98results about How to "Reduce yield" patented technology

The invention relates to a method for producing high-octane gasoline through hydrocarbon catalytic cracking and a reaction system thereof, and the method comprises the following steps: in a constant linear velocity fluidized bed reactor, diesel oil and other light petroleum hydrocarbons are contacted with a high silica-alumina ratio catalytic cracking catalyst, and self-heat balance is maintained through regeneration flue gas circulation to produce liquefied gas and high-octane gasoline. According to the method disclosed by the invention, heavy oil such as naphtha, wax oil and residual oil can be processed while light hydrocarbon such as diesel oil is processed, the conversion rate of the diesel oil is high, self-heating balance can be realized, the problem of excessive diesel oil production capacity of a refinery plant is solved, and the processing benefit of crude oil is also improved.

The invention provides a direct ammoxidation coupled autotrophic denitrification sewage treatment method and a bioreactor. The sewage treatment method by coupling direct ammonia oxidation with autotrophic denitrification comprises the following steps: sewage enters a continuous flow bioreactor, the bioreactor comprises a first-stage aerobic section, a second-stage anoxic section and a third-stage aerobic section which are arranged in sequence, a direct ammonia oxidation microbial agent is put into the first-stage aerobic section, and the third-stage aerobic section is put into the second-stage anoxic section; a ferrous sulfide autotrophic-heterotrophic denitrification filler is put into the second-stage anoxic section; the sewage comprises high-ammonia-nitrogen low-carbon-nitrogen-ratio wastewater; sewage staying in the third-stage aerobic section enters a secondary sedimentation tank and then is discharged. According to the method, no additional carbon source is needed, the sludge yield is low, and green, low-carbon and efficient treatment of the high-ammonia-nitrogen and low-carbon-nitrogen-ratio wastewater is realized.

The invention discloses a purification method and a purification device for crystallized magnesium, and relates to the field of magnesium metal smelting. The method comprises the following steps: under the protection of an inert atmosphere, firstly carrying out pressure-applying melting treatment on a magnesium material to be smelted, and then carrying out pressure-applying filtering treatment on a product obtained after the melting treatment, so as to complete the flux-free smelting process of the magnesium material. And meanwhile, the metal magnesium liquid and most of the oxide shells are separated by utilizing the liquidity difference between the liquid metal magnesium and the solid oxide shells. Compared with a conventional smelting process without pressure application, the method has the advantages that the melting rate of the crystallized magnesium can be remarkably increased, most of oxide impurities are removed, a series of pollution problems caused by flux use are solved from the source, and low-cost, high-efficiency and high-quality smelting of the crystallized magnesium is realized.

The utility model relates to a feeding and discharging device for spline shaft machining, which comprises a mechanical arm and a feeding device, the mechanical arm is arranged on one side of the feeding device, the feeding device comprises a first storage cabinet and a second storage cabinet, and the top of the first storage cabinet and the top of the second storage cabinet are both provided with discharging holes. Automatic feeders are arranged in the first storage cabinet and the second storage cabinet, each automatic feeder comprises a rotating shaft, a conveying belt and a servo motor, a plurality of containing grooves are evenly formed in the surface of the conveying belt at equal intervals, the servo motors are arranged at the top end in the first storage cabinet, and the rotating shafts are in transmission connection with output shafts of the servo motors through couplings; the two ends of the rotating shaft are sleeved with discs, and a plurality of containing holes are evenly formed in the discs in the axial direction. The containing holes of the discs can be matched with the electromagnets to descend the shaft parts conveyed by the conveying belt to be attracted to the rotating shafts, the containing grooves in the conveying belt can prevent the shaft parts from rolling during conveying, and the parts can be automatically fed.

The invention provides a method for eliminating delta ferrite in austenitic stainless steel and the austenitic stainless steel, and belongs to the technical field of metal materials. The method comprises the following steps that an austenitic stainless steel ingot containing the delta ferrite is subjected to heat preservation for first set time at the first set temperature for first heat treatment; heating the austenitic stainless steel ingot subjected to the first heat treatment to a second set temperature, and carrying out heat preservation for a second set time at the second set temperature for second heat treatment; and cooling the austenitic stainless steel ingot subjected to the second heat treatment, or sequentially and repeatedly carrying out the first heat treatment and the second heat treatment on the austenitic stainless steel ingot subjected to the second heat treatment for at least one time, and then cooling to obtain the austenitic stainless steel subjected to delta ferrite elimination. The first heat treatment and the second heat treatment are performed, and the second set time is limited, so that the austenitic stainless steel is prevented from being in a high-temperature environment for a long time, and austenite grains are prevented from obviously growing.

