Phosphoric acid production gypsum filtration flocculant pre-dilution (make down) with post-filtration phosphoric acid

摘要

A method for minimizing the addition of water to a phosphoric acid production process is described. The method uses phosphoric acid to make down a flocculant that is added to the process in order to promote filtration or clarification of crude phosphoric acid. Preferably, the phosphoric acid is a crude, clarified phosphoric acid that is recycled from the phosphoric acid production process itself.

主权项

1. A method of adding flocculant to a phosphoric acid production process which includes providing a gypsum slurry, the method comprising:
creating a flocculant-acid substance by mixing phosphoric acid and a flocculant emulsion comprising 93 mole percent acrylamide and 7 mole percent sodium acrylate copolymer, thereby inverting the emulsion and causing a change in conformation of the copolymer; introducing the flocculant-acid substance into the gypsum slurry of the phosphoric acid production process.