282 results about "Ferrous metallurgy" patented technology

The invention belongs to the field of ferrous metallurgy, and particularly relates to a method for improving the quality of a continuous casting billet through ultrasonic waves. According to the method, a multi-directional focused ultrasonic field and solidification front edge dynamic regulation and control combined mode is adopted, and electromagnetic stirring phase difference control and cooperative control of a secondary cooling section (fan-shaped section) auxiliary ultrasonic vibrator are combined at the same time. Wherein the composite action mode of the longitudinal standing wave field and the transverse traveling wave field of the multidirectional focused ultrasonic wave field and the solidification front edge dynamic regulation and control mode act on the casting blank, so that the equiaxed crystal rate can be remarkably increased, and the combination of ultrasonic waves and electromagnetic stirring is beneficial to reducing the segregation degree of the casting blank; and the addition of nano aluminum oxide and magnesium oxide mixed particles in the casting powder is beneficial to improving sound wave conduction so as to reduce subcutaneous bubbles. The isometric crystal rate of the finally obtained continuous casting billet is increased to 30%-55%; the center segregation index of the finally obtained continuous casting billet is reduced to 1.05 or below; and the number of subcutaneous bubbles per square meter is less than 0.5.

The invention relates to a process for preparing a phosphor copper rod by using a phosphonate-amide composite purifying agent as a quenching aid, and belongs to the technical field of non-ferrous metallurgy. Phosphorus pentoxide and sodium carbonate are mixed and decocted into fused salt, the fused salt is cooled and ground and then added into a corundum crucible together with scrap copper to be rapidly heated, compressed air is blown in, and slagging-off is conducted after heat preservation and standing; blowing mixed gas into the melt for reduction refining; adding calcium boride into the melt for refining; the refined copper liquid is subjected to continuous casting and continuous rolling; rapidly immersing the phosphorus copper rod subjected to continuous casting and rolling into a quenching aid solution, and carrying out quenching treatment; and the quenched phosphor copper rod is blow-dried and dried, and the high-conductivity phosphor copper rod is obtained. The high-purity phosphorus copper rod prepared by the method is excellent in key indexes of copper content, phosphorus content and conductivity, and meets the expected requirements of high purity and high conductivity.

The invention relates to the technical field of ferrous metallurgy, in particular to a high-strength extremely-low-temperature welding material wire rod and a manufacturing method and application thereof.The manufacturing method comprises the steps that molten steel smelting is conducted according to chemical components and percentages of the high-strength extremely-low-temperature welding material wire rod, a square billet is manufactured in a forging and rolling mode after die casting, the square billet is heated and subjected to heat preservation for 4.5-6 h, and then the square billet is rolled into a first-diameter wire rod; cooling after rolling, uncoiling a wire rod, reducing the diameter from a first diameter to a second diameter through three times of drawing, annealing, reducing the diameter from the second diameter to a third diameter through three times of drawing after annealing, and finally performing finish drawing to a fourth diameter. The high-manganese steel liquid hydrogen storage tank welding material can be used for producing the high-manganese steel liquid hydrogen storage tank welding material, is matched with high-manganese steel welding and is good in forming, the content of Mn in formed weld metal is 24-28 wt%, the situation that due to large-range diffusion of the manganese element, the structure and performance near a fusion line are greatly different is avoided, and the extremely-low-temperature service mechanical performance of the weld metal is guaranteed.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a uniform slag adding device for a remelting electroslag furnace, which comprises a feeding device, the feeding device comprises a moving trolley, the top of the moving trolley is fixedly connected with a storage bin, the middle of the moving trolley is fixedly connected with a conveying pipe, and the conveying pipe intermittently rotates through a first rotating column; the expansion air bag gradually expands to exert pressure on the materials, a bridging structure formed by adhesion between the materials can be effectively damaged, meanwhile, the expansion air bag always keeps a certain expansion state within the interval period of the two times of inflation actions, the materials are continuously extruded, and therefore the materials can be continuously inflated. The continuous extrusion can prevent the materials from forming bridging again during the inflation interval, so that the bridging phenomenon is more effectively solved, smooth flowing of the materials is guaranteed, the problems of blockage and the like caused by bridging are avoided, the whole material conveying continuity is guaranteed, and the situation that feeding is uneven due to the bridging phenomenon is avoided.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for determining dissolution kinetics of solute in metallurgical slag based on molecular dynamics simulation, compared with a traditional experimental method, molecular dynamics simulation does not need a large number of thermal state experiments and complex detection modes, and large-scale simulation calculation can be rapidly completed on a computer. And meanwhile, various different conditions can be simulated in a short time, and superior processes and slag systems can be quickly screened out. According to the method, the reaction which is difficult to observe clearly can be visualized, the atomic trajectory behavior of the dissolution behavior, the dynamic change, the dispersion process of the solute and the like are provided, rich and accurate information is provided for research on dissolution kinetics, and the dissolution rule and the structure evolution mechanism of the solute in the high-temperature melt can be revealed. In addition, the method is high in safety, and danger possibly brought by a high-temperature experiment is avoided.

