270 results about "Ferroalloy" patented technology

Systems and methods described herein may include pumps and pump components including carbon-manganese-chromium (C—Mn—Cr)-based steel alloys for enhanced resistance to wear or corrosion. A pump component may include one or more components formed of a C—Mn—Cr-based ferrous alloy, which may result in enhanced wear or corrosion resistance. The C—Mn—Cr-based ferrous alloy may include a carbon content ranging from about 0.1 weight percent (wt. %) to about 2 wt. %, a manganese content ranging from about 10 wt. % to about 30 wt. %, and a chromium content ranging from about 0.1 wt. % to about 20 wt. %.

The invention relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method of the high-temperature-resistant flux-cored wire. The high-temperature-resistant flux-cored wire containing the rare earth elements comprises a welding wire skin and a flux core. The flux core comprises the following raw materials of dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, ferro-aluminum, potassium cryolite, potassium titanate, sodium titanate, fine iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, nitrided ferrochrome, bismuth oxide, auxiliaries and the balance reduced iron powder. The auxiliary agent is a mixture of a zirconium-iron alloy, a titanium-iron alloy and an aluminum-magnesium alloy. A specific alloy auxiliary is introduced into the flux core to protect stable transition of rare earth yttrium, yttrium and multiple components synergistically optimize the weld joint performance, 253MA heat-resistant steel is matched, slag and electric arc regulation and control components and a reasonable process are matched, and the welding quality of the welding wire is improved.

Herein discussed is a heat management system comprising a pipe and a static auger inside the pipe, wherein the pipe has an inner diameter of d, wherein the auger has an outer diameter D and a pitch P, wherein the ratio of D / P is no less than 1, and wherein the auger outer diameter D is no less than 90% of the pipe inner diameter d. In an embodiment, the ratio of D / P is in the range of 2-10, or 2-5, or 2-4, or 5-10. In an embodiment, the pipe is made from stainless steel, carbon steel, Monel, Inconel, Incoloy, Hastelloy, ceramics, silicon carbide, alumina, and combinations thereof. In an embodiment, the system comprises a fluid passing through the pipe, wherein the pipe heats or cools the fluid.

The invention relates to the technical field of self-baking electrodes, in particular to an alternating-current variable-frequency self-baking electrode baking state prediction method for an iron alloy submerged arc furnace, which comprises the following steps: acquiring input parameters of a self-baking electrode, and simplifying an electromagnetic field and a heat transfer process related to the self-baking electrode into a two-dimensional axial symmetry state; constructing an electromagnetic field mathematical model, and obtaining expressions of the magnetic field intensity and the current density of the self-baking electrode; constructing a temperature field mathematical model of the self-baking electrode of the submerged arc furnace and an expression of electrode pressure release time; a finite volume method is utilized to discretize an electromagnetic field mathematical model and a temperature field mathematical model, and on the basis of input parameters and electromagnetic thermal boundary conditions, an implicit solution method which is good in convergence and stability and can achieve a large grid size is adopted to solve the magnetic field intensity, the current density, the temperature distribution and the electrode pressure release time of the self-baking electrode. The method can accurately and quickly predict the electrode pressure release time, and effectively reduces the roasting control cost of the self-roasting electrode of the submerged arc furnace.

The invention discloses a clean preparation method of a rare earth ferrosilicon alloy based on cooperative control of carbon addition and silicon supplement, and belongs to the technical field of thermometallurgy. In order to solve the problems that according to an existing carbon thermal reduction method, the furnace bottom is prone to nodulation, the recovery rate is low, and energy consumption is high, the'carbon addition-silicon supplementation-carbon depletion 'ternary cooperative regulation and control method is provided. Comprising the following steps: taking a rare earth-containing material, a siliceous raw material and a carbonaceous reducing agent as raw materials, burdening, pelletizing, and adding into a submerged arc furnace for reduction smelting; the core technology is that the weight ratio of oxide to reducing agent carbon in the rare earth pellets is controlled to be 1: (1.20-1.30), meanwhile, a silicon element accounting for 2.0-10.0% of the weight of the oxide is added, and parameters meet the coupling relational expression S = k * (1.30-R) * 100% + S0; and the smelting adopts carbon deficit operation, and the carbon addition amount is 0.90-0.95 times of the theoretical amount. The method inhibits the generation of the rare earth carbide nodule at the furnace bottom from the aspects of thermodynamics and dynamics, and realizes continuous and stable production. The rare earth recovery rate reaches 96% or above, the comprehensive power consumption is reduced to 8600-9000 kWh / t, the furnace life is prolonged to 25 months or above, and remarkable economic and environmental benefits are achieved.

