Gypsum reprocessing for a cleaner environment
Jul 10, 2019 · The neutralisation process involves dosing a gypsum slurry with quick lime (CaO). The slurry is then aggressively agitated for several hours until neutralisation is complete. "This causes dissolved phosphates and fluorides to precipitate out of solution as insoluble calcium fluorides: CaF 2 and calcium phosphates: Ca 3 (PO4) 2.