1427 results about "Decarburization" patented technology

The invention relates to the field of steelmaking. More specifically, the invention relates to a process for controlling nitrogen increase in electric furnace smelting. The invention provides a method for producing low-nitrogen steel from electric furnace full waste steel. The method specifically comprises the steps that waste steel is loaded into an electric furnace, CO2 gas is injected into the electric furnace before and after loading, air is exhausted, and micro-positive pressure in the electric furnace is kept. The method comprises the following steps: after an electric furnace forms a molten pool, injecting limestone powder at the top of the furnace with the injection amount of 60-80kg / t and the injection carrier gas of CO2 gas, after the electric furnace forms the molten pool, injecting oxygen and carbon powder by adopting a carbon-oxygen lance to make foamed slag, injecting CO2 gas into the molten pool to decarburize, produce two times of CO gas and intensify denitrification, and during tapping of the electric furnace, protecting steel flow from ending with air by adopting CO2 gas, and feeding into the next process for smelting after tapping of the electric furnace. Application proves that when the method is used for smelting low-nitrogen steel, nitrogen in the electric furnace can be controlled not to be increased, N is smaller than or equal to 0.003% after tapping of the electric furnace, the smelting rate of the low-nitrogen steel grade is increased, and low-carbon emission production of special varieties is achieved.

The invention discloses a multi-stage carbon dioxide capture and utilization method and device. CO2-containing high-temperature flue gas enters an adsorption reactor and passes through the adsorption reactor filled with a bifunctional catalyst, and CO2 in the flue gas is adsorbed and captured by a catalytic material in a catalyst bed layer; decarburized gas comes out of the adsorption reactor, exchanges heat with process gas from the conversion reactor in a heat exchanger, and enters the next stage of adsorption reactor after heat exchange, when the adsorption reactor reaches the saturated adsorption capacity of an adsorbent, CO2-containing high-temperature flue gas is switched to enter the first stage of conversion reactor, at the moment, reducing gas enters the adsorption reactor, and the CO2-containing high-temperature flue gas enters the second stage of conversion reactor; and the converted synthesis gas is sent out of the device. By means of the technical process, the energy utilization rate can be fully increased, the emission reduction cost can be effectively reduced, high energy consumption caused by trapping cooling / conversion heating can be avoided, and the problems of high cost for purification and transportation after CO2 capture and potential safety hazards caused by burying are solved.

The invention belongs to the field of surface decarburization of agricultural transmission shafts, and particularly relates to a surface decarburization system and process based on a high-torsional-rigidity agricultural transmission shaft. The position, close to the right side, of the top end of the base is fixedly connected with the bottom end of a decarbonization device, and an oil film cleaning and conveying mechanism is arranged above the base. The oil film cleaning and conveying mechanism comprises a motor, the motor is arranged on the left side of the rear end of the base and fixedly connected with the base, and the front end of the motor penetrates through the base and is fixedly connected with the rear end of a first transmission roller; through the design of the oil film cleaning and conveying mechanism, the function of removing the oil film on the surface of the transmission shaft is achieved, and the problems that an existing device is not provided with an assembly capable of removing the oil film on the surface of the agricultural transmission shaft before decarburization, and when the oil film exists on the surface of the agricultural transmission shaft and the decarburization operation is directly carried out are solved. And the oil film can isolate the surface of the transmission shaft from decarburization gas, so that the problem of local non-decarburization phenomenon caused by non-uniform reaction is solved, and the decarburization effect is improved.

The invention provides an online detection and compensation method for local decarburization of a high-strength spring steel band, which comprises the following steps: arranging an oxygen content sensor in a continuous annealing furnace to monitor oxygen concentration in real time, and marking a potential decarburization risk section; scanning the risk section steel strip by adopting infrared thermal imaging, and generating a carbon distribution map to position a decarburization area; pulse laser heating is conducted on the decarburization area, and methane-argon mixed gas is introduced to achieve in-situ carburization; and finally, local thermal stress is eliminated through high-frequency induction heating. According to the method, decarburization risk dynamic early warning, defect accurate positioning, local efficient carbon supplementation and stress homogenization control are achieved, and the surface quality and fatigue performance of the steel strip are remarkably improved.

