Sodium metatungstate [Na6(H2W12O40)]•nH2O, also known as sodium polytungstate, sodium polytungstate. Its biggest feature is that the solution density changes greatly with the concentration, and the maximum can reach 3.1g/cm3. As a new type of inorganic heavy liquid, high-density sodium metatungstate concentrate is used in the separation and purification of fine minerals. The incomparable advantages of the heavy liquid. Therefore, many places where organic heavy liquid must be used can be replaced by concentrated sodium metatungstate. In addition, sodium metatungstate solution can also be used in oil drilling, as an important intermediate product in the manufacture of heteropolytungstate, as an electrode in fuel cells, in cigarette filters, and even in fireproof textiles.
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