C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/59, 23/78
C01B 25/10 (2006.01) C01B 25/18 (2006.01) C01B 25/22 (2006.01)
Patent
CA 1110823
Abstract of the Disclosure An improved method for treating calcium phosphate sources such as bone phosphate and phosphate rock with fluorosulfonic acid in the presence of a limited a amount of moisture whereby over 98.00% of the phosphorous is converted to volatile compounds that can be subsequently hydrolyzed. A substantial excess of fluorosulfonic acid is utilized to contact the phosphate ore as a slurry. The phosphorous products are primarily phosphorous pentafluoride and phosphorous oxyfluo- ride, and to a limited extent difluorophosphoric acid. A trace of water apparently catalyzes the reaction. The pro- duction of phosphorous pentafluoride is favored by up to one part of water to eight parts of ore by weight in the presence of excesses of fluorosulfonic acid. The method includes the hydrolysis of the volatile compounds to phosphoric acid and hydrogen fluoride. Hydrogen fluoride is then recycled to react with the required sulfur trioxide to make the require- ment of fluorosulfonic acid for the process. Fluorosulfonic acid not consumed in the process is recovered for reuse in the process. Dependent on the form of silica impurities in the ore, a net production of hydrogen fluoride may be ob- tained from the fluoride content of the rock. The process is relatively self-sustaining as far as hydrogen fluoride used for making fluorosulfonic acid requirements is concerned. Sulfur trioxide is essentially the net reagent required to treat the ore to produce the volatile phosphorous interme- diates for subsequent conversion to phosphoric acid and hydrogen fluoride.
342705
Cannon Curtis W.
Hall Robert N.
Climax Chemical Company
Smart & Biggar
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