The invention discloses a converter steelmaking molten pool carbon content detection method and system, a medium and a terminal, and the method comprises the steps: responding to a converter steelmaking signal, starting a three-section model, and obtaining the height of an oxygen lance and the oxygen flow of the oxygen lance in real time in the converter steelmaking process; a first carbon content detection value of a molten pool in the converter at the current moment is obtained through real-time analysis by utilizing a three-section type model and combining the height of an oxygen lance, the oxygen flow of the oxygen lance, the weight of waste steel added into the converter, the weight of molten iron and the carbon content; when the converter is in the last steelmaking stage, if a detection signal sent by the detection equipment is received, a second carbon content detection value of the molten pool in the converter at the current moment is obtained through real-time analysis based on the detection signal, and the first carbon content detection value and the second carbon content detection value are fused to obtain a carbon content detection result of the molten pool at the current moment. According to the method, the influence of the oxygen lance position, the oxygen flow and feeding on the decarburization rate is considered, the carbon content detection in the whole steelmaking process is realized, and the detection precision in the last steelmaking stage is optimized.

This application relates to the field of ceramsite, and specifically discloses a preparation process for two-stage water-retaining ceramsite from coal gangue. The preparation process includes green pellet preparation, drying section, pyrolysis section, decarbonization section, first roasting section, soaking section, second roasting section, and cooling section; the green pellet preparation includes: wetting coal gangue powder with an organic solution, stirring evenly, and kneading with biomass material. The mass ratio of coal gangue powder to biomass material is 1 kg:(3-9) g to obtain green pellets; the soaking section includes: transferring the green pellets after the first roasting section to the soaking section, with the material layer temperature below 900 °C, and evenly spraying nano-silica during the transfer process, spraying 1-2.5 g per 100 g of green pellets; the cooling section includes: using one of sodium bicarbonate solution, ammonium bicarbonate, and ammonia water to form a water mist mixed with air to cool the roasted ceramsite. The prepared ceramsite has a rich and gradient pore structure, can quickly absorb water, and has excellent water-retaining performance.

The invention discloses a heat treatment process for a high-strength automobile fastener wire rod, and belongs to the field of automobile fastener machining. Comprising the following steps that S1, metal wires are pretreated, and pretreatment comprises ultrasonic cleaning, chemical oil removal and continuous flushing and drying; s2, the metal wire pretreated in the S1 is placed in a heating environment filled with carbon potential control gas and heated to be in a complete austenitizing state, and an online temperature monitoring means is adopted in the period; and S3, high-frequency induction heating is conducted on the metal wire through high-frequency induction heating equipment, and full-section temperature balanced temperature rise is achieved. Through combination of vacuum pretreatment and short-time high-temperature induction heating, surface oxidation and carbon dissipation are effectively reduced, the thickness of a complete decarburized layer and the thickness of a total decarburized layer are remarkably reduced, and the surface strength and fatigue performance of the fastener are improved.

The invention belongs to the technical field of cold-rolled oriented electrical steel strip manufacturing, and particularly relates to a low-noise cold-rolled oriented electrical steel strip for a transformer, a preparation method of the low-noise cold-rolled oriented electrical steel strip and the transformer. The method comprises the following steps: heating a sheet billet to obtain a heated sheet billet, carrying out hot continuous rolling on the heated sheet billet to obtain a hot-rolled sheet, and sequentially carrying out normalizing pickling, primary cold rolling, decarburization annealing, secondary cold rolling, MgO separant coating, cover type high-temperature annealing, stretching leveling and insulating coating on the hot-rolled sheet to prepare a finished oriented electrical steel strip with the thickness of 0.15-0.20 mm, the slab comprises the following chemical elements in percentage by mass: 0.02% < = C < = 0.08%, 2.50% < = Si < = 3.20%, 0.10% < = Mn < = 0.50%, 0.02% < = P, 0.05% < = Als < = 0.15%, 0.10% < = Cu < = 0.50%, 0.05% < = Sb < = 0.15%, 0.005% < = S < = 0.015%, 0.005% < = N < = 0.015%, 0.004% < = Ti and the balance of Fe and inevitable impurities. The iron loss P1.7 / 50 of the cold-rolled oriented electrical steel strip finished product prepared by the method is less than or equal to 1.00 W / kg, the iron loss B8 is greater than or equal to 1.94 T, and the test noise of a transformer manufactured by the steel strip at a position of 3m is less than 15dB.