The invention belongs to the technical field of environmental protection and new energy, and discloses a cobalt-containing aerogel-loaded ruthenium monatomic catalyst as well as preparation and application thereof. The preparation method comprises the following steps: preparing cobalt-containing aerogel through a chemical precipitation method, preparing a ruthenium monatomic catalyst through a heat treatment method, uniformly grinding the cobalt-containing aerogel and the ruthenium monatomic catalyst, and carrying out heating treatment in an air atmosphere to obtain the cobalt-containing aerogel loaded ruthenium monatomic catalyst. The noble metal ruthenium in the obtained catalyst exists in a monatomic form, the content of the ruthenium metal is low, and the cobalt-containing aerogel has a special sheet structure. The material can expose a large number of catalytic active sites due to the special structure of single atoms and the larger surface area of aerogel. The obtained catalyst shows excellent catalytic activity and stability in an electro-catalysis nitrate reduction reaction.

The present invention provides a transfer film and its application, wherein the transfer film can be used for mass transfer of Mini LED and / or Micro LED. The transfer film of the present invention comprises a substrate and an acrylic adhesive layer and a debonding adhesive layer arranged on both sides of the substrate, and the debonding adhesive layer is used to bond with Mini LED and / or Micro LED. The transfer film of the present invention uses a debonding adhesive layer to achieve reversible adhesion to Mini LED and / or Micro LED, and the debonding adhesive layer can adhere to Mini LED and / or Micro LED with a size of less than 50 μm, which solves the problem that the vacuum suction device in the traditional process cannot effectively adsorb Mini LED and / or Micro LED with a size of less than 50 μm. At the same time, it is simple to use and low in cost, and does not require the addition of complex processes or expensive instruments. The debonding adhesive layer can be firmly adsorbed with Mini LED and / or Micro LED under normal conditions, but after the debonding treatment, the bonding force between the debonding adhesive layer and Mini LED and / or Micro LED is significantly reduced, so that the transfer film can be detached from Mini LED and / or Micro LED without taking away Mini LED and / or Micro LED.

The invention discloses a tailing-free treatment method for flotation tailings of a metal mine, which comprises the following steps: adding oxalic acid into ore pulp of the flotation tailings of the metal mine to adjust the pH value of the ore pulp, and then adding butyl xanthate and terpenic oil for sulfur roughing; performing blank concentration on a foam product obtained by sulfur roughing for three times to obtain sulfur concentrate; the method comprises the following steps: performing low-intensity magnetic separation on sulfur separation tailings obtained by sulfur roughing, performing sedimentation desliming on the tailings obtained by low-intensity magnetic separation to obtain micron-sized fine silt and a crude product, performing roughing on the crude product for five times, adding an adjusting agent of oxalic acid and 2-hydroxypropane-1, 2, 3-tricarboxylic acid combination, lauryl amine and sodium oleate in each time of roughing, blank concentration is conducted on a foam product 1 obtained through first-time roughing to obtain feldspar concentrate 1, foam products and micron-sized fine silt obtained through subsequent roughing are filtered and dried to obtain feldspar concentrate 2, and after fifth-time roughing is finished, ore pulp is filtered and dried to obtain quartz concentrate. The problem of land and environment damage caused by tailing stockpiling can be solved, and tailing resource utilization is achieved.

The invention provides a combined process method for improving the yield of vacuum residue catalytic cracking products, which comprises the following steps: determining the asphaltene dispersion coefficient d of vacuum residue according to a formula (1), where w asphaltene, w colloid and w aromatics respectively represent the mass fractions of asphaltene, colloid and aromatics in vacuum residue; and carrying out modification and catalytic cracking reaction on the vacuum residue. According to the combined process method, the asphaltene dispersion coefficient d is ingeniously designed, and d is smaller than or equal to 0.5 and dgt; the vacuum residue of which the content is 0.5 is modified by adopting different modification methods, and then catalytic cracking reaction is performed under different conditions, so that the density of a catalyst in a reactor is improved, oil-agent contact in the reactor is improved, the contact instantaneous effective agent-oil ratio can be improved, the catalytic cracking reaction ratio can be remarkably improved, thermal cracking and condensation coke generation reactions are reduced, and the catalytic cracking efficiency is improved. Conversion of inferior heavy oil is promoted, meanwhile, the coke yield is remarkably reduced, and the yield of high-value products is increased.

