Method for resource utilization of iron phosphate production wastewater

The invention discloses a method for resource utilization of iron phosphate production wastewater, and belongs to the field of industrial wastewater treatment. The invention relates to an iron phosphate production wastewater resource utilization method, which comprises: a, carrying out MVR forced evaporation crystallization on iron phosphate production wastewater, discharging to a thickener 1, and thickening to obtain a supernatant 1; b, feeding the supernatant 1 to a thickener 2 for thickening again to obtain supernatant 2; c, feeding the supernate 2 to a mother liquor buffer tank, adding water and iron phosphate production wastewater for callback, feeding the callback slurry into a freezing crystallization kettle for cooling crystallization, and then carrying out solid-liquid separation to obtain a solid; and d, washing the solid with water to obtain ammonium dihydrogen phosphate, and returning the ammonium dihydrogen phosphate to an iron phosphate production line for recycling. According to the method for