The invention discloses a method for calculating the hot lag time of tuyere blowing coal gas of a hydrogen-carbon-rich circulating oxygen blast furnace, which comprises the following steps of: calculating the hot lag time of tuyere blowing high-temperature upgraded coal gas according to the blank volume of the hydrogen-carbon-rich circulating oxygen blast furnace, the time required by each batch of materials, the volume between the lower part of a furnace body and the central line of a tuyere and a smelting period; and according to the heat lag time and the smelting period of the tuyere injection decarburized gas, the adjustment time of the tuyere injection decarburized gas is confirmed, and finally an operation basis is provided for furnace heat adjustment of the hydrogen-rich carbon circulation oxygen blast furnace. According to the method, the problem that the furnace heat adjusting time is difficult to determine due to the heat hysteresis of the tuyere blowing gas of the hydrogen-rich carbon circulating oxygen blast furnace is solved.

The invention relates to large-specification alloy spring steel and a production method thereof. The control process comprises the steps of steelmaking, bloom continuous casting, heating cogging, coping flaw detection, anti-decarburization segmented spraying, small square billet heating, high-speed wire controlled rolling, stelmor wire controlled cooling and coil collecting and packaging. And the surface quality and the structure property uniformity of the wire rod are effectively improved by combining segmented spraying of the anti-decarburization coating with a refined controlled rolling and controlled cooling process, and the wire rod can be used for preparing the large-size high-strength automobile suspension spring.

The invention relates to the technical field of fired ceramsite, and particularly discloses high-strength ceramsite prepared from coal gangue as well as a preparation method and application of the high-strength ceramsite. The invention discloses a preparation method for preparing ceramic particles from coal gangue. The preparation method comprises the following steps: drying; performing pyrolysis; decarburization: carrying out heating combustion-supporting on a material layer from top to bottom by hot air with the temperature of 450-600 DEG C from the pyrolysis section and the cooling section in the decarburization section, and completing decarburization of the ceramsite from top to bottom; hot air from the cooling section is subjected to heat compensation and temperature rise to heat ceramsite, the temperature of a ceramsite material layer is 1000-1140 DEG C, and the ceramsite material layer is subjected to heating combustion supporting from top to bottom; and cooling: cooling the roasted ceramsite to 80-100 DEG C. By means of the technical scheme, the treatment scale of the coal gangue ceramsite can be increased, the production cost is effectively reduced, and the ceramsite meets the requirements for decarburization, low water absorption and high strength.

The utility model relates to the technical field of roller manufacturing and processing, and discloses a roller spray quenching processing device and a cooling liquid recycling regulation and control system thereof, which comprise a barrel body, a cooling liquid recycling regulation and control system, a cooling liquid recycling regulation and control system, a cooling liquid recycling regulation and control system and a cooling liquid recycling regulation and control system, a cooling liquid recycling regulation and control system, a cooling liquid recycling regulation and control system and a cooling liquid recycling regulation and control system, the cleaning mechanism is arranged in the barrel and used for cleaning an oxidation layer or a decarburization layer formed on the surface of a roller in the high-temperature quenching process, and the spray quenching cooling liquid recycling regulation and control system comprises a temperature sensor, a temperature sensor, a temperature sensor, a temperature sensor, a temperature sensor, a temperature sensor, a temperature sensor and a temperature sensor, and the temperature sensor is arranged in the liquid distribution pipe and used for detecting the temperature of cooling liquid and recycling liquid in a pipeline; and the PLC is used for integrally controlling and coordinating the operation of the system. Uniform quenching is ensured through the rotating assembly and the limiting assembly, the cleaning assembly automatically adapts to and cleans impurities on the surface of the roller, the cooling effect and the mechanical performance are improved, the problems of cooling liquid waste and unstable temperature are solved through the recycling assembly, resource recycling is achieved, and the production cost is reduced.

The invention provides a gas purification and separation method and device, and belongs to the technical field of gas purification. The method comprises the following steps: mixing process gas and methanol, and sequentially carrying out condensation treatment and gas-liquid separation treatment to obtain gas-liquid separation process gas and acidic gas condensate; carrying out methanol washing on the gas-liquid separation process gas to realize desulfurization and decarbonization so as to obtain purified gas and rich methanol (including first sulfur-containing methanol and carbon-rich methanol); carrying out first flash separation treatment on the acidic gas condensate to respectively obtain acidic gas, second sulfur-containing methanol and solid carbon dioxide; washing the solid carbon dioxide with methanol, dissolving the solid carbon dioxide in methanol, and carrying out second flash separation treatment on the obtained methanol rich in carbon dioxide to respectively obtain gas carbon dioxide and cold methanol containing carbon dioxide; the carbon dioxide-containing cold methanol can be reused for dissolving the washed solid carbon dioxide after being heated; heat exchange is carried out between the second flash separation treatment and the condensation treatment. The method has a good process gas purification and separation effect, and has the advantages of energy conservation and consumption reduction.