The invention discloses a preparation method of a peritectic steel large forged circle, and relates to the technical field of forged circle manufacturing, and the preparation method comprises the following steps: S1, molten steel pouring; s2, the red mold enters a slow cooling pit for heat preservation; s3, digging out of the pit; step S4, surface cleaning; s5, steel ingot preheating; s6, forging and forming; and S7, heat treatment. The peritectic steel large forged circle manufactured through the manufacturing method of the peritectic steel large forged circle is few in surface crack, high in black skin yield and large in yield strength.

The invention provides a siloxane-based perfluoropolyether anti-discoloration and anti-fingerprint coating and a preparation method thereof. The method comprises the following steps: adding a metal cyanide catalyst into a reaction kettle; adding perfluoroalkylene oxide and perfluoroether glycol into the reaction kettle under the condition of nitrogen, and reacting for a first time at a first temperature to obtain a perfluoropolyether intermediate; and adding a phase transfer catalyst and (3-chloropropyl) triethoxysilane into the perfluoropolyether intermediate under an alkaline condition, reacting for a second time at a second temperature to obtain siloxane perfluoropolyether, and preparing the anti-discoloration anti-fingerprint discoloration coating through the siloxane perfluoropolyether. The siloxane perfluoropolyether is prepared through a preset scheme, the cost is low, the yield is high, separation treatment is easy, and the anti-discoloration and anti-fingerprint coating prepared from the siloxane perfluoropolyether has the advantages of being good in water resistance, oil resistance and friction resistance, capable of keeping the color of a membrane material and the like.

The invention discloses a die casting integrated production and manufacturing method and device. The method comprises the steps that a die casting is divided into a plurality of areas according to a preset rule, each area is independently produced through low-pressure casting equipment, the multiple low-pressure casting equipment synchronously operates for production, and a middleware is formed at a time; and defects on the middleware are trimmed through a material reducing machining method, and the die casting is obtained. The device comprises a plurality of low-pressure casting devices corresponding to a plurality of areas divided by a die casting according to a preset rule, and a liquid supply pipe, wherein a plurality of branch pipes connected with the low-pressure casting devices are arranged on the liquid supply pipe; each low-pressure casting device comprises a lower die assembly and an upper die assembly which are oppositely arranged, and the problems that an ultra-large die casting machine is high in manufacturing cost, long in manufacturing period, high in maintenance cost, long in maintenance time and high in production efficiency can be solved. The problems that an integrated die-casting process is blocked, die cost is high, die maintenance is difficult, die maintenance cost is high, die service life is short, heat-treatment-free aluminum alloy materials do not exist, and the yield is low are solved.

A hydrochloric acid oxidation catalyst oxidizes hydrochloric acid. The hydrochloric acid oxidation catalyst includes a carrier, and copper, an alkali metal, and a rare earth element that are carried by the carrier. A differential value of a spectrum obtained by differential thermal analysis of the hydrochloric acid oxidation catalyst is 0.035 µV / sec or less relative to a baseline in the range of 290 to 400°C.

The application discloses a functional sugar conversion enzyme and application. The functional sugar conversion enzyme enhances catalytic activity and thermal stability at 70 DEG C, and meanwhile, improves conversion efficiency of the functional sugar. The application has the operation advantages of green controllability, high product yield and low byproduct content, and has significant industrial application value.

A battery includes an electrode assembly. The electrode assembly includes a first electrode including a first portion and a first tab extending from the first portion, a separator laminated on the first electrode, and a second portion and a second tab extending from the second portion, and a second electrode laminated on the separator. The battery further includes a current collector assembly including a plate, a first current collector coupled to a proximal end of the plate and including a first part and a second part opposite to the first part, and a second current collector coupled to a distal end of the plate and including a third part and a fourth part opposite to the third part. The battery may further include a housing coupled to the plate. The first and second parts of the first current collector may be configured to move in opposite directions.

