The preparation principle of sodium tungstate

Sodium tungstate is white and shiny flake crystal or crystalline powder, soluble in water, insoluble in ethanol, slightly soluble in ammonia. Weathered in the air. When heated to 100°C, it loses crystal water and becomes anhydrous. It reacts with strong acids (except hydrofluoric acid) to form water-insoluble yellow tungstic acid, reacts with phosphoric acid or phosphate to form phosphotungstic heteropolyacid complexes, and reacts with tartaric acid, citric acid, oxalic acid and other organic acids to form corresponding organic acid complexes compound.

Tungsten trioxide reacts with sodium hydroxide, or uses tungsten concentrate and sodium hydroxide to pressure cook to generate sodium tungstate solution, which is purified, filtered, ion exchange and other processes to separate impurity components, and then evaporate and crystallize to obtain sodium tungstate product .