35results about How to "Control nitrogen content" patented technology

The invention discloses a method for preparing a nitrogen-doped graphene material with a hydrothermal process, relating to a method for preparing the nitrogen-doped graphene material. The technical problems of lower nitrogen content, difficulty in control of nitrogen content, high production cost, complex structure of equipment required by reaction, rigorous reaction conditions, low yield, difficulty in industrialized production and the like in the traditional method for preparing the nitrogen-doped graphene material are solved in the invention. The method comprises the steps of: 1, dissolving graphite oxide in a solvent, adding a surfactant and uniformly mixing; 2, adding a nitrogen-containing compound, and uniformly mixing; and 3, after a hydro-thermal reaction, washing and drying to obtain the nitrogen-doped graphene material. The nitrogen-doped graphene material prepared in the invention has the advantages of higher nitrogen content, controllable nitrogen content, low production cost, simple structure of required equipment, high yield and easiness in realizing industrialized production.

The invention provides a method for growing three-dimensional nitrogen-doped graphene by taking nanoporous graphene as a substrate. According to the method, oxidized graphene is taken as a precursor, a pore forming agent is added, nanometer micropores are formed in the surface of the oxidized graphene precursor through treatment, and the diameters of the pores are uniform and controllable; the precursor is combined with a silicon source and a nitrogen source through a plasma activation technology to realize the growth of porous nitrogen-doped graphene with different nitrogen contents, and a three-dimensional structure is obtained at a high temperature. According to the method, carbonized nanoporous oxidized graphene is taken as the substrate for the first time, the pore diameters of the nanometer pores of the prepared three-dimensional porous nitrogen-doped graphene are effectively controlled within 5-50 nm and are uniform, and the nanometer pores are distributed uniformly; the three-dimensional nitrogen-doped graphene with such pore diameters has more excellent electrochemical properties; since oxidized graphene is taken as the substrate, the use of a strong oxidant, which is used during an etching process when a metal substrate is used, is avoided, and the introduction of non-carbon impurity elements is also avoided, so that the nitrogen-doped graphene has higher purity.

The invention relates to a gas producing device, in particular to a device and method for producing synthesis gas through superheated steam, pure oxygen, high-temperature reheated pyrolyzed garbage and biomass. The device for producing the synthesis gas through the superheated steam, the pure oxygen, the high-temperature reheated pyrolyzed garbage and the biomass comprises a fluidized bed pyrolyzing furnace and a cyclone dust collector, a steam superheater is arranged on the outlet portion of the fluidized bed pyrolyzing furnace, a synthesis-gas high-temperature reheater is arranged on the rear portion of the cyclone dust collector, electric heating is adopted, and the temperature reaches up to 1200 DEG C or above. According to the device and method for producing the synthesis gas through the superheated steam, the pure oxygen, the high-temperature reheated pyrolyzed garbage and the biomass, the superheated steam is adopted to serve as part fluidizing air, a water gas reaction is fully utilized, the external oxygen supply of a reaction in the furnace is decreased, the nitrogen content in the synthesis gas is effectively controlled through the pure oxygen, the high quality of the synthesis gas is fully guaranteed, producing of tar and dioxin is thorough eradicated, and the difficult problem of garbage harmless treatment is solved.

The invention discloses a method for controlling the nitrogen content of a steel grade in a CV-LF-RH-CC process path, and relates to the technical field of ferrous metallurgy. The method aims at achieving stable control over the nitrogen content and alloy components of the steel grade in the CV-LF-RH-CC process path. According to the method, stable control over the nitrogen content and the alloy components is achieved by strictly controlling the converter bottom blowing process, the steel tapping alloying process, the slag variety and adding amount, LF temperature rising, slagging and alloying process bottom blowing, the RH refining vacuum degree and time, the wire feeding speed, the casting process and other processes. According to the method, through strict control over the converter blowing process, the deoxidation alloying process of the primary molten steel, the LF and RH duplex refining process and the like, all alloy elements can stably reach target values, and the nitrogen content is stably controlled to be 30 ppm or below.

