389 results about "Refining (metallurgy)" patented technology

The invention relates to the technical field of ferrous metallurgy, in particular to a production and manufacturing method of a low-cost high-elongation 600MPa-grade steel plate, which is characterized in that raw materials comprise the following chemical components in percentage by weight: 0.111 to 0.173 percent of C, 0.13 to 0.43 percent of Si, 1.325 to 1.565 percent of Mn, less than or equal to 0.018 percent of P, less than or equal to 0.008 percent of S, 0.020 to 0.060 percent of Alt, 0.0225 to 0.0435 percent of Nb, less than or equal to 0.0070 percent of N and the balance of Fe; the manufacturing method comprises the following steps of top-bottom combined blown converter, LF refining, VD vacuum refining, slab continuous casting, two-stage controlled rolling and subsection cooling.

The present application relates to the technical field of metallurgy, and particularly relates to a production method of a large-wall-thickness pipeline steel with improved carbon dioxide corrosion resistance and strength and toughness, and specific measures include: (1) controlling the bottom blowing mode and end point requirement in the converter process; (2) controlling the tapping time and replacing the tapping hole opportunity in the tapping process; (3) feeding the CAS aluminum wire and controlling the CAS argon blowing time; (4) controlling the top slag addition amount, heating time and outgoing mode in the LF refining process; (5) controlling the wire feeding parameters, soft blowing time and outgoing requirement of RH in the RH refining process; (6) controlling the precision requirement, casting speed fluctuation and crystallizer liquid level fluctuation of the continuous casting equipment in the continuous casting process to obtain the casting blank. Through controlling the parameters of each process in the smelting and rolling process, the present application realizes the whole-process steel cleanliness control and ladle grain refinement, and further improves the strength, low-temperature toughness, HIC resistance and carbon dioxide corrosion resistance of the large-wall-thickness pipeline steel.

The invention belongs to the technical field of metallurgy, and particularly relates to ultrapure 316L stainless steel and a vacuum induction melting preparation method thereof. The preparation method comprises the following steps: firstly preparing NiCa intermediate alloy through vacuum induction melting, then preparing 316L alloy through vacuum induction melting, firstly adding Al for deoxidation, then adding the refined NiCa intermediate alloy for high-temperature refining for Al removal, and finally performing low-temperature refining for Ca removal and further deep deoxidation and desulfurization. According to the method, various impurity elements such as Al, O and S and inclusions of the ultra-pure 316L stainless steel can be removed only through a vacuum induction melting method, extra technological processes such as electroslag or self consumption are not needed, equipment investment is simple and convenient, large-scale industrial application can be achieved easily, and an effective way is provided for purification preparation of the ultra-pure 316L stainless steel.

The invention provides a method for removing trace impurity elements from high-purity rubidium salt, which belongs to the technical field of metallurgy and comprises the following steps: dissolving the high-purity rubidium salt with deionized water to obtain a high-purity rubidium salt solution; adding a precipitator into the high-purity rubidium salt solution to carry out selective precipitation reaction of rubidium to obtain a rubidium-containing precipitation product, and preliminarily removing impurity elements such as sodium, potassium and cesium; the rubidium-containing precipitation product is filtered and then subjected to roasting treatment, the rubidium-containing precipitation product is subjected to a decomposition reaction, and a roasted product is obtained; an acidic transformation agent is added into the roasted product for a transformation reaction, and a rubidium salt solution is obtained; impurity elements such as sodium, potassium and cesium in the product are further removed through a recrystallization refining method, and the rubidium salt product with the purity reaching 99.9% or above is obtained. The method can effectively remove trace impurity elements in the high-purity rubidium salt, and has the advantages of short flow, few procedures and high product purity.