The invention provides a method for short-process all-component echelon recovery of a waste hydrogenation catalyst, and relates to the field of solid waste treatment. The recovery method of the waste hydrogenation catalyst comprises the following steps: roasting the waste hydrogenation catalyst and sodium carbonate to obtain a roasted product; the roasted product is leached with water, and leaching liquid and leaching residues are obtained; extracting the leaching solution by using an extracting agent to obtain a vanadium-molybdenum-containing organic phase, sequentially carrying out reverse extraction treatment on the vanadium-molybdenum-containing organic phase by using a strong alkaline reverse extraction agent and a weak alkaline reverse extraction agent to obtain a vanadium reverse extraction solution and a molybdenum reverse extraction solution, and carrying out vanadium precipitation treatment on the vanadium reverse extraction solution to obtain ammonium metavanadate; acidizing the molybdenum strip liquor to precipitate molybdenum to obtain ammonium molybdate; carrying out sintering treatment on the leaching residues and alkaline substances, leaching obtained calcine with water to obtain water leaching residues and filtrate, and carrying out aluminum precipitation treatment on the filtrate to obtain aluminum hydroxide, aluminum oxide or pseudo-boehmite; and reducing and smelting the water leaching residues to obtain the ferro-nickel alloy. According to the invention, multi-element comprehensive recovery of all components of vanadium, molybdenum, nickel, aluminum and sulfur can be realized, and high-value utilization of all components of the waste hydrogenation catalyst is realized.

The invention relates to the technical field of metallurgy, in particular to a reducing agent suitable for a large submerged arc furnace and application thereof. The reducing agent for the large submerged arc furnace comprises the following raw materials: small-particle semi-coke, medium-particle semi-coke, metallurgical coke particles and electrode hard broken ends. The broken end after hard breaking of the electrode is applied to a large submerged arc furnace to serve as a reducing agent to be combined with an existing reducing agent, when the mass ratio of the broken end particles of the hard breaking of the electrode in the reducing agent is 4.5%-6.5%, the problem of hazardous waste treatment of the broken end of the electrode is solved, meanwhile, the reducing agent at the bottom of the furnace is supplemented, the smelting production cost is reduced, and economic benefits and environmental protection benefits of iron alloy production are improved.

This invention discloses a method for extracting aluminum from fly ash, red mud, and coal gangue and preparing ferrosilicon alloy, belonging to the field of solid waste resource comprehensive utilization technology. The key technical points include: raw material pretreatment, material mixing, roasting reaction, alkali dissolution carbon treatment, and separation and purification steps. Coal gangue is used as a carbonaceous reducing agent, mixed with fly ash, red mud, or iron-containing powder in a specific ratio, roasted under an inert atmosphere or vacuum environment, and then aluminum hydroxide is extracted by alkali dissolution carbon. Finally, ferrosilicon alloy and corresponding byproducts are obtained by wet magnetic separation. This invention achieves synergistic high-value utilization of multiple industrial solid wastes, reduces the environmental pressure of solid waste storage, and has the advantages of short process, low energy consumption, low cost, and high product purity, making it suitable for large-scale industrial applications.