The invention relates to a method for controlling the nitrogen content in N80 steel. The method comprises the following steps: firstly, the LF slag smelting is stabilized and the deoxidation technology is perfected so that the weight and the components of the molten slag are controllable and the nitrogen flushing state during the process is stable; secondly, the proper nitrogen flushing flow, pressure and time are set in the VD packing process so that the nitrogen content after emptying is stable; and thirdly, the proper nitrogen flushing time, flow and pressure are set after the VD emptying so that the nitrogen content is stable and controllable. The method performs improvement to the non-quenching and tempering way, effectively controls the nitrogen content in the N80 level steel by taking measures, not only has low cost, but also effectively reduces the surface cracks of the casting billet and improves the quality of products.

The invention discloses a smelting method for improving surface quality of a steel plate, and the chemical composition comprises by mass percent: 0.02%-0.60% of C, less than or qual to 0.20% of Si, 0.30%-2.20% of Mn, less than or equal to 0.030% of P, less than or equal to 0.0050% of S, less than or equal to 0.30 % of N, less than or equal to 0.070% of Nb, less than or equal to 0.50% of Cu, less than or equal to 0.0050% of N, 0.006%-0.020% of Ti, less than or equal to 0.30% of Cr, 0.015%-0.050% of Al and balance of Fe and impurities. The smelting method provided by the invention can achieve the purpose of optimizing the surface quality of a casting blank by rationally adjusting the smelting composition, high-purity steel smelting, low-oxygen nitrogen harmful element control, reasonable superheat control, covering slag selection, dynamic soft reduction adjustment and the like.

The invention provides a large area nitrogen-doped carbon nano-tube paper preparation method, which comprises: (1) weighing ferrocene powder, dissolving in dichlorobenzene to form a ferrocene/dichlorobenzene carbon source solution, weighing pyridine, and mixing the pyridine and the ferrocene/dichlorobenzene carbon source solution to form a ferrocene/dichlorobenzene/pyridine mixing carbon source solution; 2) coiling an iron sheet or copper sheet substrate into a cylindrical material, placing into the quartz reaction chamber of a reaction furnace, sealing the reaction chamber, introducing argon gas to completely discharge air, and heating the reaction furnace; 3) when the temperature of the reaction chamber achieves 750-900 DEG C, adjusting the argon flow rate while introducing hydrogen; 4) injecting the ferrocene/dichlorobenzene/pyridine mixing carbon source solution into the reaction chamber, and carrying out a reaction; and 5) stopping the heating of the tubular reaction furnace, closing the hydrogen, adjusting argon flow rate to make the product be cooled to a room temperature along with the furnace, and collecting the large area nitrogen-doped carbon nano-tube paper on the substrate. According to the present invention, the nitrogen-doped structure carbon nano-tube film two-dimensional structure and the simple, rapid and large-scale preparation method can be used for the fields of new energy sources, sensors, flexible electronic devices, and the like.

The invention belongs to the field of ferrous metallurgy, and particularly relates to a V and Cr containing microalloy building steel wire rod and a production method thereof. The V and Cr containingmicroalloy building steel wire rod and the production method thereof are provided according to the problems that vanadium nitride alloys selected for preparing nitrogen containing alloy steel in the prior art are low in nitrogen content, few in kind and the like. The steel wire rod comprises, by weight percent, 0.15%-0.30% of C, 0.30%-1.00% of Si, 0.60%-1.30% of Mn, 0.0060%-0.0180% of N, not larger than 0.040% of P, not larger than 0.040% of S, 0.010%-0.160% of V, 0.10%-0.60% of Cr and the balance Fe and inevitable impurities. The preparation method of the steel wire rod is characterized in that an N containing cored wire is fed into a furnace rear small platform, and N is adjusted to the proper level. The method is simple in operation, the nitrogen yield is high and stable, the productioncost can be effectively reduced, and the method is worthy of use and popularization.

