Evaporation crystallization is the main method for producing ammonium paratungstate, enamel reactor and continuous crystallizer are usually used as reacting equipment.

Ammonium paratungstate thermal decomposition method producing ammonium metatungstate is the typical and main process to produce AMT by solid phase transition method.

Sodium polytungstate is also called sodium metatungstate, it has the advantages of high density, ordorless, easy to synthesis and can be recycled, it is largely applied in density separation in geology and soil science.

Sodium tungstate and sodium molybdate are two different substances with their difference reflecting in physical, chemical property and application.