582 results about "Perchloric acid" patented technology

The invention discloses a low-temperature zinc ion battery high-entropy eutectic electrolyte and a preparation method and application thereof, and relates to the field of batteries, the electrolyte comprises a hydrogen bond donor, a hydrogen bond acceptor and a solvent; the hydrogen bond donor is at least one of methyl sulfonamide, thioformamide, butyramide, asparagine, tert-butylamine, dimethyl propane diamine, oxalyl diamine, benzamide, sulfamide and ethyl sulfonamide; the hydrogen bond receptor is at least one of aspartic acid, glutamic acid, methionine, zinc chloride, zinc perchlorate, zinc fluoborate and zinc acetate; the preparation method comprises the following steps: mixing a hydrogen bond donor and a hydrogen bond acceptor, and heating to convert a solid into a liquid phase; and adding a solvent, and uniformly mixing to obtain the product. The invention also provides a zinc ion battery containing the electrolyte. The high-entropy eutectic electrolyte has the beneficial effects that-NH2 and halogen or carboxyl form hydrogen bonds to perform eutectic reaction, the freezing point of the eutectic solution is lower than that of a reactant, and the solvent is added to improve the confusion degree of the electrolyte, so that the high-entropy eutectic electrolyte is prepared.

The invention belongs to the technical field of electrochemical energy storage, and particularly relates to a low-temperature aqueous electrolyte for anchoring I < + > ions based on a double-coordination structure and a low-temperature four-electron aqueous zinc-iodine battery. The low-temperature aqueous electrolyte is a mixed solution of a zinc salt, an electrolyte additive and water, and the low-temperature aqueous electrolyte comprises 2-5 mol / L of the zinc salt and 0.3-0.6 mol / L of the electrolyte additive; the zinc salt is zinc perchlorate or zinc tetrafluoroborate. The low-temperature four-electron aqueous zinc-iodine battery comprises the low-temperature aqueous electrolyte. Compared with the prior art, the invention at least has the following beneficial effects: (1) the corrosion risk caused by chloride ion concentration is reduced; (2) efficient four-electron iodine positive electrode reaction is realized; and (3) obtaining the low-temperature four-electron aqueous zinc-iodine battery.

The invention discloses a two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst, which is prepared by the following steps: uniformly grinding glucose, ammonium nitrate and transition metal nitrate, calcining at high temperature to generate a two-dimensional metal oxide nanosheet, mixing the two-dimensional metal oxide nanosheet with surfactant modified reduced graphene oxide powder, and sintering at high temperature to obtain the two-dimensional metal oxide composite reduced graphene oxide burning rate catalyst. And transferring into a high-pressure hydrothermal kettle for solvothermal reaction, so that the reduced graphene oxide and the two-dimensional metal oxide nanosheet are compounded to form the composite burning rate catalyst with a 2D-2D structure. Two two-dimensional materials are compounded through a solvothermal method, the defects of accumulation of reduced graphene oxide and aggregation of the two-dimensional metal oxide due to high surface energy are effectively avoided, meanwhile, the high conductivity of the reduced graphene oxide is utilized, the synergistic catalysis effect of the metal oxide and the carbon material is enhanced, and the performance of the composite material is improved. The composite material has a good catalytic effect on the thermal decomposition process of ammonium perchlorate.

The invention discloses a preparation method and application of octahedral cuprous oxide containing defects, and belongs to the technical field of material preparation. In order to solve the problems that in existing cuprous oxide preparation, a defect structure is difficult to accurately regulate and control, and the crystal form uniformity is insufficient, the method comprises the steps that a copper source solution, a glucose solution, a sodium citrate solution and an ammonium fluoride solution with specific concentrations are mixed according to the volume ratio, the pH is adjusted to 10.5-11, then a hydrothermal reaction is conducted, and a target product is obtained through centrifugation, filtration, washing and drying. The method comprises the following specific steps: mixing solutions, reacting in a high-pressure reaction kettle at 140-165 DEG C for 4-6 hours, and realizing octahedral crystal form construction and defect regulation and control by controlling the raw material ratio and reaction conditions. The preparation method is simple in process and high in controllability, and the prepared octahedral cuprous oxide containing defects can serve as a catalyst to be applied to the fields of catalytic decomposition of ammonium perchlorate and the like and has good industrial application prospects.