The invention discloses a production method for reducing flaw detection defects of wind power gear steel, and belongs to the technical field of ferrous metallurgy. According to the method, an electric furnace-LF-VD-continuous casting process route is adopted, the mass fraction of an aluminum element Al in molten steel is controlled to be not lower than 0.018% in the LF refining process, and the mass fraction of [Al] is controlled to be higher than 0.010% all the time in the VD vacuum treatment process. And after VD vacuum breaking, aluminum is supplemented in time, the mass fraction of Al is increased to 0.015%-0.020%, calcium treatment is reasonably carried out, and the mass fraction of Ca in molten steel is controlled to be 0.0006%-0.0009%. By accurately controlling the component change of the molten steel in the VD process, the formation of CaO-MgO-Al2O3-SiO2 inclusions with high SiO2 content is effectively inhibited, the large-size ultrasonic flaw detection defects in the wind power gear steel are remarkably reduced, and the internal quality of the steel is improved. The method is simple in process and remarkable in effect, and has a good industrial application prospect.

The invention discloses a method for refining and homogenizing crystal grains of a 9%-12% Cr steel thick-wall large forge piece, and belongs to the field of ferrous metallurgy. According to the method, the large forge piece is heated to be close to the critical point of the complete austenitizing temperature in a stepped mode, the large forge piece is subjected to heat treatment by regulating and controlling dispersive precipitation of carbides in an initial structure and uniform nucleation of austenite and / or introducing a small amount of undissolved ferrite, residual precipitated phases and multi-phase interfaces and controlling the cooling speed; nucleation particles of pearlite transformation in the vibration heat preservation process are remarkably increased, uniform distribution of granular pearlite in the supercooled austenite is promoted, structural inheritance is cut off and eliminated, and the purpose of grain refining and homogenizing after performance heat treatment is achieved. According to the method, the grains of the thick-wall large forge piece are refined to 5 grades or above, the cross section grain size difference is within 2 grades, a series of problems that in the production process, grass waves exist in ultrasonic flaw detection, the grain size is unqualified, and the low-temperature impact toughness does not reach the standard can be solved, the product percent of pass and the production efficiency are remarkably improved, and meanwhile the production energy consumption is reduced.

The invention provides a method for determining boron element in iron ore, which comprises the following steps: weighing 0.2 g of sample, uniformly mixing with a flux, heating to red at 700-800 DEG C, cooling, adding sodium peroxide for secondary melting, dissolving in water, and transferring to a beaker; adding ethanol to boil, fixing the volume to 500mL, filtering and taking 100mL, adjusting the pH value, adding hydrogen peroxide to slightly boil, cooling, adding barium carbonate to boil, diluting and filtering, and taking 25mL for color development determination. According to the method, sodium carbonate and / or potassium carbonate and sodium peroxide are adopted to form a composite flux, an iron ore sample is completely decomposed through secondary melting and step-by-step dissolution, and the sample decomposition efficiency is improved; the method is stable in recovery rate, is superior to a conventional method in precision, can accurately measure the boron content in the iron ore, meets the technical requirements on boron element detection in the fields of ferrous metallurgy, geological exploration and the like, provides an efficient and reliable detection means for boron content analysis, and ensures the accuracy and reproducibility of a detection result.

