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99.5% yellow tungsten oxide is a yellow powder with high purity. The determination process of Si in the yellow tungsten oxide is available by silicon molybdenum blue spectrophotometry method, which is easy to operate by dissolving yellow tungsten oxide with NaOH solution and complexing tungsten with citric acid. The measurement range of ωSi is from 0.0004% to 0.016%, the recovery rate is at the range of 95.71%~118%, and the relative standard deviation is less than 14.32%. Silicon Molybdenum Blue Spectrophotometry…

99.95% yellow tungsten oxide may be applied to produce fireproof fabric. Fireproof fabric is designed to resist burning and withstand heat. And it can not only effectively prevent the spread of flame, but also can protect the original performance of the fabric products. Therefore, it is usually used in special industries for special types of protective fabrics. Studies have found a flame retardant and heat resistant nano magnesium oxide doped polyvinyl dc cable materials, by adding nano tungsten trioxide to…

99.9% yellow tungsten oxide, or 3N yellow tungsten oxide, is a kind of yellow powder with relative high purity. Spray Pyrolysis Method to Produce Nano Yellow Tungsten Oxide By dissolving tungstic acid (H2WO4) in alkali solution containing ammonia under a certain ratio, by ultrasound spray conversion and vacuum drying to get nano YTO powder. Actually, this method is an aerosol process which belongs to vapor phase method. But it uses liquid phase as precursor. Therefore, it has the advantages of…

99.99% yellow tungsten oxide may be produced by microemulsion method. This method adopts ammonium tungstate solution as raw material. The processes are shown as follows: 1. Add the ammonium tungstate solution into emulsion with surfactant. 2. After super-emulsifying, add in strong acid such as hydrochloric acid (HCL) and sulfate (H2SO4) to react and precipitate. 3. After centrifugal precipitants, clean the precipitants with solvent. 4. Dry to get yellow tungsten oxide. In microemulsion method, surfactant and co-surfactant is composed of a…

Large grain size yellow tungsten oxide is tungsten trioxide with large grain size. Large grain size tungsten trioxide’s detection is mainly detecting its impurity content, apparent density and particle size. Apparent density is available by using apparent density meter. The particle size is measured with particle size analyzer. Detecting Impurity Content of Yellow Tungsten Oxide Dissolve yellow tungsten oxide in ammonia, and dilute the obtained solution with deionized water, then mix. Detect blank solution, yellow tungsten oxide ammonia solution and…

High density yellow tungsten oxide may be used where higher density is required. In the production process, yellow tungsten oxide should be tested up to standard by relevant testing equipment including X-ray diffractometer, apparent density meter and particle size analyzer. X-ray diffractometer is used to detect the valence of tungsten, then to determine the phase composition. Apparent density meter is used for measuring apparent density and particle size analyzer for particle size measurement. X ray diffractometer includes the following main…

High-purity ultrafine yellow tungsten oxide, or high-purity ultrafine tungsten trioxide is a yellow or light green powder with purity higher than 99.99% and apparent density of 0.28~0.3g/cm3. High-purity ultrafine tungsten trioxide has good catalytic property to be used as a catalyst for petrochemicals. Also, it has good photochromic property and gas sensitivity. Vapor Phase Method to Produce Yellow Tungsten Oxide Generally in the air atmosphere, pressure of the evaporation system is controlled under 133.3~1199.9P, and the tungsten wire is heated…

High-purity high density yellow tungsten oxide is a yellow powder with excellent pressing property to prepare tungsten trioxide target with high purity and super high density. The production of high-purity high density tungsten trioxide target should be studied from the aspects of powder, forming and sintering. The optimized combination of the three aspects is necessary to prepare tungsten trioxide target with high purity and high density. The specific research contents include: 1. To produce tungsten trioxide powder with high purity,…

Medium yellow tungsten oxide or medium tungsten trioxide may be prepared by tungstic acid calcination method, in which tungstic acid is dried and calcined. The tungstic acid calcination method is commonly applied in the industry for producing tungsten trioxide. Tungstic Acid Calcination Method to Produce Yellow Tungsten Oxide It is recorded that tungstic acid is dried under 100℃, mainly by removing moisture absorbed in the product. Ammonia and combined water need to be calcinated under high temperature. Tungstic acid is…

Coarse yellow tungsten oxide or coarse tungsten trioxide may be prepared by the ammonium paratungstate – sodium complex salt method. And the coarser the particle size of prepared tungsten trioxide is, the greater the corresponding apparent density is. The Laws of Coarse Tungsten Trioxide Produced by Complex Salt Method 1. The apparent density is greater if the particle size of tungsten trioxide prepared by maintaining the original grain structure of “ammonium paratungstate – sodium complex salt” is coarser. This is…