Tungsten Oxide

Basic Trading Condition Product Name Ammonium Metatungstate Details WO3 Content: 91%min Quantity:1,000.00KG Price:42.00 USD/KG EXW XIAMEN, CHINA Payment:T/T in advance Delivery Time: in 20 working days Note: Re-check when quantity changed Contact Tel.:+86 592 512 9595  +86 592 512 9696 Email: sales@chinatungsten.com Business WeChat: Disclaimer The above quoted price is for reference only and shall not be used for final order. For detailed inquiry please contact us directly! Ammonium metatungstate (AMT) is an important intermediate compounds of tungsten hydrometallurgical process, chemical formula is (NH4)6H2W12O40.XH2O. It is white crystalline powder. It is soluble in water which is 300g WO3/100ml H2O (in 25℃). Ammonium Metatungstate is prepared from ammonium paratungstate (APT). Ammonium metatungstate is shorted for AMT. The content of WO3 is over 91.00%. Ammonium metatungstate is widely used in production of tungsten oxide, petroleum industry, ceramic industry, fireproo...

Basic Trading Condition Product Name Ammonium Metatungstate Details WO3 Content: 91%min Quantity:1,000.00KG Price:42.00 USD/KG EXW XIAMEN, CHINA Payment:T/T in advance Delivery Time: in 20 working days Note: Re-check when quantity changed Contact Tel.:+86 592 512 9595  +86 592 512 9696 Email: sales@chinatungsten.com Business WeChat: Disclaimer The above quoted price is for reference only and shall not be used for final order. For detailed inquiry please contact us directly! Ammonium metatungstate (AMT) is an important intermediate compounds of tungsten hydrometallurgical process, chemical formula is (NH4)6H2W12O40.XH2O. It is white crystalline powder. It is soluble in water which is 300g WO3/100ml H2O (in 25℃). Ammonium Metatungstate is prepared from ammonium paratungstate (APT). Ammonium metatungstate is shorted for AMT. The content of WO3 is over 91.00%. Ammonium metatungstate is widely used in production of tungsten oxide, petroleum industry, ceramic industry, fireproof fab...

Ammonium metatungstate (AMT) can be used as a thermal insulating material due to its unique thermal properties. When AMT is heated, it decomposes to form tungsten oxide, which has excellent thermal stability and a high melting point. This makes it an ideal material for use in high-temperature applications. AMT can be used as a thermal insulating material in a variety of forms, including coatings, fibers, and composites. For example, AMT can be applied as a coating on the surface of a substrate to provide thermal insulation. It can also be used as a filler material in polymer composites to improve their thermal properties. One advantage of using AMT as a thermal insulating material is its low thermal conductivity. AMT has a thermal conductivity of around 0.06 W/m·K, which is much lower than most metals and other common insulating materials. This means that AMT can provide excellent thermal insulation while also being lightweight and easy to handle. Overall, AMT ca...

Ammonium metatungstate (AMT) is a white crystalline powder that is used as a precursor to make tungsten metal and tungsten alloys, as well as a catalyst and a pigment in various industrial applications. AMT is generally considered to be relatively low in toxicity and not a significant environmental hazard, as long as it is handled and disposed of properly. However, as with any chemical, prolonged or excessive exposure can potentially be harmful. In terms of human health, ingestion or inhalation of AMT can cause irritation of the respiratory tract, eyes, and skin. It may also cause gastrointestinal distress, such as nausea, vomiting, and diarrhea. However, the risk of exposure to AMT is generally considered to be low, as it is not commonly found in consumer products or in the environment. In terms of environmental hazards, AMT is not considered to be toxic to aquatic life, but it may have harmful effects on soil microorganisms and plant growth if it is released...

  Ammonium metatungstate (AMT) is a white crystalline powder that is used in the production of tungsten metal, tungsten carbide, and other tungsten compounds. It is a stable compound under normal conditions, but it can decompose at high temperatures or in contact with strong acids or oxidizing agents. Here are some guidelines for the safe storage and handling of ammonium metatungstate: Storage: AMT should be stored in a cool, dry, well-ventilated area away from incompatible materials such as strong acids, oxidizing agents, and combustible materials. The storage area should be clearly labeled and access should be restricted to authorized personnel only. Handling: When handling AMT, wear appropriate personal protective equipment such as gloves, goggles, and a lab coat. Avoid direct contact with skin, eyes, and clothing. AMT should be handled in a fume hood to prevent inhalation of the powder. Use a dust mask or respirator if necessary. Transportation: AMT...