The application provides an iron alloy product processing device, which comprises a box body, a ton bag packaging machine, a feeding hopper arranged at the upper end of the box body, a temporary storage bin arranged at one end of the box body, a conveying device arranged on the outer wall of the box body and extending into the feeding hopper and having a closed structure, a collecting box sealingly connected to the lower end of the box body, a crushing structure and a vibrating mounting frame arranged in the box body, a sieve plate I and a sieve plate II arranged on the mounting frame, a material guiding structure connected to one end of the sieve plate I and extending into the conveying device from the inside of the temporary storage bin, a material guiding groove connected to one end of the sieve plate II and extending into the temporary storage bin, a conveyor I arranged below the temporary storage bin and used for conveying materials to the ton bag packaging machine, dust hoods arranged between the feeding hopper position, the temporary storage bin and the conveyor I, and bag dust collectors connected to the dust hoods. The application can reduce the number of dust hoods, reduce the dust prevention cost, use the bag dust collector with small power to ensure the dust removal effect, and reduce the energy consumption.

The invention provides a preparation method of a ferromanganese phosphate precursor and a lithium ferromanganese phosphate positive electrode material, and the preparation method of the ferromanganese phosphate precursor comprises the following steps: S1, sequentially crushing, grinding and screening a ferromanganese alloy to obtain ferromanganese alloy powder; s2, the ferromanganese alloy powder is roasted and crushed in the oxygen atmosphere in sequence, and ferromanganese oxide powder is obtained; and S3, mixing the ferromanganese oxide powder and a phosphoric acid solution, carrying out a hydrothermal reaction, drying, dehydrating, and crushing to obtain the ferromanganese phosphate precursor. The ferromanganese phosphate precursor is prepared from the ferromanganese alloy, additional manganese source and iron source compounds do not need to be introduced, the product uniformity and stability are good, and the cost is lower. According to the invention, the atomic-level uniform dispersion of manganese and iron elements in the ferromanganese precursor is realized, the problem of dissolution of manganese is avoided, and the structural stability and electrochemical performance of the material are improved. The method is easy to industrialize.

The application discloses a high-carbon ferromanganese iron powder remelting process, which comprises the following steps: step one, pickling: high-carbon ferromanganese iron powder is subjected to pickling under the action of a pickling solution, so that a surface oxide layer is removed, and deoxidized ferromanganese iron powder is obtained; and step two, ultrasonic cleaning: the deoxidized ferromanganese iron powder obtained in step one is added into an ultrasonic cleaning machine for cleaning, so that surface stains and grease are removed. After preheating and degassing, nitrogen and oxygen of the ferromanganese sintered block are detected, and ingredients are prepared according to the nitrogen content, so that the ingredient amount is more reasonable, and the quality of the high-carbon ferromanganese alloy is improved. Moreover, the deoxidized skin of the high-carbon ferromanganese iron powder is removed outside the furnace, so that the deoxidized skin does not need to be removed by using a lossy reagent covering agent in the furnace, the alloy is less damaged, and the ferromanganese burning loss is reduced. As a result, the formed manganese oxide slag is less, the quality of the high-carbon ferromanganese finished product is greatly improved based on the above two points, the chemical composition of the high-carbon ferromanganese finished product is uniform, and the prepared high-carbon ferromanganese alloy has higher hardness and toughness.

This hot-stamped part comprises a steel sheet, an Al-Fe alloy plating layer disposed on a surface of the steel sheet, an Al oxide layer disposed on a surface of the Al-Fe alloy plating layer, and a film disposed on a surface of the Al oxide layer. The film contains an amphoteric oxide of a d block element. When the average particle diameter of the amphoteric oxide is noted as Bs in unit of nm and the thickness of the Al oxide layer X is noted as Xt in unit of nm, Bs / Xt is 0.010 to 2.000.

