44 results about "Ammonium thiocyanate" patented technology

The invention discloses lithium sulfide, a two-step double decomposition preparation method and application of the lithium sulfide in an all-solid-state battery, and belongs to the technical field of solid-state batteries. According to the preparation method, a two-step decomposition synthesis technology is adopted, lithium carbonate and ammonium thiocyanate are used as raw materials, the raw materials are uniformly mixed and then placed in a high-temperature reactor, a step heating sintering procedure is completed in an inert gas atmosphere, and the purpose of fully decomposing and converting the raw materials is achieved by accurately controlling the temperature and the time; after a product is obtained through reaction, the high-purity lithium sulfide material is obtained after the product is cooled to the room temperature. The method for preparing the lithium sulfide is low in raw material cost, simple in reactant formula and free of side reaction in the reaction process, and the finally generated product is few in impurity, high in purity and good in crystallinity.

The invention discloses an electrocatalytic ammonia synthesis system, which comprises a power supply module; the electrode partitions in the electrolytic bath are arranged into a core area electrode in the middle and an edge area electrode on the peripheral edge, and a negative electrode is connected with an edge electrode in a cathode chamber of the electrolytic bath through a shunt; the dynamic sulfur circulating unit is used for monitoring the potential offset of an electrode in the electrolytic cell and dynamically injecting an ammonium thiocyanate solution into a cathode chamber of the electrolytic cell according to the potential offset; and the current density partition control unit is used for controlling the current density of the current output by the power supply module to the core area electrode and the edge area electrode respectively. According to the invention, the essential problem of high nitrogen activation energy barrier is solved, the technical bottleneck of unsustainable proton transmission is overcome, the engineering limit adapted to wind-light-electricity fluctuation is broken through, the aperture control precision of the molecular sieve is improved, the sulfur vacancy regeneration efficiency is improved, the system fluctuation adaptability is optimized, and the current density tolerance upper limit is expanded.

The invention discloses a highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator for X-ray detection imaging and a preparation method of the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator, and relates to the technical field of radiation detection and scintillation materials, the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator comprises phenethyl ammonium bromide, cesium lead tribromide and ammonium thiocyanate, the molar ratio of the phenethyl ammonium bromide to the cesium lead tribromide to the ammonium thiocyanate is 2: 4: 2, the scintillator contains a methylamine thiocyanate additive which accounts for 0-1 equivalent weight of the dosage of the ammonium thiocyanate, and the scintillator is of a flaky polycrystal structure; the perovskite crystal of the polycrystalline wafer has a quasi-two-dimensional layered crystal structure, and each crystal grain is arranged in a height orientation manner, so that the layered crystal face is parallel to the main plane of the scintillator sheet. According to the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator for X-ray detection imaging and the preparation method of the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator, a highly-oriented layered structure is formed in the crystal, diffuse scattering of emergent light is greatly reduced, brightness uniformity and spatial resolution of X-ray imaging are improved, and a finer imaging effect is achieved.

The invention relates to the technical field of drilling, in particular to a preparation method of composite lubricating particles for drilling fluid and the drilling fluid, the drilling fluid is formed by compounding a multi-defect-state g-C3N4-MoS2 heterostructure and nano bentonite, g-C3N4 is prepared through a urea-ammonium thiocyanate eutectic supramolecular self-assembly and gradient calcination technology, and the composite lubricating particles are prepared through a composite lubricating agent. Introducing an N vacancy by adopting plasma treatment; moS2 is subjected to oriented epitaxial growth on the surface of g-C3N4-MoS2 through a microwave-assisted hydrothermal method; the nano bentonite is obtained by high-pressure homogenization and supercritical CO2 stripping. After the drilling fluid is subjected to multi-stage dispersion, experiments find that the friction coefficient is as low as 0.43 and is reduced by 52% compared with that of conventional drilling fluid, the abrasion loss is reduced by 97% or above, the friction resistance in the drilling process can be remarkably reduced, the service life of a drill bit can be prolonged, and the drilling fluid is particularly suitable for ultra-deep well drilling operation of shale gas, deep sea oil gas and the like.

