10 results about "Sodium tungstate" patented technology

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 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.

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 application belongs to the field of tungsten smelting, and particularly relates to a method for removing silicon from a crude sodium tungstate solution, comprising the following steps: S1, obtaining a crude sodium tungstate solution, adding sodium fluoride and sodium chloride into the crude sodium tungstate solution to obtain a first mixture; S2, adding an inorganic acid into the first mixture for stirring reaction to obtain a second mixture; and S3, performing solid-liquid separation on the second mixture to obtain a purified solution and a sodium hexafluorosilicate solid residue. The application proposes a sodium hexafluorosilicate precipitation method for purification process, which can effectively reduce the silicon content in the crude sodium tungstate solution to a qualified standard, has a good impurity removal effect, and simultaneously reduces the tungsten precipitation loss in the purification residue after solid-liquid separation.

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.

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.

This invention discloses a method for preparing a WO3 photoanode rich in (002) crystal planes. The method employs a hydrothermal process, using sodium tungstate as the tungsten source. Hydrochloric acid is added to precipitate the sodium tungstate aqueous solution, followed by the addition of oxalic acid and hydrochloric acid to form a hydrothermal precursor. A WO3 seed layer is added to the hydrothermal precursor for a hydrothermal reaction, followed by annealing to obtain a WO3 photoanode film rich in (002) crystal planes. This method is simple, and the prepared WO3 rich in (002) crystal planes exhibits higher photocurrent density, more active sites for water oxidation, and superior hydroxyl radical generation compared to WO3 rich in (200) crystal planes. It also demonstrates good stability and highly efficient tetracycline degradation capabilities.

This invention provides a simple and efficient method for recycling tungsten carbide waste containing cobalt and other doped metals (more than 8%). The specific steps include: oxidizing the tungsten carbide (containing cobalt) waste at high temperature into oxides and tungstates; subjecting it to high-temperature alkaline leaching to form cobalt and other metal elements as a slag phase; and dissolving tungsten in sodium tungstate solution, thus achieving solid-liquid separation. The sodium tungstate solution is then converted into ammonium tungstate solution through an extraction process, followed by evaporation and crystallization to form ammonium paratungstate. The method provided by this invention is simple to operate, uses inexpensive and readily available raw materials, and has low processing difficulty. Furthermore, tungsten, cobalt, and other valuable metals can be almost completely separated and recovered, with recovery rates exceeding 98%, resulting in extremely high economic benefits.

This application belongs to the field of tungsten hydrometallurgical technology, specifically a method for deep phosphorus removal from crude sodium tungstate solution, comprising the following steps: activating activated carbon in a dilute nitric acid solution; adding the activated activated carbon to a crude sodium tungstate solution containing flotation agent and phosphorus, performing a first stirring, then adding calcium salt, performing a second stirring and heating, followed by solid-liquid separation to obtain a phosphorus-removed sodium tungstate solution. The oxygen-containing functional groups reconstructed on the surface of the activated carbon in this application can induce interfacial mineralization of hydroxyapatite, overcoming the phosphorus removal bottleneck that traditional calcium salt precipitation methods cannot overcome. By pre-adsorbing and removing the flotation agent with activated carbon, the encapsulation of precipitated particles by organic colloids is avoided, resulting in faster settling speed and better filtration performance of the phosphorus-removed slag, greatly improving production operating conditions, and significantly reducing the consumption of subsequent phosphorus removal agents, further reducing the purification cost of tungsten smelting, and is easy to implement and promote in existing tungsten smelting production lines.

This invention provides a method for manufacturing corrosion-resistant and high-temperature-resistant welded titanium and titanium alloy components, relating to the field of titanium and titanium alloy material processing technology. The method includes: sequentially performing ultrasonic cleaning, chemical degreasing, pickling, and activation for surface pretreatment; followed by pre-plating with nickel, deposition of a composite gold plating layer of nano-ceramic powder modified with a silane coupling agent, and then achieving metallurgical bonding between the plating layer and the substrate through an argon-hydrogen mixed atmosphere interface stabilization heat treatment; selective masking using a photolithography mask and UV-cured resist; and in-situ anodizing using a composite electrolyte containing sulfuric acid, phosphoric acid, sodium molybdate, and sodium tungstate via a step-boost method. This invention effectively solves the problems of poor plating adhesion, easy softening failure at high temperatures, insufficient corrosion resistance, and poor welding performance in traditional titanium alloy welded components through the synergistic effect of multiple processes including surface pretreatment, pre-plating with nickel, composite gold plating, interface stabilization heat treatment, and partitioned in-situ anodizing.