The invention belongs to the technical field of drying, and relates to an ammonium perchlorate drying system and method. The drying system comprises a drying box, a hopper and a drying assembly. A connecting frame is arranged in the drying box, and the drying assembly comprises two transmission rollers rotationally mounted on the connecting frame and a drying belt wound between the two transmission rollers; a feed opening is formed in the hopper, and ammonium perchlorate in the hopper falls onto the drying belt through the feed opening; and a driving assembly is mounted on the drying box. Along with operation of the feeding roller and the drying belt, ammonium perchlorate evenly falls onto the drying belt, ammonium perchlorate accumulation is avoided, ammonium perchlorate can be continuously added to the drying belt along with drying, the drying efficiency can be improved, and dried ammonium perchlorate automatically falls into a collecting box. And the connecting frame vibrates in the length direction of the drying box and swings around the connecting column, so that the ammonium perchlorate on the drying belt is turned over, and the ammonium perchlorate is fully and comprehensively dried.

A system self-calibration method for testing granularity of spherical ammonium perchlorate by a dynamic image method relates to the field of particle granularity analysis and quality detection accuracy, and comprises the following steps: S1, calibrating an image acquisition module; s2, selecting proper standard sample particles; s3, calibrating the pixel size corresponding to the lens multiple; s4, testing accuracy self-correction verification of a dynamic image method particle size and shape analysis system is carried out, pixel accuracy calibration is optimized, and it is guaranteed that a standard particle testing result conforms to a standard particle special quantity value; and S5, establishing a dynamic image method particle size and particle shape analysis self-calibration standard curing method.

The invention discloses an ammonia borane solid propellant. The propellant takes octahydrotriboride as a fuel, ammonium perchlorate and the like as an oxidant, aluminum powder as a metal fuel and starch as an adhesive. The metal fuel and the adhesive which are good in compatibility are selected to form a propellant system, and the stability of the system is guaranteed while it is guaranteed that the system has the sufficient combustion effect.

The utility model relates to the technical field of a high-temperature combustion infrared thermal conductivity combined measurement method, in particular to a gas filtering structure of the high-temperature combustion infrared thermal conductivity combined measurement method, which comprises a mounting shell, one side of the mounting shell is communicated with a gas inlet pipe, the inner side of the mounting shell is fixedly connected with a filter screen which is arranged in an inclined manner, and the filter screen is fixedly connected with a gas outlet pipe. One side, far away from the air inlet pipe, of the mounting shell is communicated with a through pipe, the outer side of the through pipe is provided with a second valve, and the inner side of the mounting shell is fixedly connected with a positioning plate penetrating through one side of the mounting shell. One of the adsorption bottles is filled with asbestos, the other one of the adsorption bottles is filled with a magnesium perchlorate solution, solid particles in the gas are filtered out by the filter screen, then the alkali asbestos and the magnesium perchlorate solution in the adsorption bottles can adsorb CO2 and H2O respectively, and the filtered gas can flow out from the through pipe after the second valve is opened.

The invention provides a sample dissolving method of a nickel-based alloy, and belongs to the technical field of analytical chemistry, and the nickel-based alloy comprises the following components in percentage by mass: 0.15-0.20% of C, 0.15-0.20% of B, 0.15-0.20% of C, and the balance of Fe and inevitable impurities. Comprising the following steps: preliminarily dissolving a sample through concentrated hydrochloric acid and concentrated nitric acid; adding perchloric acid, and preserving heat for 1-2 minutes at the temperature of 100-120 DEG C to obtain a yellow insoluble substance, the ratio of the adding volume of the perchloric acid to the mass of the sample being (110-130) mL: 1g; transferring the liquid and the yellow insoluble substance into a second reaction cup, adding hydrofluoric acid, and keeping the temperature at 50-60 DEG C for 2-4 minutes; and fixing the volume after dissolving. Firstly, concentrated hydrochloric acid and concentrated nitric acid are adopted for dissolution, due to the fact that the content of Cr, Mo and W is high, and detection of Ce, Si and other metals cannot be affected, the adding mode of the concentrated nitric acid and the concentrated hydrochloric acid is limited, then perchloric acid is added, fuming of the perchloric acid is controlled, and the content of the perchloric acid and the content of the concentrated nitric acid which are added in the earlier stage are combined; the method has the advantages that low Cr content due to generation of CrO2Cl2 is avoided while metal carbides are dissolved, undissolved yellow substances are dissolved in combination with hydrofluoric acid, and low Si content due to generation of SiF4 is avoided.

