Authors:
H. Fukuma Comissão Nacional de Energia Nuclear - Laboratório de Poços de Caldas - CNEN/DILAB CP 913 37701-970 Poços de Caldas MG Brazil

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E. De Nadai Fernandes Universidade de São Paulo - CENA/USP Centro de Energia Nuclear na Agricultura CP 96 13400-970 Piracicaba SP Brazil

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A. Quinelato Comissão Nacional de Energia Nuclear - Laboratório de Poços de Caldas - CNEN/DILAB CP 913 37701-970 Poços de Caldas MG Brazil

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Abstract  

High-uranium phosphate rock from Itataia, Brazil, was milled for wet-process phosphoric acid production using the dihydrate method. Uranium contained in the phosphoric acid was recovered by solvent extraction. The distribution of long-lived natural radionuclides of the 238U and 232Th decay series involved in these operations was evaluated. 226Ra, 228Ra and 210Pb were found to predominate in the phosphogypsum, while 228Th, 230Th and 232Th in the uranium-free phosphoric acid. Thorium is removed from the phosphoric acid by solvent extraction to produce a NORM-free phosphoric acid.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)