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U.S. Department of Energy
Office of Scientific and Technical Information

Process for producing phosphoric acid

Patent ·
OSTI ID:5750587

Phosphoric acid and gypsum are produced from phosphate rock by digesting same with sulfuric acid to produce a high concentration of phosphoric acid and calcium sulfate hemihydrate. The solubilized uranium in the rock is rendered recoverable by reducing same from the +6 valence state to the +4 valence state during the digestion step followed by oxidizing back to the +6 valence state in a subsequent step.

Assignee:
Swiss Aluminium Ltd (Switzerland)
Patent Number(s):
US 4311677
OSTI ID:
5750587
Country of Publication:
United States
Language:
English