The invention discloses vacancy heteropolyacid, a preparation method thereof and application of the vacancy heteropolyacid in electrolytic coupling hydrogen production, and belongs to the technical field of catalysts. The preparation method comprises the following steps: by taking phosphomolybdic acid as a raw material, preparing vacancy heteropolyacid by adjusting the pH value to 2-6 or adding high-concentration acid for acidification and heating; the high-concentration acid is 0.1-6 M phosphoric acid or a mixed acid of 0.1-3 M phosphoric acid and 0.1-6 M sulfuric acid or 0.1-1 M perchloric acid. The rate of oxidizing biomass and organic wastewater by the vacancy phosphomolybdic heteropolyacid prepared by the method is 10-20 times of that of complete Keggin type phosphomolybdic acid. The invention further provides an organic wastewater degradation and electrolytic hydrogen production coupling process, vacancy heteropoly acid can be regenerated and recycled, and coupling hydrogen production can be achieved.

The invention discloses a preparation method of ammonium perchlorate with a hollow spherical structure, which comprises the following steps: firstly, dissolving ammonium perchlorate in a high-temperature N, N-dimethylformamide solvent to form a high-temperature ammonium perchlorate saturated solution; then, adding a high-temperature saturated ammonium perchlorate solution into a low-temperature carbon tetrachloride anti-solvent at a slow feeding rate, and recrystallizing; and finally, completely crystallizing, standing, separating, washing and drying the product to obtain the ammonium perchlorate with the hollow spherical structure. The particle size of the obtained ammonium perchlorate with the hollow spherical structure is 50-100 microns, and the ammonium perchlorate is high in sphericity degree and good in dispersity. The ammonium perchlorate with the hollow spherical structure is applied to the fields of propellants, pyrotechnic compounds, thermite and the like.

The invention provides a hydrated eutectic electrolyte as well as a preparation method and application thereof. The electrolyte comprises water-soluble zinc salt, deionized water and a deep eutectic solution, the deep eutectic solution is formed by mixing zinc perchlorate and a polar deep eutectic solvent and performing deep eutectic crystallization. The electrolyte has the characteristics of low water activity, low freezing point and efficient induction of uniform deposition of zinc, can be compatible with an iodine-loaded positive electrode and can inhibit dissolution of iodine, and the characteristics are beneficial to inhibition of hydrogen evolution reaction, polyiodine shuttling and other side reactions in the battery circulation process, promote uniform deposition of zinc, protect the integrity of an iodine electrode, and improve the electrochemical performance of the battery. The stable operation of the zinc-iodine battery is ensured; the electrolyte is a zinc sulfate solution containing a ZnClO4 / dimethyl sulfoxide deep eutectic solvent, the solution is combined with free water to form a eutectic structure, the eutectic structure participates in construction of a Zn < 2 + > ion solvation shell, extra intramolecular hydrogen bonds are introduced for the electrolyte, meanwhile, hydrogen bonds among water molecules are weakened, so that the internal energy of the electrolyte is enhanced, the freezing point is reduced, and the flowability is improved.

