Sodium tungstate is also called sodium tungstate dehydrate. The property of sodium tungstate is colorless crystal or white crystal orthorhombic system. It has the gloss of flaky crystal or crystalline powder. Melting point is 698 ℃ and relative density is 3.25. it effloresces in dry air and loses the crystal water by heating to 100 ℃.Sodium tungstate is soluble in water and aqueous solution is slightly alkaline. But it isn’t insoluble in ethanol and is slightly soluble in ammonia. 

             Sodium tungstate crystal powder

 

How to get sodium tungstate? At first, tungsten trioxide reacts with sodium hydroxide or tungsten concentrate boils with sodium hydroxide. Thus sodium tungstate solution can be produced. Then separate impurity components through a series of process, such as purification, filtration, ion exchange and so on. Finally, sodium tungstate products can be got by evaporation and crystallization. 

 

Sodium tungstate has wide uses and the very important industrial application value. It can be mainly summarized as the following points:

1. It is used for analysis reagent, catalyst and water treatment agent.

2. It is used in the manufacture of metal tungsten, tungsten acid and tungsten acid salts, such as phosphotungstic acid salt, boron tungstate and so on.

3. It is used in mordant, pigment, dyestuff, printing ink. Mordant is very useful in chemistry and biology. When dyeing of cells and tissues, it’s available to use cells, tissues and pigment combination drug solution. It can make the material dyed. The drug solution is the mordant. It also refers that dye is dyed to fabric material to reach the purpose of dye. 

4. Weavers use it as fabric weighting agent. The mixture of sodium tungstate, ammonium sulfate and ammonium phosphate can be used for fiber fire prevention and waterproof. This kind of fiber can make fire retardant rayon and spun rayon. It can also be used for leather tanning.

5. It is used for plating anticorrosion. Plating can enhance the corrosion resistance and hardness of the metal plating. Wear and tear can be prevented. Electrical conductivity, smoothness and thermal stability can be improved. And surface is beautiful.

6. It is used as a cosolvent introduced porcelain glaze material to reduce the fever temperature and complement colors.

7. It is used in the oil industry and manufacture of aviation and aerospace materials.