1889 results about "Decarburization" patented technology

The invention relates to the technical field of coal gangue, in particular to a process for preparing high-strength lightweight aggregate from high-calorific-value coal gangue, which comprises a drying link, a pyrolysis link, a decarburization link, a sintering link and a cooling link, and is characterized in that wet coal gangue pellets are sequentially subjected to drying, pyrolysis, decarburization and cooling to obtain water-retaining ceramsite; sequentially drying, pyrolyzing, decarbonizing, sintering and cooling the wet coal gangue pellets to obtain the high-strength ceramsite. High-temperature hot air of the cooling link is introduced into the sintering link, low-temperature hot air of the cooling link is introduced into the decarburization link, and tail gas of each link serves as high-temperature flue gas to be recycled towards the front link, so that the overall energy consumption of a process production line is reduced; in the pyrolysis link, gas separated out of the coal gangue is collected and serves as fuel to be introduced into the sintering kiln, so that the whole production line does not need additional energy input, in addition, the carbon content in the ceramsite is effectively reduced through pyrolysis and decarburization, and the product quality is improved.

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 belongs to the technical field of waste gas treatment, particularly relates to a dust removal, desulfurization and decarbonization absorption and desorption device for ship tail gas and a use method of the dust removal, desulfurization and decarbonization absorption and desorption device, and aims to overcome the defects that in the prior art, when gas is treated, the gas cannot be detected and cannot be secondarily treated. A first treatment tank and a second treatment tank are fixedly mounted at the top of the base, the first treatment tank is located on one side of the second treatment tank, a first mounting cover is fixedly mounted on the inner wall of the top of one side of the first treatment tank, one side of the first mounting cover extends to the outer side of the first treatment tank, and one side of the first mounting cover fixedly communicates with an air connecting pipe; after the gas is treated, the treated gas can be detected, and if the treated gas does not reach the emission standard, the gas can be subjected to secondary treatment, so that the quality of the discharged gas reaches the emission standard.

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.

The utility model discloses a steel decarburized layer depth measuring device convenient to maintain, and particularly relates to the technical field of metal material detection, the steel decarburized layer depth measuring device convenient to maintain comprises a base, a box body is arranged at the top of the base, a transverse and vertical position adjusting assembly is arranged at the top in the box body, and a motor is connected to the bottom of the transverse and vertical position adjusting assembly. Then a handle is rotated to drive a torsion rod to rotate, so that a plurality of arc rods are synchronously driven to move out of a through groove, then a connecting disc is pulled to be separated from the output end of a motor, a cutting knife can be disassembled and replaced, equipment maintenance is facilitated, meanwhile, the arc rods can be limited through use of convex columns, and the fixing effect on the cutting knife is improved; the fixing effect is prevented from being influenced by centrifugal force, and the practicability is higher; by means of the water spraying cleaning assembly, water spraying can conduct water-cooling flushing on the cutting knife, and meanwhile potential energy of water flowing is converted into mechanical energy for driving the cleaning brush to rotate, so that the situation that the filtering effect of the filter screen is affected due to accumulation and blockage of waste chips is avoided.

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.

vertical regenerative parallel-flow kiln comprising at least two vessels (1,2) interconnected by a gas transfer channel (3), each vessel comprising, in the in-service or out-of-service position, a loading inlet (5) for carbonate mineral rock at the top of the vessel, means for firing the rock, a discharge outlet (8) for the decarbonated calcined material produced at the bottom of the vessel, a cooling air inlet (7) at the bottom of the vessel for counter-cooling the calcined material produced, and a central collecting element (21) having, at its upper end, a collection opening (24) for the cooling air heated by the calcined material and, at its lower end, an extraction outlet (22), each vessel further comprising a protective cap-shaped element (25) which is fixed in the vessel in a position independent of the central collecting element (21),by covering and surrounding its upper end down to a level lower than the harvest opening (24), so as to leave, between this upper end and the cap (25), a free passage for the collection of heated cooling air through the harvest opening (24).

