The preparation method of Ammonium Metatungstate Microspheres mainly includes the following steps, which I will summarize in a clear and point-by-point manner, combining with the relevant figures and information in the referenced articles:
Raw material preparation
Ammonium metatungstate is formulated as a 2.5 to 50 wt% aqueous solution. Formulation in this concentration range is critical to ensure microsphere formation in subsequent steps.
Addition of Surfactant & Ultrasonic Oscillation (optional step depending on process needs)
In some preparation methods, a surfactant is added to the aqueous solution of ammonium metatungstate and ultrasonication is performed for 20~50 min. this step can further adjust and control the structure and properties of the microspheres.
Spray drying
The prepared aqueous solution of ammonium metatungstate was introduced into a spray dryer.
The inlet temperature of the hot air nozzle was controlled to be 100250°C and the temperature at the outlet of the exhaust air was 60130°C. These temperature control parameters have an important influence on the formation and properties of the microspheres.
After spray drying, the water in the solution evaporates rapidly and spherical ammonium metatungstate particles are formed.
Preparation equipment selection
Depending on the need, different spray dryers can be selected for preparation. For example, the ammonium metatungstate particles prepared by using airflow spray dryer are mostly hollow spherical particles, while those prepared by using centrifugal spray dryer are mostly solid spherical particles.
Subsequent treatment (optional step according to process needs)
According to the specific application requirements, the prepared ammonium metatungstate microspheres can be subjected to subsequent treatments, such as heat treatment, surface modification, etc., to further optimize their properties.
Collection and Storage
Collect the prepared ammonium metatungstate microspheres and store them appropriately to prevent them from moisture, contamination or deterioration.
By the above steps, ammonium metatungstate microspheres with specific structures and properties can be prepared, and these microspheres have a wide range of applications in the fields of catalysts, electronics, metallurgy and the like.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
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