54 results about "Ferroalloy" patented technology

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.

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.

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.

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

An improved atomized powder metal material containing an increased amount of free graphite after heat treatment and / or sintering is provided. The powder metal material is typically a ferrous alloy and includes carbon in an amount of 1.0 wt. % to 6.5 wt. % and silicon in an amount of 0.1 wt. % to 6.0 wt. %, based on the total weight of the powder metal material. The powder metal material can also include various other alloying elements, for example at least one of nickel (Ni), cobalt (Co), copper (Cu), tin (Sn), aluminum (Al), sulfur (S), phosphorous (P), boron (B), nitrogen (N), chromium (Cr), manganese (Mn), molybdenum (Mo), vanadium (V), niobium (Nb), tungsten (W), titanium (Ti), tantalum (Ta) zirconium (Zr), zinc (Zn), strontium (Sr), calcium (Ca), barium (Ba) magnesium (Mg), lithium (Li), sodium (Na), and potassium (K).

The present application relates to the technical field of ferroalloy production equipment, and discloses a ferroalloy casting machine with a crushing function, which comprises a bottom plate and a guide plate arranged on the bottom plate, in the present application, the shallow ingot mold of the first and second placing plates is alternately fed, when the ferroalloy in the shallow ingot mold of the first placing plate is crushed under the crushing plate, the second placing plate synchronously injects and cools the ferroalloy liquid, and the alternate operation shortens the waiting time and improves the production efficiency. The multiple protruding positioning blocks on the lower surface of the crushing plate break along the stress weak part by virtue of the normal temperature brittleness of the ferroalloy, and form blocks of a predetermined size. The tooth rack drives the tooth plate, the connecting plate and the scraper frame to move to the corresponding side of the shallow ingot mold, the crushed ferroalloy is ejected by the top plate, and the scraper frame pushes the crushed blocks into the hopper by moving upward with the crushing plate. The dust suction box in the crushing and conveying process adsorbs dust, the ferroalloy blocks fall into the sleeve to drive the pressing plate to slide, the lifting block reaches the preset switch, the discharge pipe flap is closed, the pressing plate is turned over to discharge the blocks in the sleeve, and the device is intelligentized.

The application discloses a sodium vanadium precipitation wastewater treatment method, comprising the following steps: adding ferrous sulfate into sodium vanadium precipitation wastewater and stirring; stirring, precipitating and filtering after adjusting pH value by using a first alkaline solution to obtain vanadium-iron compound precipitate and a first filtrate; adding tetraacetyl diamine into the first filtrate and stirring; stirring, precipitating and filtering after adjusting pH value by using a second alkaline solution to obtain chromium-silicon compound precipitate and sodium sulfate solution. The scheme provided by the application uses ferrous sulfate for reduction, so that most vanadium is separated by adjusting a certain pH value and filtering, the vanadium can be applied to smelting vanadium-iron alloy, chromium-silicon slag is further recovered and smelted into chromium-iron, silicon is left in the chromium slag as an advantageous regulator for smelting chromium-iron, ammonia is removed in the process of adjusting pH value of the recovered chromium-silicon slag, special ammonia removal is not needed, and vanadium and chromium are not separated through vanadium-chromium filter cake.

This invention belongs to the field of ferromolybdenum alloy smelting technology, specifically relating to a two-stage continuous smelting and casting method and apparatus for ferromolybdenum alloys. This invention couples the aluminothermic rapid reduction reaction with medium-frequency induction refining. The ferromolybdenum alloy liquid is conveyed by gravity through slag blocking and sealing into the medium-frequency refining tundish, completing heat preservation, homogenization, secondary slag removal, and flow stabilization. Subsequently, it is directly and continuously cast into 30-50mm thick ingot-shaped ingots, achieving near-net-shape forming, eliminating crushing and screening. This invention solves the problems of component segregation, high oxygen content, intermittent production, large crushing losses, and severe dust pollution associated with the traditional aluminothermic process for ferromolybdenum. It features a short process, high efficiency, superior quality, environmental friendliness, and high degree of automation. The prepared ferromolybdenum ingots have uniform size, stable composition, and an oxygen content ≤80ppm, and can be directly used in special steel smelting, suitable for the continuous industrial production of high-end ferromolybdenum alloys.