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 discloses a processing technology of solid waste coal gangue powder, which comprises the following steps: S1, crushing and grinding coal gangue to obtain coal gangue powder; s2, coal gangue powder enters a preheater through a feeder and then enters a heat treatment furnace to be subjected to high-temperature heat treatment, small-particle-size powder enters a cyclone powder collector along with high-temperature gas to be collected, powder is obtained after cooling, and other-particle-size powder is discharged out of the heat treatment furnace through an overflow opening to be collected. Heat energy of the coal gangue is utilized, natural gas is matched for auxiliary combustion, the coal gangue powder can be rapidly dehydrated, decarbonized, activated and whitened in a high-temperature fluidization state, the production period is short, the quality is stable, and high efficiency and energy conservation are achieved. The prepared powder can be respectively used in the fields of cement, ceramics, electroceramics, glass fibers and the like through coal gangue raw material selection and heat treatment temperature regulation and control, the market popularization value is high, and the application prospect is wide.

The invention discloses a preparation method of high-magnetic-induction oriented silicon steel, which comprises the following steps: sequentially heating, roughly rolling, finely rolling and coiling a plate blank obtained by continuously casting qualified molten steel to obtain a hot-rolled coil; the hot-rolled coil is sequentially subjected to normalizing treatment and cold rolling, and a cold-rolled sheet is obtained; the cold-rolled sheet is sequentially subjected to decarburization and nitriding, and the high-magnetic-induction oriented silicon steel is obtained; in the nitriding process, the nitriding temperature is 910-980 DEG C, and the dew point is 10-60 DEG C. A 910-980 DEG C high-temperature nitriding method is adopted, the diffusion efficiency of N atoms in the steel strip is improved, the uniformity of the N concentration in the thickness direction is improved, the secondary recrystallization quality and the thickness consistency of a magnesium silicate bottom layer can be improved, meanwhile, the heating rate can be properly increased during high-temperature annealing, and the high-temperature annealing time is shortened.

The invention belongs to the technical field of quartz sand, and discloses a roasting method for controlling the pore defect of quartz sand and increasing the stacking density, which comprises the following steps: 1) drying silicon dioxide gel prepared by a sol-gel method to obtain silicon dioxide powder; (2) the silicon dioxide particles are placed in a roasting furnace, the furnace temperature is preheated to 400-700 DEG C after vacuumizing is conducted, then the furnace is maintained in a vacuum environment for a period of time, then oxygen-containing atmosphere is filled into the furnace and maintained for a period of time, the vacuum environment and the oxygen-containing atmosphere environment are alternately conducted, and sufficient decarburization is achieved; and (3) vacuumizing again, raising the furnace temperature to 1100-1300 DEG C, maintaining for a period of time in a vacuum environment, filling inert gas into the furnace, maintaining for a period of time, alternately vacuumizing and filling the inert gas, and sintering the quartz sand. According to the method, preheating is performed for sufficient decarburization, then high-temperature sintering is performed, the finally obtained quartz sand does not have obvious air holes, and the bulk density is larger than or equal to 1.3 g / cm < 3 >.

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 invention discloses a collaborative flotation enrichment method for metal lithium gallium and kaolinite in coal gangue, belongs to the technical field of coal series metal enrichment and extraction, and aims to solve the problems of difficulty in physical separation and enrichment and low separation efficiency of coal series metal lithium gallium in the prior art. The method comprises the following steps: roughing coal gangue in advance, and removing part of carbon-containing minerals to obtain a roughed material; ore grinding is conducted on tailings obtained after roughing, and materials obtained after ore grinding are obtained; decarburization flotation is conducted on the ground materials, and decarburization flotation materials are obtained; carrying out pyrite removal flotation on the decarburized and floated material to obtain a pyrite-removed and floated material; and performing quartz removal flotation on the material subjected to pyrite removal flotation. The method can be used for collaborative flotation enrichment of lithium gallium and kaolinite in coal gangue.

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 present invention concerns a method of decarbonating a gas stream containing from 15% to 60% carbon dioxide, by passage of the said gas stream over a zeolitic agglomerate comprising at least one binder and at at least one zeolite, and having a mesoporous volume of between 0.02 cm3·g−1 and 0.15 cm3·g−1 and a mesoporous volume fraction of between 0.1 and 0.5, preferably between 0.15 and 0.45.