The invention discloses a method for cascade recovery of tellurium from a complex tellurium-containing material. The method comprises the steps of acid pickling, reduction neutralization, pyrogenic transformation, leaching and neutralization. According to the method, through cooperative treatment of a wet process and a pyrogenic process, the problem of slag phase wrapping is effectively solved, and tellurium with different valence states in a complex tellurium-containing material is converted into high-quality tellurium neutralization slag in a gradient mode. The selenium removal rate is not lower than 95%, the tellurium recovery rate reaches up to 90% or above, efficient separation of selenium and tellurium is achieved, and the produced tellurium dioxide neutralization slag can be used for further purification and refining.

The invention relates to the technical field of ferrous metallurgy, in particular to a smelting method for silicon deoxidation of low-carbon low-silicon aluminum killed steel. The method comprises a converter, an alloy fine adjustment station, RH refining and continuous casting. A strong bottom blowing mode is adopted in the later stage of converter blowing, and high-carbon ferromanganese, a ferrosilicon deoxidizing agent and lime are sequentially added during tapping; and after temperature measurement and sampling in the alloy fine tuning station, the steel ladle is transported to RH refining. And the RH executes different treatment modes according to Si and C components of the alloy fine tuning station, such as oxygen blowing decarburization and desilicication, direct aluminum particle addition alloying or vacuum reserved oxygen decarburization and the like. Through cooperation of silicon pre-deoxidation and aluminum final deoxidation, the oxygen content of RH entering molten steel and consumption of an aluminum deoxidizing agent are reduced, and the cleanliness of the molten steel is improved; different treatment modes shorten the treatment period, reduce the final temperature of the converter, meet the low-carbon and low-silicon requirements, reduce the production cost and improve the production efficiency.

The invention belongs to the technical field of ferrous metallurgy, particularly relates to a method for determining the LF refining slag amount of ultralow-sulfur pipeline steel, provides a molten iron-free pretreatment-single slag method ultralow-sulfur pipeline steel production process, and establishes an optimal refining slag system of the ultralow-sulfur pipeline steel. According to the method, the sulfur capacity of a refining slag system is calculated through a KTH model, the sulfur distribution ratio of the refining slag is further obtained by combining current molten steel components, the theoretical adding amount of the refining slag is accurately obtained according to the requirements of the sulfur distribution ratio, the molten steel amount, the LF refining station entering sulfur content and the LF refining station exiting sulfur content, and a refining slag amount rapid calculation model based on LF station entering sulfur content classification is provided. And when the sulfur content of the entering molten steel is less than or equal to 0.030 wt%, the optimal desulfurization efficiency of the LF is ensured based on the LF slag system optimization and accurate slag quantity control technology, stable production of the ultra-low sulfur steel can be realized under the condition of no molten iron pretreatment, and the sulfur content of a finished product is controlled within 10ppm.

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 belongs to the field of ferrous metallurgy, and discloses an RH refining oxygen blowing decarburization method which comprises the following steps: dynamically adjusting the oxygen blowing flow and the oxygen blowing lance position according to the ratio of the content of carbon to the content of oxygen in RH incoming steel; the oxygen blowing amount is determined according to the initial values of the carbon and oxygen contents in the RH entering steel and the target values of the carbon and oxygen contents after decarburization is finished; a gradient lifting gas flow system is adopted in the RH decarburization process, the oxygen blowing opportunity of RH decarburization and the vacuum pressure in the oxygen blowing process are controlled, and when RH decarburization is finished, molten steel is controlled to be low in oxygen activity. According to different RH entering molten steel components, the oxygen blowing flow and the oxygen blowing lance position are dynamically adjusted, the gradient gas flow increasing system is adopted, the RH decarburization oxygen blowing opportunity, the oxygen blowing process vacuum pressure and decarburization ending molten steel oxygen activity control are combined, the oxygen utilization rate can be effectively increased, the decarburization period is shortened, and the decarburization efficiency is improved. The problem of molten steel recarburization caused by molten steel splashing due to too violent carbon-oxygen reaction is solved, RH efficient decarburization is achieved, the steel ladle top slag oxidability is reduced, and the molten steel cleanliness is improved.

