The production of tungsten oxide can use the alkali fusion method. The following are the general steps for producing tungsten oxide by alkali fusion method:
Prepare raw materials: crush and grind tungsten concentrate or other tungsten-containing raw materials to obtain tungsten powder with appropriate particle size.
Melting: Mix tungsten powder with an alkaline substance such as sodium carbonate (Na2CO3) or sodium bicarbonate (NaHCO3). The mixture is usually melted in a high temperature furnace, typically between 800°C and 900°C.
Alkali fusion reaction: At high temperature, the alkaline substance reacts with tungsten powder to form tungstate (such as tungstate carbonate), which is dissolved in the molten alkaline substance.
Filtration: The melt is cooled to allow it to solidify and form solid particles. Then, the solid particles are separated from the melt by filtration.
Dissolution: leaching solid particles, using water or other solvents to dissolve tungstate from solids.
Separation: The impurities in the solution are separated by methods such as filtration or centrifugation.
Crystallization: By adjusting the conditions of the solution, such as temperature and concentration, the tungstate is crystallized to form tungstate crystals.
Roasting: Heat treatment of tungstate crystals to transform them into tungsten oxide.
Grinding and sieving: Grinding and sieving the calcined tungsten oxide to obtain the required particle size.
Packaging and storage: Pack the tungsten oxide well and store it properly for subsequent use or sale.
This is the general process of producing tungsten oxide by alkali fusion method. The specific production process and operating conditions may vary depending on the manufacturer and equipment. In actual production, it is also necessary to pay attention to the requirements of safe operation and environmental protection.
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