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Process for purifying phosphogysum

Patent ·
OSTI ID:6810828
;
A process for reducing radioactive contamination of phosphogypsum. Phosphogypsum containing radioactive material is calcined to form hemihydrate crystals carrying the radioactive contaminants, and a portion of the crystals is converted to substantially radiation-free gypsum crystals which are readily separated from the hemihydrate crystal relics containing substantially all of the radioactive contamination.
Assignee:
United States Gypsum Co., Chicago, IL
Patent Number(s):
US 4421731
OSTI ID:
6810828
Country of Publication:
United States
Language:
English

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Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ALKALINE EARTH METAL COMPOUNDS
CALCINATION
CALCIUM COMPOUNDS
CALCIUM SULFATES
CHEMICAL REACTIONS
CLEANING
CRYSTALLIZATION
CRYSTALS
DECOMPOSITION
DECONTAMINATION
GYPSUM
HYDRATES
MATERIALS
MINERALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHORUS COMPOUNDS
PYROLYSIS
RADIOACTIVE MATERIALS
REMOVAL
SEPARATION PROCESSES
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES