92 results about "Sodium tungstate" patented technology

The invention relates to the technical field of cable preparation, in particular to a low-temperature-resistant flame-retardant anti-ultraviolet PVC cable sheath composition, a preparation method thereof and a cable. According to the composition, polyvinyl chloride is used as a matrix, chlorinated polyethylene elastomer, an environment-friendly plasticizer and a calcium-zinc stabilizer are used as auxiliary materials, nanoscale magnesium hydroxide, zinc stannate, passivated zinc borate, sodium tungstate and modified montmorillonite are introduced to form a multi-component synergistic flame-retardant system, and the flame retardance, the low smoke property and the thermal stability of the material are remarkably improved. Meanwhile, through the cooperation of the ultraviolet light absorber and the antioxidant, the weather resistance of the material is enhanced, and the service life of the material is prolonged. The prepared cable sheath material has excellent low-temperature flexibility, flame retardance and smoke suppression performance and ultraviolet aging resistance, and is suitable for high-performance cables in severe environments.

The invention discloses a high-performance thermosetting resin plugging material, a preparation method and a water-based drilling fluid, and relates to the technical field of oilfield chemistry, and the preparation method of the plugging material comprises the following steps: stirring an aromatic compound containing two double bonds with sodium tungstate, a transfer catalyst and a hydrogen peroxide solution at room temperature for reaction, and purifying to obtain an epoxy compound; the preparation method comprises the following steps: heating an aromatic compound containing an aldehyde group, ammonium formate and a palladium-carbon catalyst with nitrogen to react to obtain an amine compound, transferring the epoxy compound and the amine compound into a size-adjustable mold, carrying out heating curing treatment, carrying out low-temperature ball milling on a crude product to obtain plugging material particles, and preparing the water-based drilling fluid by using the plugging material particles. The specific aromatic rigid framework monomer is selected, and the molar ratio of epoxy to the curing agent is accurately controlled, so that the mechanical strength and thermal stability of the material are remarkably optimized, and the plugging material has a good treatment effect on cracks and pores in complex stratums.

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 discloses a method for efficiently recycling residual alkali in tungsten ore decomposition liquid. The method comprises the following steps: step S1, evaporation and concentration; step S2, salting-out crystallization; s3, cooling, filtering and separating; the solution obtained after tungsten ore is decomposed and filtered in the step S1 is transferred into a multi-effect evaporator to be evaporated and concentrated, solid sodium hydroxide is supplemented to be dissolved to generate heat in the step S2 to be evaporated, meanwhile, sodium tungstate crystals are separated out through a salting-out crystallization method, the defect that the steam consumption of a direct evaporation crystallization method is large is overcome, and the yield of the product is improved. The direct recovery rate of sodium tungstate and sodium hydroxide is greatly improved, the production cost is saved, and the economic benefits of enterprises are increased; in the step S3, the sodium hydroxide mother liquor is returned to the tungsten ore decomposition procedure, sodium hydroxide is recycled through alkali concentration, salting-out and crystallization, the use amount of the auxiliary material solid sodium hydroxide is greatly reduced, the use amount of environment-friendly neutralization added acid is reduced, the salt content in production wastewater is reduced, and economic benefits are increased.

The invention relates to a scale inhibitor for an industrial circulating water system and an intelligent adding method thereof, and belongs to the technical field of industrial water treatment.The scale inhibitor is composed of a component A and a component B. The component A comprises, by mass, 5-15% of sodium molybdate, 5-15% of sodium tungstate, 15-25% of sodium polyacrylate, 5-15% of sodium borate, 15-25% of zinc sulfate, 5-10% of zinc chloride, 3-8% of sodium silicate and 2-6% of benzotriazole; the component B is prepared from the following components in percentage by mass: 15 to 25 percent of HEDP, 15 to 25 percent of PBTC, 35 to 50 percent of AA / AMPS copolymer and 15 to 25 percent of deionized water. According to the scale inhibitor for the industrial circulating water system and the intelligent adding method of the scale inhibitor, a phosphorus-free and chromium-free environment-friendly formula with sodium molybdate and sodium tungstate as cores is adopted, and phosphorus pollution and heavy metal risks are fundamentally eradicated; according to the formula, through cooperation of multiple components, a layer of compact and stable composite passivation film with self-repairing capacity can be formed on the metal surface in severe water with high chloride ions, and the corrosion inhibition rate gt of carbon steel is achieved; the copper corrosion inhibition rate is gt; and 98%.

