Sodium tungstate solution is generated by tungstic acid and sodium hydroxide solution, and then disodium hydrogen phosphate is added to the sodium tungstate solution to form a mixed solution of phosphotungstic acid and sodium phosphotungstate under heating and acidic conditions, and then added to the mixed solution Add ether complex extraction to obtain sodium phosphotungstate (Na3O40PW12) solution, then add concentrated hydrochloric acid to the sodium phosphotungstate solution, concentrate and crystallize, dry and pulverize to obtain powdered sodium phosphotungstate.
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