1120 results about "Decarburization" patented technology

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 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 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 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 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 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.

The invention provides a method for manufacturing a terbium-dysprosium-iron giant magnetostrictive alloy based on three-dimensional photocuring molding, which comprises the following steps of: firstly, preparing three-dimensional photocuring molding slurry, adopting photosensitive resin as a matrix, and matching with a metal organic chelating agent containing terbium-dysprosium-iron giant magnetostrictive alloy component to enhance the uniform distribution of metal powder so as to ensure the printing precision and the material stability; secondly, the resin and the chelating agent are removed through heat treatment degreasing, the degreasing process is controlled by controlling the heating rate, and structural collapse is avoided; decarburization is carried out in a low-oxygen atmosphere, so that the purity of the alloy is improved, and the structural integrity before sintering is ensured; then reduction treatment is performed to improve the structural stability and purity; and finally, high-temperature sintering is carried out under the assistance of a magnetic field, grain orientation and magnetic domain arrangement are optimized, and the magnetostrictive effect and the force-magnetic energy conversion efficiency are improved. According to the method, three-dimensional light curing forming and magnetic field auxiliary heat treatment are combined, and the risk of structural damage in the printing process of the terbium dysprosium iron giant magnetostrictive alloy is practically and effectively avoided.

The invention discloses a calcination and afterburning integrated coal gangue decarbonization device. The coal gangue decarbonization device comprises a shell, a multi-channel pulverized coal combustion gun and a secondary air heating combustor, an air reversing cavity, a combustion cavity and a calcination cavity which are sequentially communicated in the gas flowing direction are formed in the shell, the air reversing cavity is provided with a secondary combustion-supporting air inlet, the combustion cavity is provided with a primary air inlet and a tertiary combustion-supporting air inlet, and the calcination cavity is provided with a coal gangue feeding port. The multi-channel pulverized coal combustion gun is inserted into the primary air inlet, and the secondary air heating combustor is arranged close to the secondary combustion-supporting air inlet. The structure of the coal gangue calcining device is simplified, the problems of material cost, air leakage, heat loss and the like of external equipment and pipelines are reduced, and the construction and operation cost of the coal gangue calcining device is reduced. Meanwhile, through the hot air chamber furnace structure adapting to fine powder combustion and the high-temperature secondary air heating process design, the problems that the low-heating-value coal gangue is difficult to ignite and the heat value cannot be released are solved, and suspension calcination of the low-heating-value coal gangue is achieved.

The invention discloses a method for preparing coal and calcined kaolin through coal gangue grinding and grading-acid leaching-suspension calcination, and belongs to the technical field of coal gangue beneficiation. According to the method disclosed by the invention, the three stages of ore grinding flotation, acid leaching purification and fine grinding calcination complement each other, so that fine-grained calcined kaolin of which the content of-7 microns is greater than or equal to 90% and the whiteness is greater than or equal to 90% and ultrafine-grained calcined kaolin of which the content of-2 microns is greater than or equal to 90% and the whiteness is greater than or equal to 90% are prepared. According to the method, effective separation of coarse coal, leaching and purification of impurity iron elements and calcination and purification of fine-grained kaolin are realized through step grinding and step separation; the gas-solid reaction degree is improved and sintering is avoided by utilizing the dispersion and suspension characteristics of fine-particle materials; the dehydroxylation and decarburization reactions can be carried out completely by calcining fine materials and precisely controlling the temperature, so that the whiteness of the calcined kaolin product is remarkably improved. According to the method, the adaptability to coal gangue raw ore is improved, and meanwhile, a new thought is provided for efficiently preparing a calcined kaolin product from the coal gangue and cooperatively recycling coal resources.

The present invention discloses a natural gas amine liquid decarburization process apparatus, which comprises: a decarburization device, which comprises an absorption tower and a rectification tower, and the absorption tower is communicated with the rectification tower; the heat exchange equipment comprises an air inlet pipe, a preheater, a reheater, a first control pipeline and a second control pipeline, the outlet end of the air inlet pipe communicates with an air inlet of the preheater and an air inlet of the reheater, and first electromagnetic valves are arranged at the air inlet of the preheater and the air inlet of the reheater correspondingly; a second electromagnetic valve located between the two first electromagnetic valves is arranged on the air inlet pipe; the first control pipeline is respectively communicated with the preheater, the gas inlet pipe and the second control pipeline, the second control pipeline is communicated with the absorption tower and the reheater, and feed gas enters from the gas inlet pipe and flows into the absorption tower through the preheater and / or the reheater. Therefore, waste heat generated by the absorption tower and the rectifying tower can be reasonably recycled and used as a heat source to heat the raw material gas, an additional heating source does not need to be arranged, and the cost is greatly reduced.