The invention relates to the technical field of metallurgy and chemical industry, in particular to a silicon-manganese alloy smelting method which comprises the following steps of raw material pretreatment, gradient reduction smelting, tapping and refining and flue gas slag cooperative treatment. In the silicon-manganese alloy smelting process, lanthanum-cerium oxide in the rare earth composite material reacts with impurities such as sulfur, phosphorus and oxygen in a melt at high temperature to form a high-melting-point compound which is separated along with slag, the impurity content is effectively reduced, meanwhile, rare earth elements are segregated at the grain boundary, atomic diffusion migration is inhibited, the alloy grain size is remarkably refined, and the alloy yield is improved. And the rare earth composite material optimizes the alloy solidification structure through the double effects of chemical purification and physical modification, the problems of impurity segregation and insufficient toughness in the traditional silicon-manganese alloy smelting process are solved, and the mechanical property of the silicon-manganese alloy is remarkably improved.

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 discloses a technological method for regulating and controlling the melting point and viscosity of aluminum deoxidized steel refining slag based on rare earth cerium, and belongs to the technical field of ferrous metallurgy refining. The redox characteristic of Ce and slag system structure modification are combined, the limitation of traditional single component adjustment is broken through, and the composite oxide effect of Ce is utilized: Ce generates CeO2 and Ce-Al-O composite oxide at high temperature, so that the liquidus temperature of a slag system is remarkably reduced, and the melt structure is optimized; by limiting the addition amount of Ce and balancing the cost and performance, the situation that the oxidability of a slag system is out of control due to excessive Ce is avoided, and the thermodynamic stability of the slag system is improved; the addition of Ce inhibits the generation of high-melting-point calcium aluminate and promotes the formation of a low-melting-point phase; by adding Ce, melting point reduction, viscosity optimization and molten steel purification are achieved at the same time, the additive is superior to an existing single-function additive, traditional fluorite is replaced, and fluorine pollution is reduced. The invention aims to provide the same environment-friendly and efficient method capable of accurately regulating and controlling the physicochemical properties of the slag.

The present application provides a full-process intelligent refining system applied to an LF refining furnace, which relates to the field of iron and steel metallurgy and includes: a slag-making control module that calculates the addition amount of slag-making agent; a temperature prediction module that predicts and controls the molten steel temperature in real time; a blowing argon control module that establishes a relationship model between the exposed area of molten steel and the bottom blowing argon gas flow rate; a wire feeding prediction module that calculates the feeding amounts of aluminum wire and calcium wire; an alloy calculation module that automatically controls the alloy addition amount; a machine-assisted module that collects data and performs sampling and slag sticking work; a main control module that is used to control the system operation; and a server for data storage and interaction. The present application uses technologies such as statistical methods and mechanism calculations to establish mechanism models for each refining process, predict and automatically control the refining process, effectively improving the hit rate of alloy components and the temperature compliance rate, and at the same time reducing alloy consumption and power consumption.

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a production method of low-silicon sulfur-added high-aluminum gear steel which comprises the following chemical components in percentage by weight: 0.15%-0.20% of C, 0.06%-0.12% of Si, 1.35%-1.55% of Mn, 0.035%-0.055% of S, 1.10%-1.20% of Cr, 0.035%-0.055% of Al, 0.012%-0.016% of N, less than or equal to 0.0010% of O and the balance of Fe and inevitable residual elements. The overall process route of the production method comprises the steps of converter primary smelting, tapping pre-calcification and sulfurization, LF refining slagging, RH vacuum treatment and continuous casting protection pouring. By optimizing the composition of the refining slag, controlling the sulfur content in stages and co-processing calcium and aluminum, the continuous casting castability problem of the low-silicon sulfur-added high-aluminum gear steel is effectively solved, and the liquid level fluctuation percent of pass of a crystallizer is greater than 99%.

