Method for preparing high-purity iron phosphate by utilizing pyrite cinder

The invention discloses a method for preparing high-purity iron phosphate by utilizing pyrite cinder. The method comprises the following steps: cleaning and drying pyrite cinder, grinding to form pyrite cinder powder, and mixing with an acid solution to form a mixture; heating the mixture to a temperature of 60-120 DEG C, carrying out hydrothermal reaction for 6-12 hours, performing solid-liquid separation, and collecting the reaction solution; regulating the temperature of the reaction solution to 60-100 DEG C, regulating the pH value to 1.0-1.5, stirring and purifying to obtain ferric hydroxide colloid; dissolving the ferric hydroxide colloid into a phosphoric acid solution, heating to the temperature of 80-160 DEG C, carrying out hydrothermal reaction for 6-12 hours, performing solid-liquid separation, and collecting the solid product; and washing, drying and calcining the solid product, thereby obtaining the high-purity iron phosphate. The method for preparing high-purity iron phosphate by utilizing pyrit