Method for recycling vanadium precipitating wastewater

The invention provides a method for recycling vanadium precipitating wastewater. The method comprises the following steps: (a) adding a reducing agent into the vanadium precipitating wastewater to perform reduction reaction, and reducing hexavalent chromium in the vanadium precipitating wastewater into trivalent chromium to obtain a first solution; (b) adding alkaline liquor into the first solution to obtain a mixed solution, heating the mixed solution at 60-90 DEG C, stirring at the same time, and filtering after complete reaction to obtain chromium slag and a second solution; (c) adding roasting clinker into the second solution, uniformly stirring, and performing solid-liquid separation to obtain a vanadium-containing leaching solution and tailings; (d) adding a phosphorus removal agent and activated carbon into the vanadium-containing leaching solution, performing impurity removal and purification on the vanadium-containing leaching solution, and filtering to obtain vanadium-containing qualified liquid; and (e) adding ammonium sulfate and sulfuric acid into the vanadium-containing qualified liquid, and performing vanadium precipitation operation to obtain ammonium polyorthovanadate. According to the method provided by the invention, the vanadium precipitating wastewater can be furthest used, and the treatment quantity and treatment cost of the vanadium precipitating wastewater can be reduced.