The invention belongs to the technical field of ferrous metallurgy and material modification, and particularly relates to a preparation method of green short-process hot work die steel, which comprises the following steps: obtaining scrap steel, adding alloy, and smelting to obtain molten steel; the molten steel is refined through fluoride-free rare earth refining slag, and refined molten steel is obtained; adding a nanoparticle modifier into the refined molten steel to obtain modified molten steel; and the modified molten steel is subjected to continuous casting or die casting, and the hot work die steel is obtained. According to the method, the fluorine-free rare earth slag refining and nano particle modification combined technology is adopted, fluorine-containing refining slag and traditional electroslag remelting are effectively replaced, power consumption and carbon emission in the smelting process are reduced, the technical development requirements of current green manufacturing and dual-carbon targets are met, and green short-process manufacturing of the hot work die steel is achieved; and the prepared hot work die steel has higher cleanliness, a more uniform organization structure and more excellent thermal fatigue performance.

The invention relates to a blast furnace gas main pipeline under-pressure plugging method, and belongs to the technical field of ferrous metallurgy in the metallurgical industry. According to the technical scheme, firstly, a small hole is formed in a point B in front of a leakage point C of the gas pipeline through a small tapping machine (1), and a balance pup joint (2) with a ball valve (10) is installed; secondly, opening a plugging hole at a point A before a point B of the gas pipeline by using a large tapping machine (3); thirdly, pushing a plugging head (14) and a rubber metal air bag (15) into the gas pipeline on the plugging hole by using a plugging machine (5); and fourthly, inflating the rubber metal air bag (15) to realize pressurized plugging of the gas pipeline, after the pressurized plugging of the gas pipeline, performing purging replacement on the gas pipeline behind the point B, and after the detection is qualified, using the point B as a monitoring point, and installing a gas detector (6) to perform real-time monitoring. The device has the beneficial effects that under the condition that blast furnace gas is not stopped, the gas is thoroughly cut off, and then the replacement and maintenance operation of the gas pipeline is completed.

The invention discloses a value-added utilization method and application of iron-containing fine impurities, and relates to the technical field of ferrous metallurgy. The method comprises the following steps: taking 10-30% by mass of iron-containing fine miscellaneous materials and 70-90% by mass of mixed coal powder as raw materials, additionally adding a composite additive which accounts for 13-27% of the total mass of the raw materials, and mixing, briquetting and carbonizing to obtain iron coke; wherein the composite additive is composed of asphalt and aluminum dihydrogen phosphate. The application is as follows: the iron coke obtained by adopting the method for value-added utilization of the iron-containing fine miscellaneous materials is used for blast furnace ironmaking, so that the coke ratio can be reduced, the smelting efficiency and the resource utilization rate can be improved, the production cost can be reduced, and the effects of energy conservation and emission reduction are achieved.

The invention discloses a multi-stage injection method for side-blown reinforced smelting of antimony concentrate, which relates to the technical field of non-ferrous metallurgy and comprises the following steps: a, a charging and preheating stage: conveying antimony concentrate, flux, fuel and other auxiliary materials into a smelting furnace, and injecting by adopting a low-speed and small-quantity gun; b, an intensified smelting stage: after charging is completed, executing when a large amount of materials are melted and main oxidation reaction occurs, and adopting high-speed and multi-gun collaborative injection; c, a stabilizing and refining stage: after the main oxidation reaction tends to be stable and the components of a molten pool tend to be stable, performing injection by adopting a medium-speed and decrement spray gun; and for each stage, preset and different injection parameter combinations are adopted. According to the method, the smelting process is divided into different stages, and the optimal injection parameter combination is matched for each stage, so that the comprehensive technical effects of improving the antimony direct recovery rate, reducing returned materials, reducing energy consumption and prolonging the service life of a furnace lining are achieved.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for inhibiting splashing in the smelting process of a high-scrap-ratio converter. The method comprises the following steps: (1) residue remaining and charging: the residue remaining amount is 20-30kg / t; loading scrap steel and molten iron, and controlling the scrap steel ratio to be greater than or equal to 25 And (2) converter blowing: realizing accurate intervention on the reaction process of the molten pool by optimizing cooperative control of an oxygen supply system and a slagging system. The method is used under the high scrap ratio smelting condition, the oxygen supply system and the slagging system are tightly coupled, the whole blowing process is more stable through cooperative control, and splashing is fundamentally inhibited.