This invention discloses a refining furnace and an emergency handling method for power outages in the refining furnace. The refining furnace includes electrodes, a furnace cover, a ladle, and a rotary table. The ladle is placed on the rotary table, the furnace cover is placed on the ladle, and the electrodes extend into the ladle. It also includes an electrode lifting device, which comprises a conductive horizontal arm, a lifting hydraulic cylinder, and a lifting guide frame. The conductive horizontal arm is slidably connected to the lifting guide frame, and the lifting hydraulic cylinder is fixed inside the lifting guide frame and connected to the conductive horizontal arm. The electrodes are placed on the conductive horizontal arm, and a first pull rope is connected to the conductive horizontal arm. A first fixed pulley is provided on the lifting guide frame. The first pull rope extends downwards after passing over the first fixed pulley and is connected to a counterweight. The weight of the counterweight is greater than the total weight of the electrodes and the conductive horizontal arm. In the event of a sudden power outage, the refining furnace of this invention uses the counterweight's own weight to pull the electrodes upwards, detaching them from the molten ferromanganese alloy in the ladle and preventing the electrodes from burning or sticking due to prolonged immersion in the molten ferromanganese alloy.

A new MRAM memory cell and a manufacturing method therefor, which relate to the field of data storage. The method includes: sequentially including a reference layer, a magnesium oxide tunnel layer and a free layer in a stacking direction. The free layer sequentially includes an interfacial PMA free layer, a free spacer layer and a bulk PMA free layer in a stacking direction, wherein the interfacial PMA free layer is disposed on the surface of the magnesium oxide tunnel layer; the free spacer layer is configured to ferromagnetically couple the interfacial PMA free layer and the bulk PMA free layer; and the interfacial PMA free layer is at least one of a cobalt-containing alloy layer, an iron-containing alloy layer and a cobalt-iron alloy layer, and the bulk PMA free layer is a manganese-based ternary tetragonal alloy layer. In the present invention, an interfacial PMA free layer and a bulk PMA free layer are combined to provide a higher TMR. In addition, a new manganese-based ternary tetragonal alloy is also used as the bulk PMA free layer, which improves the process compatibility and also improves the data retention capability of a device.

This invention relates to the field of metal production or smelting technology, and discloses a method for the commercialization of iron and manganese elements in ferromanganese alloys. The method employs a two-stage leaching process for selective leaching of ferromanganese alloys, comprising: Step S1, adding water to the ferromanganese alloy and / or neutralized leaching residue, introducing a first oxidant, adding a sulfur-containing reagent, adding sulfuric acid, performing a first-stage catalytic oxygen leaching, and separating the solid and liquid to obtain a first leaching solution and iron slag; Step S2, adding ferromanganese alloy to the first leaching solution, adding water, performing a second-stage neutralized leaching, introducing a second oxidant, separating the solid and liquid to obtain a second leaching solution and neutralized leaching residue, and returning the neutralized leaching residue to step S1. This invention achieves the separation of manganese and iron, with a short process flow, low cost, and high efficiency, facilitating industrial production; moreover, iron is directly converted into iron oxide precursor, obtaining high-quality iron products at low cost, and manganese can be made into manganese sulfate solution for the production of battery-grade manganese sulfate, providing a new approach for the preparation of lithium-ion battery cathode precursor materials.

This invention discloses a method for separating and enriching nickel and iron in nickel-iron alloys, as well as nickel-based recovery products. Ferric chloride, containing inherent nickel impurities, obtained from the chlorination roasting of nickel-iron alloys, is used as raw material to prepare a solution. Under ammonium-free conditions, a first iron precipitation agent is added to conduct a first iron precipitation reaction, controlling the pH at 1.5-1.8, resulting in solid-liquid separation to obtain ferric phosphate and a nickel-iron-containing filtrate. The pH of the filtrate is adjusted to 5.2-5.7 to conduct a second iron precipitation reaction, yielding an iron-containing precipitate and a nickel-containing filtrate. The pH of the nickel-containing filtrate is adjusted to 9.5-10.5 to conduct a nickel precipitation reaction, yielding a nickel-containing precipitate. This invention eliminates nickel-ammonia complexation at the source, achieving complete nickel recovery, and simultaneously producing high-purity ferric phosphate and resource-recoverable intermediate products.

