170 results about "Sodium tungstate" patented technology

Performance is improved. There is provided a negative electrode material for a battery, in which the negative electrode material includes carbon, sodium tungstate, and silicon particles 33 including silicon, and in the silicon particle 33, a ratio of the amount of Si in Si2p derived from elemental silicon to the amount of Si in Si2p derived from SiO2 in a surface layer when measured by X-ray photoelectron spectroscopy is 3 or more on an atomic concentration basis.

The invention belongs to the technical field of copper foils, and particularly relates to a production process of a copper foil and the copper foils, and the production process of the copper foils comprises the following steps: reacting a copper raw material with sulfuric acid to generate a copper sulfate solution; the copper sulfate solution is electrolyzed, and crude foil is obtained; the raw foil is subjected to surface treatment, the surface treatment comprises a roughening process, in the roughening process, a roughening solution comprises an additive C and an additive D, the additive C comprises one or a mixed solution of two or more of sodium tungstate, sodium molybdate, ammonium molybdate, tin sulfate and titanium sulfate, and the concentration of the additive C is 10-60 ppm; the additive D comprises high-molecular organic matters such as hydroxyethyl cellulose and ethylene glycol, and the concentration of the additive D is 30-50 ppm; and carrying out target temperature treatment on the crude foil subjected to the surface treatment to obtain the copper foil. Through the copper foil production process in the scheme, the peeling strength attenuation rate of the copper foil after high-temperature treatment can be reduced.

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 belongs to the technical field of tungsten metallurgy, and particularly relates to a method for reducing the water content of tungstic acid, which comprises the following steps: S1, heating a container filled with a sodium tungstate solution in a water bath kettle, stirring the sodium tungstate solution, and adding ethanol; s2, adding hydrochloric acid into the sodium tungstate solution added with the ethanol, adjusting the pH value of the solution, monitoring in real time in the reaction process to ensure that the pH value of the solution is stable, stopping heating to naturally cool the solution to an aging temperature for constant-temperature aging, and then filtering and washing; and S3, drying to obtain tungstic acid. The water content of the tungstic acid obtained after filtering and washing is less than or equal to 30wt%.

The invention belongs to the technical field of waste recovery, and discloses a method for comprehensively recovering tungsten and phosphorus from scheelite smelting slag and tungsten-containing waste, which comprises the following steps: mixing the tungsten-containing waste, the scheelite smelting slag containing calcium phosphate and sodium salt, roasting to obtain a roasted material, leaching the roasted material with water to obtain a sodium phosphate solution and water leaching slag, and the water leaching residues are subjected to alkaline leaching, and then a sodium tungstate solution and alkaline leaching residues are obtained. The invention further comprises application of the sodium phosphate solution to scheelite decomposition. According to the method, phosphorus in the scheelite smelting slag and tungsten in the tungsten-containing waste can be efficiently recycled while the low cost, the minimum environmental pollution and the operation convenience are kept, and therefore cyclic utilization and sustainable development of resources are powerfully promoted.

The invention discloses a method for recovering valuable metals tungsten and tin from hazardous waste tungsten slag, and aims to solve the problems that the existing method for recovering the valuable metals from the tungsten slag needs higher temperature and the recovery rate of the valuable metals tungsten and tin needs to be improved. The recovery method comprises the following steps: S1, uniformly stirring and mixing tungsten slag powder with a reducing agent and a vulcanizing agent A; s2, the slag agent mixture in the S1 is placed in a tubular furnace to be subjected to high-temperature reduction treatment; s3, carrying out sulfuric acid leaching treatment on the furnace slag; s4, the acid leaching residues serve as a vulcanizing agent B, and high-temperature reduction treatment and sulfuric acid leaching treatment are repeated for multiple times; and S5, stirring the tungsten-enriched sulfide slag and sodium hydroxide, roasting, performing water leaching on a product to obtain a sodium tungstate solution, and finally performing evaporative crystallization. The valuable metal tin in the hazardous waste tungsten slag is extracted through high-temperature vulcanization reduction. Tin is recovered through sulfuration reduction reaction, sulfide generated by lead and arsenic oxides is separated from scheelite slag and enters smoke dust, iron and manganese oxides are subjected to sulfuration reduction reaction and enter a slag system, and harmless treatment of hazardous wastes is achieved.

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 relates to the technical field of recovery of valuable metals in causticized slag, in particular to a method for recovering tungsten in causticized slag, which utilizes the characteristics that tungsten contained in the causticized slag mainly exists in the form of sodium tungstate and Na2WO4 can be dissolved in water, comprises the following steps: firstly, leaching tungsten in the causticized slag by adopting a water leaching method without additionally adding acid and alkali, and then leaching tungsten in the causticized slag by adopting a water leaching method, according to the method, tungsten ions in water leaching liquid are recycled through an ion exchange method, separation of the tungsten ions and other soluble impurity elements is achieved through the characteristic that alkalescent anion resin adsorbs metatungstate in an acid environment, the method combining the water leaching process and the ion exchange process is adopted, valuable metal can be highly leached and recycled, and the method is suitable for industrial production. The metal recovery rate is high, loss of valuable metal in the slag is reduced, waste of tungsten resources is avoided, the process is simple, operability is high, the production cost is low, environment friendliness is achieved, and the tungsten recovery cost is greatly reduced.

