting process, purification and adjustment are carried out through accurate temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microstructure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation. The final casting has excellent mechanical properties, including tensile strength greater than or equal to 440 MPa, yield strength greater than or equal to 300 MPa, elongation greater than or equal to 16%, and V-shaped notch normal temperature impact absorption energy greater than or equal to 8 J. The method is simple and convenient to operate, high in production efficiency and suitable for large-scale industrial production.

The invention belongs to the field of blast furnace ironmaking, and particularly relates to an iron ore blending method for blast furnace smelting of high-titanium schreyerite, which comprises the following processes: (1) establishing an ore blending model for blast furnace smelting of high-titanium schreyerite; (2) determining the chemical components of the sintered ore and the fuel consumption in the sintering process; (3) calculating the schreyerite proportion; (4) calculating the charging grade; and (5) calculating the pig iron cost. The method not only can stably control the slag components and the slag-iron ratio, but also can obtain the cost of ton iron, thereby providing reference for reasonable ore blending of enterprises.

To determine whether a furnace condition is unstable or not.SOLUTION: In a method for determining a furnace condition of a blast furnace, a calculated tapping amount of a blast furnace is calculated in a predetermined cycle, and each time the calculated tapping amount is calculated, a coefficient of variation of the calculated tapping amount is calculated based on a plurality of calculated tapping amounts calculated in a predetermined period up to the present. When the increase in the coefficient of variation per unit time is equal to or greater than a predetermined threshold value, it is determined that the furnace condition is unstable. The threshold value may be N times (N is a positive integer) the standard deviation of the increase amount within the predetermined period, where the integer N may be 2.SELECTED DRAWING: Figure 2

The invention discloses a method for smelting heat-resistant steel 0Cr25Ni20 through low-cost iron and P removal, and the method comprises the steps of material preparation, P and Fe removal treatment, material distribution, AOD (argon oxygen decarburization) refining, LF (ladle furnace) refining and continuous casting, and the chemical components of the heat-resistant steel 0Cr25Ni20 are controlled in percentage by mass: less than or equal to 0.080% of C; si < = 1.00%; mn < = 2.00%; p is less than or equal to 0.04%; s is less than or equal to 0.02%; ni: 19%-22%; according to the invention, a material separation form is adopted, heat-resistant steel for continuous casting of two furnaces can be produced at the same time, the process flow is convenient, the AOD smelting time is shorter, and the quantity production is guaranteed. The low control of p is realized, high manganese is used for replacing a manganese-iron alloy material, the production cost is reduced, the low-p molten nickel iron is smelted by removing iron and p from high-p pig iron, and the use of pure nickel is reduced. And common high-carbon ferrochrome is adopted, so that the use of imported ferrochrome is reduced. Meanwhile, the chromium melting water in the intermediate frequency furnace reduces oxidation of chromium and improves the recovery rate of chromium. Iron and p are removed at low cost, and iron-removed slag is recycled, so that the production cost is reduced while the production efficiency is improved.

The invention belongs to the technical field of anaerobic ammonia oxidation materials, and particularly relates to an anaerobic ammonia oxidation biofilm carrier as well as a preparation method and application thereof. The method comprises the following steps: applying an iron raw material to an activated carbon material to obtain a composite raw material, and soaking the composite raw material in an incineration landfill leachate aerobic tank to obtain an intermediate carrier product; the intermediate carrier product is soaked in an incineration landfill leachate anaerobic ammonia oxidation pond, and the anaerobic ammonia oxidation biofilm carrier is obtained. The preparation method provided by the invention has the advantages of no need of high-temperature firing, mild reaction conditions and low cost. Waste pig iron products are adopted as iron raw materials, and waste iron resource utilization can be achieved. Meanwhile, reaction is carried out in the incineration landfill leachate aerobic tank and the incineration landfill leachate anaerobic ammonia oxidation tank, iron ions are attached to activated carbon through the corrosion effect of the incineration landfill leachate, treatment of the incineration landfill leachate is completed while the anaerobic ammonia oxidation biofilm carrier is prepared, and the method is environmentally friendly, low in carbon and free of secondary pollution.

