A process for preparing ammonium metatungstate (AMT) using ammonium paratungstate/APT as raw material comprising: leaching wet ammonium paratungstate/APT with nitrite acid to obtain a dilute solution of ammonium metatungstate; concentrating the dilute solution of ammonium metatungstate /AMT to be a concentrated solution of ammonium metatungstate/AMT; and spray-drying the concentrated solution of ammonium metatungstate/AMT to obtain powder of ammonium metatungstate/AMT.
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