The invention belongs to the field of steel metallurgy and particularly relates to a microalloy building steel wire rod containing V, Ti and Cr and a production method of the microalloy building steelwire rod. The microalloy building steel wire rod containing V, Ti and Cr and the production method of the microalloy building steel wire rod are provided for solving the problems that vanadium nitride alloys are adopted for preparing nitrogen-containing alloy steel at present, the nitrogen content is low, and kinds are few. The steel wire rod includes, by weight, 0.15%-0.30% of C, 0.30%-1.00% ofSi, 0.60%-1.30% of Mn, 0.0060%-0.0180% of N, smaller than or equal to 0.040% of P, smaller than or equal to 0.040% of S, 0.010%-0.100% of V, 0.010%-0.030% of Ti, 0.10%-0.60% of Cr and the balance Fe and inevitable impurities. The preparing method of the microalloy building steel wire rod containing V, Ti and Cr is characterized in that N-containing core spun yarn is fed into a small platform behind a furnace, and N is adjusted to the proper level. The method is easy to operate, the nitrogen yield is high and stable, the production cost can also be effectively reduced, and the method is worthyof application and popularization.

The invention relates to a method for remelting high-strength stainless steel. The method is characterized by including the steps that Fe-Mn-Cr nitrogen absorption alloy melt containing manganese and chromium is first smelted, then, high-nitrogen steel waste material is added to the nitrogen absorption alloy melt step by step at low melt temperature, nitrogen-containing alloy is added in proportion according to the designed composition proportion of high-nitrogen steel, and after being completely melted and homogenized, the nitrogen-containing alloy is discharged for pouring. The method solves the problem that the nitrogen content is insufficient in the recovering and remelting processes of the high-nitrogen steel waste material and can control the nitrogen content of new high-nitrogen steel smelted by the high-nitrogen steel waste material to be close to or not lower than that of the original high-nitrogen steel waste material.

The invention relates to a water quality improver and in particular to the water quality improver for aquaculture and a preparation method of the water quality improver. The quality improver is prepared from the following raw materials in parts by weight: 20 to 30 parts of bacillus subtilis, 20 to 30 parts of rhodobacter sphaeroides, 4 to 8 parts of liquid ozone, 3 to 7 parts of titanium dioxide powder, 5 to 9 parts of phosphoric acid, 1 to 5 parts of magnesium oxide powder, 2 to 6 parts of potassium chloride powder, 1 to 4 parts of vitamin and 3 to 7 parts of oyster shell powder. By using the technical scheme provided by the invention, the defects of incompletely removing ammonia nitrogen, hydrogen sulfide and nitrite in wastewater in the improver provided by the prior art can be made up to a certain degree.

The invention discloses an LF furnace nitrogen-control refining method. The method comprises the steps that firstly, slag is melted, specifically, slag is melted rapidly through short arc and high power; and secondly, temperature is rapidly increased, specifically, after slag is melted, arc is lengthened properly, and input power is increased. Through the LF furnace nitrogen-control refining method, the nitrogen content in steel can be effectively controlled, and the deep drawing performance of the steel is ensured.

The invention discloses a smelting method for improving heavy rail steel cleanliness, and belongs to the technical field of iron and steel metallurgy. According to the smelting method for improving the heavy rail steel cleanliness, the technical problem that cleanliness of existing domestic heavy rail steel can difficultly meet the requirements of high-speed railways is solved. The smelting methodcomprises the steps of molten iron pretreatment, converter smelting, LF refining, RH refining and continuous casting, wherein calcium treatment is carried out by adopting an iron and calcium line with molten steel of 12-15 m/t in the step of LF refining. According to the smelting method for improving the heavy rail steel cleanliness, it is ensured that P is less than or equal to 0.0060%, S is less than or equal to 0.0030%, O is less than or equal to 0.0010%, N is less than or equal to 0.0050%, H is less than or equal to 0.00015%, the total amount of P and S and O and N and H is less than or equal to 160ppm, and various ratings of inclusions are less than or equal to 1.0 level in a steel rail, so that the heavy rail steel cleanliness is significantly improved, and the smelting method for improving the heavy rail steel cleanliness has certain social benefits and is worth popularizing and applying.