This invention relates to the field of materials preparation technology, specifically disclosing a method for preparing tungsten-molybdenum alloy powder based on a coprecipitation precursor. The method involves mixing sodium tungstate, sodium molybdate, and water to prepare a tungsten-molybdenum mixed solution; mixing the tungsten-molybdenum mixed solution with a precipitant solution containing zinc or cadmium salts, and allowing the tungsten and molybdenum to coprecipitate under stirring; filtering and washing the reaction slurry to obtain a wet precipitate of tungsten-molybdate coprecipitate, with the filtrate serving as the mother liquor; drying and grinding the wet precipitate of tungsten-molybdate coprecipitate to obtain tungsten-molybdate coprecipitate powder; and reducing the tungsten-molybdate coprecipitate powder in a hydrogen stream at 700-1000°C to obtain tungsten-molybdenum alloy powder and zinc or cadmium vapor. This invention combines the reduction and alloying reactions into one, with a reaction temperature below 1000°C, shortening the tungsten-molybdenum alloy powder preparation process and significantly saving energy and reducing consumption.

The present application relates to alloy plating technical field, specifically relates to a tungsten alloy plating and its preparation method, and a hole lining pipe, the tungsten alloy plating is tungsten nickel alloy plating, plating is dense and has no defect, thickness is 40~100 μm, and Vickers hardness is not less than 900 HV1, the plating uses nickel sulfamate and sodium tungstate as main salt, is supplemented with specific composite complexing agent, conductive salt, buffer and additive, forms stable electroplating solution, is cleaned through plasma, and is combined with profiling anode and pulse electroplating technology, and is carried out electroplating under the matching pulse parameter and mechanical stirring.The method can deposit the high-hardness tungsten alloy plating of thickness uniformity, excellent performance on the inner wall, outer wall and all hole inner surface of the hole lining pipe of complex shape workpiece, in particular, solves the technical problem of uniformity of surface plating of deep hole and complex structure parts.

The present invention belongs to the technical field of tungsten metallurgy, and specifically relates to a method for reducing the water content of tungstic acid, comprising the following steps: S1, placing a container containing a sodium tungstate solution in a water bath, heating the sodium tungstate solution, stirring the sodium tungstate solution, and adding ethanol; S2, adding hydrochloric acid to the sodium tungstate solution with ethanol, adjusting the pH of the solution and monitoring the solution in real time during the reaction to ensure that the pH is stable; turning off the heating, allowing the solution to cool naturally to an aging temperature for constant temperature aging, followed by filtering and washing; and S3, drying to obtain tungstic acid. The tungstic acid obtained after filtration and washing in the present invention has a water content of ≤30wt%.

The invention discloses a preparation method of a biochar-zinc sulfide-tungsten sulfide heterojunction composite material, and the scheme comprises the following steps: S1, dissolving sodium tungstate, hydroxylamine hydrochloride, sodium hydroxide, thiourea and zinc chloride in deionized water, and uniformly stirring to obtain a light yellow transparent reaction solution; s2, biological carbon is prepared, the reaction liquid and the biological carbon are mixed in a reaction kettle and then subjected to a hydrothermal reaction for 8-48 h at the constant temperature, and the constant temperature is any one of the temperature values ranging from 180 DEG C to 240 DEG C; s3, filtering, cleaning and drying a product obtained in the step S2 to obtain a heterojunction composite material precursor; s4, the heterojunction composite material precursor is subjected to calcination treatment in the inert gas atmosphere, the biochar-zinc sulfide-tungsten sulfide heterojunction composite material is obtained, and the calcination temperature ranges from 850 DEG C to 950 DEG C.