This invention relates to the field of alloy additives, and discloses a multifunctional multi-alloy element additive, its preparation method, and its application. The alloy additive comprises multi-alloy powder, flux, and binder. The multi-alloy powder includes at least four of the following: manganese, iron, magnesium, silicon, chromium, nickel, and titanium, and is a multi-particle-size mixture. The flux is a mixture of ferrosilicon alloy powder / ferroaluminum alloy powder and flux, and the flux is a fluoride salt or calcium-based flux. This invention overcomes the limitations of traditional additives that are only suitable for a single industry. In aluminum alloy smelting, it achieves a complete melting time ≤5 min, alloy element recovery rate ≥96.5%, and composition deviation ≤±0.25%. In steel smelting, it achieves a complete melting time ≤3 min, alloy element recovery rate ≥97.2%, and composition deviation ≤±0.3%. Simultaneously, it significantly improves the uniformity of composition and melting distribution, reduces oxidation loss and component segregation, and greatly improves the consistency of mechanical properties between aluminum alloys and steel products. It can be stably applied in aerospace, rail transportation, and high-end equipment manufacturing fields.

This application provides a method for the co-processing of arsenic-iron slag and iron slag generated during zinc smelting, relating to the field of solid waste co-processing. The method includes: mixing arsenic-iron slag, iron slag, a reducing agent, and a flux to prepare pellets; smelting the pellets to obtain an arsenic-iron alloy and arsenic-containing flue gas; and using the cooled arsenic-containing flue gas to prepare the pellets. This solution achieves the co-processing and resource utilization of these two specific industrial wastes, not only reducing environmental impact but also recovering valuable metals from these slags. The reduction smelting process enables the co-utilization of arsenic-iron slag and iron slag, comprehensively utilizing the arsenic and iron generated during zinc smelting, achieving complete resource recovery of arsenic and iron, and reducing the risk of arsenic leakage.

This invention discloses a composite reducing agent for rare earth ferrosilicon alloy smelting, its preparation method, and its application, belonging to the field of rare earth metallurgy. Addressing the problems of low reducing agent utilization and severe silicon loss (approximately 21% of the total added silicon) in traditional silicothermic smelting, this invention, based on the free silicon activity regulation mechanism, designs a composite reducing agent comprising 60-80 parts ferrosilicon, 10-25 parts silicon carbide, 3-10 parts metallic aluminum, and 2-8 parts calcium fluoride. The preparation method involves crushing and mixing the components, adding a binder, and pressing or granulating them. In smelting, a "batch feeding-pressing method" is adopted, with a portion of the composite reducing agent added initially for primary reduction, and the remaining portion pressed into the melt for deep reduction and composition adjustment in the later stages. Through the synergistic effect of silicon carbide-assisted reduction, metallic aluminum deoxidation protection, and calcium fluoride slag system regulation, this invention reduces silicon oxidation loss to below 8%, increases rare earth recovery rate to 88%-94%, an improvement of 15-25 percentage points compared to traditional processes, and reduces smelting power consumption by more than 20%.

This invention provides a low-halogen alkaline oxide composite additive for industrial silicon submerged arc furnaces and its application method. The additive contains at least magnesium and calcium source components, respectively, based on MgO and CaO equivalents. The fluxing and reinforcing component is selected from alkali metal oxides or alkaline earth metal oxides. The additive is added at a rate of 0.03-1% based on silica mass, and the halide content, based on Cl, is ≤0.5%. Using this additive can effectively reduce the softening temperature of siliceous raw materials and the reaction resistance in the furnace, reducing unit power consumption by 2-20% and increasing the daily output of the submerged arc furnace. Simultaneously, under the constraint of low halogen content, the chloride content of the microsilica powder does not increase. The calcium source component can be provided by industrial solid waste such as calcium carbide dust / calcium carbide slag and is compatible with the magnesium source, achieving stable smelting results under the condition of meeting the equivalent ratio. This invention is also applicable to the smelting of silicon-based ferroalloys such as ferrosilicon in submerged arc furnaces, helping to improve furnace stability and iron tapping smoothness.

