2546 results about "Nitric acid" patented technology

The invention relates to a carbon quantum dot for strengthening and promoting growth of microalgae and application thereof. In the process of preparing the carbon quantum dots by a conventional hydrothermal method, a precursor mixture is subjected to acidification modification in advance, the pH value is adjusted to 2 by using nitric acid, and then a hydrothermal reaction is performed, so that the prepared carbon quantum dots have the capability of promoting the growth of microalgae. However, if other acids are adopted or pH adjustment is not in place, the effect cannot be achieved, and even the inhibition effect can be achieved. The obtained product is good in effect and stable in performance, no special reaction device needs to be additionally arranged in the acidification modification process, and the method has the advantages that operation is easy and convenient, raw materials are easy to obtain, and the process can be quantified; the method is simple and convenient in process operation, has universality and is easy for industrial production.

The invention belongs to the technical field of denitration catalyst preparation, and discloses a meerscham-TiO2 composite carrier loaded manganese cerium medium and low temperature denitration catalyst and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing meerschaum and nitric acid, then heating and stirring for reaction, then carrying out suction filtration and washing, and drying to obtain a meerschaum-TiO2 composite carrier loaded manganese cerium medium and low temperature denitration catalyst; after the treated sepiolite is drained, drying and screening are conducted, and nitric acid acidified sepiolite is obtained; and (2) mixing the meerschaum acidified by nitric acid and TiO2, then adding the manganese source precursor solution into the acidified meerscham-TiO2, then dipping and stirring, dropwise adding a potassium permanganate solution into the solution, then adding a cerium nitrate solution, stirring and then carrying out suction filtration, drying, grinding and screening the obtained filter cake, and then calcining to obtain the catalyst. According to the invention, the acidified sepiolite and TiO2 are compounded, so that complementary advantages of the two carrier materials are realized, and the obtained catalyst not only has good denitration efficiency, but also can significantly reduce the production cost.

The invention discloses a synthesis method of a hydrazine dicarboxylate modified cerium dioxide abrasive, and belongs to the technical field of precise polishing materials. The method comprises the following steps: taking cerous nitrate as a raw material, and preparing a cerous carbonate precursor through an ammonium carbonate precipitation reaction; and grinding and calcining the obtained precursor and hydrazine dicarboxylate to obtain the CeO2 grinding material with the surface rich in oxygen vacancies. And Ce < 4 + > can be partially reduced into Ce < 3 + > by reducing fragments generated by decomposition of the hydrazine dicarboxylate in the calcining process, so that an oxygen vacancy structure is formed through induction, and the chemical activity and the reaction rate of the abrasive are improved. The obtained grinding material shows excellent performance in chemical mechanical polishing (CMP) of K9 glass, the material removal rate (MRR) is increased by about 3.6 times compared with that of unmodified CeO2, the surface roughness (Ra) is reduced to about 0.16 nm or below, and grinding material particles are good in dispersity and less in agglomeration. The used hydrazine dicarboxylate is stable, low in toxicity and mild in reaction, and the particle size can be prevented from excessively growing while the high oxygen vacancy concentration is kept.

The invention relates to the technical field of new material detection, in particular to a copper foil coating content detection method. The method comprises the following steps: preparing a plurality of mixed standard solutions; the mixed standard solution comprises copper ions and at least one to-be-detected element ion; in the plurality of mixed standard solutions, the copper ion concentrations are the same and are first preset concentration values; measuring a plurality of mixed standard solutions, and establishing a standard curve between a theoretical value and a measured value of the ion concentration of each to-be-measured element; dissolving a plating layer on the surface of the to-be-detected copper foil by using nitric acid, and filtering to obtain a to-be-detected sample solution; adding copper salt into the to-be-detected sample solution to obtain a to-be-detected analysis solution; measuring the to-be-measured analysis solution to obtain the measurement concentration of each to-be-measured element ion; according to the measured concentration of each to-be-measured element ion and the corresponding standard curve, the corrected content of each to-be-measured element ion is obtained. The problem that an existing copper foil coating content detection method is low in detection accuracy is solved.

The invention relates to the technical field of metal material hot working, and discloses a hot-rolled coiled plate production process which comprises the following steps: preparing a reaction type protective agent, the high-temperature-resistant coating is prepared from the following raw materials in parts by weight: 20 to 40 parts of tetraethoxysilane, 5 to 15 parts of triethyl phosphate, 1 to 5 parts of triethyl borate, 0.5 to 2.0 parts of cerous nitrate (III) hexahydrate, 0.1 to 1.0 part of lithium acetate and 0.01 to 0.05 part of vanadyl acetylacetonate (IV). Coating the surface of a hot-rolled plate blank with the protective agent; the coated plate blank is heated in a heating furnace, so that the protective agent forms a molten-state protective layer in situ; carrying out hot rolling on the plate blank with the molten protective layer; and cooling and coiling the hot-rolled steel strip. In the whole heating and hot rolling process, the molten protective layer isolates the contact between the steel and the oxidizing atmosphere, so that the generation of oxide scales is fundamentally inhibited, the production process is simplified, and the metal yield is increased.

The invention discloses a preparation method and application of a high-nitrogen-doped ordered mesoporous carbon supported copper catalyst, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: by taking cane sugar and a copper-nitrogen complex as raw materials, SBA-15 as a template agent and sulfuric acid as a catalyst, carrying out equivalent-volume impregnation, low-temperature heat treatment, 800-900 DEG C high-temperature carbonization and nitric acid / hydrofluoric acid demolding to prepare pyrrole nitrogen enriched or pyridine nitrogen enriched high-nitrogen doped ordered mesoporous carbon with a large specific surface area; the preparation method comprises the following steps: loading a copper species on high-nitrogen-doped ordered mesoporous carbon by adopting an equivalent-volume impregnation method, and reducing at 350-400 DEG C to prepare the high-nitrogen-doped ordered mesoporous carbon loaded copper catalyst. The prepared catalyst is high in nitrogen content, large in specific surface area, high in pyridine nitrogen or pyrrole nitrogen enrichment degree and uniform in copper particle dispersion and shows efficient catalytic performance in methanol oxidative carbonylation reaction, and the highest methanol conversion rate is 9.3%.

The invention relates to the technical field of molten salt, in particular to nitro binary molten salt and a preparation method thereof. The preparation method comprises the following steps: mixing sodium carbonate and a potassium hydroxide solution, and then adding a starch-based grafted crystal inhibitor to inhibit crystallization; adding a nitric acid aqueous solution in two stages, and introducing eutectic seed crystals to guide nucleation at the end of the first stage; crystal distribution is optimized through falling film evaporation and concentration and setting of partial reflux; and after spraying granulation, carrying out short-time melting reforming and controlled cooling in an inert atmosphere. According to the method, the composition uniformity and the structural stability of the molten salt are remarkably improved, so that the product has a melting point close to a theoretical eutectic point, low supercooling degree, high melting latent heat and excellent thermal cycling stability and corrosion resistance, and is suitable for an industrial heat storage system running for a long time.

The invention discloses a high-sulfur-tolerance SCR honeycomb denitration catalyst and a preparation method thereof, and belongs to the technical field of industrial catalysts.The preparation method comprises the steps that S1, anatase type TiO2 and NH4HCO3 are mixed for pulping, pre-drying and calcination are conducted after extrusion forming, and a green body is formed; s2, carrying out nitric acid treatment on the green body, dipping the green body in a mixed solution of copper nitrate hydrate and cerium nitrate hydrate, and carrying out vacuum dipping, microwave drying and two-stage calcination to obtain a desulfurization carrier; s3, depositing an ammonium metatungstate precursor on the surface of the desulfurization carrier through CVD, and calcining to form a WO3 transition layer; and S4, dipping the transition layer in an acid solution containing NH4VO3 and ammonium metatungstate, and calcining after ultrasonic treatment to obtain a finished product. According to the method, the pore structure of the carrier is optimized through chambering treatment, and the stability and denitration efficiency of the catalyst in high-sulfur flue gas are remarkably improved by combining a multistage sulfur-resistant mechanism that the desulfurization layer preferentially captures SO2, the WO3 transition layer obstructs sulfur penetration and the denitration layer is protected by active sites.