This invention relates to the field of ferroalloy smelting technology and discloses a high-carbon ferromanganese and its preparation method, comprising the following steps: raw material pretreatment; converter preheating and bottom material laying: pretreated high-grade manganese ore, lime, and coke powder are mixed and added as bottom material to the CLU converter for preheating; iron addition and initial reduction: high-carbon ferromanganese is added to the converter, and graphite fragments are added, and initial reduction is carried out under a pure argon atmosphere; atmosphere control and second-stage reduction: when the carbon content of the molten iron drops to 5.0-5.8%, the reblowing gas is switched to a mixed gas of argon, CO, and CH4, and the remaining high-grade manganese ore, silicon carbide, ferrosilicon manganese alloy, and supplementary coke powder are added in batches, while adjusting the slag composition; endpoint judgment and iron tapping. The high-carbon ferromanganese of this invention has precise composition and high purity, and the preparation method is characterized by high efficiency, low consumption, greenness, and high manganese recovery rate, enabling the industrial-scale production of high-carbon ferromanganese.

A briquette and binder for use in making the same are disclosed. The briquette including: a ferrous or ferro-alloy steel by-product; a binder mixture making up about 0.025% to about 10% of a batch weight, the binder mixture including: a polyvinyl alcohol resin comprising about 0.025% to about 30% of the binder mixture; a sodium hydroxide and diethanolamine phenolic resin comprising about 1% to about 20% of the binder mixture; and water making up the remainder of the binder mixture; a resin powder comprising about 0.01% to about 10% of the batch weight; and where the briquette, when cured, includes about 0.05% to about 10% of the binder mixture.

The invention discloses a rare earth silicon carbon composite deoxidizer with a double-component design. The deoxidizer comprises the following components in percentage by mass: 20-30% of rare earth silicon iron alloy particles with the particle size of 5-10 mm, 70-80% of carbon particles with the particle size of 1-5 mm, and a binder, wherein the first deoxidizer comprises the following components in percentage by mass: 20-30% of rare earth silicon iron alloy particles with the particle size of 5-10 mm; and the second deoxidizer comprises the following components in percentage by mass: 80-90% of rare earth ferrosilicon alloy particles with the particle size of 5-10 mm, 10-20% of carbon particles with the particle size of 1-5 mm, and the balance of a binder. The invention also discloses a deoxidation method during use. According to the deoxidizing method, the deoxidizing efficiency is high, the cost is low, safety and stability are achieved, deoxidizing products are few, the performance of steel is not affected, and meanwhile the deoxidizing agent capable of replacing expensive aluminum materials and the deoxidizing method capable of being accurately controlled are achieved.

The utility model discloses a ferro-silicon alloy screening and classifying device, which belongs to the technical field of ferro-silicon alloy processing equipment and comprises a screening box, a screening component for sorting ferro-silicon alloy, a dust absorption component for absorbing and transferring dust generated in the sorting process and a purification component for purifying dust gas, the dust collection assembly is arranged on one side of the screening box, the purification assembly is arranged on the dust collection assembly, the screening assembly is arranged in the screening box, a connecting assembly is arranged between the screening box and the screening assembly, a sealing assembly is arranged on the purification assembly, and an inclined plate is fixedly arranged on the inner bottom wall of the screening box; dust gas in the screening box is absorbed and transferred under the action of the dust absorption assembly, and the dust gas is purified under the action of the purification assembly, so that the dust content in the air is reduced, and the situation that a respiratory system and the like of an operator are possibly damaged and occupational diseases such as pneumoconiosis are caused by long-term inhalation of ferrosilicon alloy dust is avoided.

The application relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method thereof. The high-temperature-resistant flux-cored wire containing rare earth elements comprises a wire sheath and a core; the core comprises the following raw materials: dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, aluminiferous iron, potassium cryolite, potassium titanate, sodium titanate, iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, chromium-iron nitride, bismuth oxide, an additive, and the balance of reduced iron powder; the additive is a mixture of zirconium-iron alloy, ferrotitanium alloy and aluminum-magnesium alloy. The application introduces a specific alloy additive into the core to protect the transition of the rare earth yttrium, optimizes the welding performance of the yttrium and multiple components in cooperation, matches the 253MA heat-resistant steel, adjusts the components of the molten slag and the electric arc, and reasonably processes the technology, so that the welding quality of the wire is improved.