The application relates to the field of data storage, in particular to a novel MRAM storage unit and a manufacturing method thereof, which comprises a reference layer, a magnesium-containing oxide tunnel layer and a free layer in sequence in a stacking direction; the free layer comprises an interface PMA free layer, a free spacer layer and a bulk PMA free layer in sequence in the stacking direction; the interface PMA free layer is arranged on the surface of the magnesium-containing oxide tunnel layer; the free spacer layer is used for ferromagnetic coupling of the interface PMA free layer and the bulk PMA free layer; the interface PMA free layer is at least one of a cobalt-containing alloy layer, an iron-containing alloy layer and a cobalt-iron-containing alloy layer; and the bulk PMA free layer is a ternary tetragonal alloy layer of manganese. The application combines the interface PMA free layer and the bulk PMA free layer, provides higher TMR, and further adopts a novel ternary tetragonal alloy of manganese as the bulk PMA free layer, improves process compatibility and improves the data retention capability of the device.

Material producible by the following process: • Triglycerides are stirred with 0.1 to 0.5% sulfuric acid (99%); the reaction process can be accelerated by cavitation. • Add 1 to 3% water and let the mixture stand until the water settles, • This settled aqueous solution is heated in the presence of a material made from an iron-containing alloy, for example an alloy comprising iron, nickel, chromium and manganese, in particular approximately 70% iron, 18% chromium, 8% nickel and 1.5% manganese, • The mixture, which boils at 80 °C, is heated to just under 100 °C until the water has evaporated, and is kept at this temperature until the now viscous mass begins to release water of crystallization; then the heat supply is stopped.

The application provides a high-temperature liquid ferroalloy continuous granulation forming process and belongs to the technical field of granulation forming of ore smelting furnaces, solves the problem that the traditional large ingot mold casting process seriously restricts the development of the industry, and the application comprises a ladle, a holding furnace, a first-stage water-cooling rolling way, a second-stage rolling forming rolling way, a third-stage self-cooling rolling way, a fourth-stage spiral rolling way, a spraying water-cooling system, a first-stage air-cooling drying system, a second-stage dehydration drying system, a third-stage air-cooling drying system, an intermediate storage bin, a finished product storage bin, a finished product packaging system; the high-temperature liquid ferroalloy is shaped after temperature adjustment in the holding furnace and is preliminarily cooled after length cutting; the high-temperature liquid ferroalloy forms a semi-solid alloy, the semi-solid alloy is sequentially subjected to shape strengthening in the second-stage rolling forming rolling way to form alloy particles; the alloy particles are cooled and dried and finally sent out. The application realizes integrated production from high-temperature metal liquid to solid qualified products and improves the finished product rate of products.

This invention discloses a method for preparing high-purity rare-earth ferrosilicon alloys, belonging to the field of pyrometallurgical technology. Addressing the stringent purity requirements (oxygen content ≤50ppm, sulfur content ≤100ppm) for rare-earth ferrosilicon alloys in high-end manufacturing, and the technical challenges of deep removal of impurities and poor compositional uniformity in existing preparation processes, this invention provides a method for preparing high-purity rare-earth ferrosilicon alloys integrating "deep raw material purification - multi-stage vacuum refining - directional solidification purification - application-oriented compositional control". The method includes: preparing an intermediate alloy using high-purity rare-earth oxides, high-purity silica, and steel scrap as raw materials through carbothermic reduction; placing the intermediate alloy in a vacuum induction melting furnace and performing multi-stage refining under a vacuum of ≤10Pa, selectively removing volatile impurities through segmented temperature control; performing deep deoxidation and desulfurization using composite refining agent injection technology; achieving interfacial segregation separation of impurity elements through directional solidification technology; and finally, performing atmosphere-protected annealing and compositional fine-tuning according to the target application field. Based on the multi-stage synergistic purification mechanism of "thermodynamic selective volatilization-kinetic spray reaction-crystal growth interface segregation", the rare earth ferrosilicon alloy prepared by this invention has an oxygen content of ≤45ppm, a sulfur content of ≤80ppm, and a rare earth element distribution non-uniformity of ≤±2%, which meets the application requirements of high-end fields such as aerospace high-temperature alloys, nuclear reactor control materials, and semiconductor sputtering targets.