The invention discloses a narrow half-peak width platinum complex phosphorescent material based on regulation and control of charge density of coordination carbon atoms of a coumarin skeleton and a preparation method thereof, the structural general formula of the material is # imgabs0, regulation and control of the charge density of the coordination carbon atoms can be realized by a CN chelating ligand isomer synthesized by the coumarin skeleton, so that adjustment of MLCT components in an emission spectrum of a platinum complex is realized, and a narrow emission half-peak width and a wide emission spectrum are obtained. The requirement of the current BT.2020 wide color gamut is better met, and a core light-emitting material is provided for an OLED to meet ultrahigh-strength display; dual regulation and control of the emission color and the emission half-peak width of the platinum complex are achieved by regulating and controlling the charge density of coordinated carbon atoms in the coumarin-containing skeleton ligand, the variety of coordinated nitrogen heterocycles is further changed, comprehensive coverage from blue light to near-infrared emission color is achieved, the skeleton containing carbon, oxygen and hydrogen has high stability and rigidity, and the coumarin-containing skeleton ligand can be applied to the field of organic light emitting devices. The compound is an ideal skeleton for developing a practical high-performance narrow-half-peak-width platinum complex phosphorescent material, and has the characteristics of simple synthesis and easy functionalization.

The invention provides an unnatural amino acid, which is a compound with a structure as shown in formula (I) or an enantiomer thereof. The invention further provides use of the unnatural amino acid. Furthermore, the invention further provides a recombinant protein containing the unnatural amino acid and a protein conjugate prepared from the recombinant protein. The unnatural amino acid provided by the invention is simple and convenient to prepare, safe in nature, not easy to be inactivated when being inserted into a protein, and has a high binding rate with a coupling moiety, and the obtained conjugate is higher in stability. The unnatural amino acid provided by the invention is applicable to numerous fields, especially in preparation of a recombinant protein or a recombinant protein conjugate,

The invention discloses a fly ash reduction processing device for a circulating fluidized bed boiler, aiming to provide a fly ash reduction processing device for a circulating fluidized bed boiler, which can timely discharge the ash at the bottom of the returner without affecting the normal operation of the returner of the circulating fluidized bed boiler, thereby reducing the fly ash yield. The device comprises an ash discharge port, which is arranged at the bottom of the returner of the circulating fluidized bed boiler; an ash discharge pipe; an intermittent ash discharge opening and closing device, which comprises a reset spring, a switching cylinder with closed upper and lower ends, a vertical upper cylinder arranged at the upper end of the switching cylinder, an upper piston for cooperating with the vertical upper cylinder, a vertical lower cylinder arranged at the lower end of the switching cylinder, a lower piston for cooperating with the vertical lower cylinder, a vertical connecting rod connecting the upper piston and the lower piston, an ash receiving plate arranged in the switching cylinder through a horizontal rotating shaft, the upper end of the ash discharge pipe is connected to the ash discharge port, and the lower end of the ash discharge pipe is connected to the upper end of the vertical upper cylinder.

The utility model provides a multi-station rotating horizontal pressing mechanism which comprises a mechanism body, a controller, an indexing material rotating mechanism and a material pressing assembly are arranged on the mechanism body, a tray assembly is arranged on the indexing material rotating mechanism, a station carrier is arranged on the tray assembly, and the station carrier is arranged on the material pressing assembly. The indexing material rotating mechanism can move the multiple sets of station carriers to the position below the material pressing assembly one by one, and the material pressing assembly is used for pressing materials in the station carriers. By the adoption of the mechanism, the problems that in the prior art, fatigue is prone to occurring in the press fit mode of machining personnel, and the press fit efficiency is low can be effectively solved, materials are placed in the station carrier through the equipment, then the materials are transferred to the position below the material pressing assembly through the indexing material rotating mechanism, the material pressing assembly conducts material pressing, and the machining efficiency is improved. Compared with the prior art, the working intensity of processing personnel is effectively reduced, the standard and unified pressing can be ensured, the yield is effectively controlled, the pressing efficiency can be effectively improved through alternate cooperation of the multiple sets of station carriers, and the competitiveness of enterprises is improved to a certain extent.

The invention belongs to the technical field of conductive macromolecules, and particularly relates to a preparation method of high-conductivity PEDOT conductive powder. According to the preparation method, the alcohol-water mixed solvent is used for replacing a water solvent in a traditional preparation process, a suspension polymerization process is converted into a solution polymerization process, and the PEDOT conductive powder with excellent performance is obtained under the condition that no auxiliaries are added. The method has the characteristics of high efficiency and energy conservation, and the high-conductivity PEDOT powder is obtained by controlling the reaction raw material proportion and the reaction time at room temperature. Meanwhile, the product prepared by the process is good in stability and high in repeatability. Compared with a mainstream PEDOT commodity in the market at present, the PEDOT powder product has higher conductivity and processability.