The invention discloses a system and a method for producing sponge iron by coupling a gasification furnace and a gas-based shaft furnace. The system comprises a coal pretreatment device for pretreating received raw material coal; the gasification furnace receives the raw material coal treated by the coal pretreatment device through a conveying device, and synthesis gas is obtained through reaction; the mixer receives furnace top gas generated by the gas-based shaft furnace, mixes the furnace top gas with synthesis gas to obtain mixed gas, and outputs the mixed gas to the dust remover; the high-temperature desulfurization device is used for carrying out desulfurization treatment on the dedusted mixed gas by using a high-temperature desulfurization agent, and the high-temperature decarbonization device is used for carrying out decarbonization treatment on the desulfurized mixed gas and outputting the decarbonized mixed gas to the gas-based shaft furnace; iron ore and / or oxidized pellets are / is arranged in the gas-based shaft furnace, the decarbonized mixed gas is received, and sponge iron is generated through reaction. According to the method, the synthesis gas is cooled by using the furnace top gas, additional cooling equipment is not needed, the cost is reduced, the energy utilization rate is increased, and cleaner and more efficient sponge iron production is realized.

The invention discloses a coal seam natural gas decarburization hydrogen production process and an automatic control system, and relates to the technical field of hydrogen preparation, a decarburization hydrogen production unit comprises: a reactor comprising a reaction zone, the reaction zone being internally provided with a reaction tank; a set amount of catalyst is added into the reaction tank through the feeding part, so that the hydrogen production efficiency of natural gas is improved; a plurality of natural gas inlets communicated with the reaction tank are formed in the reaction tank, so that the rate that natural gas enters the reaction tank and starts to contact and react with a catalyst is increased; a plurality of natural gas inlets are uniformly distributed on the reaction tank, so that the natural gas hydrogen production reaction can be fully catalyzed; the first valves are independently arranged, and the controller can change the adjusting parameters of the first valves, so that the catalyst in the reaction tank can efficiently and fully react with a proper amount of natural gas in unit time, and the hydrogen production efficiency of the natural gas is further improved.

The invention discloses a carbon capture and amine recovery system. The system comprises a rough washing tower, an absorption tower, a decarbonization tower and a deamination tower which are sequentially connected through a pipeline system, the rough washing tower is used for removing pollutants in the flue gas, including sulfur oxides, PM particles, hydrogen sulfide and the like; an amine solution spraying module is arranged at the upper part of the absorption tower, flue gas enters from a lower layer area of the absorption tower, and the amine solution spraying module sprays an amine solution to capture carbon dioxide in the flue gas so as to form a carbon capture solution and decarbonized flue gas; the decarburization tower is used for receiving the carbon capture solution and treating the carbon capture solution to obtain high-purity CO2 and a recovery solution; wherein the high-purity CO2 is discharged or retreated; the recovery solution flows back to an amine solution spraying module in the upper layer area of the absorption tower through a pipeline system to realize cyclic utilization; and the decarbonized flue gas is upwards conveyed to a deamination tower, and is discharged after deamination. Through one set of system, three-stage flue gas purification treatment of desulfurization, carbon capture and amine capture and recovery is realized, and the whole set of system is high in recovery efficiency.

The invention provides a preparation method of a Fe3C catalyst. The preparation method comprises the following steps: preparing a ferric salt solution; transferring the ferric salt solution into a crystallization kettle for hydrothermal aging; centrifugally separating and collecting solids, washing and drying to obtain a catalyst precursor; and carrying out reduction carbonization on the catalyst precursor, and then carrying out decarbonization treatment to obtain the Fe3C catalyst. The catalyst prepared by the invention is high in CO conversion rate and low in CO2 and CH4 selectivity in Fischer-Tropsch synthesis, and has excellent catalytic activity and stability.

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.