The invention relates to the technical field of chemical preparation, in particular to a preparation method of gamma-thiocyano propyl triethoxy silane, which comprises the following steps: adding acetonitrile and tetrabutyl ammonium thiocyanate into a reaction container, dropwise adding 3-chloropropyl triethoxy silane into a four-mouth round-bottom flask while stirring, and controlling the dropwise adding time; the preparation method comprises the following steps: heating to 30-40 DEG C, reacting for 1.5-3 hours, cooling to room temperature, adding an ice-saturated sodium chloride solution into a reaction container to obtain a mixed solution, extracting the mixed solution, taking an organic layer, sequentially washing, drying and filtering, and respectively carrying out vacuum concentration and vacuum rectification on filtrate to obtain the gamma-thiocyano propyl triethoxy silane. The preparation method of the gamma-thiocyano propyl triethoxy silane provided by the invention is carried out under an anhydrous condition, so that hydrolysis and condensation side reactions of silane caused by a water-phase synthesis method are effectively avoided, meanwhile, the generation of irritant gases such as hydrogen sulfide and the like is avoided, and the preparation method is safer to operate, environment-friendly and more suitable for industrial popularization.

The application discloses a preparation method of a lead-tin mixed perovskite single crystal thin film and near-infrared detection application thereof, and relates to the technical field of photoelectric materials and devices. The method introduces an anti-solvent into a saturated precursor liquid to prepare a high-quality seed layer, and dynamically supplements a growth liquid in a key stage of space-limited growth, effectively solves a crystal boundary pore problem caused by solute depletion, and successfully prepares a dense, pore-free and continuous lead-tin mixed perovskite single crystal thin film. Further combined with precursor liquid concentration optimization, an ammonium thiocyanate additive and Me-4PACz interface modification, the defect state density of the thin film is significantly reduced.

The application provides a method for preparing calcium thiocyanate by using desulfurization waste liquid, calcium nitrate and ammonium thiocyanate are respectively dissolved into 30-50% solution, the calcium nitrate solution is slowly dropped into the hot ammonium thiocyanate solution under the conditions of heating and stirring, under the heating state, the double decomposition reaction occurs to generate calcium thiocyanate and ammonium nitrate, with the continuous heating and the evaporation of water, the concentration of calcium thiocyanate gradually increases, the ammonium nitrate is heated and decomposed to generate nitrogen oxide and ammonia gas, the generated process gas rich in nitrogen oxide and ammonia gas is condensed and introduced into the coking ammonia removal and denitration section for treatment, and finally the evaporation and concentration obtain about 50% calcium thiocyanate product. The method uses industrial waste to provide raw materials, and the production cost is low; the process tail gas generated in the reaction only needs to be treated by the existing ammonia removal and denitration device of the coking enterprise, without increasing additional equipment, thereby saving the expenditure; and the method has environmental protection benefit, social benefit and economic benefit.

This invention discloses a method for the synergistic treatment of kiln tail ash powder and secondary washing film filtrate, comprising the following steps: S1, dissolving an ionic emulsifier in water, then adding kiln tail ash powder, heating and dispersing evenly to obtain a kiln tail ash powder dispersion; S2, adding dilute sulfuric acid and heating, causing the iron in the kiln tail ash powder dispersion to react with the dilute sulfuric acid to generate soluble ferric sulfate, thus obtaining a kiln tail ash powder ferric sulfate dispersion; S3, adding the secondary washing film filtrate, causing the ferric sulfate to be reduced to ferrous sulfate, filtering, and washing with water until no color change is observed when hydrogen peroxide and ammonium thiocyanate are added to the filtrate. This invention utilizes the secondary washing film filtrate of waste to treat kiln tail ash powder, while simultaneously adding multiple ionic emulsifiers. Under synergistic treatment, the iron content in the kiln tail ash powder meets the requirements, achieving titanium dioxide recycling and bringing significant economic benefits, while saving the cost of treating the waste secondary washing film filtrate.

The present invention discloses a treatment agent for removing nitric acid from dilute sulfuric acid and a preparation and use method thereof, belonging to the technical field of coking wastewater treatment. The treatment agent for removing nitric acid from dilute sulfuric acid is composed of a carrier and a reactive component; the carrier is an activated corn cob, and the carrier accounts for 50% to 70% of the total mass of the treatment agent; the reactive component is prepared by mixing ammonium thiocyanate, ammonium thiosulfate, and urea in a mass ratio of 6 to 8:1 to 2:1 to 2. The nitric acid treatment agent is used to treat the mixed acid, thereby increasing the utilization rate of the dilute acid and the yield of ammonium sulfate. The present invention effectively solves the problem of increased operating costs caused by the waste of impure dilute sulfuric acid in waste liquid acid production, equipment corrosion, foaming, and destruction of ammonium sulfate crystals.