The application relates to the technical field of automobile steel plate production, in particular to a 2.2GPa-grade aluminum-silicon plated steel plate, a manufacturing method thereof, a hot stamping method and a hot stamping forming piece, molten steel meeting component requirements after smelting is subjected to hot dipping after being cast, hot-rolled and pickled, and through the synergistic design of components, structures and processes, an aluminum-silicon plated steel plate suitable for hot stamping forming is produced, the hot stamping forming piece obtained by adopting the steel plate and the matched hot stamping method contains more than 97% of martensite structure, the rest is ferrite + residual austenite + bainite, the plating layer is completely converted into a ferroalloy layer after hot stamping, the strength of the hot stamping forming piece can reach 2000-2400 MPa, the elongation is greater than 5%, the hot stamping forming piece has good strength and toughness matching, and simultaneously has excellent corrosion resistance and excellent anti-delayed cracking performance.

This utility model discloses a bismuth-manganese-iron alloy cored wire feeding device, relating to the field of cored wire production technology. It includes a workbench with a housing fixedly connected to its upper side. A "T"-shaped groove is formed on the housing, comprising a cavity and an opening. Drive groups are arranged on both sides of the inner wall of the cavity along the length of the housing. A transmission group is arranged between the two drive groups. The transmission group includes two relatively movable connecting plates. Several rotatable rollers are arranged on opposite sides of the two connecting plates. A bracket is rotatably connected to the side of each roller near the connecting plate. A guide post is fixedly connected to each of the four corners of the bracket near the connecting plate. A spring is sleeved on the guide post. The guide post passes through the connecting plate and is slidably connected to it. The two ends of the spring along the axis of the guide post are in direct contact with the connecting plate and the bracket, respectively. This device improves the stability of cored wire feeding transmission.

This application belongs to the field of metallurgical technology, specifically relating to a method for hydrogen-based reduction and stepwise enrichment of iron, niobium, and rare earth elements from low-grade rare earth tailings, comprising the following steps: S1, obtaining low-grade rare earth tailings, and performing hydrogen-based reduction on the low-grade rare earth tailings to obtain a first rare earth ore, wherein, by mass percentage, the composition of the low-grade rare earth tailings includes: Fe: 10%-20%, Nb: 0.01%-0.3%, rare earth: 2%-10%; the mass ratio of iron oxide to niobium oxide in the first rare earth ore is 100:(6-12); S2, performing a first melting separation on the first rare earth ore to obtain metallic iron and a second rare earth ore; S3, mixing the second rare earth ore with a reducing agent and performing a second melting separation to obtain niobium-iron alloy and rare earth-rich ore. This application combines hydrogen-based selective reduction of iron with reduction smelting of ferro-niobium alloys. By controlling the degree of hydrogen reduction, an appropriate amount of FeO is retained in the slag, improving the slag properties and providing an endogenous iron source for ferro-niobium smelting, thereby achieving efficient enrichment and separation of iron, niobium, and rare earth elements.

The application discloses a preparation method of modified high-carbon ferrochrome based on a pre-reduction technology and belongs to the technical field of ferroalloy metallurgy. The method comprises the following steps: uniformly mixing chromite concentrate, coke powder, lime and a silicon dioxide-titanium dioxide nano composite modifier to obtain a mixture; performing solid-state pre-reduction on the mixture in a rotary kiln, and controlling the pre-reduction degree to be 45-70%; loading the pre-reduced material into a submerged-arc furnace, smelting and reducing at 1650-1800 DEG C for 4-8 hours, until slag and iron are separated, and modified high-carbon ferrochrome is obtained. The nano composite modifier is prepared by a sol-gel method, is dispersed at a slag-gold interface during the pre-reduction and smelting processes, promotes uniform nucleation of ferrochrome carbide, and optimizes the microstructure of the molten slag. The application significantly improves the chromium recovery rate, reduces unit power consumption, improves the slag-iron separation effect, and realizes efficient, low-consumption and clean production.