The invention belongs to the field of steel metallurgy and particularly relates to a V-containing microalloy building steel wire rod and an LF furnace production method of the V-containing microalloybuilding steel wire rod. The V-containing microalloy building steel wire rod and the LF furnace production method of the V-containing microalloy building steel wire rod are provided for solving the problems that vanadium nitride alloys are adopted for preparing nitrogen-containing alloy steel at present, the nitrogen content is low, and kinds are few. The steel wire rod includes, by weight, 0.15%-0.30% of C, 0.30%-1.00% of Si, 0.60%-1.30% of Mn, 0.0060%-0.0180% of N, smaller than or equal to 0.040% of P, smaller than or equal to 0.040% of S, 0.010%-0.160% of V and the balance Fe and inevitableimpurities. The preparing method of the V-containing microalloy building steel wire rod is characterized in that N-containing core spun yarn is fed into a LF furnace, and N is adjusted to the properlevel. The method is easy to operate, the nitrogen yield is high and stable, the production cost can also be effectively reduced, and the method is worthy of application and popularization.

The invention provides a lithium ion battery negative electrode material. The negative electrode material includes a silicon nitride structure taking beta phase silicon nitride as a main body, and thesilicon nitride includes more than 50 wt% of the beta phase silicon nitride; the beta phase silicon nitride is a layered hexagonal system structure; the easy embedding and embedded of lithium ions can be achieved because of layered characteristics, so that a lithium dendrites structure generated by the unfavorable embedded of the lithium ions can be reduced, and as the size of the structure is stable during charging and discharging, the recession of electric capacity caused by the breaking and disintegrating of the material can be greatly reduced, so that the cycle life of the negative electrode material can be enhanced. The chemical formula of the disclosed beta phase silicon nitride is beta-Si3Nx, wherein 1 <= x <= 4; and the beta phase silicon nitride (beta-Si3Nx) can have unstable dangling bonds, unsaturated bonds and other unpaired bonds due to low nitrogen atom weight percentage, so that the activity and electric capacity of the negative electrode material can be enhanced.

The invention relates to a high-performance duplex stainless steel wire rope alloy material and a preparation method thereof, and belongs to the technical field of steel alloy materials. The duplex stainless steel wire rope comprises the following components in percentage by mass: less than or equal to 0.03% of C, less than or equal to 0.03% of S, less than or equal to 1.0% of Si, less than or equal to 1.0% of Mn, less than or equal to 0.003% of P, 23.5-24.5% of Cr, 4.5-5.5% of Ni, 0.7-1.4% of Mo, 0.7-3.0% of Cu, 0.10-0.20% of N, 0.005-0.20% of rare earth Ce and the balance of iron and inevitable impurities. The preparation method comprises the following steps of preparing a steel billet by adopting a medium-frequency and AOD smelting process; the billets are subjected to a hot rolling process to prepare duplex stainless steel wire rods with different diameters, and the wire rods are subjected to processes such as acid pickling, repeated cold drawing and annealing to prepare semi-finished wire rods; and the semi-finished wire is subjected to stranding and rope combining, and the high-performance duplex stainless steel finished steel wire rope is obtained. The alloy material has excellent cold workability, strength, fatigue resistance and corrosion resistance, has remarkable popularization value, is particularly suitable for being used as maritime work steel, and can serve in moisture and salt corrosion environments.

The invention relates to a method for controlling sulfur and nitrate from a coke oven flue gas source, and belongs to the technical field of coking. The method for controlling sulfur and nitrate fromthe coke oven flue gas source comprises the steps of 1, desulfurization, specifically, desulfurizing recirculated coal gas by adopting PDS wet desulfurization, wherein the content of hydrogen sulfidein the desulfurized recirculated coal gas is 20mg/m<3>; and 2, denitration, specifically, adjusting the temperature of the coke oven according to the relationship between the state parameters of the coke oven and a preset value in the denitration step. According to the method for controlling sulfur and nitrate from the coke oven flue gas source, the sulfur content and the nitrate content are controlled from the coke oven flue gas source, and the control effect is good.