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Tungsten oxide overview
Tungsten trioxide is a powder metallurgy raw material for the production of cemented carbide and tungsten products. According to the national standard (GB/T 3457-1998), it is divided into two types, namely tungsten trioxide (referred to as yellow tungsten), molecular formula is WO3, and blue tungsten oxide (referred to as blue tungsten, is a mixed tungsten oxide), molecular formula W20O58. Yellow tungsten is light yellow crystalline powder, blue tungsten is dark blue or blue-black crystalline powder.
Preparation method of tungsten oxide
1. Ammonium tungstate method: The tungsten concentrate is hydrolyzed by sodium hydroxide, neutralized with hydrochloric acid, and then reacted with ammonium chloride to generate ammonium tungstate, which is then added with hydrochloric acid for acid hydrolysis to generate tungstic acid, which is then decomposed by roasting. , pulverized to obtain tungsten trioxide.
2. Hydrochloric acid decomposition method of tungstate. The saturated aqueous solution of sodium tungstate Na2WO4, calcium tungstate CaWO4 and other tungstate salts is heated, and the solution is slowly added dropwise into 2-3 times excess boiling concentrated hydrochloric acid by molar ratio. According to the above reaction, yellow tungstic acid is precipitated. At this time, if the dripping speed is too fast or the liquid temperature drops, suspension or colloidal precipitation is likely to be formed, which brings difficulties to the next treatment. After the dropwise addition, heating was continued on a water bath for 1 h, and the precipitate became easy to filter. After standing, it was washed several times with 5% ammonium nitrate aqueous solution to completely remove Cl-. After filtration, it is dried at 120 °C, and finally heated to 600 °C, the tungstic acid is completely dehydrated and becomes tungsten trioxide.
3. Thermal decomposition of ammonium paratungstate. Put ammonium paratungstate (NH4) 10W12O41·11H2O purified by recrystallization method into a porcelain crucible, and when heated to above about 400 ℃, ammonia volatilizes to obtain tungsten trioxide.
Application of tungsten oxide WO3 powder
Tungsten oxide has a variety of uses in daily life. It is commonly used in the manufacture of phosphors for industrial X-ray screens and tungstates for fire-resistant fabrics. Due to its rich yellow element, tungsten oxide is also used as a pigment in ceramics and paints. In addition, other application examples of tungsten trioxide are as follows:
Tungsten oxide is mainly used in the production of tungsten powder and tungsten carbide powder by calcination reduction, and is further used in the production of cemented carbide products, such as the manufacture of tools and molds.
Tungsten oxide can also be used to manufacture pure tungsten products, tungsten rods, tungsten wires, tungsten electrodes; and use counterweights and radiation shielding materials.
In industrial production, a small amount is also used as a colorant for yellow ceramics. In the shipbuilding industry, tungsten oxide is used as an important anti-corrosion paint and coating material.
Tungsten oxide has been used to produce electrochromic windows, smart windows. These windows are electrically switchable glass that varies in light transmittance and applied voltage. This allows users to tint their windows by changing the heat or light.
Tungsten oxide WO3 powder price
The price of tungsten trioxide powder will change randomly with the production cost of tungsten trioxide powder, transportation cost, international situation, exchange rate, market supply and demand and other factors. Tanki New Materials Co.,Ltd aims to help various industries and chemical wholesalers find high-quality, inexpensive nanomaterials and chemicals by providing turnkey custom manufacturing services. If you are looking for tungsten oxide WO3 powder, please feel free to send an inquiry to get the latest price of tungsten oxide WO3 powder.
Tungsten Oxide WO3 Powder Supplier
As a global tungsten oxide WO3 powder supplier, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced and engineered materials. The company has successfully developed a series of powder materials (including oxides, carbides, nitrides, single metals, etc.), high-purity targets, functional ceramics, structural devices, and can provide OEM services.
More information about Tungsten Oxide WO3 Powder
Tungsten Trioxide Properties (Theoretical)
1473 °C (2683 °F)
1700 °C ( 3092 °F)
Solubility in H2O
Crystal Phase / Structure
After Ukraine confirmed that it had received transit transportation fees paid by Hungary and Slovakia, Russia resumed the delivery of oil from the southern route of the "Friendship" pipeline to Hungary and Slovakia on August 10.
The Hungarian oil and gas company said that after negotiations with Ukraine and Russia on resuming the southern route of the "Friendship" pipeline, the company paid transit fees for the Ukrainian section of the pipeline, and the southern line of the "Friendship" pipeline has been restarted.
Rosneft issued a notice saying that since August 4, Ukraine has banned Russian oil from the southern route of the "Friendship" pipeline in Ukraine to Hungary, Slovakia and the Czech Republic. Due to financial sanctions imposed by the European Union, the company was unable to pay transit fees to Ukraine, which had been refunded. The Ukrainian Oil Transport Company decided to stop providing oil transport services on the grounds that it had not received transit fees.
The Friendship pipeline starts in Samara state in southwestern Russia, with the northern route to Germany and Poland via Belarus and the southern route to the Czech Republic, Slovakia and Hungary via Ukraine.
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