The application discloses a composite material, a film and a preparation method thereof, an optoelectronic device and a display device. The composite material comprises an organic semiconductor material and an ammonium thiocyanate salt. The composite material has a high carrier mobility.

The utility model relates to a device for optimizing co-production of acid and ammonium thiocyanate from desulfurization waste liquid. The device comprises a tank body and a cover body, a jacket is arranged on the outer wall of the tank body, a cooling cavity is formed between the jacket and the outer wall of the tank body, a medium inlet and a medium outlet are formed in the jacket, and the medium inlet and the medium outlet are both communicated with the cooling cavity; a filter plate is arranged in the tank body; an ammonium thiocyanate mother liquor outlet and a sulfo-impurity discharge hole are formed in the lower part of the side wall of the tank body; and the cover body is provided with a sulfur-containing concentrated solution inlet and a backwashing solution inlet. The device is not provided with an incineration structure and procedure, the problem that high-added-value ammonium thiocyanate is incinerated in the existing process of preparing acid from desulfurization foam and desulfurization waste liquid is solved, the problem that nitric oxide is too high in the acid preparation incineration process is solved, and therefore the problem that the content of nitrate in finished acid is too high is solved; according to the device, the process of preparing ammonium thiocyanate from the sulfur-containing concentrated solution and the process of preparing the sulfur-containing waste solution for acid making are integrated through the device, so that the process energy consumption is reduced, and the resources and the cost are saved.

The invention relates to a method for detecting the content of Tween 80 in a nasal spray by using a colorimetric method and application. The method comprises the following steps: pretreating a to-be-detected sample, adding a cobalt ammonium thiocyanate solution, carrying out a chromogenic reaction, adding an extracting agent, and carrying out determination. According to the method, the nasal spray is pretreated, so that the influence of other substances on Tween 80 detection is reduced, and the detection accuracy is remarkably improved.

The acid-base indicator has important application in the fields of chemical industry, food, medicine and the like, so that a plurality of inorganic and organic acid-base indicators are invented by people. The invention prepares two novel acid-base indicators with similar processes and properties. The method specifically comprises the following steps: firstly, dissolving chitosan by using an aqueous solution of lactic acid, then adding a ferrous sulfate solution into the solution, and dialyzing and standing to obtain a solution containing ferrous ions. Adding potassium ferricyanide into the solution to obtain an indicator A; adding ammonium thiocyanate and a small amount of sulfuric acid into the indicator A to obtain an indicator B; the two indicators are blue and faint yellow when the pH value is 9-10 or above. Wherein the indicator B can still turn blue after being added into the acid solution again.

The invention belongs to the technical field of waste treatment in the coking industry and relates to a deep processing process for sulfur paste, a by-product of coke oven gas desulfurization. The process comprises the following steps: decolorization of the sulfur paste, first centrifugal filtration, acidification and impurity removal, preparation of sodium thiosulfate, second centrifugal filtration, concentration and precipitation of ammonium sulfate and ammonium thiocyanate, centrifugal separation, concentration of sodium thiosulfate, crystallization of sodium thiosulfate, first separation of sodium thiosulfate pentahydrate, purification of sodium thiosulfate pentahydrate and second separation of sodium thiosulfate pentahydrate. Through efficient conversion, separation and impurity removal, the solid waste sulfur paste can be processed into high-value-added sodium thiosulfate pentahydrate crystals, thereby truly realizing high-quality resource utilization of pollutants.

The invention relates to the technical field of high polymer materials, in particular to a transparent polyester base material for a window film, a preparation method and application. The transparent polyester base material for the window film comprises an acrylic resin coating and a polyester film, the polyester film sequentially comprises an outer surface layer, a middle core layer and an inner surface layer from top to bottom, and the outer surface of the outer surface layer is coated with the acrylic resin coating online; the acrylic resin coating is prepared from the following raw materials in parts by weight: 70 to 80 parts of polymethyl methacrylate, 0.5 to 5 parts of ammonium thiocyanate, 4 to 18 parts of melamine, 1 to 5 parts of glycol ether, 2 to 8 parts of colloidal silicon dioxide, 1 to 3 parts of an ultraviolet light absorber, 0.5 to 2 parts of nano-silver particles and 3 to 7 parts of a toughening agent.

