The particle size standard of ultrafine ammonium metatungstate does not have a uniform fixed value, it may vary according to different production processes, application areas and product quality requirements, so it can be set according to the preparation process and the requirements of the final product. Generally speaking, the particle size of ultrafine ammonium metatungstate may range from tens of nanometers to hundreds of nanometers, depending on the process parameters in the production process and the use of the product. In practical applications, the particle size distribution and size of ultrafine ammonium metatungstate can be measured and evaluated by particle size analyzing instruments.
A mixture of W03 and CuWO4 powder with a primary particle size between 100 nm and 200 nm was prepared from ammonium metatungstate by spray drying a roasting and ball milling process. This data is directly related to the particle size of ammonium metatungstate (or its derivatives) and can be regarded as one of the possible ranges of particle sizes for ultrafine ammonium metatungstate.
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