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
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Related Subjects
050400* -- Nuclear Fuels-- Feed Processing
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
ACTINIDES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM SULFATES
CHEMICAL REACTIONS
ELEMENTS
GYPSUM
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
MINERALS
OXYGEN COMPOUNDS
PHOSPHATE ROCKS
PHOSPHORIC ACID
PRODUCTION
RECOVERY
REDOX REACTIONS
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
SULFATES
SULFUR COMPOUNDS
SULFURIC ACID
URANIUM
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
ACTINIDES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM SULFATES
CHEMICAL REACTIONS
ELEMENTS
GYPSUM
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
MINERALS
OXYGEN COMPOUNDS
PHOSPHATE ROCKS
PHOSPHORIC ACID
PRODUCTION
RECOVERY
REDOX REACTIONS
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
SULFATES
SULFUR COMPOUNDS
SULFURIC ACID
URANIUM