C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/67, 20/76
C01B 25/22 (2006.01) C01B 25/225 (2006.01) C01B 25/237 (2006.01) C01B 25/30 (2006.01) C05B 11/08 (2006.01)
Patent
CA 1088724
FLUORIDE-FREE PHOSPHATE REACTIONS ABSTRACT OF THE DISCLOSURE. Substantially fluoride-free phosphoric acid is produced by the acidulation of phosphate rock with sulfuric acid wherein the acidulation reaction is conducted in the presence of added potassium as K2O bearing compounds, e.g. KHSO4, K2SO4, KH2PO4 or KOH, and additional silica, to precipitate fluorides and silica as potassium silico- fluoride and then removed on separation of the gypsum formed. Optionally, additional silica may be added to the phosphoric acid solution recovered after precipitation and removal of the gypsum, to precipitate additional fluoride as potassium silicofluoride to further purify the phosphoric acid. In a further embodiment sufficient potassium may be added along with additional silica in the acidulation step to produce potassium dihydrogen phosphate and phosphoric acid as additional products. - 1 -
280366
Drechsel Erhart K.
Sardisco John B.
Johnson & Hicks
Pennzoil Company
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