Method for preparing iron phosphate by utilizing pyrite cinder

The invention discloses a method for preparing iron phosphate by utilizing pyrite cinder. The method comprises the following steps: cleaning and drying pyrite cinder, grinding to form pyrite cinder powder, adding a sulfuric acid solution into the pyrite cinder powder and stirring to form a mixture; heating the mixture to a temperature of 80-120 DEG C, carrying out hydrothermal reaction for 6-12 hours, performing solid-liquid separation, and collecting the reaction solution; adding phosphate into the reaction solution and stirring, regulating the temperature of the reaction solution to 60-90 DEG C, regulating the pH value to 1.8-2.0, continuously stirring, and standing to obtain a mixture in which a solid product is produced; and purifying the mixture to separate the solid product therein,and washing, drying and calcining the solid product, thereby obtaining the iron phosphate. The method for preparing iron phosphate by utilizing pyrite cinder provided by the invention is simple in process and mild in conditio