Production method of sodium chromate with alkali liquid circulation and liquid phase oxidization

A production method of sodium chromate with alkali liquid circulation and liquid phase oxidization includes following steps: (1) carrying out a reaction to chromite ore powder and an oxidizing gas in an alkali solution; (2) diluting the reaction product in the step (1) to enable sodium chromate to enter a liquid phase completely; (3) performing solid-liquid separation to the mixture obtained in the step (2); (4) concentrating an obtain liquid to enable the concentration of alkali is equal to that in the step (1), carrying out the solid-liquid separation to obtain crude sodium chromate crystal, and washing the crude sodium chromate crystal with a saturated sodium chromate solution and drying the washed sodium chromate crystal to obtain a qualified sodium chromate product; (5) adding the alkali solution being same in concentration with the alkali solution in the step (1) to the concentrated solution in the step (4) to enable the mass of the alkali solution in the mixed concentrated solution is equal to that of the alkali solution in the step (1), and adding the chromite ore powder being equal to the chromite ore powder in the step (1) in mass and performing circulation operation. In the invention, according to a characteristic that different products are different in solubility under different conditions, reasonable conditions are selected for carrying out reaction and circulation, so that the production method is greatly reduced in processes, is greatly reduced in purification difficulty and is reduced in operation cost.