Abstract: The present application discloses a method for preparing ferric phosphate, including the following steps: mixing a surfactant with a first metal liquid containing iron and phosphorus elements, adding with adding seed crystal, aging under heating and stirring, filtering the aged solution to obtain a filter residue, and drying and sintering the filter residue, thereby obtaining the ferric phosphate; the seed crystal is ferric phosphate dihydrate or basic ammonium ferric phosphate. In the present application, the surfactant is used for modification of the seed crystal, secondary crystal nucleus is generated, which induces the formation of the basic framework of the product particles. Through the aging process, the deposition of the crystal nucleus on the surface of the seed crystal makes the framework of the crystal grain more complete, so that the primary particles are arranged more densely and orderly and tend to constitute spherical secondary particles.

Abstract: Disclosed is a preparation method for high-purity iron phosphate and use thereof, including: mixing and stirring an iron phosphide waste, an acid liquor, an oxidant, and an adsorbent, heating for leaching, and subjecting a resulting mixture to solid-liquid separation (SLS) to obtain a first filtrate and a first filter residue; adding an alkali liquor to the first filtrate to adjust a pH, holding a temperature of a resulting mixture, and subjecting the mixture to SLS to obtain a second filter residue and a second filtrate; and subjecting the second filter residue to a heat treatment to obtain iron oxide; subjecting the iron oxide to high-energy ball-milling, and adding a surfactant for activation to obtain a slurry; and mixing the slurry with phosphoric acid, heating to allow a reaction, subjecting a resulting mixture to SLS to obtain a solid, and washing and sintering the solid to obtain the iron phosphate.