The invention relates to a method for preparing rare earth steel by refining prefabricated slag of a CaO-Al2O3-REO-MgO slag system, belongs to the technical field of ferrous metallurgy, and solves the technical problem of how to prepare the rare earth steel by refining the prefabricated slag of the CaO-Al2O3-REO-MgO slag system so as to improve the rare earth yield. The invention discloses a method for refining and preparing rare earth steel by using prefabricated slag of a CaO-Al2O3-REO-MgO slag system. The method comprises the following steps: S1, paving a deoxidizing agent, the prefabricated slag and lime at the bottom of a steel ladle before tapping, and tapping; s2, slag adjustment operation of the LF furnace; step S3, alloying is carried out; s4, treating white slag for more than or equal to 20 minutes, and performing calcium treatment; s5, argon blowing is carried out, and an LF furnace station is left; s6, RH treatment is carried out; s7, adding a rare earth iron alloy; s8, vacuum breaking is carried out after vacuum circulation, and the robot leaves the RH station; s9, a tundish covering agent is scattered on the surface of the molten steel; and S10, the surface of the molten steel is protected through continuous casting crystallizer casting powder. The yield of the rare earth elements is 40% or above.

The invention relates to an RH vacuum tank system and a combustion heating operation method, and belongs to the field of ferrous metallurgy vacuum treatment equipment. The system comprises a vacuum tank, a hot bent pipe, a top lance device, a vacuum air pump system and an automatic control system, the hot bent pipe is connected with the vacuum tank, and an automatic ignition device, an infrared temperature measuring device, a video monitoring device and a thermocouple are integrated in the hot bent pipe; the top lance device is of a water-cooling multi-layer sleeve structure, multiple stations are switched through a top lance rotating frame and a lifting trolley, and vacuum sealing is maintained. The method is based on multi-sensor cooperative control, low-temperature ignition, high-temperature spontaneous combustion and molten steel heating modes are automatically executed according to the temperature of a refractory material at the bottom of a tank and the temperature of molten steel, and combustion stability is ensured by dynamically adjusting the flow of fuel gas and oxygen. According to the scheme, through closed-loop ignition control, inert gas protection and intelligent monitoring, the safety is remarkably improved, and the gas explosion risk is avoided; full-automatic operation and precise temperature control are combined, the molten steel quality and the production efficiency are improved, and the device is suitable for refining production of high-value-added steel such as silicon steel and automobile sheets.

The invention relates to a preparation method of ultralow-carbon ultralow-sulfur low-nitrogen steel, and belongs to the technical field of ferrous metallurgy. The method comprises the following steps: smelting a raw material containing waste steel in an electric furnace to obtain first molten steel; the first molten steel is subjected to sectional type LF refining, and second molten steel with the preset sulfur content is obtained; wherein the sectional type LF refining comprises LF refining of a light desulfurization section, a slagging-off section and a deep desulfurization section for spraying calcium oxide powder which are arranged in sequence, and the temperature of the first molten steel in the light desulfurization section is controlled; and the second molten steel is subjected to RH vacuum smelting, decarburization and denitrification are conducted, oxygen blowing operation is conducted in the RH vacuum smelting process, and the ultralow-carbon ultralow-sulfur low-nitrogen molten steel is obtained. The ultralow-carbon ultralow-sulfur low-nitrogen molten steel is prepared from the following components in percentage by mass: less than 20 ppm of oxygen, less than 0.0030% of nitrogen, less than 0.0030% of sulfur and less than 0.0020% of carbon.

