The treatment of phosphogypsum leachate is more urgent than phosphogypsum.

ABSTRACT

Phosphogypsum(PG) is one of the typical bulk industrial solid wastes generated in the phosphate chemical industry. Due to its huge production volume and immature resource treatment technology, a large amount of PG can only be stored and disposed in slag yards, and its impact on the ecological environment is becoming increasingly significant during long-term storage. Up to now, many researchers have focused their research on PG, with less attention paid to the PG leachate(PG-L). On the basis of the resource utilization of PG, this article analyzed the migration and transformation of pollutants and their impact on the ecological environment during long-term storage of PG. The content of pollutants in PG-L and PG was compared, and it was found that the content of toxic and harmful substances in PG-L was significantly higher than that in PG itself, and the pollution diffusion ability was greater than that of PG, the pollution of PG to the ecological environment is mainly caused by PG-L, indicating that the harmless treatment of PG-L is more urgent than PG. On the basis of traditional leachate treatment methods, a new technology of valuable element recovery and electrochemical synergistic treatment is proposed to achieve high value-added treatment of PG-L.