Ammonium Paratungstate
Ammonium paratungstate is a white crystalline salt of ammonium and tungsten, with the chemical formula (NH4)10(W12O41)·5H2O. It is insoluble in water, mainly used for preparation of ammonium metatungstate, tungsten oxide and tungsten powder. Heating ammonium paratungstate to 220-280°C loses part of ammonia and crystal water, which can be converted into ammonium metatungstate AMT, heating to above 600°C, loses all ammonia and crystal water, and completely transforms into tungsten trioxide.
APT Specification
| Grade | APT-0 | |||||||||||
| WO3 Content(≥%min) | 88.5 | |||||||||||
| Impurity(%max) | ||||||||||||
| Impurity | Al | As | Bi | Ca | Cd | Cr | Co | Cu | Fe | Mg | Mn | Mo |
| MAX | 0.0005 | 0.0010 | 0.0001 | 0.0010 | 0.0010 | 0.0010 | 0.0010 | 0.0003 | 0.0010 | 0.0005 | 0.0005 | 0.0020 |
| Impurity | Na | Ni | K | P | Pb | S | Sb | Si | Sn | Ti | V | LOI |
| MAX | 0.0010 | 0.0005 | 0.0010 | 0.0007 | 0.0001 | 0.0008 | 0.0005 | 0.0010 | 0.0002 | 0.0010 | 0.0010 | 11.5 |
Related Products:
0.6um yellow tungsten oxide is a kind of tungsten oxide, with a positive yellow powder appearance, stable properties at normal temperature and apparent density of 0.6-1.0g/cm3.
Ammonium metatungstate(AMT) is an important intermediate compounds of tungsten hydrometallurgical process, appearance is white crystalline powder, solubility in water is the largest in the tungsten compounds which over 300g WO3/100ml H2O (in 25℃).
Sodium tungstate, a tungstate of sodium, is useful as a source of tungsten. It is prepared from tungsten ores used to manufacture tungsten by reducing it.
Purple Tungsten oxide is divided into WO2.72 (or W18O49). It is a kind of tungsten oxide. It is abbreviated as VTO. It is a purple finely grained crystalline powder, and its color usually appears purple or blue purple.