The invention discloses a ladle refining furnace and a method for reducing electrode consumption in the molten steel refining and smelting process, and belongs to the technical field of metallurgy. The ladle refining furnace comprises an electrode clamp and a gas blowing device arranged below the electrode clamp. According to the gas injection device of the ladle refining furnace, the gas wall is formed below the electrode to prevent the air from being in contact with the electrode, so that the electrode consumption in the molten steel refining and smelting process is reduced. Moreover, when the ladle refining furnace is used for refining and smelting the molten steel, the process is simple and easy to operate, the overall cost is remarkably reduced, and the ladle refining furnace is suitable for large-scale industrial production. In addition, the method solves the problems of high electrode consumption and short service life in the refining process caused by serious air oxidation after the electrode is electrified in the molten steel refining and smelting process, reduces the oxygen concentration on the surface of a steel ladle after refining and smelting, reduces the oxygen uptake in the slag forming process, and improves the molten steel quality.

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 provides a refining method, a metallurgical device and a refining system for platinum group metal lean ore, and relates to the technical field of microwave metallurgy. The refining method comprises the following steps: heating and homogenizing platinum group metal mineral powder through microwave radiation to obtain microwave homogenized mineral powder; carrying out microwave smelting on the microwave homogenized mineral powder to obtain a smelting product; and the smelting product is sequentially subjected to a first-stage separation and enrichment process, blowing treatment and a second-stage separation and enrichment process, and the high-nickel matte is obtained. According to the refining method for the lean ore of the platinum group metal, the ore reaction activity and the energy utilization rate are remarkably improved, the energy consumption is reduced, the refining time is shortened, the platinum group metal recovery rate is increased, meanwhile, SO2 emission is reduced, the production cost is reduced, and the advantages of being efficient, energy-saving and environmentally friendly are achieved.

The invention provides a method for preparing 6N-grade high-purity nickel through multistage electrochemical refining, and belongs to the technical field of non-ferrous metal hydrometallurgy. According to the method, under the ultra-clean environment, the ultra-pure raw materials and the pulse electrodeposition technology are used, impurity precipitation is effectively inhibited, deposition layer growth kinetics is optimized, through multi-stage linkage, parameter collaboration and whole-process quality control, the problems that according to a traditional electrolytic method, impurity removal is not thorough, and the cathode deposition morphology is poor are effectively solved, and the method is suitable for industrial production. Limit purification and compact deposition are achieved, and a 6N-grade high-purity nickel cathode product with the smooth surface like a mirror and the compact and defect-free structure can be stably and efficiently obtained. The result of the embodiment shows that the purity of the high-purity nickel obtained through the method is larger than 99.9999%, and the standard of 6N-grade high-purity nickel is met.

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 discloses a purification method of high-purity tellurium, and belongs to the technical field of non-ferrous metallurgy. The method sequentially comprises the steps of raw material ultrasonic mechanical activation, ultrasonic selective recrystallization, smelting reduction refining, vacuum rectification purification and tellurium ingot forming, and volatile impurities such as selenium and sulfur are effectively removed by oxidizing calcination of a crude tellurium raw material; then, primary separation of impurities is realized in a manner of combining alkaline dissolution and oxidation precipitation, and then repeated purification is performed through low-temperature crystallization, so that the purity of tellurium is remarkably improved; metal impurities are further removed through smelting reduction treatment under the inert atmosphere, and preliminarily purified tellurium ingots are formed; step distillation separation is carried out by utilizing vapor pressure difference between tellurium and impurities under a high vacuum condition, and a pure tellurium component is enriched; and finally, melting in an inert atmosphere, cooling and forming to obtain the high-purity tellurium ingot. The method is stable in technological process, suitable for industrial application and capable of meeting the requirements of high-end fields such as semiconductors and photoelectric materials for high-purity tellurium materials.