This application relates to the technical field of firing ceramsite, and specifically discloses a high-strength ceramsite made of coal gangue, its preparation method and application. The preparation method of the coal gangue ceramsite disclosed in this application is as follows: drying; pyrolysis; decarbonization: the hot air at 450-600°C from the pyrolysis section and the cooling section heats the material layer from top to bottom in the decarbonization section to assist combustion, and the decarbonization of the ceramsite is completed from top to bottom; roasting: the hot air from the cooling section is heated by supplementary heating to heat the ceramsite, the temperature of the ceramsite material layer is 1000-1140°C, and the material layer is heated from top to bottom to assist combustion; cooling: the ceramsite after roasting is cooled to 80-100°C. Using the technical solution of this application can improve the processing scale of coal gangue ceramsite, effectively reduce production costs, and enable the ceramsite to meet the requirements of decarbonization, low water absorption and high strength.

The invention relates to the technical field of metal injection molding, and discloses a process for preparing an ultrahigh-toughness MIM part through integration of multistage degreasing and gradient sintering, and the process comprises the following steps: metal powder and a binder are mixed in proportion, and uniform feed is obtained after banburying and granulation; injection-molding the feedstock into a green body; the green body is sequentially subjected to catalytic degreasing and stepped thermal degreasing, the catalytic degreasing is carried out in a nitric acid-containing atmosphere, and the thermal degreasing is carried out in a multi-stage heating procedure under the protection of inert gas; and carrying out multi-stage gradient sintering on the degreased green body in a vacuum or inert atmosphere, wherein the multi-stage gradient sintering comprises low-temperature pre-sintering, medium-temperature deoxidization and decarbonization and high-temperature densification sintering. According to the invention, through organic combination of multi-stage catalytic degreasing and stepped thermal degreasing, efficient and thorough removal of the binder is realized, carbon residues, bubbles and internal defects caused by incomplete degreasing are effectively avoided, and the quality of the green body and the structural integrity before sintering are improved.

The invention discloses a decarburization coal power system coupled with a reversible Brayton cycle heat pump and a method thereof. The decarburization coal power system comprises a coal-fired power generation subsystem used for converting heat into electric energy, a decarburization subsystem used for treating carbon dioxide emission and a heat pump heat storage subsystem used for improving the energy utilization efficiency. Exhausted smoke of a boiler in the coal-fired power generation subsystem passes through a smoke steam cooler in the decarburization subsystem and then enters an absorption tower; the coal-fired power generation subsystem sends high-temperature steam generated by a boiler into the heat pump heat storage subsystem through a high-pressure cylinder and an intermediate-pressure cylinder, and the heat pump heat storage subsystem stores high-temperature molten salt after heat absorption into a high-temperature storage tank. The system has the beneficial effects that the heat pump heat storage subsystem is constructed through the reversible Brayton cycle, supercritical carbon dioxide is adopted as a cycle working medium, and a phase change material and molten salt are adopted as heat storage media, so that the energy storage density is improved, and the stability and high efficiency of the heat storage and release process are guaranteed; therefore, the system can better adapt to fluctuation of the power grid load, and quick response is realized.

The invention discloses a source and storage integrated low-carbon power generation system and an operation method. The system comprises a coal-fired power generation subsystem, a decarburization subsystem and a pump heat energy storage subsystem. In order to improve the operation flexibility and the energy efficiency level of the system, the system is optimized as follows: (1) in a low ebb of electricity consumption, electric energy is output to drive a compressor to pressurize and heat steam extracted by an intermediate-pressure cylinder, then molten salt is heated, and then the steam enters a reboiler after acting through an expansion machine; and finally, redundant electric energy is converted into heat energy of the fused salt to be stored. And (2) in the peak period of power utilization, the feed water from the deaerator is heated by the high-temperature fused salt stored in the fused salt storage tank and then enters the expansion machine to do work, so that the output of the decarburization coal-fired power generation unit is improved. And the extracted steam of the intermediate-pressure cylinder acts through the expansion machine and then enters the reboiler. And (3) normal-temperature water serves as a heat absorption working medium, waste heat in the decarburization process is sequentially absorbed according to the heat grade, and part of medium-pressure cylinder extraction steam is replaced under the action of the ejector to provide heat for the reboiler. According to the system, the carbon capture energy efficiency punishment is effectively reduced, and the operation flexibility is improved.