The invention belongs to the technical field of optical glass. The invention relates to an electrochromic glass device, in particular to a preparation method of the electrochromic glass device. The preparation method comprises the following specific preparation steps: cleaning the surface of a glass substrate, and depositing an indium tin oxide transparent conductive layer on the surface of the glass substrate by adopting magnetron sputtering; the preparation method comprises the following steps: by taking nano spherical silicon dioxide as a template, dispersing the nano spherical silicon dioxide in an ethanol solution, then adding a sodium tungstate solution, then adjusting the pH value to 2-3, carrying out a stirring reaction, and then cleaning with a sodium hydroxide solution to remove the template so as to obtain a hollow spherical precursor dispersion liquid; coating the hollow spherical precursor dispersion liquid on the surface of the transparent conductive layer in a spin coating mode, drying and annealing; preparing a liquid electrolyte: taking propylene carbonate as a solvent, and taking lithium perchlorate as an electrolyte lithium salt; niO is deposited on the surface of the WO3 electrochromic layer to serve as a counter electrode through magnetron sputtering; epoxy resin is adopted to package the edge, after liquid electrolyte is injected, internal residual bubbles are removed through hot pressing, and the product is obtained.

The invention provides a medicament for treating wastewater containing perchlorate, which consists of two parts, namely a targeted remover and a guide activator, the core components of the targeted remover comprise dodecyl trimethyl ammonium chloride, dodecyl dimethyl benzyl ammonium chloride, hexadecyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride and the like. The guiding activating agent comprises one or more of polyferric sulfate, polyferric chloride, polyaluminum ferric chloride and polyaluminum ferric silicate. The treatment agent is simple in component, a large number of perchlorate-loving ion groups contained in the treatment agent can be fully combined with perchlorate in wastewater, the perchlorate is separated out from water in a precipitation mode and then is separated and removed, and the one-step removal rate reaches 95% or above.

The invention belongs to the technical field of metal material surface treatment, and discloses a composite preparation method of an ultrahigh-resolution-rate alpha + beta phase region thermal deformation high-strength titanium alloy EBSD sample, which comprises the following steps: mechanically grinding a to-be-tested surface of the alpha + beta phase region thermal deformation high-strength titanium alloy EBSD sample; performing electrolytic polishing in an electrolytic polishing solution which is prepared from perchloric acid and absolute ethyl alcohol and is naturally cooled to room temperature, and then performing four-stage short-time ion beam etching to obtain an ultrahigh-resolution-rate alpha + beta phase region thermal deformation high-strength titanium alloy EBSD sample; and ion beam etching parameters of each stage of the four-stage short-time ion beam etching are given. The technical problem that in the prior art, a preparation method of an alpha + beta phase region thermal deformation high-strength titanium alloy EBSD sample with the ultrahigh resolution rate (the resolution rate is 98% or above) does not exist is solved.

The invention discloses a preparation method of an ammonium perchlorate microrod with a uniform morphology. The preparation method comprises the following steps: firstly, heating a triethylene glycol saturated solution of ammonium perchlorate under a room temperature condition to a preset high temperature; then adding the high-temperature ammonium perchlorate saturated solution into an acetic acid anti-solvent at a certain temperature at a certain feeding rate for recrystallization; and finally, standing, separating, washing and drying the product to obtain the ammonium perchlorate microrod. The obtained ammonium perchlorate microrod is regular in morphology, good in dispersity and uniform in size, the length is 40-60 microns, and the width is about 10 microns. The method has the advantages of being high in operability, good in repeatability, easy to industrialize and the like.

The invention relates to a method for identifying soapberry from soapberry peel based on ultraviolet-visible spectrophotometry. The method is characterized by comprising the following steps: preparing a saponin solution, adding a 5% vanillin-glacial acetic acid solution and perchloric acid, uniformly shaking, heating in a constant-temperature water bath kettle at 70 DEG C for 15 minutes, cooling in an ice-water bath for 3 minutes, adding 5mL glacial acetic acid as a solvent, and measuring the characteristic absorption spectra of the vanillin and the glacial acetic acid by adopting an ultraviolet and visible spectrophotometer. And by utilizing the obvious difference of the number, the peak pattern and the position of the characteristic peaks in the absorption spectrum, the simple and rapid identification of the two is realized. The method has the advantages that the mass of required raw materials is small, the operation is simple, the process flow is short, and the experimental conditions are easy to realize. The technology is a rapid and efficient method for identifying and identifying the pericarp, pericarp powder and pericarp extract of the Sapindus maxima and the Sapindus mukorossi.

