ELECTROCHEMICAL METHOD OF PRODUCING PHOSPHORIC ACID Russian patent published in 2017 - IPC C01B25/20 C08J11/00 

FIELD: chemistry.

SUBSTANCE: invention relates to technology of inorganic substances, in particular, to recycling slime-contaminated white phosphorus and production of phosphoric acid. Method of producing phosphoric acid involves loading slime-contaminated white phosphorus into an electrolyser, where oxygen, obtained by electrolysis of water on a mesh anode, is used to oxidise slime-contaminated white phosphorus to form phosphorus pentoxide, followed by hydrating to form phosphoric acid. Direct current is fed to electrodes at voltage of 10 V, current density is 0.10 A/cm², and processing time depends on amount of slime-containing white phosphorus. Conducting process according to proposed in a single apparatus enables to recycle phosphorus, contaminated with slime, and form intermediate phosphorus-containing compounds, preventing emissions of toxic compounds.

EFFECT: technical result is recycling slime-contaminated phosphorus, obtaining pure phosphoric acid in a single apparatus and preventing loss of P₂O₅ with emissions into atmosphere.

1 cl, 2 ex