1、For the mordant, analytical reagents, catalysts, water treatment chemicals, manufacturing fireproof, waterproof material, and phosphorus tungstate, tungsten, boron salts.
2、For the manufacture of tungsten, tungsten acid, tungstate,etc.
3、For the mordant, pigments, dyes, inks.
4、 As a weighting agent for fabric by weavers. This product is used as textile assistants. And a mixture of tungsten acid, ammonium sulfate, ammonium phosphate and other components used in fiber fire and water. This kind of fibers can be made into fireproof rayon and rayon. It can also be used in tanning leather.
5、As anti-corrosion coating for electroplating.
6、As a co-solvent playing a role in reducing firing temperature and complementary color when introducing enamel pigment.
7、For petroleum and aerospace manufacturing industry, aerospace materials.

 

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Names

IUPAC name   Sodium tungstate

Identifiers

CAS Registry Number   13472-45-2

PubChem       26052

RTECS number     YO7875000

Properties

Chemical formula Na2WO4

Molar mass    293.82 g·mol−1

Appearance    white rhombohedral crystals

Density    4.179 g/cm3 (anhydrous)

3.25 g/cm3 (dihydrate)

Melting point        698 °C (1,288 °F; 971 K)

Solubility in water

57.5 g/100 mL (0 °C)

74.2 g/100 mL (25 °C)

96.9 g/100 mL (100 °C)

Solubility      slightly soluble in ammonia insoluble in alcohol, acid

Structure

Crystal structure   rhombic (anhydrous)

orthorhombic (dihydrate)

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

 

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Metatungstic acid, a polylactic acid, is the only compound that the structure has been identified in a variety of tungsten acids, as colorless crystals. It belongs to 12-tungstophosphoric acid with a simple formula H6 [H2 (W3O10) 4]·nH2O, n is 10 or 23; a density of 3.93 g / cm 3, decomposition at 50 ℃; large solubility for 88.57 g / 100 cm 3 of water (25 ℃). It ‘s transformed from metatungstic acid salt that was an important industrial product developed in late 1970s, mainly as catalyst. Metatungstate was prepared by ammonium paratungstate, may also be obtained from white microcrystalline powdery tungstic acid. Many other metatungstic acid salt, including various metal salts and more bicarbonate salts, etc., can be obtained from white microcrystalline powdery tungstic acid directly or indirectly. Paratungstate is another isopolytungstate that the simple formula (NH4) 10 [H2W12O42]·nH2O, made from sodium tungstate solution by ion exchange method, was not able to give the corresponding free acid. Burning ammonium paratungstate can obtain tungsten trioxide without sodium.

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Tungstic acid is insoluble in most acids, but dissolves slightly in hydrochloric acid and is readily soluble in hydrofluoric acid, as is shown in the following table:

It is readily soluble in alkalies.

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Tungsten carbide tipped saw blade is a saw blade used steel made blade as its main body, and with small tips of carbide brazed on to the body. It is claimed that a fine tungsten carbide tipped saw blade will provide a ten to twenty times longer tool life compared to a normal steel tipped saw blade. But it should be noticed that, eventually the tungsten carbide tip do get dull.

Generally, the sharpening techniques of tungsten carbide tipped saw blade are similar to the steel ones, whereas the abrasive is different. For the tungsten carbide tips, as they are extremely hard, the applying abrasive usually is diamond or a carbide abrasive wheel, which hardness could overweight the tungsten carbide tips.
 

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Tungsten carbide trepanning tool is a metal cutting tool usually with one carbide tip, which is suitable for toroidal shape cutting and deep hole boring. It is also used to grooves creating. Generally the key advantages related to using tungsten carbide trepanning tools are comprised as follow,

Less Effort

Compared to the conventional types of drills, tungsten carbide trepanning tool requires less effort. During the drilling processes, as boring through metals needs to create holes and remove all the materials involved in the holes, while trepanning only requires to cut out an annulus.  

Indexable

The indexable ability related to the tungsten carbide trepanning tools refers to the tools are adaptable and versatile, which could generate holes with various types and different diameters.


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Tungstic acid, H2WO4, is formed as an amorphous yellow precipitate when an excess of hot hydrochloric acid is added to a solution of an alkali tungstate. If cold acid is used a white precipitate of the hydrate, H2WO4.H2O, results, from which the acid may be obtained either by boiling the mixture or by drying over sulphuric acid. It may also be prepared by the following methods:

1.By digesting a tungsten mineral with hydrochloric acid and then with aqua regia until the iron and manganese are dissolved and a yellow residue remains. This, after washing, is shaken with ammonia, which dissolves the free tungstic acid. The liquid is filtered, and on concentration tungstic acid crystallises out.

2.By heating the mineral under pressure with concentrated potash solution and lime, the tungstic acid being subsequently separated from the resulting solution by fractional precipitation.

3.By fusion of the finely powdered mineral with alkali carbonates, sodium chloride, or calcium chloride. The residue is treated with water and then with nitric or hydrochloric acid to decompose any insoluble tungstates. The acid may be further purified by solution in ammonia and precipitation with dilute nitric acid, or by means of chlorine.

The white hydrate, H2WO4.H2O, is produced by the decomposition of tungsten pentachloride, or the oxychlorides, in presence of moist air.

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Easy to Clean

Since the tungsten carbide trepanning tool is designed typically for cutting an annulus and leaving a centre core with large diameter, and does not remove the whole material in drilling operation, it generates fewer chips, and which ease the cleaning processes for the operator. With this easy and fast cleaning operation, sometimes the worker could continue their work without unnecessary stop.



Higher Accuracy

It is indicated that tungsten carbide trepanning tool owns very close tolerances, which enables the tool to achieve higher level of accuracy.

Specially, the cylinder eliminated by the tungsten carbide trepanning tool could be recycled and adopted as a raw material for other products.


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Hydrates of Tungsten Trioxide, Tungstic Acid. - Two well defined hydrates of tungsten trioxide are known:

1.A yellow monohydrate, WO3.H2O, and

2.A white dihydrate, WO3.2H2O. With bases, both hydrates produce the same series of salts, and the first appears to be the true acid, tungstic acid, H2WO4, whilst the second is the hydrate, H2WO4.H2O. Both are insoluble in water, but colloidal forms of the acid exist. Several other hydrates have been described, but except in the case of the complex hydrate known as metatungstic acid their existence has not been established.

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Tungsten carbide trepanning tool refers to a metal cutting tool that is used for toroidal shape cutting and deep hole boring. It is also used to grooves creating. It normally has one carbide tip and could be widely applied in various materials that are flat, such as sheet metal, rods, plates or any ferrous or non ferrous materials.

Since the tungsten carbide trepanning tool is typically for cutting an annulus and leave a centre core with large diameters, compared to a standard drill, it displays more economical and feasible in hole making application. Specially, the tungsten carbide trepanning tools usually require water to cool down the cutting tips and eliminate chips from the hole making processes.


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