Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 324, Issue 3, Pages 1265-1273Publisher
SPRINGER
DOI: 10.1007/s10967-020-07154-0
Keywords
Uranyl phosphate; Meta-ankoleite; Precipitation; Wastewater treatment; SOHIO process
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [NRF-2017M2A8A5015147]
- National Research Foundation of Korea [2017M2A8A5015147] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Uranyl phosphate synthesis (MUO2PO4, M = Na+, K+, NH4+) by diffusion method, direct and pH-controlled precipitation has been performed and compared. Chemical and thermogravimetric analysis revealed compound stoichiometry to be in good agreement with ideal mineral phases (sodium uranyl phosphate (NaUO2PO4.xH(2)O), meta-ankoleite (KUO2PO4.3H(2)O) and uramphite ((NH4)UO2PO4.3H(2)O)) except for sodium and ammonium cations. Layered platelet-type crystal structures associated with uranyl phosphates were confirmed. Some long-range crystal structure was observed under direct precipitation conditions. No visible evidence of long-range crystal structures for samples formed during pH-controlled precipitation was found due to dilute formation conditions and rapid nucleation kinetics.
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