The invention discloses a Cr-V system out-of-plane ordered double transition metal MAX phase material and a preparation method thereof, and belongs to the technical field of MAX phase materials.The preparation method comprises the steps that Cr2AlC powder and VC powder are mixed and ground to obtain mixed slurry, the mixed slurry is dried to obtain mixed powder, the mixed powder is subjected to cold press molding and then heated and calcined, and after the mixed powder is cooled to the room temperature, the Cr-V system out-of-plane ordered double transition metal MAX phase material is obtained; the Cr-V system out-of-plane ordered double-transition metal MAX phase material is obtained; the chemical formula of the Cr-V system out-of-plane ordered double transition metal MAX phase material is Cr2VAlC2 or Cr2V2AlC3, and the chemical formula of the Cr-V system out-of-plane ordered double transition metal MAX The mass fraction of the obtained Cr2VAlC2 is 74.9%, and the mass fraction of the obtained Cr2V2AlC3 is 90.1%. And the high-purity Cr2V2AlC3 material with the single MAX phase is prepared for the first time. The material can be further applied to the fields of electromagnetic wave absorption, electric contactors and the like, in the future, the two-dimensional out-of-plane ordered double-transition metal MXene material Cr2V2C3 can be further prepared through etching, and the application of the material in the related fields of energy storage, catalysis and the like is explored.

The utility model discloses a multi-functional hand-held device for bad fruit detection and picking relates to wisdom agriculture technical field, including hand-held rod and hinge, hand-held rod is two-section design, and hand-held rod two sections are hinged through antiskid sleeve, the inside of hand-held rod upper section is equipped with telescopic pole, and the hinge is equipped with the telescopic pole. The upper end of the telescopic rod is fixedly connected with a metal platform, and a camera is arranged above the metal platform. Through the arrangement of the camera and the arrangement of the electric scissors, when fruits are picked, the conditions of the fruits can be observed through the camera, the reasons of the damaged fruits can be comprehensively analyzed according to the shot content, and the picking efficiency of the fruits is improved. By arranging the electric scissors, the platycodon roots of the fruits are directly sheared, the fruit loss is avoided, the yield of the fruits is ensured, meanwhile, the labor intensity of workers can be reduced, and the subsequent screening of the bad fruits is easier.

This invention discloses a catalyst for the production of ethylene and propylene, its preparation method, and its applications. The catalyst comprises the following components: I) 1%–10% of chemical formula A x B y D z A compound of O4; in the chemical formula, the oxidation states of elements A, B, and D are m, n, and p, respectively, satisfying x·m + y·n + z·p = 8, where m, n, and p are integers not greater than 3; the A x B y D z O4 has a spinel structure; II) 0.5%–10% is selected from at least one oxide of rare earth elements, P, Mo, and W; III) 20.0%–55.0% is selected from at least one zeolite of ZSM-5 and ZSM-11; IV) 10%–30% is a binder; V) 25.0%–60.0% is clay. This catalyst is used in the catalytic cracking of petroleum hydrocarbons to produce ethylene and propylene, and features good catalyst stability, low methane yield, and high ethylene and propylene yields.

An optical fiber includes a core portion made of silica-based glass; and a cladding portion made of silica-based glass having lower maximum refractive index than the core portion, the cladding portion surrounding an outer periphery of the core portion. The core portion is doped with an alkali metal element and chlorine. An average concentration of chlorine is higher than 800 atomic ppm on a cross-section perpendicular to a longitudinal direction of the core portion. A region doped with the alkali metal element is larger than a region doped with chlorine at 800 atomic ppm or higher.

The invention relates to the technical field of sewage treatment, and discloses a microbial electricity generation and energy storage integrated buried sewage treatment device which comprises an oil separation tank, a septic tank, an anaerobic and aerobic zone and a settling zone which are arranged in sequence, the anaerobic and aerobic zone comprises a plurality of reactors which are sequentially communicated, sewage sequentially passes through an anode chamber and a cathode chamber of each reactor, the cathode chamber of the reactor located at the upstream is communicated with the anode chamber of the reactor located at the downstream, an anode plate attached with microorganisms is arranged in the anode chamber, and a cathode plate attached with microorganisms is arranged in the cathode chamber; and the anode plate and the cathode plate are electrically connected with the current collection and energy storage module. Through the current formed by the potential difference between the anode plate and the cathode plate, a part of electrons can be directly led out to the current collection and energy storage module for generating electricity, so that more substrates are used for generating energy, the residual sludge amount and the yield are reduced, the environmental protection principle of reduction is met, the environmental friendliness of the sewage treatment device is improved, and the sewage treatment efficiency is improved. The device is suitable for being used close to residential areas.