The invention provides a smelting method of vanadium-titanium-iron minerals, which comprises the following steps: carrying out reduction roasting on the vanadium-titanium-iron minerals by using a reducing agent to obtain a metallized material; and the metallized material and a slag former are smelted, the slag former comprises sodium salt, and vanadium-containing pig iron and active titanium slag are obtained after smelting is finished. According to the smelting method provided by the invention, a two-step smelting process of pre-reduction and sodium modification smelting is adopted for the vanadium-titanium-iron minerals, so that efficient separation of titanium and iron vanadium is realized, and vanadium-containing pig iron and titanium slag with high additional values are obtained. The titanium slag is high in grade, good in activity and high in acidolysis rate, and the problems that ferrovanadium and the titanium slag are difficult to separate in the vanadium-titanium-iron mineral smelting process, and the titanium slag is poor in activity, low in acidolysis rate and incapable of being economically utilized are solved.

A production method of pig iron using a blast furnace with a tuyere includes: charging a first layer containing an iron ore material and a second layer containing coke alternately in the blast furnace; and reducing and melting the iron ore material in the charged first layer while injecting an auxiliary reductant into the blast furnace by hot air blown from the tuyere, in which: an aggregate for letting through the hot air to a central portion of the blast furnace is blended into the first layer; and the aggregate contains a reduced iron molded product obtained through compression molding of reduced iron.

The invention discloses a ladle slag line repairing material which comprises the following components in percentage by mass: 60-85% of magnesia, 5-15% of used magnesia carbon brick powder, 2-11% of iron phosphorus powder, 0.3-2% of metal aluminum powder, 2-6% of superfine graphite powder, 2-8% of pig iron particles, 1-10% of kaolin fine powder and 1-5% of spherical SiO2 micro powder. And 2-20% of additional waste engine oil, 0-16% of aluminum dihydrogen phosphate and 0.2-0.6% of amine-terminated polyisobutene are further included. The steel ladle slag line repairing material has good high temperature resistance and adhesion performance, the adhesion effect on a steel ladle slag line can be effectively improved, the service life of the steel ladle slag line can be prolonged, and the steel ladle slag line repairing material is wide in applicability; and the related preparation method is relatively simple and relatively short in period, can realize resource utilization of various solid and liquid wastes, and has remarkable economic and environmental benefits.

The invention provides a production method of high-strength nodular cast iron and belongs to the technical field of metal material processing. Comprising the following steps: proportioning: proportioning the following raw materials in percentage by weight: 60-70% of pig iron, 20-30% of foundry returns and 10-15% of waste steel; pig iron is added to the bottom of the furnace, foundry returns are added, and finally waste steel is added; after the molten iron is uniformly molten, heating to 1420-1440 DEG C, and sampling to analyze chemical components; inoculation and nitrogen increasing treatment: spheroidizing by adopting a pouring method, sequentially adding pure antimony, a rare earth magnesium spheroidizing agent and a mixture of ferromanganese nitride and a ferrosilicon inoculant, adding the rest of molten iron and the inoculant in stages, and adding an antimony-containing inoculant during pouring; and after pouring is completed, the box is opened for cooling when the temperature of the casting is reduced to 800-900 DEG C. According to the method, the nitrogen increasing process is matched with microalloying, the problems of high alloy adding amount and high cost in the prior art are solved, the alloy using amount can be remarkably reduced, and meanwhile the mechanical property of cast iron is guaranteed.

The utility model provides a steel-making engineering feeding device, relates to the technical field of steel-making engineering feeding, and aims to solve the problems that in the prior art, manual dumping is mostly performed in the dumping process, but the dumping time is short, the dumping time is short, the dumping efficiency is high, and the like. The problems that pig iron in a hopper is prone to remaining due to the fact that the hopper is inclined and limited by the inclination angle, and then the progress of a steelmaking project is affected are solved. And the hopper arranged at one end of the connecting rod can perform reciprocating swing operation along with contraction and resetting of the adjusting assembly, so that materials in the hopper can be more conveniently shaken off, and the purpose of higher practicability is achieved.

The invention relates to a thick and large-section nodular cast iron inoculation method based on a laminated slow-release inoculation block. The method comprises the following treatment steps that S1, raw materials are prepared; s2, the high-purity pig iron, the waste steel and the nodular cast iron foundry returns in the step S1 are put into an electric induction furnace to be smelted; s3, performing carbon and silicon testing on the molten iron subjected to slag removal in the step S2 by using a carbon and silicon analyzer, and adjusting components; s4, carrying out primary spheroidizing inoculation by adopting a pouring method; and S5, after spheroidizing inoculation is completed, molten iron is poured into a sand mold, a laminated slow-release inoculation block is placed in the sand mold for slow-release inoculation, and a thick and large-section spheroidal graphite cast iron casting is formed. The method has the advantages that slow-release inoculation is implemented in the cross gate, and molten iron continuously and slowly releases an inoculant in the pouring process through the laminated slow-release inoculation blocks. By means of the method, inoculation recession can be effectively inhibited, the graphite form is improved, and finally the density and the spheroidization rate of graphite nodules in the center of the thick and large-section nodular iron casting are increased.

The invention discloses sand mixing equipment for pig iron casting reclaimed sand, and relates to the technical field of sand mixing equipment for pig iron casting reclaimed sand. Comprising a middle block, the middle block is fixedly connected with the outer side of a rotating shaft, the outer side of the rotating shaft is fixedly connected with two connecting pieces, the two connecting pieces are symmetrically arranged with the middle block as the center, the outer sides of the connecting pieces are slidably connected with round rods, the outer sides of the round rods are rotatably connected with fixing plates, and the fixing plates are arranged in a fan shape; a plurality of round holes are formed in the outer sides of the fixing plates, and the fixing plates are evenly distributed with the connecting piece as the center. According to the pig iron casting reclaimed sand mixing equipment, the fixing plates are designed to be fan-shaped, so that the fixing plates can cover a larger area during rotation, the stirring efficiency is improved, mixed reclaimed sand and a binder can be dispersed more uniformly, sand mixing dead angles are reduced, and the sand mixing quality is improved; and meanwhile, the round holes can enable the materials to form a more complex flowing path in the stirring process.

The invention discloses a two-stage spheroidizing process and processing equipment for a high-nickel austenite ductile iron valve rod nut, and belongs to the technical field of metal smelting, the two-stage spheroidizing process comprises the following steps: S1, preparing raw materials: low-sulfur and low-phosphorus pig iron, scrap steel, ferronickel, a silicon-magnesium-calcium spheroidizing agent and a 75 silicon-iron nucleating agent; the smelting furnace is started, and the low-sulfur and low-phosphorus pig iron, the waste steel and the ferronickel furnace charge are heated to be completely molten; s2, primary spheroidizing: after covering a nucleating agent, rapidly pouring high-temperature molten iron to initiate spheroidizing reaction and promote spheroidizing of graphite; the slagging-off mechanism is convenient and flexible to move, convenient to adapt to different smelting furnaces and casting ladles, convenient to use and capable of rapidly removing dross and rapidly cleaning slag charge, the slagging-off quality is improved, the slagging-off hopper and the striker plate are flexible and rapid to disassemble and assemble and convenient to replace, and the slagging-off efficiency is improved. And then smelting furnaces and molten iron casting ladles with different calibers can be conveniently adapted, so that the technical effect that the slagging-off working efficiency is effectively improved is achieved.

The invention provides high-phosphorus wear-resistant gray cast iron and a production method thereof, and belongs to the technical field of high-phosphorus wear-resistant gray cast irons.The production method comprises the following steps that raw materials are inspected; smelting is conducted, specifically, waste steel, gray iron foundry returns, pig iron, a carburant and ferrophosphorus are sequentially put into an electric furnace to be melted; nickel, chromium and copper are sequentially added into the electric furnace, and the molten iron is quenched and tempered, so that the final components of the molten iron meet the requirements; molding: preparing a casting mold; a casting ladle is preheated, meanwhile, an inoculant is placed at the bottom of the casting ladle, then molten iron is poured into the casting ladle, and the inoculant is added along with flow in the process that the casting ladle conducts casting into the mold; box opening: the box is opened after the temperature is reduced, and the formed high-phosphorus wear-resistant gray cast iron is obtained; and performing heat treatment: performing high-temperature annealing on the high-phosphorus wear-resistant gray cast iron, and inspecting the casting to obtain a final finished product. According to the technical scheme, the purpose of improving the abrasion resistance and the mechanical performance of the gray cast iron is achieved.

The invention relates to the technical field of titanium-cobalt alloy processing technologies and equipment, in particular to a preparation technology and equipment of a titanium-cobalt alloy TiC-9ALC-5USCBN. The preparation technology comprises the steps that S1, alloy metal and pig iron powder are prepared; the alloy metal and the pig iron powder are subjected to rough filtration, and impurities are removed; s2, weighing the raw materials according to the formula ratio; s4, pig iron powder is added into a smelting furnace to be smelted, S5, molten iron in the molten state in the step S4 is subjected to desulfurization and deoxidation treatment, S6, alloy metal is added into a crucible to be smelted for the first time, and after complete melting, air cooling is conducted to obtain an intermediate alloy material B, and S7, the intermediate alloy material B is added into the molten iron obtained in the step S5, and the product A is obtained. Meanwhile, the 1450 DEG C brittleness and the high heat conductivity coefficient of ferrite stainless steel are kept, the characteristics of superplasticity, dry burning resistance, abrasion resistance and the like are achieved, the service life of products is greatly prolonged, the service cycle of manufacturers is prolonged, the overhaul frequency is reduced, the maintenance cost of enterprises is reduced, and the economic benefits of the enterprises are increased.