The present invention belongs to the technical field of electrode materials and heavy metal wastewater treatment, and discloses a WS2 pseudocapacitor interface material, its preparation method and application. The preparation method comprises the following steps: uniformly dispersing sodium tungstate, thiourea, hydroxylamine hydrochloride and a surfactant in deionized water to obtain a mixed solution; heating the mixed solution to 160-200°C for hydrothermal reaction, separating, washing and drying the reaction product to obtain a WS2 pseudocapacitor interface material. The preparation method of the present invention is simple, the reaction conditions are mild and the cost is low. The obtained WS2 pseudocapacitor interface material can be used for capacitor adsorption to remove heavy metal ions, and has a great effect on Cr 3+ 、Cd 2+ , Pb 2+ 、Ni 2+ 、Co 2+ 、Cu 2+ The removal efficiency of heavy metal ions can reach over 90%. Compared with conventional methods, it has the advantages of high energy efficiency, environmental friendliness and no pollution.

The application relates to the technical field of copper foil and discloses an electrolytic copper foil and a roughening treatment method thereof. The roughening treatment method of the electrolytic copper foil comprises the following steps: S1, adding an organic-inorganic composite additive into a prepared base roughening solution to prepare a roughening solution, wherein the organic-inorganic composite additive comprises sodium molybdate, sodium tungstate and hydroxyethyl cellulose, the concentration of the sodium molybdate is 30-50 mg / L, the concentration of the sodium tungstate is 20-40 mg / L, and the concentration of the hydroxyethyl cellulose is 6-10 mg / L; and S2, performing cathode electrolytic roughening treatment on a pretreated copper foil by using the roughening solution to obtain the electrolytic copper foil. Through the above mode, the problem that a roughening layer is difficult to synchronously realize the comprehensive performance target of 'low roughness, high peeling strength and uniform compactness' can be solved.

The invention discloses a method for improving the binding force of an electrolytic copper foil and a base material under low roughness and the electrolytic copper foil. The method comprises the following steps: 1) carrying out smooth acid pickling on a 9-35 [mu] m raw foil; (2) performing picosecond laser selective ablation on bulges of more than 100nm on the surface of the pickled raw foil to enable Ra to be less than or equal to 0.1 mu m; (3) depositing a compact copper layer of 0.1-0.4 mu m to fill the micro pits; 4) coarsening in a coarsening solution containing copper ions, sulfuric acid, sodium tungstate and sodium molybdate; 5) curing in a curing liquid containing copper ions, sulfuric acid, MPS, HEC, PEG and hydrolyzed collagen; (6) heat-resisting treatment and passivating treatment are conducted in sequence; 7) spraying an organic silane coupling agent; and (8) drying at 130-140 DEG C for 5-10 seconds, and then rolling at the speed of 4-6 m / min. According to the method, the formation of a high-roughness structure is avoided through laser leveling, the compact copper layer reinforces the substrate to improve the uniformity of copper nodules, the lamination surface Rz of a final product is smaller than or equal to 1.5 microns, Ra is smaller than or equal to 0.2 microns, the peel strength is larger than or equal to 0.7 N / mm, no copper powder falls off during lamination, and the method is suitable for preparing the high-precision copper foil.

The invention belongs to the technical field of tungsten hydrometallurgy, and particularly relates to a method for removing chromium from a sodium tungstate solution, which comprises the following steps: adjusting the pH value of the chromium-containing sodium tungstate solution to 9-12, heating to 80-90 DEG C, and keeping the temperature to obtain a pretreated sodium tungstate solution; the preparation method comprises the following steps: mixing ferrite and aluminum salt in a mass ratio of (3: 1)-(4: 1), adding a proper amount of water, and stirring until the ferrite and the aluminum salt are dissolved, so as to obtain a chromium removal reagent, and the molar ratio of ferrous ions to a chromium element is (3.15: 1)-(4.50: 1); and adding a chromium removal reagent into the pretreated sodium tungstate solution, stirring, standing and filtering to obtain the chromium-removed sodium tungstate solution. The solution is prepared from the ferrous salt and the aluminum salt, so that the usage amount of a precipitator is reduced, and the chromium removal cost is reduced; al (OH) 3 generated by introducing aluminum salt is wrapped on the surface of formed Fe (OH) 3 colloidal precipitate, so that tungsten loss is reduced; according to the technical scheme, less sludge is generated, and the treatment is simple; the purity of sodium tungstate is improved, so that the quality and the performance of a tungsten product are improved; and the method is suitable for production requirements of different scales and has relatively high adaptability.