The invention discloses a thiourea acylthiourea metal complex catalyst, a preparation method thereof and application of the thiourea acylthiourea metal complex catalyst in lactide ring-opening polymerization. The preparation method comprises the following steps: (1) condensing 3, 5-bis (trifluoromethyl) phenyl isothiocyanate and para aminobenzoic acid in dichloromethane to obtain a carboxyl-containing product A; (2) performing acylating chlorination on the product A to obtain an intermediate B; (3) reacting the intermediate B with ammonium thiocyanate to generate an isothiocyanate intermediate C; (4) reacting the intermediate C with chiral primary amine to obtain a ligand intermediate D with a chiral center; and (5) coordinating the ligand intermediate D with a zinc compound or a titanium compound in an organic solvent to obtain the target catalyst. Molecules of the catalyst contain a chiral thiourea unit and an acylthiourea metal chelating unit at the same time, so that a monomer and an initiator can be activated synergistically. When being used for ring opening polymerization of lactide, the polylactic acid with high stereoregularity and narrow molecular weight distribution can be efficiently prepared at room temperature; the carbon nanotubes are added into a reaction system, so that the polylactic acid composite material with conductivity can be obtained.

The application provides a desulfurization waste liquid treatment method, and belongs to the technical field of waste water treatment. The desulfurization waste liquid is subjected to step-by-step salt extraction to obtain ammonium thiosulfate, ammonium thiocyanate and ammonium sulfate; the ammonium thiosulfate is purified by using ethanol to obtain pure ammonium thiosulfate; the ammonium thiocyanate is purified by using ethyl acetate-acetone and ethyl acetate step by step to obtain pure ammonium thiocyanate; and the ammonium sulfate is purified by using a water-acetone mixed solution to obtain pure ammonium sulfate. The application first subjects ammonium thiosulfate, ammonium thiocyanate and ammonium sulfate in the desulfurization waste liquid to rough extraction by using step-by-step salt extraction, and then subjects the ammonium thiosulfate, ammonium thiocyanate and ammonium sulfate to purification by using specific solvents, so that pure ammonium thiosulfate, pure ammonium thiocyanate and pure ammonium sulfate with high purity are obtained, and the added value of the products is effectively improved.

The invention discloses a method for determining chloride ions in an ammonia chloride process electrolytic zinc solution, and relates to the technical field of determination methods, and the method comprises the following steps: preparing a subacid sample solution; adding a quantitative silver nitrate standard solution; heating to a slight boiling state for 1-2 minutes, and cooling to room temperature; adding an indicator; titrating excessive silver nitrate with the ammonium thiocyanate standard solution, determining a titration end point according to the change of the indicator, and recording the consumption volume of the ammonium thiocyanate standard solution; carrying out a blank experiment, and recording the consumption volume of the ammonium thiocyanate standard solution; and calculating the concentration of chloride ions in the chlorine-containing solution according to a titration result. According to the method, a quantitative silver nitrate standard solution is added into a subacid sample solution, chloride ions become silver chloride precipitates, an indicator is added, and excessive silver nitrate is titrated with an ammonium thiocyanate standard solution, so that the concentration of the chloride ions in the electrolytic zinc solution can be accurately and quickly measured, the detection speed is increased, and the detection accuracy is improved. And errors caused in the dilution process of the spectrophotometric method are reduced.

The invention belongs to the technical field of organic synthesis methodology, and particularly relates to a visible light promoted aliphatic primary amine compound synthesis method and application, the method uses substituted sulfonium salt and substituted styrene as raw materials, ammonium thiocyanate as an amine source, alkali as an additive, an organic solvent is added, reaction is carried out in inert gas at a certain temperature, and the visible light promoted aliphatic primary amine compound is obtained. Under visible light, under the catalytic action of a metal copper complex, the aliphatic primary amine compound is prepared. The method is mild in reaction condition, safe, green and environment-friendly, can be completed in one step, and accords with atom economy and step economy. The aliphatic amine compound and the derivative thereof prepared by the method are expected to serve as lead compounds to be applied to the research and development fields of anti-tumor and antibacterial drugs and the like.

The invention relates to the technical field of a continuous aqueous solution method for continuously synthesizing thiourea from ammonium thiocyanate, in particular to a thiourea continuous synthesis system and method, which comprises a raw material storage unit, a tubular reactor group, an ion resin exchange column unit, a concentration crystallizer, a solid-liquid separator and a continuous dryer which are arranged in sequence, the layered ion resin exchange column unit is used for replacing an existing ion exchange column and is applied to the continuous synthesis system of the thiourea, so that when a thiourea mixed solution is separated, the upper, middle and lower layers of ion resin in the ion resin exchange column unit can participate in a purification and separation reaction at the same time, the continuous synthesis efficiency of the thiourea is effectively improved, and the continuous synthesis efficiency of the thiourea is improved. And in the purification and separation process, the thiourea solution separated from the upper layer and the middle layer does not have any influence on the separation work of the ion resin on the lower layer.