Ammonium metatungstate (AMT) can be synthesized by reacting sodium tungstate with ammonium chloride in aqueous solution, followed by acidification with hydrochloric acid. The reaction can be summarized by the following equation: Na2WO4 + 2NH4Cl + H2SO4 → (NH4)6H2W12O40·xH2O + 2NaCl + 2H2O In this reaction, sodium tungstate (Na2WO4) and ammonium chloride (NH4Cl) are dissolved in water and then mixed together. Sulfuric acid (H2SO4) is added to acidify the solution, which results in the formation of ammonium metatungstate as a precipitate. The precipitate is then filtered, washed, and dried to obtain the final product. The reaction conditions such as temperature, pH, and reactant concentrations can affect the yield and quality of the final product. The synthesis process can also be modified by using different tungsten sources or different ammonium salts. If you have any inquiry of  tungsten , please feel free to contact us: Email:  sales@chinatungsten.co...

Due to the intensification of the global greenhouse effect, extreme climate changes have been caused, resulting in a significant reduction in the area of arable land and making crops difficult to grow. Greenhouse cultivation can reduce the disasters caused by the climate to agricultural production, and maintain the stable production of crops, and solve the famine problems that may be faced in the future.  It is a gradual trend in crop planting methods. Due to the increasingly serious problem of oil shortage and global warming, the promotion of energy conservation and reduction of carbon dioxide emissions have become the goals of various governments. Among them, the promotion of energy-saving green buildings is a key project, so energy-saving greenhouses that can reduce energy use have also become a new development trend. The greenhouse shell shoulders the important functions of sheltering wind, rain, light regulation, heat insulation or heat preservation. The light-transmitting cov...

  Many scholars have tried new methods to reduce production cost. The direct synthesis of tungsten cobalt alloy powder from ammonium metatungstate is an innovative attempt. By ammonium metatungstate direct synthesis of WC-CO powder the process is roughly using ammonium metatungstate (APT), soluble cobalt salt and organic carbon source as raw materials, using spray conversion method, preparation of tungsten cobalt precursor by direct carbonization in situ synthesis method, the precursor for WC-CO carbide composite powder. The technology greatly simplifies the process of traditional technology, the cost is also reduced in theory. Some scholars using the preparation of ammonium metatungstate by AMT (WO 3 >92.5%), soluble cobalt salts and ultra pure organic carbon as raw materials, according to the wc-6% (mass fraction) CO composition prepared tungsten cobalt mixed solution, and then the preparation of tungsten cobalt precursor powder in spray drying tower, calcined in N 2  at...

The thermal degradation method is a process for the preparation of ammonium metatungstate based on ammonium paratungstate (APT). This method is also the mainstream process of preparing ammonium metatungstate (AMT). At present, China's industrial use of pyrolysis equipment is mainly rotary calciner, at the same time, there are a number of applications in other countries for AMT patented pyrolysis equipment, microwave heating furnace is one of them. Because the microwave energy level is close to the vibrational level of the water molecule, the hydrous material can dehydrate rapidly under the microwave field, which is also the working principle of the microwave heating furnace. Microwave heating furnace operating characteristics are: 1. Uniform and fast, which is the main characteristics of microwave drying. As the microwave has a large penetration capacity, heating can be generated directly within the medium heat, and the drying speed; 2. Selective, microwave heating...

Ammonium Metatungstate (AMT) is an important compound product in the process of tungsten smelting. It can be prepared by thermal degradation of Ammonium Paratungstate (APT) and can also be prepared by ion exchange with ammonium tungstate solution. Ammonium tungstate water soluble white crystalline powder or slightly yellow, ammonium metatungstate dissolved in water, ammonium paratungstate slightly soluble in water, which is the difference between ammonium metatungstate and ammonium paratungstate. Ammonium metatungstate is widely used as a raw material for the preparation of capacitors, nuclear shielding, flame retardants and corrosion inhibitors. It is also an excellent raw material for preparing superfine tungsten powder, high gravity alloy tungsten powder, phosphotungstic acid, arsenotungstic acid, silicotungstic acid. In fact, what really makes ammonium metatungstate play an important role is in the field of petroleum processing. The field of petroleum processi...