The invention discloses a perovskite type composite metal oxide oxygen carrier catalyst as well as a preparation method and application thereof, and belongs to the field of biomass chemical chain gasification / reforming. The oxygen carrier catalyst is of a La, Fe and Ni co-doped SrTiO3 perovskite structure, and active components Fe and Ni are embedded into a main body SrTiO3 perovskite crystal phase structure in an oxide or simple substance form; the method comprises the following steps: preparing an aqueous solution of lanthanum nitrate, strontium nitrate, nickel nitrate, ferric nitrate and citric acid, adding a mixed solution of tetrabutyl titanate and ethylene glycol into the aqueous solution, heating in a water bath, and stirring to form gel; drying and calcining the gel to obtain intermediate powder; and the intermediate powder is oxidized and reduced to form a high-temperature crystal structure under different atmospheres, and the perovskite type composite metal oxide oxygen carrier catalyst is obtained. The oxygen carrier catalyst provided by the invention has high tar conversion rate and stable cycle activity in the biomass chemical chain gasification / reforming process.

The invention relates to the technical field of etching liquid, in particular to a copper metal etching liquid composition. Comprising the following components in percentage by weight: 5-10% of hydrogen peroxide, 0.1-0.3% of a first fluorine source, 1-5% of first inorganic acid, 1-5% of alkali, 0.01-0.8% of a first metal corrosion inhibitor and the balance of deionized water; and the auxiliary agent comprises 2-8% of a second fluorine source, 10-55% of second inorganic acid, 0.1-2% of a second metal corrosion inhibitor and the balance of deionized water. The etching liquid is excellent in etching effect, CD-loss reaches 0.6-0.8 [mu] m, the slope angle reaches 40-50 degrees, the highest copper load reaches 20000 ppm, and meanwhile the problem that when copper is high, due to the fact that the nitric acid concentration is too high, metal etching is abnormal is solved.

The invention relates to the technical field of alloy processing, and discloses a high-performance corrosion-resistant nickel-based alloy plate and a preparation method thereof, and the method comprises the following steps: raw material preparation, smelting treatment, casting treatment, hot rolling treatment, solution treatment, aging treatment and surface passivation treatment. According to the invention, when a composite acid system is adopted for passivation treatment, the concentration of chromium / molybdenum atoms in a passivation film is optimized and balanced due to the specific ratio of nitric acid to chromic acid, a chromium oxide provides a compact passivation barrier, and a molybdenum oxide endows the film layer with a self-repairing characteristic to synergistically inhibit pitting nucleation; meanwhile, nano titanium dioxide particles pretreated by silane are embedded into the passivation film in situ under the action of ultrasonic oscillation, organic pollutants adsorbed on a film layer can be decomposed by the photocatalytic characteristic of the nano titanium dioxide particles, the local corrosion effect of a battery caused by dirt coverage is avoided, and the performance of the battery is improved through double upgrading of components and the structure of the passivation film. And the alloy plate has excellent pitting corrosion resistance and fouling resistance in a chloride ion-containing medium.

The application discloses a preparation method of a catalyst for liquid-phase refining of crude octanol, and the preparation method comprises the following steps: (1) mixing pretreated fly ash and pseudo-boehmite, adding deionized water and nitric acid, stirring until a colloid is formed, drying the colloid, mixing the dried colloid with kaolin, and obtaining a carrier through kneading, extrusion molding, drying and calcination; (2) taking a nickel salt, a manganese salt and a zinc salt as active components, taking a calcium salt as an auxiliary component, dissolving the active components and the auxiliary component in deionized water to obtain a salt solution, adding n-hexane into the salt solution and stirring uniformly to prepare an impregnation solution, immersing the carrier in the impregnation solution, and obtaining the catalyst through washing, drying and calcination. The catalyst prepared by the method is mainly used in a liquid-phase refining reaction process of crude octanol, and has high activity stability and selectivity.