The application provides a method for separating selenium tellurium from high-selenium tellurium dioxide through multistage conversion, and belongs to the technical field of non-ferrous metallurgy. The method comprises the following steps: a, material preparation; b, primary conversion leaching: selectively reducing selenium in a solution containing a reducing agent at pH 8-11 to obtain a selenium tellurium-containing residue and a primary leaching solution; c, secondary conversion leaching: selectively leaching tellurium in a strong alkaline solution containing a reducing agent to obtain elemental selenium and a secondary leaching solution; and d, neutralization treatment: combining the two leaching solutions and adding acid to obtain high-purity tellurium dioxide. The method is simple to operate, short in production cycle, and realizes efficient separation of selenium tellurium. The purity of the obtained elemental selenium is greater than or equal to 95%, the purity of the obtained tellurium dioxide meets the requirements of electrodeposition for producing 4N tellurium, and the method is suitable for large-scale production.

The invention belongs to the technical field of ferrous metallurgy, and relates to a reducing gas heating system and process for hydrogen metallurgy, the system comprises a heating furnace, a hydrogen-based shaft furnace, a decarburization device and gas connecting pipelines among the devices; the heating furnace is used for preheating reducing gas and supplying the reducing gas to the hydrogen-based shaft furnace; reaction gas generated by the hydrogen-based shaft furnace is decarbonized by a decarbonization device to generate reducing gas and decarbonized tail gas; a burner is arranged on the heating furnace and is respectively connected with decarburized tail gas, reaction gas and an external gas pipe; a decarburized tail gas preheater is arranged on a smoke exhaust pipe of the heating furnace; an outlet of the decarburized tail gas main pipe is respectively connected with a decarburized tail gas diffusing pipe and a decarburized tail gas burner supply pipe; a reducing gas pipeline is connected with the heating furnace; the decarburization tail gas burner supply pipe is connected with the decarburization tail gas preheater, and the preheated decarburization tail gas is supplied to a burner of the heating furnace. The byproduct gas in the hydrogen metallurgy process is fully utilized as the fuel of the heating furnace, the energy utilization efficiency is effectively improved, and the production cost is reduced.

The present application relates to non-ferrous metallurgy and energy-saving and environment-protecting technical field, specifically relates to a copper electrolytic refining heat preservation-cooling-heat energy recycling integrated energy-saving system, central control unit is respectively connected with electrolytic cell composite heat preservation module, electrolyte intelligent cooling module, heat energy recycling module electricity, tank body heat preservation assembly is arranged on the outer wall of electrolytic cell, the tank surface sealing heat preservation assembly covers on the electrolytic cell liquid surface, circulating tank cooling assembly is communicated with electrolyte circulating pipeline of electrolytic cell, temperature monitoring unit is arranged in electrolyte circulating pipeline and circulating tank, heat energy recycling module includes heat energy capture assembly, heat energy transmission assembly and heat energy reuse assembly, heat energy transmission assembly is connected with heat energy capture assembly and heat energy reuse assembly respectively, the present application realizes the automation dynamic balance control of heat preservation-cooling-heating, controls electrolyte temperature fluctuation in a small range, effectively guarantees the crystallization quality of cathode copper.

The invention discloses a metallurgical process endpoint quality prediction method based on an FO-FTTransform deep network. The method comprises the following steps: collecting historical production data of a converter smelting process; based on the converter metallurgy mechanism and expert experience, variable selection is carried out in combination with a random forest algorithm; preprocessing data and constructing a sample data set; the method comprises the following steps: constructing an FO-FT block by adopting a TE block and an NE block which are parallel to each other; the method comprises the following steps: carrying out coding layer reconstruction and decoding layer replacement on a traditional FT-Transform to obtain an improved Transform; constructing an initial prediction model suitable for metallurgical process end point quality prediction, and training to obtain a metallurgical process end point quality prediction model; and collecting the ferrous metallurgy report as input data, performing prediction, and outputting a prediction result. The method accurately adapts to the prediction requirement of the converter steelmaking process, and high-precision prediction of the final temperature and the mass components of the converter can be achieved.