The invention discloses a rolling manufacturing method of low-decarburization medium-chromium round steel for a caterpillar track link and a product of the rolling manufacturing method, and belongs to the technical field of alloy steel rolling. The method comprises the following steps: smelting molten steel, wherein the molten steel comprises the following components in percentage by mass: 0.28-0.34% of C, 0.15-0.35% of Si, 0.50-0.85% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.80-1.10% of Cr, less than or equal to 0.30% of Ni, 0.10-0.30% of Mo, less than or equal to 0.30% of Cu, 0.010-0.060% of Al and the balance of Fe and impurities; lF refining, RH vacuum degassing (the time is longer than or equal to 20 min, and the hydrogen content is smaller than or equal to 1.5 ppm), electromagnetic stirring continuous casting (the superheat degree is 15-25 DEG C), slow cooling (longer than or equal to 12 h), segmented heating (the total time is shorter than or equal to 200 min, and the residual oxygen content is lt, 3%), multi-stage high-pressure water descaling (the pressure before finish rolling is 30-35 MPa) and hot continuous rolling (the compression ratio is larger than or equal to 6) are conducted. The total decarburized layer depth of the obtained round steel is smaller than or equal to 0.30 mm, and the round steel has high hardenability, excellent mechanical property and low surface defect rate and is suitable for heavy-load components such as a hydraulic excavator caterpillar track link.

The invention discloses a method for improving the molybdenum yield in the direct alloying process of molybdenum oxide, which comprises the following steps of: 1, adjusting the lance position of an oxygen lance, and detecting a sonar slagging curve and a CO curve: judging the foaming performance of slag by combining sonar slagging and a furnace gas CO curve in the smelting process; step 2, molybdenum oxide is added, bottom blowing is enhanced, and the lance position of an oxygen lance is reduced; and step 3, the lance position is further reduced, the lance position is reduced to 0.1-0.3 m below the basic lance position, the decarburization speed is increased to 0.3% / min or above, volatilization of molybdenum oxide is inhibited through slag foaming and high CaO content, and the yield of molybdenum is increased. The slag composition and foaming performance are controlled by adjusting the lance position of the oxygen lance, the slag foaming performance is judged by combining sonar slagging and a furnace gas CO curve, a molybdenum oxide raw material is added when the slag foaming performance is good, and meanwhile volatilization of molybdenum oxide is inhibited through slag foaming and high CaO content. The sublimation of molybdenum oxide is effectively prevented, the yield of metal molybdenum can reach 95% or above, and the production cost of the molybdenum-containing steel grade is reduced.

The invention discloses a method for producing ultra-low carbon steel by an electric furnace process, which comprises the following steps: in the electric arc furnace smelting process, blowing carbon powder and CO2 by using a carbon gun, tapping after the component temperature of molten steel reaches the standard, and adding lime and limestone in the tapping process to obtain primary molten steel; slagging off after a steel ladle enters an LF station, adding aluminum slag into an LF furnace for slag modification, raising the temperature to heat molten steel, and discharging from the station to obtain LF refined molten steel; after a steel ladle enters an RH station, vacuumizing, using argon as circulation gas, spraying metal oxide powder and O2 by using a top lance, carrying out deep decarburization and denitrification at the same time, adding a metal material in the final stage of RH furnace refining to carry out deoxidation alloying, and then breaking vacuum and leaving from the station to obtain RH refined molten steel; and the steel ladle enters a continuous casting station for casting, and the ultra-low carbon steel is obtained. The method can solve the technical problem of producing ultra-low carbon steel in an electric furnace process, and is good in product quality and high in production efficiency.

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 utility model relates to the technical field of natural gas production, in particular to natural gas desulfurization and decarbonization equipment which comprises a supporting table and a natural gas impurity removal assembly, the natural gas impurity removal assembly comprises a separation tank, a gas inlet pipe, a one-way valve, a conveying pipe and a protection valve, and the separation tank is detachably connected with the supporting table and located above the supporting table; the gas inlet pipe is fixedly connected with the separation tank and located on one side of the separation tank, the one-way valve is fixedly connected with the gas inlet pipe and located in the gas inlet pipe, the conveying pipe is fixedly connected with the separation tank and located on the side, close to the gas inlet pipe, of the separation tank, and the protection valve is fixedly connected with the conveying pipe and located in the conveying pipe. Therefore, the problems that in the prior art, a multi-filtering mechanism cannot rapidly separate sulfide, a certain time is needed to naturally separate sulfide in natural gas, and practicability is low are effectively solved.