The invention discloses a preparation method of a hydrofining catalyst for petrochemical engineering. The preparation method comprises the following steps: step a, carrier pretreatment: putting an aluminum oxide precursor into a dilute nitric acid solution with the mass fraction of 1-5%, dipping for 2-4 hours, and drying at 120-150 DEG C for 3-6 hours; the comprehensive performance of the catalyst is remarkably improved by modifying the alumina carrier with phosphoric acid and optimizing an active component loading process; a gradient acid center is constructed on the surface of the carrier through phosphoric acid treatment to promote adsorption and dissociation of the sulfur / nitrogen-containing compound; the dispersion degree of the active phase is enhanced and high-temperature sintering is inhibited by a bimetal synergistic loading strategy; the pore structure evolution is effectively controlled by a segmented drying and stepped heating roasting process, a through type mesoporous network is formed, and the macromolecular diffusion efficiency is improved; the obtained catalyst is improved in activity in diesel oil hydrodesulfurization, improved in mechanical strength and prolonged in service life.

The invention discloses a compatible molybdenum-aluminum mixed acid etching solution which comprises the following components in percentage by mass: 4%-7% of nitric acid, 55%-65% of phosphoric acid, 17%-28% of acetic acid, 0.5%-3% of an oxidizing additive, 0.05%-5% of a metal corrosion inhibitor and 10%-20% of deionized water, and the oxidizing additive is ceric nitrate and at least one selected from sodium nitrate, potassium nitrate and ammonium nitrate; the etching liquid does not contain other organic components except for organic carboxylic acid and organic carboxylate. According to the compatible molybdenum-aluminum mixed acid etching solution, on the basis that ceric nitrate is introduced, the content of nitric acid is reduced, the nitrate ion concentration is increased by adding nitrate, the overall oxidation performance of an etching solution system is improved, the etching rate ratio of different metals is adjusted, CD-Bias is reduced, the etching dip angles of a molybdenum single layer and a molybdenum-aluminum laminated layer are controlled to be kept at 20-50 degrees, and the problem of aluminum thorns is solved. The invention further discloses a molybdenum-aluminum etching method based on the compatible molybdenum-aluminum mixed acid etching solution.

The invention provides a method for preparing a zirconium boride ceramic material through pressureless sintering, and belongs to the technical field of zirconium boride ceramics. The method comprises the steps of preparing zirconium boride composite powder, modifying silicon carbide nanowires and mixing and sintering. The method for modifying the silicon carbide nanowire comprises the steps of acid treatment and modification, the modification step comprises the following steps: adding aluminum isopropoxide into absolute ethyl alcohol, adding a nitric acid solution, stirring for 1.5-2.0 hours at the temperature of 60-63 DEG C, adding the acid-treated silicon carbide nanowire, carrying out ultrasonic dispersion and water bath evaporation, then drying, putting into a muffle furnace, and carrying out heat preservation for 2.0-2.2 hours at the temperature of 490-500 DEG C to obtain a modified silicon carbide nanowire; the ceramic material prepared by adopting the method disclosed by the invention is high in density, good in mechanical property and excellent in high-temperature oxidation resistance and stability in a complex environment.

The invention provides a biochar repairing agent for marine sediments and a preparation method of the biochar repairing agent, and belongs to the technical field of repairing agents. The preparation method comprises the following steps: carbonizing straws, modifying by phosphoric acid and concentrated nitric acid, depositing ferroferric oxide-titanium dioxide, loading UiO-66-(COOH) 2 on the surface, coupling cyclodextrin-MOF and chitosan, crosslinking, performing magnet separation, washing and drying to obtain the biochar repairing agent for the marine sediments. The biochar repairing agent for the marine sediments prepared by the invention has a relatively large specific surface area and a plurality of coordination groups, can better fix heavy metal ions in the marine sediments, also has a photocatalytic degradation effect on organic pollutants, and is good in mechanical strength, easy to store and transport, safe, environment-friendly and easy to separate; wide application prospects are realized.

