358 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.

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.

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 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.

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 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 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 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.

The invention discloses high-strength wear-resistant wind power ductile iron and a processing technology thereof, and belongs to the technical field of casting. The processing technology of the high-strength wear-resistant wind power ductile iron comprises the following steps: A1, sequentially adding waste steel, a carburant, pig iron, foundry returns and ferroniobium into an intermediate frequency furnace, standing after all furnace charges are molten, and removing slag; a2, a spheroidizing agent, a nucleating agent, metal antimony, titanium carbide and a covering agent are sequentially added to the bottom of a steel ladle, and then molten iron in the step A1 is poured into the steel ladle for spheroidizing and inoculation; a3, the molten iron obtained after spheroidizing and inoculation is subjected to slagging-off and then poured into a casting mold, and a stream inoculant is added in the pouring process; a4, after pouring is finished, slowly cooling in the sand mold to below 400 DEG C, and removing a casting from the casting mold; and A5, the casting is subjected to pulse current quenching treatment and then subjected to pulse current normalizing treatment, and the high-strength wear-resistant wind power ductile iron is obtained. The prepared high-strength wear-resistant wind power ductile iron is high in strength and good in wear resistance, and the low-temperature impact performance meets the requirement of QT500-14AL.

The invention relates to a method for measuring and analyzing nickel, silicon and phosphorus in nickel-containing pig iron, in particular to the technical field of detection and analys.The measuring and analyzing method comprises the steps that a nickel-containing pig iron sample is drilled, sampled and separated through a hard alloy drill bit, and a test sample is obtained; sequentially carrying out acid dissolution, solid-liquid separation and constant volume on the obtained test sample to obtain a test solution; measuring the contents of nickel, silicon and phosphorus in the obtained test solution by adopting a full-spectrum direct-reading inductively coupled plasma emission spectrum; a standard curve used in the full-spectrum direct-reading inductively coupled plasma emission spectrum measurement is obtained by dissolving a gradient nickel-containing pig iron standard sample to a constant volume. According to the determination and analysis method provided by the invention, the detection process is designed, so that the nickel, silicon and phosphorus elements in the nickel-containing pig iron with the nickel content of 8-15% can be jointly determined, and a scientific data basis is provided for production management and control.

The regenerated pig iron screening device comprises a grading screening machine box, a pretreatment box and a coarse screening assembly, a feeding mechanism is installed on the top of the side face of the grading screening machine box, and the pretreatment box is placed on the side face, close to the feeding mechanism, of the grading screening machine box and located below the feeding mechanism. The coarse screening assembly is arranged in an inner cavity of the top of the pretreatment box, an inclined guide plate is arranged below the coarse screening assembly, the outer surface of the inclined guide plate and the inner surface of the bottom of the pretreatment box are fixedly installed, a collecting box is fixedly installed on the side face, away from the feeding sleeve and the discharging sleeve, of the pretreatment box, and a vertical spiral feeding machine is fixedly installed on the side face of the collecting box. The raw materials are pretreated through the coarse screening assembly, the feeding granularity range of the raw materials entering the grading screening machine box to be screened is adjusted to a certain degree, the follow-up refining effect and efficiency are improved, and the interference problem of large-particle raw materials on small-particle raw materials is solved.

The present invention relates to a method for producing hot metal in an electric smelting furnace 13, comprising the following consecutive steps: - providing a direct reduced iron product 12, - providing a carbon and iron-containing material 30, - alternately feeding the DRI product 12 and the carbon and iron-containing material 30 to at least a part of the smelting furnace, - melting the DRI product 12 and the carbon and iron-containing material 30 to produce hot metal 14. The present invention also relates to the production of steel from said hot metal.

The invention relates to the technical field of nodular cast iron, in particular to a preparation method of high-strength and high-toughness nodular cast iron, which comprises the following steps: weighing the following basic raw materials in percentage by mass: 48-52% of pig iron, 28-32% of scrap steel, 18-22% of foundry returns, 0.002-0.008% of antimony and 0.015-0.025% of copper, smelting, transferring into a nodulizing bag, and adding an Mg-Ce-Y composite nodulizing agent and an inoculant for inoculation; and after inoculation is completed, casting is conducted, and a casting is fed into a resistance furnace to be subjected to normalizing, quenching and tempering treatment. The mechanical property combination that the tensile strength is larger than or equal to 800 MPa and the ductility is larger than or equal to 10% is achieved.