The invention discloses alloy spring steel, a wire rod, a spring and a preparation method and application thereof and belongs to the technical field of alloy spring steel. The preparation method of the alloy spring steel comprises the following steps: S1, steelmaking; s2, performing continuous casting to obtain a bloom; s3, the large square billets are subjected to hot charging and hot conveying to a heating furnace, and cogging is conducted after heating, so that small square billets are obtained; in the hot charging and hot delivery process, after high-pressure water is adopted for descaling a bloom, anti-decarburization slurry A is sprayed; the coating A is prepared from the following components: 35 to 40 percent of SiO2, 22 to 26 percent of SiC, 11 to 15 percent of Al2O3, 6 to 10 percent of MgO, 5 to 8 percent of TiO2, 3 to 6 percent of ZrO2 and 3 to 6 percent of CaO; s4, cold charging and spraying of anti-decarburization slurry B; and S5, the small square billet is heated, rolled and cooled, and the alloy spring steel is obtained. On the basis of ensuring the strength and fatigue resistance of the spring, the production cycle is shortened, the loss is reduced, and the cost is reduced.

The utility model provides a dissimilar steel strip isolating layer submerged-arc welding structure which comprises a first base material and a second base material, the edges of the first base material and the second base material are subjected to the same beveling operation, specifically, the front side and the back side of each plate end are each provided with a beveled edge, the plate ends are assembled to form an X-shaped beveled edge, and a truncated edge is reserved in the middle of each beveled edge; and surfacing the edge of the first base material to form a first welding body with the same thickness, butting the edges of the first base material and the second base material, and welding to obtain a second welding body. According to the method, subsequent submerged-arc welding is converted into similar steel welding through the isolation layer structure, and the risk of cracking caused by interaction of high residual stress and brittle structures after dissimilar steel welding is eliminated; and meanwhile, the problems that a wide recarburization and decarburization layer is generated due to carbon diffusion migration in direct welding of dissimilar steel, and cracking is caused due to serious ferrite embrittlement of a decarburized wide ferrite belt under long-time heat treatment and high-temperature operation are solved.

The invention discloses spring round steel with high strength, high toughness and long fatigue life and a production method of the spring round steel, and belongs to the technical field of spring round steel production, the key of the chemical components of the spring round steel is that the spring round steel comprises 0.90-1.10% of Ni and 0.13-0.17% of V, and the content of harmful elements such as O, N, S and P is strictly controlled. Ultra-low oxygen content and extremely high purity are ensured by adopting VD vacuum refining, surface decarburization is effectively prevented by applying argon and vacuum atmosphere protection heating, non-recrystallization region low-temperature rolling is implemented to refine grains, and an optimized quenching and medium-temperature tempering heat treatment system is matched. The technical bottlenecks that the strength and toughness of traditional spring round steel are difficult to consider, and the fatigue life is easily influenced by inclusions and decarburized layers are successfully solved, the final product still has excellent impact toughness and extremely long fatigue life when the tensile strength reaches the ultra-high strength level of 1900 MPa or above, the comprehensive performance is remarkably superior to that of an existing product, and the production cost is reduced. And the harsh requirements of automobile light weight on high-performance spring materials are met.

This invention belongs to the field of iron and steel metallurgical technology, specifically a high-purity IF steel production process. It employs a dual-control system of RH+VD (Reverse Hydrogenation and Vapor Deoxidation). RH is used for decarburization of the molten steel. After RH degassing, a top slag modifier is added, and the steel is then fed into a VD furnace for bottom-blown hydrogen deoxidation and alloying. No deoxidizing alloys are used during this process. This invention separates decarburization and deoxidation, avoiding the safety hazards caused by the coexistence of hydrogen and oxygen. It also utilizes stronger molten pool stirring for efficient pre-deoxidation of the top slag, while bottom-blown reducing gas deoxidation not only reduces oxygen content but also avoids the risk of secondary oxidation of the molten steel by the slag. Furthermore, the degassing capacity of the VD furnace removes residual hydrogen and nitrogen. This invention reduces safety hazards, improves the cleanliness of the molten steel, and increases alloy yield, thus achieving the production of high-purity IF steel.

