33results about How to "Guaranteed nitrogen content" patented technology

The invention discloses a flux-cored wire used for super duplex stainless steel gas shielded welding and a preparation method thereof. The flux-cored wire is composed of an external use steel belt andflux powder, wherein the external use steel belt is made of an austenitic stainless steel belt with 17.0%-18.0% of chromium and 11.0%-12.5% of nickel; and the flux powder comprises the following components of, in percentage by weight, 36.0%-38.0% of chromium powder, 9.0%-13.0% of high-nitrogen chromium iron, 2.5%-3.0% of electrolytic manganese metal, 4.0%-5.0% of molybdenum powder, 0.5%-1.0% of ferrosilicon, 1.0%-1.5% of ferrotitanium, 0.5%-1.0% of aluminum-magnesium alloy, 18.0%-20.0% of rutile, 1.0%-2.0% of quartz, 5.0%-6.0% of zircon sand, 1.0%-1.5% of potassium feldspar, 3.0%-3.5% of albite, 1.0%-1.5% of fluorite, 0.5%-1.0% of sodium cryolite, 1.0%-1.5% of potassium titanate, 0.1%-0.3% of bismuth oxide and the balance iron powder. According to the flux-cored wire used for super duplexstainless steel gas shielded welding and the preparation method thereof, the components and the two-phase proportion of deposited metal can be balanced, thus obtaining a duplex stainless steel welding joint which is good in forming quality and excellent in corrosion resistance.

The invention discloses a system for removing sulfur and mercury out of flue gas by adding an organic catalyst to a wet spraying absorption tower. The system comprises flue gas absorption equipment, ammonia water storage and supply equipment, dust separation and catalyst recycling equipment, evaporative crystallization equipment and process water equipment, wherein the ammonia water storage and supply equipment and the dust separation and catalyst recycling equipment are respectively communicated with the flue gas absorption equipment; the dust separation and catalyst recycling equipment is connected with the evaporative crystallization equipment; and the evaporative crystallization equipment is connected with the process water equipment. The invention simultaneously discloses a method for removing sulfur and mercury by utilizing the system. The mixture of the organic catalyst and emulsion comes into countercurrent contact with flue gas in the wet spraying absorption tower and purify and absorb the flue gas and then desulfurization saline solution is sent to a three-phase separator and the evaporative crystallization equipment to produce ammonium sulfate, thus reaching the aims of multi-effect control of the flue gas, energy conservation, consumption reduction and cost reduction.

The invention provides a preparation method of activated carbon with capability of efficiently adsorbing CO2. The preparation method comprises the following steps: adding p-aminophenol after reaction of melamine and formaldehyde, carrying out reflux reaction for 4-8h, cooling until room temperature, then adding a methanol solution of F127 or P123, respectively segmenting at temperatures of 100-120 DEG C, 130-160 DEG C, 170-190 DEG C, 210-230 DEG C and 240-260 DEG C, respectively curing to obtain nitrogen-containing prepolymer, then carbonizing, mixing a carbonized material and KOH, activating for 0.5-2.0h, repeatedly washing by deionized water until neutrality finally, and drying to obtain the product. The activated carbon has the advantages of high specific surface area, high nitrogen content and high CO2 adsorption performance.

The invention relates to a high-nitrogen austenitic stainless steel smelting method. The high-nitrogen austenitic stainless steel smelting method comprises the following steps of (1) blast-furnace molten iron pretreatment, (2) refining in a top-bottom combined blowing TSR stainless steel refining furnace, (3) refining outside a ladle refining furnace and (4) continuous casting. Compared with the prior art, the high-nitrogen austenitic stainless steel smelting method has the characteristics that the smelting cost is low, and the plate blank surface and interior quality meets the steel type requirements of the high-nitrogen austenitic stainless steel.

The invention provides a refrigerator. The refrigerator comprises a box body, a gas adjusting membrane assembly and a gas sucking pump assembly. A storing space and a compressor cabin are defined inside the box body. A storing container is arranged in the storing space, and a refreshment space is defined inside the storing container. The gas adjusting membrane assembly is arranged in the way that oxygen in airflow of a surrounding space of the gas adjusting membrane assembly can more penetrate through a gas adjusting membrane to enter an oxygen-enriched gas collecting cavity relative to nitrogen in the airflow. The inlet end of the gas sucking pump assembly communicates with the oxygen-enriched gas collecting cavity in a controlled mode through a pipeline and a pipeline switching mechanism, so that gas in the oxygen-enriched gas collecting cavity is pumped to the outside of the refreshment space, and the actual nitrogen content in the refreshment space is within the range of 81% to 98%. According to the refrigerator disclosed by the invention, the actual nitrogen content in the refreshment space is within a proper range, and aerobic respiration strength of a food material can be effectively lowered; and meanwhile, a basic respiration effect is guaranteed, anaerobic respiration of the food material is avoided, and therefore the storage effect of the food material is improved and the refreshing time of the food material is prolonged.

