Ammonium tungsten oxide hydrate
AMMONIUM TUNGSTATE
CAS: 11140-77-5
Molecular Formula: H8N2O4W
Ammonium tungsten oxide hydrate - Names and Identifiers
| Name | AMMONIUM TUNGSTATE |
| Synonyms | AMMONIUM TUNGSTATE Ammonium tungsten oxide hydrate |
| CAS | 11140-77-5 |
| EINECS | 628-957-5 |
Ammonium tungsten oxide hydrate - Physico-chemical Properties
| Molecular Formula | H8N2O4W |
| Molar Mass | 283.91452 |
| Melting Point | 3410 ℃(lit.) |
| Boling Point | 5660 ℃(lit.) |
| Water Solubility | Soluble in warm water |
| Solubility | Soluble in water, insoluble in alcohol. |
| Appearance | White crystal |
| Exposure Limit | ACGIH: TWA 3 mg/m3 |
| Storage Condition | Room Temprature |
| MDL | MFCD00015956 |
| Physical and Chemical Properties | WGK Germany:3 |
Ammonium tungsten oxide hydrate - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
| WGK Germany | 3 |
| HS Code | 28418040 |
Ammonium tungsten oxide hydrate - Reference
| Reference Show more | 1. [IF=12.732] Rong Zhang et al."Energy-efficient smart window based on a thermochromic microgel with ultrahigh visible transparency and infrared transmittance modulation."J Mater Chem A. 2021 Aug;9(32):17481-17491 |
Ammonium tungsten oxide hydrate - Reference Information
| main application | ammonium tungstate can be used to produce lubricants, corrosion inhibitors, pigments, fertilizers and catalysts; It can also be used to produce WO3 and W powder, and then process it into tungsten metal products such as tungsten strip, tungsten crucible, tungsten wire, tungsten rod, tungsten electrode, tungsten slab, tungsten alloy, etc. In addition, it is also used in supercapacitors, nanomaterials, optoelectronic materials, superconducting materials, hydrogen storage materials, fuel cells and other industries. It is widely used in steel, cemented carbide, metal processing, electronic components, electric light sources, electric vacuum, metallurgy, chemical and chemical industries, Pharmaceutical biology, aerospace and military industries. |
| preparation method | ammonium tungstate is mainly prepared by evaporation method in industry, I .e. ammonium polytungstate raw materials of industrial secondary products are dissolved in ammonia water and then evaporated and crystallized. in view of the relatively large liquid-solid ratio and long evaporation time when ammonium polytungstate is dissolved in ammonia, in this way, some impurities (such as iron, etc.) will be brought into ammonium tungstate due to the long-term stirring of the ammonium tungstate solution in the stainless steel reaction axe. In addition, due to the imbalance of temperature gradient and alkalinity mass transfer, ammonium tungstate is caused by the growth rate of small particles. The crystal peritectic and cladding of the grains are caused by different growth rates, which leads to impurity entrainment and reduces the purity of ammonium tungstate products, the purity of the products produced is difficult to exceed the national standard of ammonium tungstate (GB/T 10116?2007) zero grade, even difficult to exceed the national standard of ammonium tungstate (GB/T 10116?2007) Level 1, unable to meet the growing demand for high-purity and ultra-pure ammonium tungstate in the fields of electronics industry, chemical synthesis, petroleum catalysis, etc. |
Last Update：2024-04-10 22:29:15
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