The invention relates to the technical field of metal product preparation, and discloses a manufacturing process of a high-strength wear-resistant alloy cast iron pan, which comprises the following steps: respectively carrying out magnetic separation impurity removal on a basic raw material and titanium powder, then carrying out vacuum roasting, cooling and discharging to respectively obtain pre-treated pig iron, pre-treated carbon steel and pre-treated titanium powder; preheating an induction furnace, adding the pretreated pig iron, and raising the furnace temperature until the pretreated pig iron is completely molten; then adding the pretreated carbon steel and the reinforced alloy, starting electromagnetic stirring, then adding the pretreated titanium powder, and continuously stirring after adding to obtain a melt; a composite inoculant is added into the melt and stirred, then molten iron is poured into a heat preservation launder for pouring, demolding is conducted after heat preservation, and a pot blank is obtained; the pot bottom and the pot body of the pot blank are subjected to partitioned cooling, then overall cooling and vibration aging treatment are conducted, and then natural cooling is conducted to the room temperature; and after the cooled pan blank is ground and polished, the pan blank is coated with a composite ceramic coating, and the high-strength wear-resistant alloy cast iron pan is obtained.

The present application belongs to the technical field of aluminum electrolysis production, and provides a phosphorus pig iron recarburization and desulfurization additive and a production process. The additive raw material comprises graphite powder, passivated magnesium, calcium oxide, silicon iron powder, manganese iron powder, phosphorus iron powder, sodium carbonate and a binder. The additive has a four-layer structure, the passivated magnesium is wrapped inside the calcium oxide, and the graphite powder wraps the calcium oxide inside. When used, the graphite powder dissolves in the phosphorus pig iron water, the calcium oxide is gradually released to perform preliminary desulfurization, and after the calcium oxide reaction is completed, the passivated magnesium wrapped inside the calcium oxide is gradually released to perform further desulfurization. This gradual release method is beneficial to promoting the reaction while avoiding the one-time reaction of the passivated magnesium to release a large amount of heat to cause disturbance of the iron water and eliminate safety hazards. The additive has moderate particle size, good absorption effect when used, and simple production process, and can effectively meet the recarburization and desulfurization needs of the phosphorus pig iron.

The utility model relates to the technical field of oxygen lance spray heads, and discloses an oxygen lance spray head capable of improving the oxygen conveying amount. The oxygen lance nozzle capable of increasing the oxygen conveying amount comprises a basic assembly, an expansion assembly is installed at the upper end of the basic assembly, a connecting pipe is installed at the upper end of the expansion assembly, an expansion groove is formed in the connecting pipe, a concentration pipe is installed at the upper end of the connecting pipe, and a first installation groove is formed in the upper end of the concentration pipe; a lifting assembly is installed at the upper end of the expansion assembly, a main end spray head is installed at the upper end of the lifting assembly, a side end spray head is installed at the side end of the main end spray head, a protective cover is installed at the upper end of the side end spray head, and a protective layer is installed on the upper surface of the protective cover. The problems that when the oxygen lance is used, the throat diameter of an internal spray head is small, the follow-up furnace oxygen utilization rate is low, follow-up pig iron cannot be rapidly melted, the internal temperature of a molten pool is uneven, and therefore molten iron consumption is reduced are effectively solved.

The present invention discloses a molybdenum-containing heat-conducting austenitic manganese steel and a preparation method thereof, which relates to the technical field of molybdenum-containing manganese steel and comprises the following processes: mixing pig iron and pure iron and melting them; adding ferrochrome, ferromanganese, ferromolybdenum, ferrotitanium, ferroniobium and chromium nitride, and continuing to melt to form molten steel; discharging the furnace and casting to obtain a blank; and performing heat treatment to obtain austenitic manganese steel. By adding element molybdenum to the manganese steel, carbides are formed with carbon in the manganese steel and are dispersed in the steel, which can optimize the morphology and distribution of carbides in the austenitic manganese steel, reduce defects in the manganese steel, and inhibit dislocation movement, which helps to improve the thermal conductivity of the manganese steel; at the same time, solute atoms around it are depleted, which can further improve its thermal conductivity.