The invention relates to a smelting and casting process for smelting high-nitrogen non-magnetic stainless steel by using an argon oxygen furnace. The process comprises the following steps: firstly, melting 510-530kg/t of returned stub bars, 300-320kg/t of high-carbon ferrochrome, 8-40kg/t of ferromolybdenum, 14-30kg/t of electrolytic nickel and 5-10kg/t of carburant by using an intermediate frequency furnace, sampling the steel when the temperature is greater than or equal to 1560 DEG C, and then, putting the steel into the argon oxygen furnace; then, supplementing alloy into the argon oxygenfurnace according to the sampling result, performing decarburization to be less than 0.01%, adding 10-25kg/t of special ferrosilicon for reduction, adding 200-240 kg/t of electrolytic manganese, adding 5-10kg/t of aluminum, raising the temperature, and adding 20-30kg/t of ferromanganese nitride alloy in two batches; discharging the steel into a steel ladle; and transferring the steel to a pouringstation to be molded by pouring by adopting a top pouring method, and adding 0.5-1kg/t of protecting slag into the mold. The process provided by the invention is environment-friendly and low in cost and increases the utilization ratio of molten steel by 8%; and by adding the protecting slag into the mold, the surface quality of an electrode blank is ensured, and mold release is facilitated.

The invention discloses a method for preparing nitrided ferrovanadium. The method comprises the following steps that (1), a sample fabricated by uniformly mixing and pressing vanadium oxide powder, iron powder and carbon powder is subjected to prereduction through the nitrogen gas in a heating furnace, in the prereduction process, the temperature in the heating furnace is 650 +/-20 DEG C, the nitrogen gas flow is 150-180 L/h, and the heat preservation time of the heating furnace is 3-5 hours; (2), after heat preservation in step (1) is finished, the temperature of the heating furnace is then increased to 1200-1500 DEG C to perform final reduction on the sample, in the final reduction process, the nitrogen gas flow in the heating furnace is 150-180 L/h, and the heat preservation time of theheating furnace is 2-3 hours; (3), after heat preservation in step (2) is finished, the sample is cooled along with the furnace in the atmosphere of the nitrogen gas, and an obtained product is the nitrided ferrovanadium. According to the method, the vanadium oxide powder serves as the raw material, the iron powder serves as the iron source, the carbon powder serves as a reducing agent, the nitrogen gas is introduced into the heating furnace for reaction, and the method has the advantages that the procedure is simple, no vanadium slag is generated, the vanadium utilization rate is high, resources are saved, the environment is protected, and the production cost can be lowered.

The invention discloses an organic fertilizer prepared from recovered wastes of a pig farm and a preparation method thereof. The method comprises the following steps: preparing lichens, mellea armillaria sporophore, stillage, yeast powder, cake pulp, brown sugar, honey and a proper amount of water; after mixing and stirring the raw materials, putting the raw materials in a culture barrel and placing the barrel in a darkroom in a semi-hermetical manner, wherein the culture temperature is 20-30 DEG C, and after 15 days when suspended solids immerse to water, the liquid is brown and the pH value is bellow 3.8; adding pig manure, pig urine, pig bone, pig hair, pig blood, horseshit, straws, wheat straws, beanstalks, peanut stalks, copperas and magnesium sulfate into the liquid; after uniformly smashing and stirring, carrying out anaerobic fermentation at an environmental temperature of 20-30 DEG C for 10-20 days in summer and 15-30 days in winter; and smashing, prilling and drying. The organic fertilizer prepared from recovered wastes of the pig farm disclosed by the invention solves the problem of environmental pollution caused by the wastes, soil hardening caused by chemical fertilizers used on soil and unabiding fertilizer efficiency.

The invention discloses a urea sulfate coated urea slow-release granular fertilizer. The urea sulfate coated urea slow-release granular fertilizer is prepared through the following steps of: adding 100kg of urea granules of which the diameters are 2-4.5mm to a rotary drum type coating machine, preheating the urea granules to 40-45 DEG C, spraying 1-10kg of a binder namely urea sulfate, uniformly mixing the preheated urea granules and the urea sulfate so as to obtain a mixture, spraying 1-20kg of metasilicate powder, cooling the mixture and the metasilicate powder, spraying 1-10kg of mounting addition agents (a mixture of solid paraffin and liquid paraffin) of which the temperature is 50-60 DEG C, cooling the mixture, the metasilicate powder and the mounting addition agents to a room temperature, and repeating the coating operation 2-3 times. The binder namely the urea sulfate is prepared through the steps of slowly adding1-2kg of concentrated sulfuric acid of 90-98wt% to every 1-10kg of urea and performing a reaction in a reaction tank. The urea sulfate coated urea slow-release granular fertilizer disclosed by the invention adopts a urea sulfate metasilicate slow-release film, tests prove that the urea sulfate metasilicate slow release film has a favorable slow-release effect, and in the slow-release process, the slow-release film is not liable to collapse and is easy to degrade. The urea sulfate has subacidity, so that the application range of the urea sulfate is wider than that of sulfur coating urea. The urea sulfate coating film realizes double-film double-control effects, and has the advantages of high efficiency, environmental protection, low cost and the like.