The present invention discloses a method for deep dephosphorization of a chromium-nickel pig iron melt in an electric furnace, comprising: charging the chromium-nickel pig iron into an electric furnace and melting it into a chromium-nickel pig iron pre-melt; after the electric furnace is smelted clean, desiliconizing and dechromizing, adding a solid dephosphorizing agent, supplying oxygen through a furnace door oxygen lance, and adding lime to form slag; after stopping desiliconization and dechromization, skimming the slag and conducting electric furnace deep dephosphorization, adding a solid dephosphorizing agent, continuing to supply oxygen through the furnace door oxygen lance, spraying a powdered dephosphorizing agent through the electric furnace carbon powder lance, and adding lime to form slag; after completing the electric furnace deep dephosphorization, switching the furnace door oxygen lance to nitrogen for strong stirring. The present invention solves the technical problem of high cost caused by the difficulty of electric furnace dephosphorization of the chromium-nickel pig iron melt, which results in the need to use dephosphorized molten iron + pure nickel in stainless steel smelting. The present invention achieves the purpose of using cheap chromium-nickel pig iron as a raw material to prepare a low-phosphorus, high-nickel stainless steel mother liquor through electric furnace deep dephosphorization, and then producing a low-phosphorus special stainless steel variety by adding high-carbon ferrochrome to the low-phosphorus, high-nickel stainless steel mother liquor, thereby simplifying the production process and reducing smelting costs.

To provide a slag discharging apparatus and a slag discharging method that allow acquisition of a removal amount of slag independently of slag properties.SOLUTION: A slag discharging apparatus (1) specifies a position of a scraping plate (21) as a first region from a first captured image in which a molten pig iron surface (70) in a container (11) is imaged, identifies a second region having brightness equal to or greater than a predetermined first threshold on a movement direction side of the scraping plate (21) from the first region, and calculates a removal amount of slag to be removed, based on an area of the second region.SELECTED DRAWING: Figure 1

The invention relates to the technical field of solid waste harmless and recycling equipment, in particular to a gradient temperature pyrolysis-melting vitrification integrated treatment device and process for red mud. According to the device, an electromagnetic heating rotary kiln pyrolysis section and an electrode melting section are directly coupled with a material transfer device through high-temperature atmosphere isolation. The process comprises the following steps: granulating red mud, a reducing agent and a flux, feeding into a rotary kiln of which the temperature is accurately controlled by multiple groups of electromagnetic induction coils in a partitioned manner, and sequentially completing dehydration, selective reduction and iron particle polymerization to produce gt; high-temperature pyrolysis slag at 1000 DEG C; the pyrolysis slag directly falls into an electric melting pool to complete melting and iron-slag liquid phase separation under absolute isolation of reducing atmosphere and oxidizing atmosphere by the device, and pig iron and a stable glass body are respectively obtained. Through the design of'hot slag direct melting 'and'energy closed loop', the problems of high energy consumption and complex flow of the traditional process are solved, and efficient recovery of iron resources in the red mud and thorough harmless and high-valued utilization of the residues are realized.

The invention provides a preparation method of a high-wear-resistance alloy lining plate, and relates to the technical field of wear-resistance alloys, carbon steel and pig iron are mixed, heated and melted, high-carbon ferromanganese, medium-carbon ferrochrome and ferrosilicon are added, heating refining is carried out, aluminum powder is added, the mixture is put into a mold, cooling and demolding are carried out, heating homogenization, quenching and cooling are carried out, and a mother plate is prepared; mixing bismaleimide, the composite powder and sepiolite fibers, heating and stirring, coating a mother board with the mixture, firstly applying negative pressure, then applying positive pressure, heating and cooling to obtain a substrate layer; and placing the mother board in magnetron sputtering equipment, sputtering on the substrate layer to obtain a chromium nitride functional layer, and cooling to obtain the high-wear-resistance alloy lining board. The composite powder is prepared by mixing and heating chromium carbide powder and a hydrogen peroxide solution, filtering, mixing with an ethanol solution and gamma-aminopropyltriethoxysilane, heating, condensing and refluxing, washing and drying, and mixing and heating with amine-terminated polyether and N, N-dimethylformamide. The wear-resistant stability of the alloy lining plate can be improved.