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 relates to a preparation method of AnO2 type MOX fuel powder, which comprises the following steps: preparing a mixed actinide eutectic melt from a mixed actinide salt and a urea solid, and carrying out deamination and denitrification / decarbonization on the mixed actinide eutectic melt to directly obtain the AnO2 type MOX fuel powder, the mixed actinide salt consists of tetravalent actinide nitrate and tetravalent actinide oxalate; when the tetravalent actinide nitrate is a plutonium nitrate pentahydrate solid, a thorium nitrate hexahydrate solid or a U (NO3) 4.3-4H2O solid, and the tetravalent actinide oxalate is a thorium oxalate hexahydrate solid, a plutonium oxalate hexahydrate solid or an oxalic acid U (IV) solid, the AnO2 type MOX fuel powder is (ThxPu1-x) O2, (UxTh1-x) O2 or (UxPu1-x) O2 powder. According to the preparation method, plutonium nitrate / thorium nitrate / U (NO3) 4. 3-4H2O and thorium oxalate / plutonium oxalate / oxalic acid U (IV) are directly adopted as raw materials, the preparation process flow of the AnO2 type MOX fuel powder can be simplified, the use of process reagents is reduced, and no process waste liquid is generated, so that the preparation method of the MOX fuel powder, which is simple, convenient, high in production efficiency, free of waste liquid and more economical and green, is provided.

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 discloses a top slag modification process for ultra-low carbon steel, and belongs to the field of converter and refining technology. In the modification process of the invention, when the converter is tapping steel, carbon powder, lime, medium carbon ferromanganese and aluminum particles are added to perform the first step of modification, and a certain oxidizability of the top slag is retained; during the RH decarburization process, the top slag is used to transfer oxygen to the molten steel to achieve the second step of modification; and after the RH treatment is completed and the air is broken, aluminum particles are added to perform the third step of modification. The invention performs the modification in stages and reasonably controls the oxidizability of the ladle top slag, so that the oxidizability of the top slag is utilized as a resource. In the control process of the whole process, a large amount of instantaneous smoke and dust will not be generated, which is environmentally friendly and the modification is accurate. After the RH air is broken, the T.Fe of the top slag is ≤8%, and the CaO / Al2O3 is in the range of 1.3-1.8. Compared with the traditional top slag modification process, low-cost, low-pollution and more accurate top slag modification is achieved.

The invention discloses a converter smelting method using direct reduced iron, which comprises the following steps of: (1) adding the direct reduced iron into a converter along with scrap steel according to the adding amount of 10-150kg / t; (2) carrying out blowing operation; the lance position of an oxygen lance for blowing for 0-5 min is 1500-2200 mm, the added coolant is less than or equal to 15 kg / t, and the slag former is less than or equal to 60 kg / t; the lance position of an oxygen lance for blowing for 5-10 minutes is 1700-2500mm, the added coolant is less than or equal to 30kg / t, and the slag former is less than or equal to 20kg / t; the lance position of an oxygen lance after blowing for 10 minutes is 1300-2000 mm, the added coolant is less than or equal to 10 kg / t, and the slag former is less than or equal to 10 kg / t. According to the method, the direct reduction iron is added into the converter along with the waste steel, and by controlling the adding amount and the smelting process, it is guaranteed that decarburization and temperature rising reactions in the converter are normally carried out, and the abnormal conditions such as dry returning and waste steel non-melting are avoided. After the method is adopted, the converter blowing process is stable, the dry returning and splashing conditions are avoided, the scrap steel is completely molten, and smooth converter smelting is effectively guaranteed while the carbon emission of the whole process is reduced.

The invention relates to the technical field of metal heat treatment, in particular to a quenching process for improving the surface quality of a plate spring and reducing oxidation and decarburization, which comprises the following steps: putting the plate spring into a heating furnace, accelerating heating to 900-100 DEG C, and keeping the temperature for 30-35 minutes; the heated plate spring is placed in a quenching machine to be clamped and quenched; the tempering temperature is selected according to the hardness value required by the plate spring, and a continuous or periodic operation tempering furnace is adopted for tempering treatment; and the plate spring is relaxed, loaded, heated and subjected to heat preservation. By accurately controlling the heating temperature and time and combining the intelligent temperature control system to optimize the heating process, it is ensured that the plate spring is evenly heated within the optimal temperature range. In this way, the surface quality of the plate spring is improved, the performance difference caused by uneven heating is reduced, the oxidation and decarbonization phenomena are effectively reduced, the service life of the plate spring is prolonged, and the overall performance of the plate spring is improved.