The invention discloses a cyclopropane skeleton derivative rich in unsaturated functional groups as well as a preparation method and application thereof, aldehyde, acyl acetonitrile and ammonium thiocyanate are taken as template substrates, 1, 1, 1, 3, 3, 3-hexafluoropropan-2-ol is taken as an additive, ferrocene is taken as a catalyst, 1, 4-diazabicyclo [2.2. 2] octane is taken as alkali, tetrabutyl amine tetrafluoroborate is taken as electrolyte, acetonitrile is taken as a solvent, and the cyclopropane skeleton derivative rich in unsaturated functional groups is prepared through a one-step reaction. Under the condition of room temperature, carbon rods are used as an electrode cathode and an electrode anode, a reaction mixture is firstly stirred and then reacts in an unseparated electrolytic tank at a constant current of 3mA for 4 hours, and the carbon-carbon composite material is prepared. The technical scheme of the invention provides a new thought for widening the chemical structure and synthesis methodology of the cyclopropane skeleton compound.

The invention discloses a polyacyl dithiocarbamate compound as well as a preparation method and application thereof. The structural formulas of the polyacyl dithiocarbamate compounds are shown as a formula I, a formula II and a formula III, the preparation method comprises the following steps: mixing ammonium thiocyanate, a bilateral acyl chloride compound and a first organic solvent in a protective atmosphere, and then carrying out substitution reaction to obtain a mixed solution containing an intermediate product; the obtained mixed solution containing the intermediate product, a polythiol compound and a second organic solvent are mixed and then subjected to an addition reaction, and the polyacyl dithiocarbamate compound is obtained. The raw materials involved in the preparation method can be commercially purchased, the cost is low, the method is simple, the atom economy is high, and large-scale preparation can be carried out. And moreover, the synthesized polyacyl dithiocarbamate has good refraction property, metal ion adsorbability and degradability.

The invention provides a method for determining the quality and purity of silver in a ceramic cup with a silver layer on the inner wall, and relates to the technical field of precious metal analysis and detection. In order to solve the technical problems that a silver layer cannot be stripped by an existing physical method and a ceramic matrix bismuth element interferes with purity determination in a chemical method, silver-free ceramic cups of the same batch are adopted as specific blank control, and a salpeter solution with an optimized proportion is utilized to synchronously digest a silver-layer-containing sample and a blank sample under the conditions of specific temperature and time. The mass of silver is accurately measured through an ammonium thiocyanate titration method, the impurity concentration in a sample solution and the impurity concentration in a blank solution are respectively measured in combination with a spectrum method, background interference such as bismuth dissolved out of ceramic is accurately deducted through a subtraction method, and finally the silver purity is obtained through normalization calculation. According to the method, continuous and accurate determination of the quality and purity of silver can be realized through one-time sample dissolution, the problem of interference of a complex matrix is effectively solved, the precision and accuracy of detection are remarkably improved, and a feasible technical scheme is provided for quality detection of the ceramic product containing the silver layer.

The invention provides a novel environment-friendly biological liquid bone glue preparation process, and relates to the technical field of biological environment-friendly material preparation. The preparation process of the novel environment-friendly biological liquid bone glue comprises the following steps: preparing the following raw materials: 90g of bone glue, 100g of water, a proper amount of protease, 8g of acrylic acid, 7.6 g of ammonium thiocyanate, 10ml of methanol and 10ml of coral dealbatus extracting solution; decomposing the bone glue, namely adding 90g of bone glue into a 500ml volumetric flask, adding 100g of water, uniformly stirring to fully dissolve the bone glue, adding a proper amount of protease, carrying out enzymolysis reaction at normal temperature, and uniformly stirring; heating in a water bath: putting the bone glue solution subjected to enzymolysis into a water bath kettle, heating to 80 DEG C, keeping stirring in the heating process to ensure that the temperature is uniform, and keeping the temperature for 10 minutes after heating to 80 DEG C to promote the complete proceeding of the enzymolysis reaction. Unsaturated monomers such as acrylic acid are introduced for chemical crosslinking, so that the mechanical strength and stability of the bone glue are remarkably improved.