The invention relates to the technical field of metal injection molding, and discloses a process for preparing an ultrahigh-toughness MIM part through integration of multistage degreasing and gradient sintering, and the process comprises the following steps: metal powder and a binder are mixed in proportion, and uniform feed is obtained after banburying and granulation; injection-molding the feedstock into a green body; the green body is sequentially subjected to catalytic degreasing and stepped thermal degreasing, the catalytic degreasing is carried out in a nitric acid-containing atmosphere, and the thermal degreasing is carried out in a multi-stage heating procedure under the protection of inert gas; and carrying out multi-stage gradient sintering on the degreased green body in a vacuum or inert atmosphere, wherein the multi-stage gradient sintering comprises low-temperature pre-sintering, medium-temperature deoxidization and decarbonization and high-temperature densification sintering. According to the invention, through organic combination of multi-stage catalytic degreasing and stepped thermal degreasing, efficient and thorough removal of the binder is realized, carbon residues, bubbles and internal defects caused by incomplete degreasing are effectively avoided, and the quality of the green body and the structural integrity before sintering are improved.

The invention relates to the technical field of OLED (Organic Light Emitting Diode) manufacturing process etching processes, in particular to a silver etching solution for an OLED manufacturing process as well as a preparation method and application of the silver etching solution. The silver etching liquid comprises nitric acid, phosphoric acid, a buffer agent, a metal ion chelating agent and an ionic liquid inhibitor, the ionic liquid inhibitor comprises 1-butyl-3-methylimidazole phosphate, the metal ion chelating agent is selected from at least one of pyromellitic acid, diethylenetriamine pentaacetic acid and ethylenediamine tetramethylene phosphoric acid, and the buffer agent is selected from at least one of sodium chloride, sodium chloride and sodium chloride. The buffering agent comprises acetic acid, and all the components are prepared according to a specific mass ratio. The etching solution can balance the etching rate of silver and indium tin oxide, avoid silver residues and black spot defects, prolong the service life of the solution, reduce the use of a volatile buffer agent, adapt to the OLED fine manufacturing process, improve the product yield and reduce the production cost, and is suitable for etching of a metal substrate in the OLED manufacturing process.

The invention relates to the technical field of high-temperature alloy materials, and provides an N10276 profiled bar and a forming method thereof.The surface of a blank is coated with a three-layer composite sheath, the blank is heated in a partitioned and gradient mode, the temperature of a side wing plate area is 50-100 DEG C higher than that of a web plate area, the metal fluidity of a side wing plate is improved, cogging rolling, four-roller reciprocating finish rolling, partitioned and gradient cooling and secondary solution treatment are conducted, and the N10276 profiled bar is obtained. A nitric acid and hydrofluoric acid mixed solution is used for pickling and stripping the composite sheath, an oxide layer is removed, intergranular corrosion is avoided, a triple sheath synergistic protection mechanism is adopted, oxygen is physically isolated by outer stainless steel, and heat loss is inhibited by a middle yttria-stabilized zirconia ceramic fiber layer.

The preparation method of the Ni-Mn bimetallic oxide modified magnesium-based hydrogen storage composite material comprises the steps that 1, under the protection of an argon atmosphere, pure magnesium powder is placed in a reaction kettle, and a product MgH2 is obtained; step 2, dissolving nickel nitrate hydrate and manganous nitrate hydrate in absolute ethyl alcohol, adding urea into the mixed solution, continuously stirring at room temperature, and then carrying out constant-temperature reaction in a tetrafluoropolyvinyl chloride high-pressure reaction kettle in a drying oven; after the reaction is finished, cooling to room temperature, and carrying out centrifugal washing; supernate obtained after centrifugal washing is poured out, precipitates are reserved and transferred into a vacuum drying box, and vacuum drying is conducted; grinding a block obtained after drying, and transferring the block into a tubular furnace for heat treatment to obtain a bimetallic oxide NiMn2O4; 3, MgH2, NiMn2O4 and stainless steel ball milling beads are weighed and put into a mechanochemical reaction ball milling kettle, intermittent ball milling is conducted for a certain time under the protection of a specific atmosphere, and then a composite sample MgH2-NiMn2O4 is collected. The practical application benefit of the magnesium-based hydrogen storage technology can be greatly improved.