The invention discloses an O-phase sodium ion battery positive electrode material modified by a sodium tungstate-magnesium tungstate composite coating layer and a preparation method of the O-phase sodium ion battery positive electrode material. Relates to the technical field of sodium-ion battery materials. According to the preparation method, an in-situ coating strategy is adopted, the raw materials capable of reacting with the sodium compound are added, residual alkali on the surface of the material is consumed, meanwhile, a stable and uniform coating layer is formed on the surface of the material, and the prepared O-phase sodium ion battery positive electrode material has excellent electrochemical performance; a tungsten-containing compound and a magnesium-containing compound are added in the secondary sintering process, the tungsten-containing compound and the magnesium-containing compound form magnesium tungstate in the sintering process, and meanwhile, the tungsten-containing compound and a sodium source on the surface of the material form sodium tungstate; a double-coating layer formed by magnesium tungstate and sodium tungstate prevents the material from being in contact with an electrolyte, reduces side reaction and improves the cycling stability, and meanwhile, sodium tungstate is preferentially decomposed in the primary cycle of the battery and serves as a sodium supplementing agent, so that the first effect of the material is remarkably improved.

The invention relates to a method for recovering tungsten from tungsten-containing calcium sulfate slag, which comprises the following steps: S1, soda boiling: taking the tungsten-containing calcium sulfate slag, adding water for size mixing, adding sodium carbonate or sodium bicarbonate into the obtained size, and carrying out solid-liquid separation after reaction to obtain a sodium tungstate solution and residues; s2, acid dissolution: taking the residues in S1, adding water for size mixing, and adding hydrochloric acid into the obtained size to obtain a tungstic acid solution; s3, enriching, namely recycling the sodium tungstate solution obtained in the step S1 as alkali boiled mixed slurry; recycling the tungstic acid solution obtained in the step S2 as acid-soluble slurry mixing liquid; the operation of S1 and S2 is repeated until the tungsten content of the solution reaches 100 g / l, and high-concentration sodium tungstate and tungstic acid are obtained; s4, adsorption; and S5, desorbing to obtain a sodium tungstate solution. The method can realize 100% recovery of tungsten in the tungsten-containing calcium sulfate slag, and has industrial application prospects.

The invention relates to the technical field of catalysts, and discloses a catalyst for reducing the sulfur content of petroleum coke and a preparation method thereof.Sodium phytate containing multiple phosphate groups is used for replacing part of sodium phosphate salt, sodium tungstate, ammonium molybdate and lanthanum nitrate are subjected to a reaction, and obtained rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid contains more anions; the rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid and the citric acid quaternary ammonium salt containing a plurality of quaternary ammonium salt cations form stronger electrostatic interaction, and meanwhile, the citric acid quaternary ammonium salt contains a plurality of hydroxyl groups and can form hydrogen-bond interaction with the surface of the rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid, so that the surface modification of the citric acid quaternary ammonium salt on the rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid is effectively realized; after modification, the dispersity of the rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid is improved, agglomeration is reduced, more catalytic active sites are achieved, the contact area between the rare earth lanthanum phosphorus molybdenum tungsten heteropoly acid and petroleum coke is increased, and sulfur-containing compounds such as thiophenic sulfur and the like which are difficult to degrade in the petroleum coke are efficiently oxidized and removed through synergistic oxidation catalysis with hydrogen peroxide.

The invention belongs to the technical field of tungsten smelting resource utilization, and particularly relates to a method for recovering tungsten from an acidic tungsten-containing solution, which comprises the following steps: obtaining the acidic tungsten-containing solution and an alkali-containing sodium tungstate solution; the alkali-containing sodium tungstate solution and the acidic tungsten-containing solution form a mixed system, tungstic acid crystals are separated out through a reaction and continue to be crystallized and filtered, filtrate is obtained, and tungstic acid is recycled. According to the method for recovering tungsten, the problem that tungsten resources in the acidic tungsten-containing solution are difficult to efficiently recover is solved, efficient recovery of tungsten is achieved, the wastewater treatment cost can be reduced, a new technical choice is provided for related enterprises in the tungsten industry, and economic and social benefits are quite obvious.

This invention discloses a method for low-resistivity thin-film deposition, comprising the following steps: Step 1, the ceramic substrate is first pickled with 2% hydrochloric acid for 1-2 hours. After pickling, it undergoes initial treatment and activation to obtain an activated ceramic substrate; Step 2, preparation of the nickel plating solution: 7-12 g / L nickel sulfate, 15 g / L sodium tungstate, 31.5 g / L sodium hypophosphite, 35 g / L sodium citrate, 2 ml / L ammonia, and 5 g / L thiourea are stirred and mixed thoroughly to obtain the nickel plating solution. This invention enhances the contact effect between the activation solution and the substrate through the synergistic effect of the raw materials, thereby improving the performance of the product. Simultaneously, tungsten metal in the electroplating process possesses characteristics such as high temperature resistance, corrosion resistance, low temperature coefficient of resistance (TCR), and good thermal stability. Furthermore, the synergistic effect of the raw materials significantly improves the product's performance.

The present invention provides a high modulation ratio tungsten trioxide electrochromic thin film and a preparation method thereof. The preparation method includes weighing Na2WO4·2H2O and dissolving it into a sodium tungstate solution; adding strong acid dropwise to the sodium tungstate solution for a metathesis reaction to obtain a tungstic acid solution, and then decomposing the tungstic acid solution by oil bath heating to obtain flaky WO3; drying the flaky WO3 to obtain WO3 nano powder; adding the WO3 nano powder and ITO nano powder to a film-forming agent according to a preset ratio, and after ultrasonic cleaning machine oscillation dispersion and ball milling, forming an ITO / WO3 dispersion; spin-coating the ITO / WO3 dispersion on ITO conductive glass on a spin coater and calcining to obtain an electrochromic thin film. The electrochromic thin film prepared by the present invention has a light modulation amplitude of up to 91% in the visible light band and a significantly improved coloring efficiency, and this method has a high yield and is suitable for large-scale preparation.

This invention relates to an antibacterial medical care pad and its manufacturing process. From top to bottom, it comprises a soft layer, an antibacterial layer, an absorbent layer, and a breathable layer. The antibacterial layer, by weight, comprises the following components: 100 parts polypropylene, 3-8 parts antibacterial powder, and 2-5 parts nanoparticles. The absorbent layer, by weight, comprises the following components: 100 parts acrylic resin, 10-15 parts viscose fiber, 15-20 parts long-staple cotton, and 3-8 parts antibacterial agent. The nanoparticles comprise modified nano-silica and an antibacterial core shell, with a mass ratio of 1:(2-5). The antibacterial core shell comprises the following components: cerium nitrate, lanthanum nitrate, sodium tungstate, and carboxymethyl chitosan. This invention improves the antibacterial performance of the pad by placing an antibacterial layer between the soft layer and the absorbent layer. The addition of an antibacterial agent to the absorbent layer enhances its antibacterial performance, thereby reducing the overall antibacterial performance of the pad. Furthermore, the breathable layer facilitates the timely removal of moisture, reducing patient discomfort.

A rare earth-based electrolytic coloring method, electrolyte, and alloy product are provided, where the method includes: after an oxide film is formed on a workpiece subjected to anodic oxidation in the electrolyte, rapidly increasing a voltage, and by using a constant-voltage mode, breaking down, melting, sintering, and reforming the oxide film cyclically multiple times under conditions of high frequency, a high voltage, and instantaneous high temperature, to generate a ceramic film layer metallurgically bonded to a substrate. The oxide film has a greater thickness and lower reflectance, and an appearance as a matte black anode, and has good color consistency and no chromatic aberration. Components of the electrolyte include sodium silicate at a concentration of 5-70 g / L, sodium tungstate at a concentration of 1-18 g / L, disodium ethylenediamine tetraacetic acid at a concentration of 2-10 g / L, and rare earth salts at concentrations of 1-2 g / L.