The invention discloses a negative electrode electrolyte and an acidic tin-bromine flow battery, and belongs to the technical field of energy storage. The negative electrode electrolyte provided by the invention comprises an active substance and a supporting electrolyte, the active substance comprises tetravalent tin salt; the tetravalent tin salt is selected from at least one of tin tetrachloride, tin sulfate, tin bromide and stannate; the supporting electrolyte is selected from at least one of sulfuric acid, hydrochloric acid, perchloric acid, methanesulfonic acid, hydrobromic acid and hydriodic acid. According to the acidic tin-bromine flow battery provided by the invention, a proper tin ion ligand is selected in the negative electrode electrolyte, and the formed tin-based complex can effectively improve the redox kinetics of Sn < 4 + > / Sn < 2 + > and improve the efficiency of the tin-bromine flow battery. Besides, the modification of the negative electrode can further improve the adsorption of reactive active substances and improve the electron transfer rate, and the high specific surface area can provide more active sites, so that the reaction polarization is reduced and the battery performance is improved.

The invention discloses a preparation method and application of a fluorine-doped carbon material, and relates to a preparation method and application of a carbon material. The method comprises the following steps: 1, preparing a sodium fluoride solution; 2, dropwise adding perchloric acid into the sodium fluoride solution to obtain a mixed solution; 3, adding a carbon material into the mixed solution; and 4, carrying out hydrothermal reaction to obtain the fluorine-doped carbon material. By optimizing the preparation process of the fluorine-doped carbon material, the compactness and uniformity of the protective layer are realized, the corrosion resistance and cycling stability of the zinc negative electrode are remarkably improved, and an important technical support is provided for large-scale application of the water-based zinc ion battery. The prepared zinc negative electrode with the fluorine-doped carbon coating on the surface is used as a negative electrode of an aqueous zinc ion battery. The fluorine-doped carbon material prepared by the invention can effectively improve the corrosion resistance and cycling stability of the zinc negative electrode, and provides technical support for large-scale application of the water-based zinc ion battery.

The invention discloses a preparation method of large-particle-size ammonium perchlorate hollow microspheres, which is characterized in that pyridine is used as a solvent, butyl octadecenoate is used as an anti-solvent, and the ammonium perchlorate hollow microspheres are obtained by using an anti-solvent crystallization method. The particle size of the obtained large-particle-size ammonium perchlorate hollow microspheres is 100-200 microns, the sphericity degree is high, and the dispersity is good. The method disclosed by the invention is simple in preparation process, simple and convenient to operate and very suitable for large-scale production.

The invention relates to the technical field of element detection, in particular to a method for measuring the manganese content in copper concentrate, which comprises the following steps: weighing a copper concentrate sample with the mass of m in a tetrafluoroethylene beaker, and adding a small amount of water to soak the sample; adding nitric acid and hydrochloric acid, and heating at 200-300 DEG C for 5-10 minutes; then adding perchloric acid and hydrofluoric acid, heating at 200-300 DEG C until the copper concentrate sample is completely dissolved, and cooling to room temperature; adding dilute nitric acid, and heating to dissolve the separated salt crystals to obtain a to-be-detected pre-solution; transferring the to-be-detected pre-solution to a volumetric flask, adding water to dilute the pre-solution to a scale line, and uniformly shaking to obtain a to-be-detected solution; according to the method, a nitric acid-hydrochloric acid-perchloric acid-hydrofluoric acid mixed acid digestion system is adopted, so that the manganese element in the copper concentrate is completely dissolved, and the interference of a complex matrix on manganese determination is effectively solved; by combining the high sensitivity and multi-element analysis capability of the inductively coupled plasma emission spectrometer, a linear standard curve of a manganese element characteristic spectral line and concentration is established, and the accuracy and precision of quantitative analysis are remarkably improved.