The invention belongs to the technical field of metallurgy, and particularly relates to a smelting method of low-titanium high-carbon chromium bearing steel. Through full-process titanium content control, the method comprises the following steps: adopting low-titanium waste steel and molten iron, and controlling the alkalinity of the electric furnace slag to be 2.0-4.0 and the FeO + MnO content to be 20-30%; slag is strictly stopped during tapping, and the slag discharge amount is controlled to be smaller than or equal to 3 kg per ton of steel; after tapping, adding a low-titanium ferrochrome alloy, standing, and removing titanium-containing top slag; during LF refining, a low-titanium iron alloy, a carburant and a diffusion deoxidizing agent are used, and a barium composite slag modifier composed of BaO, CaO, Al2O3 and rare earth oxide is added; rH is matched with vacuum degassing and soft argon blowing stirring; and during continuous casting, double-layer crystallizer casting powder composed of low-oxidability lower-layer slag and CaO2-containing upper-layer covering slag is adopted. Through the synergistic effect of the links, the titanium content of the rolled metal is stably controlled to be 0.001% or below finally, titanium nitride inclusions are effectively reduced, and the fatigue life of the bearing steel is remarkably prolonged.

The invention discloses champagne rhinestones and a vacuum coating color changing method, and belongs to the technical field of rhinestones. The method comprises the steps that S101, a template is transferred, wherein rhinestones are transferred to the template; s102, bias plasma cleaning is conducted, specifically, the template is transferred to a coating chamber, vacuumizing and heating are conducted, and then bias plasma cleaning is conducted; s103, aluminum oxide layer plating: after vacuum cleaning, an aluminum oxide target material is adopted for vacuum coating to form an aluminum oxide layer, and the coating conditions are as follows: the current is 50-70 A, the time is 100-130 S, and the vacuum degree is 5.0-7.0 * 10 <-1 > Pa; in the step S104, oxygen is introduced, ferrochrome is adopted for vacuum coating to form the ferrochrome layer, and the coating conditions are that the current ranges from 50 A to 70 A, the time ranges from 220 S to 270 S, and the vacuum degree ranges from 7.5 * 10 <-1 > Pa to 9.0 * 10 <-1 > Pa; and S105, discharging is conducted, specifically, after cooling is conducted, air is introduced, and then the template is taken out of the coating chamber.

The invention discloses an industrial silicon, silicon iron and silicon series iron alloy totally-closed ore-smelting electric furnace, and relates to the technical field of ore-smelting electric furnaces, the industrial silicon, silicon iron and silicon series iron alloy totally-closed ore-smelting electric furnace comprises a closed furnace body, a power supply system, a water cooling system and a feeding system, the closed furnace body is installed on a base, and a top platform is fixedly connected to the top of a base layer and located above the closed furnace body; a smoke hood is placed on the top of the closed furnace body, the smoke hood and the closed furnace body are sealed through a second fine sand filler (sand seal) or (air seal), the sealing performance between the closed furnace body and the smoke hood is ensured, and furnace gas leakage is prevented. The sealing device can prevent smoke or coal gas in the furnace from overflowing when the electrode holder moves up and down, the sealing device can move along with the adjustment of the diameter of the electrode center circle, and a lifting point fixedly installed at the top of the smoke hood is hung at the bottom of the top platform through a lifting appliance.

The present invention addresses the problem of providing a resin composition which can achieve a high relative permeability in a low frequency band and which has an excellent appearance when applied. The solution of the present invention is a resin composition containing a thermosetting resin and an iron alloy-based magnetic powder, in which, when the non-volatile components of the resin composition are taken as 100 vol%, (a) the content of the iron alloy-based magnetic powder having a particle diameter of more than 20 [mu] m and 50 [mu] m or less is 26 vol% to 45 vol%, and (b) the content of the iron alloy-based magnetic powder having a particle diameter of more than 20 [mu] m and 50 [mu] m or less is 25 vol% to 45 vol%. (b) the content of the iron alloy-based magnetic powder having a particle size of more than 2 [mu] m and 20 [mu] m or less is 28-68 vol%, inclusive, and (c) the content of the iron alloy-based magnetic powder having a particle size of 2 [mu] m or less is 1-41 vol%, inclusive.

