Method for preparing high-purity iron phosphate material from ferrophosphorus slag, high-purity iron phosphate and application

The invention provides a method for preparing a high-purity iron phosphate material from ferrophosphorus slag, high-purity iron phosphate and application. Comprising the following steps: carrying out acid pickling on the ferrophosphorus slag by using a first type of acid to remove active metal impurities in the ferrophosphorus slag so as to obtain impurity-removed ferrophosphorus slag; mixing the impurity-removed ferrophosphorus slag with a second type of acid, and digesting the impurity-removed ferrophosphorus slag to obtain a first ferrophosphorus liquid containing phosphorus and iron; supplementing a phosphorus source into the first ferrophosphorus liquid to obtain a second ferrophosphorus liquid; heating and evaporating the second ferrophosphorus liquid to volatilize and remove the second acid, so as to adjust the pH value of the second ferrophosphorus liquid until crude iron phosphate is separated out; and carrying out acid pickling on the crude iron phosphate by using a first type of acid so as to remov