The invention relates to the technical field of metal material transmission electron microscope sample preparation, in particular to a method for removing an oxide layer on the surface of a silicon steel transmission electron microscope film sample. The metal wafer is subjected to electrolysis double-spraying, and the double faces are evenly thinned; the electrolyte is formed by mixing perchloric acid and an absolute ethyl alcohol solution; liquid nitrogen is used for cooling the electrolytic cell; cleaning the metal wafer in absolute ethyl alcohol; and the cleaned metal wafer is vacuumized. The method has the advantages that the electrolytic double-spraying thinning method is combined with the ion thinning method, reasonable working parameters are selected and an oxide layer on the surface of the sample is cleaned by utilizing ion thinning on the basis that the electrolytic double-spraying sample is perforated to obtain a good thin area, so that a high-quality and high-precision metal film sample is obtained; powerful support is provided for silicon steel product mechanism research; the sample preparation speed is high, and the sample preparation cost is low; the thin area is large, the oxide layer is removed, the thin area of the cut sample is very small, the ion thinning is the second time, and the electrolytic double-spraying thin area is the largest.

The invention discloses an MXene (at) PDA / Cu NPs composite material and a preparation method of the MXene (at) PDA / Cu NPs composite material. The method comprises the following steps: placing an MAX material in an HCl solution of LiF, stirring, etching and stripping to obtain few-layer MXene; then, a few layers of MXene are dispersed in a Tris-HCl buffer solution, dopamine hydrochloride is added, and MXene (at) PDA is obtained through a self-polymerization reaction; and finally, adding copper nitrate, sodium hydroxide and an ascorbic acid solution into the aqueous dispersion of the MXene (at) PDA, and carrying out reduction reaction to obtain the MXene (at) PDA / Cu NPs composite material. A low-temperature in-situ reduction method is adopted, the preparation process is simple, conditions are mild, a large number of organic chemical reagents are not needed, the thermal decomposition temperature of ammonium perchlorate is reduced by 108.4 DEG C through the prepared MXene (at) PDA / Cu NPs composite material, and the MXene (at) PDA / Cu NPs composite material has an excellent catalytic effect on ammonium perchlorate.

The invention relates to an ammonium ion selective electrode, a preparation method thereof and application of the ammonium ion selective electrode in detection of ammonium ions in black and odorous water, and belongs to the field of electrochemical detection sensors. The method comprises the following steps: dispersing graphene oxide into water to obtain a dispersion liquid, and mixing the dispersion liquid with a Nafion solution to form a graphene oxide-Nafion mixed solution; coating on a substrate electrode, and drying to obtain a substrate electrode I; the substrate electrode I is placed in an electroplating solution for constant-current electrodeposition, and an ion selective electrode containing a solid contact layer is obtained; the electroplating solution contains 3, 4-ethylenedioxythiophene, a hydrophobic organic matter and lithium perchlorate; and dropwise adding an ammonium ion sensitive solution on the surface of the ion selective electrode containing the solid contact layer, and standing for 20-30 hours to obtain the ammonium ion selective electrode. The method is simple in preparation process, large-scale production can be achieved, the service life of the electrode is prolonged, the sensitivity of the electrode is improved, and meanwhile the stability of the electrode in fluid and the reliability of real-time monitoring are improved.

The present invention discloses a copper-containing hydrogen-bond organic framework material, a preparation method, and an application thereof. The method comprises the following steps: mixing trimesic acid, melamine, and a copper salt and dispersing them in a solvent to obtain a mixed suspension; transferring the mixed suspension to a reactor for reaction to obtain a copper-containing hydrogen-bond organic framework material solution; cooling the copper-containing hydrogen-bond organic framework material solution, centrifuging it, and then post-treating the copper-containing hydrogen-bond organic framework material solid obtained by centrifugation to obtain a copper-containing hydrogen-bond organic framework material with a one-dimensional rod-shaped structure. When used in the thermal decomposition catalysis of ammonium perchlorate, the copper-containing hydrogen-bond organic framework material prepared by the present invention can exhibit high catalytic activity and stability, thereby concentrating the exothermic temperature range and heat release of ammonium perchlorate.