The present application belongs to the technical field of stainless steel smelting, and particularly relates to a method for smelting 310S stainless steel based on low-grade nickel-iron alloy. The method comprises the following steps: S1, pouring low-grade nickel-iron melt into No. 1 AOD furnace, resetting No. 1 AOD furnace for blowing, and obtaining first enriched nickel-iron melt; S2, entering blowing period; S3, entering screening furnace period; S4, pouring the enriched high-grade nickel-iron melt into a clean ladle for standby, then pouring chromium-iron melt into No. 2 AOD furnace which is fully roasted, and finally pouring the high-grade nickel-iron melt into the chromium-iron melt to form 310S mother liquor, and starting smelting; S5, entering steel-making period; S6, entering oxidation-reduction period; S7, entering refining period; S8, after soft blowing and slag breaking, deep deoxidation is performed to purify the steel melt; and S9, continuous casting. The smelting process can greatly reduce the cost per ton of steel, and can also fully meet the requirements of 310S stainless steel products on nickel, phosphorus and sulfur contents.

The invention discloses a method for preparing an iron-chromium-cobalt alloy by using cobalt slag and ferrochrome slag, and belongs to the technical field of metallurgy and comprehensive utilization of resources. According to the method, zinc hydrometallurgy byproduct cobalt slag and ferrochrome alloy smelting byproduct ferrochrome slag serve as main raw materials, aluminum blocks and lime are matched, after drying, crushing, fine grinding and mixing are conducted, an aluminothermy self-propagating reduction reaction is triggered through electric auxiliary heating, high-temperature smelting is conducted at the temperature larger than or equal to 1500 DEG C, and finally the ferrochrome cobalt alloy is obtained through slag-metal separation and casting forming. According to the method, high-valued utilization of the dangerous waste residues is achieved, the process is simple, cost is low, energy consumption is low, the obtained alloy is low in carbon content and excellent in magnetic performance (residual magnetism is not smaller than 1.365 T, coercive force is not smaller than 48.63 kA / m, and magnetic energy product is not smaller than 48.26 kJ / m < 3 >), and the method is suitable for the field of permanent magnet materials and related high-end manufacturing.

A cast lip for an excavator bucket composed of a ferrous alloy having at least seven percent chromium by weight, between 3%-6% nickel by weight, and =0.12% carbon by weight, and a mainly martensitic structure.

This invention belongs to the field of ferroalloy smelting technology and industrial process control technology. Specifically, it discloses an intelligent smelting method for high-carbon ferrochrome alloys based on a submerged arc furnace. The method includes: generating a comprehensive material surface state map by collecting material surface state and temperature data; analyzing the overall spatial distribution pattern of grid cells based on the state map to diagnose the overall furnace condition; triggering corresponding global control commands if abnormalities are found; and comparing the material surface sinking height, raw material sinking speed, current temperature, and temperature change rate of each grid cell with preset evaluation criteria to diagnose local furnace conditions if the overall furnace condition is healthy. For healthy cells, precise quantitative material replenishment is calculated when the sinking height meets the standard, and the replenishment azimuth angle is determined through polar coordinate transformation. For abnormal cells, differentiated local control commands are triggered based on their abnormal characteristics. This invention achieves closed-loop intelligent control of the submerged arc furnace smelting process from global perception to precise local control, effectively improving smelting efficiency.

Disclosed is a method for producing steel, ferrous alloys or pig iron, and a melting furnace installation, which use ammonia.