The invention relates to a method for recovering platinum in nickel-platinum waste. The method comprises the steps of hot nitric acid dissolution, filtration, pH adjustment, selective precipitation and drying. The characteristic that hot nitric acid can completely dissolve Ni and partially dissolve Pt is utilized to achieve preliminary separation of NiPt, sodium sulfide is used as a precipitator, selective precipitation of platinum is achieved through the Ksp difference of platinum sulfide and base metal sulfide within the pH range of 1-2, the recovery rate of platinum is greatly increased, and energy consumption of the platinum recovery process is reduced. Emission of a large amount of volatile acid is avoided while economic benefits are improved, and the method is more suitable for actual production.

The invention relates to the technical field of preparation methods of nano precursor powder, in particular to a synthesis method of Cr < 3 + > doped magnesium aluminum oxide nano powder, which comprises the following steps: weighing magnesium nitrate, aluminum nitrate and chromic nitrate according to the stoichiometric ratio of MgAl2-xO4: xCr < 3 + >; stirring and mixing the prepared magnesium nitrate solution, aluminum nitrate solution and chromic nitrate solution together to prepare a mixed solution I; ammonia water is dripped into the first mixed solution, then the first mixed solution dripped with the ammonia water is stirred and mixed, and a second mixed solution is prepared; pouring the mixed solution II into a high-pressure reaction kettle, and putting the high-pressure reaction kettle into a constant-temperature box for reaction to prepare a white precipitate; adding deionized water into the white precipitate for washing and precipitating, and centrifuging to obtain white precipitate powder; drying the white precipitate powder at a constant temperature; calcining the dried white precipitate powder to prepare nano precursor powder; the prepared nanometer precursor powder has the advantages of being high in purity and small in particle size.

The application discloses an indium-based oxide catalyst, which is prepared by the following method: step one, adding indium nitrate, isophthalic acid, DMF, acetonitrile, imidazole and nitric acid into a reaction kettle, reacting at 80 DEG C for 12 hours, then heating to 100 DEG C and reacting for 24 hours, washing with DMF and anhydrous ethanol respectively, and vacuum drying for 12 hours to obtain an In-MOF precursor; step two, keeping the In-MOF precursor under the condition of nitrogen atmosphere and 200-600 DEG C for 4 hours, and naturally cooling to room temperature to obtain the indium-based oxide catalyst. Most of the prepared indium-based oxide catalysts still retain the corresponding three-dimensional hierarchical porous framework structure of the original MOF; the indium-based oxide catalyst contains highly dispersed metal active sites inside, effectively reduces the aggregation of metal oxides or metal elements, and thus exhibits more excellent catalytic activity; the organic ligand isophthalic acid generates a large amount of carbon material through pyrolysis under an inert atmosphere, greatly improving the conductivity of the indium-based oxide catalyst.

The invention relates to the technical field of rare earth element separation methods, in particular to a method for separating ytterbium and lutetium by using a phosphate adsorbent, which comprises the following steps: loading a phosphate solution on a porous solid-phase carrier by using a vacuum impregnation method, and carrying out reduced pressure evaporation and drying to obtain a phosphate solid adsorbent; filling an exchange column with the solid adsorbent to obtain the exchange column filled with the solid adsorbent; enabling a nitric acid solution containing ytterbium and lutetium to flow through an exchange column filled with a solid adsorbent to complete a column adsorption process; and performing elution, performing desorption by using a desorption solution to obtain the regenerated exchange column filled with the solid adsorbent, respectively collecting the ytterbium solution and the lutetium solution, completing the separation process, and repeating the steps. By adopting the steps, the separation of ytterbium and lutetium is directly realized from the nitric acid solution containing ytterbium Yb and lutetium Lu through column adsorption separation, leaching and desorption processes, and high-purity ytterbium and lutetium products are prepared.