The utility model discloses a weathering drying device for a sodium tungstate solution, which belongs to the technical field of sodium tungstate drying and comprises a drying cylinder, a drying bin and a feeding pipeline, the feeding pipeline is mounted on the side wall of the drying cylinder, the drying bin for forming the sodium tungstate solution is formed in the drying cylinder, and the lower end of the drying cylinder is connected with a protective cover. A base pipe inserted into the drying bin is arranged at the upper end of the protective cover, a plurality of sliding grooves are formed in the side wall of the base pipe, and a push rod is arranged at each sliding groove. A feeding pipeline and a hot air pipeline are arranged on the side wall of the drying cylinder, a hot air nozzle connected with the hot air pipeline is obliquely aligned with blades to blow air, the movable cover and the base form a solution bin for storing a sodium tungstate solution, and hot air blowing can drive the blades to rotate to achieve stirring and drying of the sodium tungstate solution in the solution bin. The electric push rod can drive the connecting rod, the push rod and the movable cover to move up and down, the height of the solution bin is changed, dry sodium tungstate in the solution bin is discharged, hot air blows blades to throw out sodium tungstate, and the discharging efficiency is improved.

The present invention provides a uranium-containing tellurium tungstate, a preparation method and an application thereof, belonging to the technical field of new polyacid chemistry materials. The chemical formula of the present invention is [H2N(CH3)2] 14 Na4[(UO2)2(H2O)2(Te3W 21 O 75 H)2]·18H2O, belonging to the monoclinic system, space group P21 / n, and the unit cell parameters are: #imgabs0# α = γ = 90°, β = 89.899°, #imgabs1# Z = 4. After stirring sodium tungstate, sodium perchlorate and sodium tellurite in an aqueous solution, dimethylamine hydrochloride is added and the pH is adjusted, and then uranyl nitrate is added for a water bath reaction followed by post-treatment to obtain the uranium-containing tellurium tungstate. The uranium-containing tellurium tungstate of the present invention has a clear structure and good stability, and has photochromism. Its preparation process is simple and easy to operate.

This invention provides a method and application for separating and recovering tungsten from spent denitrification catalysts, relating to the field of resource utilization technology for spent denitrification catalysts. The method includes the following steps: (1) mixing spent denitrification catalyst, silica, and alkali metal salts to form a mixture; (2) smelting the mixture, with the smelting temperature procedure as follows: first heating to 800-900℃ and holding for 30-60 min; then heating to 1100-1200℃ and holding for 40-90 min; then heating to 1300-1400℃ and holding for 30-60 min to obtain a melt; (3) cooling the melt, collecting and recovering sodium tungstate. This invention, through a segmented temperature-controlled smelting process and utilizing an alkali metal silicate glass melt medium, achieves the harmless treatment of spent denitrification catalysts and the efficient recovery of tungsten, effectively improving the tungsten recovery rate, and has good development prospects and industrial application value.

The present invention belongs to the technical field of tungsten metallurgy, and specifically relates to a flaky nano-tungstic acid, a preparation method thereof and an application. The preparation method includes: S1. Add hydrochloric acid into a container, continuously stir during the adding process and keep the temperature in the container stable; S2. Spray 8 - 10 mL of sodium tungstate solution B into the container, continuously stir during the adding process and keep the temperature in the container stable; S3. Spray 0.5 - 1.0 L of sodium tungstate solution A into the container, continuously stir during the adding process and keep the temperature in the container stable; the amount of hydrochloric acid added in step S1 is 2.5 - 4.0 times the theoretical amount of hydrochloric acid required for preparing tungstic acid according to the concentration of tungstate in sodium tungstate solution A; S4. Repeat steps S1 and S3; S5. Filter the prepared tungstic acid, wash it with hydrochloric acid and then dry it, and flaky nano-tungstic acid with complete crystal development can be stably prepared, and its thickness is less than 100 nm.

This invention provides a high-efficiency seedless grape cultivation technology. Through systematic innovation in seed pretreatment, compound growth regulator formulation, substrate optimization, and precise cultivation management, it overcomes traditional technological bottlenecks. Seed pretreatment employs a quicklime-distilled water activation method combined with wood ash-milk fermentation and ultrasonic-assisted treatment, significantly improving embryo activity and germination rate. The growth regulator is a golden ratio compound of gibberellin and chlorpyrifos, applied to the flower spikes twice, with sodium tungstate added to prolong efficacy, achieving a seedless rate >95% and a 20%-30% increase in berry weight. The substrate uses a multi-stage formulation system, adjusted to pH 5.0-5.5 after low-temperature sterilization, and incorporates 5% biochar to enhance water retention and pollution resistance. Innovative cultivation management includes optimized H-shaped trellis system combined with rain-sheltered cultivation and precise water and fertilizer management, resulting in a stable yield of over 1500 kg / mu, extended shelf life to 15 days, and a cultivation cycle shortened to 2 years before fruiting. This technology comprehensively improves fruit quality and planting efficiency, demonstrating significant application value.

The present application relates to a kind of indium-poor tungsten bronze phase mosaic block assembled composite material and its preparation method, and the indium-poor tungsten bronze phase mosaic block assembled composite material is by In 0.02 WO3 is formed by WO3 compound, there are many tunnels consisting of the interval between tungsten and oxygen atom in the indium-poor tungsten bronze phase mosaic block assembled composite material, and indium ions are randomly distributed on both sides of the tunnel center position.Method: step one, create supersaturated sodium sulfate solution environment;Step two, in the supersaturated sodium sulfate solution environment obtained in step one, add indium nitrate, add NH4Cl hydrothermal reaction;Step three, centrifugation;Step four, sodium tungstate, oxalic acid and ammonium chloride are sequentially added to deionized water, drop into HCL, add the product of step three hydrothermal reaction, centrifugation and washing, finally the indium-poor tungsten bronze phase mosaic block assembled composite material is prepared.The material has high sensitivity to acetone gas, and the working temperature is low.

The invention discloses a high-wear-resistance Co-W composite coating electrolyte based on bifunctional particles as well as a preparation method and an electro-deposition method thereof, and relates to the technical field of material surface engineering. The electrolyte takes water as a solvent, and the mass percent of solutes in an electrolyte system is as follows: 3.59 to 8.07 percent of cobalt sulfate, 6.4 to 14.4 percent of sodium tungstate, 7.69 to 17.3 percent of a complexing agent, 1.92 to 4.32 percent of sodium chloride, 2.56 to 5.76 percent of a buffering agent, 2.56 to 5.76 percent of silicon carbide, 0.07 to 0.15 percent of carbon powder and 0.01 to 0.03 percent of a surfactant. And based on the electrolyte, the high-wear-resistance Co-W composite coating is prepared by adopting an electro-deposition method. By means of the supporting effect of the Co-W alloy matrix and the synergistic interaction of the silicon carbide and carbon powder dual-function particles, the comprehensive performance of the coating is remarkably improved, the whole process is convenient, fast and efficient, and the surface protection requirements of all industrial parts are met.

The invention provides a method for determining the content of precious metal elements in an automobile purification catalyst, and belongs to the technical field of analysis and detection. According to the method, a composite melting system composed of sodium peroxide, anhydrous sodium metaborate and sodium tungstate is constructed, an automobile purification catalyst sample is subjected to efficient melting decomposition, complete leaching of a melt is achieved in combination with a hydrochloric acid and tartaric acid composite acidification system, a tin-tellurium coprecipitation enrichment technology is introduced on the basis, and the purity of the automobile purification catalyst sample is improved. Trace precious metal elements such as platinum, palladium and rhodium are selectively precipitated and effectively enriched, and matrix interference is remarkably reduced; and then adding an indium internal standard solution and carrying out quantitative determination by adopting inductively coupled plasma emission spectrometry, thereby realizing high-sensitivity and high-accuracy analysis of the noble metal element. The method effectively solves the problems of incomplete sample decomposition, low precious metal recovery rate, serious matrix interference, poor detection result stability and the like in the prior art.