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A high-uranium phosphate rock from the Itataia deposit, located in the state of Ceará, Brazil, was milled in a pilot plant for wet-process phosphoric acid production. Further processing with solvent extraction (DEHPA/TOPO) was used aiming to recover uranium from the phosphoric acid. The distribution of natural radionuclides with long physical half-life of the  238 U and  232 Th decay series involved in these operations was evaluated. The radionuclides  226 Ra,  228 Ra and  210 Pb were found to predominate in the phosphogypsum, while  228 Th,  230 Th and  232 Th in the uranium-free phosphoric acid.

radiochimica acta

Distribution of natural radionuclides during the processing of phosphate rock from Itataia-Brazil for production of phosphoric acid and uranium concentrate