METHOD FOR RECYCLING RAFFINATE ACID IN PROCESS OF WET-PROCESS PURIFICATION PHOSPHORIC ACID PRODUCTION

The present disclosure belongs to the technical field of battery raw materials. Disclosed is a method for recycling raffinate acid in a process of wet-process purification phosphoric acid production. The method comprises: removing sulfur, fluorine, arsenic and heavy metals in raffinate acid to be treated, so as to obtain pretreated acid; pre-neutralizing the pretreated acid; then performing purification to obtain a purified liquid and precipitate residues containing iron, aluminum and magnesium; and rectifying the purified liquid to obtain industrial-grade phosphoric acid. The method can achieve effective recycling on the phosphorus resource in the raffinate acid, and the produced industrial-grade phosphoric acid can be used as a raw material to prepare battery-grade phosphates. La présente invention appartient au domaine technique des matières premières de batterie. L'invention concerne une méthode de recyclage d'acide de raffinat dans un procédé de production d'acide phosphorique de purification par voie hu