The invention provides an RH refining method for removing inclusions in molten steel. According to the method, nitrogen bottom blowing is carried out during the early and medium stages of RH vacuum treatment, and nitrogen serves as RH lift gas; a denitriding path in molten steel is controlled to prevent nitrogen elements in the molten steel from being removed from bubbles, application method the nitrogen separation and nitrogen increase process during vacuum treatment are carried out simultaneously to ensure that sufficient nitrogen elements are separated out from the molten steel with the inclusions as the core; and meanwhile, the effect of stably removing the inclusions in the molten steel is achieved under the condition that molten steel is continuously replaced and renewed in the RH refining process. The removal rate of small-size inclusions reaches up to 90% or more, the cleanliness of the molten steel is remarkably improved, and meanwhile, stable and continuous production can berealized at low cost.

The invention discloses a culture medium for Coprinus comatus, made from, by weight, 55-64 parts of straws, 15-19 parts of sundry sawdust, 9-12 parts of livestock excrement, 8-12 parts of wheat bran, 1-2 parts of gypsum powder, 1-2 parts of quick lime, 1-2 parts of urea, 1-2 parts of phosphorus fertilizer, 0.5-0.8 part of a biological fermenting agent, and 80-90 parts of water. The culture medium has the advantages that the culture medium has good breathability, high water-holding capacity and sufficient nitrogen content, can provide sufficient support for the cultivation of Coprinus comatus, has rich and complete nutrition and can provide sufficient vitamins and trace elements for Coprinus comatus; crop straws are used as a main material, the environmental pollution due to straw incineration can be solved, and considerable benefits are achieved at low cost; a preparation method of the culture medium is simple and feasible, fermenting time is greatly shortened, operating efficiency is improved, and the culture medium has more promising application prospect.

The invention discloses a rural domestic wastewater treatment device based on MBBR coupling anaerobic-aerobic process integration. The device comprises an MBBR anaerobic chamber, an MBBR anoxic chamber and an MBBR aerobic chamber, a large amount of anaerobic bacteria are enriched in the MBBR anaerobic chamber for anaerobic hydrolysis, wastewater enters the device, a large amount of sulfur autotrophic denitrifying bacteria are enriched in the MBBR anoxic chamber for denitrification, and a large amount of nitrifying bacteria and phosphorus phagocytosis bacteria are enriched in the MBBR aerobic chamber. Gravity curved screens and sedimentation tanks are additionally arranged at the water outlet tail ends of the anaerobic tank and the aerobic tank, so that the flow of MBBR filler and activated sludge is ensured, the defect that the biological population ecology is influenced by drifting of suspended filler in different stages in the MBBR is overcome, and the nitrogen and phosphorus removal efficiency is improved. The system not only retains the advantages of large specific surface area and high efficiency of the MBBR, but also can greatly reduce the generation of excess sludge, and can realize regulation and control of nitrogen and phosphorus indexes of rural domestic wastewater.

The invention provides an ArHeN2CO2 protective gas for a consumable electrode gas shielded nickel-based welding wire. The consumable electrode gas shielded welding adopts the nickel-based welding wireand an ArHeN2CO2 quaternary protective gas, the mixing using amount of the nickel-based welding wire and the ArHeN2CO2 quaternary protective gas comprises the following components of, by mass, 45-50%of Ar, 45-50% of He, 2.5-3.5% of N2, and 2.5-3.5% of CO2; the use amount of the ArHeN2CO2 quaternary protective gas is mixed through different proportions, so that the content of nitrogen elements ina weld joint of a large-thickness plate is ensured, and excellent arc stiffness and strong directivity are achieved; and excellent welding of the nitrogen element without burning loss improves the compactness degree of the weld joint, and the technical problems that the nitrogen element losses and the mechanical property of weld joint is not stable in the welding process are solved. Due to the fact that the method adopting the ArHeN2CO2 quaternary gas to be mixed according to the proportions to serve as the protective gas in NiCrMo-3 nickel-based melting electrode gas shielded welding, the excellent arc stiffness is achieved, the welding efficiency is improved, the construction period is shortened, and the production cost is reduced; and the compactness degree of the weld joint is improved, and the welding difficulty is reduced, and the gas is suitable for being used as the protective gas in application for a consumable electrode gas shielded nickel-based welding wire.

