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Grade 2 yellow tungsten oxide, also called grade 2 tungsten trioxide, is a type of yellow tungsten oxide classified in accordance with Chinese standard. Its grade is WO3-2. It is inferior to super grade yellow tungsten oxide and grade 1 yellow tungsten oxide. It can be prepared by using sodium tungstate. Sodium tungstate is an important intermediate material during the process of producing tungsten metal from tungsten concentrate. It is mainly used to prepare ammonium paratungstate and then further processing…

Grade 1 yellow tungsten oxide, also known as grade 1 tungsten trioxide, with grade of WO3-1. Whether it is grade 1 or grade 2 yellow tungsten oxide powder, even super grade yellow tungsten oxide powder, they are all from the tungsten ore. But, how to measure the content of tungsten trioxide in tungsten ore? Thiocyanate photometric method is one of various methods to measure the content of WO3 in tungsten mine. Its strengthening processes show as bellows: Step one: Dissolve…

Super grade yellow tungsten oxide, also known as super grade tungsten trioxide, is a grade of yellow tungsten oxide with highest purity under Chinese standard. Its grade is WO3-0. The complex salt method can be used to produce yellow tungsten oxide with different particle size. Super grade WO3 can generally be prepared by calcining pure tungstate or ammonium paratungstate (APT). So, the particle size of tungstic acid or APT will directly affect the particle size of WO3. It should be…

Industrial grade yellow tungsten oxide is a yellow powder with purity higher than 99.95% and an average particle size of less than 100nm, which can be prepared by ammonium paratungstate calcination method. The purity of yellow tungsten oxide depends on the purity of ammonium paratungstate (APT). The crystal form of yellow tungsten oxide inherits the crystal form of APT. Therefore, by controlling the crystal form and purity of APT, yellow tungsten oxide with desired crystal form and purity can be…

Ultrafine yellow tungsten oxide is a yellow powder with a large specific surface area, which can be prepared by hydrothermal method. There are three obvious characteristics of hydrothermal method: 1. Accelerate hydrolysis reaction. 2. Accelerate reaction between complex ions. 3. The oxidation-reduction potential of the reactants changed obviously. Hydrothermal Method to Produce Yellow Tungsten Oxide Step one: Weigh a certain ratio of sodium tungstate dehydrate (Na2WO4?2H2O) and sodium chloride into distilled water. The concentration of sodium tungstate in distilled water…

Optical grade yellow tungsten oxide can be produced by sol-gel method. Sol-gel method adopts ammonium paratungstate (APT) as precursor, adding in ethyl and esters in a certain ratio. After reaction, tungstic acid sol is obtained. After a period of aging process, tungstic acid sol is converted into tungstic acid gel, and then by drying, calcinating tungstic acid to obtain yellow tungsten oxide powder (YTO). Sol-gel method, SG method for short, is a kind of mild producing method of materials. Yellow…