This invention discloses a method for dissolving NiCrPSi nickel alloy samples for ICP-OES detection, comprising the following steps: mixing the NiCrPSi nickel alloy sample to be tested with hydrochloric acid aqueous solution, concentrated nitric acid, and hydrofluoric acid aqueous solution, digesting at 120-140℃ for 1.5-2.5h, and then evaporating the solution to dryness at 220-260℃; then adding nitric acid aqueous solution and heating until the solid is completely dissolved, and then diluting with water to obtain the NiCrPSi nickel alloy test solution. The dissolution method of this invention can completely dissolve NiCrPSi nickel alloy powder without elemental loss, providing an accurate sample solution for ICP-OES detection; and it eliminates the need for specialized equipment such as microwave digesters or electrothermal digesters, as well as special reagents such as perchloric acid and tartaric acid, using only conventional acid reagents and general experimental equipment, thus reducing costs, simplifying operation, and enhancing versatility.

The invention discloses an ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometer) method for determining the content of cerium in aviation gear steel. The method comprises the following steps: setting working parameters of an inductively coupled plasma emission spectrometer; determining the blank solution and the cerium standard solutions under different concentrations by using an inductively coupled plasma emission spectrometer, and drawing a cerium element concentration standard curve; determining a to-be-determined sample solution by using the inductively coupled plasma emission spectrometer, and then determining the content of the cerium element in the to-be-determined solution by combining the cerium element concentration standard curve. According to the method, the content of the cerium element in the aviation gear steel is accurately measured, meanwhile, it is guaranteed that other elements are accurately measured, no element loss is generated, and compared with a steel mill test result, a sulfuric acid-phosphoric acid fuming method, a perchloric acid fuming method and a spectrophotometric method, the difference is small, precision is high, and accuracy and reliability are achieved.

This invention relates to a method for synthesizing an acid-base indicator from cellulose. The method involves mixing a cellulose raw material with a non-volatile acid, heating and carbonizing the mixture in high-temperature air, washing the carbonized material with water, neutralizing the suspension with alkali, filtering to remove inorganic salts, and evaporating the water to obtain the acid-base indicator. The cellulose raw material is cellulose and / or materials containing cellulose, and the non-volatile acid includes one or more of sulfuric acid, phosphoric acid, perchloric acid, benzenesulfonic acid, p-toluenesulfonic acid, and benzoic acid. This invention utilizes non-toxic, harmless, and low-cost cellulose as a raw material to prepare the acid-base indicator through a simple and environmentally friendly production process. The synthesis technology has advantages such as low raw material price and easy availability, simple preparation process, no environmental pollution, and easy product separation.

A quantitative detection method of thallium content in converter graphite ball, steps include: 1) the pretreatment of converter graphite ball; 2) the preparation of standard solution series; 3) the detection of thallium content in converter graphite ball.The application finds that the suitable pretreatment method of converter graphite ball is carbon removal by burning, and then high-chloric acid and dilute nitric acid are used to dissolve salt, by which the converter graphite ball can be completely dissolved, thereby the stability of quantitative determination of thallium content in converter graphite ball is improved, the pretreatment method is simple, fast and operable; the method is suitable for the quantitative detection of thallium content in converter graphite ball with thallium content not less than 0.0062 μg / L, the recovery rate of thallium is as high as 99.1%, the analysis accuracy is high, the detection lower limit is as low as ppb level, the sensitivity is high, and the method has the advantages of simple operation, simple analysis condition and low labor intensity.Therefore, the application has significant economic benefits and the advantages of simplicity and economy.

The invention relates to the technical field of combustion agents and preparation processes thereof, in particular to a high-reaction-pressure silicon-based pyrotechnic composition and a preparation process thereof.The high-reaction-pressure silicon-based pyrotechnic composition is prepared from metal powder, metal fluoride, a gas generating agent and a binder; porous silicon powder is adopted as the metal powder, one or more of ferric fluoride and copper fluoride is adopted as the metal fluoride, ammonium perchlorate is adopted as the gas generating agent, and one or more of epoxy resin and polyether amine is adopted as the binder. When the high-reaction-pressure silicon-based pyrotechnic composition is prepared, silicon is used for replacing aluminum to serve as combustible metal, fluoride is used for replacing oxide, the boiling point of a reaction product is remarkably reduced and is far lower than that of aluminum oxide, and due to the fact that the boiling point of the reaction product is reduced, slag of the product is remarkably reduced.