The invention discloses a system and method for gasification device, gas-based shaft furnace and electric furnace coupling steelmaking, and belongs to the technical field of ferrous metallurgy. The invention provides a system for gasification device, gas-based shaft furnace and electric furnace coupling steelmaking. The system comprises a pretreatment device, a conveying device, a gasification device, a heat exchange device, a gas-based shaft furnace device, an electric furnace device and a decarburization device. The system is an integrated coal gasification and gas-based shaft furnace system, it is ensured that synthesis gas (mainly including CO and H2) generated by the coal gasification furnace is directly supplied to the shaft furnace, no extra device needs to be added for heating, and energy loss in the intermediate transmission process is reduced by optimizing the technological process. The invention aims to realize efficient coupling of coal gasification, the gas-based shaft furnace and the electric furnace by optimizing the system flow, improving the energy utilization efficiency and reducing the production cost.

The invention belongs to the technical field of coal gangue refined comprehensive utilization, and particularly relates to a process for preparing aluminum oxide by coal gangue decarburization activation acid leaching, which comprises the following steps: multi-stage activation, circular salt separation, catalytic alkalization, directional crystallization, oxygen-controlled roasting, magnetic separation impurity removal, flue gas reuse and the like. Efficient extraction of aluminum and deep removal of impurities in the coal gangue are achieved, and the final product aluminum oxide is high in purity, low in impurity content and fine and uniform in granularity and meets the metallurgical-grade aluminum oxide standard. The invention provides an industrial feasible scheme for high-value utilization of the coal gangue.

The invention relates to the technical field of adsorption, in particular to a device and process for coupling pressure swing adsorption carbon capture and gas combustion waste heat utilization, the device comprises a temperature swing adsorption pretreatment unit and a pressure swing adsorption unit, the temperature swing adsorption pretreatment unit is used for adsorbing and removing impurity components in blast furnace gas, and the pressure swing adsorption unit is used for adsorbing and removing the impurity components in the blast furnace gas; then, high-purity CO2 product gas is obtained through a pressure swing adsorption unit; the residual decarbonized coal gas adsorbed by the pressure swing adsorption unit is converted into high-temperature flue gas, and then the high-temperature flue gas enters the temperature swing adsorption pretreatment unit again for heat recovery, and meanwhile, the heat is utilized to desorb impurity components of the adsorbed blast furnace gas. According to the invention, blast furnace gas pretreatment and a CO2 capture system are combined, so that the recycling of blast furnace gas and the efficient capture of CO2 are realized, the capture efficiency of CO2 is improved, the energy waste is reduced, and the cyclic operation of equipment is realized.

The invention relates to a method for recycling valuable resources from a waste lithium iron phosphate material, and belongs to the technical field of recycling of waste lithium iron phosphate batteries. The method comprises the following steps: dispersing a waste lithium iron phosphate material in water to obtain a mixture I; respectively adding an acid solution and an oxidant solution into the mixture I at the same time to carry out leaching reaction, and carrying out solid-liquid separation to obtain a leaching solution A and active ferrophosphorus slag; iron powder and the leachate A are subjected to a replacement reaction to recover copper in the leachate A, and copper sponge and lithium-rich leachate are obtained; and calcining the active ferrophosphorus slag for crystal transformation to obtain decarbonized ferrophosphorus slag, the decarburized ferrophosphorus slag is mixed with alkali liquor, the mixture is placed in a mill to be subjected to ball-milling leaching, and leachate B and ferric hydroxide are obtained; and adjusting the pH value of the leachate B to be alkaline to obtain an aluminum hydroxide and phosphate solution. The method provided by the invention is simple to operate and low in cost, has good economic benefits and is easy for industrial application.

The invention discloses a spheroidizing-annealing-free SWRCH35K cold heading steel wire rod based on hot machine rolling and a production method of the spheroidizing-annealing-free SWRCH35K cold heading steel wire rod. The cold heading steel wire rod comprises the chemical components of C, Si, Mn, P, S, Als, Cr, Ni, Cu, Mo, V and the balance Fe and inevitable impurities. The production method comprises the steps of 130-ton combined blown converter smelting, LF furnace refining, continuous casting, casting blank heating, heat engine rolling, reducing first and second unit rolling, spinning, air cooling line rolling, finishing and packaging and warehousing. The plastic extension strength Rp0.2 of the produced cold heading steel wire rod is 356-408 MPa, the tensile strength is 546-583 MPa, the percentage elongation after fracture is 26-31%, the percentage reduction of area is 62-73%, no complete decarburization layer exists, the total decarburization layer depth is 0.02-0.04 mm, the cold heading steel wire rod has good drawing machining performance and good surface quality, the obtained wire rod structure is spheroidized ferrite and pearlite structures, and the cold heading steel wire rod is suitable for being used as a cold heading steel wire rod. And the heat treatment procedure of subsequent spheroidizing annealing of a traditional cold heading steel wire rod is omitted, the production cost of subsequent machining is greatly saved, and the market competitiveness of products is improved.