The invention discloses a method for recycling filter cakes of an aluminum oxide leaf filter produced from imported guinea ores, relates to the technical field of nonferrous metallurgical aluminum oxide production, and solves the problems of high energy consumption, easiness in blockage, short service life of filter cloth, incomplete solid-liquid separation recovery and low efficiency in a filter pressing process. The method comprises the following steps: a recycling process comprises the following steps: carrying out size mixing pretreatment on a low-solid-content filter cake generated by a leaf filter, feeding the low-solid-content filter cake into a settling tank, carrying out deep cone settling so as to carry out solid-liquid separation, and returning the separated supernatant to a rear dilution tank; and the underflow of the settling tank for solid-liquid separation is subjected to spiral dehydration and mother liquor blending and then returns to an aluminum oxide dissolution system. The solid content and Nk concentration of the filter cake can be automatically controlled and flexibly adjusted, and stable separation under high-temperature ore pulp is achieved; goethite blockage can be avoided, continuous operation is guaranteed, and the annual failure rate is smaller than 5%; the solid recovery rate is greater than or equal to 95%, the filtrate is circulated after reaching the standard, and the filter cake recovery operation cost is effectively reduced by greater than or equal to 30%.

A flue gas double-cyclone type low-nitrogen aluminum melting furnace comprises a left burner, a right burner, a left cyclone, a right cyclone, a communicating pipe and an injection pipe. A left branch pipe on the communicating pipe extends into a four-way valve smoke exhaust pipe, a bypass fan sucks low-temperature smoke, divides the low-temperature smoke into two parts and then tangentially feeds the low-temperature smoke into a left cyclone gas collecting pipe and a right cyclone gas collecting pipe, the low-temperature smoke is divided into three parts by the gas collecting pipe and then fed into three air channels distributed in an annular array mode, and the three air channels feed the low-temperature smoke into the throat section in the mode that the three air channels are tangent to the hypothetical cylindrical face of the throat section. Low-temperature flue gas in the two throat sections swirls at a high speed and is mixed into high-temperature air flow and high-temperature flue gas flow respectively. The injection pipe is arranged in the furnace wall, the central axis of the injection pipe perpendicularly intersects with the central axis of the throat section of the combustor, and high-temperature low-oxygen smoke of the right combustor is injected to high-temperature normal-oxygen air of the left combustor. The heat preservation device can be used for waste aluminum, aluminum ingot and aluminum alloy smelting and refining in the nonferrous metallurgy field. The aluminum material can be rapidly melted, fuel gas is saved by 30-50%, the smoke exhaust temperature is lower than 180 DEG C, and the NOx emission is smaller than or equal to 50 mg / m < 3 >.

The invention discloses steel for a hydrogen transmission pipeline and a production method of the steel, and belongs to the technical field of ferrous metallurgy, the steel comprises the following chemical components in percentage by mass: 0.03%-0.05% of C, 0.15%-0.35% of Si, 0.7%-1.30% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0010% of S, 0.010%-0.030% of Nb, 0.035%-0.055% of V, 0.008%-0.030% of Ti, 0.15%-0.35% of Cr, 0.30%-0.50% of Ni, 0.050%-0.150% of Mo, 0.10%-0.20% of Cu, 0.010%-0.050% of Al, less than or equal to 0.00050% of B, less than or equal to 0.0060% of N, less than or equal to 0.0002% of According to the production method, high-purity low-carbon phosphorus-sulfur molten steel is obtained through a converter, refining and continuous casting, alloy steel mainly comprising acicular ferrite is obtained through a hot mechanical rolling technology, and the hydrogen conveying requirement of products is met.

This invention relates to the field of ferrous metallurgy technology and discloses a method for the reduction production of high-purity, low-oxygen-content sponge iron. The method includes: feeding pellets and reducing materials into a rotary kiln for preheating and forming a metallic iron shell on the surface; pulse-injecting a composite reducing liquid into a high-temperature solid-phase bed in a deep reduction zone; using a rotary encoder for feedback to perform dynamic phase-controlled injection, achieving gas-liquid linkage control and nitrogen cooling maintenance; and collecting the finished product through end-stage homogenization, cooling, and magnetic separation. Ammonia gas generated by the pyrolysis of the composite reducing liquid penetrates the metal layer for deep reduction, and a chemical shielding layer is constructed using boron-carbon bonds formed on the microporous surface of the iron matrix. This invention effectively improves the metallization rate of sponge iron, significantly inhibits secondary oxidation of the finished product during kiln exit and storage, and solves the technical problem of high and unstable residual oxygen content in sponge iron.