The invention discloses a nitrogen-doped carbon nanotube modified magnetic pyrite composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of water treatment. The nitrogen-doped carbon nanotube modified magnetic pyrite composite catalyst is prepared from the following raw materials: multi-walled carbon nanotubes, a concentrated nitric acid solution, melamine, magnetic pyrite powder and sodium percarbonate. According to the preparation method, magnetic pyrite and nitrogen-doped carbon nanotubes are mixed according to the ratio of 15: 1, nitrogen heat treatment is performed for 3 h at the temperature of 600 DEG C to form a composite carrier, and then activation treatment is performed through sodium percarbonate to obtain the catalyst. According to the catalyst, the electron transfer capacity and adsorption performance are enhanced through the nitrogen-doped carbon nanotubes, Fe < 2 + > / Fe < 3 + > circulation of the magnetic pyrite is cooperated, and the dual effects that sodium percarbonate is efficiently activated to generate free radicals to degrade pollutants and rapid recovery is achieved through magnetism can be achieved. The catalyst prepared by the invention is suitable for deep treatment of organic matters and heavy metals in industrial wastewater, and has the advantages of wide pH adaptation range, no secondary pollution and recyclability.

The invention relates to the technical field of early warning and monitoring, in particular to a deep groundwater supplementation data analysis and early warning system which comprises a signal processing module, an oxygen consumption analysis module, a nitrogen transmetabolism module, a risk identification module and a coupling optimization module. According to the method, the metabolism trend is analyzed by synchronously collecting underground multi-depth chemical indexes and removing noise, establishing a unified time sequence data set, extracting dissolved oxygen, nitrate and ammonia nitrogen concentration change characteristics, calculating the oxygen dissipation rate and constructing the time-depth distribution relation, and combining nitrogen conversion rate regression. A risk section is identified according to the directions of oxygen dissipation increase and metabolism decrease, the micro-potential gradient and coupling index change are further analyzed in combination with an electrochemical change rule, dynamic identification and risk early warning of the deep groundwater refilling process are achieved, and monitoring is changed from static data comparison to multi-dimensional dynamic analysis. The accuracy and the timeliness of abnormal recognition are improved, and the complement safety and the continuity and the reliability of data results are guaranteed.

The invention belongs to the technical field of iron-based alloys, and particularly relates to a duplex stainless steel material and a preparation method and application thereof. According to the method, the chemical component content of the duplex stainless steel is precisely regulated and controlled, the cold-rolled steel is rapidly placed in water after being subjected to heat treatment at the temperature of 1050-1140 DEG C, so that the surface temperature is reduced to 120 DEG C or below, and the steel can be effectively promoted to form a stable and uniform duplex structure in the process. Performance tests show that the percentage elongation after fracture of the steel at room temperature reaches 35.3-39.2%, excellent plasticity and toughness are shown, it is ensured that the material is not prone to brittle fracture when stressed, and the deformation requirement under the complex working condition can be better met; the hardness value is 28.3-29.1 HRC, which indicates that the material has higher strength, can bear higher load and pressure, and meets the use requirements in a high-pressure environment; and the corrosion rate is only 0.343-0.771 [mu] m / 48 h in a 65% + / -0.2% nitric acid environment, the extremely high corrosion resistance is highlighted, and long-term stable service can be achieved in a highly corrosive medium.

The invention discloses a steel cylinder cleaning method. The method comprises the steps that ethyl alcohol is injected into a steel cylinder; rolling the steel cylinder filled with the ethanol for multiple times to rinse the inner wall of the steel cylinder, and then emptying the ethanol in the steel cylinder; injecting ultrapure water into the steel cylinder cleaned by the ethanol; rolling the steel cylinder filled with the ultrapure water for multiple times, rinsing the inner wall of the steel cylinder, and then emptying the ultrapure water in the steel cylinder; nitric acid is injected into the steel cylinder cleaned by the ultrapure water, metal ions in the steel cylinder are dissolved, and then the nitric acid in the steel cylinder is emptied; injecting ultrapure water into the steel cylinder to rinse the steel cylinder, and emptying the ultrapure water in the steel cylinder; taking the discharged ultrapure water as a sample, and detecting the content of residual metal ions in the steel cylinder; according to the obtained metal ion content, whether the steel cylinder meets the cleanliness requirement or not is judged, if the cleanliness requirement is met, a small amount of nitric acid is added into the steel cylinder, sampling detection is conducted after the steel cylinder is moistened and washed, and if the test result is consistent with the previous metal ion content, the steel cylinder is clean. According to the steel cylinder cleaning method, external source introduction is avoided while metal ion impurities in the steel cylinder are treated.