Ion Exchange method is the process of preparing ammonium metatungstate . It is made from ammonium wolframate solution or ammonium paratungstate.  This method is also one of the main methods for preparing ammonium metatungstate (AMT) at present. The main mechanism of ion exchange method is that use NH 4+  in H+ solution of strong acid or weak acid type H+ cation resin to process ion exchange. Under the condition of pH 3.5, H+ enters solution , cook for 5 hours at 98 °C. Converting ammonium tungstate into stable ammonium metatungstate solution. Then after evaporation and concentration, ammonium tungstate was converted to stable ammonium metatungstate solution. Again after evaporation and concentration, AMT crystals were prepared by freeze crystallization or spray drying. The resin saturated by NH 4+  is recycled after treatment with hydrochloric acid solution.  Because of the simple process and conv...

Ammonium Metatungstate (AMT) is an important compound product in tungsten smelting process.It is widely used in areas.  The common methods of preparing ammonium metatungstate include thermal degradation and ion exchange, extraction, nanofiltration, electrodialysis and neutralization. Nanofiltration membrane is a new type of pressure driven separation membrane developed since 1980s. Nanofiltration method is a membrane separation technique, which is independent from reverse osmosis membrane technology. Filter membrane is the main focus of nanofiltration. The separation performance of nanofiltration membrane is between reverse osmosis and ultrafiltration membrane. It has a good removal effect on low molecular weight substances, high valence ions, low valence cations and anions. Therefore, some scholars used the nanofiltration method to prepare ammonium metatungstate (AMT) from the original solution of ammonium paratun...

The extraction method is a preparation process that use ammonium tungstate with ammonium tungstate solution as raw material.  This method is also one of the processes for preparing Ammonium Metatungstate (AMT) at presnt. The extraction principle of ammonium metatungstate (AMT) extraction method is similar to that of ammonium tungstate extraction method, which needs to experience four stages including extraction, water washing and stripping. The whole extraction process is carried out in a box-type mixer-settlers, the difference is that in the reverse extraction operation, the concentration and dosage of the extractant are different. In the process of production, using ammonium tungstate solution as raw material, ammonium metatungstate was extracted by solvent extraction, extraction of NH4+ ion from ammonium metatungstate solution by a cationic extractant, then, the...

Ammonium metatungstate (AMT) is an important compound product in the process of tungsten smelting. It is widely used. The preparation methods of ammonium acid are heat degradation and ion exchange, extraction, electrodialysis and neutralization. The neutralization method called ammonium tungstate acid, ammonium paratungstate production is one of the commonly used method, but this method can also be used for the preparation of ammonium metatungstate, it is used in acid solution and the crystallization of APT, by controlling the pH value of 3-4, heating, stirring and other means to strengthen the ammonium tungstate solution is gradually converted into ammonium metatungstate solution then, the precipitation of AMT crystals. Some scholars use ammonium paratungstate as raw material, adopt continuous solution conversion method,compare the effect of two kinds of acidizing agents, nitric acid and cationic resin on the basis of experiment. After that, nitric acid is selecte...

Ammonium Metatungstate (AMT) is an important compound product in the process of tungsten smelting and it is widely used.  The common methods of preparing ammonium metatungstate include thermal degradation and ion exchange, extraction, electrodialysis and neutralization. Electrodialysis is the process of separating the electrolyte from the water by the selective conductivity of the ion exchange membrane under the action of the DC electric field. Under the action of the voltage, ammonium ion is used to form ammonium sulfate solution in the cathode solution of the circulation through anion exchange membrane. Electrodialysis method circulating pH = 9 ammonium metatungstate anode solution through the electrodialysis. Under the action of the voltage, the ammonium ion exchange membrane generates an ammonium sulfate solution through the anion in the circulating catholyte. The excess of ammonium ions in the anolyte begins to mass transfer, causing the pH to drop...

Ion Exchange method is the process of preparing ammonium metatungstate.It is made from ammonium wolframate solution or ammonium paratungstate.  This method is also one of the main methods for preparing ammonium metatungstate  (AMT) at present. The main mechanism of ion exchange method is that use NH 4+  in H+ solution of strong acid or weak acid type H+ cation resin to process ion exchange. Under the condition of pH 3.5, H+ enters solution , cook for 5 hours at 98 °C. Converting ammonium tungstate into stable ammonium metatungstate solution. Then after evaporation and concentration, ammonium tungstate was converted to stable ammonium metatungstate solution. Again after evaporation and concentration, AMT crystals were prepared by freeze crystallization or spray drying. The resin saturated by NH 4+  is recycled after treatment with hydrochloric acid solution.  Because of the simple process and conve...