The application discloses a kind of based on AI's core energy storage collaborative intelligent smelting and power generation technical method and its operation management system, it is related to industrial energy comprehensive utilization technical field.The application is by being changed into energy storage body to smelting furnace, incinerator, steam boiler, and is combined with unique core tank structure, realize the efficient storage of wind energy, solar energy, biomass energy and industrial waste heat;Through end-edge-cloud three-level AI management platform, dynamically allocate energy input path, intelligent switch smelting, power generation, peak shaving three heat release modes, form collection-storage-conversion-usage closed loop.The application makes energy storage power station construction cost drop 80%, energy utilization efficiency is promoted to more than 85%, grid peak shaving response time is less than or equal to 1 second, smelting energy consumption is reduced by 25%-30%, investment recovery period is shortened to 3-5 years, solve renewable energy and industrial waste heat difficult to store, energy storage power station cost is high, grid peak shaving is difficult and other pain points, applicable to steel, non-ferrous metallurgy and industrial park and other multiple scenes.

The invention relates to a monitoring device and method for preventing an LF refining furnace electrode from being fractured, and belongs to the technical field of ferrous metallurgy devices and methods. According to the technical scheme, an electrode insertion hole (1) is formed in a small refractory furnace cover (2), an electrode (4) penetrates through the small refractory furnace cover (2) through the electrode insertion hole (1), a transformer (5) is connected with the electrode (4), the input end of a control system (6) is connected with the transformer (5), the output end of the control system (6) is connected with a hydraulic system (7), and the hydraulic system (7) controls the electrode (4). The method has the beneficial effects that production interruption or unqualified product quality caused by electrode breakdown and breakage due to the fact that accumulated slag is not cleaned in time is avoided; accurate accumulated slag cleaning operation can be achieved in the LF furnace production process, frequent accumulated slag cleaning operation of field operators is avoided, and the cleaning workload is reduced.

The invention relates to the field of ferrous metallurgy and high-temperature material engineering, in particular to a preparation method and application of a silicon steel annealing furnace roller surface coating based on a double-hollow graphite electrode plasma arc melting diamond-graphite composite coating. A current loop is formed, so that plasma arcs are generated between the electrodes; diamond powder, graphite powder and modified zirconium oxide powder are mixed, nickel-based self-fluxing alloy powder is added, and mixed powder is obtained; argon serves as carrier gas, and the mixed powder is fed into a plasma arc area through a double-hollow graphite electrode; the surfaces of the mixed powder particles are activated and are metallurgically bonded with the surface of a partially molten roller base material by utilizing high temperature and high energy generated by a plasma arc, and a diamond-graphite composite coating is formed on the surface of the roller in a cladding manner; and carrying out post-treatment on the diamond-graphite composite coating according to requirements.

The application discloses a method and system for producing alumina by using aluminum-rich coal gangue, and belongs to the field of secondary resource quality utilization and non-ferrous metallurgy. The method comprises the following steps: crushing and screening aluminum-rich coal gangue raw materials to obtain aluminum-rich coal gangue powder; pyrolyzing the aluminum-rich coal gangue powder under the carrying of hot air to obtain pyrolysis materials; performing first separation on the pyrolysis materials to obtain a high-temperature oil-gas mixture and a solid product; performing an activation reaction on the solid product under the carrying of carrying gas to obtain calcined aluminum-rich coal gangue; performing second separation on the calcined aluminum-rich coal gangue to obtain reaction tail gas and high-temperature active silicon-aluminum oxide; performing heat exchange and cooling on the high-temperature active silicon-aluminum oxide to obtain cooled active silicon-aluminum oxide; performing pre-desiliconization treatment on the cooled active silicon-aluminum oxide to obtain a treated product; and extracting aluminum from the treated product to obtain alumina. The method has the advantages of simple process, low energy consumption, reasonable utilization of energy, high extraction rate, reduced cost, and large-scale industrial application.

The invention relates to the technical field of non-ferrous metallurgy, in particular to a molybdenum concentrate oxygen-enriched roasting method and a roasted product, and in the method, corresponding oxygen-enriched air is input by adopting a segmented oxygen control strategy in each stage. According to the method, a segmented oxygen control strategy is designed, in the original multi-hearth furnace molybdenum concentrate oxidizing roasting process, rich oxygen is increased in roasting furnace layers, the dynamic oxygen content in the furnace layers is increased, the total amount of oxygen participating in an oxidizing reaction in roasting atmospheres in all the furnace layers is overall increased, the oxygen-rich atmospheres are manufactured in all the roasting furnace layers, and the oxidizing desulfurization rate of materials is overall increased; therefore, accurate distribution of oxygen is achieved, the oxygen utilization rate is increased, and the thermal load and energy consumption of equipment are reduced.