The utility model discloses an automatic demolding mechanism for separating ferrosilicon from an ingot mold, relates to the technical field of ferrosilicon demolding, and solves the problems of low efficiency and potential safety hazards of manual demolding of ferrosilicon in a movable ingot mold vehicle in the prior art. Comprising a movable chassis, a base is connected to the movable chassis, a silicon iron ingot mold is rotationally connected to the base, a first hinged air cylinder assembly is connected between the silicon iron ingot mold and the movable chassis, a pouring assembly is further rotationally connected to the base, and a second hinged air cylinder assembly is connected between the pouring assembly and the movable chassis. The pouring assembly is arranged above the silicon iron ingot mold; an ingot mould ferrosilicon knocking device is arranged on one side of the movable chassis; and a hopper is arranged at the end part of the movable chassis. The device has the beneficial effects that the ferrosilicon ingot mold can be knocked through the hammer body on the knocking support, manual intervention in demolding work is reduced, the production efficiency is improved, and the working safety is improved.

The application discloses a preparation method of a chromium-containing geopolymer material and application of the chromium-containing geopolymer material in a steelmaking process, and belongs to the field of geopolymer materials. The preparation of the chromium-containing geopolymer material mainly utilizes an adsorption method and a direct incorporation method to add chromium ions into the geopolymer material. The chromium-containing geopolymer material has wide raw material sources, simple preparation process and low production cost. The chromium-containing geopolymer material, a reducing agent and slag-making material are added before molten steel enters refining, the chromium element in the chromium-containing geopolymer material is reduced into metallic chromium into molten steel by the reducing agent in the process of a steelmaking converter, complete or partial replacement of ferrochrome is realized, and the smelting cost of the chromium-containing steel is reduced. Meanwhile, the application can also realize large-scale treatment of chromium-containing wastewater, is an adsorbent with excellent performance, realizes high added value utilization of solid waste resources, and greatly reduces environmental pollution caused by ferrochrome, and the chromium-containing geopolymer material prepared by the method has great advantages and application prospects in the steelmaking process.

The invention discloses a method for producing D50 low-carbon ferrochrome, and relates to the technical field of ferroalloy smelting. A method for producing D50 low-carbon ferro-chrome comprises the following steps that S100, high-carbon ferro-chrome molten iron is adopted as an initial raw material, and the high-carbon ferro-chrome molten iron is directly charged into an AOD refining furnace in a hot charging mode in the molten state; s200, according to the result of the pre-calculation model, a certain amount of solid chromium ore, lime and other fluxing agents are added into the AOD refining furnace; s300, a bottom blowing stirring system of the AOD refining furnace is started, and oxygen and inert gas which are mixed according to a certain proportion are blown into the molten pool through the pre-calculation model; s400, under the combined action of control of the bottom blowing stirring system and the pre-calculation model, a selective oxidation reaction for decarburization and chromium protection is carried out in the molten pool, and decarburization refining is carried out; and S500, products D50 low-carbon ferrochrome and low-chromium slag are finally produced. The method not only can efficiently and stably produce the D50-grade low-carbon ferrochrome, but also can greatly reduce the cost and obviously improve the resource recovery rate.

This invention relates to a steelmaking method for adding slag-forming materials outside the converter furnace, belonging to the field of steelmaking technology in iron and steel metallurgy. It includes: 1) calculating the amount of various slag-forming materials to be added using a slag calculation model; 2) placing the scrap steel hopper on the scrap steel scale in advance, and using a loader to load various slag-forming materials into the bottom of the scrap steel hopper according to the calculation results; 3) after adding all the slag-forming materials to the bottom of the scrap steel hopper, using a crane to add various types of scrap steel into the scrap steel hopper; 4) after the converter tapping is completed, slag splashing and furnace protection operations are performed first, and after the slag is splashed dry, all the slag is poured into the slag basin; 5) the converter is then rocked to 45-50° to add scrap steel, and then the ferroalloy charging operation is performed; 6) after ferroalloy charging is completed, the converter is first rocked backward to about 28-32°, and then rocked back to the "zero position"; 7) the oxygen lance is lowered to the blowing lance position, nitrogen is first purged for about 25-35 seconds, the nitrogen is turned off, and oxygen is immediately switched to for ignition.