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Process for reducing radioactive contamination in phosphogypsum

Patent ·
OSTI ID:5963531
;
A process of two crystallization stages for reducing radioactive contamination of phosphogypsum is disclosed. In the process anhydrite crystals are obtained through dehydration of the radiation containing phosphogypsum in strong sulfuric acid; a portion of the anhydrite crystals containing the radioactive contamination is converted to substantially radiation free gypsum by crystallizing out on a large solids concentration of radiation free gypsum seed crystals; and coarse radiation free gypsum crystals are separated from small anhydrite crystal relics containing substantially all of the radioactive contamination.
Assignee:
United States Gypsum Co
Patent Number(s):
US 4388292
OSTI ID:
5963531
Country of Publication:
United States
Language:
English

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Related Subjects

510300* -- Environment
Terrestrial-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM SULFATES
CLEANING
CONTAMINATION
CRYSTALLIZATION
DECONTAMINATION
DEHYDRATION
GYPSUM
HYDRATES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MATERIALS
MINERALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RADIOACTIVE MATERIALS
SEPARATION PROCESSES
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
SULFURIC ACID