The invention belongs to the technical field of chemical mineral detection, and particularly relates to a full-spectrum titration detection method for total iron content in ore. According to the method, after ore sample decomposition is completed, a stannous chloride solution, a sodium tungstate solution, a titanium trichloride solution, a dilute potassium dichromate solution, sulfur-phosphorus mixed acid, a sodium diphenylaminesulfonate solution indicator and a potassium dichromate standard solution are sequentially added into sample liquid, and the whole titration process is measured through a visible light full-spectrum titrator. And presetting a titration condition change point to mark the change of the titration condition, and calculating the total iron content in the ore by taking the volume value corresponding to the full-spectrum titration color change parameter of the titration of the potassium dichromate standard solution as the volume value of the titration end point.

The invention discloses a dressing and smelting combined treatment method for weathered tungsten ore, and belongs to the technical field of mineral processing. The method comprises the following steps: carrying out rotational flow classification on weathered or semi-weathered tungsten ore to obtain fine-fraction tungsten ore and superfine-fraction tungsten fine silt; the fine-fraction tungsten minerals are subjected to flotation through a reagent system containing a metal-based colloid collecting agent, high-grade tungsten concentrate is obtained, and the high-grade tungsten concentrate enters a wet smelting process; the method comprises the following steps: selectively flocculating and settling superfine tungsten fine silt through a functional modified polyacrylamide flocculating agent to obtain low-grade tungsten concentrate, and carrying out a sodium salt roasting-water leaching process on the low-grade tungsten concentrate to obtain a sodium tungstate solution. According to the method, the tungsten element in the weathered or semi-weathered tungsten ore can be deeply enriched and recycled, clean and efficient utilization and sustainable development of tungsten ore resources are promoted, and remarkable economic benefits are achieved.

The invention belongs to the technical field of electrochromic films, and discloses a method for preparing a high-visible-light-transmittance tungsten oxide electrochromic film at low temperature based on a chemical bath method.The method comprises the steps that sodium tungstate is dissolved in water to obtain a sodium tungstate solution, the sodium tungstate solution and an oxalic acid solution are added into deionized water, stirring is conducted, and then the high-visible-light-transmittance tungsten oxide electrochromic film is obtained; adding hydrochloric acid to obtain a mixed solution, immersing FTO conductive glass into the mixed solution, and carrying out ultrasonic oscillation; and heating the reaction system at 60 DEG C for reaction, and washing, drying and annealing the FTO conductive glass on which the yellow film grows to obtain the tungsten oxide electrochromic layer. According to the method, the reaction conditions are mild, growth of the precursor film is completed through low temperature and raw material matching cooperation, and the tungsten oxide electrochromic film with high light transmittance and excellent electrochromic performance is finally prepared.

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%.

The application belongs to the technical field of physical detection, and particularly relates to a display method of prior austenite grain boundaries of bainite steel, which comprises preparing a metallographic sample, preparing a corrosion solution and electrolytic corrosion. The corrosion solution comprises the following components with mass concentrations: 5-20 g / L of picric acid, 3-10 g / L of sodium tungstate and 0.009-0.03 g / L of zinc chloride. An electrolytic etching device used in the electrolytic corrosion comprises a resistance heating furnace, an iron stand, a metal rod with a tapered head, a glass beaker and a metal base. The resistance heating furnace is arranged on the iron stand, and the metal rod with the tapered head and the metal base are arranged in the glass beaker. The metal rod with the tapered head is used to connect a cathode of an electrolytic device, and the metal base is used to connect an anode of the electrolytic device. Through the corrosion solution with a special proportion and the electrolytic etching device, the corrosion rate can be effectively controlled, the prior austenite grain boundaries can be clearly displayed, and the grain size of the prior austenite grain boundaries in the bainite steel can be accurately obtained.

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 discloses an automatic detection system for a metallurgical sample material, and belongs to the technical field of metallurgical sample material detection, the automatic detection system comprises a sampling adapter tube and a classification detection cylinder, the two ends of the sampling adapter tube are assembled and connected with liquid conveying pipelines for conveying a metallurgical leaching solution; the inner side wall of the front end of the sampling adapter pipe is connected with an impeller piece for enabling flowing liquid to generate centrifugal force through a retention assembly. Through the arrangement of the sampling assembly and the sampling barrel, a sampling groove in the sampling barrel can be opened by utilizing impact water pressure borne by a flow blocking plate in the forward direction, solutions at the edge of the inner side and the axis of a sampling adapter pipe are sampled respectively, and subsequent detection and analysis on sampling materials at different parts are facilitated; meanwhile, due to the arrangement of a classification detection cylinder and a plurality of partition plates, the detection of two groups of sampled sodium tungstate solutions can be quickly completed, so that a control group is provided for sampling detection, and the sampling detection result of the leached sodium tungstate solutions is more comprehensive and accurate.

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.