This invention belongs to the field of non-ferrous metallurgy and hazardous waste treatment technology, proposing a method for reducing arsenic content using a synergistic hydrothermal reaction of low-grade lead-zinc ore and polluted acid. The method involves pre-decalcifying the low-grade lead-zinc ore with dilute hydrochloric acid to remove interfering calcium carbonate. Then, by controlling the mass ratio of active metals such as Pb, Zn, and Fe in the ore powder to As in the polluted acid, under specific hydrothermal conditions, the in-situ release and induced precipitation of metal ions within the ore are stimulated, constructing thermodynamically extremely stable onionite and onionite-like mineral phases. The arsenic removal rate of this invention is consistently above 95%, and the stability of the arsenic-fixed products far exceeds national hazardous waste landfill standards. This method not only solves the problem of arsenic pollution from polluted acid but also simultaneously realizes the resource utilization of low-grade ore, demonstrating significant environmental and economic benefits.

The invention relates to a high-end automobile sheet product casting blank quality judgment method, and belongs to the technical field of ferrous metallurgy continuous casting production methods. According to the technical scheme, liquid level fluctuation judgment, heat flow ratio judgment, constant pulling speed judgment and secondary cooling water judgment are carried out, and grade subdivision is carried out; and based on the weight difference of different quality indexes of the high-strength automobile sheet, setting the weight of each dimension, calculating a comprehensive score, and mapping the comprehensive score into a final quality grade. The method has the beneficial effects that through a three-layer framework of'single-dimensional accurate judgment-multi-dimensional weight collaboration-comprehensive grade mapping ', accurate control over the quality of the high-strength automobile sheet casting blank is achieved, and four core dimensions of liquid level fluctuation, a heat flow ratio and secondary cooling water are covered; a refined grading standard is established to adapt to the quality requirements of different parts of the high-strength automobile sheet; and multi-dimensional collaborative judgment logic is constructed, so that misjudgment of a single index is avoided, and the judgment accuracy is improved.

The invention discloses a novel perforating machine guide plate positioning device, and relates to the technical field of ferrous metallurgy. Comprising a base, a buffering structure is fixedly connected to the top of the base, fixing structures are symmetrically and fixedly connected to the top of the buffering structure through bolts, the buffering structure comprises a damper, a supporting structure is fixedly connected to the top of the damper, and buffering springs are symmetrically and fixedly connected to the bottom of the supporting structure; the stabilizing plates are symmetrically and slidably connected to the inner wall of the supporting structure, the dampers penetrate through the buffer springs, the buffer springs generate elastic deformation after being vibrated to preliminarily absorb vibration energy, the dampers synchronously play a damping role to slow down the springback speed of the springs, resonance is avoided from the source, and the damping effect is improved. The problem of positioning deviation caused by direct vibration transmission of an existing rigid supporting structure is thoroughly solved. And meanwhile, the radial deviation of the supporting structure can be limited.

The utility model discloses a rocking-turn type steel slag cooling granulator, which relates to the technical field of energy conservation and environmental protection in the ferrous metallurgy industry, and comprises a rocking-turn roller, the rocking-turn roller comprises a steel slag treatment section, the two ends of the steel slag treatment section are fixedly connected with roller supporting sections, the outer side of the steel slag treatment section is provided with a steel slag material port, and the steel slag material port is connected with the roller supporting sections. A plurality of kick-out devices are arranged in the steel slag treatment section, and the outer surface of the roller supporting section is fixedly connected with a roller body supporting ring and a roller body transmission wheel. By the adoption of the structure, water does not need to be pumped in the steel slag treatment process, cooling and granulation of high-temperature molten steel slag are achieved through circulating cooling air and external circulating cooling water, and waste heat resources, absorbed by the cooling air and the cooling water, of the molten steel slag can be recycled through an external waste heat boiler and other processes; the cooling water pipe bundle is arranged externally, so that leakage caused by abrasion of the membrane wall structure roller is avoided, and the problems of gas explosion and the like caused by water jacket blockage of a jacket type roller are avoided.