Natural radionuclide-free phosphoric acid production
作者： H. T. Fukuma , E. A. De Nadai Fernandes , A. L. Quinelato
关键词: Phosphoric acid 、 Radionuclide 、 Solvent extraction 、 Uranium 、 Nuclear chemistry 、 Thorium 、 Phosphate 、 Chemistry 、 Phosphorite 、 Phosphogypsum
摘要: High-uranium phosphate rock from Itataia, Brazil, was milled for wet-process phosphoric acid production using the dihydrate method. Uranium contained in recovered by solvent extraction. The distribution of long-lived natural radionuclides 238U and 232Th decay series involved these operations evaluated. 226Ra, 228Ra 210Pb were found to predominate phosphogypsum, while 228Th, 230Th uranium-free acid. Thorium is removed extraction produce a NORM-free
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