The invention relates to a method for increasing the yield of ethylene and propylene. The method comprises the following steps: contacting an olefin-containing raw material with a hot regenerated first catalyst in a dense-phase bed layer of a first reactor to carry out a first catalytic conversion reaction; enabling the reacted material flow to be in contact with a heat collector arranged at the downstream of the dense-phase bed layer so as to carry out instantaneous cooling, cooling the reacted material flow to a target temperature of 450-530 DEG C, and then carrying out separation treatment on the cooled material flow so as to obtain first reaction oil gas rich in ethylene and propylene; part of the first catalyst in the dense-phase bed layer is taken out from a slide valve at the bottom of the first reactor, so that the density of the first catalyst in the dense-phase bed layer is 100-700 kg / m < 3 >. By increasing the density of the catalyst and reducing the bed height of the first catalyst, the contact reaction time of the hydrocarbon oil raw material and the first catalyst is shortened, the catalytic cracking reaction is enhanced, the yield of low-carbon olefin is increased, and the yield of dry gas in the product is reduced.

The invention discloses a polyelectrolyte material. The polyelectrolyte material comprises a poly (aryl-alkylene) main chain; the main chain does not contain heteroatoms such as sulfur, ether and oxygen, so that the phenomenon that unstable electron-rich sites are generated on aryl due to the electron donating effect of the heteroatoms is avoided, and hydroxyl radicals are not prone to attacking the poly (aryl-alkylene) polymer; by using a high-stability cation exchange group, the alkali resistance is improved. The dissolvability of the polymer is controlled through the dissolvability of biphenyl, the mechanical strength of the polymer is increased by the biphenyl block structure unit, the dissolvability of the polymer is increased while the strength of the polymer is ensured, and the polymer can be dissolved in methanol or methanol / water after being soaked in sodium chloride; the method is suitable for blade coating method membrane preparation and membrane electrode manufacturing.

The invention provides a cutting control method, a slicing machine, a storage medium and a control device.The cutting control method comprises the steps that when a target crystal bar is cut, actual cutting data of the torque of a main shaft of the slicing machine are obtained; inputting the actual cutting data into the torque decision model to obtain an expected cutting torque of the spindle for cutting the target crystal bar; wherein the torque decision model is obtained by training according to historical effective cutting data of the main shaft torque; and according to the expected cutting torque, the actual cutting torque of the main shaft for cutting the target crystal bar is adjusted, so that the difference value between the actual cutting torque and the expected cutting torque is adjusted to be within the preset range. Through the technical scheme provided by the invention, the problem that the quality of the obtained wafer is difficult to control when the target crystal bar is cut by using a slicing machine in the prior art can be solved.

The invention belongs to the technical field of drug development, and particularly relates to a synthetic method of piperazinone and ring-expanded analogues thereof, for example, a synthetic method of (R)-3-methyl-4-(2, 4-dimethoxybenzyl) piperazin-2-ketone, the reaction general formula is as follows: # imgabs0 #. The synthetic method comprises the following steps: step (1), a compound shown in a formula III or a salt thereof and a compound shown in a formula IV are subjected to a reaction under the action of an acid-binding agent to obtain a compound shown in a formula III; reacting in a solvent to obtain a compound shown as a formula V; the method is simple to operate, impurities in the product are obviously reduced, the purity is up to 99% or above, post-treatment is greatly simplified, the cost is reduced, the method is more suitable for amplified industrial production, more possibilities are provided for synthesis of piperazinone and ring-expanded analogues thereof, and the method has better market value and profound practical significance.

The invention provides a method for controlling the nitrogen content in the oriented silicon steel smelting process, and relates to the technical field of ferrous metallurgy. Ferro-silicon nitride is added twice in the vacuum treatment stage of RH refining to adjust the nitrogen content of molten steel; the addition amount of the silicon iron nitride for the second time is calculated based on the addition amount of the silicon nitride added for the first time, the increase amount of the nitrogen content in the molten steel after the silicon nitride is added for the first time and the target increase amount of the nitrogen content in the molten steel after the silicon nitride is added for the second time through a preset calculation model; the addition amount of the silicon iron nitride for the second time is obtained on the basis of the yield of the nitrogen element after the silicon nitride is added for the first time in the same furnace, so that the influence of the difference of various process parameters of different furnaces on the yield of the nitrogen element is avoided; the difference between the content of the nitrogen element in the RH refining outbound molten steel and the target nitrogen content of the RH refining outbound molten steel is small, and accurate control over the content of the nitrogen element in the RH refining outbound molten steel is achieved.