The invention belongs to the technical field of blast furnace decarburization systems, and particularly discloses a hydrogen-rich carbon circulating blast furnace top gas carbon dioxide capture solution vacuum phase change regeneration system which comprises an absorption tower, a flash tank and a regeneration tower, the bottom and the top of the absorption tower are communicated with a top gas pipe and an ammonia liquid inlet pipe respectively, and a decarburized gas outlet pipe is arranged at the top of the absorption tower; a bottom outlet of the flash tank is communicated with a regeneration tower through a pipeline; a bottom outlet of the regeneration tower is communicated with an evaporator; one side of the evaporator is communicated with a vacuum pipe; one end of the vacuum pipe is communicated with a vacuum phase change direct heating machine; and a cooling unit for cooling the vacuum tube is arranged outside the vacuum tube. The problems that a traditional amine liquid regeneration method is low in regeneration efficiency and high in energy consumption are solved. By combining vacuum flash evaporation, the regeneration efficiency of the amine liquid is remarkably improved, meanwhile, energy consumption and amine liquid loss are reduced, and the purpose of low-carbon metallurgy is achieved.

The utility model discloses an ammonia-ammonium chloride catalysis system for decarburization of steel slag solid waste and flue gas, and belongs to the technical field of ferrous metallurgy. The ammonia-ammonium chloride catalysis system for steel slag solid waste and flue gas decarburization comprises a steel slag dissolving tank, an ammonia gas condensation cooler and a decarburization tower which are sequentially connected, the top of the decarburization tower is sequentially connected with an ammonia recovery system, an impurity filtering system and a calcium carbonate extraction system, and the bottom of the decarburization tower is connected with the calcium carbonate extraction system. The calcium carbonate extraction system is connected with the steel slag dissolving tank, and the steel slag dissolving tank is communicated with the ammonia recovery system. According to the technical scheme, the purpose of carbon capture and high-added-value resource reutilization of the steel slag are achieved.

The invention relates to the technical field of vanadium extraction from stone coal, in particular to a method for extracting vanadium and molybdenum from stone coal vanadium ore. The method comprises the following steps: carrying out decarburization roasting and sodium salt roasting on a stone coal vanadium ore grinding sample; immersing into a sulfuric acid solution for acid leaching, and separating acid leaching liquid and acid leaching residues after acid leaching; a trihexyl (14) phosphonyl chloride organic solution in a proper concentration range is used as an extracting agent for an acid leaching solution, and step-by-step selective extraction is realized by utilizing the remarkable difference of extraction behaviors of molybdenum and vanadium under different pH values; preferably selecting the concentration of the sulfuric acid solution to efficiently strip molybdenum and vanadium in the organic phase respectively; carrying out ammonia leaching on the acid leaching residues to extract residual molybdenum; and carrying out molybdenum precipitation and vanadium precipitation reaction, and calcining to obtain vanadium and molybdenum fine powder products. According to the method, efficient collaborative recovery of vanadium and molybdenum is achieved, the purity of the obtained vanadium and molybdenum fine powder product is extremely high, the high-end application requirement is met, and the method has important industrial application value.

The invention discloses a system and a method for preparing kaolin by calcining and whitening coal gangue, the system comprises a preheater, a calcining furnace, a heat preservation bin and a cyclone cooling unit which are communicated in sequence, a blanking pipe of a penultimate cyclone separator of the preheater is connected with the calcining furnace, a combustor is arranged on the calcining furnace, and the cyclone cooling unit is connected with the calcining furnace. A discharging pipe of the cyclone separator at the bottom end of the preheater is connected with the calcining furnace and the heat preservation bin respectively; the cyclone cooling unit comprises a first cooling unit and a second cooling unit; a discharging port of the heat preservation bin is connected with a feeding port of the first cooling unit, and a discharging port of the first cooling unit is connected with a feeding port of the second cooling unit. The decarburization time is prolonged by adopting calcining furnace material circulation and a heat preservation bin, so that carbon in the coal gangue is completely removed, the whiteness of the kaolin product is further improved, the production line is energy-saving and emission-reducing, the product quality is stable, the process flow and equipment are simple, carbon emission reduction is realized, the production line is suitable for large-scale industrial production, the cost is reduced, and the cost performance is high.