The invention relates to the technical field of metal refining and powder metallurgy, and discloses a method for reducing high-grade iron powder through low-grade red mud powder and fly ash and application of the method. The method comprises the following steps that S1, the red mud powder and the fly ash are selected as raw materials, the mass fraction of iron in the red mud powder ranges from 10% to 30%, and the fly ash contains iron oxide; the mass ratio of the red mud powder to the fly ash is (100: 10)-(100: 90); s2, the red mud powder and the fly ash are evenly mixed according to the mass ratio, and pellets with the diameter being 5-16 mm are formed through pelletizing; and S3, the pellets are fed into a high-temperature reduction furnace. By adopting an accurate drying process, an atmosphere control technology and a particle size optimization and compaction technology, water content control, oxidation reaction inhibition and improvement of particle size uniformity and density consistency of the iron powder are realized, the stability, purity and fluidity of the iron powder are remarkably improved, oxidation loss in production and transportation is reduced, and the production cost is reduced. And high quality and reliability of a final product are ensured.

The invention belongs to the technical field of metallurgy, and particularly relates to a long-casting-time production method of food-grade tinplate. The tinplate comprises the following chemical components in percentage by mass: 0.040%-0.060% of C, less than or equal to 0.020% of Si, 0.20%-0.30% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0080% of S, 0.025%-0.040% of Al, less than or equal to 0.060% of Cr, less than or equal to 0.060% of Cu, less than or equal to 0.060% of Ni, less than or equal to 0.010% of Nb, less than or equal to 0.010% of V, less than or equal to 0.010% of Ti, less than or equal to 0.0030% of B and the balance of iron and inevitable impurities. The production method comprises the steps of converter smelting, LF furnace refining, RH furnace net circulation and continuous casting protective pouring. On the basis of ensuring the cleanliness of the molten steel, the casting times are increased to more than 30, the production efficiency is high, and the product quality is good.

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 belongs to the technical field of waste resource utilization, and particularly relates to a method for preparing crude arsenic by recycling arsenic-containing hydrogen gas. The method comprises the following steps: in an oxygen-isolated environment, introducing arsenic hydride-containing gas into a sulfuric acid aqueous solution with the mass fraction of 70%-98%, carrying out an oxidation-reduction reaction to obtain slurry containing crude arsenic, and carrying out solid-liquid separation to obtain a crude arsenic product. According to the method, the arsenic hydride gas can be directly converted into the arsenic elementary substance, so that the recovery of arsenic in the arsenic-containing material is realized. Concentrated sulfuric acid can fully oxidize arsenic hydride in a specific concentration range, and the arsenic hydride is prevented from being excessively oxidized into arsenic trioxide. Compared with other acidic or oxidizing solutions, the method has the advantages that the crude arsenic product with the purity larger than or equal to 95% can be directly obtained under the normal-temperature and normal-pressure conditions, the generated by-product dilute sulphuric acid can be circularly used for absorbing arsenic hydride again or used for leaching materials such as zinc arsenate-containing smoke dust to generate new arsenic hydride-containing gas, and therefore a closed-loop circulation process is formed; and efficient resource recovery and environment-friendly treatment are realized. The method is short in technological process, low in equipment requirement and small in energy consumption, the crude arsenic can be used as a precursor for preparing the high-purity arsenic, and a feasible scheme is provided for safety treatment and resource utilization of arsenic hydride in the industrial processes of metallurgy, wet refining and the like.

The invention relates to the technical field of metallurgy, in particular to a production process of ultra-low carbon steel. The production process provided by the invention comprises the steps of converter smelting, LF refining, RH refining and continuous casting, according to the method, oxygen is controlled in the whole process of converter + LF + RH, slag is adjusted by adopting a carburant, and a part of slag agent is added after the converter and in the refining process to adjust the CaO / Al2O3 ratio and the (FeO) content of the steel ladle slag, so that the purpose of reducing the oxidability of the steel ladle slag is achieved, on the basis of ensuring that the molten steel is not recarburized, part of Al deoxidation is replaced by a carbon deoxidation mode, the Al2O3 content in the molten steel is effectively reduced, and the steel ladle slag oxidation resistance is improved. And the cleanliness of the molten steel is further improved, so that the castability of the ultra-low carbon IF steel in continuous casting is improved, and the quality of ultra-low carbon steel is greatly 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.