The present application relates to the technical field of chemical wastewater recycling treatment, and discloses a method and device for extracting ammonium thiocyanate. The method comprises the following steps: performing primary solid-liquid separation on a mixed solution of pretreated high-purity vanadium wastewater and coal gas desulfurization waste salt to precipitate anhydrous sodium sulfate; performing secondary solid-liquid separation on the solution after the primary solid-liquid separation to precipitate a mixed salt of sodium sulfate and ammonium sulfate; and performing tertiary solid-liquid separation on the solution after the secondary solid-liquid separation to obtain ammonium thiocyanate. The method can solve the problems of efficient treatment of high-purity vanadium wastewater and difficulty in treatment or resource utilization of coke oven gas desulfurization waste residue, so as to achieve waste treatment with waste and resource recycling, and greatly reduce the treatment investment cost and operation cost of the two pollutants.

The invention belongs to the technical field of photoelectric materials and devices, and particularly relates to a wide-band-gap perovskite solar cell for indoor photovoltaic and a preparation method of the wide-band-gap perovskite solar cell. Ammonium thiocyanate is added into a wide-band-gap perovskite precursor solution to serve as an additive, and the wide-band-gap perovskite type light absorption layer is formed through solution deposition and annealing treatment. Ammonium thiocyanate is added into a wide-band-gap perovskite precursor solution to serve as an additive, crystallization kinetics is delayed through the strong coordination effect of SCN <-> and Pb < 2 + >, and thin film defects are passivated synergistically. The obtained perovskite thin film has the advantages of large crystal grain, high crystallinity and low defect density, so that the prepared solar cell has extremely high open-circuit voltage and photoelectric conversion efficiency under indoor weak light, and is particularly suitable for supplying energy to micro-electronic equipment such as an Internet of Things sensor and the like.

Provided is a steel sheet which has a specific chemical composition, in which the number density of recesses that have a depth of more than 2 μm and an apex angle of 45° or less in the surface is 10.0 / mm or less, and which satisfies H100-200 / H20-300 < 0.30 (in the formula, H100-200 is the hydrogen release amount from 100°C to 200°C, and H20-300 is the hydrogen release amount from 20°C to 300°C) when the steel sheet is immersed in an aqueous ammonium thiocyanate solution having a concentration of 100 g / L at 25°C for 48 hours, and subsequently the hydrogen release amount is measured by temperature desorption spectroscopy by heating the steel sheet from room temperature to 300°C at a temperature increase rate of 100°C / h. Also provided is a method for producing the same.

The utility model discloses a system for measuring the content of chloride ions in urea for a power plant, which is characterized in that a heater is positioned on a weighing sensor, a measuring reaction cup is positioned on the heater and is of a transparent structure, and a liquid level sensor and a color sensor are arranged on the outer wall of the measuring reaction cup; a stirrer and a temperature sensor are arranged in the measuring reaction cup, and a sample adding hopper is arranged at the top of the measuring reaction cup; an outlet of the high-purity water tank, an outlet of the nitric acid solution tank, an outlet of the silver nitrate solution tank, an outlet of the dibutyl phthalate tank, an outlet of the ammonium ferric sulfate solution tank and an outlet of the ammonium thiocyanate solution tank are communicated with the measurement reaction cup. The system can accurately measure the content of chloride ions in urea.

A material having a specified chemical composition, in which the number density of recesses on the surface with a depth of more than 2 μm and a vertex angle of 45 degrees or less is 10.0 / mm or less, and which is immersed in an aqueous solution of ammonium thiocyanate with a concentration of 100 g / L at 25°C for 48 hours, and then heated from room temperature to 300°C at a heating rate of 100°C / h by thermal desorption analysis, shows no hydrogen release. 100-200 / H 20-300 <0.30 (in the formula, H 100-200 is the amount of hydrogen released at 100-200°C, H 20-300 The present invention provides a steel sheet that satisfies the above requirements (amount of hydrogen released at 20 to 300°C) and a method for manufacturing the same.

The application discloses a detection structure capable of quickly identifying ferroferric oxide, and a preparation method and application thereof. The detection structure comprises a base body, and potassium ferricyanide and ammonium thiocyanate which are respectively adsorbed on opposite ends of the base body. The detection structure can quickly identify whether the ferroferric oxide is contained in a to-be-detected substance. The detection structure has low detection limit, high accuracy and simple operation.