The solubility of(NH_4)_3PO_4in NH_3·H_2O solution was measured in the range from 10 °C to 70 °C by the method of isothermal solution saturation.Solubility data of the system was determined experimentally,and corresponding phase diagrams were constructed on the basis of solubility data.The results show that the solu-bility of(NH_4)_3PO_4declines with the increasing of ammonia concentration and decreasing of temperature.The solubility of(NH_4)_3PO_4declines with the decrease of the temperature when the conce...