The invention relates to the technical field of comprehensive utilization of coal gasification ash, and discloses a coal gasification ash solid waste quality-divided gradient comprehensive utilization method which comprises the following steps: dividing ash into coarse slag and fine slag; performing physical separation on the fine slag to obtain a fine slag filter cake with the carbon content of 5-70%, first low-carbon ash slag with the carbon content of less than or equal to 5% and carbon-rich ash slag with the carbon content of more than or equal to 70%; forming the fine slag filter cake into second low-carbon ash slag by utilizing a fine slag decarburization technology; adding a binder into the carbon-rich ash residue, and gasifying for utilization to obtain third low-carbon ash residue and coal gas; preparing polyaluminum chloride and the like from the high-aluminum ash with Al2O3 greater than or equal to 20% in the low-carbon ash; preparing a water glass agent from the high-silicon ash slag with SiO2 greater than or equal to 40%; preparing a coal-based solid waste cementing material or a coal-based solid waste filling material from the low-silicon aluminum ash residue containing less than 40% of SiO2 and less than 20% of Al2O3 and coal gangue or fly ash; the ash utilization method is simple, the comprehensive utilization rate is high, the coal gasification ash can be treated on a large scale, the ecological environment is protected, and the value of the coal gasification ash can be fully utilized.

The invention discloses a preparation method of a WC reinforced composite coating. The preparation method comprises the following steps: uniformly mixing ZrO2-WC composite powder with nickel-based alloy powder to obtain raw material powder; the density of the ZrO2-WC composite powder is similar to that of the nickel-based alloy powder, and the ZrO2-WC composite powder is a core-shell structure particle formed by coating WC particles with ZrO2; and cladding the raw material powder on the surface of a metal substrate by adopting a laser cladding method to obtain the WC reinforced composite coating. On one hand, the problems of decarburization and burning loss of WC in the laser cladding process are effectively avoided through the protection effect of ZrO2 with great heat generated by coating the outside of the composite powder; in addition, the density of the composite WC reinforced powder is close to that of the parent phase of the coating, the problem that the WC reinforced phase sinks and segregates in a laser molten pool due to the fact that the density difference between the conventional WC reinforced phase and the parent phase is too large can be solved, and therefore the high-performance composite coating with the WC reinforced phase free of decarburization and burning loss, uniform in distribution and free of cracks is obtained.

The invention discloses a heating process for reducing surface decarburization of spring steel, which is characterized in that during billet heating, peak temperature intervals such as 800 DEG C and 1100 DEG C which are easy to cause intensification of a decarburized layer are avoided, the heating temperature is controlled between 950 DEG C and 1050 DEG C, the heating rate is adjusted according to production requirements, the spring steel quickly passes through a two-phase region, the retention time in the region is reduced, and the surface decarburization of the spring steel is reduced. The formation of a grain boundary ferrite fully decarburized layer is inhibited; the heat preservation time is controlled within 1.5-2 hours; after heating is completed, the steel billet is rapidly taken out and cooled to the room temperature in an air cooling mode; the spring steel is made of W55SiCrC steel for high-end automobiles. The method for optimizing the heating temperature, rapidly passing through the two-phase region and reasonably setting the heat preservation time is utilized, the thickness and structure uniformity of a decarburized layer on the surface of the spring steel are remarkably improved, and therefore the anti-fatigue performance of the spring steel is remarkably improved, and the service life of the spring steel is remarkably prolonged.

The invention discloses a method for separating valuable metal in a waste photovoltaic welding strip through reduction smelting-vacuum gasification-vulcanization, and belongs to the technical field of resource recycling. The method comprises the steps that the waste photovoltaic welding strip is placed in a reducing atmosphere and heated for reduction smelting, so that carbon impurities on the surface of the waste photovoltaic welding strip are removed, tin, lead, silver and copper oxides on the surface are reduced, and a copper-tin-lead-silver alloy is obtained; then, heating the decarbonized and deoxidized photovoltaic welding strip under a vacuum condition, and carrying out vacuum gasification separation to obtain condensed metal lead and a copper-tin-silver alloy; and finally, sulfur is added into the copper-tin-silver alloy for vacuum vulcanization-separation, and volatile matter stannous sulfide and residual copper-silver alloy are obtained. According to the method, valuable metals in the waste photovoltaic solder strip can be efficiently separated, and the method has the advantages of being green and economical.

