C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/324, 23/67, 2
C01B 25/00 (2006.01) C01B 25/18 (2006.01) C01B 25/22 (2006.01) C01B 25/223 (2006.01) C01B 25/234 (2006.01) C01B 25/30 (2006.01) C01B 25/32 (2006.01) C01B 25/46 (2006.01) C01F 11/22 (2006.01) C05D 9/02 (2006.01)
Patent
CA 1042626
PRODUCTION OF FLUORIDE-FREE PHOSPHATES ABSTRACT OF THE DISCLOSURE A method for the acidulation of phosphate rock and the production of substantially pure alkali metal phosphates, calcium phosphates, and phosphoric acid which are essentially free of fluorides and recovery of the fluorine values from the starting phosphate rock in useful form, by steps comprising initial acidulation of phosphate rock with a phosphoric acid solution containing sufficient alkali metal values to provide R2O in the system, where R is alkali metal, to solubilize the phosphates and form an insoluble precipitate comprising a mixture of impurities, sand (SiO2) and the fluorides, from which the fluorides can be recovered in usable form. In optional embodiments, after removal of the precipitate containing the fluorides, a portion of the solution of phosphoric acid and calcium phosphate can be reacted with sulfuric acid and RHSO4 or R2SO4 to form a solution of RH2PO4 and phosphoric acid and at least a portion of the RH2PO4 and phosphoric acid solution is recycled to the initial acidulation to provide the R2O and phosphoric acid makeup.
236917
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