PROCESS FOR RECOVERING SODIUM FLUOSILICATE FROM WET PROCESS PHOSPHORIC ACID

摘要

Sodium fluosilicate of high quality is recovered from wet process phosphoric acid by adding a sodium compound to phosphoric acid not containing substantial amount of fluosilicic acid dissolved therein to form an aqueous solution containing phosphoric acid and sodium dihydrogen-phosphate, adding said aqueous solution to wet process phosphoric acid containing fluosilicic acid dissolved therein and separating the resulting sodium fluosilicate crystals from the defluorinated phosphoric acid.