The invention belongs to the technical field of rolling, and particularly relates to an anti-decarburization and anti-brittle failure controlled cooling process for a high-silicon-chromium alloy tool steel wire rod. Aiming at the dilemma that the hot-rolled wire rod which contains more than 2.0% of Si, more than 1.1% of Cr, Mo, V and other alloy elements not only meets the decarburization requirement of a product, but also does not have brittle failure of the wire rod, the method comprises the following steps: firstly, determining the cover entering temperature of the hot-rolled wire rod, the cooling speed of the wire rod before the hot-rolled wire rod enters the cover and other key process parameters; and then the method is realized by adjusting the speed of a roller way, the number of opened heat preservation covers after spinning, a fan Jinling device, the air volume of a fan, the spinning temperature and the like, so that the hot rolling structure of the wire rod is a pearlite structure which is not easy to brittle, and meanwhile, the requirement that the decarburization of a product does not exceed 0.55 D (D is the diameter of the wire rod) is met.

The invention discloses a method for improving castability of a high-purity industrial pure iron small square billet production line. The method comprises the following steps of KR molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment and continuous casting. According to the method, in the early stage of LF, oxidizing slag is used for removing manganese and phosphorus, in the later stage, slagging-off modification treatment is carried out, a minimum LF and minimum outbound oxygen formula is formulated, so that the RH carbon-oxygen reaction requirement is met, vacuum natural decarburization is used, RH end point carbon can be stably controlled to be 0.0007-0.001%, after RH aluminum is added for deoxidation, a calcium deoxidizing agent is added under the low-true-degree condition for inclusion denaturation, and the RH carbon-oxygen reaction requirement is met. By means of the method, continuous production can be achieved on an industrial pure iron small square billet production line, the finished product C is smaller than or equal to 0.0015%, Mn is smaller than or equal to 0.025%, P is smaller than or equal to 0.003%, S is smaller than or equal to 0.003%, the high industrial level can be achieved, the number of continuous casting furnaces is larger than or equal to 7, and the method is particularly suitable for producing pure iron on a production line without RH top lance equipment in the RH procedure.

The invention discloses a smelting process of a nickel-chromium-iron-based alloy, which comprises the following steps of: smelting and pouring a cast ingot by adopting an EAF (Electric Arc Furnace)-LF (Ladle Furnace)-VOD (Vacuum Oxygen Decarburization) furnace-LF (Ladle Furnace)-die casting process route, carrying out VOD vacuum oxygen decarburization by utilizing coarse smelting molten steel obtained by full scrap steel smelting in the electric arc furnace, and using nitrogen in the LF furnace to replace nitrided chromium iron to increase nitrogen. The desulfurization and deoxidation control parameters of each furnace are optimized, and finally the yield of Cr is controlled to be 99% or above and the yield of C is controlled to be 0.025% or below through a VOD oxygen blowing decarburization model; according to an LF furnace nitrogen increasing model, the nitrogen content of molten steel is accurately controlled, meanwhile, oxygen in the molten steel is controlled to be 0.003% or below, other chemical components meet the standard requirements, and the problem that the nickel-chromium-iron-based alloy is smelted through an electric arc furnace, and key elements cannot be accurately controlled is solved.

The invention discloses a NiCu-based alloy catalyst for preparing high-value products through natural gas decarbonization and application of the NiCu-based alloy catalyst, and belongs to the technical field of natural gas high-value catalytic conversion. The preparation method of the NiCu-based alloy catalyst comprises the following steps: (1) adding nickel nitrate hexahydrate and urea into hot water, adding ethylene glycol, carrying out a stirring reaction at 120-150 DEG C, and calcining the obtained intermediate to obtain a nickel oxide precursor; (2) adding a copper nitrate aqueous solution and ammonia water into the nickel oxide precursor, so that copper ions are anchored on the surface of nickel oxide, drying and calcining to obtain a Ni-Cu alloy oxide precursor; and (3) adding the Ni-Cu alloy oxide precursor, bismuth trioxide and metallic tin into deionized water, adding a complexing agent, carrying out ultrasonic treatment, and carrying out H2 reduction calcination on the obtained precipitate to obtain the Ni < x > Cu < y > Bi < z > Snm alloy. The NiCu-based alloy catalyst is used in a natural gas decarburization high-value product preparation reaction, and the natural gas decarburization reaction is sufficient, and long-term efficient conversion and stable operation are achieved by combining the synergistic effect of ultrasonic waves and an alternating magnetic field.