Provided are an Fe-based alloy having a high saturation magnetic flux density and minimized losses as the coercive force decreases, and an electronic component using the same. 【Solution means】 One embodiment of the present invention is (Fe (1-x) Co x ), a Si b B c P d Nb e Cu f C g represented by the composition formula, where x, a, b, c, e, g satisfy the conditions of 10 ≤ x ≤ 20, 80.0 ≤ a ≤ 82.0, 0 ≤ b ≤ 4.0, 8.0 ≤ c ≤ 12.0, 0 ≤ d ≤ 4.0, 1.0 ≤ e ≤ 3.0, 0.5 ≤ f ≤ 1.0, 0 ≤ g ≤ 2.0, to provide an Fe-based alloy.

This invention relates to the field of metallurgical control technology, and more particularly to a method and system for electrode feed control in a ferroalloy electric arc furnace. The method includes: acquiring the operating parameters of the ferroalloy electric arc furnace; calculating the ideal arc length corresponding to each phase electrode based on the operating parameters, and determining the initial target feed amount for each phase electrode based on the difference between the ideal arc length and the current arc length; performing arc stability analysis on the current and voltage values ​​of each phase electrode, and generating electrode position compensation amounts for each phase motor to suppress arc fluctuations; performing power balance optimization calculations based on the initial target feed amount, electrode position compensation amounts, and pre-acquired three-phase power imbalance, and generating independent feed control commands to drive the action of each phase electrode; and executing each independent feed control command to adjust the feed position of the corresponding electrode. This invention can comprehensively respond to multi-dimensional operating parameters and achieve multi-objective synergistic optimization of arc stability, power balance, and electrode loss.

This invention provides a method for preparing low-alumina fused mullite products and ferrosilicon alloys from coal gangue, belonging to the field of refractory materials technology. The method includes: mixing coal gangue, alumina-rich raw materials, and a reducing agent; melting the mixture; and then separating the mixture to obtain low-alumina fused mullite products and ferrosilicon alloys. The molar ratio of C in the reducing agent to the total Fe2O3 in the coal gangue and alumina-rich raw materials is (3.5~6.5):1; the melting temperature is 1800~2000℃. This invention utilizes a high reaction temperature, allowing for a complete reaction between Al2O3 and SiO2. By precisely controlling the amount of reducing agent added, Fe2O3 in the coal gangue is reduced to Fe, which then alloys with the reduced Si to form a ferrosilicon alloy. This achieves efficient separation of impurity iron from the product in the molten state, thereby improving the purity of the low-alumina fused mullite products.

The application provides a ferroalloy particle size detection device, which comprises a base, a first mesh screen and a second mesh screen are fixed on the base through a stand column and are distributed upwards and downwards, the downwardly inclined discharge ends of the first mesh screen and the second mesh screen are respectively located at two ends in opposite directions, the lower end of the second mesh screen is fixed with a conical cover, three weighing devices are fixed on the base, the three weighing devices are respectively corresponding to the discharge ends of the first mesh screen and the second mesh screen and the discharge pipe position of the conical cover, a powder bucket is arranged on the weighing device below the conical cover, a large block bucket and a broken block bucket are respectively arranged on the weighing devices below the discharge ends of the first mesh screen and the second mesh screen. The ferroalloy particle size detection device can quickly separate the qualified material broken blocks in a ton bag through screening and directly weighing, thereby saving the transfer step and improving the detection efficiency. The powder material, the large block material and the qualified broken block material of the ferrosilicon-manganese alloy are weighed respectively, the proportion of the three kinds of materials in the total amount is calculated, and whether the particle size of the ferrosilicon-manganese alloy meets the use standard is determined.