The invention relates to a white butyl self-adhesive ethylene propylene diene monomer waterproof roll and a production method thereof. The white butyl self-adhesive ethylene propylene diene monomer waterproof roll is formed by compounding a base layer, a surface layer and an anti-adhesion isolation layer, the base layer is a white ethylene propylene diene monomer waterproof layer, and the surface layer is a butyl rubber self-adhesive layer; the base layer is based on 100 parts of ethylene propylene diene monomer; other components include 50-80 parts of precipitated silicon dioxide; 30-50 parts of low-melting-point glass powder; 40-70 parts of expanded perlite powder; 10-30 parts of rutile type titanium dioxide; 20-80 parts of a plasticizer; 0.8-1.5 parts of polyethylene glycol; 0.5-2 parts of a coupling agent; 0.2-0.8 part of an antioxidant 1010; 0.3-0.6 part of sulfur; 0.5-1.0 part of triallyl isocyanurate; and 3-9 parts of 1, 1-bis (tert-butylperoxy)-3, 3, 5-trimethylcyclohexane. The temperature of the roof can be greatly reduced by using the roof.

The invention provides an ArHeN2H2 protective gas for a consumable electrode gas shielded nickel-based welding wire. The melting electrode gas shielded welding adopts a nickel-based welding wire and an ArHeN2H2 protective gas, and the mass ratio of the mixed use amount of the nickel-based welding wire and the ARHN2h2 protective gas is as follows, 45-50% of Ar, 45-50% of He, 2.5-3.5% of N2, and 1.0-1.5% of H2. The use amount of the ArHeN2H2 quaternary protection gas is mixed through different proportions, the content of nitrogen elements in the weld joint of the large-thickness plate is guaranteed, excellent arc stiffness is achieved, the directivity is high, free of burning loss of nitrogen elements is achieved, the compactness degree of the welding seam is improved, and the technical problem that the mechanical property of a nitrogen element lost weld joint is not stable in the welding process is solved. In the NiCrMo-3 nickel-based melting electrode gas shielded welding, ArHeN2H2 quaternary gases are mixed according to a ratio to serve as protective gas, excellent arc stiffness is achieved, the welding efficiency is improved, the construction period is shortened, and the production cost is reduced; the compactness degree of the welding seam is improved, and the welding difficulty is reduced; and the ArHeN2H2 protective gas is suitable for being used as a protective gas for aconsumable electrode gas shielded nickel-based welding wire.

The invention provides an ArHeN2 protective gas for a consumable electrode gas shielded nickel-based welding wire. The consumable electrode gas shielded welding adopts the nickel-based welding wire and an ArHeN2 protective gas, the mixing using amount of the mass ratio of the nickel-based welding wire and the ArHeN2 protective gas comprises the following components of, 45-50% of Ar, 45-50% of He,and 2.5-3.5% of N2; the use amount of the ArHeN2 protective gas is mixed through different proportions, so that the content of nitrogen elements in a weld joint of a thin plate is ensured, and excellent arc stiffness and strong directivity are achieved; and excellent welding of the nitrogen element without burning loss improves the compactness degree of the weld joint, and the technical problems that the nitrogen element losses and the mechanical property of weld joint is not stable in the welding process are solved. Due to the fact that the method adopting the ArHeN2 ternary gas to be mixed according to the proportions to serve as the protective gas in NiCrMo-3 nickel-based melting electrode gas shielded welding, the excellent arc stiffness is achieved, the welding efficiency is improved,the construction period is shortened, and the production cost is reduced; and the compactness degree of the weld joint is improved, and the welding difficulty is reduced, and the gas is suitable forbeing used as the protective gas in application for a consumable electrode gas shielded nickel-based welding wire.

The invention relates to the technical field of steelmaking processes, in particular to a method for eliminating surface warping of hot alloy steel. The method comprises the following steps: smelting molten iron in a converter to obtain molten steel after the converter; refining and smelting the molten steel after the furnace to obtain refined molten steel; the refined molten steel is sequentially subjected to continuous casting and stack cooling, and a plate blank is obtained; the nitrogen content of the molten steel after the furnace is less than or equal to 28ppm by mass concentration; the nitrogen increasing amount of the refined molten steel is smaller than or equal to 6 ppm by mass concentration; in the continuous casting process, the nitrogen increasing amount is smaller than or equal to 3 ppm by mass concentration, and the nitrogen content of the plate blank is smaller than or equal to 40 ppm by mass concentration; in the plate blank, a metallographic structure comprises, by volume fraction, 100% of ferrite; and through a low-temperature hot delivery process of nitrogen production content and stack cooling, precipitation of second-phase particles is reduced, austenite is ensured to be completely converted into ferrite, and the defect of warping of a hot-rolled coil is eliminated.