Phosphohemihydrate process for purification of gypsum
Patent
·
OSTI ID:7101269
A wet process for producing phosphoric acid and phosphohemihydrate by acidulation of phosphate rock. A strong phosphoric acid is obtained with concomitant production of an improved calcium sulfate that is extremely low in radioactivity by operation in Region II for shorter time so as to produce small sized hemihydrate particles, then hydration of a substantial proportion but less than all of the hemihydrate to coarse gypsum substantially free of radioactivity in a dilute acidic aqueous slurry at a temperature and P/sub 2/O/sub 5/ concentration selected so as to be within Region I of FIG. 1 and having a substantial weight proportion of coarser gypsum particles that are substantially free of radioactivity.
- Assignee:
- United States Gypsum Co., Chicago, IL
- Patent Number(s):
- US 4424196
- OSTI ID:
- 7101269
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400700* -- Radiochemistry & Nuclear Chemistry
ACIDIFICATION
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
CALCIUM COMPOUNDS
CALCIUM SULFATES
CLEANING
DECONTAMINATION
DISPERSIONS
GYPSUM
HYDRATES
HYDRATION
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MINERALS
MIXTURES
OXYGEN COMPOUNDS
PARTICLE SIZE
PH VALUE
PHOSPHATE ROCKS
PHOSPHORIC ACID
PHOSPHORUS COMPOUNDS
PROCESS SOLUTIONS
PRODUCTION
PURIFICATION
RADIOACTIVITY
ROCKS
SEDIMENTARY ROCKS
SIZE
SOLUTIONS
SOLVATION
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
400700* -- Radiochemistry & Nuclear Chemistry
ACIDIFICATION
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
CALCIUM COMPOUNDS
CALCIUM SULFATES
CLEANING
DECONTAMINATION
DISPERSIONS
GYPSUM
HYDRATES
HYDRATION
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MINERALS
MIXTURES
OXYGEN COMPOUNDS
PARTICLE SIZE
PH VALUE
PHOSPHATE ROCKS
PHOSPHORIC ACID
PHOSPHORUS COMPOUNDS
PROCESS SOLUTIONS
PRODUCTION
PURIFICATION
RADIOACTIVITY
ROCKS
SEDIMENTARY ROCKS
SIZE
SOLUTIONS
SOLVATION
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS